Endurance wall

Abstract

The present invention provides a load-bearing wall that prevents the diagonal members from bulging out of plane even when compressive force is applied to them, thereby preventing damage to the wall surface from being pushed from the inner side. [Solution] The load-bearing wall 1 has mounting parts 21 and 22 provided on the diagonal member 2 that are connected to a connecting member 4 fixed to the building's frame. The diagonal member 2 consists of a divided diagonal member section 2A and a divided diagonal member section 2B, and the ends of the divided diagonal member sections 2A and 2B are connected to each other by a connecting part 2C. The connecting part 2C includes an elongated hole 201 formed in the divided diagonal member section 2A and having a predetermined length in the direction of the centerline of the divided diagonal member section 2A, and an engaging part 202 attached to the divided diagonal member section B and movably engaging with the elongated hole 201, and tension is applied to the diagonal member 2 when the engaging part 202 is positioned at the end of the elongated hole 201.

Description

Technical Field

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

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 extending 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 side of the mounting portion on the one side and the connecting member and inserted through the insertion hole is screwed with 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-described bearing wall, when a compressive force is applied to the diagonal member during inter-story deformation of a building caused by an earthquake, the diagonal member bends, and there is a risk that the central portion of the diagonal member bulging in the out-of-plane direction of the bearing wall presses the wall surface from the inner surface 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 the 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, The above diagonal member consists of multiple segmented diagonal member sections, and the ends of these segmented diagonal member sections are connected to each other by connecting parts. The above-described connecting portion comprises a hole formed in one of the divided diagonal members having a predetermined length in the longitudinal direction of the diagonal member, and an engaging portion attached to the other divided diagonal member and movably engaging with the hole, characterized in that tension is applied to the diagonal member when the engaging portion is located at the end of the hole.

[0007] With the above configuration, when a compressive force is applied to the diagonal member, the engaging portion in the connecting portion moves within the hole, causing the diagonal member to temporarily shorten. This prevents the diagonal member from expanding due to the compressive force and prevents the diagonal member from pushing against the inner surface of the load-bearing wall and causing damage.

[0008] The other or one of the divided diagonal members described above may be stacked in pairs, with the ends of the one or the other divided diagonal member sandwiched between the two stacked diagonal members. This makes it easier to align the centerline direction of the diagonal member with the load line direction.

[0009] The pair of the first and second diagonal members are arranged in a cross shape, and the connecting portion of these diagonal members may be located off-center from the center of the diagonal members. This makes it possible to avoid interference between the connecting portions of the cross-arranged diagonal members.

[0010] Alternatively, the pair of first and second diagonal members are arranged in a cross configuration, with the connecting portion of each diagonal member positioned off-center from the center of the diagonal member, and the double-layered divided diagonal member section and the single divided diagonal member section intersect at the center of the pair of diagonal members, with the single divided diagonal member section passing through the gap between the double-layered divided diagonal member section. This configuration makes it easy to align the centerline direction and the load line direction of each diagonal member in such a cross configuration.

[0011] The above-mentioned connecting portion may have multiple sets of the above-mentioned holes and engaging portions. This makes it possible to prevent the connecting portion from bending outward in the direction of the centerline of the diagonal member due to a hinge structure resulting from one hole and one engaging portion.

[0012] The width of the connecting portion of the diagonal member may be wider than the width of the main body. This makes it easier to prevent damage to the connecting portion even if stress concentration occurs at the end of the hole when the diagonal member is pulled.

[0013] In these load-bearing walls, at least one mounting portion of the 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 space may be reduced and tension generated in the diagonal member by applying the movement force of either the male screw portion or the female screw portion due to the screwing together to the end plate.

[0014] In this case, if there are construction errors during the initial construction of the building, the expected rigidity may not be achieved when the diagonal members are tensed. Generally, such problems are not easy to avoid because they depend on the precision of the building members and the overall verticality of the building. In contrast, by providing a tensioning mechanism at the ends of the diagonal members as described above, tension can be accurately and easily generated in the diagonal members, allowing the load-bearing wall to exhibit the expected rigidity from the beginning.

