Reinforcement structure

Abstract

A reinforcement structure capable of reinforcing a wooden beam having a through hole with a simple configuration is provided. [Solution] 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 of the beam materials 2 in the beam axis direction, face each other. The reinforcing structure 10 reinforces the beam materials 2 of the wooden beam 1 with a reinforcing plate 4. The beam materials 2 have through holes 21 that penetrate in the beam width direction, and a reinforcing plate 4 having holes 41 at locations corresponding to the through holes 21 is arranged between the opposing surfaces 22 of the multiple beam materials 2.

Description

[Technical field]

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

[0002] In recent years, the use of wooden materials as building beams has been on the rise. Drilling holes in such wooden beams to allow equipment piping and other items to pass through has the advantage of making effective use of the space above the ceiling and reducing the floor height.

[0003] However, drilling through holes in wooden beams is expected to reduce the strength of the beams. Therefore, Patent Document 1 discloses a reinforcing 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 is time-consuming to manufacture. In addition, the steel plates need to be inserted into the slits, which limits the shape and arrangement of the steel plates.

[0006] The present invention has been made in consideration of the above problems, and has an object 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] To achieve the above-mentioned objectives 1.The invention is a reinforcing structure for a wooden beam, the wooden beam being formed by stacking a plurality of beam materials in the beam width direction so that the opposing surfaces, which are the side surfaces of the beam materials in the beam axis direction, face each other. The beam materials have through holes penetrating in the beam width direction. A reinforcing plate having holes at locations corresponding to the through holes is disposed between the opposing surfaces of the plurality of beam materials. The wooden beam further includes a cylindrical reinforcing tube provided along the circumferential direction of the through hole, and a wood material of the wooden beam is interposed between an axial end of the reinforcing tube and an end of the wooden beam. This is a reinforcing structure characterized by the above. The second invention is a reinforcing structure for a wooden beam, which is formed by stacking a number of 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, the beam materials have through holes that penetrate 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, the reinforcing plate is a wooden member, and the shear strength and bending strength of the wood material used for the reinforcing plate are higher than those of the wood material used for the beam materials. The third invention is a reinforcing structure for a wooden beam, which is formed by stacking a number of 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, the beam materials have through holes that penetrate 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, and the reinforcing plate is one or two plate materials that are X-shaped in side view and are arranged to cover four directions inclined at 45° from the center of the through hole to the beam axis direction.

[0008] No. 1-3 In the present invention, a reinforcing plate having holes at locations corresponding to the through holes of the beam materials is placed between the opposing surfaces of the multiple beam materials that make up the wooden beam. This allows the wooden beam to be reinforced with a simple structure. In addition, since the reinforcing plate can be placed between the beam materials, construction can be easily performed, and there are no limitations on the shape or placement of the reinforcing plate.

[0009] The second invention When the reinforcing plate is made of wood, a structure that uses a lot of wood boards and is excellent in terms of the environment can be realized. In addition, 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. In addition, in the third invention, the reinforcing plate is arranged to cover four positions inclined at 45° from the center of the through hole to the beam axis direction, so that the reinforcing plate can reinforce areas around the through hole in the beam material that are likely to become crack starting points, thereby efficiently preventing the occurrence and progression of cracks.

[0010] A recess for accommodating the reinforcing plate may be provided on the opposing surface of at least any of the beam materials, and the opposing surfaces of the multiple beam materials 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 beam materials 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 the shear force to be transmitted between the beam and the reinforcing plate, integrating the beam and the reinforcing plate.

[0012] The reinforcing plate is, for example, a steel member. When the reinforcing plate is made of steel, it can be easily processed according to the purpose of reinforcement and the targeted reinforcement performance, making it possible to provide efficient reinforcement. Effect of the Invention

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

[0015] [Figure 1] FIG. 1 shows a wooden beam 1. [Diagram 2] FIG. 2 is an exploded perspective view showing the beam 2 and the reinforcing plate 4. [Diagram 3] A diagram showing a recess 23 of a beam material 2 and a shear force transmission mechanism 5. [Figure 4] FIG. 2 is a diagram showing shear force transmission mechanisms 5a to 5d. [Diagram 5] 4 shows an example of the shape of the reinforcing plate 4. [Figure 6] An example of an X-shaped reinforcing plate 4. [Figure 7] FIG. 1 is a schematic diagram of a wooden beam 100. [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 the shear force transmission mechanisms 7 and 7a. [Figure 11] FIG. [Figure 12] 4A to 4C are diagrams showing examples of the arrangement of a reinforcing plate 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 is a diagram showing a wooden beam 1 having a reinforcing 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 laminated timber with the fiber direction in the beam axis direction, but is not limited to this. 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 Fig. 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 Fig. 1(a) and the left-right direction of Fig. 1(b).

