JPH0693668A - Connection structure of truss - Google Patents

Abstract

PURPOSE:To miniaturize and simplify a spring mechanism while preventing the slipping-off of a bolt clamping sleeve. CONSTITUTION:In the connection structure of a shaft member 1 and an inter- shaft connector 2, the following constitution is determined. An anchor sleeve 4 is installed at the end section of the shaft member 1, and a bolt 6 screwed to the tapped hole 3 of the inter-shaft connector 2 is inserted. The bolt 6 has a non-circular shaft section 6b such as a spline, and a head section 6a is engaged with the internal end face of the anchor sleeve 4. A bolt clamping sleeve 7 held between the anchor sleeve 4 and the inter-shaft connector 2 is mounted on the outer circumference of the bolt 6. A rotational engaging section 7a engaged with the non-circular shaft section 6b of the bolt 6 in a rotational transmissible manner and a large-diametral inner circumferential surface section 7b are formed to an inner circumferential surface through a stepped section 7c in the bolt clamping sleeve 7. A spring bearing nut 8 movably fitted into the bolt clamping sleeve 7 and screwed to a front end screw section 6c and a spring member 9 are set up to the bolt 6. Both ends of the spring member 9 are interlinked with the stepped section 7c of the bolt clamping sleeve 7 and the spring bearing nut 8, and the bolt 6 is projected and energized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a truss for joining shaft members made of steel pipe or the like 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. 7 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.
Is provided, and the outer circumference is covered with a bolting sleeve 57 having an internal shape that meshes with the spline 56a. 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 structure of FIG. 7, 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 joint structure of a truss which can make a spring mechanism small and simple and can prevent a bolting sleeve from falling out of a bolt.

[0006]

SUMMARY OF THE INVENTION The present invention comprises a shaft member,
In the truss joint structure for joining the shaft member and the inter-shaft joint body having the screw hole for joining, the following structure is adopted. An anchor sleeve is provided at the end of the shaft member, and a bolt into which the tip screw portion is screwed is inserted into the screw hole of the inter-shaft joint body. This bolt has a non-circular shaft portion such as a spline, and its head engages with the inner end surface of the anchor sleeve. On the outer circumference of this bolt, a bolting sleeve is provided which is sandwiched between the anchor sleeve and the inter-shaft joint body.
The bolting sleeve has an inner peripheral surface formed with a rotary engaging portion that engages with the non-circular shaft portion in a rotationally transmittable manner, and a large-diameter inner peripheral surface portion located on the bolt tip side of the rotary engaging portion via a step portion. It is a thing. The bolt is provided with a spring receiving nut and a spring member that are loosely fitted in the bolt tightening sleeve and screwed into the tip screw portion. Both ends of the spring member engage the stepped portion of the bolt tightening sleeve and the spring receiving nut to urge the bolt to project.

[0007]

[Operation] In the state before the connection to the inter-shaft joined body, the bolt uses the step portion of the bolt tightening sleeve as a reaction force point.
The spring member is pushed out of the bolting sleeve by pushing the spring bearing nut. This protruding bolt
Push in against the spring member and align the tip of the bolt with the screw hole of the inter-shaft joint. As a result, the tip of the bolt is pressed against the screw hole of the inter-shaft joint by the biasing force of the spring member. When the bolt tightening sleeve is rotated in a predetermined direction in this state, the bolt gradually protrudes from the bolt tightening sleeve while rotating together with the bolt tightening sleeve, and is screwed into the screw hole of the intershaft joint. When the bolting sleeve tries to fall out in the unconnected state, the spring member pushes the bolting sleeve back through the nut, so that the bolting sleeve is prevented from coming off. Since the spring member is housed in the bolt tightening sleeve, the spring member is small in size, and the anchor sleeve does not need a spring stopper, which simplifies the structure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. 5A to 5C 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. 6, 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 an anchor sleeve 4 is joined to the end portion by welding 5. Anchor sleeve 4
Inserts a bolt 6 screwed into the screw hole 3 of the inter-shaft joint body 2, and the bolt head 6 a engages with the inner end surface of the anchor sleeve 4. The bolt 5 has a non-circular shaft portion 6b made of a spline, and its tip is formed as a screw portion 6c.

On the outer circumference of the bolt 6, a bolt tightening sleeve 7 sandwiched between the anchor sleeve 4 and the inter-shaft joint body 2 is covered. The bolting sleeve 7 has a rotary engaging portion 7a formed on the inner peripheral surface thereof, which is a spline groove that engages with the non-circular shaft portion 6b of the bolt 6, and a large-diameter inner peripheral surface portion 7b located on the bolt tip side. It is formed via the step portion 7c. The outer peripheral surface of the bolt tightening sleeve 7 is formed to have a hexagonal cross section or the like.

