Patent Application
20190195255
The present invention relates to an accessory attachment structure which attaches an accessory such as a support for supporting a long object, for example, piping, a duct, a cable tray and an electrical wire conductor to a steel plate-reinforced concrete structure (hereinafter, referred to as an SC structure) in which concrete is surrounded by a plurality of outside steel plates, a plurality of bars are disposed inside the concrete and also fixed on the outside steel plate.
The present invention also relates to a design system and a design method of an SC structure, a construction method of an SC structure and an SC structure.
The present application claims the right of priority to Japanese Patent Application No. 2010-213808 filed on Sep. 24, 2010, in Japan, Japanese Patent Application No. 2010-235468 filed on Oct. 20, 2010, in Japan, Japanese Patent Application No. 2010-280561 filed on Dec. 16, 2010, in Japan, Japanese Patent Application No. 2011-040004 filed on Feb. 25, 2011, in Japan, Japanese Patent Application No. 2011-040006 filed on Feb. 25, 2011, in Japan, Japanese Patent Application No. 2011-040007 filed on Feb. 25, 2011, in Japan, and Japanese Patent Application No. 2011-040009 filed on Feb. 25, 2011, in Japan, with the contents cited herewith.
A reinforced concrete structure (hereinafter, referred to as an RC structure) in which reinforcing steel is used as a tension member is known as a general concrete structure. In recent years, attention has been given to a steel plate-reinforced concrete structure which uses steel plates as the tension members, in addition to the RC structure.
The SC structure is described, for example, in Patent Document 1 and Patent Document 2. The SC structure includes a steel plate frame formed with a plurality of outside steel plates, a tie bar which connects a plurality of outside steel plates with each other, a stud fixed on an inner face of each outside steel plate, and concrete installed inside the steel plate frame.
The SC structure is advantageous over the RC structure in the following points of (1) to (3).
(1) Reduction in Construction Schedule
Outside steel plates used in the SC structure also function as a frame for installing concrete, thereby eliminating the need for reinforcement work and frame work as required in the RC structure. Therefore, site work is drastically reduced to shorten the construction schedule.
(2) Reduction of Adverse Effects on Environment
Since outside steel plates used in the SC structure also function as a frame and ultimately remain in the structure, thus eliminates the need for discarding the frame as required in the RC structure. Therefore, it is possible to reduce waste and lower adverse effects on the environment.
(3) Improvement in Attachment and Construction Properties of Accessory
In the RC structure, on attachment of an accessory such as a support for supporting piping to the RC structure, a bolt or the like is disposed at a predetermined attachment position of the accessory and concrete is thereafter installed. After the concrete is hardened, the accessory is connected to a part of the bolt which protrudes from a wall surface of the RC structure. In contrast, in the SC structure, an accessory can be directly joined on an outside steel plate by welding and others. Therefore, it is not necessary to determine in advance an attachment position of the accessory. Further, the accessory can be attached, irrespective of concrete hardening time. Thus, in the SC structure, it is possible to freely decide timing of attaching the accessory and an attachment position thereof and also improve the attachment and construction properties of the accessory.
Further, a general method for reinforcing an anchorage zone of an accessory includes a method for welding a reinforcing member consisting of a steel member at an appropriate site of the anchorage zone for reinforcement and a method for fixing a reinforcing member through bolt holes, as disclosed in Patent Document 2. Specifically, in Patent Document 2, a metal plate unit is formed in advance in which a duct for electrical wiring is attached inside one metal plate in a pair of metal plates disposed so as to be opposed to each other, and concrete is installed inside the metal plate unit. In this case, the pair of metal plates are connected with a tie bar installed therebetween. Further, a stud for reinforcement is installed so as to protrude on an inner face of the pair of the metal plates. This stud is embedded into the concrete, thereby preventing the metal plate from peeling off from the concrete.
Still further, for example, as shown in Patent Document 2 and Patent Document 3, the SC structure is constituted with a steel plate frame which is formed with a plurality of outside steel plates, a tie bar which connects a plurality of outside steel plates together, a stud which is fixedly installed on an inner face of each outside steel plate, and concrete which is installed inside the steel plate frame.
In designing the above-described SC structure, as a failure mode of a stud 902 embedded into concrete 901, evaluation is made for two types of failure mode, that is, cone failure which is carried out at an angle of 45° at the center of the stud shown in
[Formula 1]
F=ϕ×Ac×√{square root over (Fc)} (1)
As shown in the above-described formula (1), the load-bearing capacity of the stud 902 in cone failure depends on the projection area Ac. As shown in
As so far described, the SC structure is advantageous in having a high degree of freedom in terms of attachment of an accessory. However, depending on an attachment position of the accessory, a load applied to each one of the studs (and tie bar) will vary, by which it is necessary to decide the attachment position of the accessory so as to be in alignment with a position of the stud.
For example, as shown in
The present invention has been made in view of the above-described problems, a first object of which is to provide an accessory attachment structure which is capable of attaching an accessory to any given position even where an SC structure receives a great load of the accessory.
Further, in the SC structure, as described above, a load applied to each one of the studs or each one of the tie bars will vary depending on an attachment position of the accessory. It is therefore necessary to decide the attachment position of the accessory so as to be in alignment with a position of the stud or the tie bar.
However, since the stud 804 is disposed on an inner face 805a of the outside steel plate 805 (inner face of the steel plate frame 806) and also embedded into concrete 807, it is difficult to locate the position of the stud. Therefore, on attachment of the accessory 803, the position of the stud 804 needs to be confirmed by referring to a design drawing or the like, which requires time for construction. Time is also required in designing the attachment position of the accessory 803.
Therefore, the present invention has been made in view of the above-described problem, a second object of which is to provide an accessory attachment structure which makes it possible to easily decide an attachment position of an accessory.
Further, a third object of the present invention is to provide an accessory attachment structure which is increased in rigidity by a simple and lightweight structure and in which an accessory can be attached on confirmation of the strength of an attachment position of the accessory.
Still further, in a conventional method of designing the SC structure, as shown in
Therefore, a fourth object of the present invention is to provide a design system of an SC structure and a design method of an SC structure in which a stud can be rationally evaluated for load-bearing capacity thereof by reviewing a method for determining an effective projection area in cone failure for a conventional design method of an SC structure.
Further, a fifth object of the present invention is to provide an SC structure in which a stud can be rationally evaluated for the load-bearing capacity thereof, as compared with a case in which a plurality of studs are disposed so as to be arranged vertically and transversely (a case where they are arranged in a lattice form).
Still further, a sixth object of the present invention is to provide a construction method of an SC structure and an SC structure which are capable of attaching and constructing an accessory, with a load applied to each one of the studs reliably kept low, and also capable of shortening the time necessary for constructing the accessory and time necessary for designing an attachment position of the accessory, as compared with a conventional case.
In addition, in a conventional SC structure, a stud is joined to an inner face of an outside steel plate by fillet welding. Construction of the stud by welding partially contributes to an increase in construction man-hours and also an increase in construction costs.
Therefore, a seventh object of the present invention is to provide an SC structure which is capable of reducing man-hours on construction of a stud and construction costs and also capable of reducing the time necessary for constructing an accessory and time necessary for designing an attachment position of the accessory.
In order to attain the above-described first object, the accessory attachment structure of the present invention is an accessory attachment structure for attaching an accessory to an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a plurality of bars fixedly installed on an inner face of the outside steel plate, and concrete installed inside the steel plate frame. The accessory attachment structure is provided with an attachment plate in which one face thereof is attached to the outside steel plate and the accessory is attached to the other face thereof, the size of the other face of the attachment plate is larger than that of a whole attachment face to be attached to the attachment plate of the accessory, and the size of the one face of the attachment plate is equal to or greater than the other face. And, the length of the attachment plate in any direction along the one face of the attachment plate is at least two times greater than a mutual interval between the plurality of bars.
According to the present invention, on attachment of an attachment plate to any position of the outside steel plate, at least two bars are to be present in a region where the attachment plate is attached. Therefore, in the attachment structure, where the accessory is disposed at any position of the outside steel plate, tension load, etc., from the accessory can be received by two or more bars. In other words, it is possible to reduce a bearing load received by each one of the bars. Thus, according to the attachment structure, even where the SC structure receives a relatively great load of the accessory, it is possible to attach the accessory to any given position.
In the accessory attachment structure, it is acceptable that a plurality of the accessories be attached to the attachment plate and the size of the other face of the attachment plate be larger than that of attachment faces of each of the plurality of accessories where the plurality of accessories are attached to the attachment plate.
In this case, the attachment plate can be reduced in the number thereof in relation to a plurality of accessories and thereby man-hours on attachment can also be reduced. Further, in the attachment structure, the attachment plate can be further increased in area of one face per accessory, as compared with a case where the attachment plate is installed for each of the plurality of accessories. It is thus possible to further increase the load of the accessory received by the SC structure.
In the accessory attachment structure, it is acceptable that the accessory be provided with the plurality of attachment faces which are spaced apart from each other, and the size of the other face of the attachment plate be larger than that of the plurality of attachment faces of the accessory where the accessory is attached to the attachment plate.
