WO2021049312A1

WO2021049312A1 - Clt panel reinforcing structure

Info

Publication number: WO2021049312A1
Application number: PCT/JP2020/032384
Authority: WO
Inventors: 治田畑
Original assignee: 積水ハウス株式会社
Priority date: 2019-09-11
Filing date: 2020-08-27
Publication date: 2021-03-18
Also published as: JP2021042589A; AU2020344316A1; US20220275644A1; GB2602409A; JP7272194B2; GB2602409B; GB202203479D0

Abstract

[Problem] To provide a means for efficiently reinforcing the strength around a through hole in a CLT panel. [Solution] A CLT panel reinforcing structure 10 comprises: a CLT panel 20 that has a through hole 21; a first reinforcing member 30 that comprises a first pipe 32 and a first plate 31 having a first opening 31A; and a second reinforcing member 40 that comprises a second pipe 42 and a second plate 41 having a second opening 41A. The first reinforcing member 30 is configured such that the first pipe 32 is inserted into the through hole 21 in a state in which the outer circumferential face 32A of the first pipe 32 is in contact with the inner circumferential face 21A of the through hole 21, and a maximum face 31B of the first plate 31 is in contact with a first face 22 of the CLT panel 20. The second reinforcing member 40 is configured such that the second pipe 42 is inserted into the through hole 21 in a state in which the outer circumferential face 42A of the second pipe 42 is in contact with the inner circumferential face 32B of the first pipe 32, and a maximum face 41B of the second plate 41 is in contact with the second face 23 of the CLT panel 20 located opposite to the first face 22.　

Description

CLT panel reinforcement structure

The present invention relates to a reinforcing structure around a through hole of a CLT panel.

Patent Document 1 discloses a reinforcing structure of a beam made of a wooden square timber provided with an insertion hole. The reinforcing structure includes a pair of reinforcing pieces screwed around the insertion hole on both sides of the beam and a reinforcing pipe fitted into the insertion hole.

Japanese Unexamined Patent Publication No. 2003-176601

CLT panels may be used in buildings such as houses. For example, when a CLT panel is used as a wall of a building, through holes for passing pipes and wiring are formed in the CLT panel. When a through hole is formed in the CLT panel, the yield strength of the CLT panel decreases around the through hole.

In the reinforcing structure described in Patent Document 1, the reinforcing pieces are fixed to the surface of the beam by a large number of screws, so that the strength against shearing force is reinforced around the insertion hole of the beam. However, when the reinforcing structure described in Patent Document 1 is applied around the through holes of the CLT panel and a large number of screws are screwed into the CLT panel, the fibers of the wooden board constituting the CLT panel are cut by each screw. On the contrary, there is a risk of reducing the strength of the CLT panel.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a means for efficiently reinforcing the strength around a through hole of a CLT panel.

(1) The CLT panel reinforcing structure according to the present invention has a CLT panel having a through hole, a first plate having a first opening, a first reinforcing material having a first pipe, and a second opening. It includes two plates and a second reinforcing material with a second tube. The first pipe extends from the first region including the first opening of the first plate in a direction intersecting the maximum surface of the first plate. The second pipe extends from a second region including the second opening of the second plate in a direction intersecting the maximum surface of the second plate. In the first reinforcing material, the first pipe is inserted into the through hole in a state where the outer peripheral surface of the first pipe is in contact with the inner peripheral surface of the through hole, and the maximum surface of the first plate. Is in contact with the first surface of the CLT panel. In the second reinforcing material, the second pipe is inserted into the through hole in a state where the outer peripheral surface of the second pipe is in contact with the inner peripheral surface of the first pipe, and the maximum of the second plate is The surface is in contact with the second surface of the CLT panel, which is located opposite to the first surface.

At the connection point between the first pipe and the first plate, the cross-sectional area along the maximum surface of the first plate is wider than the cross-sectional area of only the first pipe, so that the yield strength against the compressive force at the connection point is increased by the first pipe. Greater than the bearing capacity of only. At the connection point between the second pipe and the second plate, the yield strength is similarly increased. Similarly, at the place where the outer peripheral surface of the second pipe and the outer peripheral surface of the first pipe are in contact with each other, the proof stress is larger than the proof stress of only the first pipe or the proof stress of only the second pipe. As a result, the proof stress near the through hole of the CLT panel can be efficiently reinforced.

