FIELD OF THE INVENTION
The instant disclosure relates to a beam-column connection structure and a method for forming the same, in particular to a beam-column connection structure of a precast column and a precast steel reinforced concrete beam and a method for forming the same.
BACKGROUND
Conventional methods of constructing reinforced concrete (RC) buildings require construction floor-by-floor from the bottom to the top, which is time consuming. One of such methods involves: pouring concrete into molds having rebar therein at the construction site for construction at the ground floor and waiting until the concrete reaches a predetermined compression strength, then removing the molds and starting the constructing work for the next floor (i.e., the 2nd floor), and so on. Further, such conventional method involves many processes, such as tying the reinforced steel, molding, grouting and so on, which requires a lot of workers on the construction site. Thus, the quality of the construction is dependent on the skill and experience of the workers and the weather, and is difficult to control.
To resolve the above problems, a precast construction method is provided. For example, precast columns and precast beams are first fabricated in the factory, and then transported to the construction site to be hoisted to particular locations. At the construction site, the precast columns and beams are assembled by the steps of: binding the rebar extending from the outer surfaces of the precast columns and the precast beams, assembling the molds around the joints of the precast columns and beams, and pouring concrete into the molds to complete the beam-column connection structure. However, the accuracy of such conventional beam-column connection structure highly depends on the skill and experience of the workers on site. Thus, it is still hard to control construction quality, and it is desirable to reduce the time required further and improve the strength of such beam-column connection. Using steel reinforced concrete (SRC) as load-bearing beams and columns may expedite the construction process. However, if SRC is comprehensively used in the load-bearing beams and columns, it will require a great amount of steel, resulting in high construction cost. Thus, a combination of precast columns and SRC in a construction is one of the preferred designs.
Given the above, it is desired to provide a beam-column connection structure with stronger structural strength and to provide a construction method that can rapidly assemble a precast column and a precast steel reinforced concrete beam.
SUMMARY OF THE INVENTION
According to one exemplary embodiment of the instant disclosure, a beam-column connection structure comprises a precast column, a precast steel reinforced concrete beam and a plurality of fasteners. The precast column comprises a plurality of tension bars horizontally embedded in the precast column and an engagement assembly, wherein one side of the engagement assembly is connected with a first end of the plurality of tension bars, and the other side of the engagement assembly has a plurality of second through holes. The precast steel reinforced concrete beam has a plurality of first through holes at an end of the precast steel reinforced concrete beam, wherein the plurality of first through holes corresponds to the plurality of second through holes. The plurality of fasteners are penetrated through the plurality of first and second through holes so that the precast steel reinforced concrete beam is fixed to the precast column.
According to another exemplary embodiment of the instant disclosure, a method for beam-column connection comprises: providing a precast column comprising a plurality of tension bars horizontally embedded in the precast column; providing an engagement assembly; connecting one side of the engagement assembly with a first end of the plurality of tension bars, wherein the other side of the engagement assembly has a plurality of second through holes; providing a precast steel reinforced concrete beam, an end of the precast steel reinforced concrete beam having a plurality of first through holes corresponding to the plurality of second through holes; and penetrating a plurality of fasteners through the plurality of first and second through holes so that the precast steel reinforced concrete beam is fixed to the precast column.
According to another exemplary embodiment of the instant disclosure, a method for beam-column connection comprises: providing a precast column comprising a plurality of first and second tension bars horizontally embedded in the precast column, wherein the plurality of second tension bars substantially perpendicularly intersect with the plurality of first tension bars; providing a first engagement assembly, wherein one side of the first engagement assembly connecting with a first end of the plurality of first tension bars, and the other side of the first engagement assembly having a plurality of second through holes; providing a second engagement assembly, wherein one side of the second engagement assembly connects with the first end of the plurality of second tension bars, and the other side of the second engagement assembly having a plurality of third through holes; providing a first and a second precast steel reinforced concrete beam, wherein an end of each the first and second precast steel reinforced concrete beams has a plurality of first through holes corresponding to the plurality of second through holes and the plurality of third through holes; and penetrating a plurality of fasteners through the plurality of first through holes and the plurality of second through holes and through the plurality of first through holes and the plurality of third through holes so that the first and second precast steel reinforced concrete beams are fixed to two adjacent sides of the precast column.
