JP2025082022A - Wall junction structure for building - Google Patents

Abstract

To provide a wall junction structure for buildings that facilitates the joining of wall members to structure members.SOLUTION: A wall junction structure for a building 1 comprises first structural members 12, 13 that are made of precast concrete constituting one of a column 2 and a beam 3, a wall member 14 that is made of precast concrete extending along the first structural members and is joined to the first structural members, and a plurality of tendons 17 for joining the wall member to the first structural members. The wall member has a pair of thickening parts 16 which extend along the marginal parts that are joined to the first structural members, and protrude at both sides on the thickness direction to increase thickness of the wall member. First open holes 18 are formed on each of the thickening parts for having the tendons inserted, second open holes 22 are formed on the first structural members at positions matching with the first open holes, and the tendons are arranged to run through the first open holes and the second open holes.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wall joint structure for a building, and more specifically, to a wall joint structure for joining a wall member made of precast concrete to a structural member.

Precast concrete column and beam members are sometimes used for the columns and beams of buildings with rigid frame structures. When using precast concrete members in walls made of reinforced concrete, it is necessary to rigidly connect precast concrete wall members to these precast concrete column and beam members. To achieve this, one method is to embed insert bars in the column and beam members so that they protrude from the beam and column members, and then connect the vertical and horizontal bars of the wall members to these insert bars with lap joints, etc.

Patent Document 1 discloses a joint structure for reinforced concrete construction in which an earthquake-resistant stud and a beam member are joined by PC steel bars. In this joint structure, the beam joints at both ends of the earthquake-resistant stud have a larger planar cross-sectional area than the central portion and are formed into a rigid stub shape, and the earthquake-resistant stud and the beam member are pressure-bonded together by prestress from the PC steel bars that pass through the beam joints and the beam member.

JP 2001-227089 A

Conventional joint structures between precast concrete structural members and wall members have the problem that construction work is complicated because concrete must be poured on-site at the rebar joints. However, the joint structure in Patent Document 1 is a joint structure between a partition wall and a beam member, and it is difficult to apply this structure to joints between structural members and wall members.

In view of the above background, the present invention aims to make it easier to join wall members to structural members in building wall joint structures.

In order to solve the above problem, one aspect of the present invention is a wall joint structure for a building (1) comprising a first structural member (12, 13) made of precast concrete constituting one of the columns (2) and the beams (3), a wall member (14) made of precast concrete extending along the first structural member and joined to the first structural member, and a plurality of tendons (17) for joining the wall member to the first structural member, in which the wall member has a pair of widening portions (16) extending along the edge joined to the first structural member and protruding on both sides in the thickness direction to widen the thickness of the wall member, a first through hole (18) for inserting the tendons is formed in each of the widening portions, a second through hole (22) is formed at a position aligned with the first through hole of the first structural member, and the tendons are arranged to pass through the first through hole and the second through hole.

According to this aspect, the wall member and the first structural member are joined by the tendon. This makes it easier to join the wall member to the structural member in the wall joint structure of a building.

In the above aspect, the building may include a pair of the first structural members arranged parallel to each other, and the wall member may be arranged between the pair of the first structural members and may include a pair of the widening portions at both edges that are joined to the pair of the first structural members so as to be joined to each of the pair of the first structural members.

According to this aspect, the wall member is joined to each of the pair of first structural members, so that the wall member and the structural member can be joined reliably.

In the above aspect, the wall member may further include a second structural member (12, 13) made of precast concrete that constitutes the other of the pillar and the beam, and the wall member may extend along the second structural member and have a pair of widening portions along the edge portion that is joined to the second structural member so as to be joined to the second structural member.

According to this aspect, the wall member can be joined to both the pillars and the beams.

In the above aspect, the building may include a pair of the second structural members arranged parallel to each other, and the wall member may be arranged between the pair of the second structural members and may include a pair of the widening portions at both edges that are joined to the pair of the second structural members so as to be joined to each of the pair of the second structural members.

According to this embodiment, the wall member can be joined to both a pair of columns and a pair of beams.

In the above aspect, the wall member is divided into a plurality of parts in the longitudinal direction of the first structural member, and includes a first wall division (14A) constituting a portion including a pair of the widening portions provided on one of the two edge portions, a second wall division (14B) constituting a portion including a pair of the widening portions provided on the other of the two edge portions, and a third wall division (14C) constituting a portion between the first wall division and the second wall division, and the wall joint structure may further include a plurality of connecting tendons (37) for connecting the first wall division, the second wall division, and the third wall division.