[0021] The beam material 2 has a through hole 21. The through hole 21 is provided so as to penetrate the beam material 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 material 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 the two beam materials 2 in the beam axis direction and beam depth direction correspond to each other.

[0022] 2 is an exploded perspective view of the beam material 2 and reinforcing plate 4 of the wooden beam 1. The reinforcing plate 4 is a rectangular steel member (steel plate) having a hole 41, and is sandwiched between the opposing surfaces 22 of both beam materials 2 of the wooden beam 1 and fixed to both beam materials 2 with an adhesive (not shown) or the like. A normal flat steel plate can be used as the reinforcing plate 4. The hole 41 is a circular hole having approximately the same diameter as the through hole 21, and is located at a position corresponding to the through hole 21 of the beam material 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 range 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 range where most damage was observed in the results of previous research. However, the thickness and length and width of the steel plate are not limited to this. Also, in addition to normal steel plate, checkered steel plate, punched metal, etc. can be used as the reinforcing plate 4.

[0024] As described above, in the reinforcement structure 10 of this embodiment, the reinforcing plate 4 having holes 41 at locations corresponding to the through holes 21 of the beam materials 2 is disposed between the opposing surfaces 22 of the beam materials 2 constituting the wooden beam 1. This allows the wooden beam 1 to be reinforced with a simple configuration. In addition, since the reinforcing plate 4 can be sandwiched and disposed between the beam materials 2, construction can be easily performed. Reinforcement using the reinforcing plate 4 allows the hole diameter of the through holes 21 relative to the beam depth of the wooden beam 1 to be increased, and the hurdle of forming the through holes 21, etc. in the wooden beam 1 is also lowered. As a result, the degree of freedom in arranging equipment piping, etc. is improved, and it is possible to reduce the floor height of a building and effectively utilize the space above the ceiling.

[0025] In addition, in this embodiment, by using a steel plate as the reinforcing plate 4, processing according to the purpose of reinforcement and the targeted 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 is generated between the beams 2 by the thickness of the reinforcing plate 4, which may cause a problem in terms of design when looking up at the wooden beam 1. In response to this, as shown in Fig. 3(a), which is a cross section similar to Fig. 1(b), a recess 23 for accommodating the reinforcing plate 4 is provided by seat carving on the opposing surfaces 22 of both beams 2 of the wooden beam 1, so that the opposing surfaces 22 of the beams 2 come into contact with each other except for the recess 23, and the reinforcing plate 4 can be accommodated inside the wooden beam 1. This improves the design of the wooden beam 1.

[0027] In the example of FIG. 3(a), the recesses 23 are provided on the opposing surfaces 22 of both beams 2, but as shown in FIG. 3(b), the recesses 23 may be provided only on the opposing surface 22 of one beam 2 (the beam 2 on the right side in the example of the figure). In the example of FIG. 3(b), a shear force transmission mechanism 5 (first shear force transmission mechanism) that transmits shear force at the contact point of the opposing surfaces 22 of both beams 2 is further provided. This allows the shear force to be transmitted between the beams 2, and the beams 2 can be integrated together. A similar shear force transmission mechanism 5 can be provided in the example of FIG. 3(a), but in the case of FIG. 3(b), the reinforcing effect of the reinforcing plate 4 in the recesses 23 can be transmitted to the beam 2 that does not have the recesses 23 (the beam 2 on the left side in the example of the figure), which is preferable.

[0028] The shear force transmission mechanism 5 in Fig. 3(b) is a pin provided so as to straddle the opposing surfaces 22 of both beam materials 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 passed through through holes 25 in the beam width direction of both beam materials 2 as the shear force transmission mechanism 5a. In this case, in order to prevent the drift pin, which is a steel material, from being exposed on the side surface of the wooden beam 1 (the side surface opposite to the opposing surface 22 of the beam material 2) and becoming a thermal bridge, it is also desirable to shorten the drift pin slightly and block the end of the through hole 25 of each beam material 2 on the side surface of the wooden beam 1 with a wooden plug or the like.

[0029] In addition, as shown in FIG. 4(b), a screw can be driven across both beams 2 as a shear force transmission mechanism 5b, and as shown in FIG. 4(c) as a shear force transmission mechanism 5c, a steel plate with protrusions on both sides can be placed between the beams 2, and the protrusions on both sides of the steel plate can be inserted into both beams 2. As the steel plate, a metal plate connector can be used in which the backs (sides without protrusions) are joined together by welding or the like. Also, as shown in FIG. 4(d) as a shear force transmission mechanism 5d, a cylindrical steel member, a dug-in dowel, can be used, and both ends in the axial direction can be inserted into both beams 2. As the dug-in dowel, a shear plate or a split ring can be used. In addition, the shear force can be transmitted simply by bonding the opposing surfaces 22 of both beams 2 together with an adhesive (not shown).

