Reinforcement structure for wooden buildings

Abstract

To provide a reinforcing structure for a wooden building, the components of which are lightweight and easy to work with. [Solution] The reinforcing structure of a wooden building 1 comprises a first anchor bolt 10 inserted horizontally into a concrete foundation 2 of the wooden building and fixed with a resin adhesive, a second anchor bolt 30 inserted horizontally into the wood of the wooden building and fixed with a resin adhesive, a first fixing member 20 fixed to the first anchor bolt, a second fixing member 40 fixed to the second anchor bolt, and a stainless steel wire 50 arranged between the first fixing member and the second fixing member.

Description

[Technical field]

[0001] This invention relates to a reinforcement structure for wooden buildings, and in particular to a reinforcement structure for improving the earthquake resistance strength of buildings constructed using wooden framework construction or wooden frame wall construction. [Background technology]

[0002] Earthquakes and other events can cause heavy loads on wooden buildings, resulting in damage or collapse. In the 2016 Kumamoto earthquake, many wooden buildings collapsed in areas that suffered heavy damage, even those that met the new 1981 earthquake resistance standards. In many of the collapsed buildings, the joints of columns, girders, beams, foundations, and other structures were separated or destroyed. To improve earthquake resistance, reinforcement structures are needed to firmly secure the joints. Although there are traditional reinforcement structures such as turnbuckles that can withstand forces in the girder direction, reinforcement structures against forces in the beam direction are rare.

[0003] In consideration of the above circumstances, the inventor of the present application developed the reinforcement structure of Patent Document 1 as a reinforcement structure for wooden buildings. In the above reinforcement structure, the wood near the second floor and the concrete foundation are fixed via reinforcing members. This improves the strength against the force applied in the direction of pulling the wood and the foundation apart. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 10,883,263 Summary of the Invention [Problem to be solved by the invention]

[0005] The structure disclosed in Patent Document 1 employs a structure in which reinforcing bars are used to connect the foundation of a wooden building to the upper wooden part. However, because reinforcing bars are heavy, there are limitations on the types of buildings to which the structure can be applied, and there are also issues with poor workability.

[0006] The present invention provides a reinforcing structure for wooden buildings whose components are lightweight and easy to work with. [Means for solving the problem]

[0007] The present invention is a reinforcement structure for a wooden building having a first anchor bolt that is inserted horizontally into the concrete foundation of a wooden building and fixed with a resin adhesive, a second anchor bolt that is inserted horizontally into the wood of the wooden building and fixed with a resin adhesive, a first fixing member fixed to the first anchor bolt, a second fixing member fixed to the second anchor bolt, and a stainless steel wire arranged between the first fixing member and the second fixing member. In the present invention configured as described above, the first anchor bolt is fixed to the concrete foundation of a wooden building, and the second anchor bolt is fixed to the wood of the wooden building. The first fixing member and the second fixing member are fixed to the first anchor bolt and the second anchor bolt, respectively. In this state, a stainless steel wire is disposed between the first fixing member and the second fixing member. This fixes the concrete foundation of the wooden building and the wood of the wooden building to each other, preventing them from moving apart.

[0008] In the above configuration, the stainless steel wire may be configured so that its cross section has a constant diameter of 6 to 12 mm. In the reinforcing structure configured as described above, a wooden building is reinforced with stainless steel wire, which has a relatively small diameter and is lightweight.

[0009] In the above configuration, two or more of the stainless steel wires may be arranged to cross each other. In the reinforcement structure constructed as described above, the stainless steel wires are crossed with each other to provide reinforcement against not only the vertical forces that occur between the concrete foundation of a wooden building and the wood of the wooden building, but also the horizontal forces.

[0010] In the above configuration, the stainless steel wire may be fixed to the first fixing member and the second fixing member by a clip having a wedge-shaped structure. In the reinforcing structure configured as described above, the stainless steel wire is fixed to the fixing member by the clip.