[0015] In the above shear wall, the male screw portion is fixed to the connecting member side, and a nut serving as the female screw portion is screwed onto the distal end side of the male screw portion inserted through the insertion hole, and the moving force of this nut may be applied to the end plate. Alternatively, the male screw portion is a headed bolt that is screwed through the insertion hole into the female screw portion on the connecting member side, and the moving force of this bolt may be applied to the end plate.

Effects of the Invention

[0016] According to the present invention, even when a compressive force is applied to a diagonal member, bending and bulging of the diagonal member can be avoided, so that the effect of suppressing damage to the wall surface of the shear wall caused by being pushed from the inner surface side by the diagonal member can be achieved.

Brief Description of the Drawings

[0017] [Figure 1] It is an explanatory diagram showing the internal structure of the shear wall of the embodiment. [Figure 2] It is an enlarged perspective view showing a tension mounting portion of a flat bar of the shear wall shown in FIG. 1. [Figure 3] It is a perspective view of the mounting portion, which is shown enlarged in FIG. 2, viewed from another direction. [Figure 4] It is an explanatory diagram showing that tension is applied to the diagonal member by the moving force of the nut in the mounting portion shown in FIG. 2. [Figure 5] It is an explanatory diagram showing the state of the connecting portion when an appropriate initial introduction tension is applied to the diagonal member (this is also the state under tension) in the shear wall of the embodiment. [Figure 6] In FIG. 5, it is an explanatory diagram showing the state of the connecting portion when a compressive force is applied to the diagonal member. [Figure 7] It is an explanatory diagram showing a method of calculating the length of an elongated hole of a connecting portion in the shear wall of the embodiment. [Figure 8] It is an explanatory diagram showing the state of the connecting portion when an appropriate initial introduction tension is applied to the diagonal member (this is also the state under tension) in a shear wall of another embodiment. [Figure 9]Fig. 8 is an explanatory diagram showing the state of the connecting portion when a compressive force is applied to the diagonal member. MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, an embodiment according to one aspect of the present invention will be described with reference to the accompanying drawings. As shown in Fig. 1, the shear wall 1 of this embodiment includes a first diagonal member 2 (2α) and a second diagonal member 2 (2β) formed of flat bars arranged in a cross shape. A 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 frame of a building. Similarly, a tensioning (tension applying) 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 mounting portions 21 and 22 provided at both ends of the diagonal member 2 formed of a flat bar whose main surface side (front surface side) is positioned parallel to the wall surface within the wall surface are connected to connecting members 3 and 4 on the building frame side. In addition, the shear wall 1 is provided with battens, plywood, gypsum board, and the like on the outer surface side of such an internal structure.

[0019] In this example, the mounting portion 21 on the upper side of the diagonal member 2 has a configuration similar to that of the mounting portion 22, but does not have a tensioning function. As a structure not provided with a tensioning function, for example, a plate member having a through hole formed in a direction orthogonal to the wall surface of the shear wall 1 is fixed to the upper side of the diagonal member 2, 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, a bolt is inserted through the through hole, and a nut is tightened onto the bolt, whereby the mounting portion 21 is fixed to the upper connecting member 3. Such a structure may also be adopted.

[0020] 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.

[0021] 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.

[0022] A connecting plate 43 is fixed to the upper ends of the two gusset plates 42, facing the end plate 22b. 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 center line of the diagonal member 2, and the threaded portion of the double-ended bolt 5 protrudes upward from this screw hole 43a, and a clamping nut 61 is screwed onto the threaded portion of the double-ended bolt 5 on the upper surface of the connecting plate 43.

[0023] The threaded portion of the double-ended bolt 5 is inserted through the insertion hole 22c of the end plate 22b, and the threaded portion of the double-ended bolt 5 protrudes at the aforementioned gap between the end plate 22b and the end of the diagonal member 2. On the lower surface of the end plate 22b, a clamping nut 62 is screwed onto the threaded portion of the double-ended bolt 5 in the middle, and on the upper surface of the end plate 22b, a female threaded nut 63 is screwed onto the threaded portion of the double-ended bolt 5 that protrudes at the aforementioned gap.

