JPH0578739U - Large section laminated wood for composite structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is to arrange a laminated veneer single plate laminated material without a vertical joint (finger joint) in the longitudinal direction to form an outer layer material, and in the middle, an inner layer, As the intermediate layer, a laminated material made of a trapezoidal material is arranged. The purpose of this is to obtain a large cross-section laminated material for a composite structure in which the weakness in bending rigidity of the trapezoidal laminated material used as the inner layer and the intermediate layer is reinforced. [Structure] In a large cross-section laminated lumber for structural use, which is composed by laminating and adhering a plurality of laminated materials integrally, it is formed by adhering and laminating a plurality of sawing board veneers, and there is no longitudinal joint (finger joint) in the longitudinal direction. A single plate laminated material is arranged vertically to form an outer layer material, and an intermediate layer and a trapezoidal laminated material are arranged in between. These are characterized in that they are laminated and bonded together to form a large cross-section laminated timber for structures such as beams and girders of wooden buildings.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a large cross-section laminated timber for a structure such as a building, and more particularly to a large cross-section laminated timber for a composite structure, which is formed by using a laminated laminated plate / plywood laminated material as a reinforcing material.

[0002]

[Prior Art]

 The use of stacking boards (LVL) in which the fiber directions of the board are parallel to each other and laminated and bonded is showing various uses. On the other hand, from the viewpoints of effective utilization of wood resources by utilizing small-diameter trees, bent wood, and thinned wood, and strengthening of proof stress as a structural material for buildings, etc. It is used as a laminated lumber having a relatively large cross section by laminating and adhering timber with wood so that the fiber directions are parallel to each other.

In particular, because of exhaustion of wood resources, it has become difficult to easily obtain solid wood suitable as a beam material having a large cross section used in a wooden building. Therefore, recently, there is a movement to use laminated lumber in places such as columns, beams, and girders of buildings where a considerable load is applied.

Laminated material applied to a conventional structure is composed of an outer layer, an intermediate layer, an inner layer, an intermediate layer, and an outer layer as shown in the longitudinal section of FIG. 2, and each layer has a thickness. Laminated wood made of wood and arranged so that the seams do not overlap or line up with the adjacent components in the length direction, and a longitudinal joint (finger joint) is provided at the seams to glue them together. Is composed of. Needless to say, in this structure, the constituent material that constitutes the outer layer is one that has a finer grain than the inner layer and the intermediate layer.

[0005]

[Problems to be solved by the device]

 As described above, the problem to be solved by the present invention is that conventional laminated lumber such as floor board laminate (LVL) is sufficient as a construction material such as Nagashi, Kamoi, sill, stile, and rim for residential construction. In addition, it has sufficient strength as a structural member for applications such as stairs, windows, doors, and other unit components in homes where large proof stress is not required. Because it is used.

However, it cannot be said that the above-mentioned conventional structural laminated wood has sufficient strength against bending rigidity. Therefore, when it is used for structural purposes such as beams and girders, Especially when used in large wooden buildings, distortion is caused by various loads from the stacking direction, especially arcuate bending, that is, bending is likely to occur, and this bending causes a large deformation of the entire building. Will occur.

In order to suppress this phenomenon, it is necessary to increase the thickness of the laminated material in the laminating direction. Therefore, when constructing wooden buildings, large-scale structural laminated lumber is used as beams and girders.

Further, in order to suppress the flexure, relatively expensive hard plate members are jointly arranged on both outer sides in the laminating direction of the structural large cross-section laminated wood. It could not be said that it has sufficient bending rigidity as a laminated wood for construction.

[0009]

[Means for Solving the Problems]

 The present invention has been made in view of the above circumstances, and a means for solving the problem is to construct a large cross-section laminated timber for structure in which a plurality of laminated materials are integrally laminated and bonded, and Laminated boards are formed by adhesive lamination, and laminated sawn veneer laminated materials without longitudinal joints (finger joints) are placed one above the other as an outer layer material, with an inner layer and an intermediate layer in the middle. A laminated material made of a trapezoidal material is arranged. These are laminated and bonded together to form a large cross-section laminated material for composite structures such as beams and girders of wooden buildings.

[0010]

[Advantages] According to the above-mentioned means, since the sawn veneer laminated material without longitudinally connected portions is disposed on the upper and lower surfaces of the structural large cross-section laminated lumber, the load is applied from the laminating direction. Tensile stress and compressive stress due to bending deformation applied to the longitudinal section of large section laminated wood for composite structure when received are improved due to the existence of the laminated veneer laminated sheet without the joint of the outer layer material. To do.

