Endurance wall

Abstract

The present invention provides a load-bearing wall that prevents the diagonal members from expanding even when compressive force is applied to them, thereby preventing damage to the wall surface of the load-bearing wall from being pushed from the inside. [Solution] The load-bearing wall 1 is connected to a connecting member 4, which is fixed to the building's frame, by a mounting portion provided on the diagonal member 2. The mounting portion 22 on one side of the diagonal member 2 is provided with an end plate 22b having an insertion hole 22c in the direction of the centerline of the diagonal member 2, and a space S is formed between the end plate 22b and the connecting member 4, and a double-ended bolt 5 provided on either the end plate 22b side or the connecting member 4 and passed through the insertion hole 22c is screwed into a nut 63 on the other side, and the space S is reduced by the movement force of the nut 63 due to the screwing into the end plate 22b, thereby creating tension in the diagonal member 2, while the end plate 22b is allowed to move further in the direction that reduces the space S.

Description

Technical Field

[0001] The present invention relates to a bearing wall that resists horizontal loads by means of diagonal members.

Background Art

[0002] Patent Document 1 discloses a bearing wall in which mounting portions provided at both ends of a diagonal member are connected to connecting members fixed to a building frame. In this bearing wall, the mounting portion on one side of the diagonal member has an insertion hole in the center line direction of the diagonal member, the mounting portion on the one side and the connecting member are spaced apart from each other in the center line direction, a male screw portion provided on either one of the mounting portion on the one side and the connecting member and inserted through the insertion hole is screwed to a female screw portion on the other side, and the mounting portion on the one side is pulled toward the connecting member side by the movement of either one of the male screw portion and the female screw portion caused by the screwing.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, in the above-mentioned bearing wall, when a compressive force is applied to the diagonal member, the diagonal member bends, and there is a risk that the central portion of the diagonal member that bulges in the out-of-plane direction of the bearing wall pushes the wall surface from the inner side and causes damage.

[0005] In view of the above circumstances, an object of the present invention is to provide a bearing wall capable of suppressing bulging of a diagonal member even when a compressive force is applied to the diagonal member.

Means for Solving the Problem

[0006] The load-bearing wall according to this invention solves the above problem by having attachment parts provided at both ends of the diagonal members connected to connecting members fixed to the building frame, At least one mounting portion of the above-mentioned diagonal member is provided with an end plate having an insertion hole in the direction of the centerline of the diagonal member, A space is formed between the end plate and the connecting member in the direction of the center line. A male threaded portion, provided on either the end plate side or the connecting member and passed through the insertion hole, is screwed into a female threaded portion on the other side. The device is characterized in that, by applying the movement force of either the male screw portion or the female screw portion due to the screwing to the end plate, the space is reduced and tension is generated in the diagonal member, while the end plate is allowed to move further in the direction that reduces the space.

[0007] With the above configuration, tension can be applied to the diagonal member by the movement force of either the male screw portion or the female screw portion due to the screwing. Furthermore, when a compressive force is applied to the diagonal member during an earthquake, the end plate is allowed to move further in the direction that reduces the space, thus preventing the diagonal member from expanding due to the compressive force and preventing the diagonal member from pushing against the inner surface of the shear wall and causing damage.

[0008] The male threaded portion is fixed to the side of the connecting member, and the female threaded portion, which is a nut, is screwed onto the tip of the male threaded portion that passes through the insertion hole, and the movement force of this nut may be applied to the end plate.

[0009] An elastic member that compresses when pressed by the nut may be provided between the end plate and the nut. In this case, instead of the nut directly moving the end plate, the end plate is elastically pressed with a force corresponding to the amount of compression of the elastic member, and this elastic pressing force becomes the tension applied to the diagonal member. Since the elastic pressing force can be calculated from the amount of compression of the elastic member and the elastic constant, an appropriate initial tension can be applied to the diagonal member by turning the nut while measuring whether the amount of compression of the elastic member has reached the design compression amount. Furthermore, even when the end plate moves in a direction that compresses the space during an earthquake, the pressing state of the nut by the elastic member can be maintained, so loosening of the nut can also be suppressed.

