JP2002210709A - Laminated lumber using bamboo and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a strength required as a structural material while an influence on deforestration owing to using a lumber as a laminated lumber is dissolved. SOLUTION: In a state wherein many split bamboo pieces 3 are stacked by unifying their fiber directions, a compression force is added to a thickness direction of the split bamboo piece 3 to be integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated material using bamboo, which is mainly used as a structural material such as a building structure or a construction material, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Glued wood is obtained by slicing wood, and laminating a large number of veneers having a certain width and length with an adhesive therebetween. It is manufactured by pressing in the thickness direction, and the fiber direction of each veneer is unified and laminated, which has the advantage of high axial strength.

[0003] In addition, since the raw material is wood, processing is easy, so for construction purposes, structural materials such as columns and beams,
In addition to being used as construction materials, it is used for a variety of purposes other than construction purposes. However, since it depends on wood, it can be a cause of deforestation due to deforestation due to increased demand.

On the other hand, a laminated timber that reduces production costs while using the environment in consideration of the environment by using bamboo as a part of veneer instead of wood, which grows quickly and has little effect on deforestation, is a special feature. It is proposed in Kaihei 9-57714.

[0005] This glued lumber is characterized in that the bamboo, which is obtained by vertically dividing a round bamboo, is directly pressed to laminate alternately a flat plate and a veneer made of wood. It is essential to use wood to supplement the
Wood does not become completely unused, and its contribution to environmental conservation is small.

In view of the above background, the present invention proposes a glued laminated lumber that can secure the strength as a structural material without relying on the use of wood.

[0007]

The lack of strength due to the use of bamboo as a laminated veneer can be compensated by aligning the fiber directions. Therefore, in the present invention, the fiber directions of bamboo are unified and sliced bamboo is sliced. By laminating thinned pieces of split bamboo, it is possible to secure the strength as a structural material without using wood.

Since bamboo has the property of growing faster than wood, it can cope with an increase in demand, and since no timber is used as glued lumber, there is no effect on the environment due to deforestation. It can contribute to environmental conservation.

The veneer is composed of a large number of thin bamboo pieces formed by, for example, slicing the bamboo which is obtained by vertically dividing the round bamboo along the peripheral surface as described in claim 2, and the whole bamboo bamboo. They are connected in a blind shape with one side aligned. A large number of veneers connected in a blind pattern have the same fiber direction of the bamboo pieces, are laminated with an adhesive between the veneers, and in that state, compressive force is applied in the thickness direction of the bamboo pieces. Is added to form a laminated wood.

[0010] Since the bamboo pieces are unified in the fiber direction and the veneer is laminated, the compressive strength and the tensile strength in the axial direction are increased as compared with the case where the fiber directions are crossed, and as a result, the bending strength is also increased. Therefore, the glued lumber secures its function as pillars, beams and other structural materials for construction.

Glued laminated lumber is used not only as a structural material but also as a non-structural member, a building material, a decorative material, a fitting material, etc., which do not require the same strength as a structural material for a building. , Used for daily necessities in general.

When the bamboo bamboo is directly forcibly pressed into a flat plate shape as in Japanese Patent Application Laid-Open No. Hei 9-57714, cuts continuous in the fiber direction (axial direction) of the flat plate are generated in parallel in the width direction. However, since the fibers become non-uniform in the width direction, the axial strength may become non-uniform in the width direction when a plurality of the flat plates are stacked and pressed.

On the other hand, according to the second aspect of the present invention, the laminated wood is manufactured by laminating a plurality of veneers composed of a large number of split bamboo pieces formed thinly from the split bamboo. The split bamboo pieces are densely arranged in the width and thickness directions,
Since the continuity of the fiber in the width direction is ensured, there is no possibility that the axial strength becomes uneven in the width direction, and the axial strength and the bending strength are improved as compared with the case where the flat plate made of split bamboo is laminated. .

The veneers are simply overlapped in a flat state and pressed to form a glued laminated body having a solid cross section. By bending a part of the width direction over the entire length and laminating, and applying a compressive force in two directions in the thickness direction of the piece of split bamboo to unite the veneer, a shaped steel mold having a web and a flange A glulam can be formed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a description will be given of a procedure for manufacturing a laminated wood 5 according to the method of the second embodiment. As shown in (a), the round bamboo 1 is divided vertically and divided into a plurality of split bamboos 2. Marutake 1
As the bamboo 2 is divided into a number of split bamboos 2, the sliced split bamboo pieces 3 can be densely arranged in the width direction and the thickness direction of the laminated wood 5 when laminating the veneers 4 described below, The round bamboo 1 is divided into 12 parts in FIG.

However, the split bamboo 2 is superimposed as a piece of split bamboo 3 that has been processed to be thin by being sliced along the peripheral surface thereof, etc. Even if the bamboo is compressed, it can be forced into a flat shape, and even if the number of divisions of the round bamboo 1 is small, the impact on the strength of the finished laminated wood 5 is small. Can be divided into four or less divisions, regardless of the number of divisions of the round bamboo 1.

After dividing the bamboo 1, each split bamboo 2 divided as shown in (b) is sliced by, for example, a slicer or a plane along the peripheral surface, and a plurality of split bamboos 2 are cut from one split bamboo 2. The bamboo pieces 3 are formed. Since it is more efficient to slice the bamboo pieces 3 with a slicer or the like having a straight blade when forming the bamboo pieces 3, the bamboo bamboo 2 is necessarily concentrically curved along the peripheral surface of the bamboo bamboo 2. No need to slice.