According to this embodiment, the wall member can be divided into a number of sections. This allows the wall member to be transported efficiently. In addition, the wall member can be easily disassembled.

In the above aspect, each of the joint surfaces (30) of the first wall division and the second wall division with respect to the corresponding structural member may be provided with a recess (31) for accommodating an anchoring member (40) for anchoring the connecting tendon.

This aspect allows the connecting tendons to be fixed in place.

In the above aspect, the pair of widening portions joined to the pillars protrude more than the pair of widening portions joined to the beams, and the first through holes formed in the pair of widening portions joined to the pillars are preferably positioned further outward in the thickness direction than the pair of widening portions joined to the beams.

According to this embodiment, the widening portion joined to the column and the widening portion joined to the beam are stepped in the thickness direction, so that tension members can be provided at the upper and lower ends of the widening portion joined to the column.

In the above aspect, it is preferable that the width in the thickness direction of the pair of widening sections joined to the column is smaller than the width of the beam.

This aspect allows the wall joint structure to be made smaller in thickness.

The above aspects make it easier to join wall members to structural members in a building wall joint structure.

A side view of a part of a building to which a wall joint structure according to the first embodiment is applied. A cross-sectional view taken along line II-II in FIG. FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. A side view of a part of a building to which a wall joint structure according to a second embodiment is applied. A side view of a part of a building to which a wall joint structure according to a third embodiment is applied. A cross-sectional view of a wall joint structure according to a fourth embodiment of the present invention. A side view of a part of a building to which a wall joint structure according to a fifth embodiment is applied.

Some embodiments of the present invention will be described in detail below with reference to the drawings. The present invention is applied to a precast concrete rigid frame building made of reinforced concrete or steel-reinforced concrete.

First Embodiment
First, a first embodiment of the present invention will be described with reference to Figs. 1 to 3. Fig. 1 is a side view of a part of a building 1 to which a wall joint structure according to the first embodiment is applied. Fig. 2 is a plan sectional view taken along line II-II in Fig. 1. Fig. 3 is a vertical sectional view taken along line III-III in Fig. 1. As shown in Figs. 1 to 3, the building 1 includes a pair of columns 2 arranged parallel to each other, a pair of beams 3 arranged parallel to each other and joined at both ends in the extension direction to the pair of columns 2, and a wall 4 arranged between the pair of columns 2 and between the pair of beams 3. The columns 2 are arranged at predetermined positions with a predetermined interval in the X direction and the Y direction perpendicular to each other in a plan view. The columns 2 may be provided in three or more rows in at least one of the X direction and the Y direction. The beams 3 are provided so as to extend in each of the X direction and the Y direction. The beams 3 are provided at predetermined positions in the vertical direction for each story of the building 1, and support floors (not shown).

The column 2 is composed of a column member 12, which is a structural member made of precast concrete. The column member 12 is erected at a predetermined position above a lower column, foundation, etc. constructed below. The column member 12 may be the same length as the floor height of the first floor, or may be longer than the floor height of the first floor. Alternatively, the column member 12 may be shorter than the floor height of the first floor. The column member 12 is preferably joined to the lower column, foundation, etc. below by an unbonded tendon.

The beam 3 is composed of a beam member 13, which is a structural member made of precast concrete. In this embodiment, the beam 3 is composed of one beam member 13. In other embodiments, the beam 3 may be composed of a plurality of beam members 13 arranged in series and connected by appropriate means. The length of the beam member 13 is slightly shorter than the distance between a pair of column members 12. The beam member 13 is placed between the pair of column members 12. The beam member 13 has both ends joined to the pair of column members 12 and is suspended across the pair of column members 12.

The wall 4 is composed of a wall member 14, which is a structural member made of precast concrete. In this embodiment, the wall 4 is composed of a single wall member 14. The wall 4 has a main body portion 15 that extends vertically along the column member 12, and a pair of widening portions 16 provided on both sides of the main body portion 15 in the thickness direction.