(2) Preferably, the first tube extends to the second plate, and the second tube extends to the first plate.

Since the first pipe and the second pipe overlap over the entire area of the through hole of the CLT panel, the yield strength in the vicinity of the through hole of the CLT panel can be reinforced more efficiently.

(3) Preferably, the first region is the peripheral edge of the first opening, and the second region is the peripheral edge of the second opening.

The first plate is suppressed from protruding into the opening from the opening end of the first pipe, and the second plate is suppressed from protruding into the opening from the opening end of the second pipe.

(4) Preferably, the first plate and the second plate are adhered to the CLT panel with an adhesive.

No screws are required to fix the first plate and the second plate to the CLT panel, or the number of screws used can be reduced as much as possible, so that the wood fibers of the CLT panel are suppressed from being cut by the screws. ..

(5) Preferably, the first plate, the first tube, the second plate, and the second tube are each made of metal.

(6) The above CLT panel forms the wall of the building.

According to the present invention, the strength around the through hole of the CLT panel can be efficiently reinforced.

FIG. 1 is a perspective view of the CLT panel reinforcing structure 10 according to the embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3A is a front view of the maximum surface 31B of the first plate 31 showing the peripheral edge 34 according to the embodiment, and FIG. 3B is the maximum of the second plate 41 showing the peripheral edge 44 according to the embodiment. It is a front view of the surface 41B. FIG. 4A is an exploded perspective view of the first reinforcing member 30 and the second reinforcing member 40, and FIG. 4B is a sectional view taken along line IVB-IVB of the first reinforcing member 30 in FIG. FIG. 5 is a cross-sectional view of the CLT panel reinforcing structure 100 showing a state in which the tip 32C is not around the open end of the through hole 21. FIG. 6 is a cross-sectional view of the CLT panel reinforcing structure 100 showing the first plate 131 and the second plate 141 according to the modified example.

Hereinafter, embodiments of the present invention will be described. It goes without saying that the embodiments described below are merely examples of the present invention, and the embodiments of the present invention can be appropriately changed without changing the gist of the present invention. Further, in the following description, the vertical direction 7 is defined with reference to the state in which the CLT panel reinforcing structure 10 is usably installed (the state in FIG. 1), and the CLT panel 20 extends in the vertical direction. The longitudinal direction 11 is defined as the direction orthogonal to 7, and the width direction 12 is defined as the thickness direction of the CLT panel 20 and the direction orthogonal to both the vertical direction 7 and the longitudinal direction 11.

The CLT panel reinforcing structure 10 of this embodiment is shown in FIGS. 1 and 2. The CLT panel reinforcing structure 10 is used as a bearing wall in a house or a condominium. In addition, CLT is an abbreviation for Cross Laminated Timber, and is the same in the following.

The CLT panel reinforcing structure 10 includes a CLT panel 20, a first reinforcing member 30, a second reinforcing member 40, and a screw 50.

[CLT panel 20]
The CLT panel 20 forms a wall of a building such as a house or an apartment. The CLT panel 20 is a flat plate formed by laminating and adhering the fibers of a wooden board such as a sawn board so that the directions of fibers are orthogonal to each other in each layer. The size of the CLT panel 20 is not particularly limited, but is, for example, a flat plate shape having a vertical length of 3000 mm, a horizontal length of 2000 mm, and a thickness of 90 mm. As shown in FIG. 1, the CLT panel 20 has a first surface 22 and a second surface 23, which are the maximum surfaces and have a front-to-back relationship.

As shown in FIGS. 1 and 2, the CLT panel 20 has a through hole 21 extending along the width direction 12. Piping (not shown) and wiring (not shown) are passed through the through hole 21. The through hole 21 is not particularly limited, but has, for example, a cylindrical shape having a diameter of about 110 mm. The through hole 21 is chamfered so that the open end on the first surface 22 side does not interfere with the connection portion 33 described in detail below. Further, the position where the through hole 21 is formed is not particularly limited, but it is preferable that the first reinforcing member 30 and the second reinforcing member 40 do not interfere with the floor or ceiling.