Further, there are provided a spring receiving nut 8 which is loosely fitted in the bolt tightening sleeve 7 and screwed to the tip screw portion 6c of the bolt 6, and a spring member 9 which is a compression coil spring. The spring member 9 is a stepped portion 7c of the bolt tightening sleeve 7.
Both ends engage with the spring receiving nut 8. As shown in FIG. 4 (A) or (B), the spring bearing nut 8 has an engaging hole 8a or an engaging groove 8b for a rotary tool on the front surface.

The above-mentioned joining parts 4 to 9 are assembled and set as follows. Explaining the assembly procedure,
With the bolt 6 inserted into the anchor sleeve 4 and the bolt tightening sleeve 7 as shown in FIG. 3, the spring member 9 is inserted into the bolt tightening sleeve 7 from the tip side of the bolt. Next, the nut 8 is screwed in from the tip of the bolt to set a series of parts 4-9.

Next, the joining operation will be described. In the state before the connection, the bolt 6 uses the step portion 7c of the bolt tightening sleeve 7 as a reaction force point and the spring member 9 causes the spring receiving nut 8 to move.
It is made to project from the bolting sleeve 7 by pushing. The projecting bolt 6 is pushed against the spring member 9, and the tip of the bolt 6 is aligned with the screw hole 3 of the inter-shaft joint body 2 as shown in FIG. As a result, the tip of the bolt 6 is pressed against the screw hole 3 by the urging force of the spring member 9, and the initial propulsive force for the screw hole 3 is obtained.

When the bolt tightening sleeve 7 is rotated in a predetermined direction in this state, the bolt 6 gradually protrudes from the bolt tightening sleeve 7 while rotating together with the bolt tightening sleeve 7, and is screwed into the screw hole 3 of the intershaft joint 2. . By screwing in this way, the head portion 6a of the bolt 6 contacts the end surface of the anchor sleeve 4 as shown in FIG. 1, and the bolt tightening sleeve 7 is in a tensioned state between the anchor sleeve 4 and the inter-shaft joint body 2. The joint is completed when tightened up to.

According to the joint structure of this structure, the spring member 7
Since it is housed in the bolt tightening sleeve 7, the size is small, and the anchor sleeve 4 does not need to be spring-loaded, so that the structure is simple. In the unconnected state such as during construction,
When the bolt tightening sleeve 7 tries to fall off, the spring member 9 pushes the bolt tightening sleeve 7 back through the nut 8 to prevent the bolt tightening sleeve 7 from falling off. Moreover, a series of parts 4 to 9 can be set as described above.

Although the non-circular shaft portion 6b of the bolt 6 is made of a spline in the above embodiment, the non-circular shaft portion 6b may be formed of an angular shaft portion, an elliptic shaft portion or the like.

[0017]

According to the joint structure of the truss of the present invention, the spring member for projecting and urging the bolt is housed in the bolt tightening sleeve, and is engaged between the nut screwed to the bolt and the step surface in the bolt tightening sleeve. Since the spring members and the parts used for locking the spring members are made compact and simplified, the cost can be reduced, and the bolting sleeves can be prevented from falling off during the construction. Therefore, the safety and work efficiency of the joining work are improved. In addition, a series of parts such as anchor sleeves and bolts can be assembled into a set, which makes it easy to handle.

[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.

4A and 4B are front views of various examples of nuts.

FIG. 5 is a plan view, a side view, and a front view of a truss to which this joining structure is applied.

FIG. 6 is a partially enlarged front view of the same.

FIG. 7 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 ... Anchor sleeve, 6 ... Bolt, 6a ... Head, 6b ... Non-circular shaft part, 6c ... Tip screw part, 7 ... Bolt fastening sleeve, 7a
... Rotary engagement part, 7b ... Large-diameter inner peripheral surface part, 7c ... Step part, 8
... Spring receiving nut, 9 ... Screw member

Claims (1)

[Claims] 1. A joint structure for joining a shaft member of a truss to an inter-shaft joint body, wherein an anchor sleeve provided at an end portion of the shaft member and having an inner peripheral surface serving as a bolt insertion hole, and inserted into the anchor sleeve. A bolt having a non-circular shaft portion, a head portion of which engages with an inner end surface of the anchor sleeve, and a tip screw portion of which is screwed into a screw hole of the inter-shaft joint, and the anchor which is provided on the outer circumference of the bolt. A rotary engagement portion that is sandwiched between the sleeve and the inter-shaft joint and that engages with the non-circular shaft portion so that rotation can be transmitted to the non-circular shaft portion, and a large-diameter inner peripheral surface portion located closer to the bolt tip side than this is a step. Of the bolt tightening sleeve, a spring receiving nut that is screwed to the threaded end of the bolt and loosely fits in the bolt tightening sleeve, and is arranged on the outer circumference of the bolt. Previous A joint structure of a truss including a stepped portion and a spring member that engages both ends with the spring receiving nut and biases the bolt so as to project.