Endurance wall

Abstract

Even if the size of the mounting portion in the wall thickness direction provided at the tensioned end of the diagonal member is reduced, a decrease in the strength of the mounting portion is prevented, and rotation of the diagonal member around the center line at the mounting portion on one side is accurately prevented by the locking member. [Solution] In the load-bearing wall 1, a tensioning attachment part 22 provided on a diagonal member 2, which is a flat bar with its main surface positioned parallel to the wall surface, is connected to a connecting member 4 on the column 100 side of the building. The attachment part 22 is equipped with a substantially rectangular end plate 22b, and the other ends of two flange plates 22a, one end of which is fixed to each edge of the end of the diagonal member 2, are fixed to the opposite side of the end plate 22b. The tip of a locking member 221, whose base end is fixed to a side different from the opposite side and to a part of one edge of the flange plate 22a, is locked to the connecting member 4.

Description

Technical Field

[0001] This invention relates to a shear wall that resists horizontal loads by diagonal members.

Background Art

[0002] Patent Document 1 discloses a shear wall in which attachment parts provided at both ends of a diagonal member are connected to connection members fixed to the building frame. In this shear wall, one attachment part on one side of the diagonal member has an insertion hole in the center line direction of the diagonal member, the one attachment part on the one side and the connection member are separated in the center line direction, and either the male screw part provided on one side of the one attachment part and the connection member and passed through the insertion hole or the female screw part on the other side is screwed together, and the one attachment part is pulled toward the connection member side by the movement of either one due to the screwing of the male screw part and the female screw part.

[0003] Further, in this shear wall, the rotation around the center line of the diagonal member in the one attachment part has a structure in which the rotation is prevented by a locking member provided in the attachment part being locked to the connection member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the above shear wall, when the column size is reduced and the wall thickness is accordingly thinned, it is necessary to reduce the size in the wall thickness direction in the attachment part and the locking member provided at the end of the tension side of the diagonal member. However, this may reduce the strength of the attachment part and the locking member.

[0006] The object of this invention is to provide a load-bearing wall that prevents a decrease in the strength of the mounting portion provided at the tensioned end of the diagonal member, even when the size of the mounting portion in the wall thickness direction is reduced, and that can accurately prevent rotation of the diagonal member around the center line at the mounting portion on one side by the locking member. [Means for solving the problem]

[0007] The load-bearing wall according to this invention is a load-bearing wall in which, in order to solve the above problem, mounting portions provided at both ends of a diagonal member made of a flat bar whose main surface is positioned parallel to the wall surface are connected to a connecting member on the building's structural side, The mounting portion on one side of the above-mentioned diagonal member is positioned spaced apart from the end face of the diagonal member and comprises a substantially rectangular end plate having an insertion hole in the direction of the centerline of the diagonal member, and the other ends of two flange plates, one end of which is fixed to each edge of the end of the diagonal member, are fixed to the opposite sides of the end plate. The mounting portion on one side and the connecting member are spaced apart in the direction of the centerline. The mounting portion on one side and the connecting member are provided on either side and the male threaded portion is passed through the insertion hole, and the female threaded portion on the other side is screwed together. The movement of either the male screw portion or the female screw portion due to the screwing motion causes the mounting portion on one side to be pulled toward the connecting member. The tip of a locking member, whose base end is fixed to a side of the end plate that is different from the side of the reversed arrangement described above, and to a part of the edge of one side of the flange plate, is locked to the connecting member, thereby preventing rotation of the diagonal member about the center line of the mounting portion on one side.

[0008] With the above configuration, the locking member is fixed at its base end to a side of the end plate different from the side of the reversed arrangement and to a part of one edge of the flange plate. As a result, the flange plate and the locking member are fixed to the end plate in a U-shape, and even if the size of the flange plate and the end plate in the wall thickness direction provided at the tensioned end of the diagonal member is reduced, a decrease in the strength of the mounting portion can be prevented. Furthermore, since the wider side of the locking member is parallel to the wall surface, there are no particular size constraints on the wider side, and rotation around the center line of the diagonal member at the mounting portion on one side can be accurately prevented.