In order to further understand the instant disclosure, the following embodiments are provided along with illustrations to facilitate appreciation of the instant disclosure; however, the appended drawings are merely provided for reference and illustration and are not intended to be used for limiting the scope of the instant disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described according to the appended drawings, in which:
FIG. 1A is a schematic view showing the inner structure of a precast column with an engagement assembly in accordance with a preferable embodiment of the instant disclosure;
FIG. 1B is a schematic view showing the structure of the precast column with the engagement assembly in accordance with another preferable embodiment of the instant disclosure;
FIG. 2A is a schematic view showing the structure of a precast steel reinforced concrete beam in accordance with a preferable embodiment of the instant disclosure;
FIG. 2B is a schematic view showing the structure of a precast steel reinforced concrete beam in accordance with another preferable embodiment of the instant disclosure;
FIGS. 3A-3F are schematic views showing the steps of fixing the precast steel reinforced concrete beam to the precast column and disposing the floorslab in accordance with a preferable embodiment of the instant disclosure; and
FIGS. 4A-4F are schematic views showing the steps of fixing the precast steel reinforced concrete beam to the precast column and disposing the floorslab in accordance with another preferable embodiment of the instant disclosure.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In order to facilitate understanding of the technical features, technical contents, technical advantages and technical effects of the subject invention, a detailed description with accompanying drawings is provided below for explanation only. The drawings only serve an auxiliary purpose for understanding of the technical contents; the scope of the subject invention should not be interpreted merely based on the scale or the relative positions between the elements illustrated in the drawings.
The terminology used in the description of the present disclosure herein is for the purpose of describing particular embodiments only, and is not intended to be construed as a limitation of the invention. As used in the description of the invention and the appended claims, the singular articles “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term “and/or” as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms “includes,” “including,” “comprises,” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
FIG. 1A is a schematic view showing the internal structure of a precast column with an engagement assembly in accordance with a preferable embodiment of the instant disclosure. The precast column 1 comprises a main rebar assembly 11 and a stirrup assembly 12 fixedly coupled to the main rebar assembly 11. In an embodiment of the instant disclosure, the stirrup assembly 12 is a spiral stirrup assembly, and comprises a main spiral stirrup 121 and a plurality of auxiliary spiral stirrups 122. In the embodiment shown in FIG. 1A, the precast column 1 comprises four auxiliary spiral stirrups 122 respectively arranged outside the four corners of the main spiral stirrup 121. In particular, the four auxiliary spiral stirrups 122 are symmetrically arranged outside the four corners of the main spiral stirrup 121, respectively. The auxiliary spiral stirrups 122 partially extend inside the main spiral stirrup 121. That is, each of the auxiliary spiral stirrups 122 partially overlaps the main spiral stirrup 121 and a major part of the auxiliary spiral stirrups 122 is disposed outside the main spiral stirrup 121. In the embodiment shown in FIG. 1A, the main spiral stirrup 121 and the auxiliary spiral stirrups 122 have a substantially circular shape. In another embodiment of the instant disclosure, the main spiral stirrup 121 and the auxiliary spiral stirrups 122 can be provided with an alternative shape, such as oval or square, based on practical needs.
In addition, the main rebar assembly 11 comprises a plurality of main rebar 111, 112, 113 inserted inside and fixedly coupled to the auxiliary spiral stirrups 122 and/or the main spiral stirrup 121 binding with thin metal wires or through welding. In the embodiment shown in FIG. 1A, the main rebar assembly 11 comprises at least one middle main rebar 112 and a plurality of outer main rebar 113. The middle main rebar 112 is disposed between and fixedly coupled to the main spiral stirrup 121 and the auxiliary spiral stirrup 122. The outer main rebar 113 are disposed outside of the main spiral stirrup 121 and inside of the auxiliary spiral stirrup 122, and fixedly coupled to the auxiliary spiral stirrup 122. Moreover, based on practical needs, the main rebar assembly 11 further comprises an inner main rebar 111 fixedly coupled to the inner side of the main spiral stirrup 121 so that the main spiral stirrup 121 surrounds and is fixedly coupled to the outside of the inner main rebar 111.
