JP2008231889A - Reinforcement structure of bearing wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the reinforcement structure of a bearing wall which easily improves the strength of the bearing wall and simply inexpensively realizes the improvement of the strength of the bearing wall. <P>SOLUTION: In the reinforcement structure of the bearing wall, a square wall frame 7 is formed by laterally placing a beam 5 at the upper ends of a pair of separated pillars 3a, 3b whose base ends fixed to a foundation 1, and respective side parts of a square planar material 9 are fixed to the foundation 1 of the wall frame 7, the pair of the pillars 3a, 3b, and the beam 5 with a plurality of nails 11. Reinforcement plates 27 are formed by forming a plurality of fixing holes in the longitudinal direction of a metal band plate. A pair of the reinforcement plates 27, 27 are overlapped to at least a part of nail head parts in a part of the longitudinal direction of parallel two side parts 9A, 9A of the planar material 9 and are fixed with wood screws 31 which are inserted into the fixing holes and pass through the planar material 9 and reach the pillars 3a, 3b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcement structure of a load bearing wall in which each side portion of a square face material is fixed to a wall frame including a base, a pair of columns, and a beam with a nail.

  Buildings need to be further improved in seismic performance against major earthquakes that will occur in the future. It is desirable that the wooden building has a structure that can disperse and absorb the external force in the entire frame, and each load-bearing element constituting the frame is required to have a predetermined strength. In a wooden building, one of the load-bearing elements that resists horizontal forces caused by earthquakes and winds is a load-bearing wall. The load bearing wall generally has a structure in which a brace is inserted and a shaft is fixed with a truss structure. For example, a quadrangular wall frame is formed by horizontally laying a beam on the upper ends of a pair of spaced apart columns whose base ends are fixed on a base, and braces are inserted in the diagonal direction of the wall frame. The upper and lower ends are preferably fixed with hardware so that the brace does not fall off even if tension or compression is applied.

  On the other hand, some load bearing walls are configured to nail a structural surface material such as a plywood on one side or both sides of the shaft assembly and to resist external force by the shearing force. For example, as shown in FIG. 6, this type of load-bearing wall has a rectangular wall frame 7 with a beam 5 horizontally mounted on the upper ends of a pair of spaced pillars 3 a and 3 b with base ends fixed on the base 1. Each side part of the square face material 9 is fixed to the base 1 of the wall frame 7, the pair of columns 3 a and 3 b, and the beam 5 with a plurality of nails 11. The load bearing wall using the face material 9 is simple because construction can be performed only by nailing, and since a large wall magnification can be obtained, it becomes a useful load bearing element particularly in a wooden house or the like. In addition, only a brace or a brace and a face material may be attached to the bearing wall.

  However, the load bearing wall using the face material 9 is a nail head that comes into contact with the surface 9a of the face material 9 as shown in FIG. 7 when a tensile force acts between the wall frame 7 and the face material 9 due to an external force. 11a penetrates through the perforations 13 and the face material 9 is detached from the wall frame 7 and the yield strength is drastically reduced. On the other hand, if the nail 11 is increased along the outer peripheral edge of the face material 9, the load per nail is reduced, so that the perforation 13 is less likely to occur. When performing construction, it is necessary to peel off most of the exterior material that covers the face material 9, and construction costs other than reinforcement of the main purpose bearing wall (in addition to the interior walls, construction of the ceiling and floor parts) There was a problem that the cost was high. For this reason, there has been a demand for a structure that can reinforce existing bearing walls with simple and inexpensive construction.

  The present invention has been made in view of the above situation, and provides a reinforcement structure of a load bearing wall that can easily increase the strength of the load bearing wall, and aims to improve the strength of the load bearing wall easily and inexpensively. To do.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
In the reinforcing structure of a load bearing wall according to claim 1 of the present invention, a rectangular wall frame 7 is formed by horizontally extending a beam 5 on the upper ends of a pair of spaced pillars 3a and 3b having base ends fixed on a base 1. In this structure, the side walls of the square face material 9 are fixed to the base 1 of the wall frame 7, the pair of pillars 3 a and 3 b, and the beam 5 by a plurality of nails 11. And
A plurality of fixing holes 29 are formed in the longitudinal direction of the metal strip to form the reinforcing plate 27;
A pair of the reinforcing plates 27 is overlapped with at least a part of the nail head portion 11a on a part of the parallel two side portions 9A of the face member 9 and is inserted into the fixing hole 29 and penetrates the face member 9. It is fixed by a linear fixing member 31 that reaches the wall frame 7.

