Joint structure

Abstract

To provide a joint structure in which the arrangement of reinforcing bars at the joint of a reinforced concrete structure is not complicated and dense, interference between the reinforcing bars and other members is avoided, and reinforcing bars can be easily arranged. [Solution] The joint structure includes a joint section 33, a first beam 31 extending from the joint section 33 in a first horizontal direction, a second beam 32 extending from the joint section 33 in a second horizontal direction intersecting the first horizontal direction, and a special reinforcing bar 100. The special reinforcing bar 100 includes a first main reinforcing bar 110 extending in the first horizontal direction inside the first beam 31, a second main reinforcing bar 140 extending in the second horizontal direction inside the second beam 32, and a bent section 130 provided inside the joint section 33 continuing from the first main reinforcing bar 110 to the second main reinforcing bar 140 and bent along a corner defined by the first horizontal direction and the second horizontal direction. A step section 120 that is staggered in the vertical direction is provided at any position of the first main reinforcing bar 110, the bent section 130, and the second main reinforcing bar 140.

Description

[Technical Field]

[0001] The present invention relates to a joint structure. [Background technology]

[0002] For example, in Patent Document 1, a reinforcement structure for a joint in a building foundation is shown in which main reinforcements extending from two perpendicular directions are spaced slightly apart at the joint. Corner joint reinforcements bent into a roughly L-shape are placed to bridge this gap. In other words, the end of the main reinforcement near the joint and one side of the corner joint reinforcement are lap-spliced, creating a structure equivalent to that of a continuous reinforcing bar, with one main reinforcement, the corner joint reinforcement, and the other main reinforcement. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-143457 Summary of the Invention [Problem to be solved by the invention]

[0004] If the first floor is constructed of reinforced concrete wall structures, the beams on the first floor require a large number of main bars and reinforcing bars to be placed inside the beams to ensure strength. In particular, at the joints, the main bars are bent into an L shape along the exterior wall surface of the joint to ensure anchorage, resulting in a dense arrangement of rebar. This means that other components, such as anchors that connect the first floor beams to the second floor frame, are likely to interfere with the densely placed main bars inside the beams. As a result, the installation of the main bars and anchors becomes complicated and time-consuming.

[0005] The present invention has been made in consideration of the above circumstances, and its purpose is to provide a joint structure that allows for easy reinforcement arrangement without the need for complex and dense arrangement of reinforcing bars in the joints of reinforced concrete structures, and avoids interference between reinforcing bars and other components. [Means for solving the problem]

[0006] The invention described in claim 1 is, for example, as shown in FIGS. 1 to 4, Reinforced concrete joint 33 and a first beam 31 made of reinforced concrete extending in a first horizontal direction from the joint portion 33; a second beam 32 made of reinforced concrete extending from the joint portion 33 in a second horizontal direction intersecting the first horizontal direction; A joint structure including a functional reinforcing bar 100, The auxiliary reinforcing bar 100 includes a first main reinforcing bar portion 110 extending in the first horizontal direction inside the first beam 31, A second main reinforcement portion 140 extending in the second horizontal direction inside the second beam 32; a bending portion 130 provided continuously from the first main reinforcement portion 110 to the second main reinforcement portion 140 inside the joint portion 33, and bent along a corner defined by the first horizontal direction and the second horizontal direction, A feature of this is that a step portion 120 that is stepped in the vertical direction is provided at any position of the first main reinforcement portion 110, the bent portion 130, and the second main reinforcement portion 140.

[0007] According to the invention of claim 1, a reinforced concrete structure is provided with a joint section 33, a first beam 31, a second beam 32, and a special reinforcing bar 100, wherein the special reinforcing bar 100 comprises a first main reinforcing bar section 110 extending in a first horizontal direction inside the first beam 31, a second main reinforcing bar section 140 extending in a second horizontal direction inside the second beam 32, and a bent section 130 provided continuous from the first main reinforcing bar section 110 to the second main reinforcing bar section 140 inside the joint section 33 and bent along a corner defined by the first horizontal direction and the second horizontal direction. A step section 120 that is staggered in the vertical direction is provided at any position of the first main reinforcing bar section 110, the bent section 130, and the second main reinforcing bar 140. Therefore, even if many other main reinforcements are arranged inside the first beam 31, the joint 33, and the second beam 32, and other components such as anchors are arranged, the step 120 of the accessory reinforcing bar 100 allows the accessory reinforcing bar 100 to be arranged in a position where it does not interfere with the other main reinforcements or other components. In other words, a level difference can be created between the height position of the accessory reinforcing bar 100 and the other main reinforcements. Therefore, the auxiliary reinforcing bars 100 do not interfere with other main reinforcing bars, the arrangement of the reinforcing bars does not become complicated and dense, and the reinforcing bar arrangement work becomes easier. In addition, conventionally, in order to secure the main reinforcement at the joint section 33, the main reinforcement was bent into an L shape along the outer wall surface of the joint section 33, but by using the accessory reinforcing bar 100 which has a bent section 130 in advance, the reinforcement work can be easily carried out without securing the main reinforcement at the joint section 33.

