JP7003380B2 - 3D truss frame - Google Patents

Description

The present invention relates to a three-dimensional truss frame.

A three-dimensional truss frame that connects two upper chords and one lower chord with diagonal lumber is known. In this three-dimensional truss frame, the lower end of the slant is joined to the lower chord at an angle, so compared to a flat truss frame that connects one upper chord and one lower chord with the slant, the slant is used. The shape of the lower end of the lumber tends to be complicated. In order to solve this problem, for example, Patent Document 1 discloses a truss beam structure in which a lower chord member and a lower end portion of a diagonal member are joined via a steel block.

Japanese Patent Application Laid-Open No. 2002-4414

However, in the truss beam structure disclosed in Patent Document 1, it is necessary to weld a steel block to the lower chord material, and it is necessary to machine a screw hole or the like at the lower end portion of the diagonal material. It was not easy to connect with the diagonal lumber.

In view of the above facts, an object of the present invention is to provide a three-dimensional truss frame capable of easily connecting a lower chord member and a diagonal member.

The three-dimensional truss frame according to the first aspect connects a pair of upper chord members, a lower chord member provided below the upper chord member and having a polygonal cross section, and the pair of upper chord members and the lower chord member. It has an oblique member joined to the outer peripheral plane of the lower chord member.

According to the above configuration, the cross section of the lower chord member has a polygonal shape, and the diagonal member is joined to the outer peripheral plane of the lower chord member. Therefore, the shape of the lower end surface of the slanted lumber, which is the joint portion, can be made flat, and the connection between the lower chord member and the slanted lumber becomes easy.

The three-dimensional truss frame according to the second aspect is the three-dimensional truss frame according to the first aspect, and the outer peripheral plane of the lower chord member is orthogonal to the central axis of the diagonal member.

According to the above configuration, since the outer peripheral plane of the lower chord member is orthogonal to the central axis of the diagonal member, it is not necessary to cut the lower end surface of the lower chord member diagonally according to the angle of the outer peripheral plane of the lower chord member, and the lower chord member does not need to be cut diagonally. And the diagonal material will be easier to connect.

The three-dimensional truss frame according to the third aspect is the three-dimensional truss frame according to the first aspect or the second aspect, the cross section of the upper chord member has a polygonal shape, and the diagonal member is on the outer peripheral plane of the upper chord member. It is joined.

According to the above configuration, since the cross section of the upper chord material is also polygonal as well as the lower chord material, it is easy to process the upper end surface and the lower end surface of the diagonal material, and the upper chord material and the diagonal material, and the lower chord material and the diagonal material are used. Each can be easily connected.

According to the present invention, the lower chord member and the diagonal member can be easily connected.

It is an overall view which shows the three-dimensional truss frame in 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line AA in FIG. It is sectional drawing corresponding to FIG. 2 which shows the three-dimensional truss frame in 2nd Embodiment. (A) and (B) are cross-sectional views corresponding to FIG. 2 showing a three-dimensional truss frame in a modified example.

<First Embodiment>
Hereinafter, the three-dimensional truss frame according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the three-dimensional truss frame 10 of the present embodiment includes a plurality of upper chord members 12 arranged in parallel at intervals from each other, and the upper chord members 12 provided below the upper chord members 12. It has a plurality of lower chord members 14 extending in parallel.

The three-dimensional truss frame 10 of the present embodiment is used as a roof frame of a structure such as a stadium, for example, and as an example, as shown in FIG. 1, one end of the upper chord member 12 and the lower chord member 14 is connected by a connecting member 16. It is cantilevered by a lower structure 18 such as a spectator seat.

As shown in FIG. 2, the upper chord member 12 is composed of, for example, a hollow steel pipe having a regular square cross section, and has four outer peripheral planes 12A. Similarly, the lower chord member 14 is also made of a hollow steel pipe having a regular square cross section, and has four outer peripheral planes 14A. In the present embodiment, the outer dimensions of the lower chord member 14 and the outer dimensions of the upper chord member 12 are the same size.

Further, the adjacent upper chord members 12 are connected to each other by the horizontally extending beam members 20, and the lower chord members 14 are also connected to the adjacent lower chord members (not shown) by the horizontally extending beam members 22. There is. The beam members 20 and 22 are made of, for example, a hollow steel pipe having a circular cross section, and in the present embodiment, the outer dimensions (diameter) are smaller than the outer dimensions of the upper chord member 12 and the lower chord member 14.

Further, as shown in FIGS. 1 and 2, a pair of upper chord members 12 and one lower chord member 14 are connected to each other by a plurality of diagonal members 24, and the pair of upper chord members 12, lower chord members 14, and beams are connected to each other. A three-dimensional truss having a triangular cross section is formed by the lumber 20 and the slant 24. The diagonal member 24 is made of, for example, a hollow steel pipe having a circular cross section, and in the present embodiment, the outer dimension (diameter) is smaller than the outer dimensions of the upper chord member 12 and the lower chord member 14.

Here, as shown in FIG. 2, in the upper chord member 12 and the lower chord member 14, the outer peripheral planes 12A and 14A are arranged in directions orthogonal to the central axis P of the diagonal member 24, respectively, and above the diagonal member 24. The end surface is joined to the outer peripheral flat surface 12A of the upper chord member 12, and the lower end surface of the diagonal member 24 is joined to the outer peripheral flat surface 14A of the lower chord member 14. Examples of the joining method between the upper end surface and the lower end surface of the diagonal member 24 and the outer peripheral planes 12A and 14A of the upper chord member 12 and the lower chord member 14 include joining by welding and joining by bolts.