  In this reinforcing structure of the load bearing wall, only by attaching a small reinforcing plate 27 at a predetermined position of the face material 9, for example, a part of the parallel two side portions 9A in the longitudinal direction, that is, shorter than the length of the side portion, Lifting of the nail head 11a is prevented. As a result, even if an external force acts on the load bearing wall 21, it becomes difficult for the strength to decrease due to the nail head 11 a rising, and the strength of the load bearing wall 21 is equivalent to that of adding one set of the face material 9 and bracing. Increased to about 130-200%.

  The reinforcing structure of the load-bearing wall according to claim 2 is characterized in that the reinforcing plate 27 is disposed at a substantially central portion of the side portion 9A.

  In this reinforcing structure of the bearing wall, the length of the nail row in which the head is not pressed by the reinforcing plate 27 is 2 as compared with the case where the reinforcing plate 27 is fixed to the end of the side portion 9A in the longitudinal direction. Divided and shortened. That is, the length of the low-strength portion that cannot be pressed by the nail head portion 11a is shortened and dispersed, and a weakened portion whose strength is extremely lowered as compared with other portions is not formed.

  The reinforcing structure of the bearing wall according to claim 3 is characterized in that the reinforcing plate 27 is fixed to two parallel side portions 9A of the face material 9 corresponding to the pair of pillars 3a and 3b.

  In this load-bearing wall reinforcing structure, the parallel two-side portions 9A and 9A of the face material on the long side corresponding to the pair of columns 3a and 3b are reinforced to the load-bearing wall 21 that is generally rectangular in the vertical direction. The plate 27 is fixed. Thereby, compared with the case where the reinforcement plate 27 is fixed to the short side 9b side, the load-bearing wall 21 can be efficiently reinforced (strength improvement).

  The reinforcing structure of the bearing wall according to claim 4 is characterized in that the reinforcing plate 27 is disposed on the opposite side of the face material end portion 9a with the nail 11 interposed therebetween.

  In this load-bearing wall reinforcing structure, the reinforcing plate 27 can be attached without using a margin for attaching the face material end portion 9a and the column 3 and securing a mounting margin separately. For example, when the reinforcing plate 27 is disposed on the side of the face material end 9a with the nail 11 in between, an edge for arranging the reinforcing plate 27 is secured between the nail 11 hitting portion and the face material end 9a. Will have to do. On the other hand, this configuration can cover the nail head portion 11a with the reinforcing plate 27 even when the reinforcing plate arrangement space is not secured at the edge of the face material.

The reinforcing structure of the load-bearing wall according to claim 5, wherein one end portions of the two orthogonal metal strips are connected to each other to form an L-shaped reinforcing plate,
The L-shaped reinforcing plate is arranged so as to overlap at least a part of the nail head portion 11a and is disposed at the corner of the face member 9.

  In this load-bearing wall reinforcement structure, one metal strip of the L-shaped reinforcement plate is fixed to the beam 5 and the other metal strip is fixed to the columns 3a and 3b, thereby preventing the nail head 11a from coming off. In addition to improving the strength of the load bearing wall 21, the face member 9, the beam 5, and the columns 3a and 3b are integrally fixed by the L-shaped reinforcing plate.

  According to the reinforcement structure of a load bearing wall according to claim 1 of the present invention, a rectangular face member is fixed to a square wall frame with a plurality of nails, and the pair of reinforcing plates are connected to two parallel sides of the face member. Since it was fixed with a linear fixing member that overlapped at least a part of the head of the nail, passed through the fixing hole and passed through the face material to reach the wall frame, only a small plate was attached to the predetermined position of the face material Thus, the strength of the bearing wall can be increased to the same level as that obtained by adding one set of face materials and braces (an increase of 130 to 200%). That is, there is little range in which the plate is attached, and the repair work for exposing the construction part can be saved. As a result, high strength reinforcement can be applied to the existing bearing wall by simple and inexpensive construction.