The main body 15 is formed in a rectangular plate shape. The length of the main body 15 in the width direction is slightly shorter than the distance between a pair of pillar members 12. The height of the main body 15 is slightly shorter than the distance between a pair of beam members 13. The main body 15 is disposed between a pair of pillar members 12 and a pair of beam members 13.

The pair of widening portions 16 each protrude from the main body portion 15 on both sides in the thickness direction to widen the thickness of the wall member 14. The pair of widening portions 16 each preferably extends along the edge of the main body portion 15 in a side view. Each of the pair of widening portions 16 has left and right first widening portions 16A that extend vertically along the column member 12, and upper and lower second widening portions 16B that extend widthwise along the beam member 13.

In this way, the wall joint structure of the building 1 is a joint structure between the column member 12 and the beam member 13 and the wall member 14. In this embodiment, two wall members 14 are arranged adjacent to each other in the width direction via one column member 12. Each wall member 14 is pressure-joined to the corresponding column member 12 by a tension member 17 arranged to span from the first widening portion 16A of one wall member 14 to the first widening portion 16A of the other wall member 14. A filler material may be filled between the wall member 14 and the column member 12 or the beam member 13. As a result, the wall joint structure of the building 1 is made of prestressed concrete.

In this embodiment, two wall members 14 are arranged adjacent to each other vertically via one beam member 13. Each wall member 14 is crimped and joined to the corresponding beam member 13 by a tension member 17 arranged to span from the second widening portion 16B of one wall member 14 to the second widening portion 16B of the other wall member 14.

The tension members 17 are made of PC steel rods, PC steel wires, PC steel strands, high-strength reinforcing bars, or rods or cables made of fiber-reinforced plastic such as aramid fiber, carbon fiber, or glass fiber. The tension members 17 are preferably used as unbonded tension members that are not bonded to the column members 12, beam members 13, and wall members 14. By making the tension members 17 unbonded, residual deformation after the end of an earthquake is reduced, and the precast members can be dismantled and reused after the building 1 is demolished.

As shown in FIG. 2, a plurality of first through holes 18 for inserting the tension members 17 are formed in each of the first widening portions 16A of the wall member 14. Each of the first through holes 18 extends horizontally along the width direction of the wall member 14. A column side through hole 19 for inserting the tension members 17 is formed in the column member 12 at a position aligned with the first through hole 18. The column side through hole 19 extends horizontally along the width direction of the column member 12. Each tension member 17 is arranged to pass through the first through hole 18 and the column side through hole 19.

While tension is applied to each tension member 17, both ends are fixed to the outer surfaces of the corresponding first widened portions 16A of the two wall members 14 by the fixing devices 20. This introduces prestress to the column members 12 and the wall members 14, and the first widened portions 16A of the wall members 14 are pressed against the corresponding column members 12. At this time, the main body portion 15 is joined to the column members 12 at its edge.

As shown in FIG. 3, a plurality of second through holes 22 for inserting the tension members 17 are formed in each of the second widening portions 16B of the wall member 14. Each of the second through holes 22 extends vertically along the height direction of the wall member 14. A beam side through hole 23 for inserting the tension members 17 is formed in the beam member 13 at a position aligned with the second through hole 22. The beam side through hole 23 extends vertically along the height direction of the beam member 13. Each tension member 17 is arranged to pass through the second through hole 22 and the beam side through hole 23.

While tension is applied to each tension member 17, both ends are fixed to the outer surfaces of the corresponding second widened portions 16B of the two wall members 14 by the fixing devices 20. This introduces prestress to the beam member 13 and the wall member 14, and the second widened portions 16B of the wall member 14 are pressed against the corresponding beam member 13. At this time, the main body portion 15 is joined to the beam member 13 at its edge.

As shown in Figures 1 to 3, in this embodiment, the first widening portion 16A protrudes further in the thickness direction than the second widening portion 16B. In addition, the length of the pair of first widening portions 16A in the thickness direction is preferably shorter than the length of the beam member 13 and shorter than the length of the column member 12. This allows the wall joint structure of the building 1 to be made more compact.

The first through holes 18 are each positioned further outward in the thickness direction of the wall member 14 than the pair of second widening sections 16B. This ensures that the second widening sections 16B do not interfere with the tension material 17 extending horizontally even at the top and bottom of the first widening sections 16A.