[0011] In the above configuration, the second anchor bolt may be fixed to a timber joist of the wooden building. The reinforcing structure configured as described above prevents the foundation of a wooden building from separating from the wooden joists. Effect of the Invention

[0012] The present invention can provide a reinforcement structure for wooden buildings whose components are lightweight and easy to work with. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a front view of a wooden building equipped with the reinforcing structure of the present invention. [Diagram 2] FIG. 2 is a side view of a wooden building equipped with a reinforcing structure of the present invention. [Diagram 3] FIG. 2 is a side view showing the anchor bolt and the fixing member fixed to the foundation of a wooden building. [Figure 4] FIG. 2 is a front view showing the state in which the reinforcing structure of the present invention is fixed to the foundation of a wooden building. [Diagram 5] FIG. 2 is a side view showing the state in which the reinforcing structure of the present invention is fixed to the timber of a wooden building. [Figure 6] FIG. 2 is a front view showing the state in which the reinforcing structure of the present invention is fixed to the timber of a wooden building. [Figure 7] 1 is a diagram illustrating the procedure for attaching the reinforcing structure of the present invention to a wooden building. [Figure 8] FIG. 4 is a cross-sectional view showing a mounting structure of a clip for fixing a stainless steel wire. [Figure 9] FIG. 13 is a perspective view showing a modified example of a clip for fixing a stainless steel wire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Embodiments of the invention will now be described, by way of example only, with reference to the drawings in which: FIG. 1 is a front view of a wooden building 1 equipped with the reinforcing structure of the present invention. FIG. 2 is a side view of the wooden building 1 equipped with the reinforcing structure of the present invention. The reinforcing structure of the present invention includes an anchor bolt 10 fixed to the foundation 2 of the wooden building 1, a fixing member 20 fixed to the anchor bolt 10, an anchor bolt 30 fixed to the wood 3 of the wooden building 1, a fixing member 40 fixed to the anchor bolt 30, a stainless steel wire 50 disposed between the fixing member 20 and the fixing member 40, and clips 60, 70 for fixing the stainless steel wire 50 to the fixing members 20, 40. The anchor bolt 10 fixed to the foundation 2 is called the first anchor bolt, and the anchor bolt 30 fixed to the wood 3 is called the second anchor bolt. The fixing member 20 fixed to the anchor bolt 10 is called the first fixing member, and the fixing member 40 fixed to the anchor bolt 30 is called the second fixing member. In the figure, components of the wooden building 1 are indicated by dashed lines, and components of the reinforcing structure are indicated by solid lines.

[0015] As shown in Fig. 1, two fixing members 20 are fixed to a foundation 2 at two different positions, left and right, below a wooden building 1, and two fixing members 40 are fixed to a piece of wood 3 at two different positions, left and right, above the wooden building 1. By arranging stainless steel wires 50 obliquely from the upper left fixing member 40 to the lower right fixing member 20 and from the upper right fixing member 40 to the lower left fixing member 20, the stainless steel wires 50 are arranged so as to cross each other at the middle position in the height direction. In this embodiment, two stainless steel wires 50 are fixed to each fixing member, and a total of four stainless steel wires 50 are arranged.

[0016] FIG. 3 is a side view showing the state in which the reinforcing structure of the present invention is fixed to the foundation 2 of a wooden building 1. FIG. 4 is a front view showing the state in which the reinforcing structure of the present invention is fixed to the foundation 2 of a wooden building 1. In FIGS. 3 and 4, the fixing member 20 is arranged so as to face vertically, but in reality, as shown in FIG. 1, the fixing member 20 is arranged so as to have a predetermined inclination angle with respect to the vertical direction. As shown in FIG. 1, two anchor bolts 10 are arranged side by side with their positions shifted up and down and left and right with respect to the foundation 2. A bolt hole 2A extending horizontally is formed in the concrete foundation 2 of the wooden building 1 using a drill or the like. The bolt hole 2A is a hole with a circular cross section. The anchor bolt 10 is formed in a straight line with a diameter of 22 mm. Since the depth of the bolt hole 2A is shorter than the overall length of the anchor bolt 10, when the anchor bolt 10 is inserted to the back of the bolt hole 2A, the anchor bolt 10 protrudes a predetermined length from the surface of the foundation 2. The anchor bolt 10 is inserted horizontally into the bolt hole 2A and disposed perpendicular to the wall surface of the wooden building 1. A resin adhesive 11 is inserted between the anchor bolt 10 and the bolt hole 2A, and the anchor bolt 10 is firmly fixed to the foundation 2 by the resin adhesive 11. HIT-RE500V3, an epoxy resin mortar manufactured by Hilti Corporation, is used as the resin adhesive 11. The anchor bolt 10 is fixed to the foundation 2 at one end and to a fixing member 20 at the other end. A thread is formed on the outer periphery of the other end of the anchor bolt 10 for screwing into a nut 23.

