Building construction method and building structure

Abstract

To provide a building construction method and a building structure which can stably hold a main reinforcement on a beam arranged on a steel pipe serving as a column, while concrete is placed in the steel pipe.SOLUTION: A building construction method includes the steps of: inserting a plurality of main reinforcements 13 into a steel pipe 11 before concrete is placed, from an upper side in an extension direction of the steel pipe 11 so as to be prevented from abutting on a beam 2; and receiving bundle reinforcements 14A bundling the whole of the plurality of main reinforcements 13 by four bundling reinforcement receivers 21 fixed to the beam 2, when inserting the plurality of main reinforcements 13, and supporting the plurality of main reinforcements 13.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a construction method and building structure for a building in which columns are made of reinforced concrete (RC construction) and beams are made of steel (S construction). [Background technology]

[0002] Patent Document 1 discloses a joint structure between a column and a steel-framed beam using a concrete pipe. In this joint structure, the column includes a fiber-reinforced concrete pipe formed from fiber-reinforced concrete, which is made by mixing a plurality of fibers into an unhardened concrete material, a plurality of connecting reinforcing bars arranged inside the fiber-reinforced concrete pipe and extending vertically, a plugging member having approximately the same external shape as the fiber-reinforced concrete pipe, arranged at the joint between the column and the beam and communicating with the fiber-reinforced concrete pipe, and concrete filled inside the fiber-reinforced concrete pipe and inside the plugging member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-106051 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned Patent Document 1 does not disclose a method for stably supporting the connecting reinforcing bars on a cross-shaped beam placed on the column until concrete is poured into the column.

[0005] An object of the present invention is to provide a building construction method and building structure that can stably support main reinforcement on beams placed on steel pipes that will serve as columns until concrete is poured into the steel pipes. [Means for solving the problem]

[0006] In order to solve the above problems, the construction method of a building of this invention is a construction method of a building in which the columns are made of reinforced concrete in which concrete is filled in steel pipes and a plurality of main reinforcements that are long in the extension direction of the steel pipes are arranged at the column-beam joints, and the beams are made of steel, a step of inserting the plurality of main reinforcements into the steel pipe from above in the extension direction of the steel pipe before concrete is poured, in an arrangement such that the main reinforcements do not come into contact with the beam; a step of receiving the bundled reinforcements bundling all or part of the plurality of main reinforcements with a plurality of bundled reinforcement holders fixed to the beam when the plurality of main reinforcements are inserted, thereby supporting the plurality of main reinforcements; The present invention is characterized by comprising:

[0007] With the above construction method, the bundling bars are received by the bundling bar receiver fixed to the beam, and the main reinforcement is supported, so that the main reinforcement can be stably supported by the bundling bar receiver until concrete is poured into the steel pipe.

[0008] The bundling reinforcing bar support may be fixed on the upper surface side of the beam at a position lower than the upper end surface, and may support the bundling reinforcing bar wound around the entirety of the plurality of main reinforcements.

[0009] Alternatively, the bundling bar support may be fixed on the underside of the beam at a position above the lower end surface, and may support bundling bars that bundle together each of the multiple main bars that have been divided into multiple parts.

[0010] The bundling bar receiver may receive the bundling bar via an intervening member.

[0011] The interposing member may include a fixing portion that contacts and is fixed to the binding bar, and a hooking portion that is supported by the fixing portion and onto which the binding bar receiver is hooked.

[0012] The fixing portion may be provided in the vicinity of a location where one of the main reinforcements and the bundling reinforcement intersect, and the fixing portion may be fastened to the main reinforcement by a linear member.

[0013] The fixing portion may have a notch that receives the linear member.

[0014] The building structure of the present invention is a building structure in which the columns are made of reinforced concrete in which concrete is filled in steel pipes and a plurality of main reinforcements that are long in the extension direction of the steel pipes are arranged at the column-beam joints, and the beams are made of steel, The plurality of main reinforcements are inserted into the steel pipe in an arrangement that does not contact the beam, and the bundling bars bundling the plurality of main reinforcements are received by a plurality of bundling bar receivers fixed to the beam, and the concrete is filled in.

