JPH0647042Y2 - Truss bar for three-dimensional structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a truss bar used when constructing a three-dimensional structure such as a plane truss or a space truss.

[Prior Art] A three-dimensional structure is generally configured by connecting a large number of truss bars having joint members including bolts at their ends to nodes.

The truss bar is usually one in which joint members are provided on both ends of a circular pipe or a rectangular tubular pipe body as a pipe material.

Steel pipes, aluminum, and synthetic resins are used as the material of the pipe material, but when aluminum or synthetic resin is used, it is difficult to weld the joint member to the pipe material.

Therefore, if a steel pipe that can be welded is used, rust may occur. Therefore, hot dip galvanizing is applied to prevent rusting of the pipe body.

However, if the pipe body is plated with the joint member still attached, there is a problem that the plating adheres to the threaded portion of the bolts that make up the joint member, so the joint member is welded to the pipe body after the pipe body is plated. .

Further, when connecting a bolt constituting a joint member to the end of the pipe material, for example, as disclosed in Japanese Utility Model Publication No. 52-22992, a large circular or oval assembly hole is formed in the body portion of the pipe material. There is known a type in which a bolt is inserted into an end portion side of a pipe material with a finger or the like through the assembly hole.

[Problems to be Solved by the Invention] However, in the structure in which the joint member is welded to the pipe body which is the plated pipe material, zinc vapor is generated from the galvanized portion, which is harmful to the welding operator.

Further, after the joint member is welded, a post-treatment such as a welded portion is performed, but there is a problem in that it cannot be formed cleanly in appearance.

Further, a truss bar of a type in which an assembly hole is bored in a pipe material and a bolt is inserted through the assembly hole has a problem in that the strength of the assembly hole portion is lowered, the appearance is impaired, and rainwater enters.

Therefore, the purpose of the present invention is that the joint member can be attached and detached regardless of the galvanization of the pipe body, which is the pipe material, and the appearance is smart,
The purpose of the present invention is to provide a truss bar for a three-dimensional structure that is strong and does not allow rainwater to enter.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention has a three-dimensional structure in which a joint member is provided at an end of a pipe material and the joint member is connected to a node to form a three-dimensional structure. In the trans bar for
The joint member is composed of a bolt having a flange at the base end of the main body, and a sleeve that is inserted into the outer periphery of the main body of the bolt so as to be movable in the axial direction. The end of this pin is movably inserted into the long hole formed in the sleeve, the proximal end of the bolt is movably inserted into the end of the pipe through the flange, and it is detachably fixed inside the end of the pipe. It is characterized in that the flange is prevented from coming off by the stopper.

[Operation] When the sleeve is rotated, the bolt also integrally rotates via the pin, and the bolt also moves in the axial direction along the elongated hole, and the flange comes into contact with the stopper at the maximum stroke to prevent the bolt from coming off.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

An example of a three-dimensional structure A that is a three-dimensional truss is shown in FIG.

This is a structure in which the truss bar 1 according to the present invention is assembled vertically and horizontally and diagonally via a node 2 to form a structure A which is, for example, a three-dimensional truss.

The truss bar 1 is formed of a pipe material 3 as a pipe body and joint members 4 provided at both ends or one end of the pipe material 3.

The pipe material 3 is formed into a circular pipe or a square pipe by using a metal such as a steel pipe or aluminum or a synthetic resin as a material.

In the circular tubular material 3 formed of the steel pipe of this embodiment,
Before mounting the joint member 4, hot dip galvanizing is applied to the outer circumference or the outer circumference and the inner circumference in advance.

The joint member 4 is composed of a bolt 5 and a sleeve 6 which is axially movably inserted into the outer periphery of the bolt 5.

The bolt 5 has a main body 7, a flange 8 provided at one end of the main body 7, and a threaded portion 9 formed at the other end, and a pin 11 planted in a hole 10 of the main body 7 extends along the axial direction formed in the sleeve 6. Long hole 12
Is plugged into.

One or a plurality of spanner engaging surfaces 13 are formed on the outer periphery of the sleeve 6, and when the sleeve 6 is rotated through the spanner, the pin 11
As a result, the bolt 5 also rotates integrally, and the bolt 5 can be moved in the axial direction by the length of the long hole 12.