  According to the reinforcing structure of the bearing wall according to claim 2, since the reinforcing plate is disposed at the substantially central portion of the side portion, the reinforcing plate having the same length is shifted to the end portion side in the longitudinal direction of the side portion. The length of the nail row in which the head is not pressed by the reinforcing plate is divided into two and shorter than the case where the reinforcing plate is fixed. Thereby, the fall of the intensity | strength by the nail row where the head is not pressed down becoming long can be prevented. Further, the reinforcement work can be performed by opening the exterior only at the position of the substantially central part with respect to the longitudinal direction of the side part, and the reinforcement work for the existing wooden building can be performed without making it large.

  According to the reinforcing structure of the bearing wall according to claim 3, since the reinforcing plate is fixed to the two parallel sides of the face material corresponding to the pair of pillars, the bearing wall generally has a rectangular shape that is long in the vertical direction. Thus, the reinforcing plate can be fixed to the two parallel sides of the face material on the long side corresponding to the pair of columns. This makes it possible to efficiently reinforce the load-bearing wall (increase the strength) compared to the case where the reinforcing plate is fixed to the short side, and to repair the ceiling material and flooring when installing the reinforcing plate on the short side. Elimination can be done easily.

  According to the reinforcement structure of the load bearing wall according to claim 4, since the reinforcing plate is disposed on the opposite side of the end of the face member with the nail interposed therebetween, the overlap between the end of the face member and the column is used for attachment. Reinforcing plates can be attached without securing a separate allowance.

  According to the reinforcement structure of the bearing wall according to claim 5, the L-shaped reinforcement plate is formed by connecting one end portions of two orthogonal metal strips to each other, and the L-shaped reinforcement plate is attached to at least the nail head. Since it overlaps with a part and is arranged at the corner of the face material, one metal strip of the L-shaped reinforcing plate is fixed to the beam, and the other metal strip is fixed to the column, so that the nail head can be removed. In addition to improving the strength of the load-bearing wall by blocking, the strength of the load-bearing wall can be further improved by integrally fixing the face members, beams, and columns with the L-shaped reinforcing plate.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a reinforcement structure for a load bearing wall according to the invention will be described in detail with reference to the drawings.
1 is a perspective view of a load bearing wall having a reinforcing structure according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a horizontal sectional view of a reinforcing plate fixing portion shown in FIG. In addition, the same code | symbol is attached | subjected to the member or site | part same as the member or site | part shown to FIG. 6, FIG. 7, and the overlapping description is abbreviate | omitted.
The reinforcement structure of the load-bearing wall according to the present embodiment forms a rectangular wall frame 7 by horizontally spanning the beam 5 at the upper ends of a pair of spaced pillars 3a and 3b having base ends fixed on the base 1. It is suitably used for a load bearing wall 21 in which each side of a square face material 9 is fixed to a base 1 of a wall frame 7, a pair of columns 3 a and 3 b, and a beam 5 with a plurality of nails 11.

  A stud 23 shown in FIG. 2 is provided between the pillars 3 a and 3 b, and the stud 23 has a lower end fixed to the base 1 and an upper end fixed to the beam 5. Heat insulating materials 25 and 25 are inserted between the pillars 3a and the inter-columns 23 and between the inter-columns 23 and the pillars 3b, and the heat insulating materials 25 and 25 are concealed by attaching the face material 9.

  In the reinforcing structure of the bearing wall, a pair of reinforcing plates 27 and 27 are fixed to the surface of the face member 9. The reinforcing plates 27, 27 are formed by drilling a plurality of fixing holes 29 in the longitudinal direction of the metal strip. The pair of reinforcing plates 27 and 27 are fixed to a part of the parallel two sides 9A and 9A of the face member 9 in the longitudinal direction. At that time, as shown in FIG. 3, the reinforcing plates 27, 27 are overlapped with at least a part of the nail head portion 11 a, the edge portion 27 a is passed through the fixing hole 29, penetrates the face material 9, and the wall frame 7 is In the present embodiment, a linear fixing member, such as a wood screw, a screw, a nail, a special nail, or the like that reaches the pillars 3a and 3b to be formed, is fixed using the wood screw 31. That is, the head 31 a of the wood screw 31 has a larger outer diameter than the inner diameter of the fixing hole 29.

