Reinforcing structure

Abstract

To provide a reinforcing structure capable of surely fixing a reinforcing material such as a steel pipe to a wooden beam.SOLUTION: This reinforcing structure 10 reinforces the wooden beam 1 having a beam body 2 provided with a through-hole 3 in the beam width direction. In the reinforcement structure 10, the steel pipe 4 is provided in the beam body 2 along the circumferential direction of the through-hole 3, and the steel pipe 4 is integrated with the inner surface of the through-hole 3 facing the steel pipe 4 in the beam body 2 by an adhesive material 5. The inner surface of the through-hole 3 is provided with a recess 31 for improving the integrity of the steel pipe 4 and the beam body 2 by the adhesive 5, the recess 31 not penetrating the beam body 2 in the beam width direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a reinforcement structure for a wooden beam. [Background technology]

[0002] In recent years, the use of wooden materials as beams in buildings has been increasing. Drilling through-holes in these wooden beams to run plumbing and other equipment has the advantage of making effective use of the space above the ceiling and reducing the height of floors.

[0003] However, when through holes are drilled in wooden beams, cracks (splitting) originating from the through holes are likely to occur due to vertical loads and other factors applied to the wooden beam, reducing its strength. For this reason, Patent Document 1 discloses a reinforcing structure for wooden beams with through holes, in which a steel pipe with an axial rib or a steel pipe with a ring-shaped reinforcing part is placed inside the through hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-9481 Summary of the Invention [Problem to be solved by the invention]

[0005] To effectively reinforce wooden beams with steel pipes, it is important that the steel pipes are securely fixed to the wooden beams, and a method for securely fixing the steel pipes was needed.

[0006] In addition, in Patent Document 1, when arranging the steel pipe ribs, slits that penetrate the wooden beam in the beam width direction are required, which raises concerns about a decrease in the strength of the wooden beam.

[0007] The present invention has been made in view of the above-mentioned problems, and has as its object to provide a reinforcing structure etc. that can reliably fix a reinforcing material such as a steel pipe to a wooden beam. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention is a reinforcement structure for a wooden beam, wherein the wooden beam has a beam body with a through hole in the beam width direction, a tubular reinforcing material is provided in the beam body along the circumferential direction of the through hole, the reinforcing material is integrated with an opposing surface of the beam body that faces the reinforcing material by an adhesive, and the opposing surface is provided with a recess to improve the integration between the reinforcing material and the beam body by the adhesive, the recess not penetrating the beam body in the beam width direction.

[0009] In this invention, a cylindrical reinforcing member is fixed to the main body of a wooden beam with an adhesive, and a recess is provided on the surface of the beam body facing the reinforcing member. This recess improves the unity between the reinforcing member and the main body of the beam by the adhesive, allows wooden beams with through holes to be reliably reinforced by the reinforcing member, and prevents cracks in the wooden beam originating from the through holes. Furthermore, since the recess does not penetrate the main body of the beam in the beam width direction, it has little effect on the strength of the wooden beam.

[0010] The recesses are formed by roughening the opposing surface, for example. This allows the recesses to be formed easily. In addition, the unevenness improves the unity between the adhesive and the beam body, so that the reinforcing material is reliably fixed to the beam body.

[0011] The recess may be an injection hole for the adhesive that extends from the opposing surface to the surface of the beam body. The injection hole may extend from the opposing surface to a side surface of the beam body in the beam axis direction, or the injection hole may extend from the opposing surface to a top surface or a bottom surface of the beam body. In this case, the adhesive filled in the injection hole functions like an anchor, fixing the reinforcement material to the beam body and ensuring that the reinforcement material is securely fixed to the beam body. By extending the injection hole to the side, top, and bottom surfaces of the beam body as described above, the adhesive can be injected from these surfaces of the beam body.

[0012] The reinforcing material is, for example, a fiber reinforcing sheet provided on the inner surface of the through hole, which is the opposing surface. By using a fiber reinforcement sheet as the reinforcing material, the reinforcing material can have a simple structure and can be adapted to through holes of various diameters.