In this case, as with the above-described attachment structure, it is possible to reduce the number of attachment plates in relation to a plurality of attachment faces of the accessory. Thereby, man-hours on attachment can be reduced. Further, in the attachment structure, the attachment plate can be increased in area of one face per attachment face of the accessory, as compared with a case where the attachment plate is installed for each of a plurality of attachment faces. It is therefore possible to increase the load of the accessory received by the SC structure.
In the above-described accessory attachment structure, it is acceptable that the attachment plate be gradually decreased in area of a cross-section perpendicular to a direction from the one face to the other face in moving along the direction. Further, in the accessory attachment structure, it is also acceptable that the attachment plate be provided with a plurality of plates which are stacked in a direction from the one face to the other face and also joined together, and the plurality of plates be such that a plate on the other face is smaller in area of a cross-section perpendicular to the above-described direction than a plate on the one face.
In this case, where the other face of the attachment plate is made smaller in area than the one face thereof, it is possible to reduce the weight of the attachment plate without reducing the load of the accessory received by the SC structure.
In the above-described accessory attachment structure, it is acceptable that the attachment plate be joined to the outside steel plate by welding.
In the attachment structure, the accessory can be attached to any given position on the outside steel plate without installing in advance a bolt or the like on the outside steel plate.
In order to attain the above-described second object, the accessory attachment structure of the present invention is an accessory attachment structure for attaching an accessory to an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, concrete installed inside the steel plate frame, and a plurality of tie bars passing through the outside steel plate and the concrete. The accessory attachment structure is provided with an attachment plate in which one face thereof is attached to an outer face of the outside steel plate and the accessory is attached to the other face thereof, and an external thread portion or an internal thread portion which is exposed on an outer face of the outside steel plate, and provided with the tie bar. The attachment plate is fastened and fixed to the outside steel plate by a nut or a bolt which is screwed into the external thread portion or the internal thread portion of at least one of the plurality of tie bars.
The present invention is a structure such that the attachment plate is directly fixed to the tie bar. Therefore, stress resulting from a load of the accessory can be applied to the tie bar via the attachment plate. Further, an end of the tie bar is exposed and the external thread portion which is screwed into a nut is installed at the end. And, the attachment plate can be attached to any given tie bar after visual observation is made for a site at which the tie bar is installed. Therefore, on attachment of the accessory, it is possible to easily decide an attachment position and also reduce a load received by each one of the tie bars.
The accessory attachment structure may be such that both ends of the tie bar are screwed into the outside steel plate and integrally joined to the attachment plate.
In this case, since a welding process is not required, it is possible to construct the SC structure easily.
In order to attain the above-described third object, the accessory attachment structure of the present invention is an accessory attachment structure in which a support member is attached via an attachment plate to the surface of an SC structure to which concrete is installed between a pair of outside steel plates opposed to each other at a predetermined interval. The pair of outside steel plates are connected only by a tie bar, the both ends of which are fixed to each of the outside steel plates, and the attachment plate is attached to a region to which at least a plurality of the tie bars are attached.
According to the present invention, the attachment plate of the support member can be attached after confirmation of the presence of the tie bar. It is therefore possible to easily disperse a load of the attachment plate to the plurality of tie bars substantially in a uniform manner.
The accessory attachment structure may be such that on the inner face of the outside steel plate, a rib extending along the inner face thereof is fixed.
In this case, unlike narrow and exact reinforcement by using a tie bar or a stud, a plurality of ribs are used to realize at least linear reinforcement. Thus, it is possible to efficiently disperse the load on installation of the attachment plate.
The accessory attachment structure may be such that an inner steel plate parallel to the outside steel plate is fixed to the leading end of the rib.
In this case, it is possible to secure a greater strength. In this case, it is preferable that consideration be given to positions of the inner steel plate so as to be along the rib in such a manner that concrete can be evenly installed between the outside steel plates without preventing the influx of ready-mixed concrete on installing the concrete.
The accessory attachment structure may be such that the rib arranges a plurality of flat plate members in a lattice form.
In this case, the flat plate members are arranged in a lattice form to constitute the rib, thus making it possible to improve the strength of the rib to a greater extent. Further, the rib is less likely to prevent the influx of ready-mixed concrete.
The accessory attachment structure may be such that the rib arranges a plurality of angle bars, each of which has an approximately L-shaped cross-section, in a lattice form.
In this case, one side of an approximately L-shaped cross-section is allowed to come into contact with the outside steel plate and be fixed. Thereby, the rib can be fixed to the outside steel plate simply and rigidly.
The accessory attachment structure may be such that the rib arranges a plurality of channel bars, each of which has an approximately C-shaped cross-section, in a lattice form.
In this case, one side of the channel bar is allowed to come into contact with the outside steel plate and be fixed. Thereby, the rib can be fixed to the outside steel plate simply and rigidly.
In order to attain the above-described fourth object, the design system of the SC structure of the present invention is a design system of an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a stud fixedly installed on an inner face of the outside steel plate, and concrete installed inside the steel plate frame. The design system of the SC structure is provided with a structure condition input device which inputs structure conditions including a stud interval and a stud length, a body load-calculating device which calculates a body load on the basis of the structure conditions input by the structure condition input device, a reference load-calculating device which calculates a reference load which can be supported by each one of the studs where supported by a plurality of studs as a whole, a load ratio-calculating device which calculates a load ratio of body load to reference load, a storage device which stores a relationship between the load ratio and an effective projection area, an effective projection area-calculating device which calculates the effective projection area from the load ratio by referring to a relationship between the load ratio and the effective projection area stored by the storage device, and an load-calculating device which calculates a load including an accessory load which can be supported by one stud on the basis of the effective projection area calculated by the effective projection area-calculating device.
The design method of the SC structure of the present invention is a design method of an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a stud fixedly installed on an inner face of the outside steel plate, and concrete installed inside the steel plate frame. The design method includes: calculating a body load which is determined on the basis of structure conditions including a stud interval and a stud length; calculating a reference load which can be supported by each one of the studs is determined where the load is supported by the plurality of studs as a whole; calculating a load ratio of body load to reference load which is determined; calculating an effective projection area which is determined from the load ratio by referring to a relationship between a predetermined load ratio and the effective projection area; and calculating a load including an accessory load which can be supported by each one of the studs is determined on the basis of the thus determined effective projection area.
In order to attain the above-described fifth object, the SC structure of the present invention is an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a plurality of studs fixedly installed on an inner face of the outside steel plate and concrete installed inside the steel plate frame, in which the plurality of studs are arranged in a zigzag form.
In order to attain the above-described sixth object, the construction method of the SC structure of the present invention is a construction method of an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a stud installed in a protruded manner from an inner face of the outside steel plate to the inside of the steel plate frame, concrete installed inside the steel plate frame, and an attachment device installed on an outer face of the outside steel plate to attach an accessory. The construction method includes: a stud-attaching step in which fixedly installed the stud on the inner face of the outside steel plate; an attachment device-preparing step in which disposed at least apart of the attachment device at a plurality of attachment positions on the outer face of the outside steel plate to which the accessory is attached via the attachment device; a steel plate-installing step in which disposed the outside steel plate at a predetermined position to form the steel plate frame; a concrete-installing step in which installed concrete into the steel plate frame; and an accessory-installing step in which installed the accessory.
According to the present invention, in the attachment device-preparing step, at least a part of the attachment device is disposed at a plurality of attachment positions on the outer face of the outside steel plate to which an accessory can be attached. It is therefore possible to easily confirm a position of the stud and dispose at least a part of the attachment device. Next, in the accessory-installing step, the accessory is attached and installed on the attachment device, by which the accessory can be attached and constructed in a state that a load received by each one of the studs is reliably kept low.
The SC structure of the present invention is an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a stud installed in a protruded manner from an inner face of the outside steel plate to the inside of the steel plate frame, concrete installed inside the steel plate frame, and an attachment device which is installed on an outer face of the outside steel plate to attach the accessory. The attachment device is provided with an attachment plate which attaches and supports the accessory and a locking portion which is installed at a plurality of attachment positions on an outer face of the outside steel plate to which the accessory can be attached. And, the attachment device is constituted in such a manner that the attachment plate can be selectively locked to any of the locking portions installed at the attachment positions and be fixed accordingly.
According to the present invention, since the attachment plate is selectively locked to any of the locking portions installed at a plurality of attachment positions on the outer face of the outside steel plate to which an accessory can be attached, it is possible to attach the accessory via the attachment plate to the outer face of the outside steel plate. Accordingly, a simple operation is employed in which a plurality of attachment positions are set so as to keep low a load received by each one of the studs and the attachment plate is locked to the locking portion of the attachment device installed at the attachment position, thereby reliably attaching and constructing the accessory in a state that the load received by each one of the studs is kept low. Further, at this time, a main body thereof can be selectively locked to any of the plurality of locking portions. It is therefore possible to attach the attachment plate and also the accessory to any given attachment position.
In order to attain the above-described seventh object, the SC structure of the present invention is an SC structure which is provided with a steel plate frame formed with a plurality of outside steel plates, a stud which is fixed to the outside steel plate and installed in a protruded manner to the inside of the steel plate frame, and concrete installed inside the steel plate frame, in which a through-hole is formed on the outside steel plate so as to pass through from the inner face of the outside steel plate to the outer face, a shaft portion of the stud is inserted to the through-hole, and the stud is fixed to the outside steel plate so that the outside steel plate is held between a pair of holding portions integrally formed on the shaft portion.