[0024] Even when a predetermined tension is applied to the diagonal member 2, the separation between the end plate 22b of the mounting portion 22 and the connecting plate 43 is maintained. When the predetermined tension is applied as described above, the nut 62 is tightened on the underside of the end plate 22b, which prevents the nut 63 from loosening.

[0025] 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.

[0026] 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 spaced-out area, 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 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 and generates the necessary tension for the diagonal member 2.

[0027] In this case, if there are construction errors during the initial construction of the building, the expected rigidity may not be achieved when the diagonal members are tensed. Generally, such problems are not easy to avoid because they depend on the manufacturing precision of the building members and the overall verticality of the building. In contrast, by providing a tensioning mechanism at the end of the diagonal member as described above, tension can be accurately and easily generated in the diagonal member 2, and the load-bearing wall 1 can achieve the expected rigidity from the beginning.

[0028] The diagonal member 2 consists of one divided diagonal member section 2A and the other divided diagonal member section 2B, and the ends of these divided diagonal member sections 2A and 2B are connected to each other by a connecting section 2C. As shown in Figure 5, the connecting section 2C has an elongated hole 201 (hole) formed in one divided diagonal member section 2A that is long in the direction of the center line of the divided diagonal member section 2A, and an engaging section 202 that is attached to the other divided diagonal member section 2B and movably engages with the elongated hole 201, and the tension is applied to the diagonal member 2 when the engaging section 202 is positioned at the end of the elongated hole 201. Figure 6 shows the state of the connecting section 2C when a compressive force is applied to the diagonal member 2 in Figure 5.

[0029] As an example, the other divided diagonal member section 2B is made of two layers, and the end of one divided diagonal member section 2A (for example, the thickness of the divided diagonal member section 2A is twice that of the divided diagonal member section 2B) is sandwiched between the two layers of divided diagonal member sections 2B (gap), and the engaging portion 202 of the connecting portion 2C is supported by the two layers of divided diagonal member sections 2B through the elongated hole 201. The connecting portion 2C is equipped with, for example, a bolt, a nut, and a washer, with the shaft of the bolt positioned in the elongated hole 201, and the two layers of divided diagonal member sections 2B are sandwiched by a predetermined tightening force from the bolt. The tightening force is such that it allows movement (sliding) of the bolt, nut, and washer, and does not cause the bolt to loosen.

[0030] Furthermore, the connecting portion 2C of each diagonal member 2 is positioned away from the center of the diagonal member 2, and the double-layered divided diagonal member portion 2B of the first diagonal member 2 (2α) and the single divided diagonal member portion 2A of the second diagonal member 2 (2β) intersect at the center of these paired diagonal members 2, with the single divided diagonal member portion 2A of the second diagonal member 2 (2β) passing through the gap in the double-layered divided diagonal member portion 2B of the first diagonal member 2 (2α).

[0031] As shown in Figures 7(a) and 7(b), assuming the dimensions of each part of the shear wall 1 and a deformation angle of 1 / 50, Δ(=cd) = 34.5 mm. In this case, it is desirable to make the length of the elongated hole 201 approximately 40 mm. Alternatively, a circular hole may be used instead of the elongated hole 201, with a diameter of approximately 40 mm.

[0032] 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, as shown in Figure 5. Furthermore, when a compressive force is applied to the diagonal member 2 during an earthquake, as shown in Figure 6, the engaging part 202 of the connecting part 2C moves within the elongated hole 201, temporarily shortening the length of the diagonal member 2. This prevents the diagonal member 2 from bulging out of plane due to the compressive force, and prevents the diagonal member 2 from pushing against the wall surface of the load-bearing wall 1 from the inner side and causing damage.

[0033] Furthermore, if the other divided diagonal member section 2B is made up of two overlapping pieces, and the end of one divided diagonal member section 2A is sandwiched between these two overlapping divided diagonal member sections 2B, it becomes easier to align the centerline direction of the diagonal member 2 with the load line direction.

