Patent Application
20240426125
The present invention relates to a composite material reinforcement device for a box-type concrete structure and a method of constructing the same, and more specifically, to a composite material reinforcement device for a concrete structure and a method of constructing the same, which are effective in improving internal strength and reinforcing earthquake resistance as a cross-section of the concrete structure is expanded and rigidity and ductility capabilities are simultaneously improved using a reinforcement device for a structure in which a composite material and a hollow aluminum beam are integrated with each other.
In general, box-type concrete structures used for purposes such as underpasses, subways, waterways, etc., may be subject to a load greater than a design load due to filling performed on or a traffic load applied to upper portions of the box-type concrete structures. Such a load causes excessive shear force and negative moment to be applied to a side wall in a vertical direction or a corner, i.e., an edge portion between a ceiling and a side wall, and thus, structural safety is damaged. Accordingly, there are cases when a corner in a box-type concrete structure needs to be structurally reinforced.
Since concrete fails to increase a load-carrying capacity of a member in a negative moment section of the box-type concrete structure, there is a problem in that shear force or negative moment cannot be sufficiently resisted. Therefore, part of the shear force or negative moment applied to the corner in the box-type concrete structure needs to be dispersed by having a reinforcement device sustain the part of the shear force or negative moment applied to the corner.
When there is a need to reinforce this box-type concrete structure, since a reinforcing material needs to be a non-conductor, there is a disadvantage such that a reinforcing material made of a steel plate cannot be used.
In relation to this, a technology of reinforcing strength of a structure by attaching an earthquake-resistant device configured to connect a ceiling to a side wall of a box-type concrete structure has been proposed. However, this earthquake-resistant device only reduces member force by dispersing external force applied to a corner, and does not have an effect of increasing resistance force of a member. Thus, there is such a problem that performance of earthquake resistance against a seismic load is insufficient.
As a prior art document, Korean Patent Publication No. 10-1879191, entitled “Seismic Reinforcement Device for Corner of Box-type Underground Structure and Method of Constructing the Same,” is disclosed.
Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a composite material reinforcement device for a box-type concrete structure and a method of constructing the same, which are effective in improving internal strength and reinforcing earthquake resistance, by applying the composite material reinforcement device having a composite material and a hollow aluminum beam integrated with each other to a concrete structure to expand a cross-section of a concrete structure and simultaneously improve rigidity and ductility capabilities.
To accomplish the above object, according to one aspect of the present invention, there is provided a composite material reinforcement device for a concrete structure, the composite material reinforcement device having a length in a forward-and-rear direction to reinforce earthquake resistance of a box-type concrete structure and including: a central portion including an edge portion provided to have an inner space having a trapezoidal cross-section with reference to a longitudinal direction, and a partition wall portion dividing the inner space into at least one partition space; and a reinforcement portion located on a top and a bottom of the central portion and integrally molded to cover the central portion, wherein the reinforcement portion includes: a first plate located on the top of the central portion to cover an upper portion of the central portion; a second plate curved to correspond to a shape of the central portion and located at the bottom of the central portion to cover a lower portion of the central portion; and an extension portion in which the first plate and the second plate extend from both ends of the central portion to be bonded to each other.
In addition, the composite material reinforcement device may be installed when an upper surface of the first plate is in contact with a part of the box-type concrete structure, the part being vulnerable to vibration.
In addition, the second plate may include a cutting line disposed in a lower surface, and the composite material reinforcement device may be bent with reference to the cutting line to be installed in a portion in which the box-type concrete structure is bent.
In addition, the central portion may be made of an aluminum alloy, and the reinforcement portion may include a prepreg sheet provided by impregnating a thermosetting resin into a fiber sheet including at least one of carbon fiber and glass fiber.
In addition, the central portion may be provided in plurality to be extensible in a width direction.
In addition, the composite material reinforcement device may further include a connection member configured to connect a plurality of composite material reinforcement devices to each other in a longitudinal direction to be longitudinally extensible, wherein the connection member is provided to have a bar shape and coupled between an end of one composite material reinforcement device and an end of another composite material reinforcement device to be inserted into one of the at least one partition space of the central portion of each of the plurality of composite material reinforcement devices.
In addition, the central portion may further include a fixing portion arranged in a lower portion of the at least one partition space and configured to fix the connection member, and the fixing portion may include: a fixing bar disposed along a length in the at least one partition space such that an upper surface of the fixing bar is in contact with the connection member; and a plurality of fixing springs disposed on a lower surface of the at least one partition space such that upper ends of the plurality of fixing springs are connected to a lower surface of the fixing bar.