As illustrated in FIG. 1A, at the first position A and the second position B of the precast column 1, the precast column 1 comprises a plurality of tension bars 13 horizontally embedded in the precast column 1. The tension bars 13 are embedded and positioned to cross the whole length or the whole width of a horizontal cross section of the precast column 1. At least one end (or both ends) of each of the tension bars 13 is connected with an engagement assembly 4. In an embodiment of the instant disclosure, the first end of the tension bars 13 are connected with the inner surface of the engagement assembly 4 through welding. In another embodiment of the instant disclosure, the first end of the tension bars 13 comprise a coupling structure, such as a sleeve 133 with a threaded hole, so a bolt (not shown in figures) penetrates through the engagement assembly 4 and is fixedly coupled with the sleeve 133 at the first end of the tension bars 13. In addition, the distribution of the tension bars 13 is determined based on the size of the engagement assembly 4. In an embodiment of the instant disclosure, the distance of the tension bars 13 between the first position A and the second position B is substantially identical to the height H1 of the engagement assembly 4, so that the tension bars 13 at the first position A and the second position B are respectively connected to the upper end and lower end of the engagement assembly 4, wherein the first position A is higher than the second position B. In another embodiment of the instant disclosure, between the first position A and the second position B, it can be further provided with additional tension bars 13 to enhance the strength of the structure.
As shown in FIG. 1A, the precast column 1 after grouting and molding, forms a column with a square cross section. The first surface 14 and the second surface 15, of the precast column 1 connect with different precast steel reinforced concrete beams 2. The plurality of tension bars 13 comprises a plurality of first tension bars 131 and a plurality of second tension bars 132 substantially perpendicularly intersecting the plurality of first tension bars 131. The plurality of first tension bars 131 are horizontally disposed on the first horizontal plane P1, and the plurality of second tension bars 132 are horizontally disposed on the second horizontal plane P2, wherein the first horizontal plane P1 is lower than the second horizontal plane P2 such that the plurality of first tension bars 131 at the first position A and the second position B are respectively below the corresponding plurality of second tension bars 132. In addition, in an embodiment of the instant disclosure, the length of the plurality of tension bars 13 is slightly shorter than the length or width of the cross section of the precast column 1. For example, at least one end of the plurality of tension bars 13 is internally apart from the outer surface of the precast column 1 with a dimension of about the thickness Ti of the engagement assembly 4 so that the outer surface of the precast column 1, after grouting and molding, is flush with the outer surface of the engagement assembly 4.
The outer surface of the engagement assembly 4 is provided with a protrusion 41 substantially perpendicularly extending from the outer surface of the engagement assembly 4. The protrusion 41 has a plurality of second through holes 411 for connecting one end of the precast steel reinforced concrete beam 2. In particular, the number and the distribution of the plurality of second through holes 411 of the protrusion 41 correspond to those of the plurality of first through holes 214 of the precast steel reinforced concrete beam 2 (see FIGS. 3A and 4A). In the embodiment shown in FIG. 1A, the protrusion 41 is elongated, and has the plurality of second through holes 411 (e.g., seven through holes) substantially linearly arranged along the protrusion 41. To avoid uneven stress distribution, the second through holes 411 are designed so that the distance between the second through holes 411 is substantially identical. In addition, the lower end of the outer surface of the engagement assembly 4 is provided with an elongated spacer 42 which can be used for positioning the precast steel reinforced concrete beam 2 and limiting the flow range of the solder.