According to the accessory attachment structure of the present invention, it is possible to reduce a load received by each one of the bars. Thus, the accessory can be attached to any given position even where a load of the accessory received by the SC structure is relatively great.
Further, according to the accessory attachment structure of the present invention, stress resulting from a load of the accessory is allowed to act on a tie bar via the attachment plate. Still further, according to the accessory attachment structure of the present invention, it is possible to easily decide an attachment position on attachment of the accessory and also reduce a load received by each one of the tie bars.
Further, according to the accessory attachment structure of the present invention, it is possible to increase rigidity by a simple and lightweight structure and also attach an accessory after confirmation is made for the strength of an attachment position of the accessory.
According to the design system of the SC structure and the design method of the SC structure of the present invention, a stud can be rationally evaluated for load-bearing capacity thereof by reviewing a method for determining an effective projection area in cone failure for a conventional design method of an SC structure.
According to the SC structure of the present invention, a plurality of studs are disposed so as to be arranged in a zigzag form, thus making it possible to evaluate each stud as an individually independent stud. Further, according to the SC structure of the present invention, the stud can be evaluated rationally for load-bearing capacity thereof, as compared with a case where a plurality of studs are disposed so as to be arranged vertically and transversely (arranged in a lattice form).
According to the construction method of the SC structure and the SC structure of the present invention, a plurality of attachment positions are set so as to keep low a load received by each one of the studs, while a position of the stud is confirmed easily, and an accessory can be attached to the attachment position. Thereby, the accessory can be attached and constructed, with a load received by each one of the studs reliably kept low. It is also possible to reduce the time necessary for constructing the accessory and time necessary for designing an attachment position of the accessory, as compared with a conventional case.
According to the SC structure of the present invention, of the pair of holding portions, one of them is disposed on an outer face of the outside steel plate. Therefore, on attachment of an accessory, a position of the stud can be located from outside of the outside steel plate. Thereby, it is possible to reduce the time necessary for constructing the accessory and time necessary for designing an attachment position of the accessory.
Further, the stud is attached to the outside steel plate by using a rivet structure, a bolt and a nut, by which man-hours for constructing the stud can be reduced to attain reduction of construction costs, as compared with a case where the stud is fixed to the outside steel plate by a conventional welding.
Hereinafter, a description will be given of individual embodiments of the accessory attachment structure of the present invention by referring to drawings.
First, a description will be given of an accessory and an SC structure (steel plate-reinforced concrete structure) to which the accessory is attached, prior to a description of an accessory attachment structure.
As shown in
As shown in
Here, for convenience of the following description, of the pair of outside steel plates 11, a direction from the one outside steel plate 11 to the other outside steel plate 11 is given as the Z direction, a direction perpendicular to the Z direction is given as the Y direction, a direction perpendicular to the Z direction and the Y direction is given as the X direction. The pair of outside steel plates 11 are parallel to an XY plane.
In the SC structure 10, a mutual interval Ps between two studs 14 adjacent both in the X direction and the Y direction is, for example, 200 mm. A mutual interval Pt between two tie bars 13 adjacent both in the X direction and the Y direction is, for example, 600 mm. A mutual interval Pst between the stud 14 and the tie bar 13 adjacent both in the X direction and the Y direction is, for example, 200 mm. That is, in this SC structure 10, a mutual interval P between the bars 12 in the X direction and the Y direction is 200 mm.
Next, a description will be given of an accessory attachment structure of a First Embodiment of the present invention by referring to
An attachment plate 30 is used when the piping support 20, which is an accessory, is attached to the surface of an SC structure 10, that is, an outer face 11a of an outside steel plate 11. The attachment plate 30 is formed, for example, with a single steel plate such as an SS (steel structure) material and an SM (steel marine) material.
The attachment plate 30 is a rectangular-shaped plate, that is, 200 mm in length of the transverse direction that is equal to a mutual interval between studs and 400 mm in length of the longitudinal direction that is twice as long as the mutual interval between studs. The attachment plate 30 is such that, with the longitudinal direction kept in alignment with the Y direction, one face thereof (hereinafter, referred to as steel plate joint face 32) is attached to the outer face 11a of the outside steel plate 11 of the SC structure 10. Further, the piping support 20, which is an accessory, is attached to the other face of the attachment plate 30 (hereinafter, referred to as accessory joint face 31).
On attachment of the piping support 20, first, the attachment plate 30 is joined to the piping support 20 by welding. Specifically, the accessory joint face 31 of the attachment plate 30 is allowed to come into contact with an attachment face 21 which is a face on the attachment plate 30 of the piping support 20, by which a border portion between these faces 31 and 21 is joined together by welding. Connection of the attachment plate 30 with the piping support 20 may include any form of connection such as connection by welding, soldering and connecting fittings such as screws. As described previously, the piping support 20 is an H-steel member of 100 (H)×100 (B) mm, while the attachment plate 30 is a single steel plate (400×200 mm). Thus, there is no chance that the attachment face 21 of the piping support 20 will run off from the accessory joint face 31 of the attachment plate 30.
Next, the attachment plate 30 to which the piping support 20 has been joined is joined to the outside steel plate 11 of the SC structure 10 by welding. In this case, the attachment plate 30 is disposed on the outside steel plate 11 of the SC structure 10 in such a manner that the piping support 20 which has been joined to the attachment plate 30 assumes an intended position on an XY plane by making the longitudinal direction of the attachment plate 30 in alignment with the Y direction. Next, in a state that the steel plate joint face 32 of the attachment plate 30 is in contact with the outer face 11a of the outside steel plate 11, an outer-circumference edge of the steel plate joint face 32 of the attachment plate 30 is joined to the outside steel plate 11 by welding. In addition, connection of the attachment plate 30 with the outside steel plate 11 may be carried out by welding or soldering.
The attachment plate 30 is a steel plate with sizes 400 mm×200 mm and a maximum length thereof (400 mm) is twice as long as a mutual interval P (200 mm) of bars 12 of the SC structure 10. Therefore, if the attachment plate 30 is attached to any position on the outer face 11a of the outside steel plate 11, at least two bars 12 are present in a region where the attachment plate 30 has been attached.
The piping support 20 is attached, for example, at the center of the attachment plate 30 (at the center in the X direction and the Y direction). As shown in the case of a in
Further, as shown in the case of b in
Still further, as shown in the case of c in
That is, in the present embodiment, even where the attachment plate 30 is attached to any position of the outside steel plate 11, at least two bars 12 are present in a region of the attachment plate 30 in the X direction and the Y direction. Therefore, in the present embodiment, where the piping support 20 is disposed at any position on the outside steel plate 11, it is possible to receive tension load, etc., from the piping support 20 by two or more bars 12. In other words, it is possible to reduce a load received by each one of the bars 12.
Therefore, in the present embodiment, the piping support 20 can be attached to any given position, even where the SC structure 10 receives a relatively great load from the piping support 20.
Next, a description will be given of a Second Embodiment of an accessory attachment structure of the present invention by referring to
The attachment structure of the First Embodiment is an attachment structure which is the piping support 20 with one leg. The attachment structure of the present embodiment is an attachment structure which is a piping support 22 with a plurality of legs.
Specifically, the piping support 22 of the present embodiment is provided with a beam 22a which directly supports a piping 25 and a reinforcing member 22b which supports the beam 22a. The beam 22a is installed so as to run along the Z direction. The reinforcing member 22b is joined to one end of the beam 22a and installed obliquely relative to the beam 22a from there, that is, so as to run along the YZ directions. The beam 22a and the reinforcing member 22b constitute respectively the legs of the piping support 22. Therefore, the attachment face which is a face on the attachment plate 30 of the piping support 22 is given as a face 21a at the other end of the beam 22a and also a face 21b at the other end of the reinforcing member 22b.
The attachment plate 30 of the present embodiment is made to a size such that on attachment of the piping support 22, these two attachment faces 21a, 21b of the piping support 22 are both placed inside an accessory joint face 31 of the attachment plate 30, specifically, the sizes of 400 mm×200 mm. The attachment plate 30 of the present embodiment is equal in sizes (400 mm×200 mm) to the attachment plate 30 of the First Embodiment to which the piping support 20 with one leg is attached. However, where a distance between the respective attachment faces 21a and 21b of the beam 22a and the reinforcing member 22b which constitute the piping support 22 is relatively great, it is necessary to make the attachment plate 30 greater in sizes so that the two attachment faces 21a and 21b are both placed inside the accessory joint face 31 of the attachment plate 30.
As described so far, in the present embodiment as well, as with the First Embodiment, the attachment plate 30 is a steel plate with sizes of 400 mm×200 mm and a maximum length (400 mm) is twice as long as a mutual interval (200 mm) between bars 12 of the SC structure 10. It is therefore possible to attach the piping support 22 to any given position even where a load of the piping support 22 received by the SC structure 10 is relatively great.
Next, a description will be given of a Third Embodiment of an accessory attachment structure of the present invention by referring to
The present embodiment relates to a plurality of accessory attachment structures, and the plurality of accessories are all piping supports 22 as with the Second Embodiment.
