JPH0757973B2 - Hollow members for construction - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a building hollow member in which a hollow portion is formed by a peripheral wall portion.

(Prior Art) Conventionally, as a hollow member for construction of this type, the actual construction of Shoko 60-184
As seen in Japanese Patent Publication No. 91, a large number of thin wooden plates are laminated and fixed to form a columnar half body having a substantially L-shaped or U-shaped cross section, and both side edges of the columnar half body are inwardly formed. A hollow laminated column formed by bending the adhesive pieces integrally and projecting the adhesive pieces integrally, arranging a pair of assembled column halves in a rectangular tubular shape with the adhesive pieces facing each other and bonding the outer surfaces of the opposing adhesive pieces to each other. There is.

(Problems to be Solved by the Invention) Since the above-described conventional hollow member for construction is made for use as a pillar, there is no problem in using it as a pillar, but When it is used as a beam, there are the following problems.

That is, as is well known, the bending moment diagram when the bending moment M is applied to both ends of the beam AB as shown in FIG. 12 (a) is as shown in FIG. 12 (b). Bending stress is generated on both upper and lower end surfaces of the beam, and becomes compressive stress on the upper surface and tensile stress on the lower surface.

Further, as shown in FIG. 13 (a), the central portion C of the simple support beam AB is
A bending moment diagram when a lateral load P is applied to is shown in (b) of the same figure, and the maximum bending stress at this time occurs on both upper and lower end surfaces of the central portion C of the beam, the upper surface is compressive stress, and the lower surface is Then it becomes tensile stress.

Similarly, the bending moment diagram when a uniform load p is applied to a simple support beam AB as shown in Fig. 14 (a) is as shown in Fig. 14 (b), and the maximum bending stress at this time is also the beam. Occurs on both the upper and lower end surfaces of the central portion C of the above, and becomes compressive stress on the upper surface and tensile stress on the lower surface.

Further, a bending moment diagram when a lateral load P is applied to the central portion C of the fixed beam AB as shown in FIG. 15 (a) becomes as shown in FIG. 15 (b). Depending on the bending rigidity of the beam, the position where it occurs is the central part C or both end faces A,
B is generated on both upper and lower end surfaces of B, and compressive stress is generated on the upper surface of the central portion C.
The lower surface has tensile stress, the upper surfaces of both end surfaces A and B have tensile stress, and the lower surface has compressive stress.

Incidentally, it is well known that the supporting state of these beams and the acting state of the load are examples, and there are various other types.

Now, in such a case, when using the above-mentioned conventional building hollow member, considering that the tensile strength of this kind of material is smaller than the compressive strength, the maximum tensile stress generated in the usage state is It is necessary to design strength as an index.

However, since the conventional building hollow member has a uniform thickness over all parts, when the maximum tensile stress is designed as one index, the wall thickness is increased to a part that is originally unnecessary, There is a problem that the weight of the member becomes larger than necessary. When the weight of the member is increased, not only the design of other parts of the structure is adversely affected, but also the workability is deteriorated.

An object of the present invention is to solve the above-mentioned problems of conventional members, and to provide a hollow building member capable of obtaining a predetermined strength and reducing the weight.

(Means for Solving the Problems) In order to achieve the above object, the building hollow member according to claim (1) is a building hollow member in which a hollow portion is formed by a peripheral wall portion. Only the part of the member with a large required strength is formed thick in the hollow direction,
Further, the peripheral wall portion is formed of a laminated body in which thin single plates are laminated, and the thick portion is formed simultaneously with the peripheral wall portion by laminating the thin single plates.

The building hollow member according to claim (2) is the building hollow member according to claim (1), in which the shape of the thick portion is formed in a shape corresponding to a bending moment diagram of the building hollow member. It is characterized by being.

In addition, "a site | part with a large required strength" here means the site | part which a required strength becomes comparatively large compared with the other site | parts in a hollow member for construction.

(Function and Effect) The hollow building member according to claim 1 has the above-described structure, and therefore has the following function and effect.

That is, since the portion having a large required strength is thick, a predetermined strength can be obtained, and the other portions are not thick, so that the weight is light.

Moreover, since the thickness direction is toward the hollow direction, the appearance does not change even if the internal shape changes, and there is an effect that the aesthetic appearance of the structure is not impaired.

Further, the peripheral wall portion is formed of a laminated body in which thin veneers are laminated, and the thick portion is formed at the same time as the peripheral wall portion by laminating the thin veneers. The hollow member can be easily manufactured.

According to the building hollow member according to claim (2), in the building hollow member according to claim (1), the shape of the thick portion corresponds to a bending moment diagram of the building hollow member. Since it is formed in the above-mentioned structure, in addition to the function and effect obtained by the building hollow member according to the above-mentioned claim (1), a predetermined strength can be obtained more purposefully and the weight can be reduced.