[0034] Furthermore, when the paired first diagonal member 2α and second diagonal member 2β are arranged in a cross configuration, and the double-layered divided diagonal member section 2B and the single divided diagonal member section 2A intersect at the center of the diagonal members, and the single divided diagonal member section 2A passes through the gap in the double-layered divided diagonal member section 2B, it becomes easy to align the centerline direction and the load line direction of each diagonal member 2 in such a cross configuration. Note that interference can be avoided by making both the divided diagonal member section 2A and the divided diagonal member section 2B from a single plate and offsetting their axes, but in this configuration, the axes will be eccentric with respect to the load line.

[0035] Furthermore, in the above example, the double-layered divided diagonal member section 2B holds the engaging portion 202 of the connecting portion 2C, and the single divided diagonal member section 2A has the elongated hole 201. However, conversely, it is also possible for the double-layered divided diagonal member section 2B to have the elongated hole 201 of the connecting portion 2C, and the single divided diagonal member section 2A to hold the engaging portion 202.

[0036] Figure 8 shows a modified example of shear wall 1, called shear wall 1A. In this shear wall 1A, the connecting portion 2C has two sets of elongated holes 201 and engaging portions 202 arranged in series. This prevents the diagonal member 2 from bending outward in the direction of its centerline due to the hinge action caused by the connecting portion 2C consisting of one elongated hole 201 and one engaging portion 202. Alternatively, the connecting portion 2C may have two sets of elongated holes 201 and engaging portions 202 arranged in parallel. The parallel elongated holes 201 in these two sets are parallel to the centerline direction of the divided diagonal member portion 2A (the longitudinal direction of the diagonal member 2) and are located at an equidistant distance from the centerline.

[0037] Furthermore, in the load-bearing wall 1A, the width of the connecting portion 2C is wider than the width of the main body side of the diagonal member 2. This makes it easier to prevent damage to the connecting portion 2C even if stress concentration occurs at the end of the elongated hole 201 when the diagonal member 2 is tensile. The width of the connecting portion 2C is, for example, made larger than the width of the main body side of the diagonal member 2 by the width of the elongated hole 201.

[0038] 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 the 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.

[0039] 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]

[0040] 1: Load-bearing wall 1A: Load-bearing wall 2: Diagonal material 2A: Split diagonal section 2B: Split diagonal section 2C: Connecting part 2α: First diagonal member 2β: Second diagonal member 3: Upper connecting member 4: Lower connecting member 5: Double-ended bolt 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 61: Nut 62: Nut 63: Nut 100: Pillar 201: Long hole 202: Engaging part 221: Locking member

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, The above diagonal member consists of multiple segmented diagonal member sections, and the ends of these segmented diagonal member sections are connected to each other by connecting parts. The above-mentioned connecting portion comprises a hole formed in one divided diagonal member portion having a predetermined length in the longitudinal direction of the diagonal member, and an engaging portion attached to the other divided diagonal member portion and movably engaging with the hole, characterized in that tension is applied to the diagonal member when the engaging portion is located at the end of the hole.

2. A load-bearing wall according to claim 1, characterized in that the other or one of the divided diagonal members is stacked in two layers, and the end of the one or the other divided diagonal member is sandwiched between the two stacked divided diagonal members.

3. A load-bearing wall according to claim 1, characterized in that a pair of first diagonal members and second diagonal members are arranged in a cross shape, and the connecting portions of these diagonal members are located off-center from the central portion of each diagonal member.

4. A load-bearing wall according to claim 2, wherein a pair of first diagonal members and second diagonal members are arranged in a cross shape, the connecting portions of these diagonal members are located off-center from the center of each diagonal member, and the double-layered divided diagonal member portion and the single divided diagonal member portion intersect at the center of the pair of diagonal members, and the single divided diagonal member portion passes through the gap between the double-layered divided diagonal member portion.

5. A load-bearing wall according to claim 1, characterized in that the connecting portion has a plurality of sets of the hole portion and the engaging portion.

6. A load-bearing wall according to claim 1, characterized in that the width of the connecting portion of the diagonal member is wider than the width of the main body side.

7. In the load-bearing wall according to any one of claims 1 to 6, at least one mounting portion of the 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 by applying a moving force to the end plate by the screwing of either the male screw portion or the female screw portion, thereby reducing the space and creating tension in the diagonal member.

8. A load-bearing wall according to claim 7, 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.

9. A load-bearing wall according to claim 7, 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.

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