The base end portion of the bolt 5 on the flange 8 side is inserted into the end portion of the pipe material 3, and a stopper 15 made of a snap ring, a C-shaped elastic washer, or the like is provided in an annular groove 14 provided on the inner circumference of the end portion of the pipe material 3. It is installed. For this reason, when the bolt 5 strokes to the maximum outward, the end surface of the flange 8 is locked by the stopper 15 to prevent the bolt 8 from coming off.

The sleeve 6 is provided with a small diameter portion 6a at the end and a flange portion 16 at a position close to the small diameter portion 6a. In this case, the small diameter portion 6a is fitted to the inner circumference of the end portion of the pipe material 3, and the flange portion 16 is formed so as to match the outer circumference of the pipe material 3.

The outer diameter of the sleeve 6 is preferably formed to be equal to the diameter of the engagement surface 2a of the node 2. In particular, since the outer diameter of the flange 16 has various thicknesses of the pipe material 3, it is preferable to prepare various materials having an outer diameter corresponding to the thickness of each of the pipe materials 3. For example, FIG. 3 shows one having collars 16 and 16 'having different diameters.

The node 2 has a large number of screw holes 18 formed in the radial direction on the outer circumference of a spherical or polygonal main body 17.

To attach the truss bar 1 to the node 2, attach the tip of the bolt 5 to the screw hole of the node 2 as shown in FIG.
When the sleeve 6 is slightly inserted into 18 and then the sleeve 6 is rotated with a wrench or the like, the bolt 5 is rotated through the pin 11, and the screw 9 of the bolt 5 is screwed into the screw hole 18 of the node 2. At this time, the bolt 5 is elongated hole 12 Stroke axially along.

One end of the sleeve 6 abuts on the engaging surface 2a of the node 2, and a stopper 15 is sandwiched between the small diameter portion 6a and the flange 8 of the bolt 5, and the stopper 15 engages with the annular groove 14 of the pipe member 3. Be combined.

[Effect of the Invention] According to the present invention, the following effects are obtained.

Since the proximal end side of the bolt is inserted into the pipe material through the flange and the flange is prevented from coming off through the stopper, it is not necessary to weld the joint member to the pipe material, and thus the pipe material is galvanized. Even if the pipe material and the joint member are joined together, zinc vapor is not generated and it is harmless.

Similarly, since the pipe material and the joint member are not joined by welding, there is no need for post-treatment after welding as in the past, and the appearance is beautiful.

The bolt is inserted into the pipe material through the flange, and the flange is retained by the stopper, so the bolt and the sleeve around it can be easily attached to and detached from the pipe material by attaching and detaching the stopper. Even afterwards, the joint member can be replaced and repaired by attaching and detaching the stopper.

The base end side of the bolt can be attached to and detached from the end of the pipe material via the flange, and it is not necessary to provide a hole for mounting the bolt on the side portion of the pipe material. Therefore, it is possible to prevent water from penetrating into the pipe material from the side and reduce the strength, and the appearance is beautiful.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view of a truss bar according to the present invention, FIG. 2 is an exploded perspective view of a joint member, FIG. 3 is a partially cutaway sectional view in a state of being connected to a node, and FIG. 4 is the present invention. 3 is a perspective view of a three-dimensional structure using the truss bar of FIG. [Explanation of symbols] 2 ... node, 3 ... tube material 4 ... joint member, 5 ... bolt 6 ... sleeve, 8 ... flange 11 ... pin, 12 ... long hole 15 ... stopper, 16 , 16 '…… Tsuba A …… Three-dimensional structure

Claims (5)

[Scope of utility model registration request] 1. A three-dimensional structure transbar in which a joint member is provided at an end of a pipe material and the joint member is connected to a node to form a three-dimensional structure. The joint member has a flange at the base end of the main body. It consists of a bolt provided and a sleeve that is inserted into the outer circumference of the body of the bolt so as to be movable in the axial direction. The base end side of the bolt is movably inserted into the end of the pipe material through the flange, and the flange is prevented from coming off with a stopper that is detachably fixed inside the end of the pipe material. A truss bar for a three-dimensional structure characterized by that. 2. The truss bar for a three-dimensional structure according to claim 1, wherein a flange is provided at a base end of the sleeve, and a spanner engaging surface is formed on an outer circumference. 3. The truss bar for a three-dimensional structure according to claim 1, wherein the stopper is a snap ring. 4. The truss bar for a three-dimensional structure according to claim 1, wherein the stopper is a C-shaped elastic washer. 5. The truss bar for a three-dimensional structure according to claim 1, wherein the pipe material is made of steel pipe, aluminum or synthetic resin.