[0013] The reinforcing material may be a steel pipe or a wooden pipe made of a wooden material having a greater tensile strength than the wooden material used for the beam body. If steel pipes or wooden pipes made from wood with high tensile strength are used as reinforcing materials, the wooden beams can be reinforced efficiently while keeping the thickness of the reinforcing material to a minimum, and construction becomes easier. [Effects of the Invention]

[0014] The present invention can provide a reinforcing structure or the like that can reliably fix a reinforcing material such as a steel pipe to a wooden beam. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 shows a wooden beam 1 having a reinforcing structure 10. [Figure 2] FIG. 10 is a diagram showing an example in which a fiber-reinforced sheet 4a is used as a reinforcing material. [Figure 3] 1 is a diagram showing an outline of a wooden beam 100. FIG. [Figure 4] 10 is a diagram showing an example in which a fiber-reinforced sheet 4a is divided in the axial direction of a through-hole 3. FIG. [Figure 5] FIG. 4 shows a reinforcing plate 42 for a steel pipe 4. [Figure 6] FIG. 2 is a diagram showing an example of the arrangement of steel pipes 4. [Figure 7] 1 shows a wooden beam 1 having a reinforcing structure 10a. [Figure 8] 4A to 4C are diagrams illustrating the formation of an injection hole 32 and the filling of an adhesive 5. [Figure 9] FIG. 3 is a diagram showing an example of the arrangement of injection holes 32. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0017] [First embodiment] 1(a) and 1(b) are diagrams showing a wooden beam 1 having a reinforcement structure 10 according to a first embodiment of the present invention. FIG. 1(a) is a diagram showing a side view (hereinafter simply referred to as "side view") of the beam body 2 of the wooden beam 1 in the beam axis direction, and FIG. 1(b) is a diagram showing a cross section (hereinafter simply referred to as "cross section") in the beam width direction taken along line AA in FIG. 1(a). The beam axis direction corresponds to the left-right direction in FIG. 1(a) and the normal direction to the paper surface in FIG. 1(b). The beam width direction is a direction perpendicular to the beam axis direction on a plane, and corresponds to the normal direction to the paper surface in FIG. 1(a) and the left-right direction in FIG. 1(b).

[0018] The wooden beam 1 has a beam body 2, a steel pipe 4, etc. The reinforcing structure 10 reinforces the beam body 2 of the wooden beam 1 with the steel pipe 4.

[0019] The beam body 2 is a load-bearing part of the wooden beam 1 that mainly bears the load, and is formed into a beam shape from wooden material. The cross section of the beam body 2 is rectangular, but this is not limited to this. The wooden material is, for example, laminated timber with the fiber direction aligned with the beam axis, but other wooden materials with the fiber direction aligned with the beam axis or beam depth direction, such as CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), and BP (Binding Piling) material, may also be used. The beam depth direction corresponds to the up-down direction in Figures 1(a) and (b).

[0020] The beam body 2 has a through hole 3. The through hole 3 penetrates the beam body 2 in the beam width direction. The through hole 3 is for passing equipment piping and the like, and in this embodiment is circular and is formed in the center of the wooden beam 1 in the beam depth direction. However, the shape and position of the through hole 3 are not particularly limited.

[0021] In the reinforcing structure 10 of this embodiment, a steel pipe 4 is provided inside the through hole 3. The steel pipe 4 is a tubular reinforcing material that reinforces the wooden beam 1. The steel pipe 4 is cylindrical, but is not limited to this. For example, it may be rectangular. A wooden pipe may also be used instead of the steel pipe 4. In this case, it is desirable that the wooden material used for the wooden pipe has a greater tensile strength than the wooden material used for the beam body 2.