  It is preferable that the reinforcing plates 27 and 27 are disposed at a substantially central portion of the side portion 9A. Thus, the nail head portion 11a is pressed by the reinforcing plates 27 and 27 rather than the case where the reinforcing plates 27 and 27 are fixed to the end side (upper end side or lower end side) in the longitudinal direction of the side portion 9A. The length of the nail row is shortened by being divided into two. That is, the length of the low-strength portion that cannot be pressed by the nail head portion 11a is shortened and dispersed, and a weakened portion whose strength is extremely lowered as compared with other portions is not formed. As a result, a decrease in strength due to an increase in the length of the nail row where the nail head portion 11a is not pressed is prevented.

  Moreover, it is preferable that the reinforcement plates 27 and 27 are fixed to two parallel sides 9A and 9A of the face material 9 corresponding to the pair of pillars 3a and 3b as shown in FIG. Reinforcing plates 27 and 27 are fixed to the parallel two side portions 9A and 9A of the face material 9 on the long side corresponding to the pair of pillars 3a and 3b with respect to the load bearing wall 21 that is generally rectangular in the vertical direction. Will be. Thereby, compared with the case where the reinforcement plates 27 and 27 are fixed to the short sides 9B and 9B side, the load-bearing wall 21 can be efficiently reinforced (strengthened). Further, it is possible to simplify the construction by eliminating the modification of the ceiling material and the floor material when the reinforcing plates 27, 27 are attached to the short sides 9B, 9B.

  Furthermore, as shown in FIG. 3, the reinforcing plate 27 is preferably disposed on the opposite side of the face material end portion 9a with the nail 11 interposed therebetween. Thereby, the reinforcing plate 27 can be attached without using a margin for attaching the face material end portion 9a and the pillar 3a (or the pillar 3b) without securing a separate attachment margin. For example, when the reinforcing plate 27 is disposed on the side of the face material end 9a with the nail 11 in between, an edge for arranging the reinforcing plate 27 is secured between the nail 11 hitting portion and the face material end 9a. Will have to do. On the other hand, this configuration can cover the nail head portion 11a with the reinforcing plate 27 even when the reinforcing plate arrangement space is not secured at the edge of the face material. As a result, the reinforcing plate 27 can be attached without securing a separate attachment allowance.

  Thus, in the reinforcement structure of the load bearing wall configured as described above, the reinforcement is shorter than the length of the side portion 9A at a predetermined position of the face member 9, for example, at a part in the longitudinal direction of the two parallel side portions 9A and 9A. By simply attaching the plates 27, 27, the reinforcing plates 27, 27 prevent the nail head 11a from being lifted. As a result, even if an external force acts on the load bearing wall 21, it becomes difficult for the strength to decrease due to the nail head 11 a rising, and the strength of the load bearing wall 21 is equivalent to that of adding one set of the face material 9 and bracing. Increased to about 130-200%.

  Needless to say, the fixing strength of the face material 9 is further improved by fixing the wood screws 31 inserted into the reinforcing plates 27 and 27 to the pillars 3a and 3b in addition to the nails 11. In this configuration, the reinforcing plates 27 and 27 at that time are in contact with the nail head portion 11a, so that the nail removal is prevented and the proof strength when an external force is applied is further enhanced. In the case where the reinforcing plates 27 and 27 are not in contact with the nail head portion 11a, when a pulling force is applied to the columns 3a and 3b and the face material 9 by an external force, the nail head portion 11a is lifted and fixed by the nail 11. The power gradually decreases. Further, the face material 9 is fixed to the pillars 3a and 3b with the wood screws 31 via the reinforcing plates 27 and 27, so that the fixing strength is increased. As a result, the through-hole 13 (see FIG. 7) by the nail head portion 11a is also prevented.

