Reinforcing structure

Abstract

To provide a reinforcing structure or the like capable of reinforcing a wooden beam having a through-hole with a simple structure.SOLUTION: In the wooden beam 1, a plurality of beam materials 2 are overlapped in a beam width direction so that facing surfaces 22 which are side surfaces of the beam materials 2 in a beam axial direction face each other. In the reinforcing structure 10, a beam material 2 of a wooden beam 1 is reinforced by a reinforcing plate 4. The beam material 2 has a through-hole 21 penetrating in the beam width direction, and a reinforcing plate 4 having a hole 41 at a position corresponding to the through-hole 21 is arranged between facing surfaces 22 of the plurality of beam materials 2.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, drilling through holes in wooden beams is expected to reduce bearing strength. Therefore, Patent Document 1 discloses a reinforcement structure for wooden beams with through holes, in which a steel plate is inserted into a slit in the wooden beam that reaches the through hole, and the position of the penetration provided in the steel plate corresponds to the position of the through hole in the wooden beam. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-63336 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the reinforcement structure of Patent Document 1 requires highly accurate processing of slits in the wooden beams, which makes manufacturing the wooden beams time-consuming. In addition, the need to insert steel plates into the slits limits the shape and arrangement of the steel plates.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a reinforcement structure etc. that can reinforce a wooden beam having a through hole with a simple configuration. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention is a reinforcing structure for a wooden beam, in which the wooden beam is made by stacking multiple beam materials in the beam width direction so that opposing surfaces, which are the sides of the beam materials in the beam axis direction, face each other, and the beam materials have through holes that pass through in the beam width direction, and a reinforcing plate having holes at locations corresponding to the through holes is arranged between the opposing surfaces of the multiple beam materials.

[0008] In this invention, a reinforcing plate with holes corresponding to the through holes of the beams is placed between the opposing surfaces of the beams that make up the wooden beam. This allows the wooden beam to be reinforced with a simple structure. Furthermore, since the reinforcing plate can be sandwiched between the beams, installation is easy and there are no restrictions on the shape or placement of the reinforcing plate.

[0009] The reinforcing plate may be, for example, a steel member, or may be a wooden member, and the shear strength and bending strength of the wooden material used for the reinforcing plate may be higher than those of the wooden material used for the beam. When the reinforcing plate is made of steel, as in the former case, it can be easily processed according to the purpose of reinforcement and the target reinforcement performance, allowing for efficient reinforcement. When the reinforcing plate is made of wood, as in the latter case, it is possible to create a frame that is environmentally friendly by making extensive use of wood materials. Furthermore, by making the shear strength and bending strength of the wood material used for the reinforcing plate higher than that of the wood material used for the beams, it is possible to effectively reinforce the structure while keeping the thickness of the reinforcing plate small.

[0010] A recess for accommodating the reinforcing plate may be provided on the opposing surface of at least one of the beams, and the opposing surfaces of the multiple beams may contact each other at a location different from the recess, and a first shear force transmission mechanism for transmitting shear force between the multiple beams may be provided at that location. This allows the reinforcing plate to be housed inside the wooden beam, improving the design of the wooden beam. In addition, the shear force transmission mechanism transmits shear force between the opposing surfaces of the beam, integrating the beam.

[0011] It is desirable to provide a second shear force transmission mechanism for transmitting shear force between the beam and the reinforcing plate. This allows shear force to be transmitted between the beam and the reinforcing plate, integrating the beam and the reinforcing plate.

[0012] It is desirable that the reinforcing plate be arranged so as to cover four positions inclined at 45° from the center of the through hole with respect to the beam axis direction. This allows the areas around the through holes in the beam material that are prone to becoming crack starting points to be reinforced with the reinforcing plate, thereby efficiently preventing the occurrence and progression of cracks.