When slicing with a slicer or the like having a straight blade, the curved portions of the outer and inner peripheral surfaces of the split bamboo 2 are removed, and the split bamboo piece 3 is formed in a thin trapezoidal cross section. The thickness of one piece of bamboo bamboo 3 is 0. The thickness is preferably several mm to 1 mm, but may be thicker or thinner.

A large number of split bamboo pieces 3 are connected in a state where the faces of all the split bamboo pieces 3 are aligned as shown in FIG. The split bamboo pieces 3 are connected by a string-like or thread-like linear material 6,
The veneer-like veneer 4 is formed by abutting each other in the width direction, overlapping each other at the ends in the width direction, and being adhered to each other, or being fixed by a stapler or the like.

The split bamboo pieces 3 do not necessarily need to be connected in a blind shape, that is, they do not need to be laminated in the form of a veneer 4 and are arranged one by one or a plurality of sheets. It may be laminated.

The veneer 4 in which a large number of split bamboo pieces 3 are connected is (d)
As shown in (1), the fiber directions of all the bamboo pieces 3 are unified, and they are laminated with an adhesive interposed therebetween. When the veneers 4 are laminated, the bamboo pieces 3 constituting the lower veneer 4 and the adjacent veneers are placed on the laminated veneer 5 so that the axial strength of the finished laminated wood 5 is uniform in the width direction. The bamboo pieces 3 constituting the plate 4 are laid on each other so as to be broken and joined.

A large number of veneers 4 are integrated by applying a compressive force in the thickness direction of the split bamboo pieces 4 in a laminated state, and the laminated material 5 shown in (e) is manufactured. Pressing is performed under high-temperature and high-pressure steam to facilitate the integral molding of the veneer 4. In addition, prior to pressurization, the veneer 4 and the adhesive are subjected to chemical treatments such as antiseptic, anticorrosion, insect repellent, and difficult treatment. After the veneer 4 is pressed, both sides of the laminated wood 5 in the width direction and irregular portions of the edge surface are cut and formed.

FIGS. 2 (a) and 2 (b) show a state in which a part of the veneer 4 in the width direction is folded and laminated over the entire length of the veneer 4, and a compressive force is applied in two directions in the thickness direction, respectively. This shows a case where a laminated material 5 having a cross section and a groove section is formed.

(A) shows a case where one side in the width direction is bent to produce an L-shaped laminated body 5, and (b) shows a case where both sides in the width direction are folded to produce a grooved laminated body 5. A member having a T-shaped cross section can be formed from the laminated material 5 described above, and a member having a box-shaped cross section or an H-shaped cross section can be formed from the laminated material 5 having a groove-shaped cross section.

[0025]

According to the present invention, the bamboo fiber direction is unified and laminated bamboo pieces made of split bamboo are laminated to produce a laminated wood, so that a certain strength as a structural material can be secured without using wood. Can be. By not using any timber, it can respond to increasing demand and contribute to environmental conservation.

According to a second aspect of the present invention, a plurality of veneers composed of a plurality of pieces of thin bamboo thinly formed from the bamboo are laminated, so that the pieces of the bamboo are densely arranged in the width direction and the thickness direction of the laminated wood. Since the fibers are placed in a laid state and the continuity of the fibers in the width direction can be ensured, there is no possibility that the strength in the axial direction becomes uneven in the width direction. The axial strength and bending strength of the material are improved.

In the third and fourth aspects, the veneers are partially laminated in the width direction over the entire length and laminated, and the veneers are integrated by applying compressive force in two directions in the thickness direction. In this way, since a laminated steel-type laminated material having a web and a flange is formed, the range of applications as a structural material and a construction material is expanded.

[Brief description of the drawings]

1 (a) to 1 (e) are perspective views showing a procedure for manufacturing a glued laminated body having a solid cross section.

FIGS. 2 (a) and 2 (b) are perspective views showing examples of the production of a laminated wood having an L-shaped section and a groove-shaped section, respectively.

[Explanation of symbols]

1 ... round bamboo, 2 ... split bamboo, 3 ... split bamboo pieces, 4 single veneer,
5: laminated wood, 6: linear material.

Claims (4)

[Claims] 1. A laminated material using bamboo obtained by integrating a large number of split bamboo pieces by applying a compressive force in the thickness direction of the split bamboo pieces in a state where the fiber directions are unified and laminated. 2. A single veneer is formed by connecting a plurality of bamboo pieces, which are thinly formed from vertically divided bamboo bamboo bales, with their faces aligned to form a veneer. In a state where the fiber directions of the split bamboo pieces are unified and laminated with an adhesive between the veneers, a compressive force is applied in the thickness direction of the split bamboo pieces to use the bamboo to integrate the veneers. How to make glued laminated timber. 3. A large number of split bamboo pieces are unified by applying a compressive force in two directions in the thickness direction of the split bamboo pieces in a state where the fiber directions thereof are unified and a part thereof is folded and laminated. Glued wood using bamboo. 4. A single veneer is formed by connecting a plurality of thin bamboo pieces formed from vertically divided bamboo bamboos to form thin veneers with their faces aligned. While unifying the fiber direction of the piece of split bamboo, a part of the width of the veneer is bent in the width direction over the entire length of the veneer, and laminated with an adhesive between the veneers,
A method of manufacturing a laminated wood using bamboo, in which compressive force is applied in two directions in the thickness direction of the split bamboo pieces to integrate the veneers.