FIG. 1B is a schematic view showing the structure of the precast column with the engagement assembly in accordance with another preferable embodiment of the instant disclosure. In the embodiment shown in FIG. 1B, the engagement assembly 4 further comprises a first engagement member 43 and a second engagement member 44. The first engagement member 43 connects with the first end of the plurality of tension bars 13 at the first position A, and the second engagement member 44 connects with the first end of the plurality of tension bars 13 at the second position B. In an embodiment of the instant disclosure, the first engagement member 43 and the second engagement member 44 respectively connect with the first end of the plurality of tension bars 13 at the first position A and the second position B through welding. In another embodiment of the instant disclosure, bolts (not shown in figures) penetrate through the first engagement member 43 and the second engagement member 44 in a direction toward the precast column 1 to be coupled with the sleeves 133 at the first end of the plurality tension bars 13 at the first position A and the second position B so that the first engagement member 43 and the second engagement member 44 respectively connect to the first end of the plurality of tension bars 13 at the first position A and the second position B. The first engagement member 43 and the second engagement member 44 are arranged substantially parallel to each other so as to correspond to the plurality of tension bars 13 horizontally arranged. The distance between the first engagement member 43 and the second engagement member 44 corresponds to the height H1 of the engagement assembly 4, so that the outer surface of the first engagement member 43 and that of the second engagement member 44 respectively connect with the upper end and the lower end of the inner surface of the engagement assembly 4. In an embodiment of the instant disclosure, the outer surface of the first engagement member 43 and that of the second engagement member 44 respectively connect with the inner surface of the upper end and the lower end of the engagement assembly 4 through welding. In addition, the lower end of the outer surface of the second engagement member 44 is provided with a spacer 441 which is used for positioning the engagement assembly 4 and limiting the flow range of solder. In another embodiment of the instant disclosure, bolts (not shown in figures) penetrate through the engagement assembly 4 so that the engagement assembly 4 connects with the first engagement member 43 and the second engagement member 44.
Please refer to FIGS. 2A-2B. FIG. 2A is a schematic view showing the structure of a precast steel reinforced concrete beam in accordance with a preferable embodiment of the instant disclosure. FIG. 2B is a schematic view showing the structure of the precast steel reinforced concrete beam in accordance with another preferable embodiment of the instant disclosure. The precast steel reinforced concrete beam 2 comprises a steel beam 21 therein. The steel beam 21 comprises a top flange 211, a bottom flange 212 and a web plate 213, wherein the bottom flange 212 is substantially parallel to the top flange 211, and the upper end and the lower end of the web plate 213 are substantially perpendicularly connected to the top flange 211 and the bottom flange 212, respectively. In order to enhance the connection between the steel beam 21 and the concrete to be applied thereto, the outer surface of the steel beam 21 is provided with a plurality of shear studs 25. In the embodiment shown in FIG. 2A, the plurality of shear studs 25 is provided on the top surface of the top flange 211. In addition, at least one end of the precast steel reinforced concrete beam 2 has a plurality of first through holes 214 for connecting to the engagement assembly 4 of the precast column 1. The number and distribution of the plurality of first through holes 214 correspond to those of the plurality of through holes 411 of the engagement assembly 4. In the embodiments shown in FIGS. 2A and 2B, the plurality of first through holes 214 (e.g., seven through holes) are linearly disposed on the web plate 213 of the steel beam 21 along the edge of the end of the precast steel reinforced concrete beam 2.
As illustrated in FIGS. 2A and 2B, a section 23 of the steel beam 21 is partially or completely enveloped by reinforced concrete so that at least one end of the precast steel reinforced concrete beam 2 is a bare steel beam section 22 with a predetermined length, and the section 23 is next to the bare steel beam section 22. In the section 23, the outer surface of the steel beam 21 is wrapped by a plurality of first rebar at a predetermined distance, and is partially grouted and molded so that the precast steel reinforced concrete beam 2 is not easily susceptible to temperature. In the embodiment shown in FIG. 2A, the left side, right side and bottom side but not the top side of the steel beam 21 is grouted and molded, which is called a semi-precast steel reinforced concrete beam. In the embodiment shown in FIG. 2B, the whole outer surface of the steel beam 21 is grouted and molded, which is called a total precast steel reinforced concrete beam. In addition, in the embodiment shown in FIG. 2B, at least one lateral surface of two opposite lateral surfaces of the precast steel reinforced concrete beam 2 has a plurality of side rebar 26 and a support bar 27. The support bar 27 is used for supporting a floor structure, such as the corrugated steel sheets serving as the bottom of the floorslab. The side rebar 26 can be further combined with other rebar to form the rebar structure for the formation of the floorslab.