[0010] Alternatively, the system may include an elastic member located in the space between the end plate and the connecting member, which is compressed by the end plate moved by the nut. This allows the elastic member to prevent the end plate from becoming loose and rattling even after the diagonal member has been subjected to tensile force and elongated.

[0011] The above-mentioned male threaded portion is a bolt with a head that passes through the above-mentioned insertion hole and is screwed into the above-mentioned female threaded portion on the side of the connecting member, and the movement force of this bolt may be applied to the end plate.

[0012] An elastic member that compresses when pressed by the bolt head may be provided between the end plate and the bolt head. In this case, instead of the end plate being directly moved by the bolt head, the end plate is elastically pressed with a force corresponding to the amount of compression of the elastic member, and by rotating the bolt while measuring whether the amount of compression of the elastic member has reached the design compression amount, an appropriate initial tension can be applied to the diagonal member. Furthermore, even when the end plate moves in a direction that compresses the space during an earthquake, the pressing state of the bolt head by the elastic member can be maintained, so loosening of the bolt can also be suppressed.

[0013] Alternatively, the system may include an elastic member located in the space between the end plate and the connecting member, which is compressed by the end plate moved by the bolt. This allows the elastic member to prevent the end plate from becoming loose and rattling even after the diagonal member has been subjected to tensile force and elongated.

[0014] The elastic member described above may be a coil spring fitted onto the male screw portion. [Effects of the Invention]

[0015] With this invention, even if a compressive force is applied to the diagonal member, it is possible to prevent the diagonal member from bending and bulging, thus preventing the wall surface of the load-bearing wall from being pushed from the inside by the diagonal member and being damaged. [Brief explanation of the drawing]

[0016] [Figure 1] This is an explanatory diagram showing the internal structure of the load-bearing wall in the embodiment. [Figure 2] Figure 1 is a magnified perspective view of the tensioning attachment point for the flat bar of the shear wall shown in Figure 1. [Figure 3] Figure 2 shows a perspective view of the mounting portion, which is shown in enlargement, from a different direction. [Figure 4] Figure 2 is an explanatory diagram illustrating that, in the mounting section shown, tension is applied to the diagonal member by the movement force of the nut, while in the event of an earthquake, when a compressive force is applied to the diagonal member, the end plate is allowed to move further in a direction that reduces the space. [Figure 5] This diagram illustrates a lower connecting member for tensioning a load-bearing wall in an embodiment equipped with an elastic member, demonstrating that appropriate initial tension can be applied to the diagonal member by measuring whether the compression amount of the elastic member has reached the design compression amount. [Figure 6] Figure 5 is an explanatory diagram showing the method for calculating the elastic constant of an elastic member in a load-bearing wall. [Figure 7]It is an explanatory diagram showing a lower connecting member according to another embodiment including an elastic member.

Mode for Carrying Out the Invention

[0017] Hereinafter, an embodiment according to one aspect of the present invention will be described with reference to the accompanying drawings. As shown in Figure 1, the shear wall 1 of this embodiment includes diagonal members 2 formed of flat bars arranged in a cross shape. A plate-shaped mounting portion 21 located on the upper end side of each diagonal member 2 is connected to an upper connecting member 3 located on the upper side of a column 100 which is a building frame. Similarly, a tensioning mounting portion 22 located on the lower end side of each diagonal member 2 is connected to a lower connecting member 4 located on the lower side of the column 100. That is, the shear wall 1 has a structure in which the mounting portions 21 and 22 provided at both ends of the diagonal members 2 formed of flat bars, with their main surfaces (surface sides) positioned parallel to the wall surface within the wall surface, are connected to the connecting members 3 and 4 on the building frame side. In addition, the shear wall 1 is provided with battens, plywood, gypsum board, etc. on the outer surface side of such an internal structure.

[0018] For example, a through-hole is formed in the mounting portion 21 on the upper side of the diagonal member 2 in a direction orthogonal to the wall surface of the shear wall 1, and a through-hole is also formed in the upper connecting member 3 in a direction orthogonal to the wall surface of the shear wall 1. The bolt of the bolt-nut 7 is inserted through the through-hole, and the nut is tightened onto the bolt, whereby the mounting portion 21 is fixed to the upper connecting member 3. Note that the nut of the bolt-nut 7 may be fixed to the upper connecting member 3 by welding or the like.