[0013] The fuel cell may further include a cylindrical reinforcing tube provided along the circumferential direction of the through hole, and the reinforcing plate may be attached to an outer surface of the reinforcing tube. This allows the wall of the through hole to be reinforced by the reinforcing pipe, thereby preventing the occurrence and progression of the above-mentioned cracks. [Effects of the Invention]

[0014] The present invention can provide a reinforcement structure or the like that can reinforce a wooden beam having a through hole with a simple configuration. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 shows a wooden beam 1. [Figure 2] FIG. 2 is an exploded perspective view of the beam 2 and the reinforcing plate 4. [Figure 3] FIG. 2 is a diagram showing a recess 23 in a beam 2 and a shear force transmission mechanism 5. [Figure 4] FIG. 2 is a diagram showing shear force transmission mechanisms 5a to 5d. [Figure 5] 10 shows an example of the shape of the reinforcing plate 4. [Figure 6] An example of an X-shaped reinforcing plate 4. [Figure 7] 1 is a diagram showing an outline of a wooden beam 100. FIG. [Figure 8] FIG. [Figure 9] An example of fixing a reinforcing plate 4 to a beam 2 with a drill screw 42. [Figure 10]FIG. 2 is a diagram showing shear force transmission mechanisms 7 and 7a. [Figure 11] FIG. [Figure 12] 3A and 3B are diagrams showing examples of arrangement of a reinforcing plate 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

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

[0017] (1. Wood beam 1) Fig. 1 shows a wooden beam 1 having a reinforcement structure 10 according to an embodiment of the present invention. Fig. 1(a) is a diagram showing a side view of the wooden beam 1 in the beam axis direction, and Fig. 1(b) is a diagram showing a cross section of the wooden beam 1 perpendicular to the beam axis direction. Fig. 1(b) is a cross section 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).

[0018] The wooden beam 1 has a beam material 2 and a reinforcing plate 4. The reinforcing structure 10 reinforces the beam material 2 of the wooden beam 1 with the reinforcing plate 4.

[0019] The beam 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 2 perpendicular to the beam axis direction is, for example, rectangular. The wooden material is, but is not limited to, laminated timber with the fiber direction in the beam axis direction. For example, other wooden materials with the fiber direction in the beam axis direction or beam depth direction, such as CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), and BP material, may also be used. The beam depth direction corresponds to the up and down direction in Figures 1(a) and (b).

[0020] As shown in Figure 1(b), the wooden beam 1 is formed by stacking multiple beam materials 2 in the beam width direction so that opposing surfaces 22, which are the side surfaces in the beam axis direction, face each other. The beam width direction is a direction perpendicular to the beam axis direction and the beam depth direction, and corresponds to the normal direction to the paper surface of Figure 1(a) and the left-right direction of Figure 1(b).

[0021] The beam 2 has a through hole 21. The through hole 21 is provided so as to penetrate the beam 2 in the beam width direction. As shown in FIG. 1(a), in this embodiment, the through hole 21 is formed in the center of the beam 2 in the beam depth direction, and its cross section is circular. However, the position and shape of the through hole 21 are not particularly limited. The through hole 21 is for passing equipment piping and the like through the wooden beam 1, and in the wooden beam 1, the positions of the through holes 21 of two beams 2 in the beam axis direction and beam depth direction correspond to each other.

[0022] 2 is an exploded perspective view of the beam 2 and reinforcing plate 4 of the wooden beam 1. The reinforcing plate 4 is a rectangular steel member (steel plate) with a hole 41. It is sandwiched between the opposing surfaces 22 of both beams 2 of the wooden beam 1 and fixed to both beams 2 with adhesive (not shown) or the like. A regular flat steel plate can be used as the reinforcing plate 4. The hole 41 is a circular hole with approximately the same diameter as the through hole 21, and is placed at a position corresponding to the through hole 21 of the beam 2.

[0023] The size of the steel plate is determined according to the strength and reinforcing range required for the reinforcing plate 4. For example, the thickness of the steel plate is set between 1 and 22 mm, and the length and width of the steel plate are set so as to cover at least a circular area R around the through hole 21 with a width of H / 30, where H is the beam depth of the wooden beam 1. This is the area where the most damage was observed in previous research results. However, the thickness and length and width of the steel plate are not limited to this. Furthermore, in addition to ordinary steel plate, checkered steel plate, punched metal, etc. can also be used for the reinforcing plate 4.

