JP2003200404A - Method for bending material and the bending material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bend lumber by a small bending stress. <P>SOLUTION: Laminar lumbers 1, 2, 3 and 4 are laminated and the laminar lumbers situated on both sides of the laminated surfaces 5, 6 and 7 are joined with joining materials 9, 9 expanding in a wedge shape inside the laminar lumbers situated on the both sides to obtain a composite lumber 10. The composite lumber 10 is bent by applying a stress in a direction crossing at right angles the laminated surface to the composite lumber 10. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mainly bending wood to obtain a beam curved in an arc shape, a core material for a wall surface or a roof, and a composite material which enables such bending. It is a thing.

[0002]

In order to manufacture a window having an arc-shaped edge, a wall having a cylindrical surface, a ceiling, a roof and the like from wood, a curved square bar is necessary. Further, when these are made of concrete, a mold having such a shape is necessary. However, heretofore, there has been no suitable method for bending a lumber into a desired shape at a construction site.
Therefore, the present invention provides a prismatic wood with a composite wood that can be easily bent in a direction orthogonal to the wood while maintaining a sufficient bending strength in one direction, and using the same. This is an attempt to produce a wooden structure.

[0003]

The composite material according to the present invention is one in which a required number of plate-shaped materials having a required length are stacked and adjacent materials are bonded to each other by a bonding material over the entire length thereof. When viewed from the stacking surface of adjacent materials, this binder opens in a wedge shape into the material on both sides,
When pushing the bonding material into the respective stacking surfaces from the end faces of the stacked materials, the materials on both sides can be bonded to each other at this stacking surface.

Although the desirable end face shape of the binder is X-shaped, it is possible to use a suitable combination of a pair of V-shaped materials, a combination of flat plate materials and V-shaped cross-section materials, hourglass-shaped cross-section materials, and the like. A metal such as iron or aluminum or a synthetic resin is suitable as a material used for this.

The above-mentioned composite material exhibits a bending strength equal to or higher than that of a square bar having the same cross-sectional dimension with respect to a bending load in a direction parallel to the stacking surface, which is considered to be because the fragile knot portions are dispersed. . The bending strength in the direction orthogonal to this can be reduced according to the number of stacked sheets.

Therefore, the above-mentioned composite material is transported to a construction site, and is bent by applying a bending load in a direction orthogonal to the stacking surface for use. As a means to keep the composite material in a curved state, a method of fixing both ends to columns or the like located on both sides of the composite material, a method of holding both ends of the composite material with a turnbuckle, a method of bonding to each stacking surface of the composite material An appropriate method such as a method of injecting the agent is selected and used according to the use place of the composite material.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numerals 1, 2, 3, and 4 denote stacked plate-like woods, and reference numerals 5, 6, and 7 denote stacking surfaces between plate-like woods. On the stacking surface of each plate-like wood, as shown in FIG. 2, the grooves 8, 8 ...
3 has been cut in advance and stacked each plate-shaped wood
The binding material 9 of the X-shaped aluminum molded product shown in (1) is inserted from the wood mouth across the grooves 8, 8 of plate-like wood located on both sides of the stacking surface, and the composite wood 10 of Example 1 is obtained. Complete.

FIG. 4 shows a method for testing composite wood according to the present invention. 40 mm x 40 m by stacking three plate-shaped cedar materials and connecting them using the four aluminum connecting members shown in FIG.
A sample 11 of mx 640 mm was manufactured, supported by fulcrums 12 and 13 with a spacing of 560 mm, and a load from the direction orthogonal to the stacking surface indicated by arrow 14 and the direction orthogonal to arrow 14 was applied to break it. The amount of displacement and the bending strength leading to fracture were measured. The measurement results are shown in Table 1. In addition,
The * mark indicates the one that was not destroyed.

[0009]

[Table 1]

As a comparative sample, 40 mm × 40 mm
Table 2 shows the results of a similar test conducted on an ordinary cedar square of × 640 mm.

[0011]

[Table 2]

As is clear from the above-mentioned test results, the composite wood according to the present invention has a bending Young's modulus when the load is applied in the direction of the arrow 14 as compared with the case where the load is applied in the direction orthogonal to the arrow 14. It was found that the amount was as small as about 1/4 and the amount of bending, that is, the amount of displacement was about twice as large. It was also found that the composite material according to the present invention has a bending Young's modulus as small as about 1/3 and a displacement amount as large as about twice as large as that of a normal square member. The curve of the curve was close to an accurate arc. Therefore, since the composite wood according to the present invention can be largely curved with a relatively small load, it can be easily curved at a construction work site or the like.

FIGS. 5 and 6 show an example of a method for bending the composite wood 10 described above. Composite wood 1 as shown in FIG.
Bolt holes 51, 5 at both ends of each plate member 1, 2, 3, 4.
The bolt holes 2, 53, 54 are drilled, and these bolt holes are long in the longitudinal direction of the plate-shaped member 1 and are shortened toward the plate-shaped member 4. Eye bolts 55 in these bolt holes
Insert the nut 56, and then attach the eyebolts 5 at both ends.
When the turnbuckle 57 connected between the 5 and 5 is tightened, the composite wood 10 is bent as shown in FIG.
Moves within each bolt hole 51, 52, 53, 54. If you don't mind leaving the turnbuckle 57 on the building,
As shown in FIG. 7, both ends of the composite wood 10 are inserted into the bracket portions 59 of the mounting bracket 58, and the mounting portion 60 of the mounting bracket 58 is inserted.
Is attached to the fixing member 61 of the building. If the fixing member 61 has sufficient strength, the turnbuckle 57 may be removed here.