[0019] On the other hand, the lower mounting portion 22 for tensioning, as shown in Figures 2 and 3, comprises two flange plates 22a, one end of which is fixed to each edge (narrow side) of the diagonal member 2 by welding, and an end plate 22b fixed to the other end of these flange plates 22a. The end plate 22b has a roughly rectangular shape, and the other ends of each flange plate 22a are welded to its side, which is arranged in a reversed configuration. The end plate 22b is spaced apart from the end face of the diagonal member 2, and the threaded portion (male thread) of the double-ended bolt 5, which will be described later, is positioned at this spaced-away location. An insertion hole 22c is formed in the center of the end plate 22b in the direction of the center line of the diagonal member 2. The threaded portion of the double-ended bolt 5 is passed through the insertion hole 22c, and a nut 63, which is the female thread, is screwed onto the tip of the threaded portion.

[0020] The mounting plate portion 41 of the lower connecting member 4 is fixed to the opposing side of adjacent columns 100 by welding or the like. Two gusset plates 42, which are spaced apart in the wall thickness direction of the load-bearing wall 1, are fixed to the mounting plate portion 41 by welding or the like.

[0021] A connecting plate 43 is fixed to the upper end of the gusset plate 42, facing the end plate 22b. A space S is formed between the end plate 22b and the connecting plate 43 in the direction of the centerline. The connecting plate 43 protrudes from the two gusset plates 42 and is welded to the two gusset plates 42 on the outside of this protrusion. In addition, a screw hole 43a is formed in the connecting plate 43 in the direction of the centerline of the diagonal member 2, and one end of a double-ended bolt 5 is screwed into this screw hole 43a, with the threaded portion of the double-ended bolt 5 protruding upward.

[0022] Furthermore, the mounting portion 22 has a locking member 221 located away from the diagonal member 2 that engages with the connecting plate 43 of the lower connecting member 4. Since the wider side of the locking member 221 is parallel to the wall surface, there are no size constraints on the wider side, and it makes broad contact with the side surface of the connecting plate 43, preventing rotation of the mounting portion 22 about the center line of the diagonal member 2.

[0023] As shown in Figure 4, when the nut 63, which is screwed onto the threaded portion of the double-ended bolt 5 protruding from the end plate 22b, is screwed in, the nut 63 moves downward, and the end plate 22b is pulled towards the connecting plate 43. In other words, the mounting portion 22 of the diagonal member 2 is connected to the lower connecting member 4 by the screwing of the threaded portion of the double-ended bolt 5 and the nut 63, and is also pulled towards the lower connecting member 4 by the displacement of the nut 63 due to the screwing in of the nut 63. This pulling reduces the space S mentioned above, thereby generating the necessary tension for the diagonal member 2.

[0024] Here, since the nuts positioned on the underside of the end plate 22b to sandwich the end plate 22b with nuts 63 are not screwed onto the threaded portion of the double-ended bolt 5, the end plate 22b is allowed to move further in the direction that reduces the space S.

[0025] With the above configuration, tension can be applied to the diagonal member 2 by the movement force of the nut 63, which is the female threaded part, due to the screwing of the double-ended bolt 5, which is the male threaded part, and the nut 63, which is the female threaded part. Furthermore, when a compressive force is applied to the diagonal member 2 during an earthquake, the end plate 22b is allowed to move further in the direction that shrinks the space S, thereby preventing the diagonal member 2 from bending and bulging due to the compressive force, and preventing the wall surface of the shear wall 1 from being pushed from the inner side by the diagonal member 2 and being damaged.