[First Reinforcing Material 30]
As shown in FIGS. 1 and 2, a part of the first reinforcing member 30 is inserted into the through hole 21 of the CLT panel 20 and fixed to the first surface 22 of the CLT panel 20. The first reinforcing member 30 includes a first plate 31 having a first opening 31A and a first pipe 32.

The first plate 31 is a quadrangular metal flat plate, and the first opening 31A is formed substantially in the center. The first plate 31 has

maximum surfaces

31B and 31C which are in a front-to-back relationship. The maximum surface 31B abuts on the first surface 22 of the CLT panel 20. The maximum surface 31C faces the same direction as the first surface 22 of the CLT panel 20. The maximum surface 31B and the first surface 22 are adhered to each other by an adhesive. The size of the first plate 31 is not particularly limited, but for example, when the diameter of the through hole 21 is about 110 mm, the vertical length and the horizontal length are each about 300 mm, and the thickness is about 3 mm. The diameter of the first opening 31A is, for example, about 110 mm, which is about the same as the diameter of the through hole 21.

The first pipe 32 extends from a part of the peripheral edge 34 of the first opening 31A of the first plate 31 in a direction orthogonal to the maximum surface 31B of the first plate 31 (an example of an intersecting direction). As shown in FIG. 3A, the peripheral edge 34 has the same center as the center of the first opening 31A and at least the diameter of the first opening 31A from the boundary with the first opening 31A of the maximum surface 31B. Refers to the area up to the boundary represented by a circle that is 1.25 times the diameter. In the present embodiment, the first pipe 32 extends from the boundary of the peripheral edge 34 with the first opening 31A. The peripheral edge 34 and the first opening 31A are examples of the first region.

The first tube 32 is a metal circular tube. The first pipe 32 is joined to the first plate 31 by welding the outer peripheral surface 32A to the first opening 31A. Welded metal is filled or laminated between the outer peripheral surface 32A and the maximum surface 31B at the connection portion 33. The outer diameter of the first pipe 32 is about the same as the diameter of the through hole 21. The dimension of the first tube 32 protruding from the maximum surface 31B of the first plate 31 is equivalent to the thickness of the CLT panel 20 in the present embodiment and is 90 mm. When there is weld metal at the connection portion 43 on the outer periphery of the second pipe 42 of the second plate 41 as in the present embodiment, the first pipe 32 may extend to the connection portion 43 and is not necessarily a CLT panel. It does not have to protrude to the same thickness as 20.

[Second reinforcing material 40]
As shown in FIGS. 1 and 2, a part of the second reinforcing member 40 is inserted into the first pipe 32 and fixed to the second surface 23 of the CLT panel 20. As shown in FIG. 4A, the second reinforcing member 40 includes a second plate 41 having a second opening 41A and a second pipe 42.

The second plate 41 is a quadrangular metal flat plate, and a second opening 41A is formed substantially in the center. The second plate 41 has

maximum surfaces

41B and 41C which are in a front-to-back relationship. The maximum surface 41B abuts on the second surface 23 of the CLT panel 20. The maximum surface 41C faces the same direction as the second surface 23 of the CLT panel 20. The maximum surface 41B and the second surface 23 are adhered to each other by an adhesive. The size of the second plate 41 is not particularly limited, but is, for example, the same size as the first plate 31.

The second pipe 42 extends from a part of the peripheral edge 44 of the second opening 41A of the second plate 41 in a direction orthogonal to the maximum surface 41B of the second plate 41 (an example of an intersecting direction). As shown in FIG. 3B, the peripheral edge 44 has the same center as the center of the second opening 41A and at least the diameter of the second opening 41A from the boundary with the second opening 41A of the maximum surface 41B. Refers to the area up to the boundary represented by a circle that is 1.25 times the diameter. In the present embodiment, the second pipe 42 extends from the boundary of the peripheral edge 44 with the second opening 41A. The peripheral edge 44 and the second opening 41A are examples of the second region.

The second pipe 42 is a metal circular pipe. The second pipe 42 is joined to the second plate 41 by welding the outer peripheral surface 42A to the second opening 41A. Welded metal is filled or laminated between the outer peripheral surface 32A and the maximum surface 41B at the connection portion 43. The second pipe 42 extends to the first plate 31. The outer diameter of the second pipe 42 is about the same as the inner diameter of the first pipe 32. The outer peripheral surface 42A of the second pipe 42 inserted into the through hole 21 comes into contact with the inner peripheral surface 32B of the first pipe 32.