In addition, the fixing bar may be divided into a plurality of zones on an upper surface along a longitudinal direction to have one fixing protrusion disposed on each of the plurality of zones, and the connection member may have a fixing groove disposed in a position on a lower surface in correspondence with the one fixing protrusion to couple the one fixing protrusion into the fixing groove to thereby increase fixing power of the connection member with respect to the composite material reinforcement device.
In addition, the fixing portion may further include an upward-and-downward movement portion configured to increase fixing power of the connection member by compressing the fixing spring to fix the fixing bar to be located in a lower portion or expanding the fixing spring to fix the fixing bar to be located in an upper portion, and the upward-and-downward movement portion may include: a movement member disposed on a lower surface of the fixing bar to penetrate through a lower surface of the composite material reinforcement device; and a movement hole disposed in a lower surface of the composite material reinforcement device so that the movement member penetrates through the movement hole.
In addition, the fixing bar may define an inner space of the fixing bar by having a hollow portion therein, and the movement member may include: a head portion provided to have a plate shape and located in the inner space of the fixing bar; a body portion provided to have a cylindrical shape on a lower surface of the head portion and located inside the fixing spring such that an upper side penetrates through a lower surface of the fixing bar and a lower side penetrates through the movement hole; a leg portion provided to have a plate form on a lower surface of the body portion and located on a lower surface of the composite material reinforcement device; and a movement protrusion disposed on a side surface of the body portion to penetrate through the movement hole, and then, rotate to be fixed to a lower surface of the composite material reinforcement device.
In addition, according to another aspect of the present invention, there is provided a method of constructing a composite material reinforcement device configured to reinforce earthquake resistance of a box-type concrete structure, the method including: a device preparation step of preparing at least one composite material reinforcement device including a central portion including an edge portion provided to have an inner space having a trapezoidal cross-section with reference to a longitudinal direction and a partition wall portion dividing the inner space into at least one partition space, and a reinforcement portion located on a top and a bottom of the central portion and integrally molded to cover the central portion; a fixing step of fixing the at least one composite material reinforcement device to the box-type concrete structure using an anchor in a state when an upper surface of a first plate is in contact with a part of the box-type concrete structure, the part being vulnerable to vibration; and a filling step of filling the at least one partition space with a reinforcing material.
In addition, the method may further include, after the device preparation step, a bending forming step of bending the at least one composite material reinforcement device with reference to a cutting line to install the at least one composite material reinforcement device in a portion in which the box-type concrete structure is bent.
In addition, the method may further include, after the device preparation step, a connection step of inserting a connection member into the at least one partition space by connecting a plurality of composite material reinforcement devices to each other in a longitudinal direction to be extensible in the longitudinal direction, wherein the connection member is provided to have a bar shape and coupled between an end of one composite material reinforcement device and an end of another composite material reinforcement device to be inserted into one of the at least one partition space of the central portion of each of the plurality of composite material reinforcement devices.
According to an embodiment of the present invention, a composite material reinforcement device for a concrete structure and a method of constructing the same are effective in improving internal strength and reinforcing earthquake resistance with respect to a structure, as a composite material and a hollow aluminum beam are integrated with each other.
In addition, since a chemically resistant material provides excellent corrosion resistance against pollution, sewage, etc., there is such an advantage that physical properties are not worsened even for a long period of time.
In addition, a shear reinforcement effect may be increased by simultaneously reinforcing a slab and a corner.
Hereinafter, the description of the present invention with reference to the drawings is not limited to particular modes of practice, and allows for various changes and numerous embodiments. In addition, it is to be appreciated that all changes, equivalents, and substitutes that do not depart from the spirit and technical scope of the present invention are encompassed in the present invention.
Although the terms such as first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another component.
Like reference numerals in the drawings throughout the specification denote like elements.
An expression used in the singular encompasses the expression of the plural, unless it has a clearly different meaning in the context. In addition, it is to be understood that the terms such as “including,” “comprising,” or “having,” etc., are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof disclosed in the specification, and are not intended to preclude the possibility that one or more other features, numbers, steps, actions, components, parts, or combinations thereof may exist or may be added.
Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, when describing with reference to the accompanying drawings, like reference numerals in the drawings denote like elements, and thus their descriptions will not be repeated. In the description of the present invention, certain detailed explanations of related art are omitted when it is deemed that they may unnecessarily obscure the essence of the present invention.
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawing including
A box-type concrete structure 2 is a closed polygonal structure installed in an underpass, a subway, a waterway, etc. and including an upper slab, side walls on both sides, and a lower floor.