[0008] The invention described in claim 2 is, for example, as shown in Figs. 1 to 4 and Figs. 6 to 8, in the joining structure described in claim 1, The step portion 120 of the accessory reinforcing bar (for example, the first to third accessory reinforcing bars 100A to 100C, 100A-1) is provided between the first main reinforcing bar portion 110 and the bending portion 130, or between the bending portion 130 and the second main reinforcing bar portion 140, The first main reinforcement portion 110 and the second main reinforcement portion 140 are characterized by being staggered in the vertical direction.

[0009] According to the invention described in claim 2, the step portion 120 of the accessory reinforcing bars (for example, the first to third accessory reinforcing bars 100A to 100C, 100A-1) is provided between the first main reinforcing bar 110 and the bending portion 130, or between the bending portion 130 and the second main reinforcing bar 140, and since the first main reinforcing bar 110 and the second main reinforcing bar 140 are staggered in the vertical direction, the step portion 120 can easily prevent interference between the accessory reinforcing bar 100 and other reinforcing bars, etc., even in areas near the bending portion 130 that tend to be densely packed.

[0010] The invention described in claim 3 is, for example, as shown in FIG. 6, in the joining structure described in claim 1, The bending portion 130 of the accessory reinforcing bar (for example, the third accessory reinforcing bar 100C or the first accessory reinforcing bar 100A-1) is arranged closer to the outer wall surface side of the first beam 31 and the second beam 32 than the first center line K1 in the width direction of the first beam 31 or the second center line K2 in the width direction of the second beam 32 in a plan view. It is characterized by:

[0011] According to the invention described in claim 3, the bending portion 130 of the accessory reinforcing bar (for example, the third accessory reinforcing bar 100C or the first accessory reinforcing bar 100A-1) is arranged, in a plan view, closer to the outer wall surface of the first beam 31 and the second beam 32 than the first center line K1 in the width direction of the first beam 31 or the second center line K2 in the width direction of the second beam 32. Therefore, the anchorage of the accessory reinforcing bar 100 can be sufficiently ensured compared to when the bending portion 130 is arranged closer to the inner wall surface of the first beam 31 and the second beam 32 than the first center line K1 or the second center line K2.

[0012] The invention described in claim 4 is, for example, as shown in FIG. 5, in the joining structure described in claim 1, A feature of the present invention is that at least one end 140a of the auxiliary reinforcing bar 100 is overlapped and connected to the end 500a of the joint reinforcing bar 500 extending in the first horizontal direction or the second horizontal direction inside the first beam 31 or the second beam 32, respectively.

[0013] According to the invention described in claim 4, at least one end 140a of the accessory reinforcing bar 100 is overlapped and connected to the end 500a of the joint reinforcing bar 500 extending in the first horizontal direction or the second horizontal direction inside the first beam 31 or the second beam 32, respectively, so that the accessory reinforcing bar 100 and the joint reinforcing bar 500 can be firmly connected.

[0014] The invention described in claim 5 is, for example, as shown in Figs. 1 and 3, in the joining structure described in claim 1, A plurality of the accessory reinforcing bars 100 are arranged inside the first beam 31, the joint portion 33, and the second beam 32, Among the plurality of auxiliary reinforcing bars 100, a first auxiliary reinforcing bar 100A and a second auxiliary reinforcing bar 100B are arranged parallel to each other in a plan view.

[0015] According to the invention described in claim 5, a plurality of accessory reinforcing bars 100 are arranged inside the first beam 31, the joint section 33, and the second beam 32, and among the plurality of accessory reinforcing bars 100, the first accessory reinforcing bars 100A and the second accessory reinforcing bars 100B are arranged parallel to each other in a plan view, so that the first accessory reinforcing bars 100A and the second accessory reinforcing bars 100B do not interfere with each other. Therefore, the arrangement of the reinforcing bars is not complicated and dense, and the reinforcing bar arrangement work is easy.

[0016] The invention described in claim 6 is, for example, as shown in Figs. 6 and 7, in the joining structure described in claim 1, A plurality of the accessory reinforcing bars 100 are arranged inside the first beam 31, the joint portion 33, and the second beam 32, Among the multiple accessory reinforcing bars 100, a first accessory reinforcing bar 100A-1 and a second accessory reinforcing bar 100B are arranged so as to intersect with each other in a plan view, and at the intersection portion L1, the first accessory reinforcing bar 100A-1 and the second accessory reinforcing bar 100B are staggered from each other in the vertical direction.

[0017] According to the invention of claim 6, a plurality of accessory reinforcing bars 100 are arranged inside the first beam 31, the joint section 33, and the second beam 32, and among the plurality of accessory reinforcing bars 100, the first accessory reinforcing bar 100A-1 and the second accessory reinforcing bar 100B are arranged so as to intersect with each other in a plan view, and at the intersection part L1, the first accessory reinforcing bar 100A-1 and the second accessory reinforcing bar 100B are staggered with respect to each other in the vertical direction, so that the first accessory reinforcing bar 100A-1 and the second accessory reinforcing bar 100B do not interfere with each other. Therefore, the arrangement of the reinforcing bars is not complicated and dense, and the reinforcing bar arrangement work is easy. The invention described in claim 7 is the joining structure described in claim 1, The joint structure is applied to a multi-story building, The upper floors of the multi-story building are characterized by having wooden frames. [Effects of the Invention]