Two piping supports 22 are attached to an attachment plate 33 of the present embodiment. A mutual interval dy in the Y direction between an attachment face 21a of a beam 22a of one piping support 22 and an attachment face 21a of the other piping support 22 is 450 mm, and a mutual interval dx in the X direction is 400 mm. Therefore, the attachment plate 33 of the present embodiment is made to a size such that on attachment of these two piping supports 22, the attachment faces 21a, 21b of every two piping supports 22 are both placed inside an accessory, joint face 31 of the attachment plate 33, specifically, the sizes of 900 mm×650 mm.
As described so far, in the present embodiment, a steel plate joint face 32 (900 mm×650 mm) of the attachment plate 33 to which two piping supports 22 are attached is at least two times greater in area than a steel plate joint face 32 (400 mm×200 mm) of the attachment plate 30 to which one piping support 22 is attached. That is, the steel plate joint face 32 is greater in area than a case where one piping support 22 is attached. It is therefore possible to increase a load of the piping support 22 received by an SC structure 10. Further, in the present embodiment, two piping supports 22 can be attached to the SC structure 10 by using one attachment plate 33 on attachment of two piping supports 22, thus making it possible to reduce man-hours necessary for attachment work.
Incidentally, in the present embodiment, connection of the attachment plate 33 with the outside steel plate 11 is made, as with the embodiments so far described, by joining an outer-circumference edge of the steel plate joint face 32 of the attachment plate 33 to the outside steel plate 11 by welding. However, where the attachment plate 33 is relatively great in size as found in the present embodiment, it is preferable that, as shown in
Next, a description will be given of various modified examples of the embodiments so far described.
The attachment plates 30, 33 of the so far-described individual embodiments are both formed in a rectangular shape steel plate, to which the present invention shall not be, however, restricted and is fundamentally applicable to any shape. For example, as shown in
In the so far-described individual embodiments, the accessory joint face 31 of the attachment plates 30, 33 is equal in area to the steel plate joint face 32. However, the attachment plate of the present invention may be made to a size such that an attachment face of a piping support as a whole can be placed inside the accessory joint face and the length of the steel plate joint face in any of the directions along the steel plate joint face is at least two times greater than a mutual interval between bars 12. Therefore, the accessory joint face may be smaller in area than the steel plate joint face.
For example, as shown in
Further, as shown in
As shown in
As described so far, when the accessory joint face 31 is made smaller in area than the steel plate joint face 32, the attachment plates 38, 40, 45 can be reduced in weight without decreasing a load of the piping support 20 received by the SC structure 10. Therefore, where the accessory joint face 31 is made smaller in area than the steel plate joint face, it is preferable that an interval between the accessory joint face 31 and the steel plate joint face 32 be kept to a greater extent than a predetermined extent for the purpose of ensuring the strength against the load of the piping support 20 received by the attachment plates 38, 40, 45.
In each of the so far-described embodiments and modified examples, a steel plate is used as the attachment plate, to which the present invention shall not be, however, restricted. Various types of plates such as a SUS plate may be used in the present invention.
Further, in these embodiments and modified examples, the piping support is joined to an attachment plate and the attachment plate is then joined to the outside steel plate 11. It is, however, acceptable that an attachment plate be joined to the outside steel plate 11 and the piping support be then joined to the attachment plate.
Hereinafter, a description will be given of an accessory attachment structure of a Fourth Embodiment in the present invention by referring to drawings.
Prior to a description of the accessory attachment structure, a description will be first given of an accessory and an SC structure (steel plate-reinforced concrete structure) 201 to which the accessory is attached.
As shown in
Here, as a matter of convenience in giving the following description, in a pair of outside steel plates 202, a right-hand direction in
In the SC structure 201, a mutual interval Ps between two studs 206 adjacent both in the X direction and the Y direction is, for example, 200 mm. Further, a mutual interval Pt between two tie bars 205 adjacent both in the X direction and the Y direction is, for example, 600 mm. Still further, a mutual interval Pst between a stud 206 and a tie bar 205 adjacent both in the X direction and the Y direction is, for example, 200 mm. That is, in the SC structure 201, a mutual interval P between bars 203 in the X direction and the Y direction is 200 mm.
One end of each stud 206 is fixed to an inner face of the outside steel plate 202. The other end of each stud 206 is joined to a cylindrical head 206a so as to be steadily fixed to the concrete 204 in an improved manner.
Each tie bar 205 passes through the concrete 204 and the outside steel plate 202, and both ends thereof protrude from an outer face of the outside steel plate 202 by a predetermined length. That is, the tie bar 205 is longer than the thickness of the SC structure 201. The protruded length is decided depending on the thickness of an attachment plate 209 to be described later and the thickness of a nut 211 for fixing the attachment plate 209 and set so as to be at least longer than a sum of these thicknesses.
As shown in
An external thread portion 220 is formed on an outer circumference of a protrusion 205a at both ends of each tie bar 205. A pitch of the external thread portion 220 is in agreement with a pitch of the nut 211 to be described later.
Next, a description will be given of an attachment structure of a piping support 208 in association with the above-described SC structure 201.
The piping support 208 is formed with two H-steel members. The H-steel member has sizes of, for example, 100 mm (H)×100 mm (B). In addition, in the present invention, an accessory is not necessarily a piping support and may include fundamentally anything such as a support of ducts and a rack.
The piping support 208 is attached to the outside steel plate 202 of the SC structure 201 via an attachment plate 209. The attachment plate 209 is formed, for example, with a single steel plate such as an SS (steel structure) material and an SM (steel marine) material.
The attachment plate 209 is a rectangular plate-like member when viewed from above. One side of the attachment plate 209 is, for example, 280 mm in length. An attachment hole 210 is formed at each of the four corners of the attachment plate 209. The attachment holes 210 are passed by each of four protrusions 205a which are positioned so as to correspond thereto.
The piping support 208, which is an accessory, is attached to the surface of the attachment plate 209 (hereinafter, referred to as accessory joint face 209a). The piping support 208 is provided with a beam 208a which directly supports a piping 225 and a reinforcing member 208b which reinforces the beam 208a. The beam 208a is joined, for example, by welding in such a manner that the longitudinal direction thereof is orthogonal to the accessory joint face 209a of the attachment plate 209. In addition, the beam 208a is joined to the accessory joint face 209a in such a manner that flanges (edges) of the beam 208a are positioned above and below. The reinforcing member 208b is joined so as to extend obliquely downward from a free-end lower face of the beam 208a joined to the attachment plate 209 toward the accessory joint face 209a of the attachment plate. Further, connection of the attachment plate 209 with the piping support 208 may be made in any form, for example, by welding, soldering or using connecting fittings such as screws.
The attachment plate 209 to which the piping support 208 is joined is attached by inserting the protrusions 205a of the tie bars 205 respectively into the four attachment holes 210. Thereby, a back face of the attachment plate 209 (hereinafter, referred to as a steel plate joint face 9b) is allowed to come into contact with the outer face of the outside steel plate 202 of the SC structure 201. Further, a nut 211 is fastened to an external thread portion of the protrusion 205, by which the attachment plate 209 is fixed.
In the above embodiment, an end of the tie bar 205 is exposed, and an external thread portion 220 which is screwed into a nut is formed at this end. Therefore, it is possible to attach the attachment plate 209 to any given tie bar 205 after visual observation is made for a site at which the tie bar 205 is installed. Further, in terms of structure, the attachment plate 209 is directly fixed to the tie bar 205. Therefore, stress resulting from a load of the piping support 208 is allowed to act on four tie bars 205 via the attachment plate 209. It is thereby possible to reduce a load received by each one of the tie bars 205.
Still further, the tie bar 205 protrudes from the outer face of the outside steel plate 202. Therefore, in a step of fixing the attachment plate 209 to the SC structure 201, an attachment plate 1 may be hooked to the protrusion 205a and retained temporarily. Thereby, fixing work is done more easily.
In the present embodiment, the attachment plate 209 can be attached to both sides of the SC structure 201, to which the present invention shall not be, however, restricted. The attachment plate 209 may be attached to only one side of the SC structure 201.
Next, a description will be given of an accessory attachment structure of a Fifth Embodiment of the present invention by referring to
As shown in
As for the tie bar 205A and outside steel plate 202, the tie bar 205A is inserted into a tie bar hole 207 in such a manner that the end face 205Aa of the tie bar 205A is disposed to be substantially flush with the outer face of the outside steel plate 202, and an inner face of the outside steel plate 202 is welded to an outer circumferential face of the tie bar 205A to fix them. Thereby, the internal thread hole 214 formed at the end face 205Aa of the tie bar 205A is fixed in a state of being exposed on the outer face of the outside steel plate 202.
An attachment hole 210A of an attachment plate 209A to which a piping support 208 is attached has an inner diameter which allows the bolt 212 to pass therethrough. The attachment hole 210A is, as with the Fourth Embodiment, formed at a position corresponding to each of the four tie bars adjacent to each other. The attachment plate 209A is fixed to an SC structure 210A by screwing four bolts 212 into the internal thread holes 214 and fastening the bolts.
In the above-described embodiment, the end 205Aa of the tie bar 205A is exposed on the outer face of the outside steel plate 202 and the internal thread hole 214 which is screwed with the bolt 212 is formed at the end 205Aa. It is therefore possible to attach the attachment plate 209A to any given tie bar 205A after a site at which the tie bar 205A is installed is visually observed.