[0017] The fixing member 20 is composed of a flat steel 21 and an angle steel 22. In FIG. 4, the angle steel 22 is shown by a solid line, and the flat steel 21 is shown by a dashed line. In the overlapping portion between the flat steel 21 and the angle steel 22, the flat steel 21 is drawn to be slightly smaller than the angle steel 22 for convenience of drawing, but the two may be overlapped with the same size. The flat steel 21 has a rectangular lower portion in a front view and a hexagonal upper portion that is wider than the lower portion. Two circular first holes 21A for inserting the anchor bolt 10 are formed in the lower portion of the flat steel 21, arranged vertically. With the anchor bolt 10 inserted and passing through the first hole 21A, the nuts 23 are tightened from both sides of the flat steel 21 against the anchor bolt 10. As a result, the flat steel 21 is fixed to the anchor bolt 10. The angle steel 22 is formed in a hexagon so that its lower part has substantially the same shape as the upper part of the flat steel 21, and is placed on the wooden building 1 side with respect to the flat steel 21. The upper part of the angle steel 22 is folded back toward the front so as to form a right angle (90°), and has an inverted L-shaped cross section when viewed from the side. Two bolt holes are formed in each of the flat steel 21 and the angle steel 22, and bolts 24 are inserted into the bolt holes of the flat steel 21 and the angle steel 22, and the flat steel 21 and the angle steel 22 are fixed with nuts 25 so as to sandwich the flat steel 21 and the angle steel 22. Two circular second holes 22A are provided in the folded back part of the angle steel 22 for inserting the stainless steel wire 50. As described later, the stainless steel wire 50 is fixed to the fixing member 20 (angle steel 22) by attaching a clip 60 to the stainless steel wire 50 while tension is applied to the stainless steel wire 50.

[0018] FIG. 5 is a side view showing the state where the reinforcing structure of the present invention is fixed to the wood 3 of the wooden building 1. FIG. 6 is a front view showing the state where the reinforcing structure of the present invention is fixed to the wood 3 of the wooden building 1. Although FIGS. 5 and 6 show the fixing member 40 facing vertically, in reality, as shown in FIG. 1, the fixing member 40 is arranged to have a predetermined inclination angle with respect to the vertical direction. As shown in FIG. 1, two anchor bolts 30 are arranged side by side, shifting their positions in the up-down and left-right directions with respect to the wood 3. A bolt hole 3A extending horizontally is provided in the wood 3 of the joist (frame material) of the wooden building 1 using a drill or the like. The anchor bolt 30 is the same as the anchor bolt 10. The depth of the bolt hole 3A is shorter than the overall length of the anchor bolt 30, so that when the anchor bolt 30 is inserted to the back of the bolt hole 3A, the anchor bolt 30 protrudes a predetermined length from the surface of the wood 3. The anchor bolt 30 is inserted horizontally into the bolt hole 3A and arranged vertically with respect to the wall surface of the wooden building 1. A resin adhesive 31 is inserted between the anchor bolt 30 and the bolt hole 3A, and the resin adhesive 31 firmly fixes the anchor bolt 30 to the wooden piece 3. The resin adhesive 31 uses the same adhesive as the resin adhesive 11. The anchor bolt 30 is fixed to the wooden piece 3 at one end and to a fixing member 40 at the other end. A thread is formed on the outer periphery of the other end of the anchor bolt 30 for screwing into a nut 41.

[0019] The fixing member 40 is an angle steel that is folded back toward the front at a right angle (90°) at approximately the center and has an L-shaped cross section when viewed from the side. Two circular first holes 40A for inserting the anchor bolt 30 are provided on the side of the fixing member 40. Two circular second holes 40B for inserting the stainless steel wire 50 are provided on the bottom surface of the fixing member 40. With the anchor bolt 30 inserted into the first hole 40A and passing through it, the nuts 41 are tightened from both sides of the fixing member 40 to the anchor bolt 30. As a result, the fixing member 40 is fixed to the anchor bolt 30. As described later, the clip 70 is attached to the stainless steel wire 50 to fix the stainless steel wire 50 to the fixing member 40.