[0024] As explained above, in the reinforcement structure 10 of this embodiment, a reinforcing plate 4 having holes 41 at locations corresponding to the through holes 21 of the beams 2 is placed between the opposing surfaces 22 of the beams 2 that make up the wooden beam 1. This allows the wooden beam 1 to be reinforced with a simple configuration. Furthermore, since the reinforcing plate 4 can be sandwiched between the beams 2, construction can be carried out easily. Reinforcement using the reinforcing plate 4 allows the diameter of the through holes 21 to be larger relative to the beam depth of the wooden beam 1, and also lowers the hurdle of forming the through holes 21, etc. in the wooden beam 1. As a result, the degree of freedom in arranging equipment piping and the like is improved, making it possible to reduce the floor height of a building and make effective use of the space above the ceiling.

[0025] Furthermore, in this embodiment, by using a steel plate as the reinforcing plate 4, processing according to the purpose of reinforcement and the target reinforcement performance becomes easy, and efficient reinforcement becomes possible.

[0026] However, the present invention is not limited to the above embodiment. For example, in the example of Fig. 1(b), a gap corresponding to the thickness of the reinforcing plate 4 is formed between the beams 2, which may cause a problem in terms of the design when looking up at the wooden beam 1. In contrast, as shown in Fig. 3(a), which is a cross section similar to Fig. 1(b), recesses 23 for accommodating the reinforcing plate 4 can be formed by seat carving on the opposing surfaces 22 of both beams 2 of the wooden beam 1. This allows the opposing surfaces 22 of the beams 2 to contact each other except for the recesses 23, and the reinforcing plate 4 to be housed inside the wooden beam 1. This improves the design of the wooden beam 1.

[0027] In the example of FIG. 3(a), recesses 23 are provided on the opposing surfaces 22 of both beams 2. However, as shown in FIG. 3(b), recesses 23 may be provided only on the opposing surface 22 of one of the beams 2 (the beam 2 on the right side in the example). In the example of FIG. 3(b), a shear force transmission mechanism 5 (first shear force transmission mechanism) is further provided to transmit shear force at the contact point between the opposing surfaces 22 of both beams 2. This allows shear force to be transmitted between the beams 2, integrating the beams 2 together. While a similar shear force transmission mechanism 5 can be provided in the example of FIG. 3(a), the case of FIG. 3(b) is particularly preferable because the reinforcing effect of the reinforcing plate 4 in the recess 23 can be transmitted to the beam 2 without the recess 23 (the beam 2 on the left side in the example).

[0028] The shear force transmission mechanism 5 in Fig. 3(b) is a pin that is provided across the opposing surfaces 22 of both beams 2, but the shear force transmission mechanism 5 is not limited to this. For example, as shown in Fig. 4(a), it is also possible to use drift pins that pass through through holes 25 in the beam width direction of both beams 2 as the shear force transmission mechanism 5a. In this case, to prevent the drift pins, which are made of steel, from being exposed on the side surfaces of the wooden beams 1 (the side surfaces opposite the opposing surfaces 22 of the beams 2) and forming thermal bridges, it is desirable to make the drift pins slightly shorter and plug the ends of the through holes 25 in each beam 2 that are on the side surfaces of the wooden beams 1 with wooden plugs or the like.

[0029] Alternatively, as shown in FIG. 4(b), a shear force transmission mechanism 5b can be formed by driving a screw across both beams 2. Alternatively, as shown in FIG. 4(c), a shear force transmission mechanism 5c can be formed by placing a steel plate with protrusions on both sides between the beams 2, with the protrusions on both sides of the steel plate penetrating into both beams 2. The steel plate can be a metal plate connector whose back surfaces (the surfaces without protrusions) are joined by welding or other means. Alternatively, as shown in FIG. 4(d), a cylindrical steel dowel can be used, with both axial ends of the dowel penetrating into both beams 2. A shear plate or split ring can be used as the dowel. Alternatively, shear force can be transmitted simply by bonding the opposing surfaces 22 of the beams 2 together with an adhesive (not shown).

[0030] In this embodiment, the wooden beam 1 is formed by stacking two beams 2, but a wooden beam may also be formed by stacking three or more beams 2 in the same way. In this case, the reinforcing plates 4 may be provided between the facing surfaces 22 of all adjacent beams 2, or may be provided only between the facing surfaces 22 of some of the beams 2. In the latter case, the number of reinforcing plates 4 can be determined taking into consideration the distance between the reinforcing plates 4, etc.