[0022] The steel pipe 4 is arranged along the circumferential direction of the through hole 3. In particular, in this embodiment, the steel pipe 4 is arranged along the inner surface of the through hole 3, and the inner surface of the through hole 3 becomes the opposing surface of the beam body 2 that faces the steel pipe 4. The steel pipe 4 is provided over the entire axial length of the through hole 3.

[0023] A recess 31 is provided on the inner surface of the through hole 3, recessed relative to the inner surface. The recess 31 is formed by roughening the inner surface of the through hole 3 with a woodworking drill or the like, and the depth of the recess 31 is approximately 5 mm. Unlike the slits in Patent Document 1, the recess 31 does not penetrate the beam body 2 in the beam width direction, and the effect on the strength of the wooden beam 1 can be reduced.

[0024] The steel pipe 4 is integrated with the beam body 2 by adhesive 5. The adhesive 5 is applied to the inner surface of the through hole 3, and the recess 31 increases the contact area between the inner surface of the through hole 3 and the adhesive 5, and the adhesive 5 in the recess 31 functions like a cotter, thereby enhancing the integration between the adhesive 5 and the beam body 2. As a result, the integration between the steel pipe 4 and the beam body 2 is improved.

[0025] The wooden beam 1 can be manufactured, for example, by forming a recess 31 on the inner surface of the through hole 3 in the beam body 2, applying an adhesive 5 to the inner surface of the through hole 3, and then placing a steel pipe 4 in the through hole 3 and fixing the steel pipe 4 to the inner surface of the through hole 3 with the adhesive 5.

[0026] As described above, in this embodiment, the steel pipe 4 is fixed to the beam body 2 of the wooden beam 1 with the adhesive 5. The recess 31 is provided on the inner surface of the through hole 3, which is the surface of the beam body 2 facing the steel pipe 4. This recess 31 improves the integration of the steel pipe 4 and the beam body 2 by the adhesive 5. This allows the wooden beam 1 with the through hole 3 to be reliably reinforced by the steel pipe 4. The tensile resistance of the steel pipe 4 prevents cracks (splitting) in the wooden beam 1 originating from the through hole 3. This allows the diameter of the through hole 3 to be larger relative to the beam depth of the wooden beam 1, lowering the hurdle for forming the through hole 3 in the wooden beam 1. As a result, the flexibility of the layout of equipment piping and the like is improved, which enables the reduction of the floor height of a building and the effective use of the space above the ceiling.

[0027] Furthermore, the recesses 31 in this embodiment are formed by roughening the inner surface of the through-hole 3, and are configured not to penetrate the beam body 2 in the beam width direction, so they have little effect on the strength of the wooden beam 1. Furthermore, the recesses 31 can be easily formed, and the unevenness improves the unity between the adhesive 5 and the beam body 2, ensuring that the steel pipe 4 is securely fixed to the beam body 2.

[0028] However, the present invention is not limited to the above embodiment. For example, in this embodiment, steel pipes 4 and wooden pipes are used as reinforcing materials for the wooden beam 1, but the reinforcing materials are not limited to these and may also be fiber-reinforced sheets arranged in a cylindrical shape.

[0029] 2(a) is a diagram showing an example of using a fiber-reinforced sheet 4a as a reinforcing material on the side of a wooden beam 1. In this example, one fiber-reinforced sheet 4a is attached in a cylindrical shape to the inner surface of the through-hole 3 with adhesive 5 (see FIG. 1(b)), and its circumferential ends 41 are arranged to overlap each other.

[0030] When attaching the fiber-reinforced sheet 4a, adhesive 5 is applied to the inner surface of the through-hole 3, and then the fiber-reinforced sheet 4a is placed on top of the adhesive 5, and an additional coat of adhesive 5 is applied while pressing the fiber-reinforced sheet 4a against the inner surface of the through-hole 3. Because the fiber-reinforced sheet 4a has a fine mesh, applying an additional coat of adhesive 5 while pressing the fiber-reinforced sheet 4a against the inner surface of the through-hole 3 allows the adhesive 5 on the front and back of the fiber-reinforced sheet 4a to become integrated via the mesh of the fiber-reinforced sheet 4a, and the fiber-reinforced sheet 4a can be firmly fixed to the inner surface of the through-hole 3.

