JPH057805U - Truss joint structure - Google Patents

Abstract

(57) [Summary] [Purpose] In the joint structure of the truss, the spring mechanism is made small and simple, and the bolting sleeve is prevented from falling off from the bolt. [Structure] In a joint structure of a truss that joins the shaft member 1 and the inter-shaft joint body 2 having the screw holes 3 for joining the shaft members, the following structure is adopted. An end member 4 having a bolt insertion hole 5 is provided at the end of the shaft member 1. The spline 9a is inserted through the bolt insertion hole 5 of the end member 4 to the middle of the shaft portion.
A bolt 6 with a head 6a having This bolt 6
Then, a bolting sleeve 9 whose both ends are in contact with the end member 4 and the inter-shaft joint body 2 and whose inner surface is engaged with the spline 6b in a rotationally transmittable manner is covered. A part of the bolt tightening sleeve 9 is connected to the tip of the bolt tightening sleeve 9.
Is provided with a spring member 8 for urging.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure of a truss for joining shaft members made of steel pipe or the like to each other in a space truss or the like.

[0002]

[Prior Art]

 Conventionally, in a structure such as a parking lot, a factory, a meeting place, a three-dimensional trass which is a framework of a roof is composed of a pipe shaft member and a spherical inter-shaft joint body that mutually connects the shaft members. There is. FIG. 6 shows a specific example of the structure of the joint portion. The inter-axis joint body 51 is formed in a spherical shape and is provided with a plurality of screw holes 53 for joining the shaft members 52 in each direction. 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 is provided with a spline 56a in the middle of the shaft portion, and is covered with a bolting sleeve 57 having an internal shape that meshes with the spline 56a. A spring member 58 supported by a spring stopper 59 is incorporated in the rear portion of the anchor sleeve 55.

The joining work is performed as follows. First, with the bolt 56 pressed against the spring member 58, the bolt tightening 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 engaged with the entrance of the screw hole 53 by the above rotation, and is tightened by continuing the rotation of the bolt tightening sleeve 57. In this way, the shaft member 52 and the shaft indirect joint 51 are joined.

[0004]

[Problems to be solved by the device]

 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, a spring stopper 59 is required at the rear portion of this sleeve, There is a problem that the spring mechanism becomes large and complicated. In addition, since the bolt tightening sleeve 57 can be freely inserted into and removed from the bolt 56, the bolt tightening sleeve 57 may fall off from the bolt 56 during the joining work, which causes a problem that work safety and efficiency are impaired. is there.

The present invention is to provide a truss joint structure in which the spring mechanism can be downsized and simplified, and the bolting sleeve can be prevented from coming off from the bolt.

[0006]

[Means for Solving the Problems]

 This invention has the following configuration in a joint structure of a truss for joining an inter-shaft joint body 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 bolt with a head having a non-circular cross section is inserted in the middle of the shaft and is inserted into the bolt insertion hole of this 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 is engaged with the non-circular cross-section so as to be rotatable. The bolting sleeve is provided with a spring member, a part of which is connected to the tip of the bolting sleeve to bias the bolt.

[0007]

[Action]

 The tip of the bolt protruding from the bolt tightening sleeve is applied to the screw hole portion of the inter-shaft joint by the biasing force of the spring member, and the tip of the bolt is pressed against the screw hole of the inter-shaft joint by the biasing force of the spring member. In this state, when the bolt tightening sleeve is rotated in a predetermined direction, the bolt is projected from the bolt tightening sleeve while rotating together with the bolt tightening sleeve, and is screwed into the screw hole of the inter-shaft joint body.

[0008]

【Example】

 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 at the corner portion of each tetrahedron by the inter-axis joint body 2. As shown in FIG. 5, the inter-shaft joined 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 between a shaft member 1 and an inter-shaft joint body 2. The shaft member 1 is made of 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. The anchor sleeve 4b has a bolt insertion hole 5 through which a bolt 6 is inserted. ..

The bolt 6 has a head portion 6a having an enlarged diameter, and a non-circular cross-section portion 6b formed of a spline or the like is formed from the head portion 6a to the middle of the shaft portion. The outer periphery of the bolt 6 is covered with a bolting sleeve 9 having a non-circular cross-section inside 9a matching 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 portion 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 bolt tightening sleeve 9. In this case, the spring member 8 is composed of a truncated cone-shaped 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 lock the bolt 6 on the side projecting from the bolt tightening sleeve 9. Energize.

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 welded to the shaft member 1 in advance. 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 screwed into the thread groove of the bolt 6. That is, while the inner sleeve 9 is covered on the outer circumference of the tip of the bolt 6, the inner sleeve 7 is rotated in a predetermined direction to lock the tip of the spring member 8 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 preparation for joining. Under this condition, the tip side of the bolt 6 fully projects from the bolting 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 propulsive force for the screw hole 3 of the inter-shaft joint body 2 by the urging force of the spring member 8.

Under this state, 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. When tightened up, the joining is completed.

According to the joint structure of the truss, the spring member 8 is thus arranged in the bolting sleeve 9, so that the spring member 8 is arranged on the end member 4 side as in the case of the conventional example. There is no need to form a housing, 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, it may be an integral part. Further, although the inner sleeve 7 is used for mounting the spring member 8 in the above-described embodiment, the spring member 8 may be directly coupled to the bolt tightening sleeve 9 without providing the inner sleeve 7. Furthermore, the non-circular cross-section 6b of the bolt 6 is not limited to a spline, and may be configured with an angular axis, an elliptical axis, or the like.

[0019]

[Effect of the device]

 In the joint structure of the truss of the present invention, since a part of the spring member for urging and projecting the bolt is connected to the tip of the bolt tightening sleeve, the spring mechanism for urging and projecting the bolt toward the inter-shaft joint can be downsized and simplified. At the same time, 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, 8 ... Screw member, 9 ... Bolt tightening sleeve

Claims (1)

[Claims for utility model registration] 1. An inter-shaft joined body having screw holes for joining shaft members, an end member having a bolt insertion hole provided at an end portion of the shaft member, and the bolt of the end member. A headed bolt that is inserted into the insertion hole and has a non-circular cross section in the middle of the shaft portion, and both ends of the bolt that are covered by the bolt come into contact with the end member and the inter-shaft joint body and the inner surface is the non-circular cross section. A joint structure for a truss including a bolt tightening sleeve that engages in a rotationally transmittable manner, and a spring member that is partially connected to the tip of the bolt tightening sleeve and that biases the bolt to project.