[0015] The binding bar may be received by the binding bar receiver via an intervening member. [Effects of the Invention]

[0016] According to the present invention, the bundled reinforcement bars are received by the bundled reinforcement holders fixed to the beams, and the main reinforcement bars are supported, so that the main reinforcement bars can be stably supported by the bundled reinforcement holders until concrete is poured into the steel pipe. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is an explanatory diagram showing an outline of a building structure according to an embodiment; [Figure 2] FIG. 2 is an explanatory diagram showing a construction method for constructing the building structure shown in FIG. [Figure 3] 2 is an enlarged explanatory view showing a cross section taken along the line AA in FIG. 1. [Figure 4] FIG. 10 is an explanatory diagram showing a construction method according to another embodiment. [Figure 5] 5 is an enlarged explanatory view showing a cross section taken along the arrow BB in FIG. 4. [Figure 6]10A and 10B are diagrams showing an example in which a binding bar is received by a binding bar receiver via an intervening member, in which FIG. 10A is a partial front view and FIG. 10B is a partial side view. [Figure 7] 1A and 1B are explanatory views each showing a state in which a linear member is passed through a notch in the fixing portion of the intervening member. [Figure 8] 10A and 10B are diagrams showing another example in which a binding bar is received by a binding bar receiver via an intervening member, in which FIG. 10A is a partial front view and FIG. 10B is a partial side view. [Figure 9] 10A and 10B are diagrams showing another example in which a binding bar is received by a binding bar receiver via an intervening member, in which FIG. 10A is a partial front view and FIG. 10B is a partial side view. [Figure 10] 10A and 10B are diagrams showing another example in which a binding bar is received by a binding bar receiver via an intervening member, in which FIG. 10A is a partial front view and FIG. 10B is a partial side view. [Figure 11] 7 is an enlarged explanatory view showing a cross section corresponding to the cross section shown in FIG. 3 in an example in which the binding bars of FIG. 6 are received by binding bar receivers via intervening members. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of the present invention will now be described with reference to the accompanying drawings. As shown in FIG. 1 , in this embodiment, the building structure has columns 1 made of reinforced concrete, in which round steel pipes 11 are filled with concrete 12 and multiple main reinforcements 13 extending in the direction of extension of the steel pipes 11 are arranged at beam-column joints 3. The beams 2 are made of steel, such as H-shaped steel. In this building structure, columns 1 are made of concrete-filled steel tube (CFT) columns. By installing multiple main reinforcements 13 at the head and base of the columns, ensuring a predetermined anchorage length, the head and base are made of reinforced concrete (RC) construction, and the central portion of the column is a CFT column with a reduced steel pipe thickness. Hereinafter, the extension direction of column 1 is referred to as the Z direction, one horizontal direction perpendicular to the Z direction as the X direction, and the other horizontal direction perpendicular to the X direction as the Y direction.

[0019] At the beam-column joint 3, there is a closing section 31 formed by welding a round steel pipe of the same diameter as the round steel pipe 11 to close the space from the underside of the upper flange of the beam 2 to the upper surface of the lower flange. Concrete 12 is also filled into this closing section 31.

[0020] In constructing the above-mentioned building structure, for example, as shown in Fig. 2, a structure consisting of a cross-shaped beam 2 (extending in the X and Y directions) forming a beam-column joint 3 and a cover part 31 is placed on a steel pipe 11 before concrete is poured, and each end side of this structure is joined to the end of another beam (not shown). Note that before joining to the end of another beam, the beam-column joint 3 may be supported by shoring (not shown) or by bracing rods protruding from the periphery of the steel pipe 11.

[0021] Then, before concrete is poured, multiple main reinforcements 13 are inserted into the steel pipe 11 from above in the extension direction (Z direction) of the steel pipe 11 in an arrangement that does not hit the beam 2. For example, the number of main reinforcements 13 is 16, and the main reinforcements 13 are divided into groups of four and inserted into the four fan-shaped spaces formed in the closing section 31 formed by the cross-shaped section of the beam 2 at the beam-column joint 3. In the upper part of the main reinforcements 13 that does not enter the fan-shaped spaces, all 16 main reinforcements 13 are bundled together by welding to circular bundling reinforcements 14A. The bundling reinforcements 14A prevent the main reinforcements 13 from bulging.

[0022] Next, the lower bundling bars 14A of the circular bundling bars 14A that bundle all of the main reinforcements 13 are received by four bundling bar receivers 21 fixed to the beam 2 when the 16 main reinforcements 13 are inserted, and these 16 main reinforcements 13 are supported by the four bundling bar receivers 21.