Further, in terms of the structure, the attachment plate 209A is directly attached to the tie bar 205A. Therefore, stress derived from a load of the piping support 208 is allowed to act on the four tie bars 205A via the attachment plate 209A.
Still further, the tie bar 205A does not protrude on the outside steel plate 202. As a result, where the attachment plate 209A is not fixed, the SC structure 201A has a smoother exposed face.
Further, in the present embodiment, the end face 205Aa is substantially flush with the outer face of the outside steel plate 202, to which the present invention shall not be, however, restricted. The end face 205Aa may be positioned inside the outer face of the outside steel plate 202. Further, a hole may only be formed which can place a protruded part of the tie bar on the attachment plate 209A, even if the end face 205Aa is positioned outside the outer face of the outside steel plate 202.
Next, a description will be given of an accessory attachment structure of a Sixth Embodiment of the present invention by referring to
As shown in
The integrally formed tie bar 205B has a length which is substantially equal to the thickness of an SC structure 201B.
As shown in
The tie bar 205B is fixed to the outside steel plate 202 by screwing the bolt 218 into the internal thread hole 217 of the tie bar-fixing portion 216 in a state that the end face 216a of the tie bar-fixing portion 216 is allowed to come into contact with an inner face of an outside steel plate 202B. That is, unlike the accessory attachment structure of the Fourth Embodiment or Fifth Embodiment, the tie bar 205B is not welded to the outside steel plate 202. Thereby, the internal thread hole 217 formed at the end face 216a of the tie bar-fixing portion 216 is exposed on an outer face of the outside steel plate 202B via the tie bar hole 207B.
On attachment of the attachment plate 209B to the outside steel plate 202B, the bolt 218 which fixes the tie bar 205B corresponding to a position at which the attachment plate 209B is attached is temporarily removed. And, the attachment plate 209B is disposed on the outside steel plate 202 and again fastened and fixed by means of the bolt 218. That is, the attachment plate 209B is placed between the outside steel plate 202 and the bolt 218 and then fixed.
In the above-described embodiment, with regard to the tie bar 205B, the outside steel plate 202 and the attachment plate 209B, the bolt 218 is screwed into the internal thread hole 217 of the tie bar 205B to fasten the outside steel plate 202 or fasten the outside steel plate 202 with the attachment plate 209B. This will eliminate the need for a welding process, by which an SC structure can be constructed more easily. Further, concrete 204 different in thickness can be handled freely only by changing the length of the tie bar main body 215 of the tie bar 205B.
Further, in this embodiment, a description has been given of a case where the bolt 218 is used to fasten and fix the outside steel plate 202 and the attachment plate 209B. However, in place of forming the internal thread hole 217 at the tie bar-fixing portion 216, a method may be used in which a pilot hole of a tapping bolt is provided to fasten and fix them by means of the tapping bolt. This method is applied to at least one side of the tie bar-fixing portion, which will not affect the positional accuracy or others of the tie bar hole 207B of the outside steel plate 202.
Further, the tie bar main body 215 may be integrally formed with the tie bar-fixing portion 216.
Next, a description will be given of the Seventh Embodiment of the invention by referring to
This embodiment is similar to the Sixth Embodiment in basic structure in which the tie bar is fastened and fixed to the outside steel plate 202 and the attachment plate 209 by using the bolt 218. Therefore, in the following description, the same reference numerals are given to the same parts, with a description thereof omitted. Further, although
The tie bar 205C of the present embodiment is constituted with a tie bar main body 215C and a pair of tie bar-fixing portions 216C, 216C which are screwed into the both ends of the tie bar main body 215C. An external thread is formed at both ends of the tie bar main body 215C. An internal thread hole corresponding to the external thread of the tie bar main body 215C is formed at each of the tie bar-fixing portions 216. They are screwed thereinto to give an integrally formed tie bar 205C.
According to the above-described embodiment, the tie bar 2050 is integrally formed by screwing the tie bar main body 215C into the tie bar-fixing portion 216. This will eliminate the need for a process such as welding, thus making it possible to change the length of the tie bar main body 215C more easily.
Next, a description will be given of modified examples of the Fourth Embodiment to Seventh Embodiment so far described.
In the individual embodiments so far described, a description has been given of a case where the correspondingly-shaped attachment plates 209, 209A and 209B are attached to the mutually-adjacent four tie bars 205, 205A and 205B. The present invention shall not be, however, restricted thereto. The attachment plate may be changed in size according to the size and others of an accessory. In addition to a regular tetragonal attachment plate, a rectangular attachment plate may be attached to each of the six tie bars 205 made up of two upper and lower stages, each containing three tie bars. Alternatively, a rectangular attachment plate with two attachment holes may be attached to two tie bars 205 which are mutually adjacent.
In addition, in the embodiments and modified examples so far described, after the piping support 208 is joined to the attachment plate 209, the attachment plate is joined to the outside steel plate 202. However, after the attachment plate 209 is joined to the outside steel plate 202, the piping support 208 may be joined to the attachment plate 209.
Hereinafter, a description will be given of an accessory attachment structure of an Eighth Embodiment of the present invention by referring to drawings.
As shown in
The SC structure 311 is provided such that concrete 314 is installed between a pair of outside steel plates 312, 313 which are opposed to each other at a certain interval. Further, the pair of outside steel plates 312, 313 are connected by means of a tie bar 315, both ends of which are fixed by welding to an inner face of each of the outside steel plates 312, 313.
The tie bar 315 connects the outside steel plates 312, 313, thereby keeping an interval thereof constant, irrespective of the load received from the concrete 314. The tie bars 315 are disposed vertically and transversely on the outside steel plates 312, 313, with a constant interval kept. In the present embodiment, as shown in
For example, plug welding is done to fix a head of the tie bar 315 to the outside steel plate 313. Specifically, after the headed tie bar 315 is melted and settled on one outside steel plate 312 by stud welding, the other outside steel plate 313 on which a hole 313a for plug welding has been formed in advance is placed on the headed tie bar 315 and a leading end of a stud as a welding material is fused by arc stud welding to fill the hole 313a. There is no particular restriction on a method for connecting the tie bars 315. Any method will do as long as the head of the tie bar 315 is visible (does not protrude) at least on the surface of the outside steel plate 313 to which the support member 322 is attached.
On construction of the SC structure 311, as shown in
Next, the concrete 314 is installed between the outside steel plates 312, 313 and the concrete 314 is hardened to complete the SC structure 311. In addition, the SC structure 311 is constructed mainly as an external wall, a partition wall, a floor slab (foundation slab) and the like of a building. In general, subsequently attached members such as long objects including various types of machines in a building (hereinafter, a description will be given by referring to a duct 321) are installed in a state of being supported by support members (accessories) 322.
An attachment plate 323 is attached to the surface of each of the outside steel plates 312, 313 in a region, the back side of which is provided at least with a plurality of tie bars 315. Here, the tie bars 315 are disposed vertically and transversely at constant intervals in a state that a leading end of each tie bar 315 is exposed on the surface of the outside steel plate 313. Further, where the attachment plate 323 is mounted on a plurality of tie bars 315, the tie bars 315 can be fixed by welding at positions where the load is taken into account.
The duct 321 is placed for the purpose of evacuation of air at a control room of plant facilities or the like. The duct 321 is extended along the surface of the outside steel plate 313 in a state of being supported by support members 322. The duct 321 is a round duct, the cross-section of which is circular, and used is a cylindrical duct made with a relatively thin steel plate. There is no restriction on types of long objects, including, for example, a rectangular duct.
The support member 322 is made with an H-steel member and fixed to the SC structure 311 via the attachment plate 323. Specifically, the support member 322 is composed of a beam 324 for supporting the duct 321 and a reinforcing member 325 for supporting the beam 324. The support member 322 may include an L-steel member and a channel bar in addition to the H-steel member.
The attachment plate 323 is a steel plate, the shape of which is rectangular, when viewed from above. The attachment plate 323 is provided such that each side thereof is fixed to the surface of the outside steel plate 313 by welding. The attachment plate 323 is attached to a region where at least a plurality of tie bars 315 is attached. That is, the attachment plate 323 is attached to a region, the back side of outside steel plate 313 is provided with a plurality of tie bars 315. In the present embodiment, as shown in
As described so far, the pair of steel plates 312, 313 are connected only by the tie bars 315. Therefore, loads of the attachment plate 323, the H-steel members 324, 325 and the duct 321 are not supported only by the outside steel plate 313 but also supported by the outside steel plate 312 and the concrete 314 via individual tie bar 315.
Thereby, as compared with a case where loads of the duct 321 and others are shared by studs (not illustrated) installed on the outside steel plates 312, 313, defects and others are less likely to occur at individual portions which constitute the SC structure 311, thus making it possible to improve the strength of the SC structure 311 as a whole. It is therefore possible to attach the support member 322 to the outside steel plate 313 at any position without restriction.
As described so far, in the accessory attachment structure 310A of the present invention, the attachment plate 323 can be fixed by welding on the basis of the tie bars 315, the heads of which are exposed on the surface. Therefore, the load of the duct 321 can be dispersed in a substantially uniform manner to the tie bars 315.
Further, since heads of the tie bars 315 are exposed, in doing work for attaching the attachment plate 323 to the outside steel plate 313, the work can be done, with confirmation made for positions of the tie bars 315. It is therefore possible to perform construction in a shorter time.