[0018] According to the present invention, a joint structure is provided in which the arrangement of reinforcing bars at the joints of reinforced concrete structures is not complex and dense, interference between the reinforcing bars and other components is avoided, and reinforcing bars can be easily arranged. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a horizontal cross-sectional view of the joint structure according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] This is a horizontal cross-sectional view showing a method of joining the end of a secondary reinforcing bar and a joint reinforcing bar. [Figure 6] FIG. 10 is a horizontal cross-sectional view of a joint structure according to a second embodiment. [Figure 7] 7 is a cross-sectional view taken along line VII-VII in FIG. 6. [Figure 8] FIG. 7 is a schematic perspective view of the intersections L1 and L2 in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments will be described with reference to the drawings. Features and technical effects of the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. The drawings are provided for illustrative purposes only, and the scope of the present invention is not limited to the examples in the drawings.

[0021] 1. First embodiment [Joining structure] Fig. 1 is a horizontal cross-sectional view of the joint structure, Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. The joint structure is applied, for example, to the upper part of the first floor of a multi-story building. In the example shown in FIG. 1, the skeleton of at least the first floor of the building is a wall-type reinforced concrete structure, but it may also be a rigid frame-type reinforced concrete structure instead of a wall-type structure. Also, the skeletons of all floors of the building may be reinforced concrete. The skeletons of the lower floors of the building may be reinforced concrete, and the skeletons of the upper floors may be wooden.

[0022] In the example shown in Figures 1 to 3, the skeleton of the first floor of building 1 is made of reinforced concrete, and the skeleton of the second floor and above is made of wood. The wooden parts of building 1 are made of wall construction, frame construction, or a combination of both. Wall construction refers to a structure in which the weight of the building and its cargo and seismic forces are supported by walls. Frame construction refers to a structure in which the weight of the building and its cargo and seismic forces are supported by columns, beams, and braces. The wooden parts of a building may be constructed using panel construction, frame construction, frame panel construction, or frame wall construction, or a combination of two or more of these methods.

[0023] As shown in Fig. 2, a reinforced concrete exterior wall 2 is constructed around the periphery of the first floor of building 1. The exterior wall 2 has single or double wall reinforcement 21 and concrete 22, and the wall reinforcement 21 is embedded in the concrete 22. The wall reinforcement 21 has multiple vertical reinforcement and multiple horizontal reinforcement. Note that the wall reinforcement is not shown in Figs. 1 and 3.

[0024] Beams 3 are provided on top of the exterior walls 2. The upper ends of the exterior walls 2 are joined to the beams 3. Because the framework of at least the first floor is made of reinforced concrete with a wall structure, the beams 3 are also called lateral beams.

[0025] A reinforced concrete slab 4 is constructed inside the beam 3. The slab 4 extends horizontally, and the edges of the slab 4 are joined to the beam 3. The slab 4 has single or double slab reinforcement 41, which has multiple main reinforcements and multiple distribution reinforcements, and concrete 42, and the slab reinforcement 41 is embedded in the concrete 42.

[0026] A reinforced concrete rising section 5 is constructed on top of the beam 3, rising from the top surface of the slab 4. The rising section 5 and the beam 3 are integrated. The rising section 5 has rising reinforcement and concrete (not shown), and the rising reinforcement is embedded in the concrete. The rising reinforcement has multiple main reinforcement and multiple shear reinforcement. Note that if the height of the rising section 5 is low, beam reinforcement may extend to the concrete of the rising section 5 and be embedded in the concrete instead of the rising reinforcement.

[0027] A wooden base 6 is installed on top of the rising section 5, and a wooden exterior wall 7 is installed on top of the base 6. A number of wooden pillars 8 are installed at the corners above the rising section 5 (see Figure 3). Metal pillar bases 83 are attached to the pillars 8 (see Figure 1). The base 6 and the exterior wall 7 are fixed to the rising portion 5 by anchors 71 (see FIG. 1). Part of the anchor 71 is embedded in the concrete of the rising portion 5 and the beam 3 (described later), and the remaining part protrudes upward from the top surface of the rising portion 5. The pillar 8 is also fixed to the rising portion 5 by anchors 81.

[0028] As shown in Fig. 1, the beam 3 extends in the circumferential direction along the outer periphery of the building 1. Specifically, the beam 3 includes a first beam 31, a second beam 32, and a joint portion 33. The first beam 31, the second beam 32, and the joint portion 33 are made of reinforced concrete. The joint portion 33 is the portion where the first beam 31 and the second beam 32 intersect. The first beam 31 extends in a first horizontal direction (Y direction) from the joint portion 33. The second beam 32 extends in a second horizontal direction (X direction) perpendicular to the first horizontal direction from the joint portion 33. The first horizontal direction and the second horizontal direction are directions that are perpendicular to each other when the joint portion 33 is viewed in a plan view.

[0029] A plurality of auxiliary reinforcing bars 100 and a plurality of shear reinforcement bars 200 are arranged inside the first beam 31, the joint portion 33, and the second beam 32. In addition, these auxiliary reinforcing bars 100 and shear reinforcement bars 200 are embedded in concrete 300.

