CLT PANEL REINFORCING STRUCTURE

TECHNICAL FIELD

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

BACKGROUND ART

Patent Literature 1 discloses a reinforcing structure of a beam made of a wooden squared timber provided with an insertion hole. The reinforcing structure includes a pair of reinforcing pieces screwed around the insertion hole in both side surfaces of the beam and a reinforcing pipe fitted into the insertion hole.

CITATION LIST
Patent Literature

Patent Literature 1: Japanese Patent Application Laid-Open No. 2003-176601

SUMMARY OF INVENTION
Technical Problem

CLT panels are sometimes adopted in buildings, such as houses. For example, when the CLT panel is used as a wall of a building, a through hole for passing piping and/or wiring is formed in the CLT panel. When the through hole is formed in the CLT panel, bearing strength of the CLT panel decreases around the through hole.

In the reinforcing structure described in Patent Literature 1, the reinforcing pieces are fixed to the surfaces of the beam by a large number of screws to reinforce strength against shear force around the insertion hole of the beam. However, when the reinforcing structure described in Patent Literature 1 is applied around the through hole of the CLT panel and the large number of screws are screwed into the CLT panel, each screw cuts fibers of wooden boards constituting the CLT panel, which sometimes rather reduces strength of the CLT panel.

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

Solution to Problem

(1) A CLT panel reinforcing structure according to the present invention includes: a CLT panel having a through hole; a first reinforcing member having a first plate and a first pipe, the first plate having a first opening; and a second reinforcing member having a second plate and a second pipe, the second plate having a second opening. The first pipe extends from a first region including the first opening of the first plate in a direction crossing a largest surface of the first plate. The second pipe extends from a second region including the second opening of the second plate in a direction crossing a largest surface of the second plate. In the first reinforcing member, the first pipe is inserted into the through hole in a state where an outer peripheral surface of the first pipe abuts on an inner peripheral surface of the through hole, and the largest surface of the first plate abuts on a first surface of the CLT panel. In the second reinforcing member, the second pipe is inserted into the through hole in a state where an outer peripheral surface of the second pipe abuts on an inner peripheral surface of the first pipe, and the largest surface of the second plate abuts on a second surface located opposite to the first surface of the CLT panel.

In a connection place between the first pipe and the first plate, the cross-sectional area along the largest surface of the first plate is larger than the cross-sectional area of only the first pipe, and therefore bearing strength against a compressive force in the connection place is larger than bearing strength of only the first pipe. Also in a connection place between the second pipe and the second plate, the bearing strength similarly increases. Also in a place where the outer peripheral surface of the second pipe and the outer peripheral surface of the first pipe abut on each other, bearing strength is larger than bearing strength of only the first pipe or bearing strength of only the second pipe. Thus, bearing strength in the vicinity of the through hole of the CLT panel can be efficiently reinforced.

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

The first pipe and the second pipe overlap with each other in the entire region of the through hole of the CLT panel, and therefore the bearing strength in the vicinity of the through hole of the CLT panel can be more efficiently reinforced.

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

The first plate is prevented from projecting from an opening end of the first pipe into the opening, and the second plate is prevented from projecting from an opening end of the second pipe into the opening.

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

For fixing the first plate and the second plate to the CLT panel, no screws are required or the number of screws to be used can be reduced as small as possible, which prevents cutting wooden fibers of the CLT panel by the screws.

(5) Preferably, the first plate, the first pipe, the second plate, and the second pipe are each formed of metal.

(6) The CLT panel forms a wall of a building.

Advantageous Effects of the Invention

The present invention can efficiently reinforce the strength around the through hole of the CLT panel.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a CLT panel reinforcing structure 10 according to an embodiment.

FIG. 2 is a cross-sectional view along a II-II line in FIG. 1.

FIG. 3(A) is a front view of a largest surface 31B of a first plate 31 illustrating a peripheral edge 34 according to the embodiment, and FIG. 3(B) is a front view of a largest surface 41B of a second plate 41 illustrating a peripheral edge 44 according to the embodiment.