The wall joint structure of the building 1 is configured as described above. In this embodiment, the wall member 14 can be joined to the column member 12 and the beam member 13 by the tendons 17. This makes it easy to join the wall member 14 to the column member 12 and the beam member 13. In addition, it is easy to construct the wall member 14 as a precast member.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to Fig. 4. The same or similar components as those in the first embodiment are denoted by the same reference numerals, and duplicated descriptions will be omitted. This embodiment differs from the first embodiment in that the wall member 14 does not have the first widening portion 16A.

Figure 4 is a side view of a portion of a building 1 to which a wall joint structure according to the second embodiment is applied. As shown in Figure 4, the wall member 14 is pressure-joined to the beam member 13 as in the first embodiment, but is not joined to the column member 12. A gap 21 is provided between the wall member 14 and the column member 12, which allows the column member 12 to deform during an earthquake, etc.

By configuring the wall joint structure in this manner, a prestressed concrete wall joint structure can be constructed even when the wall member 14 is not joined to the column member 12. In this embodiment, the tension members 17 are provided only in the second widening portion 16B, so the number of tension members 17 is reduced compared to the first embodiment. This reduces the cost of the tension members 17 and makes it easier to place and remove them.

In addition, the wall member 14 is crimped and joined vertically to the beam member 13 by the tendons 17, improving the bending strength of the wall joint structure.

Third Embodiment
Next, a third embodiment of the present invention will be described with reference to Fig. 5. The same or similar components as those in the first embodiment are denoted by the same reference numerals, and duplicated descriptions will be omitted. This embodiment differs from the first embodiment in that the wall member 14 does not have the second widening portion 16B.

Figure 5 is a side view of a portion of a building 1 to which a wall joint structure according to the third embodiment is applied. As shown in Figure 5, the wall member 14 is pressure-joined to the column member 12 as in the first embodiment, but is not joined to the beam member 13. A gap 21 is provided between the wall member 14 and the beam member 13, which allows the beam member 13 to deform in the event of an earthquake, etc.

By configuring the wall joint structure in this manner, a prestressed concrete wall joint structure can be constructed even when the wall member 14 is not joined to the beam member 13. In this embodiment, the tension members 17 are provided only in the first widening portion 16A, so the number of tension members 17 is smaller than in the first embodiment. This reduces the cost of the tension members 17 and makes it easier to place and remove them.

In addition, the wall member 14 is horizontally pressure-joined to the column member 12 by the tendons 17, improving the shear strength of the wall joint structure.

Fourth Embodiment
Next, a fourth embodiment of the present invention will be described with reference to Fig. 6. The same or similar components as those in the third embodiment are denoted by the same reference numerals, and duplicated descriptions will be omitted. This embodiment differs from the third embodiment in that the wall member 14 is divided in the width direction. Details are as follows.

Figure 6 is a plan cross-sectional view of a wall joint structure according to the fourth embodiment. As in the second embodiment, the wall member 14 is pressure-bonded to the column member 12 and is not joined to the beam member 13.

In this embodiment, the wall member 14 is divided into multiple parts in the longitudinal direction of the beam member 13. The wall member 14 includes a first wall division 14A, a second wall division 14B, and at least one third wall division 14C. The first wall division 14A is provided on one of the two edges in the width direction of the main body 15 and constitutes a portion including a pair of first widening portions 16A. The second wall division 14B is provided on the other of the two edges in the width direction of the main body 15 and constitutes a portion including a pair of first widening portions 16A. The third wall division 14C constitutes a portion between the first wall division 14A and the second wall division 14B. In this embodiment, multiple third wall divisions 14C are provided in the longitudinal direction of the beam member 13.

A recess 31 is provided on the joint surface 30 of the first wall division 14A that faces the corresponding column member 12. The recess 31 is recessed from the joint surface 30 toward the third wall division 14C. Similarly, a recess 31 is provided on the joint surface 30 of the second wall division 14B that faces the corresponding column member 12. The recess 31 is recessed from the joint surface 30 toward the third wall division 14C. The first wall division 14A, the second wall division 14B, and the third wall division 14C are connected by a plurality of connecting tendons 37.

The connecting tendons 37 are made of PC steel bars, PC steel wires, PC steel strands, high-strength reinforcing bars, or rods or cables made of fiber-reinforced plastic such as aramid fiber, carbon fiber, or glass fiber. The connecting tendons 37 are preferably used as unbonded PC tendons that are not bonded to the wall members 14. By making the connecting tendons 37 unbonded, residual deformation after the end of an earthquake is reduced, and the wall members 14 can be dismantled and reused after the building 1 is demolished.

