JPH1034613A - Structure of laminated wood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the improvement and controlling of the strength of a lami nated wood and the same strength with a small crosssection as that of conven tional ones by a structure wherein a reinforcing fiber sheet is interposed between the adhesive surfaces of wooden divided pieces. SOLUTION: A bonded wood 1 is produced by bonding a plurality of laminas as the wooden divided pieces prepared by sawing material wood and a plurality of reinforcing fiber sheets 3 interposed between the laminas with adhesive 4. The laminas 2 sawn out of material wood are dried artificially and then set so as to arrange their directions of fiber parallel to oneanother and finally applied with pressure to the directions of their length, width and thickness in order to bond them with one another through adhesive 4. The reinforcing fiber sheet 3 is made of carbon fiber, glass fiber or the like formed in woven fabric, nonwoven fabric or the like and interposed within the bonded wood 1 by being inserted between the laminas 2 at their lamination. In the reinforced bonded wood 1, a large resisting force is developed by the reinforcing fiber sheet 3 against the tensile force in bending direction, resulting in allowing to obtain the same strength with the small cross-section, as that of conventional ones.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated wood structure, and more particularly, to a laminated wood structure obtained by laminating a plurality of woody pieces with an adhesive.

[0002]

2. Description of the Related Art Conventionally, a new material called engineering wood has been used as a wooden structural material of a wooden building. The engineering wood includes laminated wood, LVL, and the like.

[0003] Glued laminated wood is a kind of synthetic wood obtained by laminating a ground plate or small square wood called lamina in such a manner that the fiber directions thereof are almost parallel to each other and in the length, width and thickness directions. First, 1.5-2.5 cm of the log
It is formed by laminating and laminating artificially dried laminating surface while applying pressure in the width, thickness and length directions. When this laminated material is used for a structure, it is possible to obtain a large section material, a long material, an arch material, and the like that cannot be obtained by lumbering.

[0004] Glued lumber can be used freely even for large wooden buildings by the Building Standard Law revised in 1987, and the JAS glued lumber standard has a thickness of 7.
Standards for large-section structural glulams having a size of 5 cm or more and a width of 15 cm or more have been separated and independent. Also, in the laminated material of ordinary lamina, the allowable stress for compression, tension, and bending in the fiber direction and the allowable squeezing stress are specified to be approximately 1.1 to 1.5 times the allowable stress of the normal structural lumber. . The permissible stress of this glued lumber can be made larger than that of ordinary structural lumber by the effect of sufficient drying of the lamina, homogenization of the lumber by dispersing the defects, etc. growing.

[0005] LVL is an abbreviation of Laminated Veneer Lumber, and is a laminated material in which single plates are bonded in multiple layers. The LVL is formed by cutting a veneer with a rotary lace or a slicer and bonding them while laminating the fibers in parallel. This LVL can also be used for a structure as well as a glulam if it is devised in terms of how to make and use.

[0006]

However, in the case of such conventional laminated woods and engineering woods such as LVL, the permissible stress and the permeation stress for the compression, pulling and bending in the fiber direction of the laminated wood of the ordinary lamina are considered. Approximately 1.1 to allowable stress of ordinary structural wood
Although it was 1.5 times, the allowable stress was naturally limited by the strength of the base material.

[0007] Therefore, in the case of conventional laminated wood such as laminated wood and LVL, in a building requiring a large span, in order to obtain a large strength, the cross-sectional dimensions of the laminated wood must be increased to obtain a large space. This has been an obstacle to the effective use of.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. It is an object of the present invention to improve and adjust the strength of laminated wood by interposing a reinforcing fiber sheet. It is an object of the present invention to provide a laminated wood structure which can obtain the same strength with a small cross section as compared with the large cross section laminated wood.

[0009]

In order to achieve the above object, according to the present invention, in a laminated wood in which a plurality of wooden split pieces are laminated with an adhesive, a reinforcing fiber sheet is provided on the bonding surface of the wooden split pieces. It is characterized by being interposed.

According to the structure of the laminated wood of the present invention having the above structure, the strength of the laminated wood can be adjusted by adjusting the strength, arrangement and amount of the reinforcing fiber sheet itself. further,
Compared to conventional large-section laminated timber, it is also possible to obtain the same strength with a small cross section, so it is possible to form laminated wood with optimal strength and dimensions for buildings requiring large spaces and spans And the space of the building can be used effectively.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a laminated wood as an example of the laminated wood according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view thereof. In the laminated wood 1 of the present embodiment, a plurality of laminas 2 and 2 serving as wood split pieces made from raw wood and a plurality of reinforcing fiber sheets 3 and 3 interposed therebetween are bonded with an adhesive 4. It is configured.