FIG. 4(A) is an exploded perspective view of a first reinforcing member 30 and a second reinforcing member 40, and FIG. 4(B) is a cross-sectional view along a IVB-IVB line in FIG. 2 of the first reinforcing member 30.

FIG. 5 is a cross-sectional view of a CLT panel reinforcing structure 100 illustrating a state where a tip 32C is not present around an opening end of a through hole 21.

FIG. 6 is a cross-sectional view of a CLT panel reinforcing structure 100 illustrating a first plate 131 and a second plate 141 according to a modification example.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the present invention is described. It is a matter of course that the embodiment described below is merely an example of the present invention and the embodiment of the present invention can be altered as appropriate insofar as the gist of the present invention is not altered. In the following description, a vertical direction 7 is defined with a state where a CLT panel reinforcing structure 10 is installed for use (state of FIG. 1) as a reference, a longitudinal direction 11 is defined as a direction in which a CLT panel 20 extends and which is orthogonal to the vertical direction 7, and a width direction 12 is defined as a direction which is a thickness direction of the CLT panel 20 and is orthogonal to both the vertical direction 7 and the longitudinal direction 11.

The CLT panel reinforcing structure 10 of this embodiment is illustrated in FIG. 1 and FIG. 2. The CLT panel reinforcing structure 10 is used as a bearing wall in houses or condominiums. CLT is an abbreviation for Cross Laminated Timber, and the same applies hereinafter.

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

[CLT Panel 20]

The CLT panel 20 forms a wall of a building, such as a house or a condominium. The CLT panel 20 is a flat board obtained by laminating and adhering wooden boards, such as sawn boards, such that fiber directions are orthogonal to each other in each layer. The size of the CLT panel 20 is not particularly limited, and for example, the CLT panel 20 has a flat plate shape with a vertical length of 3000 mm, a horizontal length of 2000 mm, and a thickness of 90 mm. As illustrated in FIG. 1, the CLT panel 20 has a first surface 22 and a second surface 23 which are largest surfaces and are in a front-and-rear relationship.

As illustrated in FIG. 1 and FIG. 2, the CLT panel 20 has a through hole 21 extending along the width direction 12. Piping (not illustrated) and/or wiring (not illustrated) is passed through the through hole 21. The through hole 21 is not particularly limited and has a cylindrical shape with a diameter of about 110 mm, for example. The through hole 21 is chamfered such that an opening end on a first surface 22 side does not interfere with a connection place 33 described in detail below. The position where the through hole 21 is formed is also not particularly limited and is preferably a position where the first reinforcing member 30 and the second reinforcing member 40 do not interfere with a floor and a ceiling.

[First Reinforcing Member 30]

As illustrated in FIG. 1 and FIG. 2, the first reinforcing member 30 is partly inserted into the through hole 21 of the CLT panel 20 and is fixed to the first surface 22 of the CLT panel 20. The first reinforcing member 30 includes a first plate 31 and a first pipe 32, the first plate 31 having a first opening 31A.

The first plate 31 is a rectangular metal flat plate and has the first opening 31A formed substantially in the center. The first plate 31 has largest surfaces 31B, 31C which are in a front-and-rear relationship. The largest surface 31B abuts on the first surface 22 of the CLT panel 20. The largest surface 31C faces in the same direction as that of the first surface 22 of the CLT panel 20. The largest 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, and 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. For example, the diameter of the first opening 31A is about 110 mm, which is substantially the same as the diameter of the through hole 21.

The first pipe 32 extends from a part of a peripheral edge 34 of the first opening 31A of the first plate 31 in a direction orthogonal to the largest surface 31B of the first plate 31 (example of a crossing direction). As illustrated in FIG. 3(A), the peripheral edge 34 refers to a region of the largest surface 31B from a boundary with the first opening 31A to a boundary represented by a circle having the same center as the center of the first opening 31A and having a diameter at least 1.25 times the diameter of the first opening 31A, for example. In this embodiment, the first pipe 32 extends from the boundary with the first opening 31A, in the peripheral edge 34. The peripheral edge 34 and the first opening 31A are examples of a first region.

