JPH07229207A - Chord member having solid truss screw end - Google Patents

Abstract

PURPOSE:To facilitate assembly work providing non-screwing sections and pipe screwing female sections to the insides of one end of a pipe, and providing male screw sections screwing the pipe screwing female sections to an end cone to connect. CONSTITUTION:Non-screwing sections 2 having non-screwing sections 2 to the insides of both ends of a pipe 1 and pipe screwing female screw sections 3 adjacent to the intermediate side of the pipe are formed in succession. After that, cylindrical bodies 18 are provided to the rear of an end cone 6 having a bolt inserting through-hole in the central part thereof, male screw sections 7 are provided to the rears of the outsides of the cylindrical bodies 18, and spring rear metal fixtures 20 are fixed to the rear ends of the cylindrical bodies 18 to form chord members 28. When the chord members 28 are used to build up a solid truss, a male screw 22 of a bolt 5 in the chord members 28 is contacted with a screw hole 25 of a node 4 to turn a turning cylinder body 14 and, at the same time, the bolt 5 is turned to screw the male screw 22 in the node 4. Accordingly, the solid truss can be assembled at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chord member having a screwed end for use in constructing a truss-like building structure having a large space.

[0002]

2. Description of the Related Art Conventionally, as a chord member having a threaded end portion for a space truss, as shown in FIGS. 8 and 9, at the end portion of a pipe 8, from the end edge of the pipe 8 to a predetermined length, The female screw portion 9 is provided, and the male screw portion 1 is provided over substantially the entire length of the outer surface of the cylindrical body 11 that is connected to the end cone 10.
2 and 6 of bolts 5 inserted through the end cone 10
A turning cylinder 14 having a hexagonal inner surface is fitted into the corner portion 13, and a bolt pushing spring 15 is engaged with the bolt 5.
Further, it is known that the bolt 5 is rotated by the rotating cylinder 14 and the bolt 5 is screwed into the substantially spherical node 4.

[0003]

In the case of the above-mentioned conventional chord member 16 having a threaded end portion for a space truss, a female screw 9 is also provided on the end edge side of the pipe 8, and the female screw portion 9 is provided with an end cone 10. Since it is screwed into the male screw portion 12 provided on the outer peripheral surface of the cylindrical body 11, when a tensile force or a compressive force is applied to the end cone 10 and the pipe 8, FIG.
As shown in FIG. 5, the end of the pipe 8 is expanded and deformed, which reduces the strength of the chord member 16.

[0004]

In order to advantageously solve the above-mentioned problems, in a chord member having a threaded end portion for a space truss of the present invention, a non-threaded portion 2 is provided inside one end portion of a pipe 1. A pipe threading female thread portion 3 is provided adjacent to the pipe intermediate side of the non-threading portion 2, and the pipe threading female thread portion 3 is screwed onto an end cone 6 fixed to a node 4 by a bolt 5. A matching male screw portion 7 is provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIGS. First, a non-threaded portion 2 having a non-threaded female thread 29 inside at both ends of a pipe 1 made of steel, aluminum or stainless steel having a circular cross section, and a pipe screw adjacent to the pipe intermediate side of the non-threaded portion 2. A cylindrical body made of steel, aluminum, or stainless steel at the rear of the end cone 6 made of steel, aluminum, or stainless steel, which is continuously provided with the internal female screw portion 3 and has a through hole 17 for bolt insertion in the central portion. 18 are continuously provided, a male screw portion 7 is provided on the rear portion of the outer surface of the cylindrical body 18, and a female screw portion 3 for pipe screwing is provided on the front portion of the outer surface of the cylindrical body 18.
A cylindrical surface 19 having a diameter slightly larger than the top of the screw thread is provided.

Steel cylinder 1 in the end cone 6
A spring receiving metal fitting 20 is fixed to the rear end portion of 8, and an elastic body or a coil spring 15 is interposed in a compressed state between the spring receiving metal fitting 20 and the head portion 21 of the steel bolt 5.
A hexagonal part 13 is provided in the middle part of the above, and a male screw 22 having a smaller diameter than the hexagonal part 13 is provided in the front part of the bolt 5.