  In addition, since the reinforcement structure of this bearing wall is for obtaining an effect to a small extent to the last, it is not necessary to fasten the reinforcement plate 27 over the full length of the side part 9A (it can be obtained even if fastened to the full length). This is because the renovation work increases for the effect and becomes uneconomical).

  Therefore, according to the reinforcing structure of the load bearing wall, the square face material 9 is fixed to the square wall frame 7 with the plurality of nails 11, and the pair of reinforcement plates 27 and 27 are parallel to the face material 9. Since the two side portions 9A and 9A are overlapped with at least a part of the nail head portion 11a, and are fixed by the wood screws 31 that pass through the fixing hole 29, penetrate the face material 9 and reach the pillars 3a and 3b, the surface material 9 By simply attaching a small plate to the predetermined position, the strength of the load bearing wall 21 can be increased to the same level (130 to 200% increase) as the one set of the face material 9 and the brace. That is, there is little range in which the plate is attached, and the repair work for exposing the construction part can be saved. As a result, high strength reinforcement can be applied to the existing bearing wall 21 by simple and inexpensive construction.

Next, a description will be given of an embodiment in which a horizontal load is applied to a load bearing wall manufactured in the same configuration as that described above and a conventional load bearing wall and the displacement is compared.
FIG. 4 is a front view of a load generator with a load bearing wall attached, and FIG. 5 is a graph comparing the correlation between the load and displacement in the load bearing wall with and without a reinforcing plate. In addition, the same code | symbol shall be attached | subjected to the member or site | part equivalent to the member or site | part shown in FIGS.
As shown in FIG. 4, the load bearing wall 21 of the embodiment forms a rectangular wall frame 7 by horizontally extending a beam 5 on the upper ends of a pair of spaced pillars 3 a and 3 b with base ends fixed on the base 1. Then, each side portion of the square face material 9 was fixed to the base 1 of the wall frame 7, the pair of pillars 3 a and 3 b, and the beam 5 with a plurality of nails 11. In addition, a pair of reinforcing plates 27 and 27 were fixed to a part of the two parallel sides 9A and 9A in the longitudinal direction (substantially central portion) of the face material 9 so as to overlap substantially half of the nail head portion 11a.

  The base 1 was fixed with a plate nut 45 threaded into an upper end of an anchor bolt 43 erected on an apparatus base 41 serving as a base. In addition, the pair of pillars 3a and 3b fixed the lower platen bolts 47 and 47 and fixed their tips to the device base 41 to prevent the base 1 from coming off. Further, the wing plate bolts 47 and 47 are also fixed to the upper portions of the pair of pillars 3a and 3b, and the plate nut 45 is screwed to the tip through which the beam 5 is penetrated to prevent the beam 5 from coming off. A horizontal load generator 53 is connected to one end of the beam 5 (the left column in FIG. 4) via a connection fitting 51. As a result, a horizontal load is applied in the direction of the arrow X to the beam 5 of the load bearing wall 21 in which the base 1 is fixed to the apparatus base 41.

<Material and dimensions of components used>
[Beam] Tree species
Grade Symmetrically different graded glulam (E120-F330)
Cross-sectional dimension 105 × 180mm
[Pillar] Tree species
Grade Same grade composition laminated lumber (E95-F315)
Cross-sectional dimension 105 × 105mm
[Base] Tree species Karamatsu
Grade Same grade composition laminated lumber (E105-F300)
Cross-sectional dimension 105 × 105mm
[Space pillar] Tree species SPF assembly
Grade None
Cross-sectional dimension 27 x 105mm
[Face material] Type MDF JIS A 5905
Bending strength 30 types
Dimensions Thickness 9mm 910x2730mm
[Reinforcement plate] Material Hot-dip galvanized steel sheet SGHC
Thickness 1.2mm JIS G 3302
Plating Hot-dip zinc
Adhesion amount Unalloyed Z27 234-275 g / m ²
Dimensions 25x900mm
[Nail (interspace)] N50 JIS A 5508
Fastening pitch 200mm
Length 50mm
Body diameter 2.75mm
Head diameter 6.60mm
[Nail (pillar, etc.)] N65 JIS A 5508
Fastening pitch 75mm
Length 65mm
Body diameter 3.05mm
Head diameter 7.30mm
[Wood screw] CPQ55
Fastening pitch 150mm
Length 55mm
Body diameter 5.4mm
Head diameter 8.4mm
[Surface material and column overlap] 52.5mm
[Nail position] 25 mm from edge of face material
[Wood screw position] 40mm from edge of face material