As shown in
The rib 316 is provided such that a plurality of long- and thin-rectangular flat plate members are assembled in a lattice form. The ribs 316 are individually fixed so as to extend all over the inner faces of outside steel plates 312, 313. Further, the inner steel plate 317 is fixed to a leading end of the rib 316 (that is, an end opposite to the outside steel plate 312 or 313) and disposed substantially parallel to the outside steel plates 312, 313.
According to the accessory attachment structure 310B of the present ninth embodiment, the rib 316 and the inner steel plate 317 are fixed to the inner faces of the outside steel plates 312, 313, by which the outside steel plates 312, 313 can be increased in rigidity. Thereby, as compared with the Eighth Embodiment, it is possible to further improve the strength of an SC structure 311 as a whole.
It is preferable that consideration be given to positions of the rib 316 and the inner steel plate 317 so that on installing concrete 314, the concrete 314 can be installed evenly between the outside steel plates without preventing the influx of ready-mixed concrete. With the same purpose, a hole for the influx of ready-mixed concrete or the like may be formed on the rib 316 and the inner face steel plate 317.
As shown in
The rib 318 is provided such that a plurality of angle bars, each of which has an L-shape cross-section, are assembled in a lattice form, and the ribs are fixed individually so as to extend all over the inner faces of the outside steel plates 312, 313. Further, as with the Ninth Embodiment, an inner steel plate 317 is installed which is fixed to the leading end of the rib 318 and disposed substantially parallel to the outside steel plates 312, 313. The rib 318 is assembled in a lattice form by stacking a plurality of angle bars extending in the longitudinal direction and a plurality of angle bars extending in the transverse direction in upper and lower two stages.
According to the accessory attachment structure 310C of the present tenth embodiment, it is possible to further ensure the strength thereof by using the L-shaped rib 318 in place of the rib 316. It is desirable that the rib 318 which extends horizontally (transversely) face upward for facilitating the influx of ready-mixed concrete. It is also desirable that a rib 318 which extends longitudinally be first installed on the back face of each of the outside steel plates 312, 313 and a rib 318 which extends transversely be then disposed so as to be overlaid on the above-described rib 318 (or via the inner face steel plate 317) in view of facilitating the influx of ready-mixed concrete. Further, it is preferable that the edge of the rib 318 toward the other side of each of the outside steel plates 312, 313 (thickness direction) be overlaid on the tie bar 315. Still further, in the illustrated example, the inner steel plate 317 is installed on a rib 318 which extends transversely. The inner steel plate 317 may be installed between a rib 318 which extends longitudinally and a rib 318 which extends transversely or may be installed on both of them (two inner steel plates). In addition, according to the present embodiment, one edge of an angle bar having an L-shaped cross-section is allowed to come into contact with the outside steel plates 312, 313 and be fixed. Therefore, the present embodiment is advantageous over the rib 316 of the Ninth Embodiment in that the rib 318 can be more simply and more rigidly fixed to the outside steel plates 312, 313.
As shown in
The rib 319 is provided such that a plurality of C-shaped channel bars, each of which has a C-shaped cross-section, are assembled in a lattice form. The ribs 319 are individually fixed so as to extend all over the inner faces of the outside steel plates 312, 313. Further, as with the Ninth Embodiment, an inner steel plate 317 is fixed to the leading end of the rib 319 and disposed substantially parallel to the outside steel plates 312, 313. In addition, the rib 319 is formed in a lattice form by stacking a plurality of angle bars extending longitudinally and a plurality of angle bars extending transversely in upper and lower two stages.
According to the accessory attachment structure 310D of the present eleventh embodiment, it is possible to further ensure the strength of the structure by using the C-shaped rib 319 in place of the ribs 316, 318. In order to facilitate the influx of ready-mixed concrete, it is desirable that a rib 319 extending horizontally (transversely) face its opening side toward a rib 319 extending longitudinally. It is also desirable that a rib 319 extending longitudinally be first installed on the back face of each of the outside steel plates 312, 313 and a rib 319 extending transversely be then disposed so as to be overlaid on the above-described rib 319 in view of facilitating the influx of ready-mixed concrete. In addition, the inner steel plate 317 is not installed on the opening side of the rib 319 extending transversely. Further, in the present embodiment, one edge of the channel bar having a C-shaped cross-section is allowed to come into contact with the outside steel plates 312, 313 and be fixed. Therefore, as with the Tenth Embodiment, the present embodiment is advantageous in fixing the rib 319 to the outside steel plates 312, 313 more simply and more rigidly.
A description has been so far given of the embodiment of the accessory attachment structure of the present invention, to which the present invention shall not be, however, restricted. The present invention may be modified whenever necessary within a scope not departing from the gist of the present invention.
In the present embodiment, for example, the duct 321 is given as a long object which is supported by the support member 322, to which the present invention shall not be restricted. The long object may include, for example, piping, a cable tray, and an electrical wire conductor.
Next, in the present embodiment, the support is provided by means of the H-steel members 324, 325 for supporting the duct 321 from below. However, the support may be constituted so as to hang down the duct 321. Further, the support member 322 may include an L-steel member, a channel and a pipe in place of the H-beam member.
In the present embodiment, the attachment plate 323 has a substantially square external shape when viewed from above. There is no particular restriction on the outer shape.
Further, constituent features of the above-described embodiment may be replaced by known constituent features whenever necessary within a scope not departing from the gist of the present invention. Still further, the above-described embodiment may be combined in an appropriate manner.
Hereinafter, a description will be given of a design system of an SC structure and a design method of an SC structure according to a Twelfth Embodiment of the present invention by referring to
First, as shown in
One end of the tie bar 406 is joined to one outside steel plate 403 of the pair of outside steel plates 403, 404. The other end of the tie bar 406 is joined to the other outside steel plates 404 and placed inside the steel plate frame 405 (embedded into the concrete 401). The studs 402 enhance connection of the outside steel plates 403, 404 with the concrete 401, etc. Next, the stud 402 of the present embodiment is a headed stud equipped with a head 2b at one end of a shaft portion 402a. The other end of the shaft portion 402a of the stud 402 is joined to an inner face of each of the outside steel plates 403, 404 by fillet welding or the like and placed inside the steel plate frame 405 (embedded into the concrete 401). Further, in the SC structure 410 of the present embodiment, as schematically shown in
Further, as shown in
Next, in the present embodiment, a design system (design system of the SC structure) 420 is used to design the above-constituted SC structure 410. As shown in
In the present embodiment, in designing the SC structure 410, (in the design method of the SC structure of the present embodiment), the following idea is applied to a case where a large pull-out load is applied to one stud 402 at the center in a state that a uniform load is applied to each of the studs 402 disposed in a group (in a state shown in
First, the stud will be calculated for the load-bearing capacity in cone failure by using the following formula (2).
Where φ is the reduction coefficient (safety coefficient), Ac is the projection area and Fc is the concrete strength.
Next, in the present embodiment, the structure condition input device 411 is used to input the stud interval, Ps, the stud embedded depth, Le, and the stud diameter D. Next, on the basis of structure conditions input by the structure condition input device 411, the body load-calculating device 412 is used to calculate an body load. Here, the body load is a load which can be taken into account in design such as its own weight of the SC structure 410 and seismic loads excluding a load of the accessory 407.
Further, the reference load-calculating device 413 is used to calculate a reference load which can be supported by each one of the studs when supported by all the plurality of studs. Here, the reference load is an allowable load of the stud 402. Still further, as shown in
Next, the load ratio-calculating device 414 is used to calculate a load ratio α of the body load to the reference load. Further, with reference to a relationship between the load ratio α and the effective projection area Ac stored by the storage device 415, the effective projection area Ac is calculated from the load ratio α by using the effective projection area-calculating device 416.
For example, in the present embodiment, the storage device 415 stores in advance a relationship between the load ratio and the effective projection area shown in
On the basis of the effective projection area Ac calculated by the effective projection area-calculating device 416, the load-calculating device 417 is used to calculate a load which can be supported by one stud including an accessory load. Here,
As shown in the above preliminary calculation results, according to the design method of the present embodiment, the stud can be determined for the load-bearing capacity in a state of L0 where no body load is applied (in a state of the circular effective projection area Ac(circle)). Also, the stud can be determined for the load-bearing capacity in a load state between a state that the body load is not applied at all and a state that an allowable load of the stud 402 (reference load) is applied as the body load (rectangular effective projection area Ac(square)). The above-described load state includes, for example, a state of L1/3 that ⅓ of the allowable load of the stud is applied as the body load and a state of L2/3 that ⅔ of the allowable load of stud is applied as the body load.
That is, according to the design system 420 of SC structure 410 and the design method of SC structure 410 of the present embodiment, as compared with a conventional design method of an SC structure, a method for determining an effective projection area in cone failure is reviewed to determine an effective projection area Ac depending on an applied load. Thereby, the stud can be rationally evaluated for the load-bearing capacity.
A description has been so far given of one embodiment of the design system of the SC structure and the design method of the SC structure of the present invention. However, the present invention shall not be restricted to the Twelfth Embodiment described above and may be modified whenever necessary within a scope not departing from the gist of the present invention.