Each connecting tension member 37, while tensioned, has both ends fixed to the fixing members 40 housed in the recesses 31 of the first wall division 14A and the second wall division 14B. This introduces prestress to the first wall division 14A, the second wall division 14B, and the third wall division 14C, and presses the third wall division 14C against the corresponding first wall division 14A and second wall division 14B. The fixing members 40 may be composed of, for example, an anchor plate, a washer, a nut, etc.

The first wall division 14A, the second wall division 14B, and the third wall division 14C each have a plurality of third through holes 39 formed at positions corresponding to the recesses 31 for inserting the connecting tendons 37. Each third through hole 39 extends horizontally along the longitudinal direction of the beam member 13. Each connecting tendon 37 is positioned to pass through the third through hole 39.

By configuring the wall joint structure in this way, the wall member 14 can be divided into multiple structures. Since each structure is made smaller by division, the transportation efficiency of the wall member 14 can be improved. In addition, by making the first wall division 14A, the second wall division 14B, and the third wall division 14C into separate divisions, each division can be made into a rectangular parallelepiped block. Therefore, compared to a case where the wall member 14 is not divided, the loading efficiency of the wall member 14 onto a transportation vehicle can be improved. Furthermore, since the crane for transporting the wall member 14 can be made smaller, construction costs can be reduced. In addition, the wall member 14 can be easily dismantled and reused. Furthermore, by adjusting the number of the third wall divisions 14C according to the distance between a pair of column members 12, the wall joint structure can be adapted to various spans.

In addition, in this embodiment, prestress is introduced from both ends of the connecting tendon 37 throughout its entirety. Therefore, there is no need to consider the anchoring length of the connecting tendon 37 as in the pretensioning method, and the length of the first wall segment 14A and the second wall segment 14B can be shortened in the width direction.

Fifth embodiment
Next, a fifth embodiment of the present invention will be described with reference to Fig. 7. The same or similar components as those in the second embodiment are denoted by the same reference numerals, and duplicated descriptions will be omitted. This embodiment differs from the second embodiment in that the wall member 14 is divided in the height direction. Details are as follows.

Figure 7 is a side view of a portion of a building 1 to which a wall joint structure according to the fifth embodiment is applied. As shown in Figure 7, the wall member 14 is pressure-joined to the beam member 13, as in the second embodiment, and is not joined to the column member 12.

In this embodiment, the wall member 14 is divided into multiple parts in the longitudinal direction of the column member 12. The wall member 14 includes a first wall division 14A, a second wall division 14B, and at least one third wall division 14C. The first wall division 14A constitutes a portion including a pair of second widening portions 16B provided on one of both edges in the height direction of the main body portion 15. The second wall division 14B constitutes a portion including a pair of second widening portions 16B provided on the other of both edges in the height direction of the main body portion 15. The third wall division 14C constitutes a portion between the first wall division 14A and the second wall division 14B. In this embodiment, multiple third wall divisions 14C are provided.

A recess 31 is provided on the joint surface 30 of the first wall section 14A that faces the corresponding beam member 13. The recess 31 is recessed from the joint surface 30 toward the third wall section 14C. Similarly, a recess 31 is provided on the joint surface 30 of the second wall section 14B that faces the corresponding beam member 13. The recess 31 is recessed from the joint surface 30 toward the third wall section 14C. The first wall section 14A, the second wall section 14B, and the third wall section 14C are connected by a connecting tendon 37.

While tension is applied to each connecting tension member 37, both ends are fixed to the fixing members 40 housed in the recesses 31 of the first wall division 14A and the second wall division 14B. This introduces prestress to the first wall division 14A, the second wall division 14B, and the third wall division 14C, and presses the third wall division 14C against the corresponding first wall division 14A and second wall division 14B.

The first wall division 14A, the second wall division 14B, and the third wall division 14C each have a plurality of third through holes 39 formed at positions aligned with the recesses 31 for inserting the connecting tension members 37. Each third through hole 39 extends vertically along the height direction of the column member 12. Each connecting tension member 37 is positioned to pass through the third through hole 39.