In a preferred embodiment, the structural body of the precast column 1 and the precast steel reinforced concrete beam 2 are manufactured in the precast factory according to the construction blueprints. After the concrete of the precast column 1 and the precast steel reinforced concrete beam 2 reaches a predetermined rigidity, the precast column 1 and the precast steel reinforced concrete beam 2 are transported to the construction site for assembly. FIGS. 3A-3F are schematic views showing the steps of fixing the precast steel reinforced concrete beam 2 (i.e., a semi-precast steel reinforced concrete beam) to the precast column 1 and disposing the floorslab in accordance with a preferable embodiment of the instant disclosure. FIGS. 4A-4F are schematic views showing the steps of fixing the precast steel reinforced concrete beam 2 (i.e., a total precast steel reinforced concrete beam) to the precast column 1 and disposing the floorslab in accordance with another preferable embodiment of the instant disclosure.
Please refer to FIGS. 3A-3F and FIGS. 4A-4F. In step S1, providing a precast column 1 with an engagement assembly 4. The engagement assembly 4 has a plurality of second through holes 411 for connecting with one end of the precast steel reinforced concrete beam 2. At the construction site, the precast column 1 is hoisted and positioned to the predetermined position (see FIGS. 3A and 4A).
In step S2, at least one precast steel reinforced concrete beam 2 is provided with a plurality of first through holes 214 at one end of the precast steel reinforced concrete beam 2. A crane (not shown in figures) hoists the precast steel reinforced concrete beam 2 to a position adjacent to the precast column 1 for connecting the precast steel reinforced concrete beam 2 to a predetermined position of the precast column 1. In an alternative embodiment, a plurality of precast steel reinforced concrete beams 2 can be connected to different sides of the precast column 1 simultaneously or sequentially.
In step S3, the position of the precast steel reinforced concrete beam 2 is adjusted. After the plurality of through holes 214 of the precast steel reinforced concrete beam 2 are aligned with the plurality of second through holes 411 of the engagement assembly 4, a plurality of fasteners 3 are penetrated through the plurality of first through holes 214 of the precast steel reinforced concrete beam 2 and the plurality of second through holes 411 of the engagement assembly 4 so that the precast steel reinforced concrete beam 2 is fixed to the precast column 1. In addition, the fastener 3 comprises a bolt and corresponding nut. The threaded end of the bolts penetrates through the plurality of first through holes 214 of the precast steel reinforced concrete beam 2, and then penetrates through the plurality of second through holes 411 of the engagement assembly 4, so the threaded end is exposed outside the surface of the engagement assembly 4. In addition, the position of the spacer 42 is so designed that when the plurality of first through holes 214 of the precast steel reinforced concrete beam 2 are aligned with the plurality of second through holes 411 of the engagement assembly 4, the upper surface of the spacer 42 is attached to the lower surface of the bottom flange 212 of the steel beam 21 (see FIGS. 3B and 4B).
In step S4, the precast steel reinforced concrete beam 2 is welded to the engagement assembly 4 to enhance the connection strength. The top flange 211 and the bottom flange 212 of the steel beam 21 of the precast steel reinforced concrete beam 2 are welded to the outer surface of the engagement assembly 4, and the web plate 213 of the steel beam 21 is welded to the protrusion 41 of the engagement assembly 4. After the precast steel reinforced concrete beam 2 is positioned, the spacer 43 is attached to the lower surface of the bottom flange 212 of the steel beam 21. In addition, the lower surface of the top flange 211 of the steel beam 21 is provided with a spacer 48 for limiting the flow range of the solder. Because the height H3 of the web plate 213 is greater than the height H2 of the protrusion 41, the web plate 213 can be welded to the outer periphery of the protrusion 41, such as along the top edge, outer edge and bottom edge of the protrusion 41 (see FIGS. 3B and 4B). In another embodiment of the instant disclosure, step S4 can be omitted.