[0023] The bundling bar holder 21 is made of, for example, a round steel bar or a square steel bar, and its base side is welded to the upper surface (upper flange) of the beam 2 extending in the X direction, at a position lower than the upper end surface (under the upper flange). A part of the base side of the bundling bar holder 21 enters the covering part 31, and this part that enters the covering part 31 bends diagonally upward with Y-direction components and Z-direction components, and further extends in the X direction (towards the cross part of the beam 2), and this part extending in the X direction hooks the bundling bar 14A.

[0024] According to the above-described building construction method, the circular bundling bars 14A that bundle all of the main reinforcements 13 are received by the bundling bar receivers 21 fixed to the beams 2, thereby supporting the main reinforcements 13. Therefore, the main reinforcements 13 can be stably supported by the bundling bar receivers 21 until the concrete 12 is poured into the steel pipes 11.

[0025] In the above construction method, the circular bundling bars 14A that bundle all of the main reinforcements 13 are supported by the bundling bar support 21 fixed to the upper flange side of the beam 2, but the construction method is not limited to this.

[0026] 4 and 5, the base sides of four bundling bar holders 21 may be welded and fixed to the underside (bottom flange) of the beam 2 extending in the X direction, at a position above the bottom end surface (top surface of the bottom flange), and each of the arc-shaped bundling bars 14B bundling four main reinforcements 13 at a position below the bundling bars 14A may be hooked onto each bundling bar holder 21. In this construction example, too, a portion of the base side of each bundling bar holder 21 enters the covering portion 31, and the portion within this covering portion 31 bends diagonally downward having Y-direction and Z-direction components and further extends in the X direction (towards the cross portion of the beam 2), and the bundling bars 14B are hooked by this portion extending in the X direction. Furthermore, if each bundling bar 14B is hooked onto each bundling bar support 21 and the bundling bar 14A is supported on the upper surface of the cross section of the beam 2, the main reinforcement 13 can be supported more stably.

[0027] In these construction examples, the bundling bars 14A or 14B are directly supported by the bundling bar support 21 fixed to the beam 2, but the present invention is not limited to such a direct support method.

[0028] For example, as shown in Figures 6(A), 6(B), and 11, the bundling bar receiver 21 may receive the bundling bars 14A (14B) via an interposition member 5. The interposition member 5 includes a fixing portion 51 made of a substantially rectangular plate material that comes into contact with and is fixed to the bundling bars 14A (14B), and a hooking portion 52 that is supported by the fixing portion 51 and onto which the bundling bar receiver 21 is hooked. The hooking portion 52 is formed by bending a rebar into a square shape, with the lower side supported by the fixing portion 51 by welding and the upper side separated from the fixing portion 51. The bundling bar receiver 21 hooks onto the upper side of the square-shaped rebar at the hooking portion 52.

[0029] The worker places the fixing part 51 at a position where it contacts the bundling reinforcing bars 14A (14B) at the intersection of one main reinforcing bar 13 and the bundling reinforcing bars 14A (14B). Then, the worker fastens the fixing part 51 to the main reinforcing bars 13 by tying it with a linear member 53 such as a wire. This fastening can be performed before the main reinforcing bars 13 are inserted into the steel pipe 11.

[0030] As shown in Figures 7(A) and 7(B), the fixing part 51 has notches 51a at four corners through which the linear members 53 are passed. The intersections of the linear members 53 passed through these four notches 51a may or may not coincide with the hooking positions of the tips of the binding reinforcing bars 21. Alternatively, the fixing part 51 may be fastened to the main reinforcing bars 13 and the binding reinforcing bars 14A (14B) by the linear members 53 with the upper edge of the fixing part 51 placed against, for example, the lower surface of the binding reinforcing bar 14A (14B) at the intersection of the main reinforcing bars 13 and the binding reinforcing bars 14A (14B). The depth (size) of the notches 51a may be such that the linear members 53 can be passed through multiple times.

[0031] In the above construction example, the bundling bars 14A (14B) are positioned on an extension of the hooking position of the tip of the bundling bar holder 21, but this is not limited to this. For example, as shown in Figures 8(A) and 8(B), the bundling bars 14A (14B) may be positioned above or below the extension of the hooking position of the tip of the bundling bar holder 21. Also, as shown in Figures 9(A) and 9(B), bent portions 51b that can come into contact with the main reinforcements 13 may be formed on the upper and lower sides of the fixing part 51, and by bringing these bent portions 51b into contact with the main reinforcements 13, the fixing part 51 can be stably fastened by the linear members 53.