[0030] In this embodiment, the wooden beam 1 is formed by stacking two beams 2, but the wooden beam may be formed by stacking three or more beams 2 in the same manner. 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] In addition, since the reinforcing plate 4 can be sandwiched between the beams 2, the shape and arrangement of the reinforcing plate 4 are not limited as in the above-mentioned Patent Document 1. 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 FIG. 1(a) and FIG. 5(a), the reinforcing plate 4 is rectangular, which has the advantage that the reinforcing plate 4 can be easily processed and the strength can be improved. On the other hand, the reinforcing plate 4 can be disc-shaped as shown in FIG. 5(b), which allows the above-mentioned range R (see FIG. 2) to be covered with a steel plate of a minimum area. However, processing is slightly more difficult than with the reinforcing plate 4 of a rectangular shape.

[0032] 6(a), the reinforcing plate 4 may be an X-shaped plate. That is, as shown in FIG. 7, the stress generated around the through hole 101 of the wooden beam 100 due to a vertical load or the like is large at a position in a direction a inclined at about 45° from the center C of the through hole 101 to the beam axis direction H on the side surface of the wooden beam 100 in the beam axis direction, and it is known that there is a high possibility that a crack (split) 102 in the beam axis direction will occur in the wooden beam 100 starting from that position ("Study on the strength of laminated timber beams with circular holes" Okamoto et al., Proceedings of the Architectural Institute of Japan, Structural Engineering Journal, Vol. 85, No. 775, 1199-1208, September 2020).

[0033] The X-shaped reinforcing plate 4 shown in Fig. 6(a) is arranged so as to cover the positions along four directions a1 to a4 inclined at approximately 45° from the center C of the through hole 21 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 positions, but the X-shaped reinforcing plate 4 is preferable in that it is arranged so as to cover the above positions more widely.

[0034] As shown in Fig. 6(b), the upper end of the reinforcing plate 4 may be made to protrude from the upper surface of the wooden beam 1 and embedded in the concrete slab 3 on the upper surface 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] In addition, 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 material 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 in the opposing surfaces 22 of both beam materials 2. Although the weight increases by using two reinforcing plates 4, the processing of the reinforcing plate 4 is easier than that of an X-shaped reinforcing plate 4. In addition, it is also preferable that both beam materials 2 can be reinforced with individual steel plates.

[0036] Alternatively, as shown in Fig. 9, which is a cross section similar to Fig. 1(b), reinforcing plates 4 arranged in recesses 23 on the opposing surfaces 22 of both beam materials 2 constituting a wooden beam 1 may be fixed to the beam materials 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, and the beam 2 and the reinforcing plate 4 to be integrated together. The shear force transmission mechanism 7 in FIG. 10(a) is a shear plate, split ring, or other digging 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 Fig. 10(b), bolts 71 may be provided that pass through the inside of the duvet and penetrate both beams 2 and the reinforcing plate 4 in the beam width direction, so that the shear force applied to the duvet can be transmitted to a wide range in the beam width direction of the beam 2 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 Fig. 10(b) and be covered with a covering material (not shown), or may be housed in a recess formed in the side surface (side surface of the wooden beam 1) opposite the opposing surface 22 of the beam 2, and the recess may be filled with a wooden hole-filling material. This allows the side surface of the wooden beam 1 to be smoothed.

[0039] Also, as shown in Fig. 10(c), a drift pin can be used as the shear force transmission mechanism 7a. The drift pin is passed through a through hole 25 formed in the beam material 2 in the beam width direction, and penetrates both beam materials 2 and the reinforcing plate 4 in the beam width direction. As described above, in order to prevent the drift pin from being exposed on the side surface of the wooden beam 1 and becoming a thermal bridge, it is desirable to shorten the drift pin slightly and plug the end of the through hole 25 on the side surface side of the wooden beam 1 with a wooden plug or the like. Also, the bolt 71 in Fig. 10(b) can be used alone as the shear force transmission mechanism.

[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 to transmit the shear force between the reinforcing plate 4 and the beams 2. Also, the 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 is, for example, a steel tube, and is placed 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 be integrated. 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 tube 8 are wrapped around the wooden material of the beam 2, and the wooden material can be used 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 tube 8 may be exposed to the sides of the wooden beam 1 and not covered by the wooden material, as shown in Fig. 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 arranged along the inner surface of the reinforcing pipe 8, and is made of wood or the like impregnated with a flame retardant. Alternatively, a wooden pipe that does not have flame retardant properties may be arranged inside the reinforcing pipe 8. In this case, the wooden pipe is considered as a fuel for fire.

