Orthogonally-laminated plate using bamboo material

Abstract

To provide an orthogonally-laminated material that improves dimension stability and strength.SOLUTION: An orthogonally-laminated plate 10 is obtained by laminating a plurality of plate members that adhere to each other. The plurality of plate members is: bamboo plate members b1, b2 constituted of bamboo plates or small bamboo square-bars; and wooden plate members a1, a2 constituted of wooden plates or small wooden square-bars. An upper surface layer, inner layers, and a lower surface layer are arranged in this order. The upper surface layer is a parallel layer constituted of the bamboo plate members b1. The inner layers are layers obtained by laminating an orthogonal layer constituted of the wooden plate members a1, and a parallel layer constituted of the wooden plate members a2 in this order. The lower surface layer is an orthogonal layer or a parallel layer constituted of the bamboo plate member b2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cross-laminated lumber board in which bamboo material is incorporated into a cross-laminated lumber mainly made of wood. [Background technology]

[0002] Conventionally, cross-laminated timber in which bamboo materials are laminated together with wood materials has been known (for example, Patent Document 1). Also known is a cross-laminated lumber board, which is formed by laminating and gluing three or more wooden veneers with their wood grains crossed at right angles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-231979 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the cross-laminated timber using bamboo shown in Patent Document 1 has excellent strength and dimensional stability, there is room for improvement in the combination of bamboo and wood to further utilize these characteristics depending on the application. In particular, in order to utilize the characteristic that bamboo has a much better dimensional stability than wood in an environment where it is likely to get wet, the present invention was arrived at by thinking that a water-resistant cross-laminated timber containing bamboo could be produced by covering the front and back of the conventional cross-laminated ply made only of wood with a bamboo laminated timber. In addition, since the surface of the cross-laminated timber according to the present invention is made only of bamboo, it is also characterized by being flame-retardant and resistant to combustion, and furthermore, in addition to the antibacterial and deodorizing effects of bamboo, the luxurious feel of bamboo is also an element required for building materials.

[0005] An object of the present invention is to provide a cross-laminated timber having improved dimensional stability, particularly in an environment where it is likely to be exposed to water, and improved tensile, compressive, bending and torsional strength. [Means for solving the problem]

[0006] The above-mentioned object is achieved by a cross-laminated board (10) formed by stacking and gluing a plurality of board members, the plurality of board members being bamboo board members (b1, b2) formed of bamboo boards or bamboo timbers and wooden board members (a1, a2) formed of wooden boards or wooden timbers, arranged in that order as an upper surface layer, an inner layer, and a lower surface layer, the upper surface layer being a parallel layer formed by the bamboo board members, the inner layer being a layer stacked in the order of an orthogonal layer formed by the wooden board members and a parallel layer formed by the wooden board members, and the lower surface layer being formed by the bamboo board members and being an orthogonal layer or parallel layer to the upper surface layer. Effect of the Invention

[0007] According to the present invention, it is possible to provide orthogonal laminated timber having improved dimensional stability in environments where it is more likely to be exposed to water than conventional orthogonal laminated timber, and improved strength in tension, compression, bending and torsion. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a cross-laminated board 10 according to a first embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a cross-laminated board (also called "cross-laminated lumber") according to an embodiment of the present invention will be described with reference to FIG. 1. As shown in FIG. 1, a cross-laminated board 10 is formed by laminating and bonding layers composed of bamboo board members b1 and b2 composed of bamboo boards or bamboo square timbers (including those adjusted by bonding and adhering them in the length direction with their fiber directions approximately parallel to each other) and wood board members a1 and a2 composed of wood boards or wooden square timbers (including those adjusted by bonding and adhering them in the length direction with their fiber directions approximately parallel to each other), and the layers are composed of parallel layers and cross layers. In FIG. 1, the parallel layers refer to layers in which the bamboo or wood fiber direction is the longitudinal direction of the cross-laminated board 10, and the cross layers refer to layers in which the bamboo or wood fiber direction is the transverse direction of the cross-laminated board 10.