The first pipe 32 is a metal circular pipe. The first pipe 32 is joined to the first plate 31 by welding an outer peripheral surface 32A to the first opening 31A. In the connection place 33, a weld metal is charged or laminated between the outer peripheral surface 32A and the largest surface 31B. The outer diameter of the first pipe 32 is substantially the same as the diameter of the through hole 21. The dimension where the first pipe 32 projects from the largest surface 31B of the first plate 31 is equal to the thickness of the CLT panel 20 and is 90 mm in this embodiment. When the weld metal is present in a connection place 43 in the outer periphery of a second pipe 42 of a second plate 41 as in this embodiment, the first pipe 32 only needs to extend to the connection place 43 and may not necessarily project in a length equal to the thickness of the CLT panel 20.

[Second Reinforcing Member 40]

As illustrated in FIG. 1 and FIG. 2, the second reinforcing member 40 is partly inserted into the first pipe 32 and is fixed to the second surface 23 of the CLT panel 20. As also illustrated in FIG. 4(A), the second reinforcing member 40 includes the second plate 41 and the second pipe 42, the second plate 41 having a second opening 41A.

The second plate 41 is a rectangular metal flat plate and has the second opening 41A formed substantially in the center. The second plate 41 has largest surfaces 41B, 41C which are in a front-and-rear relationship. The largest surface 41B abuts on the second surface 23 of the CLT panel 20. The largest surface 41C faces in the same direction as that of the second surface 23 of the CLT panel 20. The largest 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 and is the same as the size of the first plate 31, for example.

The second pipe 42 extends from a part of a peripheral edge 44 of the second opening 41A of the second plate 41 in a direction orthogonal to the largest surface 41B of the second plate 41 (example of a crossing direction). As illustrated in FIG. 3(B), the peripheral edge 44 refers to a region of the largest surface 41B from a boundary with the second opening 41A to a boundary represented by a circle having the same center as the center of the second opening 41A and having a diameter at least 1.25 times the diameter of the second opening 41A, for example. In this embodiment, the second pipe 42 extends from the boundary with the second opening 41A, in the peripheral edge 44. The peripheral edge 44 and the second opening 41A are examples of a second region.

The second pipe 42 is a metal circular pipe. The second pipe 42 is joined to the second plate 41 by welding an outer peripheral surface 42A to the second opening 41A. In the connection place 43, a weld metal is charged or laminated between the outer peripheral surface 32A and the largest surface 41B. The second pipe 42 extends to the first plate 31. The outer diameter of the second pipe 42 is substantially 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 abuts on an inner peripheral surface 32B of the first pipe 32.

[Screws 50]

As illustrated in FIG. 1, the screws 50 are intruded into the CLT panel 20 by screwing from the outside of the first plate 31 and the second plate 41 to temporarily fix the first plate 31 to the first surface 22 of the CLT panel 20 and temporarily fix the second plate 41 to the second surface 23 of the CLT panel 20. The positions of the screws 50 in the first plate 31 and the second plate 41 are not particularly limited and are four corners of the first plate 31 and the second plate 41, for example. Although not illustrated in each figure, through holes through which shaft portions of the screws 50 are inserted are formed in the first plate 31 and the second plate 41.

[CLT Panel Reinforcing Structure 10]

As illustrated in FIG. 1 and FIG. 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 abuts on an inner peripheral surface 21A of the through hole 21. The largest surface 31B of the first plate 31 is coated with an adhesive. Thus, the first pipe 32 is inserted into the through hole 21 until the largest surface 31B abuts on the first surface 22 of the CLT panel 20, so that the largest surface 31B of the first plate 31 and the first surface 22 of the CLT panel 20 are adhered to each other by the adhesive. Until the adhesive is cured, the screws 50 are inserted through the through holes of the first plate 31 and driven into the CLT panel 20 as necessary.