The hexagonal hole 23 of the steel rotating cylinder 14 is fitted into the hexagonal portion 13 of the bolt 5 projecting from the end cone 6, and the outer surface of the rotating cylinder 14 is provided with a wrench such as a spanner. A hexagonal outer surface 24 for engaging a moving tool is provided, and the male screw 22 of the bolt 5 projects from the front end portion of the rotating cylinder body 14.

The spherical steel, aluminum, or stainless steel node 4 is provided with a plurality of screw holes 25 extending toward the center of the node 4. In addition, a push screw 26 is attached to the end cone 6 to prevent the rotation of the bolt 5.
Are screwed together.

When assembling a space truss using the chord member 28 of the first embodiment, the tip of the male screw 22 of the bolt 5 of the chord member 28 is brought into contact with the screw hole 25 of the node 4, and then a spanner or the like. With the rotating tool, the rotating cylinder 1
4 is rotated, the bolt 5 is rotated by the rotating cylinder 14, and the male screw 22 of the bolt 5 is screwed into the screw hole 25 of the node 4.

FIGS. 6 and 7 show a second embodiment of the present invention, in which end cones 6 are provided at both ends of the pipe 1.
The non-threaded portion 2 having a cylindrical surface slightly larger in diameter than the male threaded portion 7 provided on the outer surface of the cylindrical body 18 is provided, and is adjacent to the pipe intermediate side of the non-threaded portion 2 of the pipe 1. Although the internal thread portion 3 for pipe screwing is provided, other configurations are the same as in the case of the first embodiment.

[0011]

According to the present invention, the non-threaded portion 2 is provided inside one end of the pipe 1, and the female threaded portion 3 for pipe threading is provided adjacent to the pipe intermediate side of the non-threaded portion 2. Provided,
End cone 6 fixed to node 4 with bolts 5
And a male screw portion 7 into which the female screw portion 3 for screwing the pipe is screwed.
Since the pipe is provided, the non-threaded portion 2 at the end of the pipe 1 is provided.
However, it is not expanded by the male screw portion 7 of the end cone 6, so that the strength of the chord member 28 can be increased. Further, since the pipe 1 and the end cone 6 can be joined only by thread cutting without joining them by welding, the space truss can be easily assembled at low cost even for a material that is difficult to weld.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a part of a space truss according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a part of FIG. 1 in an enlarged manner.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is an end cone 6 and a pipe 1 in the first embodiment.
It is a vertical side view showing the relationship with.

FIG. 6 is a vertical sectional side view showing a part of a space truss according to a second embodiment of the present invention.

FIG. 7 is an end cone 6 and a pipe 1 according to the second embodiment.
It is a vertical side view showing the relationship with.

FIG. 8 is a vertical sectional side view showing a part of a conventional space truss.

FIG. 9 is a vertical cross-sectional side view showing a state in which a pipe in a conventional space truss is enlarged and deformed by an end cone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Non-threaded part 3 Female threaded part for pipe threading 4 Node 5 Bolt 6 End cone 7 Male threaded part 13 6 Corner part 14 Rotating cylinder 15 Elastic body 17 Bolt insertion through hole 18 Cylindrical body 19 Cylindrical surface 20 Spring receiving Metal fitting 21 Head 22 Male screw 23 Hexagonal hole 24 Hexagonal outer surface 25 Screw hole 26 Push screw 28 String material 29 Non-threaded female screw

Claims (1)

[Claims] 1. A non-screwed portion 2 is provided inside one end of a pipe 1.
A pipe threading female thread portion 3 is provided adjacent to the pipe intermediate side of the non-threading portion 2, and the pipe threading female thread portion 3 is screwed onto an end cone 6 fixed to a node 4 by a bolt 5. A chord member having a threaded end portion for a space truss provided with a matching male screw portion 7.