[0044] The reinforcing tube 8 in Figs. 11(a) and (b) is arranged along the inner surface of the through hole 21, but as shown in Fig. 11(c), the reinforcing tube 8 may be arranged set back from the inner surface of the through hole 21 into the inside of the beam material 2. A groove 26 for inserting the reinforcing tube 8 is provided in each beam material 2. By inserting the reinforcing tube 8 into the groove 26 of each beam material 2, it is possible to prevent the beam materials 2 from being misaligned with each other. Note that the reinforcing tube 8 is not limited to being cylindrical. For example, the cross section of the reinforcing tube 8 may be rectangular, and it may be arranged in a diamond shape as in Fig. 5(a).

[0045] In this embodiment, the reinforcing plate 4 is a steel member, but it can also be a wooden member, and a lightweight frame that uses a lot of wood and is environmentally friendly and aesthetically pleasing can be provided. The reinforcing plate 4 and the beams 2 are the same type of member, so they have good compatibility, and the reinforcing plate 4 and the beams 2 can be processed in the same factory, improving workability. As the reinforcing plate 4, plywood, LVL (Class A structural LVL, Class B structural LVL), CLT, OSB (Oriented Strand Board), LSL (Laminated Strand Lumber), etc. can be used. In particular, Class B structural LVL is preferable because the veneer with the fibers perpendicular to the direction (orthogonal veneer) contributes to reinforcement. However, in the example of FIG. 6(b) in which the upper end of the reinforcing plate 4 is used as a shear connector, the reinforcing plate 4 is a steel plate.

[0046] When the reinforcing plate 4 is a wooden member, it is desirable that the shear strength and bending strength of the wooden material used for the reinforcing plate 4 be higher than that of the wooden material used for the beam 2. This allows 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 wooden 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 as to obtain an appropriate reinforcing effect. 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, as shown in FIG. 12(a), which is an exploded view similar to FIG. 2, the shape of the reinforcing plate 4 may correspond to the opposing surface 22 of the beam material 2, and the reinforcing plate 4 may be arranged over the entire opposing surface 22. In this case, the design of the wooden beam 1 is improved when looking up at it. The reinforcing plate 4 and both beam materials 2 are bonded and fixed with an adhesive (not shown), but a shear force transmission mechanism 7 such as a duvet in FIG. 10(a) or a drift pin in FIG. 10(c) may be provided to transmit a shear force between the beam material 2 and the reinforcing plate 4. A wooden plug may be used instead of the drift pin, which reduces the weight of the wooden beam 1 while maintaining the design of the side of the wooden beam 1.

[0048] As shown in Fig. 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 material 2, and as shown in Fig. 12(c), the above-mentioned wooden reinforcing plate 4 may be provided on both sides in the beam axis direction of the beam material 2 to form a wooden beam. Note that the configurations in Figs. 12(a) to (c) are also applicable to the case where the reinforcing plate 4 is a steel plate.

[0049] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to the above examples. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the technical ideas disclosed in this application, and it is understood that these also naturally belong to 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 tube 9: Fireproof coating 10: Reinforcement structure 21, 25, 101: Through holes 22: Opposing surface 23: Recess 41: Hole 102: Crack

Claims

1. A reinforcing structure for a wooden beam, The wooden beam is formed by stacking a plurality of beam materials in a beam width direction so that opposing surfaces, which are side surfaces in a 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 plate having holes at locations corresponding to the through holes is disposed between the opposing surfaces of the beam members, The through hole further includes a cylindrical reinforcing tube provided along a circumferential direction of the through hole, A reinforcing structure, characterized in that a wooden material of the wooden beam is interposed between the axial end of the reinforcing pipe and the end of the wooden beam.

2. A reinforcing structure for a wooden beam, comprising: The wooden beam is formed by stacking a plurality of beam materials in a beam width direction so that opposing surfaces, which are side surfaces in a 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 plate having holes at locations corresponding to the through holes is disposed between the opposing surfaces of the beam members, A reinforcing structure characterized in that 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.

3. A reinforcing structure for a wooden beam, comprising: The wooden beam is formed by stacking a plurality of beam materials in a beam width direction so that opposing surfaces, which are side surfaces in a 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 plate having holes at locations corresponding to the through holes is disposed between the opposing surfaces of the beam members, A reinforcing structure characterized in that the reinforcing plate is one or two plate members that are X-shaped in side view and are arranged to cover four directions inclined at 45° from the center of the through hole with respect to the beam axis direction.

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, 4. The reinforcing structure according to claim 1, further comprising a first shear force transmission mechanism for transmitting shear force between the beam members at said location.

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

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

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