Hereinafter, a description will be given of an SC structure of a Thirteenth Embodiment of the present invention by referring to
An SC structure (steel plate-reinforced concrete structure) 510 of the present embodiment is provided, for example as shown in
One end of the tie bar 506 is joined to one outside steel plate 503 of the pair of outside steel plates 503, 504. The other end of the tie bar 506 is joined to the other outside steel plate 504 and placed inside the steel plate frame 505 (embedded into the concrete 501).
The studs 502 enhance connection of the outside steel plates 503, 504 with the concrete 501 or others. Next, the stud 502 of the present embodiment is a headed stud which is provided with a head 502b at one end of a shaft portion 502a. The other end of the shaft portion 502a of the stud 502 is joined to an inner face of each of the outside steel plates 503, 504 by fillet welding or the like and placed inside the steel plate frame 505 (embedded into the concrete 501).
In the SC structure 510 of the present embodiment, the plurality of studs 502 are disposed in a group and fixedly installed on the outside steel plates 503, 504. Further, the plurality of studs 502 are not arranged or disposed vertically and transversely (lattice form arrangement) as with a conventional case as shown in
In the present embodiment, the plurality of studs 502 arranged in a zigzag form are arranged in such a manner that three mutually adjacent studs 502 take the vertexes of an equilateral triangle, as shown in
An idea used in evaluating the pull-out-bearing capacity of the stud 502 assumes cone failure and sets an angle of cone failure surface at 45 degrees. Therefore, where the plurality of studs 502 are arranged so that the three above-described adjacent studs 502 take the vertexes of an equilateral triangle, the interval P of adjacent studs 502, that is, the diameter of a circular projection plane Ac in cone failure is given as one side of the equilateral triangle, and the circular projection planes Ac of adjacent studs 502 are not overlaid but come in contact with each other. Therefore, the circular projection planes Ac of the plurality of studs 502 are not overlaid but in contact with each other, thereby, reaching a state that the circular projection planes Ac of the plurality of studs 502 are disposed most densely in a plane of the steel plate.
Next, in the SC structure 510 of the present embodiment, the plurality of studs 502 are disposed as described above, by which the studs are disposed uniformly and rationally all over on the surface of the SC structure 510. Further, no projection planes are overlapped between the studs, thereby eliminating the need for taking into account the effects of the studs disposed in a group on evaluation of the load-bearing capacity.
Therefore, in the SC structure 510 of the present embodiment, it is possible to evaluate the load-bearing capacity of each stud 502 as an independent stud 502. As compared with a case where the plurality of studs 502 are arranged and disposed vertically and transversely (lattice form arrangement), the stud can be evaluated rationally for the load-bearing capacity.
On the other hand, as shown in
Here, in the SC structure, on joining the attachment plate 507b (piping support 507a) to the outside steel plate 503, transfer of loads to as many studs 502 as possible is advantageous in view of the strength. In contrast, in the SC structure 510 of the present embodiment, a plurality of studs 502 are disposed so that as described above, three mutually adjacent studs 502 take the vertexes of an equilateral triangle and the plurality of studs 502 are disposed so that circular projection areas Ac are not overlaid but in contact with each other.
In the SC structure 510 of the present embodiment in which the plurality of studs 502 are disposed as described above, as shown in
A description has been so far given of one embodiment of an SC structure of the present invention. The present invention shall not be restricted to the Thirteenth Embodiment described above but may be modified whenever necessary within a scope not departing from the gist of the present invention.
For example, in the present embodiment, a plurality of studs 502 are disposed in a zigzag form, that is, disposed so that three mutually adjacent studs 502 take the vertexes of an equilateral triangle, by which circular projection areas Ac are not overlaid but in contact with each other. In contrast, it is acceptable that as shown in
As shown in
In the SC structure 510, disposal of the studs is decided in general so as not to cause buckling of the steel plates 503, 504 of the SC structure 510. Next, the following formula (2) expressed as a width-to-thickness ratio of the steel plate 503 supported at points by the studs 502 is indicated on page 49, “Technical Code for Seismic design of Steel Plate-reinforced Concrete Structures” Japan Electric Association Code (Atomic Power Section), JEAC 4618-2009 complied by the Japan Electric Association on Mar. 30, 2010 (refer to
[Formula 6]
L/t≤600/√{square root over (F)} (6)
Next, where the stud interval Ps is set on the basis of the above-described formula (6), it is possible to establish the stud embedded depth Le which is more rational than the present embodiment, with the aim of rationally disposing the studs 502 in the form of an equilateral triangle. That is, in reverse to the present embodiment, even where the stud interval Ps is set first, it is possible to decide rationally the stud embedded depth Le on disposal of the studs 502 at the equilateral triangle.
Hereinafter, a description will be given of a construction method of an SC structure and an SC structure of the Fourteenth Embodiment of the present invention by referring to
An SC structure (steel plate-reinforced concrete structure) 610 of the present embodiment is, for example, as shown in
One end of the tie bar 614 is joined to one outside steel plate 611 of the pair of outside steel plates 611, 612. The other end of the tie bar 614 is joined to the other outside steel plate 612 and placed inside the steel plate frame 613 (embedded into the concrete 616). The studs 615 enhance connection of the outside steel plates 611, 612 with the concrete 616, etc. Next, the stud 615 of the present embodiment is a headed stud equipped with a head 615b at one end of a shaft portion 615a. The other end of the shaft portion 615a of the stud 615 is joined to the inner face 611a or 612b of the outside steel plate 611 or 612 by fillet welding or the like and placed inside the steel plate frame 613 (embedded into the concrete 616).
As shown in
On the other hand, in the SC structure 610 of the present embodiment, a plurality of studs 615 (tie bars 614) are arranged and disposed on the inner faces 611a, 612a of the outside steel plates 611, 612 and fixedly installed thereon. Further, on the outside steel plate 611, a center position surrounded by four studs 615 (and tie bars 614) thus arranged and disposed is given as an attachment position to which the accessory 617 can be attached. Still further, a locking portion 620 is installed at a plurality of attachment positions to which the accessories 617 are attached on the outer face 611b of the outside steel plate 611. The locking portion 620 of the present embodiment is an engagement recess portion (recess) with which a raised portion 619 formed on an attachment face of the attachment plate 617b is engaged. The attachment plate 617b and the piping support 617a are locked by the locking portion 620. In the present embodiment, the attachment device 618 is made up of the raised portion 619 and the locking portion 620 having an engagement recess portion. The raised portion 619 of the accessory 617 is selectively locked to any of the plurality of locking portions 620 installed at each of the plurality of attachment positions, by which the accessory 617 is fixed onto the outer face 611b of the outside steel plate 611.
Next, a description will be given of a construction method (production method) of the above-constituted SC structure 610 of the present embodiment. On constructing the SC structure 610 of the present embodiment, first, the plurality of studs 615 are fixedly installed on inner faces 611a, 612a of the outside steel plates 611, 612 (stud-attaching step).
Further, at least a part of the attachment device 618 is disposed at a plurality of attachment positions on the outer face 611b of the outside steel plate 611 (attachment device-preparing step). Here, in the present embodiment, at the attachment device-preparing step, a locking portion 620 (that is, an engagement recess portion), or a part of the attachment device 618, is formed at every attachment position which is a center position surrounded by four studs 615 (and the tie bars 614).
Next, the outside steel plates 611, 612 are disposed at predetermined positions to forma steel plate frame 613 (steel plate-installing step). Next, the concrete 616 is installed inside the steel plate frame 613 (concrete-installing step).
Next, the accessory 617 having the attachment plate 617b and the piping support 617a is fixed and attached to the outer face 611b of the outside steel plate 611 (accessory-fixing step). At this time, the raised portion 619 installed on the attachment plate 617b is selectively engaged with any of the engagement recess portions of the locking portion 620 installed at the plurality of attachment positions on the outer face 611b of the outside steel plate 611, by which the accessory 617 is locked. Further, the attachment plate 617b is fixed to the outer face 611b of the outside steel plate 611 by welding. Finally, a piping 602 is installed on the piping support 617a of the accessory 617 (piping-installing step). Thereby, the accessory 618 is attached to the outer face 611b of the outside steel plate 611 and construction is completed.
Next, in the construction method of the SC structure 610 of the present embodiment, at the attachment device-preparing step, at least the locking portion 620 (engagement recess portion) or the part of the attachment device 618 is disposed at the plurality of attachment positions on the outer face 611b of the outside steel plate 611 to which the accessory 617 can be attached. Therefore, at least a part of the attachment device 618 can be disposed, while the position of the stud 615 can be confirmed easily.
In the present embodiment, at the accessory-fixing step, the raised portion 619 of the attachment plate 617b of the accessory 617 is engaged with the engagement recess portion of the locking portion 620 to attach the accessory 617. Thereby, the accessory 617 can be attached, with confirmation given to the position of the stud 615. It is therefore possible to attach and construct the accessory 617, while a load applied to each one of the studs can reliably be kept low.
Further, the accessory 617 is selectively locked to any of the locking portions 620 installed at the plurality of attachment positions on the outer face 611b of the outside steel plate 611. Thereby, the accessory 617 can be attached at any given position.