[0009] The unfixed region of the flange plate in which the locking member is not fixed may have a length such that it deforms in the in-plane direction of the wall surface before the male screw portion due to the load applied to the diagonal member by inter-story deformation during an earthquake. In this case, since the unfixed region deforms in the in-plane direction of the wall surface before the male screw portion, bending fracture of the female screw portion due to an earthquake can be prevented.

[0010] The connecting member to which the above-mentioned mounting portion on one side is connected is equipped with a headed bolt as the male threaded portion, the threaded portion of this headed bolt is inserted through the insertion hole, and a nut as the female threaded portion may be screwed onto the inserted threaded portion.

[0011] The above-mentioned connecting member has two gusset plates spaced apart in the wall thickness direction of the load-bearing wall, and the spacing between the gusset plates may be wider than the width of the head of the headed bolt and also wide enough so that the head does not rotate. This eliminates the need to hold the headed bolt in place with a tool to prevent it from rotating, thus improving workability.

[0012] The mounting portion on the other side, located opposite the one side mentioned above, is attached to the upper side of the shear wall, and this mounting portion on the other side is also positioned spaced apart from the other end face of the diagonal member, and is equipped with a substantially rectangular end plate on the other side having an insertion hole in the direction of the centerline of the diagonal member, and the other ends of two flange plates, each with one end fixed to the edge of the end of the diagonal member, are fixed to the opposite sides of the other end plate, respectively. The connecting member on the other side, which is connected to the mounting portion on the other side, has a connecting portion-side insertion hole in the direction of the centerline of the diagonal member and has two gusset plates spaced apart in the wall thickness direction of the load-bearing wall, and the spacing between the gusset plates is wider than the width of the head of the headed bolt and is such that the head does not rotate. The threaded portion of the headed bolt may be inserted from above into the through-hole on the connection side of the other connecting member, and a nut may be screwed onto the threaded portion on the lower side of the end plate of the other side, thereby tightly fixing the end plate of the other side to the other connecting member. This improves the ease of installation of the other side connection. In other words, when inserting the threaded portion of the headed bolt from above into the through-hole on the connection side of the other connecting member and tightening the nut from below, it is not necessary to hold the head with a tool, thus improving ease of installation. [Effects of the Invention]

[0013] With the present invention, even if the size of the mounting portion in the wall thickness direction provided at the tensioned end of the diagonal member is reduced, the strength of the mounting portion is suppressed, and the locking member effectively prevents rotation of the mounting portion about the center line of the diagonal member. [Brief explanation of the drawing]

[0014] [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]It is a perspective view of the mounting part shown enlarged in FIG. 2 as seen from another direction. [Figure 4] It is a diagram showing the welding part etc. of the mounting part for tensioning the flat bar of the shear wall shown in FIG. 1. FIG. 3(A) is a cross-sectional view by a plane parallel to the main surface of the flat bar, FIG. 3(B) is a side view, and FIG. 3(C) is a cross-sectional view taken along the arrow A-A of FIG. 3(A). [Figure 5] It shows the connection of the lower connection member of the mounting part for tensioning the shear wall of the embodiment. FIG. 6(A) is an explanatory diagram showing the above mounting part separated from the above lower connection member, and FIG. 6(B) is an explanatory diagram showing the connection state. [Figure 6] FIGS. 9(A) and 9(B) are explanatory diagrams showing the influence of the mounting part for tensioning during an earthquake depending on the length of the non-fixed region where the locking member in the flange plate is not fixed in the shear wall of the embodiment. [Figure 7] It is a schematic perspective view showing a mode in which the upper connection member to which the mounting part that is not for tensioning is connected holds the head of the bolt with head by two gasket plates in the shear wall of the embodiment. [Figure 8] It is an explanatory diagram showing the working process of connecting the mounting part that is not for tensioning to the upper connection member shown in FIG. 7.

Mode for Carrying Out the Invention

[0015] Hereinafter, an embodiment according to an aspect of this invention will be described based on the accompanying drawings. As shown in Fig. 1, the shear wall 1 of this embodiment includes diagonal members 2 made of flat bars in a cross shape. Plate-shaped mounting portions 21 located on the upper end sides of the respective diagonal members 2 are connected to an upper connecting member 3 located on the upper side of a column 100 (for example, a 60 mm square steel pipe column) which is a building frame. Similarly, tension mounting portions 22 located on the lower end sides of the respective diagonal members 2 are 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 member 2 made of a flat bar with the main surface side (front surface side) positioned parallel to the wall surface within the wall surface are connected to the connecting members 3 and 4 on the building frame side. Further, the shear wall 1 includes a crosspiece, plywood, a gypsum board, etc. on the outer surface side of such an internal structure.

