JPH08403Y2 - Truss joint structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a truss for joining shaft members such as steel pipes to each other in a space truss or the like.

[0002]

2. Description of the Related Art Conventionally, in a building such as a parking lot, a factory, a meeting place, etc., a three-dimensional truss, which is a frame of a roof, is provided with a pipe shaft member and a spherical inter-shaft joint body for mutually connecting the shaft members. There is one composed of. FIG. 6 shows a specific example of the structure of the joint. The inter-axis joint body 51 is formed in a spherical shape,
A plurality of screw holes 53 for joining the shaft members 52 in each direction are provided. The shaft member 52 is made of a steel pipe, and an anchor sleeve 55 into which a bolt 56 is inserted is screwed to a pipe end 54 welded to the end portion. The bolt 56 has a spline 56a in the middle of the shaft.
And a bolt-tightening sleeve 57 having an internal shape that meshes with the spline 56a is covered on the outer circumference. Anchor sleeve 55
In the rear part, a spring member 58 supported by a spring stopper 59 is incorporated.

The joining work is performed as follows. First, with the bolt 56 pressed against the spring member 58, the bolting sleeve 57 and the screw hole 53 of the inter-shaft joint 51 are aligned. When the bolt tightening sleeve 57 is rotated in this state,
The bolt 56 rotates due to the engagement at the spline 56a. Since the bolt 56 is given a propulsive force by the spring member 58, the bolt 56 is bitten in the inlet portion of the screw hole 53 by the above rotation,
It is tightened by continuing the rotation of the bolt tightening sleeve 57. In this way, the shaft member 52 and the inter-shaft joined body 51 are joined.

[0004]

However, according to the configuration of FIG. 6, since the spring member 58 for biasing the bolt 56 to project is incorporated in the rear portion of the anchor sleeve 55 through which the bolt 56 is inserted, the rear portion of this sleeve is incorporated. Spring stop 59 is needed,
There is a problem that the spring mechanism becomes large and complicated. Also, since the bolt tightening sleeve 57 can be freely inserted into and removed from the bolt 56, the bolt tightening sleeve 57 can be attached during joining work.
May fall out from the bolt 56, which impairs work safety and efficiency.

An object of the present invention is to provide a truss joint structure in which the spring mechanism can be made small and simple, and the bolting sleeve can be prevented from falling out of the bolt.

[0006]

This invention has the following structure in a truss joint structure for joining an inter-shaft joint having a screw hole for joining a shaft member and a shaft member. An end member having a bolt insertion hole is provided at the end of the shaft member. A headed bolt having a non-circular cross section is provided in the middle of the shaft portion by being inserted into the bolt insertion hole of the end member. The bolt is covered with a bolting sleeve whose both ends are in contact with the end member and the inter-shaft joint body, and whose inner surface engages with the non-circular cross-section in a rotationally transmittable manner. The bolting sleeve is provided with a spring member, a part of which is connected to the tip of the bolting sleeve to urge the bolt to project. The spring member is a truncated cone
-Shaped coil spring mounted and fixed in the bolting sleeve
Connected to the bolting sleeve via the inner sleeve
It In this case, the spring member is
To the thread groove of the bolt by fixing it to the
It

[0007]

With the biasing force of the spring member, the tip of the bolt protruding from the bolt tightening sleeve is brought into contact with the screw hole portion of the inter-shaft joint, and the biasing force of the spring member pushes the bolt tip into the screw hole of the inter-shaft joint. To do. In this state, when the bolt tightening sleeve is rotated in a predetermined direction, the bolt is
While rotating with the bolt tightening sleeve, it projects from the bolt tightening sleeve and is screwed into the screw hole of the inter-shaft joint.
In the assembly process before the joining work, the large diameter end is
The small diameter end of the spring member to which
So screw it onto the bolt and then screw the inner sleeve
Secure to the tightening sleeve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. 4A to 4C are a plan view, a side view, and a front view of a space truss to which the joint structure of the truss is applied, respectively. Each shaft member 1 is arranged so as to be located on the ridgeline of the tetrahedron, and is joined to each other by the inter-axis joint 2 at the corners of each tetrahedron. As shown in FIG. 5, the inter-shaft joint body 2 is formed in a spherical shape and is provided with a plurality of screw holes 3 for joining the shaft members 1 in each direction.

FIG. 1 shows a joint structure of a shaft member 1 and an inter-shaft joint body 2. The shaft member 1 is made of a steel pipe, and the end member 4 is welded to the end portion. The end member 4 includes a pipe end 4a welded to the end of the shaft member 1 and an anchor sleeve 4b screwed to the pipe end 4a.
b has a bolt insertion hole 5 through which the bolt 6 is inserted.

The bolt 6 has an enlarged head portion 6a and a non-circular cross-section portion 6b formed of a spline or the like from the head portion 6a to the middle of the shaft portion. The outer circumference of the bolt 6 is covered with a bolting sleeve 9 having a non-circular cross-section inside 9a conforming to the shape of the non-circular cross-section 6b in the rear half. The outer surface of the bolt tightening sleeve 9 is formed in a hexagonal shape or the like.