As illustrated in FIG. 1 and FIG. 2, in the second reinforcing member 40, the second pipe 42 is inserted into the through hole 21 from a second surface 23 side of the CLT panel 20. The first pipe 32 has already been inserted into the through hole 21, and therefore the outer peripheral surface 42A of the second pipe 42 inserted into the through hole 21 abuts on the inner peripheral surface 32B of the first pipe 32. The largest surface 41B of the second plate 41 is coated with an adhesive. Thus, the second pipe 42 is inserted into the through hole 21 until the largest surface 41B abuts on the second surface 23 of the CLT panel 20, so that the largest surface 41B of the second plate 41 and the second surface 23 of the CLT panel 20 are adhered to each other by the adhesive. Until the adhesive is cured, the screws 50 are inserted through the through holes of the second plate 41 and driven into the CLT panel 20 as necessary.

Operational Effects of Embodiment

As illustrated in FIG. 4(B), in the connection place 33 between the first pipe 32 and the first plate 31, the cross-sectional area along the largest surface 31B of the first plate 31 is larger than the cross-sectional area of only the first pipe 32. Thus, in the connection place 33, bearing strength of the first reinforcing member 30 against a compressive force P is larger than bearing strength of only the first pipe 32. Similarly, also in the connection place 43 between the second pipe 42 and the second plate 41, bearing strength of the second reinforcing member 40 against the compressive force P is larger than bearing strength of only the second pipe 42 in the connection place 43.

As illustrated in FIG. 2, in a place 51 where the outer peripheral surface 42A of the second pipe 42 and the outer peripheral surface 32A of the first pipe 32 abut on each other, bearing strength by the first pipe 32 and the second pipe 42 is similarly larger than the bearing strength of only the first pipe 32 or the bearing strength of only the second pipe 42. Thus, bearing strength 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.

The first pipe 32 and the second pipe 42 overlap with each other in the entire region in the width direction 12 of the through hole 21 of the CLT panel 20, and therefore the bearing strength in the vicinity of the through hole 21 of the CLT panel 20 is more efficiently reinforced.

The diameter of the first opening 31A and the diameter of the through hole 21 are designed to be substantially the same and the diameter of the second opening 41A and the inner diameter of the first pipe 32 are designed to be substantially the same. Therefore, the first plate 31 does not project from an opening end of the first pipe 32 into the opening, and the second plate 41 does not project from an opening end of the second pipe 42 into the opening.

The first plate 31 and the second plate 41 are fixed to the CLT panel 20 by the adhesive. Reinforcement in the vicinity of the through hole 21 of the CLT panel 20 by the first reinforcing member 30 and the second reinforcing member 40 is not realized by fixing the first plate 31 and the second plate 41 to the CLT panel 20 by the screws 50, but is realized by increasing bearing strength caused by increasing the cross-sectional areas of the first reinforcing member 30 and the second reinforcing member 40 in the connection places 33, 43 and the place 51, as described above. Hence, the number of the screws 50 used for fixing the first plate 31 and the second plate 41 to the CLT panel 20 can be reduced as small as possible, which prevents cutting wooden fibers of the CLT panel 20 by the screws 50.

MODIFICATION EXAMPLES

In the above-described embodiment, the first pipe 32 extends to the second plate 41 and a tip 32C is located in the vicinity of the second opening 41A as illustrated in FIG. 2, but the tip 32C may not necessarily be located in the vicinity of the second opening 41A as illustrated in FIG. 5. At this time, if the place 51 is provided in which the outer peripheral surface 42A of the second pipe 42 and the outer peripheral surface 32A of the first pipe 32 abut on each other, the second pipe 42 may not necessarily extend to the first plate 31. Even such a configuration realizes increasing the bearing strength in the vicinity of the through hole 21 caused by increasing the cross-sectional areas of the first reinforcing member 30 and the second reinforcing member 40 in the connection places 33, 43 and the place 51.

In the connection place 43, a weld metal may be laminated on the largest surface 41C and the tip 32C may abut on the largest surface 41B. Thus, the first pipe 32 and the second pipe 42 overlap with each other without any gap in the entire region in the width direction 12 of the through hole 21 of the CLT panel 20, and therefore the bearing strength in the vicinity of the through hole 21 of the CLT panel 20 is more efficiently reinforced. In the first pipe 32, the tip 32C abutting on the second plate 41 may be adhered to the largest surface 41B of the second plate 41 by an adhesive.