[0031] The fiber reinforcement sheet 4a is provided over the entire axial length of the through hole 3, but may be provided with a space of about 10 mm from each end of the axial length of the through hole 3 to allow for the adhesive 5 to protrude.

[0032] It is desirable to position the circumferential end 41 of the fiber-reinforced sheet 4a so as to avoid positions in directions a1 to a4 inclined at 45° from the center C of the through-hole 3 relative to the beam axis direction H. That is, as shown in FIG. 3, stress generated around the through-hole 101 of the wooden beam 100 due to a vertical load, etc., is known to be large on the side of the wooden beam 100 at a position in the direction a inclined at approximately 45° from the center C of the through-hole 101 relative to the beam axis direction H, and to have a high possibility of cracks (splits) 102 in the beam axis direction starting from this position in the wooden beam 100 ("Study on the Strength of Glulam Beams with Circular Holes," Okamoto et al., Transactions on Structural Engineering, Architectural Institute of Japan, Vol. 85, No. 775, pp. 1199-1208, September 2020).

[0033] 2(a), the end 41 of the fiber-reinforced sheet 4a is positioned to avoid the positions in the four directions a1 to a4, so that the fiber-reinforced sheet 4a covers the positions in these directions a1 to a4, which are likely to be the starting points of cracks. This allows the tensile resistance of the fiber-reinforced sheet 4a to efficiently prevent the occurrence and progression of the cracks 102.

[0034] In this way, by using the fiber-reinforced sheet 4a as the reinforcing material, the reinforcing material has a simple structure and can accommodate through-holes 3 of various diameters. On the other hand, when steel pipes 4 or wooden pipes are used as the reinforcing material as described above, the wooden beam 1 can be reinforced efficiently while keeping the thickness of the reinforcing material small, and construction is also easy. Another advantage is that they can exert resistance to compression and shear.

[0035] In addition, if it is difficult to cover the entire inner surface of the through hole 3 with a single fiber reinforcement sheet 4a as shown in Figure 2(a), a fiber reinforcement sheet 4a covering half the circumference of the through hole 3 may be used, as shown in Figure 2(b), which is an enlarged view of the area around the through hole 3 on the side of the wooden beam 1.

[0036] In this example, two fiber-reinforced sheets 4a-1 (4a) are attached to the inner surface of the through hole 3 with an adhesive 5 in a semi-cylindrical shape, as described above, and the corresponding circumferential ends 41 of the fiber-reinforced sheets 4a-1 are arranged so that they abut each other. Furthermore, two fiber-reinforced sheets 4a-2 (4a) are attached to the inner surface of the fiber-reinforced sheet 4a-1 with an adhesive 5 in a semi-cylindrical shape, and the corresponding circumferential ends 41 of the fiber-reinforced sheets 4a-2 are arranged so that they abut each other. However, the end 41 of the fiber-reinforced sheet 4a-2 is arranged so that it is offset by 90° in the circumferential direction of the through hole 3 relative to the end 41 of the fiber-reinforced sheet 4a-1. In this case, too, the end 41 of the fiber-reinforced sheets 4a-1 and 4a-2 are arranged so as to avoid the positions in the four directions a1 to a4 described above.

[0037] In this way, strength can be improved by overlapping the fiber-reinforced sheets 4a in the radial direction of the through hole 3. In the example of FIG. 2(b), two fiber-reinforced sheets 4a-1 and 4a-2 are overlapped, but three or more fiber-reinforced sheets 4a can also be overlapped. Furthermore, in the example of FIG. 2(b), a fiber-reinforced sheet 4a is used that covers half the circumference of the through hole 3, but the fiber-reinforced sheet 4a may be an equal division of the length of one circumference of the through hole 3, such as one-third or one-quarter of the circumference.