  As a result of applying a horizontal load to the beam 5 of the load bearing wall 21 by the horizontal load generator 53 and examining the correlation with the displacement, as shown in FIG. 5, the load bearing wall to which the reinforcing plate is fixed has no reinforcing plate. It was found that, for example, the load increased by about 150% at a displacement of 100 mm, and the strength increased at other displacement values as compared to the bearing wall.

  In the above embodiment, the case where the reinforcing plate 27 has a linear shape has been described as an example. However, in the reinforcing structure of a load bearing wall according to the present invention, one end portions of two orthogonal metal strips are connected to each other. Thus, an L-shaped reinforcing plate may be formed, and the L-shaped reinforcing plate may be placed on at least a part of the nail head portion 11a and disposed at the corner of the face material 9. In such a configuration using the L-shaped reinforcing plate, one metal strip of the L-shaped reinforcing plate is fixed to the beam 5 and the other metal strip is fixed to the column 3a (or 3b), so that the nail In addition to improving the strength of the load bearing wall 21 by preventing the head 11a from coming off, the face member 9, the beam 5, and the columns 3a and 3b are integrally fixed by the L-shaped reinforcing plate. Thereby, the strength of the bearing wall 21 can be further improved.

It is a perspective view of a load bearing wall having a reinforcing structure according to the present invention. FIG. 2 is an exploded perspective view of FIG. 1. FIG. 2 is a horizontal sectional view of a reinforcing plate fixing portion shown in FIG. 1. It is a front view of the load generator which attached the bearing wall. It is the graph which compared the correlation with the load and displacement in a bearing wall by the presence or absence of a reinforcement plate. It is a perspective view of the load-bearing wall which fixed the conventional face material. It is a principal part perspective view of the conventional load-bearing wall from which the nail head fell out from perforation of the face material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base 3a, 3b ... A pair of pillar 5 ... Beam 7 ... Wall frame 9 ... Face material 9A ... Two parallel sides of face material according to pillar 9a ... Face material edge part 11 ... Nail 11a ... Nail head 21 ... Bearing wall 27 ... Reinforcement plate 29 ... Fixing hole 31 ... Linear fixing member (wood screw)

Claims (5)

A quadrangular wall frame is formed by horizontally extending a beam on the upper ends of a pair of spaced apart pillars each having a base end fixed on a base, and the base of the wall frame, the pair of columns, and the beam A reinforcement structure of a load bearing wall in which each side of the face material is fixed with a plurality of nails,
Drilling a plurality of fixing holes in the longitudinal direction of the metal strip to form a reinforcing plate,
A pair of the reinforcing plates are overlapped with at least a part of the nail head part in a longitudinal direction of two parallel sides of the face material, and are inserted through the fixing hole so as to penetrate the face material and reach the wall frame. A structure for reinforcing a bearing wall, which is fixed by a linear fixing member.   The reinforcement structure of a load bearing wall according to claim 1, wherein the reinforcing plate is disposed at a substantially central portion of the side portion.   The reinforcing structure of the bearing wall according to claim 1 or 2, wherein the reinforcing plate is fixed to two parallel sides of the face material corresponding to the pair of columns.   The reinforcing structure of a load bearing wall according to claim 1, 2 or 3, wherein the reinforcing plate is disposed on the opposite side of the end of the face material with the nail interposed therebetween. The L-shaped reinforcing plate is formed by connecting one end portions of the two metal strips orthogonal to each other,
The load bearing wall according to any one of claims 1, 2, 3, and 4, wherein the L-shaped reinforcing plate is arranged on at least a part of a nail head portion and disposed at a corner of the face member. Reinforcement structure.

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