[0020] The stainless steel wire 50 has a circular cross section and a constant diameter of 6 to 12 mm. With the stainless steel wire 50 inserted into the second hole 40B of the fixing member 40, a clip 70 can be attached from above the fixing member 40. Furthermore, with the stainless steel wire 50 inserted into the second hole 22A of the fixing member 20, a clip 60 can be attached from below the fixing member 20.

[0021] The procedure for attaching the reinforcing structure of the present invention to a wooden building 1 will be described below. The position for placing the anchor bolt 10 relative to the foundation 2 of the wooden building 1 is determined. At the position for placing the anchor bolt 10, a bolt hole 2A is made using a drill or the like. Also, the position for placing the anchor bolt 30 relative to the wood 3 of the wooden building 1 is determined. At the position for placing the anchor bolt 30, a bolt hole 3A is made using a drill or the like. The anchor bolt 10 is inserted into the bolt hole 2A and fixed to the bolt hole 2A with a resin adhesive 11. The anchor bolt 30 is inserted into the bolt hole 3A and fixed to the bolt hole 3A with a resin adhesive 31.

[0022] The other end of anchor bolt 30 is inserted into first hole 40A of fixing member 40, and fixing member 40 is fixed to anchor bolt 30 with nut 41. Anchor bolt 10 is inserted into first hole 21A of fixing member 20, and fixing member 20 is fixed to anchor bolt 10 with nut 23. Stainless steel wire 50 is inserted into second hole 40B of fixing member 40, and clip 70 is attached to stainless steel wire 50 above fixing member 40. The structure of the clip will be described later.

[0023] As shown in FIG. 7, an angle iron is temporarily fixed to the bolt 24 that fixes the angle iron 22 and the flat bar 21 in advance as a tensioner mounting metal fitting 80. The tensioner mounting metal fitting 80 is folded back toward the front so that the lower part forms a right angle (90°), and has an L-shaped cross section when viewed from the side. The stainless steel wire 50 is inserted into the second hole 22A of the fixing member 20 (angle iron 22) and the hole 80A with a circular cross section formed on the bottom surface of the tensioner mounting metal fitting 80, and the lower end of the stainless steel wire 50 is attached to the tensioner 90. The stainless steel wire 50 is pulled downward by the tensioner 90, so that a predetermined load is applied to the stainless steel wire 50. A general hydraulic cylinder or the like can be used as the tensioner 90. The predetermined load is preferably 10 kN to 15 kN. With the predetermined load applied to the stainless steel wire 50, a clip 60 is attached below the angle iron 22.

[0024] FIG. 8 is a cross-sectional view showing the mounting structure of the clip 60. As shown in FIG. 8, the clip 60 is formed of a sleeve 61 and a wedge 62. The wedge 62 is a part that grips the stainless steel wire 50 by covering it from the outside, and has a structure that can be divided into two parts by sandwiching the stainless steel wire 50. A cavity that matches the diameter of the stainless steel wire 50 is formed inside the wedge 62, and a plurality of grooves are formed along the circumferential direction on the inside of the cavity (the inner peripheral surface of the wedge 62). The outer shape of the wedge 62 has a truncated conical (wedge-shaped) inclined surface whose outer diameter gradually decreases. The sleeve 61 has a cylindrical outer shape and has a truncated conical cavity whose inner diameter gradually decreases inside. The inner cavity of the sleeve 61 matches the outer shape of the wedge 62. After the stainless steel wire 50 is inserted into the second hole 22A of the fixing member 20, the stainless steel wire 50 is sandwiched by the wedge 62. In this state, the wedge 62 is inserted into the cavity of the sleeve 61, and the inclined surface formed on the outer wall of the wedge 62 slides in the internal cavity of the sleeve 61. This causes the sleeve 61 to gradually push the wedge 62 inward. As a result, the stainless steel wire 50 inserted inside the wedge 62 is pressed down by the wedge 62. As described above, the stainless steel wire 50 can be fixed by the clip 60. The structure of the clip 70 is the same as that of the clip 60. After the clip 60 is attached to the stainless steel wire 50, the stainless steel wire 50 is cut below the clip 60. The tensioner attachment metal fitting 80 is removed, and the nut 25 is retightened. By the above-mentioned procedure, the reinforcing structure of the present invention can be attached to the wooden building 1.