[Bis 50]
As shown in FIG. 1, the screw 50 is screwed into the CLT panel 20 from the outside of the first plate 31 and the second plate 41, and the first plate 31 is inserted into the first surface 22 of the CLT panel 20. The second plate 41 is temporarily fixed to the second surface 23 of the CLT panel 20. The positions of the screws 50 on the first plate 31 and the second plate 41 are not particularly limited, but are, for example, the four corners of the first plate 31 and the second plate 41. Although omitted in each drawing, the first plate 31 and the second plate 41 are formed with through holes for inserting the shaft portion of the screw 50.

[CLT panel reinforcement structure 10]
As shown in FIGS. 1 and 2, in the first reinforcing member 30, the first pipe 32 is inserted into the through hole 21 from the first surface 22 side of the CLT panel 20. The outer peripheral surface 32A of the first pipe 32 inserted into the through hole 21 comes into contact with the inner peripheral surface 21A of the through hole 21. An adhesive is applied to the maximum surface 31B of the first plate 31, and the first tube 32 is inserted into the through hole 21 until the maximum surface 31B abuts on the first surface 22 of the CLT panel 20. The maximum surface 31B of 1 plate 31 and the first surface 22 of the CLT panel 20 are adhered by an adhesive. If necessary, the screw 50 is inserted into the through hole of the first plate 31 and driven into the CLT panel 20 until the adhesive is cured.

As shown in FIGS. 1 and 2, in the second reinforcing member 40, the second pipe 42 is inserted into the through hole 21 from the second surface 23 side of the CLT panel 20. Since the first pipe 32 has already been inserted into the through hole 21, the outer peripheral surface 42A of the second pipe 42 inserted into the through hole 21 comes into contact with the inner peripheral surface 32B of the first pipe 32. An adhesive is applied to the maximum surface 41B of the second plate 41, and the second pipe 42 is inserted into the through hole 21 until the maximum surface 41B abuts on the second surface 23 of the CLT panel 20. The maximum surface 41B of the 2 plate 41 and the second surface 23 of the CLT panel 20 are adhered by an adhesive. If necessary, the screw 50 is inserted into the through hole of the second plate 41 and driven into the CLT panel 20 until the adhesive is cured.

[Action and effect of the embodiment]
As shown in FIG. 4B, at the connection point 33 between the first pipe 32 and the first plate 31, the cross-sectional area along the maximum surface 31B of the first plate 31 is larger than the cross-sectional area of only the first pipe 32. Will also be wider. As a result, the proof stress of the first reinforcing member 30 against the compressive force P at the connection portion 33 becomes larger than the proof stress of only the first pipe 32. Similarly, at the connection point 43 between the second pipe 42 and the second plate 41, the proof stress of the second reinforcing member 40 against the compressive force P at the connection point 43 is larger than the proof stress of the second pipe 42 alone.

Further, as shown in FIG. 2, at the portion 51 where the outer peripheral surface 42A of the second pipe 42 and the outer peripheral surface 32A of the first pipe 32 come into contact with each other, similarly, the yield strength of only the first pipe 32 or the second The yield strength of the first pipe 32 and the second pipe 42 is larger than the yield strength of the pipe 42 alone. As a result, the proof stress in the vicinity of the through hole 21 of the CLT panel 20 can be efficiently reinforced by the first reinforcing member 30 and the second reinforcing member 40.

Further, since the first pipe 32 and the second pipe 42 overlap in the entire width direction 12 of the through hole 21 of the CLT panel 20, the proof stress in the vicinity of the through hole 21 of the CLT panel 20 is further efficiently reinforced. To.

Further, the diameter of the first opening 31A and the diameter of the through hole 21 are made to be about the same, and the diameter of the second opening 41A and the inner diameter of the first pipe 32 are made to be about the same, so that the first plate 31 becomes the first pipe. The second plate 41 does not protrude into the opening from the opening end of 32, and the second plate 41 does not protrude into the opening from the opening end of the second pipe 42.