Therefore, the maximum tensile stress or the maximum compressive stress generated in the large cross-section laminated timber for composite structure subjected to the bending force is the inner layer and the intermediate layer, and the upper and lower outer layer materials which are the sawn timber single plate without the vertical joint. This corresponds to the plate laminated material, and a theoretically ideal conversion cross section regarding the section modulus is formed in the vertical cross section of the large cross-section laminated material for composite structure to improve the strength.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. The large cross-section laminated timber 1 for a composite structure of this embodiment is used as a beam for a large wooden building (gym, auditorium, etc.), and as shown in FIG. 1, a plurality of trapezoidal cross-sections are vertically stacked. The wooden lamina of 3 is used as the inner layer material 3 and the intermediate layer material 3, and the top and bottom surfaces of the outer layer material 2 are laminated with the laminated wood veneer laminated material with the fiber directions of the ground veneer parallel to each other. And is configured to reinforce the strength against bending rigidity.

In the present invention, the veneer veneer laminate used as the outer layer material 2 is different from the veneer laminate (LVL), and the raw wood has a constant thickness (usually 30 mm to 50 mm) and a constant after artificial drying. After reaching the equilibrium water content after the curing period, the thin plate is again sawn (thickness at this time is about 5 mm) and further cut by a planer to obtain a sawn plate with a thickness of 3 mm. Finish into a veneer. Through these steps, the material surface is made uniform and activated, the adhesive is evenly applied, the wetting phenomenon is good, and adhesion failure does not occur. On the other hand, since the single plate laminated material (LVL) is a raw material and is subjected to veneer processing, variations in the thickness occur after artificial drying, causing a phenomenon of dipping on the material surface.

Further, the surface was blunted and a reverse stitch was generated, which was a cause of defective adhesion. From this point, there is a difference in strength between the ground veneer laminate and the veneer laminate (LVL).

Next, the specific structure will be described. The outer layer material 2 is a laminated veneer laminated sheet having 9 mm laminated veneer laminated with a thickness of 3 mm and laminated and bonded so that their fiber directions are parallel to each other. Is. The lumber veneer laminate of the outer layer material 2 is configured so that there is no longitudinal joint (finger joint) in the longitudinal direction.

That is, a span or a girder required as a beam, for example, when the length is set to 10 m, it is constituted by a part having no vertical joint (finger joint) between them.

When the ground veneer laminated sheet material of the outer layer material 2 is configured as the large cross-section laminated material 1 for composite structure, the ratio of the outer layer material 2 to the upper and lower outer layers is 8 when the thickness of the whole laminated material is 8. The material 2 is configured to be laminated on the inner layer and the intermediate layer at a ratio of 1/8, respectively. In the embodiment, the ground plate veneer laminated material having a thickness of 27 mm is arranged as the outer layer material 2 on the uppermost surface and the lowermost surface.

On the other hand, the inner layer and the intermediate layer 3 have a constant thickness of 27 mm after cutting a small-diameter tree, bent wood, and thinned wood to a certain length, and have a certain thickness of about 45 degrees on both sides. The trapezoidal shape is laminated in 6 steps so that the top side and the bottom side are alternated, and they are adhered to each other by a 45 ° oblique adhesion surface 4, and further connected in the longitudinal direction (finger join) to a predetermined shape. Laminated wood of length.

Therefore, the total thickness of the large cross section laminated material for composite structure 1 is 216 mm, and the thickness of the inner layer and the intermediate layer 3 is 6 / when the total thickness of the large cross section laminated material for composite structure 1 is 8 / It goes without saying that the ratio is set to 8.

When the strength of the outer layer material 12 of the conventional large cross-section laminated lumber 11 for structure using solid wood is 1, the lumber veneer laminate used for the construction of the large-diameter laminated laminated wood for composite structure 1 of the present invention. It was confirmed that the outer layer material 2 made of the material maintained the strength of 1.75 to 2 times.

[0021]

[Effect of the device]

 As described above in detail, the large cross-section laminated lumber for composite structure configured as in the present invention is laminated vertically and used as an outer layer material Since they are parallel to each other, they have bending rigidity, and therefore, they have excellent bending strength and bending Young's modulus required for structural materials for construction, particularly beam materials. Therefore, it is suitable for use as a beam in a large-scale wooden building.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a structural large-section laminated lumber according to an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view of a conventional structural large-section laminated lumber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Large cross-section laminated wood for composite structure, 2 ... Outer layer material (ground veneer laminated sheet material), 3 ... Inner layer and intermediate layer material, 4 ... 45-degree obliquely bonded surface, 11 ... Conventional large cross-section laminated wood, 12 ... Outer layer material of conventional structural large cross-section laminated wood, 13 ... Inner layer and intermediate layer of conventional structural large cross-section laminated wood

Claims (1)

[Scope of utility model registration request] 1. A trapezoidal material having an upper and lower outer layer material, which is formed by adhering and laminating a plurality of sawdust veneers and has no longitudinally connected portion, as upper and lower outer layers. A large cross-section laminated material for a composite structure, characterized in that a laminated material according to