Referring to
The central portion 10 is made of an aluminum alloy and is located at a center of the composite material reinforcement device 1 to provide support inside, and may include an edge portion 11 and a partition wall portion 12.
The edge portion 11 may be provided to have an inner space having a trapezoidal cross-section with reference to a longitudinal direction. The edge portion 11 may be, most preferably, provided to have a trapezoidal shape, but is not limited thereto. The edge portion 11 may be provided to have various types of shape such as a square or a triangle.
The partition wall portion 12 may divide the inner space into one or more partition spaces S1. Each of the partition spaces S1, obtained by dividing the partition wall portion 12, may be provided to have a certain shape.
In detail, as illustrated in
In addition, the partition wall portion 12 may be disposed vertically as illustrated in
A plurality of central portions 10 may be provided to be extensible in a width direction. In detail, as illustrated in
Accordingly, one or more central portions 10 may be provided in correspondence with a width of a construction surface, and one composite material reinforcement device 1 may be installed on the construction surface. This may be effective in seismic reinforcement and shear reinforcement and reduce construction time.
The reinforcement portion 20 is located on a top and a bottom of the central portion 10 and integrally molded to cover the central portion 10, and may include a first plate 21, a second plate 22, and an extension portion 23.
The first plate 21 may be located on the top of the central portion 10 to cover an upper portion of the central portion 10, and may be disposed to have a flat surface.
The second plate 22 may be curved to correspond to a shape of the central portion 10 and located at the bottom of the central portion 10 to cover a lower portion of the central portion 10.
The extension portion 23 may be formed such that the first plate 21 and the second plate 22 extend from both ends of the central portion 10 and are bonded to each other.
The reinforcement portion 20 may include, most preferably, a prepreg sheet provided by impregnating a thermosetting resin into a fiber sheet containing at least one of carbon fiber and glass fiber. In this case, various types of thermosetting resin such as a phenol resin, an epoxy resin, a polyester resin, etc. may be used. Most preferably, a phenol resin may be used, but the present invention is not limited thereto.
Additionally, in the reinforcement portion 20, inexpensive glass fiber is applied to the first plate 21 and carbon fiber having high strength is applied to the second plate 22 to provide support from a bottom. Thus, the composite material reinforcement device 1 such that strength is increased and a cost is reduced may be provided.
In the reinforcement portion 20 configured in this way, the first plate 21 and the second plate 22 may be integrally provided to be in contact with each other in the extension portion 23 to have the central portion 10 at a center therebetween. Thus, strength of the central portion 10 may be reinforced, and the composite material reinforcement device 1 may have a light weight.
In this case, when being installed in the box-type concrete structure 2, the composite material reinforcement device 1 may be fixedly installed in the box-type concrete structure 2 by having an upper surface of the first plate 21 in contact with a part of the box-type concrete structure 2 vulnerable to vibration, i.e., a construction surface.
Accordingly, the composite material reinforcement device 1 may be installed to be stably fixed to the construction surface by bringing an upper surface of the first plate (21) which is flat overall into contact with the construction surface and having an anchor inserted into the extension portion 23.
Referring to
In detail, as illustrated in
Particularly, the composite material reinforcement device 1 may be easily applied to a bent part such as a beam-column joint, a wall-floor plate joint, etc. which is vulnerable to an earthquake. For example, the composite material reinforcement device 1 may be positioned sequentially from a slab A to a corner B, which are most vulnerable to an earthquake in the box-type concrete structures 2, to reinforce a sectional force of the corner B, thereby improving internal strength and reinforcing earthquake resistance.
In this case, the cutting line 24 may be disposed at an angle of 45 to 90° with reference to a longitudinal direction. The cutting line 24 may be preferably disposed at an angle of 68 to 75°, and most preferably at an angle of 70°, but is not limited thereto.
In detail, comparing
The composite material reinforcement device 1 may reinforce not only the slab A and the corner B, but also a column of the box-type concrete structure 2 as shown in
Referring to
The connection member 30 may be preferably provided to have a bar shape with such a size that the connection member 30 may be inserted into one of the partition spaces S1.
The connection member 30 may be coupled between an end of one composite material reinforcement device 1 and an end of another composite material reinforcement device 1. In detail, the connection member 30 may have one end inserted into a partition space S1 of one composite material reinforcement device 1 as shown in
As such, the plurality of composite material reinforcement devices 1 may be connected to each other through the connection member 30 to be applied to various construction portions such as a long or large area, etc. as needed by a constructor.