[0010] The upper surface layer and the lower surface layer are each composed of a plurality of bamboo plate members b1 and b2 made of bamboo material. The upper surface layer is composed of the bamboo plate members b1 arranged so that the bamboo fiber directions of the plurality of bamboo plate members b1 are approximately parallel to each other and the end faces in the longitudinal direction of the bamboo plate members b1 are bonded to each other, and the lower surface layer is composed of the bamboo plate members b2 arranged so that the bamboo fiber directions of the plurality of bamboo plate members b2 are approximately parallel to each other and the end faces in the longitudinal direction of the bamboo plate members b2 are bonded to each other. The bamboo fiber directions of the bamboo plate members b1 of the upper surface layer and the bamboo fiber directions of the bamboo plate members b2 of the lower surface layer are configured to be approximately perpendicular to each other. In addition, as the adhesive used for bonding the bamboo plates, a protein-based adhesive, a synthetic resin-based adhesive, a synthetic rubber-based adhesive, or the like is used. In addition, the bamboo plate member b1 may be composed of a plurality of small square timbers or may be composed of a single plate. In addition, the bamboo fiber direction of the bamboo board member b1 of the upper surface layer and the bamboo fiber direction of the bamboo board member b2 of the lower surface layer may be configured to be approximately parallel to each other.

[0011] An inner layer is disposed between the upper surface layer and the lower surface layer. The inner layer is composed of two layers of multiple wooden board members a1 and a2 made of wood. The upper layer of the inner layer is composed of multiple wooden board members a1 arranged so that the wood fiber directions of the multiple wooden board members a1 are approximately parallel to each other and the longitudinal end faces of the wooden board members a1 are bonded together, and the lower layer is composed of multiple wooden board members a2 arranged so that the wood fiber directions of the multiple wooden board members a2 are approximately parallel to each other and the longitudinal end faces of the wooden board members a2 are bonded together. The wood fiber directions of the upper wooden board member a1 and the lower wooden board member a2 are configured to be approximately perpendicular to each other. In addition, as the adhesive used for bonding the wooden boards, a protein-based adhesive, a synthetic resin-based adhesive, a synthetic rubber-based adhesive, etc. are used. In addition, the wooden board members a1 and a2 may be composed of multiple small square timbers or may be composed of a single board. The inner layer may be composed of three or more layers, but it is preferable that the number of parallel layers and the number of orthogonal layers are the same.

[0012] In this way, the cross-laminated board 10 of this embodiment has a structure in which the bamboo board member of the upper surface layer and the bamboo board member of the lower surface layer are perpendicular to each other, the inner layer is composed of a wooden board member, the upper layer and the lower layer of the inner layer are perpendicular to each other, the upper surface layer and the upper layer of the inner layer are also perpendicular to each other, and the lower surface layer and the lower layer of the inner layer are also perpendicular to each other. With this structure, the cross-laminated board 10 of this embodiment has an effect that the weak point of the wood, which has poor dimensional stability against water and humidity, is protected by being sandwiched between bamboo, which is resistant to water and humidity and has excellent dimensional stability, and the cross-laminated board 10 is advantageous when used in places that are easily exposed to rain, etc. In addition, the cross-laminated board 10 of this embodiment has a bamboo laminate layer attached to the front and back of the cross-laminated wood with an adhesive, respectively, and the cross-laminated wood is surrounded by the bamboo laminate layer, so that even in an environment where water is splashed from the outside, the bamboo, which is resistant to water, can prevent water from entering the wood part.

[0013] In addition, since the above-mentioned embodiment is a preferred example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is not unduly limited by the above description. In addition, all of the configurations described in the above-mentioned embodiment are not essential constituent elements of the present invention. [Industrial Applicability]

[0014] The present invention can be widely used in cross-laminated boards, particularly in construction materials, furniture, sports equipment, etc., which require dimensional stability in environments where water is likely to splash, and strength in tension, compression, bending, and torsion. In recent years, cross-laminated timber has been increasingly used as a multi-story construction material in Japan, and in the future, it is expected that the bamboo-reinforced cross-laminated timber of the present invention will also be used in more cases to take advantage of its superior dimensional stability and strength in environments where water is likely to splash, which are superior to conventional cross-laminated timber made only of wood, if used in a way that suits the application. [Explanation of symbols]

[0015] 10 Cross-laminated board a1, a2 wood board members b1, b2 Bamboo plate members

Claims

[Claim 1] A cross-laminated board formed by laminating and bonding a plurality of plate members, The plurality of board members are bamboo board members made of bamboo boards or bamboo lumber slats and wooden board members made of wood boards or wood lumber slats, The width of the wooden board member is longer than the width of the bamboo board member, an upper surface layer, an inner layer, and a lower surface layer arranged in this order; The upper surface layer is a parallel layer made up of the bamboo plate member, The inner layer is a layer laminated in the order of an orthogonal layer formed of the wooden board member and a parallel layer formed of the wooden board member, A cross-laminated board, characterized in that the lower surface layer is composed of the bamboo board member and is a layer perpendicular or parallel to the upper surface layer.

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