[0016] For example, through holes are 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 through holes are also formed in the upper connecting member 3 in a direction orthogonal to the wall surface of the shear wall 1. A bolt of a bolt and nut 7 is inserted into the through hole, and the nut is tightened on the bolt, whereby the mounting portion 21 is fixed to the upper connecting member 3. Note that the nut of the bolt and nut 7 may be fixed to the upper connecting member 3 by welding or the like.

[0017] On the other hand, as also shown in Figs. 2 and 3, the tension mounting portion 22 on the lower side includes two flange plates 22a (for example, width 50 mm, plate thickness 3.2 mm) having one end side fixed by welding to each edge side (narrow side surface) of the diagonal member 2, and an end plate 22b fixed to the other end sides of these flange plates 22a. The end plate 22b has a substantially square shape, and the other ends of the respective flange plates 22a are welded to the side surfaces arranged opposite thereto. Further, the end plate 22b is separated from the end face (end) of the diagonal member 2, and a screw portion (male screw portion) of a headed bolt 5 described later is positioned at this separated portion. An insertion hole 22c is formed in the center side of the end plate 22b in the center line direction of the diagonal member 2.

[0018] 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 are fixed to the mounting plate portion 41 by welding or the like, spaced apart in the wall thickness direction of the load-bearing wall 1. The spacing between the two gusset plates 42 is slightly wider than the parallel surface width of the hexagonal head of the headed bolt 5, preventing the inserted headed bolt 5 from rotating.

[0019] 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, an insertion hole 43a is formed in the connecting plate 43 in the direction of the centerline of the diagonal member 2, and the threaded portion of a headed bolt 5 protrudes upward from this insertion hole 43a, and a clamping nut 61 is screwed onto the threaded portion of the headed bolt 5 on the upper surface of the connecting plate 43. The end plate 22b and the connecting plate 43 are separated by, for example, about 30 mm in the direction of the centerline of the diagonal member 2, according to the design.

[0020] The threaded portion of the headed bolt 5 is inserted through the insertion hole 22c of the end plate 22b, and the threaded portion of the headed 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 headed 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 headed bolt 5 that protrudes at the aforementioned gap.

[0021] Furthermore, as shown in Figures 4(A), 4(B), and 4(C), 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. The base of the locking member 221 is welded to a side of the end plate 22b that is different from the side of the end plate 22b that is arranged in the opposite direction, and to the lower side of the edge (one side) of the flange plate 22a, in an arrangement perpendicular to the flange plate 22a. The tip of the locking member 221 overlaps the side of the connecting plate 43 by about 10 mm and is located in close proximity to that side. The welding points between the locking member 221, the flange plate 22a, and the end plate 22b are fillet welds (intersections of surfaces) at the points of contact with each other (see the blacked-out areas in the figures). It is desirable to weld all of these contact points, but it is not necessarily required to weld all of them. Furthermore, in this example, the length L1 of the welded joint between the locking member 221 and the flange plate 22a is approximately 30 mm.

[0022] As shown in Figures 5(A) and 5(B), when the nut 63, which is screwed onto the threaded portion of the headed 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 headed 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.

[0023] 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.

[0024] In Figure 5(A), for convenience and to make it easier to show the positional relationship of the members, the mounting portion 22 is shown to be far apart from the lower connecting member 4. In the 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. In this connected state, the mounting portion 22 on one side is positioned away from the connecting plate 43, and in this separated state, the threaded portion of the headed bolt 5 provided on the connecting plate 43 side is passed through the insertion hole 22c and protrudes upward, and the nut 63 can be screwed onto this protruding threaded portion. The side of the end plate 22b where the locking member 221 is not joined is open, so a tool can be inserted from this open side and the nut 63 can be screwed on.