In order to remove the turnbuckle 57, small holes 62, 62 ... Are punched in the stacking surfaces 5, 6, 7 from the side of the composite wood 10 as shown in FIG. Inject the adhesive into the surfaces 5, 6, 7. After the adhesive is solidified, the composite wood 10 maintains the curved state even if the turnbuckle 57 is removed.

FIG. 8 shows a different embodiment of the engaging material. Figure 8
In the above, the plate-like woods 1, 2, 3, 4 are connected to each other at their stacking surfaces 5, 6, 7 by the flat plate-like connecting members 81-86 and the V-shaped connecting members 87-92.
For example, when viewed from the stacking surface 5, the binding materials 81 and 87 and 82 and 88 are spread like wedges in the plate-like woods 1 and 2 located on both sides, so that the plate-like woods 1 and 2 can be combined. Similarly, in the other stacking surfaces 6 and 7, the plate-like woods located on both sides of the stacking surfaces 6 and 7 can be connected to each other.
Further, even if a pair of V-shaped connecting members are used in a back-to-back state, a similar wedge-shaped expansion can be obtained, so that they can be used for connecting plate-shaped wood.

FIG. 9 further shows another example of the bonding material. In the stacking surfaces 5, 6 and 7, the plate-like woods on both sides of the bonding surface are bonded by a drum-shaped bonding material 93. This bonding material has the narrowest width on the stacking surfaces 5, 6, and 7, and widens in a wedge shape toward both ends.

In the above embodiment, wood was used as the plate-like material to be stacked, but a part of it can be replaced with another kind of material such as metal, synthetic resin, rubber, wood working material and the like.
Further, as the binding material, other than metal, an appropriate material such as synthetic resin, bamboo or wood can be used.

For example, in the case of a long material used for a ceiling or a roof, each plate-shaped wood is struck with each other on the way 15,
Since there can be used those which have been subjected to 15 ..., There is no restriction on the length of the composite wood. The strengths of sample Nos. 6 to 10 shown in Table 1 are far superior to those of the ordinary timbers shown in Table 2. However, in the ordinary timbers, the influence of weak points such as knots is significant, whereas the composite timbers are The weak points are dispersed, so the effect is small. Therefore, by arranging them so that the abutting parts, which are considered to be a type of weakness, do not overlap, it is possible to reduce the effect when looking at the composite wood as a whole, and it is possible to obtain long composite wood with high strength. Of.

[0019]

As described above, according to the present invention, it is possible to obtain a composite lumber that can be easily bent even at a construction site. , It becomes possible to perform a novel design.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a plate-like material used in the embodiment shown in FIG.

FIG. 3 is a perspective view of a bonding material used in the embodiment shown in FIG.

FIG. 4 is a perspective view of a composite material test apparatus according to the present invention.

FIG. 5 is a front view showing one step of a bending method for a composite material according to the present invention.

6 is a front view showing a bending completion process of the bending method shown in FIG.

FIG. 7 is a cross-sectional view showing a method of attaching a curved composite material according to the present invention.

FIG. 8 is an end view showing an example of the bonding material of the present invention different from that of FIG.

FIG. 9 is an end view showing still another example of the binder in the present invention.

FIG. 10 is a side view of the long composite material according to the present invention.

[Explanation of symbols]

1-4 plate material 5-7 Stacking surface 8 notch 9 Binder 10 Composite material 15 Alignment

Claims (10)

[Claims] 1. A required number of plate-shaped materials are stacked, and the adjacent materials are joined over their entire length by a binder that opens in a wedge shape toward the material on both sides as viewed from the stacking surface. A material for bending that is characterized in that 2. The lumber for bending according to claim 1, wherein each of the binders has an X-shaped cross section. 3. The bending material according to claim 1, wherein each of the bonding materials is a molding material having a pair of cross-sections arranged back to back and having a dogleg shape. 4. The material for bending according to claim 1, wherein each of the binding materials is formed of a pair of molding materials having a flat plate shape and a V-shaped cross section. 5. The material for bending according to claim 1, wherein each of the binders has an hourglass-shaped cross section in which the wall thickness is thinnest in the central portion and becomes thicker toward both side edges. 6. The plurality of plate-shaped materials according to claim 1, wherein a plurality of the plate-shaped materials are arranged so that a material having a relatively short size has a required length in a state where the ends thereof collide with each other. The required number of sheets are stacked, and the materials having the required lengths are subjected to the above-mentioned abutting of the ends at different positions, and the bending material. 7. A required number of branch-shaped materials are stacked, and adjacent materials are joined to each other over their entire length by a binder that opens in wedge-like shape into the materials on both sides as viewed from the stacking surface. A method of bending a material, characterized in that the composite material is bent by applying a load in a direction orthogonal to the stacking surface. 8. The material bending method according to claim 7, wherein both ends of the curved composite material are held by metal brackets. 9. The method for bending a material according to claim 7, wherein an adhesive is injected into the stacking surface of the curved composite material. 10. The method of bending a material according to claim 7, wherein tension metal fittings for maintaining a curved state are attached between both ends of the curved composite material.