(Example) Hereinafter, the illustrated example will be described.

<Example 1> FIGS. 1 (a), (b) and (c) are a plan view, a side view and a front view with one side wall omitted showing a first example of a building hollow member according to the present invention.

1, 1 is a side wall part, 2 is a bottom wall part, and 3 is a top wall part, which are formed by laminating a plurality of thin veneers 1a, 2a, 3a, respectively. A is a hollow part.

This embodiment is mainly applied to the simple bending or the 13th bending shown in FIG.
It is suitable for the case of simple support shown in the figure, and considering that the tensile strength of this type of material is smaller than the compressive strength, only the bottom wall portion 2 of the hollow portion A is compared with other portions. It is formed to be thick in the direction. The thick portion is formed simultaneously with the peripheral wall portion (bottom wall portion 2 in this embodiment) by laminating the thin single plates (2a in this embodiment). In each of the embodiments described below, the thick portion is formed simultaneously with the peripheral wall portion by laminating thin single plates.

Example 2 FIGS. 2 (a), (b) and (c) are plan views showing the second example,
It is a side view and the front view which abbreviate | omitted one side wall.

This embodiment is mainly suitable for the simple support shown in FIGS. 13 and 14, and in consideration of the fact that the maximum bending stress occurs in the central portion C of the beam, the central portion of the bottom wall portion 2 is considered. Only 2c is formed thicker toward the hollow portion A than other portions. The central portion 3c of the top wall portion 3 may also have a wall thickness as shown by the phantom line in FIG.

According to the present embodiment, compared with the first embodiment, it is possible to obtain a predetermined strength more purposefully and reduce the weight.

<Embodiment 3> FIGS. 3A, 3B and 3C are plan views showing the third embodiment,
It is a side view and the front view which abbreviate | omitted one side wall.

This embodiment is mainly suitable for the simple support shown in FIG. 13, and the bending moment diagram in this case is shown in FIG.
Corresponding to the triangular shape as shown in Fig. 3, the shape of the bottom wall 2 is a triangular shape whose apex faces toward the hollow portion A as shown in Fig. (C), and the central portion 2c is the other It is formed to be thicker than the part. Incidentally, (c)
As shown by the imaginary line in the figure, the top wall portion 3 may also have a triangular shape.

According to the present embodiment, compared with the second embodiment, it is possible to obtain a predetermined strength more purposefully and reduce the weight.

<Embodiment 4> FIG. 4 is a front view in which one side wall of the fourth embodiment is omitted.

This embodiment is mainly suitable for the simple support shown in FIG. 14, and the bending moment diagram in this case is shown in FIG.
Corresponding to the parabolic shape as shown in, the shape of the bottom wall portion 2 is a parabolic shape whose apex faces toward the hollow portion A, and the central portion 2c is thicker than most other portions. Is formed. As shown by the phantom line, the top wall 3
Alternatively, the shape may be parabolic.

According to the present embodiment, like the third embodiment, it is possible to obtain a predetermined strength more purposefully and to reduce the weight as compared with the second embodiment.

<Embodiment 5> FIGS. 5A, 5B and 5C are plan views showing the fifth embodiment,
It is a side view and the front view which abbreviate | omitted one side wall.

This embodiment is mainly suitable for the case where both ends are fixed as shown in FIG. 15, and the bending moment diagram in this case is shown in FIG.
In consideration of such a situation as shown in Fig. 2, the central portion 2c of the bottom wall portion 2 is formed thickly toward the hollow portion A, and both end portions 3d, 3d of the top wall portion 3 are hollow portions. It is formed thick in the direction of A.

<Embodiment 6> FIGS. 6 (a), (b) and (c) are plan views showing a sixth embodiment,
It is a side view and the front view which abbreviate | omitted one side wall.

This embodiment is mainly suitable for the case where both ends are fixed as shown in FIG. 15, and the bending moment diagram in this case is shown in FIG.
Corresponding to the state as shown in FIG. 5, as clearly shown in FIG. 7C, the shape of the central portion of the bottom wall portion 2 is made into a triangular shape whose apex faces toward the hollow portion A, and the central portion 2c is Formed to be thicker than the other parts,
Both end portions 3e, 3e of the top wall portion 3 are also triangular.

According to the present embodiment, compared with the fifth embodiment, it is possible to obtain a predetermined strength more purposefully and reduce the weight.

Example 7 This example shows a modification of the above example.

That is, although the external shape of each of the first to sixth embodiments is a square tube, the present invention is not limited to this, and a triangular tube as shown in FIG. A cylinder as shown in FIG. 2B, a pentagonal cylinder as shown in FIG. 3C, a hexagonal cylinder as shown in FIG. 2D, a substantially cross-shaped cylinder as shown in FIG. The present invention can also be applied to an elliptic cylinder as shown in (f).