[0025] As described above, in the present invention, the stainless steel wire 50 can be arranged apart from the wall surface of the wooden building 1 by arranging the anchor bolts 10, 30 in a horizontal direction relative to the wooden building 1. This allows the reinforcement structure to be attached to various wooden buildings, and ensures workability when fixing the stainless steel wire 50. Since the anchor bolts 10, 30 are firmly fixed to the wooden building 1 by the resin adhesives 11, 31, the anchor bolts 10, 30 do not easily come off even if a strong force is applied in a direction to pull the anchor bolts 10, 30 out of the wooden building 1. In addition, since the angle steel 22 and the fixing member 40 of the fixing member 20 have an L-shaped cross section, the anchor bolts 10, 30 and the stainless steel wire 50 can be fixed in a state where they are perpendicular to each other. In other words, the stainless steel wire 50 can be fixed parallel to the wall with respect to the anchor bolts 10, 30 fixed perpendicular to the wall.

[0026] The stainless steel wire 50 is fixed to the fixing member 20 and the fixing member 40 under a predetermined load applied by the tensioner 90. By applying a load in a direction in which the fixing member 20 and the fixing member 40 approach each other, the foundation 2 and the wood 3 of the wooden building 1 can be prevented from moving away from each other. As a result, when a force is generated in a direction in which the foundation 2 and the wood 3 of the wooden building 1 are separated, the force is transmitted from the anchor bolt 10 to the stainless steel wire 50 via the fixing member 20, and the force is transmitted from the anchor bolt 30 to the stainless steel wire 50 via the fixing member 40, and the stainless steel wire 50 can absorb the force acting in the direction in which the foundation 2 and the wood 3 are separated. Therefore, it is possible to prevent the foundation 2 and the wood 3 from being separated and the wooden building 1 from collapsing. The stainless steel wire 50 has high tensile strength and can improve the tensile strength in the vertical direction of the wooden building 1. By arranging two or more stainless steel wires 50 so that they cross each other, the tensile strength in the horizontal direction of the wooden building 1 can also be improved. In addition, because the stainless steel wire 50 is fixed to the fixing members 20 and 40, even if the distance between the foundation 2 and the wood 3 of the wooden building 1 to be reinforced varies widely, the reinforcing structure of the present invention can be applied by simply changing the length of the stainless steel wire 50 without changing other components. By using the clips 60, 70, the stainless steel wire 50 can be easily fixed to the fixing members 20, 40.

[0027] FIG. 9 is a perspective view showing a modified example of a clip for fixing the stainless steel wire 50. The clip 100 shown in FIG. 9 can be used in place of the clips 60 and 70. The clip 100 is composed of a U-shaped member 101, a fastening member 102, and a nut 103. The U-shaped member 101 has two tip portions formed with threads for screwing with the nuts. The fastening member 102 has two insertion holes through which the tip portions of the U-shaped member 101 can be inserted. A recess is formed in the center of the fastening member 102. The center portion of the U-shaped member 101 and the recess of the fastening member 102 form an insertion hole 104 through which the stainless steel wire 50 can be inserted. With the stainless steel wire 50 inserted through the insertion hole 104, the nut 103 at the tip portion of the U-shaped member 101 is fastened. This reduces the distance between the U-shaped member 101 and the fastening member 102, and the U-shaped member 101 and the fastening member 102 fasten and fix the stainless steel 50. A two-part epoxy resin adhesive is injected between the U-shaped member 101 and the nut 103 to fix them together.

[0028] In the above embodiment, two stainless steel wires 50 are fixed to each fixing member, and a total of four stainless steel wires 50 are arranged to cross each other. However, the number of stainless steel wires 50 is not limited to this. At least one stainless steel wire 50 is effective, and five or more stainless steel wires 50 may be arranged. In order to improve strength, it is preferable to arrange three or more stainless steel wires 50 so that they cross each other.