[0031] Furthermore, since the reinforcing plate 4 can be sandwiched between the beam members 2, there are no limitations on the shape or arrangement of the reinforcing plate 4, as in the case of Patent Document 1 mentioned above. For example, as shown in FIG. 5(a), which is a side view similar to FIG. 1(a), the reinforcing plate 4 can be arranged in a diamond shape. In the examples of FIGS. 1(a) and 5(a), the reinforcing plate 4 is rectangular, which has the advantage of being easy to process and expected to improve strength. On the other hand, the reinforcing plate 4 can also be circular, as shown in FIG. 5(b), which allows the aforementioned range R (see FIG. 2) to be covered with a steel plate of a minimal area. However, processing is slightly more difficult than with a rectangular reinforcing plate 4.

[0032] 6(a), the reinforcing plate 4 may be an X-shaped plate. As shown in FIG. 7, stress generated around a through hole 101 in a wooden beam 100 due to a vertical load or the like increases at a position a on the side surface of the wooden beam 100 in the beam axis direction, which is inclined at approximately 45° from the center C of the through hole 101 to the beam axis direction H, and it is known that a crack (split) 102 in the beam axis direction is likely to occur in the wooden beam 100 starting from this position ("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] The X-shaped reinforcing plate 4 shown in Fig. 6(a) is arranged so as to cover the position from the center C of the through hole 21 along four directions a1 to a4 that are inclined at approximately 45° with respect to the beam axis direction H, thereby reinforcing the areas where cracks are likely to occur and progress, and is expected to improve strength. Note that the reinforcing plate 4 in Fig. 1(a) and the reinforcing plates 4 in Figs. 5(a) and (b) are also arranged so as to cover the above-mentioned positions, but the X-shaped reinforcing plate 4 is preferable because it is arranged so as to cover the above-mentioned positions more widely.

[0034] As shown in Figure 6(b), the upper end of the reinforcing plate 4 may be protruded from the upper surface of the wooden beam 1 and embedded in the concrete slab 3 on top of the wooden beam 1. This allows the reinforcing plate 4 to function as a shear connector, integrating the wooden beam 1 with the concrete slab 3. Note that the configuration in which the upper end of the reinforcing plate 4 protrudes from the upper surface of the wooden beam 1 and is used as a shear connector can be applied regardless of the shape or arrangement of the reinforcing plate 4.

[0035] Furthermore, the reinforcing plate 4 in FIG. 6(a) is a single X-shaped steel plate, but as shown in FIG. 8, which is an exploded view similar to FIG. 2, two parallelogram-shaped reinforcing plates 4 may be sandwiched between the opposing surfaces 22 of the beam members 2, and these two reinforcing plates 4 may be stacked to form the same X-shape as in FIG. 6(a). Each reinforcing plate 4 is accommodated in a recess 23 provided on the opposing surfaces 22 of both beam members 2. Although using two reinforcing plates 4 increases the weight, it is easier to process the reinforcing plate 4 than an X-shaped reinforcing plate 4. Another advantage is that both beam members 2 can be reinforced with individual steel plates.

[0036] Alternatively, as shown in Figure 9, which is a cross section similar to Figure 1(b), reinforcing plates 4 placed in recesses 23 on the opposing surfaces 22 of both beams 2 constituting a wooden beam 1 may be fixed to the beams 2 with drill screws 42. In this case, the depth of the recesses 23 is determined so that the heads of the drill screws 42 do not protrude from the position of the opposing surfaces 22, and a gap is provided between the reinforcing plates 4.

[0037] 10(a), a shear force transmission mechanism 7 (second shear force transmission mechanism) may be provided to transmit shear force between the reinforcing plate 4 and the beam 2. This allows the shear force to be transmitted between the beam 2 and the reinforcing plate 4, integrating the beam 2 and the reinforcing plate 4. The shear force transmission mechanism 7 in FIG. 10(a) is a shear plate, split ring, or other excavation dowel, similar to the shear force transmission mechanism 5 in FIG. 4(d), and is joined to both sides of the reinforcing plate 4, with its cylindrical wall portion penetrating into the beam 2.