According to the present embodiment, the cross sections of the upper chord member 12 and the lower chord member 14 have a regular four-shaped cross section, and the diagonal member 24 is joined to the outer peripheral planes 12A and 14A of the upper chord member 12 and the lower chord member 14, respectively. Therefore, the shapes of the upper end surface and the lower end surface of the diagonal member 24, which is the joint portion, can be made flat, respectively, and the upper end surface and the lower end surface of the diagonal member 24 can be easily processed, and the upper chord member 12 and the diagonal member 12 are inclined. The material 24 and the lower chord material 14 and the diagonal material 24 can be easily connected.

In particular, in the present embodiment, since the outer peripheral planes 12A and 14A of the upper chord member 12 and the lower chord member 14 are orthogonal to the central axis P of the diagonal member 24, the upper end surface and the lower end surface of the diagonal member 24 are the upper chord member 12 and the lower chord member. It is not necessary to cut diagonally according to the angles of the outer peripheral planes 12A and 14A of 14, and the connection between the upper chord member 12 and the diagonal member 24 and the lower chord member 14 and the diagonal member 24 becomes easier.

Further, according to the present embodiment, since the lower chord member 14 which is particularly susceptible to compressive force is formed of a hollow steel pipe and has a closed cross section, it is compared with a configuration in which the lower chord member 14 does not have a closed cross section. , Buckling of the lower chord member 14 can be suppressed.

<Second Embodiment>
Next, the three-dimensional truss frame according to the second embodiment of the present invention will be described with reference to FIG. The illustration and description of the same configuration as that of the first embodiment will be omitted.

As shown in FIG. 3, in the three-dimensional truss frame 30 of the present embodiment, the upper chord member 32 is made of H-shaped steel as an example. On the other hand, the lower chord member 34 is composed of a hollow steel pipe having a rhombic cross section, and the outer peripheral plane 34A is arranged in a direction orthogonal to the central axis Q of the diagonal member 36.

The upper end surface of the diagonal member 36 is joined to the lower surface 32A of the lower flange of the upper chord member 32, and the lower end surface is joined to the outer peripheral flat surface 34A of the lower chord member 34. , The lower chord member 34, and the diagonal member 36 form a three-dimensional truss with a triangular cross section. The adjacent upper chord members 32 and the lower chord members 34 are also connected to each other by the beam members 38 and 40 as in the first embodiment.

According to the present embodiment, the cross section of the lower chord member 34 has a rhombic shape, and the diagonal member 36 is joined to the outer peripheral plane 34A of the lower chord member 14. Therefore, as in the first embodiment, the shape of the lower end surface of the diagonal member 36, which is the joint portion, can be made flat, the lower end surface of the diagonal member 36 can be easily processed, and the lower chord member 34 and the lower chord member 34 can be easily processed. The connection with the diagonal member 36 becomes easy.

Further, since the cross section of the lower chord member 34 is rhombic, it is easy to adjust the angle of the outer peripheral plane 34A according to the distance between the upper chord members 32, that is, the angle of the central axis Q of the diagonal member 36, and the outer peripheral plane. The direction of 34A can be oriented orthogonal to the central axis Q of the diagonal member 36.

<Other embodiments>
Although the first embodiment and the second embodiment of the present invention have been described above, the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention. ..

In the first embodiment, the cross section of the lower chord member 14 has a regular square shape, and in the second embodiment, the cross section of the lower chord member 34 has a rhombic shape. However, the lower chord members 14 and 34 may have at least a plurality of outer peripheral planes 14A and 34A to which the lower end surfaces of the diagonal members 24 and 36 are joined.

For example, as shown in FIG. 4A, the cross section of the lower chord member 44 may be triangular, and the lower end surface of the diagonal member 46 may be joined to two of the three outer peripheral planes 44A. Further, as shown in FIG. 4B, the cross section of the lower chord member 54 may be pentagonal, and the lower end surface of the diagonal member 56 may be joined to two of the five outer peripheral planes 54A.

Further, in the first embodiment and the second embodiment, the outer peripheral planes 12A, 14A, 34A of the upper chord member 12 and the lower chord member 14, 34 and the central axes P, Q of the diagonal members 24, 36 are orthogonal to each other. However, it does not necessarily have to be orthogonal, and the outer peripheral planes 12A, 14A, 34A of the upper chord member 12 and the lower chord members 14, 34 and the diagonal members 24, 36 may be joined at an angle other than 90 degrees.

10 Three-dimensional truss frame 12, 32 Upper chord material 12A Outer plane plane 14, 34, 44, 54 Lower chord material 14A, 34A, 44A, 54A Outer outer plane 24, 36, 46, 56 Oblique material P, Q Central axis

Claims (2)

A pair of upper chords and
A beam member connecting the pair of upper chord members and
A lower chord material provided below the upper chord material and having a square cross section,
The pair of upper chord members and the lower chord members are connected to each other, and the lower ends thereof are joined to adjacent outer peripheral planes of the lower chord members, respectively. A pair of first diagonal members forming a truss with girders,
A pair of second diagonal members that are inclined in the longitudinal direction of the lower chord member and connect the lower chord member and the pair of upper chord members, respectively.
Have,
The outer peripheral plane of the lower chord member is orthogonal to the central axis of the first diagonal member to which the lower end portion is joined to the outer peripheral plane.
A plurality of the trusses are formed in the longitudinal direction of the pair of the upper chord members and the lower chord members, and the three-dimensional truss is formed by the pair of the upper chord members, the lower chord members, and the pair of the second diagonal members.
Three-dimensional truss frame. The three-dimensional truss frame according to claim 1, wherein the cross section of the upper chord member has a polygonal shape, and the first diagonal member is joined to the outer peripheral plane of the upper chord member.

Images