Referring to
The fixing portion 15 may be arranged in a lower portion of the partition space S1 and fixed by pushing the connection member 30 inserted into the partition space S1 from a bottom, and may include a fixing bar 150 and a fixing spring 151.
The fixing bar 150 may be disposed along a length of the partition space S1 so that an upper surface of the fixing bar 150 is in contact with a lower surface of the connection member 30 inserted into the partition space S1. In this case, the fixing bar 150 may be, most preferably, disposed in a position of the connection member 30 inserted into the partition space S1 to have a same length as that of the connection member 30 so that a whole area of the fixing bar 150 is in contact with the connection member 30. However, the fixing bar 150 is not limited thereto.
The fixing spring 151 is arranged on a lower surface of the partition space S1, with an upper end of the fixing spring 151 connected to a lower surface of the fixing bar 150.
In the fixing portion 15, the fixing bar 150 may move upward or downward as the fixing spring 151 is expanded or compressed.
Accordingly, in the fixing portion 15, when the fixing spring 151 is expanded before the connection member 30 is inserted into the partition space S1, the fixing bar 150 may be positioned in an upper portion as shown in
In addition, the fixing bar 150 may be configured such that an upper surface of the end into which the connection member 30 is inserted is diagonally provided. Thus, the insertion of the connection member 30 may be smoothly performed. However, the fixing bar 150 is not limited thereto.
In the fixing portion 15, a protrusion 1500 may be disposed on the fixing bar 150 and a fixing groove may be disposed in the connection member 30 to prevent the connection member 30 from being separated from the partition space S1 and increase fixing force.
Referring to
Referring to
In addition, the protrusion 1500 may be coupled into the fixing groove 31 in a position corresponding to a desirable insertion length of the connection member 30. Thus, the insertion length of the connection member 30 may be adjusted. Accordingly, when the connection member 30 is inserted into partition spaces S1 located at both sides in the composite material reinforcement device 1, a problem such that the connection member 30 is inserted further into one partition space S1 compared to another one partition space S1 may be resolved.
Referring to 14A to 16B, the fixing portion 15 of the composite material reinforcement device 1 according to an embodiment of the present invention may further include the upward-and-downward movement portion configured to adjust a position of the fixing bar 150 so that the connection member 30 is smoothly inserted into the partition space S1.
The upward-and-downward movement portion compresses the fixing spring 151 to fix the fixing bar 150 in a lower position while the connection member 30 is being inserted into an inner space, and expands the fixing spring 151 to have the fixing bar 150 located in an upper position when the connection member 30 is inserted into the partition space S1 to thereby increase fixing force of the connection member 30. The upward-and-downward movement portion may include a movement member 152 and a movement hole 40.
The movement member 152 is arranged on a lower surface of the fixing bar 150 to penetrate through a lower surface of the composite material reinforcement device 1, and may include a head portion 1520, a body portion 1521, a leg portion 1522, and a movement protrusion 1523.
The movement hole 40 may be arranged in a lower surface of the composite material reinforcement device 1 so that the movement member 152 penetrates therethrough.
In this case, the fixing bar 150 may define an inner space S2 of the fixing bar by having a hollow portion therein, but is not limited thereto. A hollow portion may be disposed in only a part of the fixing bar 150 in which the movement member 152 is located.
The head portion 1520 is provided to have a plate shape and is fixedly positioned in the inner space S2 of the fixing bar. The head portion 1520 may have a plate form in various shapes such as a circle, a triangle, a quadrilateral, etc., but is not limited thereto. The head portion 1520 may be provided to be larger than the body portion 1521 to be described later, and thus, fixed in the inner space S2 of the fixing bar. Accordingly, the head portion 1520 is fixedly positioned in the inner space S2 of the fixing bar so that the movement member 152 is connected to the fixing bar 150 without separation.
The body portion 1521 may be provided to have a cylindrical shape on a lower surface of the head portion 1520 and located inside the fixing spring 151. In this case, the body portion 1521 may be provided such that an upper portion penetrates through a lower surface of the fixing bar 150 and a lower portion penetrates through the movement hole 40.
The leg portion 1522 may be provided to have a plate shape on a lower surface of the body portion 1521 and located on a lower surface of the composite material reinforcement device 1. In this case, the leg portion 1522 is provided to be larger than the movement hole 40 not to pass through the movement hole 40, and may have a plate form in various shapes such as a circle, a triangle, a quadrilateral, etc., but is not limited thereto.