The lamina 2 is sawn from raw wood, then artificially dried, and bonded with an adhesive 4 while applying pressure in the length, width and thickness directions so that the fiber directions thereof are substantially parallel to each other. In this embodiment, a plurality of reinforcing fiber sheets 3 are interposed between the laminas 2. This reinforcing fiber sheet 3
It is formed into a woven fabric (knitted fabric), a nonwoven fabric, a net, or the like by using fibers such as carbon fiber, glass fiber, vinylon fiber, and aramid fiber. The reinforcing fiber sheet 3 is interposed between the laminated members 1 by being inserted between the laminas 2 when they are laminated and adhered with the adhesive 4.

The glued laminated wood 1 reinforced by the reinforcing fiber sheet 3 is used for a beam of a large span building. When stresses such as compression, tension, bending, and shearing work on the beam, the reinforcing fiber sheet 3 generates a large resistance to the tensile force, particularly in the bending direction, and the amount of bending is reduced. Therefore, the allowable stress level increases, and it becomes possible to obtain the same strength with a small cross section as compared with the conventional large-section glued laminated timber. The laminated wood can be used, and the space of the building can be effectively used. In the case of the laminated wood 1 used especially for a large building, the reinforcing fiber sheet 3 on the lower surface also generates a large resistance to the tensile force with respect to the bending due to the weight of the laminated wood 1 itself. The effect of is shown.

In FIG. 2, the reinforcing fiber sheet 3 is evenly and horizontally interposed between the laminas 2 and 2, but in FIG. It is interposed in.

Further, the reinforcing fiber sheet 3 is not only inserted into the entire surface of each of the laminas 2 and 2, but also partially interposed as required for reinforcement, as shown in FIGS. Is also possible. In FIG. 4, the reinforcing fiber sheet 3 is interposed only on the lower surface side of the laminated wood 1. In FIG. 5, the laminated wood 1 is sequentially extended from the upper surface to the lower surface from both sides to the center, and more reinforcing fiber sheets 3 are interposed on the lower surface. In FIG. 6, the laminated wood 1 is laminated horizontally, and the reinforcing fiber sheets 3 having a wide width and a narrow width are interposed in every other layer. It is interposed between them. In FIG. 7, the reinforcing fiber sheet 3 is interposed so as to extend to both end portions as going downward from the center on the upper surface side of the laminated wood 1. In FIG. 8, the reinforcing fiber sheet 3 is interposed in a staggered manner over the entire area between the laminas 2 and 2 of the laminated wood 1.

As described above, it is possible to reinforce only the portion to be reinforced, not the whole of the laminated wood 1.
The strength of the glued laminated wood 1 can be adjusted by the strength, arrangement, and amount of the reinforcing fiber sheet 3 itself.
It is possible to form laminated wood having the optimum strength and dimensions for a building requiring a span, and to effectively use the space of the building.

Further, in this embodiment, the laminated wood is shown as an example of the laminated wood, but the present invention can be similarly applied to an LVL or the like.

Furthermore, the present invention can be applied to laminated wood using a wood-based board formed by using a crushed piece of wood as a base material and solidifying it with an adhesive.

[0019]

As described above, in the laminated wood structure according to the present invention, in a laminated material in which a plurality of wooden split pieces are laminated by using an adhesive, a reinforcing fiber sheet is provided on the bonding surface of the wooden split pieces. Since it is characterized by being interposed, it is possible to obtain stronger strength with the same cross section as that of conventional large-section laminated wood. Further, only the portion to be reinforced can be reinforced, and the strength can be adjusted by the strength, arrangement and amount of the reinforcing fiber sheet itself.
Furthermore, compared to conventional large-section laminated timber, it is also possible to obtain the same strength with a small cross section, so that laminated wood with optimal strength and dimensions for buildings requiring a large space and span is formed. And the space of the building can be used effectively.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the first embodiment of the present invention.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a fifth embodiment of the present invention.

FIG. 7 is a diagram showing a sixth embodiment of the present invention.

FIG. 8 is a diagram showing a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glulam 2 Lamina 3 Reinforcing fiber sheet 4 Adhesive

Claims (1)

[Claims] 1. A laminated wood structure in which a plurality of wooden split pieces are laminated with an adhesive in a laminated structure, wherein a reinforcing fiber sheet is interposed on the bonding surface of the wooden split pieces.