Therefore, in the construction method of the SC structure 610 of the present embodiment, at the attachment device-preparing step, at least a part of the attachment device 618 is disposed at the plurality of attachment positions on the outer face 611b of the outside steel plate 611 to which the accessory 617 can be attached. It is therefore possible to dispose at least a part of the attachment device 618, while the position of the stud 615 can be confirmed easily. Next, at the piping-installing step, on installation of the piping 602 on the accessory 617, the piping 602 can be attached and constructed, while a load applied to each one of the studs is reliably kept low.
Further, in the SC structure 610 of the present embodiment, the raised portion 619 of the accessory 617 is selectively locked to any of the locking portions 620 installed at the plurality of attachment positions on the outer face 611b of the outside steel plate 611. Therefore, it is possible to attach the accessory 617 to the outer face 611b of the outside steel plate 611 via the attachment device 618. Thereby, such a simple procedure is carried out that the plurality of attachment positions at which a load applied to each one of the studs can be kept low are set and the raised portion 619 of the main body 617 is locked to the locking portion 620 installed at the attachment position, thus making it possible to attach and construct the accessory 617 while the load applied to each one of the studs is reliably kept low. Still further, the raised portion 619 of the accessory 617 can be selectively locked to any of the locking portions 620 installed at the plurality of attachment positions on the outer face 611b of the outside steel plate 611. It is therefore possible to attach the accessory 617 to any given attachment position.
Therefore, according to the construction method of the SC structure 610 and the SC structure 610 of the present embodiment, the accessory 617 can be attached and constructed, while a load applied to each one of the studs is reliably kept low. As compared with a conventional case, it is also possible to reduce the time necessary for constructing the accessory 617 and also time necessary for designing the attachment position of the accessory 617.
A description has been so far given of one embodiment of the construction method of the SC structure and the SC structure of the present invention. However, the present invention shall not be restricted to the Fourteenth Embodiment described above but may be modified whenever necessary within a scope not departing from the gist of the present invention.
In the present embodiment, the locking portion 620 of the attachment device 618 is given as an engagement recess portion and the raised portion 619 installed on the attachment plate 617b of the accessory 617 is engaged with the engagement recess portion. However, it is acceptable that the locking portion 620 be given as an engagement raised portion and a recess portion installed on the accessory 617 be engaged with the engagement raised portion 620, by which the main body 617 is locked to the locking portion 620.
Further, as shown in
Hereinafter, a description will be given of an SC structure of a Fifteenth Embodiment of the present invention by referring to
An SC structure (steel plate-reinforced concrete structure) 709A of the present embodiment is, for example as shown in
Further, as shown in
One end of the tie bar 704 of the SC structure 709A is joined to one outside steel plate 701 of the pair of outside steel plate 701, 702. The other end of the tie bar 704 is joined to the other outside steel plate 702 and placed inside the steel plate frame 703 (embedded into the concrete 706).
The studs 705 enhance connection of the outside steel plates 701, 702 with the concrete 706, etc. The studs 705 are fixed to the outside steel plates 701, 702 and installed so as to protrude into the steel plate frame 703. On the other hand, the stud 705 of the present embodiment is provided with a cylindrical shaft portion 710, a first holding portion (the other holding portion) 711 and a head 712, as shown in
In the SC structure 709A, a through-hole 713 which pass through from an inner face 701a (702a) to an outer face 701b (702b) is formed at a predetermined position of the outside steel plate 701 (702) to which the stud 705 is attached. In the SC structure 709A of the present embodiment, as shown in
Here, it is desirable that the studs 705 be constructed by being attached to the outside steel plates 701, 702 with use of an AR machine (automatic studding machine, automatic riveter) in a modified manner.
As shown in
On attachment and construction of the studs 705 by using the AR machine 715, first, positions at which the studs 705 are attached to the outside steel plate 701 (702) are stored in an NC machine. Next, as shown in
Thereby, in the SC structure 709A of the present embodiment, the AR machine 715 can be used to attach the studs 705 automatically and rationally to the outside steel plates 701, 702. Further, as compared with a conventional case where the studs 705 are fixed to the outside steel plates 701, 702 by welding, it is possible to reduce man-hours necessary for constructing the studs and also reduce the construction cost.
On the other hand, as shown in
Thereby, in the SC structure 709A of the present embodiment, on attachment of the accessory 707, the position of the stud 705 can be easily located by means of one holding portion 714. As a result, it is possible to reduce the time necessary for constructing the accessory 707 and the time necessary for designing an attachment position of the accessory 707.
Next, with reference to
As shown in
The second nut 723 is screwed into the shaft portion 721a of the bolt 721, by which the first nut 722 is fastened with the second nut 723. As a result, the outside steel plate 701 (702) is fastened by these two nuts of the first nut 722 and the second nut 723, thereby preventing loosening of the nut 722. As a result, the stud 720 is reliably fixed to the outside steel plate 701 (702).
Further, the third nut 724 is screwed into the shaft portion 721a of the bolt 721. At this time, the third nut 724 is placed on the other side of the shaft portion 721a of the bolt 721. As a result, the stud 720 of the present embodiment has a head at the other end by the third nut 724 and formed like a headed stud.
In the above-constituted SC structure 709B of the present embodiment, the stud 720 is made up of the bolt 721 and the nuts 722, 723, 724. The shaft portion 721a of the bolt 721 is inserted through the through-hole 713 on the outside steel plate 701 (702) to fasten the nut 722, by which the head 721b of the bolt 721 and the nut 722 are given as a pair of holding portions and hold the outside steel plate 701 (702) between them. As a result, the stud 720 can be fixed to the SC structure 709B. Thereby, also in the SC structure 709B of the present embodiment, as compared with a conventional case where a stud is fixed to the outside steel plate by welding, it is possible to reduce man-hours for constructing the stud and also reduce the construction costs.
In the SC structure 709B of the present embodiment, the outside steel plate 701 (702) is held between a pair of holding portions, that is, the head 721b of the bolt 721 and the nut 722 and fixed by the stud 720 of the SC structure 709B. Therefore, it is possible to locate a position of the stud 720 from outside of the outside steel plate 701 (702) by means of the head 721b of the bolt 721 which is a second holding portion installed on an outer face 701b (702b) of the outside steel plate 701 (702) on attachment of an accessory 707.
Accordingly, in the SC structure 709B of the present embodiment as well, as with Fifteenth Embodiment, the position of the stud 720 can be easily located by means of one holding portion 721b on attachment of the accessory 707. Therefore, it is possible to reduce the time necessary for constructing the accessory 707 and also the time necessary for designing an attachment position of the accessory 707.
A description has been so far given of the Fifteenth Embodiment and Sixteenth Embodiment of the SC structures of the present invention. The present invention shall not be, however, restricted to the Fifteenth Embodiment and Sixteenth Embodiment described above and may be modified whenever necessary within a scope not departing from the gist of the present invention.
As shown in
The present invention is able to reduce a load which is applied to each one of the bars. Thus, even where a load of an accessory received by the SC structure is relatively great, the accessory can be attached to any given position.
According to the present invention, stress resulting from the load of the accessory is allowed to act on a tie bar via an attachment plate. Further, it is possible to easily locate an attachment position of the accessory and reduce a load applied to each one of the tie bars on attachment of the accessory,
The accessory attachment structure of the present invention can be increased in rigidity by a simple and lightweight structure and also attach an accessory after confirmation is made for strength of an attachment position.
In the design system of the SC structure and the design method of the SC structure of the present invention, as compared with a conventional design method of the SC structure, a stud can be evaluated rationally for the load-bearing capacity thereof by reviewing a method determining an effective projection area in cone failure.
In the SC structure of the present invention, a plurality of studs are provided by being arranged in a zigzag form, thus making it possible to evaluate each of the studs as an independent stud. The stud can be evaluated rationally for the load-bearing capacity, as compared with a case where a plurality of studs are arranged and disposed vertically and transversely (where they are arranged in a lattice form).
According to the construction method of the SC structure and the SC structure of the present invention, it is possible to set a plurality of attachment positions at which a load applied to each one of the studs can be kept low while a position of the stud is easily confirmed and also attachment device can be installed at the attachment position. It is thereby possible to attach and construct an accessory in a state that a load applied to each one of the studs is reliably kept low. As compared with a conventional case, it is possible to reduce the time necessary for constructing the accessory and also the time necessary for designing the attachment position of the accessory.
In the SC structure of the present invention, a shaft portion is inserted through a through-hole formed on an outside steel plate, and a pair of holding portions installed integrally at this shaft portion are used to hold the outside steel plate between them, thereby fixing a stud. It is therefore possible to locate a position of the stud from outside of the outside steel plate by means of one holding portion installed on an outer face of the outside steel plate. Accordingly, on attachment of an accessory, a position of the stud can be easily located by means of one holding portion. It is therefore possible to reduce the time necessary for constructing the accessory and also the time necessary for designing an attachment position of the accessory.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2010-213808 | Sep 2010 | JP | national |
| 2010-235468 | Oct 2010 | JP | national |
| 2010-280561 | Dec 2010 | JP | national |
| 2011-040004 | Feb 2011 | JP | national |
| 2011-040006 | Feb 2011 | JP | national |
| 2011-040007 | Feb 2011 | JP | national |
| 2011-040009 | Feb 2011 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2011/070552 | 9/9/2011 | WO | 00 | 4/23/2013 |