[0032] Furthermore, the above-mentioned intervening member 5 comprises a fixed portion 51 made of a substantially rectangular plate material and a hook portion 52 formed by bending a reinforcing bar into a square shape, but as shown in Figures 10(A) and 10(B), it is also possible to use a single substantially rectangular plate material and form the fixed portion 51 and the hook portion 52 by bending and punching an opening.

[0033] Furthermore, by making the bent portion of the bundling bar holder 21 contact the inner surface of the steel pipe 11, it is possible to guide and position the column-beam joint 3 when placing it on the steel pipe 11, or to guide and position the next steel pipe 11 when it is fitted onto the column-beam joint 3.

[0034] The structure of a building constructed using the construction method described above is one in which the columns 1 are made of reinforced concrete, with concrete 12 filled in the steel pipes 11 and multiple main reinforcements 13 arranged in the column-beam joints 3 in the direction of extension of the steel pipes 11, and the beams 2 are made of steel. The multiple main reinforcements 13 are inserted into the steel pipes 11 in a position that does not contact the beams 2, and the bundling bars 14A (14B) bundling the multiple main reinforcements 13 are supported by multiple bundling bar holders 21 fixed to the beams 2, and the structure is filled with concrete 12. The bundling bars 14A (14B) may be supported by the bundling bar holders 21 via intervening members 5.

[0035] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0036] 1: Pillar 2:Beam 3: Column beam joint 5:Intervening member 11: Steel pipe 12: Concrete 13:Main reinforcement 14A: Bundling 14B: Bundle muscles 21: Bundle brace 31: Blocking section 51:Fixed part 51a: Notch 51b: Bent section 52: Hook 53: Linear member

Claims

1. A construction method for a building in which the columns are made of reinforced concrete in which concrete is filled in steel pipes and a plurality of main reinforcements that are long in the extension direction of the steel pipes are arranged at the column-beam joints, and the beams are made of steel, a step of inserting the plurality of main reinforcements into the steel pipe from above in the extension direction of the steel pipe before concrete is poured, in an arrangement such that the main reinforcements do not come into contact with the beam; a step of receiving the bundled reinforcements bundling all or part of the plurality of main reinforcements with a plurality of bundled reinforcement holders fixed to the beam when the plurality of main reinforcements are inserted, thereby supporting the plurality of main reinforcements; A building construction method comprising:

2. 2. The building construction method according to claim 1, wherein the bundling reinforcing bars are fixed to the upper surface of the beam at a position lower than the upper end surface, and receive the bundling reinforcing bars wound around the entirety of the plurality of main reinforcements.

3. 2. The building construction method according to claim 1, wherein the bundling reinforcing bars are fixed to the underside of the beam at a position above the lower end surface, and receive bundling reinforcing bars that bundle together each of the plurality of main reinforcing bars divided into a plurality of parts.

4. 4. The building construction method according to claim 1, wherein the bundling bar support receives the bundling bar via an intervening member.

5. 5. The building construction method according to claim 4, wherein the intervening member has a fixed portion that contacts and is fixed to the binding bar, and a hook portion that is supported by the fixed portion and onto which the binding bar holder is hooked.

6. 6. The building construction method according to claim 5, wherein the fixing portion is provided in the vicinity of a point where one of the main reinforcement bars and the bundling reinforcement bars intersect, and the fixing portion is fastened to the main reinforcement bar by a linear member.

7. 7. A building construction method according to claim 6, wherein the fixing portion has a notch portion for receiving the linear member.

8. A building structure in which the columns are made of reinforced concrete with concrete filled in steel pipes and a plurality of main reinforcements long in the extension direction of the steel pipes at the column-beam joints, and the beams are made of steel, A building structure characterized in that the plurality of main reinforcements are inserted into the steel pipe in an arrangement that does not contact the beam, and the bundling bars bundling the plurality of main reinforcements are supported by a plurality of bundling bar holders fixed to the beam, and the concrete is filled in.

9. 9. The building structure according to claim 8, wherein the bundling bars are supported by the bundling bar support via an intervening member.

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