Further, the first plate 31 and the second plate 41 are fixed to the CLT panel 20 by an adhesive. Reinforcement of the CLT panel 20 in the vicinity of the through hole 21 by the first reinforcing member 30 and the second reinforcing member 40 is realized by fixing the first plate 31 and the second plate 41 to the CLT panel 20 by screws 50. Instead, as described above, it is realized by increasing the yield strength due to the increase in the cross-sectional area of the first reinforcing member 30 and the second reinforcing member 40 at the connecting

points

33, 43 and 51. Therefore, since the number of screws 50 used for fixing the first plate 31 and the second plate 41 to the CLT panel 20 can be reduced as much as possible, it is possible to prevent the wood fibers of the CLT panel 20 from being cut by the screws 50. ..

[Modification example]
In the above embodiment, as shown in FIG. 2, in the first pipe 32, the first pipe 32 extends to the second plate 41 and the tip 32C is located near the second opening 41A, but is shown in FIG. The tip 32C does not have to be located near the second opening 41A. At this time, if the portion 51 where the outer peripheral surface 42A of the second pipe 42 and the outer peripheral surface 32A of the first pipe 32 are in contact with each other is provided, the second pipe 42 does not have to extend to the first plate 31. Even with such a configuration, the proof stress in the vicinity of the through hole 21 is realized by increasing the cross-sectional area of the first reinforcing member 30 and the second reinforcing member 40 at the connection points 33, 43 and 51.

Further, at the connection point 43, the weld metal may be laminated on the maximum surface 41C, and the tip 32C may abut on the maximum surface 41B. As a result, the first pipe 32 and the second pipe 42 overlap each other without a gap in the entire width direction 12 of the through hole 21 of the CLT panel 20, so that the proof stress in the vicinity of the through hole 21 of the CLT panel 20 is more efficient. Is reinforced. In the first pipe 32, the tip 32C in contact with the second plate 41 may be adhered to the maximum surface 41B of the second plate 41 with an adhesive.

Further, the diameter of the first opening 31A does not have to be about the same as the diameter of the through hole 21, and for example, as shown in FIG. 6, the diameter of the first opening 131A is shorter than the inner diameter of the first pipe 32. Plate 131 may be used. The diameter of the first opening 131A is at least 50% or more of the inner diameter of the first pipe 32, and preferably 80% or more of the inner diameter of the first pipe 32. In the example shown in FIG. 6, the diameter of the first opening 131A is 80% of the inner diameter of the first pipe 32.

The first pipe 32 extends from a part of the peripheral edge 134 of the first opening 131A of the first plate 131. When the diameter of the first opening 131A is 50% of the inner diameter of the first pipe 32, the peripheral edge 134 has the same center and center as, for example, the center of the first opening 131A from the boundary with the first opening 131A of the maximum surface 131B. It refers to the area up to the boundary represented by a circle, which has a diameter about twice the diameter of the first opening 131A. At this time, the first plate 131 is joined to the first pipe 32 by welding the maximum surface 131B to the end face of the first pipe 32. Even with such a configuration, it is possible to prevent the first plate 131 from protruding into the opening from the opening end of the first pipe 32. The peripheral edge 134 and the first opening 131A are examples of the first region.

Further, the diameter of the second opening 41A does not have to be about the same as the inner diameter of the first pipe 32. For example, as shown in FIG. 6, the diameter of the second opening 141A is shorter than the inner diameter of the second pipe 42. Two plates 141 may be used. The diameter of the second opening 141A is at least 50% or more of the inner diameter of the second pipe 42, and preferably 80% or more of the inner diameter of the second pipe 42. In the example shown in FIG. 6, the diameter of the second opening 141A is 80% of the inner diameter of the second pipe 42.

The second pipe 42 extends from a part of the peripheral edge 144 of the second opening 141A of the second plate 141. When the diameter of the second opening 141A is 50% of the inner diameter of the second pipe 42, the peripheral edge 144 has the same center and center as, for example, the center of the second opening 141A from the boundary with the second opening 141A of the maximum surface 141B. It refers to the area up to the boundary represented by a circle, which has a diameter about twice the diameter of the second opening 141A. At this time, the second plate 141 is joined to the second pipe 42 by welding the maximum surface 141B to the end face of the second pipe 42. Even with such a configuration, it is possible to prevent the second plate 141 from protruding into the opening from the opening end of the second pipe 42. The peripheral edge 144 and the second opening 141A are examples of the second region.