[0026] Figure 5 shows another embodiment. In this embodiment, the shear wall 1 is equipped with an elastic member 8 between the end plate 22b and the nut 63, which compresses when pressed by the nut 63. In this example, the elastic member 8 is a coil spring fitted onto the threaded portion of the double-ended bolt 5, which is the male threaded portion. In on-site construction of the shear wall 1, for example, the mounting portion 21 on the other side of the diagonal member 2 is first connected to the upper connecting member 3 with a bolt and nut 7 (see Figure 1). In this connected state, the mounting portion 22 on one side is spaced apart from the connecting plate 43, forming a space. In this spaced-apart state, the threaded portion of the double-ended bolt 5 provided on the lower connecting member 4 side is passed through the insertion hole 22c and protrudes upward, and the nut 63 can be screwed onto this protruding threaded portion.

[0027] In this embodiment of the shear wall 1, the end plate 22b is not directly moved by the nut 63. Instead, the end plate 22b is elastically pressed with a force corresponding to the amount of compression (L0-L1) of the elastic member 8, and this elastic pressing force becomes the initial tension applied to the diagonal member 2. Since the above elastic pressing force can be calculated from the amount of compression and the elastic constant (spring constant) of the elastic member 8, the appropriate tension can be applied to the diagonal member 2 by turning the nut 63 while measuring whether the compressed length of the elastic member 8, whose natural length is L0, has reached the design length L1. Note that the length L1 is obtained at a stage where the spring wires do not come into contact with each other.

[0028] Furthermore, when an earthquake occurs, the end plate 22b moves in a direction that compresses the space S, and the compressed length of the elastic member 8 becomes L2, which is greater than L1, the pressing state of the elastic member 8 on the nut 63 can be maintained, thus preventing the nut 63 from loosening. Similarly, when the compressed length of the elastic member 8 becomes L2 due to elongation of the diagonal member 2 caused by an earthquake, the pressing state of the elastic member 8 on the nut 63 can be maintained, thus preventing the nut 63 from loosening.

[0029] [Determination of the length and spring constant of the coil spring, which is the elastic component 8] In order for the elastic member 8 (coil spring) to continue functioning as a locking mechanism for the nut 63 even after the diagonal member 2 has elongated due to tensile force, it is necessary that L0-L1 > L0-L2, as shown in Figures 6(a) and (b). Furthermore, the amount of change required from tension to compression of the diagonal member 2 (the difference Δ(=cd) between the diagonal member length c during tension (due to the elongation of the diagonal member 2) and the diagonal member length d during compression (due to the contraction of the space S)) must satisfy L0-L1 > Δ > L0-L2.

[0030] Assuming the dimensions of each part of the shear wall 1 are as shown in Figure 6(a), and assuming a deformation angle of 1 / 50, L0-L1 > Δ (= 34.5 mm) > L0-L2, it is necessary to select a coil spring that can be tightened by 34.5 mm or more to obtain the initial introduction tension. If the initial introduction tension T in this case is 15 kN, and the spring constant of the elastic member 8 (coil spring) is k, then T = k × (L0-L1) = 15 kN, and k < 434.8 (N / mm).

[0031] Alternatively, instead of the mounting portion 21 on the other side of the diagonal member 2 and the upper connecting member 3 to which this mounting portion 21 is attached, a configuration may be provided on the upper side of the diagonal member 2 that forms a space S as described above and uses an elastic member 8. With such a double-sided elastic configuration, the required length for tightening the elastic member 8 (coil spring) on ​​each side can be halved. However, in these configurations, reducing the spring constant k increases the required length for tightening the coil spring, which is undesirable from an installation standpoint.

[0032] Figure 7 shows another embodiment. In this embodiment, the shear wall 1 is equipped with an elastic member 8A between the end plate 22b and the connecting plate 43, which compresses when it receives the pressing force of the nut 63 via the end plate 22b. In this example, the elastic member 8A is a coil spring fitted onto the threaded portion of the double-ended bolt 5, which is the male threaded portion. In this configuration, the amount of compression of the elastic member 8A does not represent the initial tension value for introduction into the diagonal member 2, but even after the diagonal member 2 is subjected to tensile force and elongates, the presence of the elastic member 8A (coil spring) prevents the end plate 22b from becoming free and causing rattling.