[0038] As shown in Figure 10(b), bolts 71 may be provided that pass through the inside of the dowels and penetrate both beams 2 and the reinforcing plate 4 in the beam width direction, allowing the shear force applied to the dowels to be transmitted over a wide area of ​​the beam 2 in the beam width direction via the bolts 71. Nuts 72 are fastened to both ends of the bolts 71. The ends of the bolts 71 and the nuts 72 may protrude from the beam 2 as shown in Figure 10(b) and be covered with a covering material (not shown), or they may be housed in recesses formed in the side of the beam 2 opposite the opposing surface 22, and the recesses may be filled with wooden hole-filling material. This allows the side of the wooden beam 1 to be smoothed.

[0039] As shown in Figure 10(c), drift pins can also be used as shear force transmission mechanisms 7a. The drift pins are passed through through holes 25 formed in the beams 2 in the beam width direction, penetrating both beams 2 and the reinforcing plates 4 in the beam width direction. As mentioned above, to prevent the drift pins from being exposed on the side surfaces of the wooden beams 1 and becoming thermal bridges, it is desirable to shorten the drift pins slightly and plug the ends of the through holes 25 on the side surfaces of the wooden beams 1 with wooden plugs or the like. The bolts 71 in Figure 10(b) can also be used alone as shear force transmission mechanisms.

[0040] 4(c), a steel plate with protrusions on both sides may be used as the reinforcing plate 4, and the protrusions may bite into both beams 2, thereby transmitting shear force between the reinforcing plate 4 and the beams 2. Alternatively, shear force can be transmitted simply by bonding the reinforcing plate 4 and the beams 2 with an adhesive (not shown) such as epoxy resin.

[0041] 11(a), a cylindrical reinforcing tube 8 may be provided along the circumferential direction of the through hole 21 of both beam members 2, and a reinforcing plate 4 may be attached to the outer surface of the reinforcing tube 8. The reinforcing tube 8 may be, for example, a steel pipe, and is arranged along the inner surface of the through hole 21 and bonded to the inner surface with an adhesive. The reinforcing plate 4 is joined to the outer surface of the reinforcing tube 8 by welding or the like to form an integrated structure. The reinforcing tube 8 reinforces the wall of the through hole 21 and suppresses the occurrence and progression of cracks as described in FIG. 7.

[0042] Both axial ends of the reinforcing pipe 8 are wrapped around the wooden material of the beam 2, allowing the wooden material to serve as fuel in the event of a fire. Note that the sides of the wooden beam 1 may be provided with a fire-resistant coating, in which case both ends of the reinforcing pipe 8 may be exposed to the sides of the wooden beam 1 and not covered by the wooden material, as shown in Figure 11(a).

[0043] 11(b), a separate fire-resistant coating 9 may be applied to the inside of the reinforcing pipe 8. The fire-resistant coating 9 is a tubular member that is placed along the inner surface of the reinforcing pipe 8 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 reinforcing pipe 8. In this case, the wooden pipe is considered to be a fuel for fire.

[0044] 11(a) and (b) are arranged along the inner surface of the through hole 21, but as shown in FIG. 11(c), the reinforcing pipe 8 may be arranged set back from the inner surface of the through hole 21 into the interior of the beam 2. A groove 26 for inserting the reinforcing pipe 8 is provided in each beam 2. By inserting the reinforcing pipe 8 into the groove 26 of each beam 2, it is possible to prevent misalignment between the beams 2. Note that the reinforcing pipe 8 is not limited to being cylindrical. For example, the cross section of the reinforcing pipe 8 may be rectangular, or it may be arranged in a diamond shape as in FIG. 5(a).

[0045] Although the reinforcing plate 4 is made of steel in this embodiment, it can also be made of wood, providing a lightweight frame that makes extensive use of wood materials and is environmentally and aesthetically pleasing. Furthermore, since the reinforcing plate 4 and the beams 2 are made of the same material, they have good compatibility. Since the reinforcing plate 4 and the beams 2 can be processed in the same factory, workability is improved. Materials that can be used for the reinforcing plate 4 include plywood, LVL (Class A structural LVL, Class B structural LVL), CLT, OSB (Oriented Strand Board), and LSL (Laminated Strand Lumber). Class B structural LVL is particularly suitable because its orthogonal veneer (orthogonal veneer) contributes to reinforcement. However, in the example shown in Figure 6(b), in which the upper end of the reinforcing plate 4 is used as a shear connector, the reinforcing plate 4 is made of steel.