[0038] In the above example, the fiber-reinforced sheet 4a is disposed over almost the entire axial length of the through hole 3, but as shown in Fig. 4, which is a cross section similar to Fig. 1(b), the fiber-reinforced sheet 4a may be divided in the axial direction of the through hole 3, with the fiber-reinforced sheet 4a disposed separately at each end of the axial direction of the through hole 3. When the width of the wooden beam 1 is large, providing a fiber-reinforced sheet 4a over the entire length of the through hole 3 requires workers on both sides of the wooden beam 1 in the beam width direction to simultaneously apply the fiber-reinforced sheet 4a. However, by dividing the fiber-reinforced sheet 4a in the axial direction of the through hole 3 as shown in Fig. 4, the fiber-reinforced sheet 4a can be applied by a single worker on one side of the wooden beam 1 in the beam width direction.

[0039] 5(a) and 5(b), which are side views and cross sections similar to those in FIGS. 1(a) and 1(b), the beam body 2a of the wooden beam 1a may be formed by overlapping two beam members 20 each having a through hole 30 in the beam axial direction, and a flange-shaped reinforcing plate 42 may be provided on the outer surface of the steel pipe 4 and placed between the beam members 20. By reinforcing the beam members 20 around the through hole 30 with the reinforcing plate 42, the occurrence and progression of the crack 102 described above can be further suppressed.

[0040] The beams 20 are beam-shaped components made of wood, and are arranged overlapping each other in the beam width direction so that their side surfaces 22 in the beam axis direction face each other. At this time, the positions of the through holes 30 in both beams 20 correspond in the beam axis direction and beam depth direction. The steel pipes 4 are fixed to the inner surfaces of the through holes 30 in both beams 20 with adhesive 5 (see Figure 1(b)), and the aforementioned recesses 31 are also provided on these inner surfaces.

[0041] The reinforcing plate 42 is a steel plate-like member that is provided in the axial center of the steel pipe 4 and fixed to the outer surface of the steel pipe 4 by welding or the like. The reinforcing plate 42 is arranged so as to be sandwiched between the opposing side surfaces 22 of both beams 20 and is housed in recesses 23 provided in the side surfaces 22 of both beams 20. The reinforcing plate 42 is fixed to the recesses 23 of both beams 20 with an adhesive or the like, which also improves the integrity of the steel pipe 4 and the beam main body 2a. The opposing side surfaces 22 of both beams 20 are in contact with each other at positions excluding the recesses 23.

[0042] 5(a), the outer shape of the reinforcing plate 42 is rectangular, but the outer shape of the reinforcing plate 42 is not limited to this and may be circular, etc. The recess 23 of the beam 20 has a shape corresponding to the outer shape of the reinforcing plate 42.

[0043] 6(a), as shown in a cross section similar to that of FIG. 5(b), both axial ends of the steel pipe 4 may be positioned inside the side surface of the wooden beam 1a, and both axial ends of the steel pipe 4 may be wrapped around the wooden material of the beam 20. This allows the wooden material to be used as fuel in the event of a fire.

[0044] As shown in Figure 6(b), a separate fire-resistant coating 9 may be applied to the inside of the steel pipe 4. The fire-resistant coating 9 is a tubular member placed along the inner surface of the steel pipe 4, and is made of wood or other material impregnated with a flame retardant. Alternatively, a wooden pipe that does not have flame retardant properties may be placed inside the steel pipe 4. In this case, the wooden pipe is considered to be a fuel for a fire.

[0045] While the steel pipes 4 in Figures 5(b), 6(a), and (b) are arranged along the inner surface of the through hole 30, as shown in Figure 6(c), the steel pipes 4 may be set back from the inner surface of the through hole 30 into the interior of the beam 20. Each beam 20 is provided with a groove 26 for inserting the steel pipe 4, and by inserting the steel pipe 4 into the groove 26 of each beam 20, it is possible to prevent the beams 20 from shifting in position relative to each other. It is also possible to fix the steel pipe 4 to the inner surface of the groove 26 with adhesive 5, and a recess similar to the recess 31 described above can be provided on the inner surface (the surface facing the steel pipe 4).