[0025] With the above configuration, the locking member 221 is welded to a side of the end plate 22b that is different from the side of the reversed arrangement described above, and to a part of one edge of the flange plate 22a, so that the flange plate 22a and the locking member 221 are fixed to the end plate 22b in a U-shape. For this reason, even if the size of the flange plate 22a and the end plate 22b provided at the tensioned end of the diagonal member 2 is reduced in the wall thickness direction in order to reduce the wall thickness of the load-bearing wall 1, and the welding length (see L2 in Figure 4(C)) is shortened, it is possible to prevent a decrease in the strength of the mounting portion 22.

[0026] Furthermore, since the wider side of the locking member 221 is parallel to the wall surface, there are no size constraints on that wider side, and it can make broad contact with the side surface of the connecting plate 43, effectively preventing rotation of the diagonal member 2 around the center line of the mounting portion 22. This rotation prevention effectively prevents twisting of the diagonal member 2 when it is tensioned by tightening the nut 63.

[0027] Furthermore, the spacing between the two gusset plates 42 is slightly wider than the width of the parallel surfaces of the hexagonal heads of the headed bolts 5, preventing the installed headed bolts 5 from rotating. This eliminates the need to hold the heads of the headed bolts 5 with a tool to prevent them from rotating, improving workability. In addition, because the two gusset plates 42 are positioned close together, it contributes to making the load-bearing wall 1 thinner, and the width of the connecting plate 43 can also be narrowed to make it less prone to bending, making it possible to reduce the thickness of the connecting plate 43 (for example, from 16 mm to about 12 mm).

[0028] Here, as shown in Figure 6(A), if the length L1 of the welded joint between the locking member 221 and the flange plate 22a significantly exceeds 30 mm, when the shear wall 1 deforms into a parallelogram shape due to inter-story deformation caused by an earthquake, the strong tensile force from the diagonal member 2 is transmitted strongly to the threaded portion of the headed bolt 5 via the mounting portion 22, due to the flange plate 22a and the locking member 221 being firmly fixed to the end plate 22b in a U-shape as described above, and there is a risk that this threaded portion will bend and break.

[0029] If the length L1 of the welded joint between the locking member 221 and the flange plate 22a is approximately 30 mm, then, as shown in Figure 6(B), the unwelded area of ​​the flange plate 22a deforms in the in-plane direction of the shear wall 1 before the threaded portion of the headed bolt 5, thus preventing bending fracture of the threaded portion due to an earthquake. Note that the above 30 mm is a value for example when the column size is 60 mm square, and will be a different value if the column size etc. is different. In other words, the unfixed area of ​​the flange plate 22a where the locking member 221 is not fixed is designed to be a length that deforms in the in-plane direction of the wall surface of the shear wall 1 before the threaded portion of the headed bolt 5 due to the load applied to the diagonal member 2 by the inter-story deformation during the assumed earthquake, taking into consideration the steel material used in the shear wall 1.

[0030] Furthermore, in the above example, the upper mounting portion 21 of the diagonal member 2 was fixed to the upper connecting member 3 by bolts and nuts 7, but this is not limited to this. As shown in Figures 7 and 8, the upper mounting portion 21A of the diagonal member 2 may be fixed to the upper connecting member 3A by headed bolts 5A and nuts 5B.

[0031] In other words, the mounting portion 21A is attached to the upper side of the load-bearing wall 1, and this other mounting portion 21A is also positioned spaced apart from the other end face of the diagonal member 2 and has a substantially rectangular other end plate 21b having an insertion hole 22c in the direction of the centerline of the diagonal member 2, and the reversed side surfaces of the end plate 21b are fixed to the other two flange plates 21a, 21a which are fixed to each edge side of the diagonal member 2.

[0032] The upper connecting member 3A connected to the mounting portion 21A has two gusset plates 32, 32 spaced apart in the wall thickness direction of the load-bearing wall 1, and the spacing between the gusset plates 32, 32 is wider than the width of the head of the headed bolt 5A and is such that the head does not rotate. A connecting plate 33 is fixed to the upper ends of the two gusset plates 32, 32, opposite the end plate 21b. The end plate 21b protrudes from the two gusset plates 32, 32 and is welded to the two gusset plates 42 on the outside of this protrusion. In addition, a connecting portion side insertion hole 33a is formed in the connecting portion side insertion hole 33a in the direction of the center line of the diagonal member 2, and the threaded portion of the headed bolt 5A protrudes downward from this connecting portion side insertion hole 33a.