[0030] <Accessory rebar> In FIG. 1, a plurality of auxiliary reinforcing bars 100 are provided inside the first beam 31, the joint portion 33 and the second beam 32 from the first beam 31 through the joint portion 33 to the second beam 32. A plurality of auxiliary reinforcing bars 100 are embedded in the concrete 300 of the first beam 31, the joint 33 and the second beam 32 from the first beam 31 through the joint 33 to the second beam 32. A first auxiliary reinforcing bar 100A, a second auxiliary reinforcing bar 100B, and a third auxiliary reinforcing bar 100C are arranged in this order from the inside corner formed by the first beam 31 and the second beam 32 toward the outside corner. Since the first auxiliary reinforcing bar 100A, the second auxiliary reinforcing bar 100B, and the third auxiliary reinforcing bar 100C all have the same configuration, in the following explanation, their configuration will be explained as the auxiliary reinforcing bar 100.

[0031] The accessory reinforcing bar 100 comprises a first main reinforcing bar section 110, a bent section 130, and a second main reinforcing bar section 140. A step section 120 is provided between the first main reinforcing bar section 110 and the bent section 130. The first main reinforcing bar section 110, the step section 120, the bent section 130, and the second main reinforcing bar section 140 are integrally formed in this order. The first main reinforcement portion 110 extends in the first horizontal direction inside the first beam 31. The step portion 120 is disposed inside the first beam 31 . The bent section 130 is provided continuously from the first main reinforcement section 110 to the second main reinforcement section 140 inside the joint section 33, and is bent along the corner defined by the first horizontal direction and the second horizontal direction. In other words, the bent section 130 is bent along the L-shape formed by the outer wall surface of the joint section 33. The second main reinforcement portion 140 extends in the second horizontal direction inside the second beam 32.

[0032] 4 is a cross-sectional view taken along line IV-IV in FIG. 4, the step portion 120 is provided between one end (end on the bending portion side) 110a of the first main reinforcement portion 110 and one end (end on the first beam side) 130b of the bending portion 130. The step portion 120 extends from the end 110a of the first main reinforcement portion 110 to the end 130b of the bending portion 130 so as to form a gentle downward slope.

[0033] The second main reinforcement section 140 is provided at the end of the bent section 130 opposite to the stepped section 120. The first main reinforcement section 110 and the second main reinforcement section 140 are offset from each other in the vertical direction by the stepped section 120. That is, the first main reinforcement section 110 is disposed above the second main reinforcement section 140. Note that in the accessory reinforcing bars 100 (first to third accessory reinforcing bars 100A to 100C described below) shown in Figures 1 and 3, the upper portion (high level) and the lower portion (low level) are shown with different dot patterns.

[0034] 4, the step portion 120 extends from the end portion 110a of the first main reinforcement portion 110 at an incline downward, but this is not limiting, and the step portion 120 may extend from the end portion 110a of the first main reinforcement portion 110 at an incline upward. In this case, the first main reinforcement portion 110 is disposed below the second main reinforcement portion 140.

[0035] As shown in Figure 1, the first auxiliary reinforcing bar 100A, second auxiliary reinforcing bar 100B and third auxiliary reinforcing bar 100C having the above-mentioned configuration are arranged inside the first beam 31, joint section 33 and second beam 32. As described above, the first auxiliary reinforcing bar 100A, the second auxiliary reinforcing bar 100B, and the third auxiliary reinforcing bar 100C are arranged in this order from the inside corner formed by the first beam 31 and the second beam 32 toward the outside corner. That is, when the beam 3 is viewed from above, the first special reinforcing bar 100A, the second special reinforcing bar 100B, and the third special reinforcing bar 100C are arranged parallel to one another.

[0036] The height positions of the first main reinforcement portions 110 of the first to third special reinforcing bars 100A to 100C are the same. The height positions of the second main reinforcement portions 140 of the first to third special reinforcing bars 100A to 100C are also the same. The height and inclination angle of each step 120 of the first to third auxiliary reinforcing bars 100A to 100C are the same. In addition, each step 120 is disposed at the same position in the first horizontal direction of the first beam 31 when viewed in a plan view. Therefore, the first to third auxiliary reinforcing bars 100A to 100C do not intersect with each other inside the first beam 31, the joint portion 33, and the second beam 32.

[0037] As shown in FIG. 3, fourth to sixth special reinforcing bars 100D, 100E, and 100F are arranged below first to third special reinforcing bars 100A, 100B, and 100C. The fourth reinforcing bar 100D is arranged below the first reinforcing bar 100A and parallel to it in the height direction. The fifth reinforcing bar 100E is arranged below the second reinforcing bar 100B and parallel to it in the height direction. The sixth reinforcing bar 100F is arranged below the third reinforcing bar 100C and parallel to it in the height direction. That is, the fourth functional reinforcing bar 100D, the fifth functional reinforcing bar 100E, and the sixth functional reinforcing bar 100F are arranged in this order from the inside corner toward the outside corner formed by the first beam 31 and the second beam 32. When the beam 3 is viewed from above, the fourth functional reinforcing bar 100D, the fifth functional reinforcing bar 100E, and the sixth functional reinforcing bar 100F are arranged parallel to each other. The first to sixth auxiliary reinforcing bars 100D to 100F do not intersect with each other inside the first beam 31, the joint portion 32, and the second beam 33.