In step S5, in the bare steel beam section 22 of the precast steel reinforced concrete beam 2, wrapping a plurality of first rebar 24 around the steel beam 21. In addition, at least one surface of two lateral surfaces of the bare steel beam section 22 of the precast steel reinforced concrete beam 2 is further provided with at least one third rebar 241 substantially perpendicularly intersecting with the first rebar 24 (see FIGS. 3C and 4C).
In step S6, the bare steel beam section 22 of the precast steel reinforced concrete beam 2 is enclosed by concrete forms 29 and into which concrete is then poured. The concrete form 29 comprises an outer concrete form 291, an inner concrete form 292 and a bottom concrete form 293 disposed on the outer surface, inner surface and bottom surface of the bare steel beam section 22 of the precast steel reinforced concrete beam 2, respectively. In particular, there is a height difference between the top edge 2911 of the outer concrete form 291 and the top edge 2921 of the inner concrete form 292. In an embodiment of the instant disclosure, the top edge 2911 of the outer concrete form 291 is higher than the top edge 2921 of the inner concrete form 292. In an embodiment shown in FIG. 3D, the top edge 2921 of the inner concrete form 292 and the top edge 231 of the lateral surface in the section 23 of the precast steel reinforced concrete beam 2 are substantially at the same level. In an embodiment shown in FIG. 4D, the top edge 2921 of the inner concrete form 292 is located between the support bar 26 and the top edge 271 of the side rebar 27. In another embodiment of the instant disclosure, the top edge 2921 of the inner concrete form 292 and the top edge 271 of the side rebar 27 are substantially at the same level.
In step S7, a plate member 5 (i.e., the corrugated steel sheets serving as the bottom of the floorslab) is horizontally disposed and surrounded by the precast column 1 and the at least one precast steel reinforced concrete beam 2, and a plurality of second rebar 6 perpendicularly intersect with each other on the plate member 5. In an embodiment shown in FIG. 3E, the edge of the bottom surface 51 of the plate member 5 is fixedly coupled to the top edge 231 in the section 23 of the precast steel reinforced concrete beam 2 and the top edge 2921 of the inner concrete form 292 of the bare steel beam section 22. In addition, while the plurality of second rebar 6 perpendicularly intersect with each other on the plate member 5, a part of the second rebar 6 can extend over the edge of the plate member 5 and extend above the top surface of the precast steel reinforced concrete beam 2. In an embodiment shown in FIG. 4E, the bottom surface of the plate member 5 is supported by the top of the support bar 27. The rebar 6 disposed on the plate member 5 can be further combined with the side rebar 26 of the precast steel reinforced concrete beam 2.
In step S8, concrete is poured onto the area not previously enveloped by concrete. When the precast steel reinforced concrete beam 2 is a semi-precast steel reinforced concrete beam (as shown in FIG. 3F), concrete 7 is poured onto the top surface of the precast steel reinforced concrete beam 2 in addition to the top surface of the plate member 5. Moreover, concrete 7 can also be poured onto the top surface of the precast steel reinforced concrete beam 2 in step S7. When the precast steel reinforced concrete beam 2 is a total precast steel reinforced concrete beam (as shown in FIG. 4F), concrete 7 is poured only onto the top surface of bare steel beam section 22.
The beam-column connection structure and the method of forming the same as provided in the above embodiments effectively speed up the connections between the precast columns and the precast beams so that the main structure of the building can be rapidly accomplished. Moreover, the tension bars embedded in the precast column not only enhance the structural strength of the precast beams coupled to both ends of each tension bar, but also effectively transmit the shear force resulting from earthquakes so as to prevent the beam-column connection structure from being damaged due to the unfavorable stress concentration phenomenon.
Specific components of an insertion system and related methods for insertion have been described. It should be apparent, however, to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the present disclosure. Moreover, in interpreting the present disclosure, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced.
Patent Application
20190226210