[0033] In the example described above, the threaded portion of the double-ended bolt 5 was passed through the insertion hole 22c, and a nut 63, which is the female threaded portion, was screwed onto the tip of the threaded portion. However, the configuration is not limited to this. For example, the threaded hole 43a of the connecting plate 43 could be used as the female threaded portion, and the threaded portion (male threaded portion) of a headed bolt could be inserted into this threaded hole 43a from the mounting portion 22 side and screwed into the threaded hole 43a. With such a configuration, screwing in the headed bolt would provide its moving force to the end plate 22b, thereby applying appropriate initial tension to the diagonal member 2.

[0034] Furthermore, in this configuration, an elastic member 8 that compresses when pressed by the head of the headed bolt may be provided between the end plate 22b and the head of the headed bolt. With this configuration, instead of the end plate 22b being directly moved by the head of the bolt, the end plate 22b is elastically pressed with a force corresponding to the amount of compression of the elastic member 8, and by rotating the headed bolt while measuring whether the amount of compression of the elastic member 8 has reached the design compression amount, an appropriate initial tension can be applied to the diagonal member 2. In addition, even when the end plate 22b moves in a direction that compresses the space S during an earthquake, the pressing state of the head of the headed bolt by the elastic member can be maintained, so that the loosening of the headed bolt can also be suppressed.

[0035] Furthermore, in the configuration shown in Figure 7, similar to the above, the headed bolts, etc., can be used instead of the double-ended bolts 5 and nuts 63.

[0036] Furthermore, in these configurations, the male and female screw parts that provide the tension were configured as a single unit in each mounting part 22, but they may also be configured as a multi-unit unit.

[0037] Although embodiments of this invention have been described above with reference to the drawings, this invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as this invention, or within the equivalent scope. [Explanation of symbols]

[0038] 1: Load-bearing wall 2: Diagonal material 3: Upper connecting member 4: Lower connecting member 5: Double-ended bolt (male threaded portion) 7: Nut 8: Elastic member 8A: Elastic member 21: Mounting part 22: Mounting part 22a: Flange plate 22b: End plate 22c: Through hole 41: Mounting plate section 42: Gusset Plate 43: Connection plate 43a: Screw hole 63: Nut (female threaded part) 100: Pillar 221: Locking member S: Spatial part

Claims

1. A load-bearing wall in which attachment parts provided at both ends of the diagonal member are connected to connecting members fixed to the building's structure, At least one mounting portion of the above-mentioned diagonal member is provided with an end plate having an insertion hole in the direction of the centerline of the diagonal member, A space is formed between the end plate and the connecting member in the direction of the center line. A male threaded portion, provided on either the end plate side or the connecting member and passed through the insertion hole, is screwed into a female threaded portion on the other side. A load-bearing wall characterized in that, by applying the movement force of either the male screw portion or the female screw portion due to the screwing to the end plate, the space is reduced and tension is generated in the diagonal member, while the end plate is allowed to move further in the direction that reduces the space.

2. A load-bearing wall according to claim 1, characterized in that the male screw portion is fixed to the side of the connecting member, a nut which is the female screw portion is screwed onto the tip side of the male screw portion that is passed through the through hole, and the movement force of this nut is applied to the end plate.

3. A load-bearing wall according to claim 2, characterized in that an elastic member that compresses when pressed by the nut is provided between the end plate and the nut.

4. A load-bearing wall according to claim 2, characterized in that it comprises an elastic member located in the space between the end plate and the connecting member, which is compressed when pressed by the end plate that is moved by the nut.

5. A load-bearing wall according to claim 1, characterized in that the male threaded portion is a bolt with a head that passes through the insertion hole and is screwed into the female threaded portion on the connecting member side, and the movement force of this bolt is applied to the end plate.

6. A load-bearing wall according to claim 5, characterized in that an elastic member that compresses when pressed by the head of the bolt is provided between the end plate and the head of the bolt.

7. A load-bearing wall according to claim 5, characterized in that it comprises an elastic member located in the space between the end plate and the connecting member, which is compressed when pressed by the end plate that is moved by the bolt.

8. A load-bearing wall according to any one of claims 3, 4, 6, or 7, characterized in that the elastic member is a coil spring fitted onto the male screw portion.

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