[0046] Furthermore, the recesses 31 in this embodiment are formed by roughening the inner surfaces of the through holes 3, 30, etc., and improve the unity of the steel pipes 4, etc. and the beam bodies 2, 2a by the adhesive 5, but recesses for the purpose of improving unity are not limited to this. Below, another example of a recess will be described as the second embodiment. In the second embodiment, differences from the first embodiment will be mainly described, and similar points may be denoted by the same reference numerals in the drawings, etc., and description thereof may be omitted.

[0047] [Second embodiment] 7(a) and (b) are diagrams showing a wooden beam 1 having a reinforcing structure 10a according to a second embodiment of the present invention. Fig. 7(a) is a diagram showing the side of the wooden beam 1, and Fig. 7(b) is a diagram showing a cross section in the beam width direction taken along line BB in Fig. 7(a).

[0048] In this embodiment, an injection hole 32 for the adhesive 5 is formed in the beam body 2 as a recess recessed from the inner surface of the through hole 3. The injection hole 32 is formed by drilling the beam body 2 from the inner surface side of the through hole 3 with a drill or the like, so that it is inclined at an angle of approximately 45° from the inner surface of the through hole 3 to the axial direction of the through hole 3, as shown in Figure 8(a), which is a cross section similar to Figure 7(b), and reaches the side of the beam body 2. Unlike the slits in Patent Document 1, the injection hole 32 does not penetrate the beam body 2 in the beam width direction, and therefore its effect on the bearing capacity of the wooden beam 1 can be reduced.

[0049] After the injection hole 32 is formed, the adhesive 5 is injected into the injection hole 32 from the side of the beam main body 2, filling the injection hole 32 with the adhesive 5 as shown in FIG. 8(b). Filling of the adhesive 5 is completed when it is confirmed that the adhesive 5 has overflowed from the end of the injection hole 32 on the through hole 3 side. Thereafter, more adhesive 5 is applied to the inner surface of the through hole 3, and the fiber reinforcement sheet 4a is attached to the inner surface of the through hole 3 using the same procedure as above. Because the adhesive 5 inside the injection hole 32 is exposed on the side of the beam main body 2, it may be painted with a wood-grain finish, if necessary, to enhance the design.

[0050] 7(a), the injection holes 32 are formed in a total of eight directions on the side surface of the wooden beam 1, for example, four directions inclined at 22.5° from the center C of the through hole 3 relative to the beam axis direction H and four directions inclined at 22.5° relative to the beam depth direction V. However, the injection holes 32 only need to be formed in a direction intersecting the fiber direction of the beam body 2, and the number of holes and the angle relative to the beam axis direction H, etc. are not limited to those described above.

[0051] In the reinforcement structure 10a of this embodiment, an injection hole 32 extending to the side of the beam body 2 is provided as a recess on the inner surface of the through hole 3 in the beam body 2, and the adhesive 5 filled in the injection hole 32 functions as an anchor, fixing the fiber-reinforced sheet 4a to the beam body 2 and reliably securing the fiber-reinforced sheet 4a to the beam body 2. In addition, the adhesive 5 filled in the injection hole 32 can bear the tensile stress generated in the wooden beam 1, so the area around the through hole 3 in the beam body 2 is also reinforced.

[0052] In this embodiment, a fiber-reinforced sheet 4a is used as the reinforcing material for the inner surface of the through hole 3, but steel pipes 4 or wooden pipes can also be used. In this embodiment, the injection holes 32 are drilled from the inner surface of the through hole 3, but the injection holes 32 may also be drilled from the side of the beam body 2 toward the inner surface of the through hole 3.