[0038] Shear reinforcement bars 200 are arranged around each of the first main reinforcement portions 110 of the first to sixth functional reinforcing bars 100A to 100F. In Fig. 1, two shear reinforcement bars 200 are arranged around each of the first main reinforcement portion 110 and the second main reinforcement portion 140, but the locations where the shear reinforcement bars 200 are arranged can be changed as appropriate. The shear reinforcement bars 200 are provided in a direction perpendicular to the first horizontal direction of the first main reinforcement sections 110 and the second horizontal direction of the second main reinforcement sections 140, respectively.

[0039] A plurality of anchors 71 for fixing the wooden exterior wall 7 are arranged between the first function reinforcing bar 100A and the second function reinforcing bar 100B in the width direction of the beam 3. Specifically, in Fig. 1, anchors 71 are arranged vertically between the first main reinforcement section 110 of the first function reinforcing bar 100A and the first main reinforcement section 110 of the second function reinforcing bar 100B, between the bent section 130 of the first function reinforcing bar 100A and the bent section 130 of the second function reinforcing bar 100B, and between the second main reinforcement section 140 of the first function reinforcing bar 100A and the second main reinforcement section 140 of the second function reinforcing bar 100B. The lower end of the anchor 71 arranged in this manner is located above the fourth auxiliary reinforcing bar 100D, which is below the first auxiliary reinforcing bar 100A, and above the fifth auxiliary reinforcing bar 100E, which is below the second auxiliary reinforcing bar 100B. Therefore, the anchor 71 does not interfere with the first, second, fourth and fifth auxiliary reinforcing bars 100A, 100B, 100D and 100E.

[0040] Similarly, a plurality of anchors 71 for fixing the wooden exterior wall 7 are arranged between the second function reinforcing bar 100B and the third function reinforcing bar 100C in the width direction of the beam 3. Specifically, in Fig. 1, anchors 71 are arranged vertically between the first main reinforcement part 110 of the second function reinforcing bar 100B and the first main reinforcement part 110 of the third function reinforcing bar 100C, between the bent part 130 of the second function reinforcing bar 100A and the bent part 130 of the third function reinforcing bar 100C, and between the second main reinforcement part 140 of the second function reinforcing bar 100B and the second main reinforcement part 140 of the third function reinforcing bar 100C. The lower end of the anchor 71 arranged in this manner is located above the fifth auxiliary reinforcing bar 100E, which is below the second auxiliary reinforcing bar 100B, and above the sixth auxiliary reinforcing bar 100F, which is below the third auxiliary reinforcing bar 100C. Therefore, the anchor 71 does not interfere with the second, third, fifth and sixth auxiliary reinforcing bars 100B, 100C, 100E and 100F (see FIG. 3).

[0041] Additionally, anchors 81 for securing columns 8 are arranged between the bent portion 130 of first functional reinforcing bar 100A and the bent portion 130 of second functional reinforcing bar 100B, and between the bent portion 130 of second functional reinforcing bar 100B and the bent portion 130 of third functional reinforcing bar 100C. In FIG. 1, there are four columns 8, and three of the four columns 8 are secured with anchors 81, with bending reinforcement bars 82 being arranged in the column 8 located at the outermost corner. The anchors 81 and bending reinforcement bars 82 for securing columns 8 do not interfere with the first to sixth functional reinforcing bars 100A to 100F.

[0042] The first to sixth auxiliary reinforcing bars 100A to 100F, the shear reinforcement bar 200, the anchors 71, 81 and the flexural reinforcement bar 82 are embedded in the concrete 300 inside the first beam 31, the joint portion 33 and the second beam 32, respectively.

[0043] [Joining method] A joining method for the first beam 31, the joint portion 33 and the second beam 32 using the above-mentioned accessory reinforcing bars 100 will be explained. Formwork, shoring, reinforcing bars, and anchors are assembled for the first floor of the building 1. Specifically, first to sixth special reinforcing bars 100A to 100F are arranged inside the first beam 31, joint portion 33, and second beam 32. Here, the order in which the first to sixth special reinforcing bars 100A to 100F are arranged is not particularly limited.

[0044] After the first functional reinforcing bar 100A is placed, both ends of the first functional reinforcing bar 100A are connected to joint reinforcing bars 500, as shown in Fig. 5. That is, inside the second beam 32, the joint reinforcing bars 500 extend in the second horizontal direction. The joint reinforcing bars 500 extend horizontally at the same height as the second main reinforcement section 140 of the first functional reinforcing bar 100A. The joint reinforcing bars 500 are main reinforcements that are not functional reinforcing bars. Then, the end 500a of the joint reinforcing bar 500 is connected to the end 140a of the second main reinforcing bar portion 140 of the first role reinforcing bar 100A on the opposite side to the bent portion 130. The connection method is not particularly limited, but it is preferable to overlap the end 140a of the second main reinforcing bar with one end 500a of the joint reinforcing bar 500 and connect them with wire W or the like. As another connection method, the end 140a of the second main reinforcing bar portion 140 and the end 500a of the joint reinforcing bar 500 may be connected by welding.