A filler may be filled between each of the partitions. That is, the filler may be filled between the first wall partition 14A and the second wall partition 14B, between the first wall partition 14A and the third wall partition 14C, or between the second wall partition 14B and the third wall partition 14C. Alternatively, the filler may be filled between adjacent third wall partitions 14C.

The filler is a fluid material that hardens over time, and may be, for example, non-shrinking mortar or cement milk. It is preferable to use fiber-reinforced mortar or low-elasticity, high-toughness mortar as the filler so that the filler is less likely to break after hardening.

During an earthquake, a large bending moment is generated in the wall member 14 due to the inertial force of lateral shaking. By configuring the wall joint structure in this way, instead of bending cracks occurring in the wall member 14, the first wall division 14A, the second wall division 14B, and the third wall division 14C are separated from each other, making the filler more likely to crack. This makes it possible to suppress damage to the wall member 14.

Although the description of the specific embodiment is now complete, the present invention is not limited to the above embodiment and can be modified in a wide range of ways. For example, in the above embodiment, the tension members 17 and the connecting tension members 37 are used as unbonded tension members, but they may be used as bonded tension members. The column members 12, the beam members 13, and the wall members 14 may be made of lightweight concrete to reduce the weight of the wall joint structure. Furthermore, the specific configuration, arrangement, quantity, material, procedure, etc. of each member or part may be changed as appropriate within the scope of the invention. On the other hand, not all of the components shown in the above embodiment are necessarily required, and may be selected as appropriate.

1: Building 2: Pillar 3: Beam 12: Pillar member (first structural member, second structural member)
13: Beam member (first structural member, second structural member)
14: Wall member 14A: First wall section 14B: Second wall section 14C: Third wall section 16: Widened portion 17: Tendon 18: First through hole 22: Second through hole 30: Joint surface 31: Recess 37: Connecting tendon 40: Anchoring member

Claims (8)

A first structural member made of precast concrete constituting one of a column and a beam;
a wall member made of precast concrete extending along the first structural member and joined to the first structural member;
A wall joint structure of a building comprising: a plurality of tendons for joining the wall member to the first structural member,
the wall member has a pair of widening portions extending along an edge portion joined to the first structural member and protruding on both sides in a thickness direction to widen the thickness of the wall member;
Each of the widening portions is formed with a first through hole for inserting the tendon,
A second through hole is formed in the first structural member at a position aligned with the first through hole,
A wall joint structure, wherein the tendon is arranged to pass through the first through hole and the second through hole. the building comprises a pair of the first structural members arranged parallel to each other,
The wall member is disposed between a pair of the first structural members and is joined to each of the pair of the first structural members, and has a pair of the widened portions on both edges joined to the pair of the first structural members. The wall joint structure described in claim 1. Further provided is a second structural member made of precast concrete constituting the other of the column and the beam;
The wall member has a pair of widened portions along edges that are joined to the second structural member, the pair extending along the second structural member and being joined to the second structural member. The wall joint structure according to claim 2 . The building comprises a pair of the second structural members arranged parallel to each other,
The wall member is disposed between a pair of the second structural members and is joined to each of the pair of the second structural members, and has a pair of the widened portions on both edges joined to the pair of the second structural members. The wall joint structure described in claim 3. the wall member is divided into a plurality of parts in the longitudinal direction of the first structural member, and includes a first wall division constituting a portion including the pair of widened portions provided on one of the both edge portions, a second wall division constituting a portion including the pair of widened portions provided on the other of the both edge portions, and a third wall division constituting a portion between the first wall division and the second wall division,
The wall connection structure according to claim 2 , further comprising a plurality of connecting tendons for connecting the first wall section, the second wall section and the third wall section. The wall joint structure according to claim 5, wherein each of the joint surfaces of the first wall division and the second wall division with respect to the corresponding structural member is provided with a recess for accommodating an anchoring member for anchoring the connecting tendon. A pair of the widened portions joined to the column protrude larger than a pair of the widened portions joined to the beam,
The wall joint structure described in claim 3, wherein the first through holes formed in a pair of the widening portions joined to the columns are positioned further outward in the thickness direction than the pair of the widening portions joined to the beams. The wall joint structure according to claim 7, in which the width in the thickness direction of the pair of widening sections joined to the columns is smaller than the width of the beam.

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