The movement protrusion 1523 is provided to protrude outward from both side surfaces of the body portion 1521. The movement protrusion 1523 penetrates through the movement hole 40, and then, rotate to be fixed to a lower surface of the composite material reinforcement device 1. In this case, the movement protrusion 1523 may be provided to have a quadrilateral shape as shown in
Hereinafter, an operation of the upward-and-downward movement portion provided as mentioned above is described in detail.
Referring to
In the above-described state, the connection member 30 may be inserted into the partition space S1, and the movement member 152 may be operated as shown in
Hereinafter, a method of constructing a composite material reinforcement device applied to the box-type concrete structure 2 is described in detail.
The construction method for including the composite material reinforcement device 1 according to an embodiment of the present invention relates to a method of constructing the composite material reinforcement device in the box-type concrete structure 2. The construction method includes a device preparation step (S10), a fixing step (S20), and a filling step (S30).
First, the device preparation step (S10) is a step of preparing one or more composite material reinforcement devices 1 to be installed in the box-type concrete structure 2. A specific description of the composite material reinforcement device 1 was described above with respect to the device. Thus, a described description thereof will not be provided again here.
As described above, the composite material reinforcement device 1 may be integrally manufactured by performing molding at a high temperature and under high pressure in a state when the first plate 21 and the second plate 22 cover an upper portion and a lower portion with the central portion 10 arranged at a center and are bonded to each other in the extension portion 23.
At this time, a molding temperature may be 145 to 155° C. and the pressure may be 8 to 10 kgf/cm2. The molding temperature may be, most preferably, 150° C. and the pressure may be 9 kgf/cm2, but are not limited thereto. When the temperature or the pressure is less than the lower limit described above, the composite material reinforcement device 1 may not be properly molded and the central portion 10 may be separated from the reinforcement portion 20. When the temperature or the pressure exceeds the upper limit described above, a problem in durability of the reinforcement portion 20 may occur. Thus, these cases are not desirable.
The fixing step (S20) is a step of fixing the composite material reinforcement device 1 to the box-type concrete structure 2 using an anchor. In detail, in the fixing step (S20), concrete chipping work may be performed on a construction surface and the composite material reinforcement device 1 may be placed in a corresponding location. At this time, the composite material reinforcement device 1 may be positioned in a state when an upper surface of the first plate 21 is in contact with the construction surface. Then, an anchor may be installed to penetrate through the construction surface from a lower surface of the extension portion 23 of the composite material reinforcement device 1. In this case, a plurality of anchors are installed in a portion of the extension of the composite material reinforcement device 1 along a longitudinal direction to firmly fix the composite material reinforcement device 1 to the construction surface.
Then, the filling step (S30) is a step of filling an inner space of the composite material reinforcement device 1 with a reinforcing material. In this case, various materials filled through foaming, such as urethane foam, may be used as the reinforcing material. Strength of the composite material reinforcement device 1 may be increased by filling the partition spaces S1 with the reinforcing agent. Most preferably, according to positions of the partition spaces S1, a central part thereof may be filled with rigid urethane foam having high strength, and both end parts thereof may be filled with light-weight flexible urethane foam. However, the present invention is not limited thereto. As such, strength may be reinforced while a light weight is maintained by using rigid or flexible urethane foam depending on positions of the partition spaces S1.
The construction method of the composite material reinforcement device 1 according to an embodiment of the present invention may further include a bending forming step after the device preparation step (S10).
The bending formation step is a step of bending the composite material reinforcement device 1 with reference to the cutting line 24 to extend the composite material reinforcement device 1 from the corner B to the slab A of the box-type concrete structure 2. A detailed description thereof was provided above, and thus, will not be provided again here.
As such, in the bending forming step, as the composite material reinforcement device 1 bent with reference to the cutting line 24 is positioned sequentially from the slab A to the corner B, an effect of shear reinforcement may be increased.
In addition, the construction method of constructing the composite material reinforcement device 1 according to an embodiment of the present invention may further include a connection step after the device preparation step (S10).
The connection step is a step of inserting the connection member 30 into the partition spaces S1 by connecting a plurality of composite material reinforcement devices to each other in a longitudinal direction to be extended in the longitudinal direction. In detail, in the connection step, the connection member may be coupled between an end of one composite material reinforcement device 1 and an end of another composite material reinforcement device to be inserted into one of partition spaces S1 of the central portion 10 of each of the composite material reinforcement device 1 to thereby allow the composite material reinforcement device 1 to be extended in a longitudinal direction.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. Accordingly, the concept of the present invention must not be confined to the explained embodiments, and the following patent claims as well as everything including variations equal or equivalent to the patent claims pertain to the category of the concept of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0115862 | Aug 2021 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/012064 | 8/12/2022 | WO |