[0046] When the reinforcing plate 4 is made of wood, it is desirable that the shear strength and bending strength of the wood material used for the reinforcing plate 4 be higher than that of the wood material used for the beam 2. This allows for effective reinforcement while keeping the thickness of the reinforcing plate 4 small. Even if the shear strength or bending strength is lower than that of the wood material used for the beam 2, it can still be used as the reinforcing plate 4 by adjusting the thickness and shape of the plate material so that an appropriate reinforcing effect is obtained. In the example of Figures 11(a) to (c), by using the reinforcing tube 8 as a wooden tubular member as well, the wooden reinforcing plate 4 and the reinforcing tube 8 can be joined together with adhesive, screws, etc.

[0047] When using a wooden reinforcing plate 4, the shape of the reinforcing plate 4 may correspond to the opposing surface 22 of the beam 2, and the reinforcing plate 4 may be arranged over the entire opposing surface 22, as shown in Figure 12(a), an exploded view similar to Figure 2. In this case, the design of the wooden beam 1 is improved when viewed from above. The reinforcing plate 4 and both beams 2 are bonded and fixed with an adhesive (not shown). To transmit shear forces between the beams 2 and the reinforcing plate 4, a shear force transmission mechanism 7 such as the duvet shown in Figure 10(a) or the drift pin shown in Figure 10(c) can be provided. Wooden plugs can be used instead of drift pins, reducing the weight of the wooden beam 1 while maintaining the design of the side surfaces of the wooden beam 1.

[0048] 12(b), the above-mentioned wooden reinforcing plate 4 may be further provided on the side opposite to the opposing surface 22 of each beam 2, and as shown in Fig. 12(c), the above-mentioned wooden reinforcing plate 4 may be provided on both sides of the beam 2 in the beam axis direction to form a wooden beam. Note that the configurations of Figs. 12(a) to (c) are also applicable to cases where the reinforcing plate 4 is a steel plate.

[0049] 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]

[0050] 1, 100: Wooden beam 2: Beam material 3: Concrete slab 4: Reinforcement plate 5, 5a-5d, 7, 7a: Shear force transmission mechanism 8: Reinforcing pipe 9: Fireproof coating 10: Reinforcement structure 21, 25, 101: Through holes 22: Opposite surface 23: Recess 41: Hole 102: Crack

Claims

1. A reinforcement structure for wooden beams, The wooden beam is formed by stacking a plurality of beam materials in the beam width direction so that opposing surfaces, which are side surfaces in the beam axis direction of the beam materials, face each other, The beam material has a through hole penetrating in the beam width direction, A reinforcing structure characterized in that a reinforcing plate having holes at locations corresponding to the through holes is arranged between opposing surfaces of the multiple beam materials.

2. 2. The reinforcing structure according to claim 1, wherein the reinforcing plate is a steel member.

3. 2. The reinforcing structure according to claim 1, wherein the reinforcing plate is a wooden member, and the shear strength and bending strength of the wooden material used for the reinforcing plate are higher than those of the wooden material used for the beam material.

4. A recess for accommodating the reinforcing plate is provided on the opposing surface of at least one of the beam members, The opposing surfaces of the plurality of beam members are in contact with each other at locations different from the recesses, 2. The reinforcement structure according to claim 1, wherein a first shear force transmission mechanism for transmitting shear force between the plurality of beam members is provided at the location.

5. 2. The reinforced structure according to claim 1, further comprising a second shear force transmission mechanism for transmitting shear force between the beam and the reinforcing plate.

6. 2. The reinforcing structure according to claim 1, wherein the reinforcing plates are arranged so as to cover four positions inclined at 45 degrees from the center of the through hole with respect to the beam axis.

7. The through hole further includes a cylindrical reinforcing tube provided along a circumferential direction thereof, 2. The reinforcing structure according to claim 1, wherein the reinforcing plate is attached to the outer surface of the reinforcing tube.

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