[0053] Furthermore, the injection hole 32 may not only extend to the side surface of the beam body 2, but also to other surfaces of the beam body 2, i.e., the top or bottom surface of the beam body 2. For example, as shown in FIG. 9(a) with a side view similar to that of FIG. 7(a), the injection hole 32 may extend from the inner surface of the through hole 3 in the beam depth direction and reach the top and bottom surfaces of the beam body 2. The injection hole 32 can be formed by inserting a drill or the like from the top or bottom surface of the beam body 2 in the beam depth direction to drill through the beam body 2 to the inner surface of the through hole 3. The adhesive 5 can be injected from the top or bottom surface of the beam body 2.

[0054] 9(b) is a view of the top surface of beam body 2 in FIG. 9(a). Injection holes 32 include, for example, injection holes 32-1 and 32-4 located on both radial sides of through hole 3 in a plan view, and injection holes 32-2 and 32-3 located in the radial middle of through hole 3. The latter injection holes 32-2 and 32-3 are located closer to the central axis M1 of beam body 2 than the former injection holes 32-1 and 32-4, and injection holes 32-1 and 32-2 and injection holes 32-3 and 32-4 are arranged line-symmetrically with respect to the central axis M2 of through hole 3. Furthermore, injection holes 32-1 to 32-4 are arranged in pairs line-symmetrically with respect to the central axis M1 of beam body 2.

[0055] The distance D in the beam width direction between the injection holes 32-1 (32-4) and 32-2 (32-3) and the distance D in the beam width direction between the injection holes 32-2 (32-3) on either side of the central axis M1 of the beam main body 2 are both approximately 1 / 4 of the beam width, but this is not limited to this. Furthermore, if the beam width of the wooden beam 1 is small, the injection holes 32-2 and 32-3 on the radially inner side of the through hole 3 may be omitted. The above also applies to the injection holes 32-1 to 32-4 extending from the inner surface of the through hole 3 to the bottom surface of the beam main body 2.

[0056] These injection holes 32-1 to 32-4 are provided near positions a1 to a4 (see Figure 2(a)) inclined at 45° from the center C of the through hole 3 to the beam axis direction, and the adhesive 5 filled in the injection holes 32 bears the tensile stress generated in the wooden beam 1, thereby resisting cracks in the beam body 2 at the above positions.

[0057] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0058] 1, 1a, 100: Wooden beam 2, 2a: Beam body 3, 30: Through holes 4: Steel pipe 4a, 4a-1, 4a-2: Fiber reinforced sheet 5:Adhesive 9: Fireproof coating 10, 10a: Reinforcement structure 31: Recess 32, 32-1~32-4: Injection hole

Claims

1. A reinforcement structure for wooden beams, The wooden beam has a beam body with a through hole in the beam width direction, A cylindrical reinforcing member is provided on the beam body along a circumferential direction of the through hole, The reinforcing member is integrated with an opposing surface of the beam body that faces the reinforcing member by an adhesive, A reinforcement structure characterized in that a recess is provided on the opposing surface to improve the integrity of the reinforcing material and the beam body using the adhesive, the recess not penetrating the beam body in the beam width direction.

2. 2. The reinforcement structure according to claim 1, wherein the recesses are formed by roughening the opposing surfaces.

3. 2. The reinforcement structure according to claim 1, wherein the recess is an injection hole for the adhesive material extending from the opposing surface to the surface of the beam body.

4. 4. The reinforcement structure according to claim 3, wherein the injection hole extends from the opposing surface to a side surface of the beam body in the beam axis direction.

5. 4. The reinforced structure according to claim 3, wherein the injection holes extend from the opposing surfaces to the top or bottom surface of the beam body.

6. 2. The reinforced structure according to claim 1, wherein the reinforcing material is a fiber reinforcing sheet provided on the inner surface of the through hole, which is the opposing surface.

7. 2. The reinforced structure according to claim 1, wherein the reinforcing material is a steel pipe or a wooden pipe made of a wooden material having a tensile strength greater than that of the wooden material used for the beam body.

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