[0045] Although not shown, the end of the first main reinforcement portion 110 of the first functional reinforcing bar 100A opposite the step portion 120 is also connected to a joint reinforcement bar separately arranged inside the first beam 31. In this case, too, the joint reinforcement bar extends in the first horizontal direction inside the first beam 31. The joint reinforcement bar extends horizontally at the same height as the first main reinforcement portion 110 of the first functional reinforcing bar 100A. Then, using the above-mentioned connecting method, the joint reinforcing bar is connected to the end of the first main reinforcing bar portion 110 of the first functional reinforcing bar 100A on the opposite side to the step portion 120.

[0046] Also, although not shown, at each end of the second to sixth accessory reinforcing bars 100B to 100F, similar to the first accessory reinforcing bar 100A, joint reinforcing bars separately arranged inside the first beam 31 and the second beam 32 are connected to both ends of the second to sixth accessory reinforcing bars 100B to 100F.

[0047] After the first to sixth accessory reinforcing bars 100A to 100F are arranged, shear reinforcement bars 200 are arranged at predetermined positions. In addition, a plurality of anchors 71, 81, etc. are installed between each accessory reinforcing bar.

[0048] Next, a formwork is set up around the reinforcing bars and the like arranged as described above, and concrete 300 is poured inside the formwork. After the concrete 300 has cured, an anvil is set up on the rising portion 5. Thereafter, anchors 71 are passed through the through-holes in the base 6, and the base 6 is placed on the anvil. Furthermore, the exterior wall (wall panel) 7 is placed on the base 6.

[0049] Although the anchors 71 for the exterior wall and the anchors 81 for the pillars are constructed after the auxiliary reinforcing bars 100A to 100F are arranged, this order may be reversed.

[0050] According to this embodiment, the following excellent effects are achieved. The joint structure in this embodiment includes a reinforced concrete joint section 33, a first beam 31, a second beam 32, and a special reinforcing bar 100. The special reinforcing bar 100 includes a first main reinforcing bar section 110 extending in the first horizontal direction inside the first beam 31, a second main reinforcing bar section 140 extending in the second horizontal direction inside the second beam 32, and a bent section 130 extending from the first main reinforcing bar section 110 to the second main reinforcing bar section 140 inside the joint section 33 and bent along a corner defined by the first horizontal direction and the second horizontal direction. A step section 120 that is uneven in the vertical direction is provided at any position of the first main reinforcing bar section 110, the bent section 130, and the second main reinforcing bar 140. Therefore, even if many other main reinforcements are arranged inside the first beam 31, the joint 33, and the second beam 32, and other components such as anchors are arranged, the stepped portion 120 of the accessory reinforcing bar 100 allows the reinforcement to be arranged in a position that does not interfere with the other main reinforcements or other components. In other words, a level difference can be created between the height position of the accessory reinforcing bar 100 and the other main reinforcements. Therefore, the auxiliary reinforcing bars 100 do not interfere with other main reinforcing bars, the arrangement of the reinforcing bars does not become complicated and dense, and the reinforcing bar arrangement work becomes easier. In addition, conventionally, in order to secure the main reinforcement at the joint section 33, the main reinforcement was bent along the joint section 33, but by using the accessory reinforcing bar 100 which has a bent section 130 in advance, the reinforcement work can be easily performed without securing the main reinforcement at the joint section 33.

[0051] The step portion 120 of the accessory reinforcing bar 100 is provided between the first main reinforcing bar 110 and the bending portion 130, and the first main reinforcing bar 110 and the second main reinforcing bar 140 are staggered in the vertical direction, so that the step portion 120 can easily prevent interference between the accessory reinforcing bar 100 and other reinforcing bars, etc., even in areas that tend to be dense near the bending portion 130.

[0052] At least one end 140a of the accessory reinforcing bar 100 is overlapped and connected to the end 500a of the joint reinforcing bar 500 extending in the first horizontal direction or the second horizontal direction inside the first beam 31 or the second beam 32, respectively, so that the accessory reinforcing bar 100 and the joint reinforcing bar 500 can be firmly connected.

[0053] Since the first to third accessory reinforcing bars 100A to 100C are arranged parallel to one another in a plan view, they do not interfere with each other. This prevents the reinforcing bars from being arranged in a complicated and dense manner, making the reinforcing bar arrangement easier.

[0054] 2. Second embodiment [Joining structure] The first special reinforcing bar 100A-1 in the second embodiment is different from the first special reinforcing bar 100A in the first embodiment in terms of its position inside the first beam 31. In addition, in the second embodiment, a regular reinforcing bar 400 that is not a special reinforcing bar is also arranged. Hereinafter, this regular reinforcing bar will also be simply referred to as a "regular reinforcing bar." In the following, components similar to those in the first embodiment are given the same reference numerals and their description will be omitted. Fig. 6 is a horizontal cross-sectional view of the joint structure. Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 6. In each accessory reinforcing bar (first to third accessory reinforcing bars 100A-1, 100B, 100C) shown in Fig. 6, the upper portion (high level) and the lower portion (low level) are shown with different dot patterns.