[0029] In the above embodiment, an anchor bolt with a diameter of 22 mm is used, but the specifications of the anchor bolt to be used are not limited to this. An anchor bolt with a diameter and total length can be appropriately selected according to the portion to be used and the required reinforcing strength. In addition, the outer diameter and depth of the bolt hole provided in the foundation or wood are also changed according to the diameter and total length of the anchor bolt.

[0030] In the above embodiment, epoxy resin mortar is used as the resin adhesive, but the resin adhesive is not limited to this, and other resin adhesives may be used.

[0031] In the above embodiment, a structure in which two anchor bolts are fixed to one fixing member is used, but the number of anchor bolts is not limited to the above. A structure in which one anchor bolt is fixed to one fixing member, or a structure in which three or more anchor bolts are fixed to one fixing member may also be used.

[0032] In the above embodiment, angle steel or flat steel is used as the fixing member, but the fixing member is not limited to these. Any member may be used as long as the fixing member has two surfaces that are perpendicular to each other. For example, a curved surface portion may be interposed between a vertical surface and a horizontal surface. The fixing member is not limited to a plate shape, but may be formed into a solid block shape. For example, if the fixing member is formed into a rectangular column shape, the anchor bolt and the reinforcing bar can be fixed to two adjacent surfaces of the rectangular column, so that the anchor bolt and the reinforcing bar can be arranged vertically. Furthermore, the fixing member does not necessarily have to have perpendicular vertical and horizontal plates or two perpendicular surfaces. For example, the anchor bolt and the reinforcing bar can be arranged vertically by fixing the anchor bolt and the reinforcing bar on the outer periphery of a cylindrical or columnar fixing member with a 90° offset. The fixing member is not limited to a steel plate, and other metals, wood, resin, etc. that have sufficient strength can also be used.

[0033] In the above embodiment, a stainless steel wire with a diameter of 6 to 12 mm is used as a member fixed between two fixing members, but the diameter of the stainless steel wire used is not limited to this. The type of stainless steel wire can be appropriately selected according to the use of the wooden building and the strength of the reinforcement.

[0034] It goes without saying that the present invention is not limited to the above-mentioned embodiment. -Appropriately change and apply the mutually replaceable members and configurations disclosed in the above embodiments. · Appropriately replacing members and configurations that are not disclosed in the above embodiments but are publicly known and can be mutually substituted for the members and configurations disclosed in the above embodiments, and changing the combinations thereof for application. - Substitute members and configurations, etc. that are not disclosed in the above embodiments but that a person skilled in the art could imagine as substitutes for the members and configurations, etc. disclosed in the above embodiments based on publicly known techniques, and change the combinations and apply the present invention. is disclosed as one embodiment of the present invention. [Explanation of symbols]

[0035] 1...wooden building, 2...foundation, 2A...bolt hole, 3...wood, 3A...bolt hole, 10...anchor bolt, 11...resin adhesive, 20...fixing part, 21...flat steel, 22...angle iron, 23...nut, 24...bolt, 25...nut, 30...anchor bolt, 31...resin adhesive, 40...fixing part, 41...nut, 50...stainless steel wire, 60...clip, 70...clip, 80...metal fitting for attaching tensioner, 90...tensioner, 100...clip, 101...U-shaped part, 102...fastening part, 103...nut, 104...insertion hole.

Claims

1. A first anchor bolt that is horizontally inserted into a concrete foundation of a wooden building and fixed with a resin adhesive; A second anchor bolt is inserted horizontally into the timber of the wooden building and fixed with a resin adhesive; a first fixing member fixed to the first anchor bolt; a second fixing member fixed to the second anchor bolt; a stainless steel wire disposed between the first fixing member and the second fixing member; Reinforcement structure for wooden buildings.

2. 2. The reinforcement structure for a wooden building according to claim 1, wherein the cross section of the stainless steel wire has a constant diameter of 6 to 12 mm.

3. The reinforcement structure for a wooden building according to claim 1, characterized in that two or more of the stainless steel wires are arranged so as to cross each other.

4. 2. The reinforcing structure for a wooden building according to claim 1, wherein the stainless steel wire is fixed to the first fixing member and the second fixing member by a clip.

5. 2. The reinforcing structure for a wooden building according to claim 1, wherein the second anchor bolt is fixed to a timber of a joist of the wooden building.

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