Further, the screw 50 may not be required for fixing the first plate 31 and the second plate 41 to the CLT panel 20. As a result, the wood fibers of the CLT panel 20 are not cut by the screw 50.

Further, in the above embodiment, since there is one through hole 21, one tube is provided in each of the

plates

31 and 41. However, when the CLT panel 20 has a plurality of through holes 21, each plate is provided with one tube. A plurality of tubes may be provided.

At the connection point 33, the weld metal may be laminated on the maximum surface 31C. At this time, the through hole 21 does not have to be chamfered at the open end on the first surface 22 side.

Further, the position where the first plate 31 is welded to the outer peripheral surface 32A does not have to be the end along the width direction 12 of the first pipe 32.

Further, the position where the second plate 41 is welded to the outer peripheral surface 42A does not have to be the end along the width direction 12 of the second pipe 42.

Further, the second pipe 42 extends from the peripheral edge of the second opening 41A of the second plate 41 and extends along the width direction 12 to the first plate 31, but may extend beyond the first plate 31. .. Further, the second pipe 42 may be joined to the first reinforcing member by welding at a portion located at the first opening 31A. Further, the outer peripheral surface 42A of the second pipe 42 may be adhered to the inner peripheral surface 32B of the first pipe 32 with an adhesive.

Further, the first pipe 32 may extend from the outer region of the peripheral edge 34 surrounding the first opening 31A. Further, the second pipe 42 may extend from the outer region of the peripheral edge 44 surrounding the second opening 41A.

10 ... CLT panel reinforcing structure 20 ... CLT panel 21 ... Through hole 21A ... Inner peripheral surface 22 ... First surface 23 ... Second surface 30 ... First reinforcing material 31 ... First plate 31A ... First opening 31B ... Maximum surface 32 ... First pipe 32A ... Outer peripheral surface 32B ... Inner peripheral surface 34 ... Peripheral (in the first region) One case)
40 ... 2nd reinforcing material 41 ... 2nd plate 41A ... 2nd opening 41B ... maximum surface 42 ... 2nd pipe 42A ... outer peripheral surface 44 ... peripheral edge (second region) Example)
100 ... CLT panel reinforcement structure 131 ... 1st plate 131A ... 1st opening 131B ... Maximum surface 134 ... Peripheral (example of 1st region)
141 ... Second plate 141A ... Second opening 141B ... Maximum surface 144 ... Periphery (example of second region)

Claims

CLT panels with through holes and
A first plate with a first opening, a first stiffener with a first tube, and
It comprises a second plate with a second opening and a second stiffener with a second tube.
The first pipe extends from the first region including the first opening of the first plate in a direction intersecting the maximum surface of the first plate.
The second pipe extends from the second region including the second opening of the second plate in a direction intersecting the maximum surface of the second plate.
In the first reinforcing material, the first pipe is inserted into the through hole in a state where the outer peripheral surface of the first pipe is in contact with the inner peripheral surface of the through hole, and the maximum surface of the first plate. Is in contact with the first surface of the CLT panel.
In the second reinforcing material, the second pipe is inserted into the through hole in a state where the outer peripheral surface of the second pipe is in contact with the inner peripheral surface of the first pipe, and the maximum of the second plate is A CLT panel reinforcing structure whose surface is in contact with a second surface of the CLT panel located opposite to the first surface.
The first tube extends to the second plate and
The CLT panel reinforcing structure according to claim 1, wherein the second pipe extends to the first plate.
The first region is the peripheral edge of the first opening.
The CLT panel reinforcing structure according to claim 1 or 2, wherein the second region is a peripheral edge of the second opening.
The CLT panel reinforcing structure according to any one of claims 1 to 3, wherein the first plate and the second plate are adhered to the CLT panel with an adhesive.
The CLT panel reinforcing structure according to any one of claims 1 to 4, wherein the first plate, the first pipe, the second plate, and the second pipe are each made of metal.
The CLT panel is the CLT panel reinforcing structure according to any one of claims 1 to 5, which forms a wall of a building.