The diameter of the first opening 31A may not necessarily be substantially the same as the diameter of the through hole 21. For example, as illustrated in FIG. 6, a first plate 131 may be used in which the diameter of a first opening 131A is smaller than the inner diameter of the first pipe 32. The first opening 131A has a diameter of at least 50% or more of the inner diameter of the first pipe 32 and preferably has a length of 80% or more of the inner diameter of the first pipe 32. In the example illustrated in FIG. 6, the first opening 131A has a diameter of 80% of the inner diameter of the first pipe 32.

The first pipe 32 extends from a part of a 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 refers to a region of a largest surface 131B from a boundary with the first opening 131A to a boundary represented by a circle having the same center as the center of the first opening 131A and having a diameter about twice the diameter of the first opening 131A, for example. At this time, the first plate 131 is joined to the first pipe 32 by welding the largest surface 131B to an end surface of the first pipe 32. Even such a configuration prevents the first plate 131 from projecting from the opening end of the first pipe 32 into the opening. The peripheral edge 134 and the first opening 131A are examples of the first region.

The diameter of the second opening 41A may not necessarily be substantially the same as the inner diameter of the first pipe 32. For example, as illustrated in FIG. 6, a second plate 141 may be used in which the diameter of a second opening 141A is smaller than the inner diameter of the second pipe 42. The second opening 141A has a diameter of at least 50% or more of the inner diameter of the second pipe 42 and preferably has a length of 80% or more of the inner diameter of the second pipe 42. In the example illustrated in FIG. 6, the second opening 141A has a diameter of 80% of the inner diameter of the second pipe 42.

The second pipe 42 extends from a part of a 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 refers to a region of a largest surface 141B from a boundary with the second opening 141A to a boundary represented by a circle having the same center as the center of the second opening 141A and having a diameter about twice the diameter of the second opening 141A, for example. At this time, the second plate 141 is joined to the second pipe 42 by welding the largest surface 141B to an end surface of the second pipe 42. Even such a configuration prevents the second plate 141 from projecting from the opening end of the second pipe 42 into the opening. The peripheral edge 144 and the second opening 141A are examples of the second region.

The screws 50 may be unnecessary for fixing the first plate 31 and the second plate 41 to the CLT panel 20. Thus, the wooden fibers of the CLT panel 20 are not cut by the screws 50.

In the above-described embodiment, one through hole 21 is provided, and therefore one pipe is provided for each of the plates 31, 41. When the CLT panel 20 has a plurality of through holes 21, each plate may be provided with a plurality of pipes.

In the connection place 33, a weld metal may be laminated on the largest surface 31C. At this time, in the through hole 21, the opening end on the first surface 22 side may not necessarily be chamfered.

The position where the first plate 31 is welded to the outer peripheral surface 32A may not necessarily be an end along the width direction 12 of the first pipe 32.

The position where the second plate 41 is welded to the outer peripheral surface 42A may not necessarily be an end along the width direction 12 of the second pipe 42.

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

The first pipe 32 may extend from a region outside the peripheral edge 34 surrounding the first opening 31A. The second pipe 42 may extend from a region outside the peripheral edge 44 surrounding the second opening 41A.

DESCRIPTION OF REFERENCE NUMERALS

10 CLT panel reinforcing structure

20 CLT panel

21 through hole

21A inner peripheral surface

22 first surface

23 second surface

30 first reinforcing member

31 first plate

31A first opening

31B largest surface

32 first pipe

32A outer peripheral surface

32B inner peripheral surface

34 peripheral edge (example of first region)

40 second reinforcing member

41 second plate

41A second opening

41B largest surface

42 second pipe

42A outer peripheral surface

44 peripheral edge (example of second region)

100 CLT panel reinforcing structure

131 first plate

131A first opening

131B largest surface

134 peripheral edge (example of first region)

141 second plate

141A second opening

141B largest surface

144 peripheral edge (example of second region)

CLT PANEL REINFORCING STRUCTURE

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CPC

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