Further, as shown in FIG. 8, the axis C is not limited to a linear one, but is also applicable to a crank shape as shown in FIG. 8A and an L-shaped shape as shown in FIG. You can

Furthermore, the lamination direction of thin single plates is not limited to the same direction,
As shown in FIGS. 9 (a) to 9 (o), it can be applied to those formed in different directions.

<Manufacturing Method 1> Thin veneers laminated in the same direction, that is, FIG.
The structure shown in FIG. 7 can be easily prepared by sequentially laminating and fixing each single plate in the same direction. For example, for the one shown in FIG. 1, first, the single plate 1a
Are laminated and fixed to form one side wall portion 1, and then the single plates 2a ... and 3a are laminated and fixed to this side wall portion to form the bottom wall portion 2 and the top wall portion 3, After that, veneer 1a ...
It is possible to form by forming the other side wall by laminating and fixing.

<Manufacturing Method 2> As shown in FIGS. 9 (a) to 9 (o), when the thin veneers have different laminating directions, the thin veneers are first laminated and fixed in the same direction. It can be made by making wall parts and then joining each of these wall parts.

Although the embodiments of the present invention have been described above, in each of the embodiments, a portion having a large required strength is thick, so that a predetermined strength can be obtained, and other portions are not thick, so that the weight is light.

Moreover, since the thickness direction is toward the hollow direction, the appearance does not change even if the internal shape changes, and there is an effect that the aesthetic appearance of the structure is not impaired.

Further, the peripheral wall portion is formed of a laminated body in which thin veneers are laminated, and the thick portion is formed at the same time as the peripheral wall portion by laminating the thin veneers. The hollow member can be easily manufactured.

Further, since the outer shape is a tubular shape such as a square tube, by press-fitting the joint member into the hollow portion A, connection with other members can be made extremely easily and firmly.

FIG. 10 and FIG. 11 show the connection state in the case of a hollow member such as a square.

In these drawings, D is a hollow cylindrical member, A is a hollow portion, and J is a joint member.

As shown in FIG. 10 (a), the joint member J is press-fitted into the hollow portion A of the both square tubular hollow members D, D to be connected, and the two members are easily and firmly bonded by adhering as necessary. Can be connected.

As a result, as shown in FIG. 4B, by connecting a large number of hollow rectangular hollow members D by the joint members J, it is possible to realize an extremely long member that could not be realized conventionally. Moreover, since the member D is a single body before being connected by the joint member J, it is easy to transport to the construction site and carry it into the structure, and the structure can be constructed with suitable workability.

Further, as shown in FIG. 11, both members D, D which are orthogonal to each other can also be connected easily and firmly by using the joint member J.

In such a connected state, the joint member J is housed in the hollow portion A and is not exposed to the outside, so that the appearance is not spoiled.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above embodiments and can be appropriately modified within the scope of the gist of the present invention.

[Brief description of drawings]

1 (a), (b) and (c) are a plan view showing a first embodiment of a building hollow member according to the present invention, a side view, a front view with one side wall omitted, and FIGS. 2 (a) (b). ) (C) is a plan view showing a second embodiment, a side view, a front view with one side wall omitted, and FIGS. 3 (a), (b) and (c) are plan views showing the third embodiment, a side view, A front view in which one side wall is omitted, FIG. 4 is a front view in which one side wall is omitted in FIGS. 4A and 4B, and FIGS. 5A, 5B, and 5C are plan views and side views showing the fifth embodiment. A front view in which one side wall is omitted, FIGS. 6 (a), (b) and (c) are plan views showing a sixth embodiment, a side view, a front view in which one side wall is omitted, and FIGS.
(F) is a partial perspective view showing a modified example, FIGS. 8 (a) and (b) are diagrams showing a front view and a plan view of the modified example at the same time, and FIGS. 9 (a) to 9 (o) are Each is a partial perspective view of a modification different from FIG. 7, FIGS. 10 (a) (b) and FIG. 11 are views showing connection examples of members, respectively, FIGS. 12 (a) (b), FIG. (A) (b), FIG. 14 (a)
(B) and FIG. 15 (a) and (b) are diagrams showing a representative example of a load state on a beam and a bending moment diagram thereof, respectively. A: Hollow part.

Claims (2)

[Claims] 1. A building hollow member in which a hollow portion is formed by a peripheral wall portion, and only a portion of the building hollow member having a large required strength is formed thick in the hollow direction, and the peripheral wall. A hollow member for construction, wherein the portion is formed of a laminated body in which thin single plates are laminated, and the thick portion is formed simultaneously with the peripheral wall portion by laminating the thin single plates. 2. The building hollow member according to claim 1, wherein the thick wall portion is formed in a shape corresponding to a bending moment diagram of the building hollow member.