A part of the spring member 8 is connected to the tip of the bolt tightening sleeve 9 via the inner sleeve 7.
That is, one end of the spring member 8 arranged in the inner sleeve 7 is connected to the tip of the inner sleeve 7 by welding or the like, and the inner sleeve 7 is mounted and fixed to the front half of the bolting sleeve 9. In this case, the spring member 8 is formed of a truncated cone coil spring, and the small diameter end of the spring member 8 is engaged with the thread groove of the bolt 6 so as to be locked, and the bolt 6 is biased to the side projecting from the bolt tightening sleeve 9. To do.

FIG. 3 is a view showing the shaft member 1, the end member 4, the bolt 6, the inner sleeve 7 and the bolt tightening sleeve 9 in an exploded state. The joining procedure of the above configuration will be described.
First, the bolt 6 is inserted into the end member 4 from the inside. The end member 4 is previously welded to the shaft member 1. After that, the bolt tightening sleeve 9 is inserted from the tip of the bolt 6, and the inside 9a of the non-circular cross section is fitted to the non-circular cross section 6b of the bolt 6.

Next, with the tip end side of the bolt 6 protruding from the bolt tightening sleeve 9, the small diameter end of the spring member 8 in the inner sleeve 7 is locked in the thread groove of the bolt 6 in a screwed state. That is, the inner sleeve 9 is attached to the outer periphery of the tip of the bolt 6.
The inner sleeve 7 is rotated in a predetermined direction under the condition that the end portion of the spring member 8 is locked in the thread groove of the bolt 6.

Further, the inner sleeve 7 is fitted into the front half of the bolt tightening sleeve 9 and fixed by welding or the like.
This completes the bonding preparation. Under this state, the tip end side of the bolt 6 sufficiently projects from the bolt tightening sleeve 9.

At the time of joining, as shown in FIG. 2, the bolt 6 is retracted into the bolt tightening sleeve 9 against the spring member 8, and the tip of the bolt 6 is aligned with the screw hole 3 of the inter-shaft joint body 2. As a result, the bolt 6 obtains an initial propulsion force for the screw hole 3 of the inter-shaft joint body 2 by the urging force of the spring member 8.

Under this condition, the bolt tightening sleeve 9
Is rotated in a predetermined direction. As a result, the bolt 6 rotates together with the bolt tightening sleeve 9 and is screwed into the screw hole 3 of the inter-shaft joint body 2. By screwing in this way, the head portion 6a of the bolt 6 contacts the end surface of the end member 4 as shown in FIG. 1, and the bolt tightening sleeve 9 is in a tensioned state between the end member 4 and the inter-shaft joint body 2. The joint is completed when tightened up to.

According to this joint structure of the truss, since the spring member 8 is thus arranged in the bolting sleeve 9, the spring member 8 is provided on the end member 4 side as in the case of the conventional example.
It is not necessary to form a housing portion for arranging, the spring mechanism is simplified, and the components such as the anchor sleeve 4b are downsized. Further, since the bolt 6 and the bolt tightening sleeve 9 are connected via the spring member 8, the bolt tightening sleeve 9 does not fall off from the bolt 6.

Although the end member 4 is composed of the pipe end 4a and the anchor sleeve 4b in the above embodiment,
Also not good as integral part of. Et al is a non-circular cross-sectional portion 6b of the bolt 6 is not limited to the spline, it may be constituted by square shaft or elliptical axis like.

[0019]

In the joint structure of the truss of the present invention, a part of the spring member for projecting and biasing the bolt is connected to the tip of the bolt tightening sleeve, so that the spring mechanism for projecting and biasing the bolt toward the inter-shaft joint is small. In addition to being simplified, it is possible to prevent the bolt tightening sleeve from coming off from the bolt, and it is possible to improve the safety and work efficiency of the joining work. .

[Brief description of drawings]

FIG. 1 is a cutaway side view showing a joined state of an embodiment of the present invention.

FIG. 2 is a cutaway side view showing a state before joining.

FIG. 3 is a side view of the disassembled state.

FIG. 4 is a plan view, a side view and a front view of a truss to which the joining structure is applied.

FIG. 5 is a partially enlarged front view of the same.

FIG. 6 is a sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shaft member, 2 ... Inter-axis joint body, 3 ... Screw hole, 4 ... End member, 5 ... Bolt insertion hole, 6 ... Bolt, 6a ... Head part, 6
b ... Non-circular cross section, 7 ... Inner sleeve , 8 ... Spring member, 9
… Bolting sleeve

Claims (1)

[Scope of utility model registration request] 1. An inter-shaft joined body having a screw hole for joining a shaft member, an end member provided at an end portion of the shaft member and having a bolt insertion hole, and a shaft portion inserted into the bolt insertion hole of the end member. A headed bolt having a circular cross section in the middle, and a bolt which is covered by the bolt and has both ends abutting the end member and the inter-shaft joint body and an inner surface engageable with the non-circular cross section for rotation transmission. Tightening sleeve and this bolt tightening
Fits inside the sleeve by extending from the tip to the middle part
And the large diameter end at the tip of this inner sleeve
Bonding structure of truss including fixed and fixed member having a cone-shaped coil spring whose small diameter end engages with the thread groove of the bolt and urges the bolt to project. .