[0055] <Normal rebar> 6, a normal reinforcing bar 400 includes a first main reinforcement section 410, a bent section 430, and a second main reinforcement section 440. The first main reinforcement section 410, the bent section 430, and the second main reinforcement section 440 are integrally formed in this order. The first main reinforcement portion 410 extends in the first horizontal direction inside the first beam 31. The bent portion 430 is bent inside the joint 33 along the L-shape formed by the outer wall surface of the joint 33 . The second main reinforcement portion 440 extends in the second horizontal direction inside the second beam 32. The first main reinforcement section 410 and the bent section 430 are arranged horizontally at the same height. The second main reinforcement section 40 is inclined downward from one end to the other end of the bent section 430 (see FIG. 7). The first main reinforcement section 410 and the bent section 430 are arranged horizontally so as to be at the same height as the first main reinforcement sections 110 of the first to third auxiliary reinforcing bars 100A-1, 100B, and 100C.

[0056] The first main reinforcement portion 410 of the normal reinforcing bar 400 is arranged inward (toward the inner wall surface of the first beam 31) from the first main reinforcement portion 110 of the second auxiliary reinforcing bar 100B in plan view. The second main reinforcement section 440 of the normal reinforcing bar 400 is arranged between the second main reinforcement section 140 of the second auxiliary reinforcing bar 100B and the second main reinforcement section 140 of the third auxiliary reinforcing bar 100C in a planar view, and is close to the second main reinforcement section 140 of the third auxiliary reinforcing bar 100C. Here, in a plan view, a line passing through the center of the first beam 31 in the width direction is referred to as a first center line K1, and a line passing through the center of the second beam 32 in the width direction is referred to as a second center line K2. In this case, the first main reinforcement portion 410 of the normal reinforcing bar 400 is arranged inside the first beam 31 closer to the inner wall surface of the first beam 31 than the first center line K1. The second main reinforcement portion 440 is arranged inside the second beam 32 closer to the outer wall surface of the second beam 32 than the second center line K2. Moreover, the bent portion 430 is arranged inside the second beam 32 closer to the outer wall surface side of the second beam 32 than the second center line K2. By arranging the reinforcing bars in this manner, the reinforcing bars 400 are usually firmly fixed.

[0057] <First auxiliary rebar> The first auxiliary reinforcing bar 100A-1 is integrally formed in the order of the first main reinforcement section 110, the bent section 130, the step section 120 and the second main reinforcement section 140, and the position of the step section 120 is different from that of the first auxiliary reinforcing bar 100A of the first embodiment. In detail, the first main reinforcement section 110 of the first auxiliary reinforcing bar 100A-1 is arranged between the second auxiliary reinforcing bar 100B and the third auxiliary reinforcing bar 100C in a plan view, and is close to the first main reinforcement section 110 of the third auxiliary reinforcing bar 100C. The second main reinforcement portion 140 of the first auxiliary reinforcing bar 100A-1 is arranged inside (toward the inner wall surface of the second beam 32) the second auxiliary reinforcing bar 100B in plan view. The first main reinforcement portion 110 of the first auxiliary reinforcing bar 100A-1 is arranged inside the first beam 31 closer to the outer wall surface of the first beam 31 than the first center line K1. The second main reinforcement portion 140 is arranged inside the second beam 32 closer to the inner wall surface of the second beam 32 than the second center line K2. Moreover, the bent portion 130 is arranged inside the first beam 31 closer to the outer wall surface side of the first beam 31 than the first center line K1. By arranging the reinforcement in this manner, the first auxiliary reinforcing bar 100A-1 is firmly fixed.

[0058] The step portion 120 of the first special reinforcing bar 100A-1 is arranged inside the joint portion 33, and is arranged in a different position from the step portions 120 of the second and third special reinforcing bars 100B, 100C arranged inside the first beam 31. The step portion 120 of the first special reinforcing bar 100A-1 slopes gently downward from the bent portion 130 toward the second main reinforcing bar portion 140.

[0059] The first special reinforcing bar 100A-1 arranged as described above intersects with the second special reinforcing bar 100B in plan view. Furthermore, the first special reinforcing bar 100A-1 intersects with the normal reinforcing bar 400 in plan view.

[0060] FIG. 8 is a schematic perspective view of the intersections L1 and L2 in FIG. As described above, the first and second reinforcing bars 100A-1 and 100B have different positions of the step portion 120 in a plan view. Therefore, at the intersection L1 between the first and second reinforcing bars 100A-1 and 100B, the first reinforcing bar 100A-1 is positioned above the second reinforcing bar 100B. Therefore, the first and second reinforcing bars 100A-1 and 100B do not interfere with each other.

[0061] In addition, the first auxiliary reinforcing bar 100A-1 intersects with the normal reinforcing bar 400 in plan view. However, the first special reinforcing bar 100A-1 has a step portion 120, and at the intersection L2 with the normal reinforcing bar 400, the first special reinforcing bar 100A-1 is arranged below the normal reinforcing bar 400. Therefore, the first special reinforcing bar 100A-1 and the normal reinforcing bar 400 do not interfere with each other.

[0062] Note that another normal reinforcing bar 400A is arranged below normal reinforcing bar 400 (see FIG. 7). Unlike normal reinforcing bar 400, normal reinforcing bar 400A has second main reinforcing bar portions 440 that slope upward from one end to the other end of bent portion 430, and similarly has first main reinforcing bar portions and bent portions, and these first main reinforcing bar portions and bent portions are arranged horizontally so as to be at the same height.