[0033] The end plate 21b is tightly fixed (non-tensioned) to the upper connecting member 3A by screwing a nut 5B onto the threaded portion of the headed bolt 5A on the underside of the end plate 21b. The upper connecting member 3A may also be provided with a locking member 211 equivalent to the locking member 221.

[0034] 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]

[0035] 1: Load-bearing wall 2: Diagonal material 3: Upper connecting member 3A: Upper connecting member 4: Lower connecting member 5: Headed bolts 5A: Headed bolt 5B: Nut 7: Bolts and nuts 21: Mounting part 21A: Mounting part 21a: Flange plate 21b: End plate 22: Mounting part 22a: Flange plate 22b: End plate 22c: Through hole 32: Gusset Plate 33: Connecting plate 33a: Through hole on the connector side 41: Mounting plate section 42: Gusset Plate 43: Connecting plate 43a: Through hole 61: Nut 62: Nut 63: Nut 100: Pillar 211: Locking member 221: Locking member

Claims

1. A load-bearing wall in which mounting portions provided at both ends of a diagonal member, which is a flat bar positioned parallel to the wall surface within the wall surface, are connected to a connecting member on the building's structural side, The mounting portion on one side of the above-mentioned diagonal member is positioned spaced apart from the end face of the diagonal member and comprises a substantially rectangular end plate having an insertion hole in the direction of the centerline of the diagonal member, and the other ends of two flange plates, one end of which is fixed to each edge of the end of the diagonal member, are fixed to the opposite sides of the end plate. The mounting portion on one side and the connecting member are spaced apart in the direction of the centerline. The mounting portion on one side and the connecting member are provided on either side and the male threaded portion is passed through the insertion hole, and the female threaded portion on the other side is screwed together. The movement of either the male screw portion or the female screw portion due to the screwing motion causes the mounting portion on one side to be pulled toward the connecting member. A load-bearing wall characterized in that the tip of a locking member, whose base end is fixed to a side of the end plate that is different from the side of the end plate that is arranged in the opposite direction, and to a part of the edge of one side of the flange plate, is locked to the connecting member, thereby preventing rotation of the diagonal member about the center line of the mounting portion on one side.

2. A shear wall according to claim 1, characterized in that the unfixed region in the flange plate where the locking member is not fixed has a length that deforms in the in-plane direction of the wall surface before the male screw portion due to the load applied to the diagonal member by inter-story deformation during an earthquake.

3. A load-bearing wall according to claim 1, wherein the connecting member to which the mounting portion on one side is connected is equipped with a headed bolt as the male threaded portion, the threaded portion of the headed bolt is inserted through the insertion hole, and a nut as the female threaded portion is screwed onto the inserted threaded portion.

4. The load-bearing wall according to claim 3, wherein the connecting member has two gusset plates spaced apart in the wall thickness direction of the load-bearing wall, and the spacing between the gusset plates is wider than the width of the head of the headed bolt and is such that the head does not rotate.

5. In the load-bearing wall according to claim 1, the mounting portion on the other side, located opposite to the one side, is attached to the upper side of the load-bearing wall, and this mounting portion on the other side is also spaced apart from the other end face of the diagonal member, and comprises a substantially rectangular end plate on the other side having an insertion hole in the direction of the centerline of the diagonal member, and the other ends of two flange plates, each with one end fixed to each edge of the end of the diagonal member, are fixed to the opposite sides of the other end plate, respectively. The connecting member on the other side, which is connected to the mounting portion on the other side, has a connecting portion-side insertion hole in the direction of the centerline of the diagonal member and has two gusset plates spaced apart in the wall thickness direction of the load-bearing wall, and the spacing between the gusset plates is wider than the width of the head of the headed bolt and is such that the head does not rotate. A load-bearing wall characterized in that the threaded portion of the headed bolt is inserted from above into the insertion hole on the connection side of the other connecting member, and a nut is screwed onto the threaded portion on the lower side of the other end plate, thereby tightly fixing the other end plate to the other connecting member.

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