[0063] [Joining method] The joining method in the second embodiment is the same as the joining method in the first embodiment, except that normal reinforcing bars 400, 400A are arranged in addition to the first to sixth accessory reinforcing bars 100A-1, 100B to 100F.

[0064] According to this embodiment, the following excellent effects are achieved. In plan view, the bent portion 130 of the first part reinforcing bar 100A-1 is disposed closer to the outer wall surface of the first beam 31 than the first center line K1 in the width direction of the first beam 31. Therefore, the first part reinforcing bar 100A-1 can be sufficiently fixed.

[0065] The first and second reinforcing bars 100A-1 and 100B are arranged so as to intersect each other in a plan view, and at the intersection L1, the first and second reinforcing bars 100A-1 and 100B are staggered in the vertical direction, so the first and second reinforcing bars 100A-1 and 100B do not interfere with each other. This prevents the reinforcing bars from being arranged in a complex and dense manner, making the reinforcing bar arrangement easier.

[0066] Furthermore, in recent years, there has been a demand for the realization of a carbon-neutral society by promoting carbon neutrality, which means reducing carbon dioxide emissions to virtually zero, and for the achievement of the SDGs (Sustainable Development Goals), and in the construction industry too, efforts are being made to use wooden buildings, which have lower carbon dioxide emissions.Buildings that use the above-mentioned joint structure have wooden frames on the second floor and above, and by using wood materials, they can contribute to the realization of a carbon-neutral society by promoting carbon neutrality and the achievement of the SDGs.

[0067] The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention. For example, in the first and second embodiments, the step portion 120 is provided at one location on the accessory reinforcing bar 100, but it may be provided at multiple locations. For example, the first accessory reinforcing bar 100A-1 may have two step portions 120, each of which is inclined downward from the first main reinforcing bar 110 side toward the second main reinforcing bar 140 side. Also, one step portion may be inclined downward from the first main reinforcing bar 110 side toward the second main reinforcing bar 140 side, and the other step portion may be inclined upward.

[0068] Furthermore, the number of accessory reinforcing bars 100 and the positions of the accessory reinforcing bars 100 inside the beam 3 can be changed as appropriate. Furthermore, in the second embodiment, the second main reinforcement section 440 of the normal reinforcing bar 400 is inclined from one end to the other end of the bending section 430, but it may be arranged horizontally so that the first main reinforcement section 410, the bending section 430, and the second main reinforcement section 440 are at the same height position without being inclined. [Explanation of symbols]

[0069] 31 First beam 32 Second beam 33 Joint 100 Accessory rebar 100A First-class rebar 100A-1 First auxiliary rebar 100B Secondary Reinforcement Bar 110 First main reinforcement section 120 Step 130 Bent section 140 Second main reinforcement section 140a end 500 Reinforced concrete joint 500a end K1 First center line K2 Second center line L1 intersection

Claims

1. Reinforced concrete joints and a first beam made of reinforced concrete extending in a first horizontal direction from the joint; a second beam made of reinforced concrete extending from the joint in a second horizontal direction intersecting the first horizontal direction; A joint structure comprising a functional reinforcing bar, The auxiliary reinforcing bar includes a first main reinforcing bar extending in the first horizontal direction inside the first beam, and a second main reinforcing bar extending in the second horizontal direction inside the second beam, a bent portion provided continuously from the first main reinforcement portion to the second main reinforcement portion inside the connection portion, and bent along a corner defined by the first horizontal direction and the second horizontal direction, A step portion that is different in level in the vertical direction is provided at any position of the first main reinforcement portion, the bent portion, and the second main reinforcement portion. A joining structure characterized by:

2. The step portion of the accessory reinforcing bar is provided between the first main reinforcement portion and the bending portion, or between the bending portion and the second main reinforcement portion, The first main reinforcement portion and the second main reinforcement portion are staggered in the vertical direction. The joining structure according to claim 1 .

3. The bent portion of the accessory reinforcing bar is arranged on the outer wall surface side of the first beam and the second beam relative to a first center line in the width direction of the first beam or a second center line in the width direction of the second beam in a plan view. The joining structure according to claim 1 .

4. At least one end of the accessory reinforcing bar is overlapped and connected to the end of the joint reinforcing bar extending in the first horizontal direction or the second horizontal direction inside the first beam or the second beam, respectively. The joining structure according to claim 1 .

5. A plurality of accessory reinforcing bars are arranged inside the first beam, the joint portion, and the second beam, Among the plurality of accessory reinforcing bars, the first accessory reinforcing bar and the second accessory reinforcing bar are arranged parallel to each other in a plan view. The joining structure according to claim 1 .

6. A plurality of accessory reinforcing bars are arranged inside the first beam, the joint portion, and the second beam, Among the plurality of accessory reinforcing bars, the first accessory reinforcing bar and the second accessory reinforcing bar are arranged so as to intersect with each other in a plan view, and at the intersection portion, the first accessory reinforcing bar and the second accessory reinforcing bar are staggered from each other in the vertical direction. The joining structure according to claim 1 .

7. The joint structure is applied to a multi-story building, The upper floors of the multi-story building are made of wood. The joining structure according to claim 1 .

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