JPH11350591A - Space truss joint part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a space truss joint part structure in which the tightened state of a connection bolt can be confirmed. SOLUTION: A pipe end 2 comprises the attaching part of the side of a steel pipe 3, the boss part 2d of the side separated from the steel pipe 3, and the through hole 2e of a center part. An end cap 5 is made a conical shape whose outside diameter is reduced toward the side of a ball joint 1, and comprises the boss receiving recess part 5b of the side of a pipe end 2 and a through hole 5c for inserting a connection bolt 4. A stop screw with a hexagonal hole 7 for inserting the connection bolt 4 in a through hole for insertion 6a and screwing the connection bolt 4 in the ball joint 1 is provided on a spacer 6, and a key groove for screwing the connection bolt 4 with the ball joint and a deeper stop screw fall part than the key groove for confirming that the connection bolt 4 is sufficiently screwed on the end of the key groove are provided on the connection bolt 4 by falling the stop screw 7 of the spacer 6 and rotating the spacer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joint structure of a truss joint used for a structural building in the construction field,
In particular, the present invention relates to a three-dimensional truss joint structure for connecting a ball joint and a truss.

[0002]

2. Description of the Related Art Conventionally, as a frame technology of a large space building such as a gymnasium or an exhibition hall, there is a technology of forming a three-dimensional truss by connecting steel pipes three-dimensionally. In such a space truss, each component is made into a standard part, and a system truss capable of forming a space truss simply by assembling those parts is generally adopted at a construction site.

A conventional joint structure of such a space truss is disclosed in Japanese Patent Application Laid-Open No. Hei 6-108529. FIG. 4A is a cross-sectional view showing a joint structure of the space truss. The joint structure of the space truss includes a ball joint (ball joint) 21 having a screw hole 26 and a ball joint 21.
A rod member 22 having a nose cone 27 at an end, and a key groove 23a provided on a side portion, and a screw hole of the ball joint 21 is formed through a through hole 28 formed in the nose cone 27. 26, a rotating ring 24 attached between the ball joint 21 and the nose cone 27 by penetrating the connecting bolt 23, and the rotating ring 24 and the ball joint 21. A spacer 25 that is fitted and attached to the connection bolt between the rotation ring 24 and the rotation ring 24.
And a screw pin 29 which is screwed into the key groove 23a of the connecting bolt 23 and a male screw portion 23b of the connecting bolt 23 is drawn toward the ball joint 21 by the rotating ring 24. The ball joint 21 can be screwed into the screw hole 26 of the ball joint 21 by turning.

In the joint structure of the space truss, a method of connecting the ball joint 21 and the rod member 22 with the connecting bolts 23 will be described in detail. A sectional view taken along the line AA of FIG. As shown in FIG.
A screw pin 29 is provided to enter the groove 23a. When the rotating ring 24 is turned, the connecting bolt 2 is inserted through the screw pin 29.
3 rotates, and the connection bolt 23 is screwed into the screw hole of the ball joint 21. And bolt head 23c of connection bolt 23
By screwing the connecting bolt 23 until the ball contacts the nose cone 27, the ball joint 21 and the rod member 22 are completely connected.

[0005]

However, the joint structure of the conventional space truss described above has the following problems.

[0006] The size of the rotating ring located between the ball joint and the rod is smaller than the size of the ball joint and the rod, and a step is formed, which is not preferable from the viewpoint of aesthetics.

Further, it cannot be confirmed whether or not the connecting bolt is completely screwed. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems of the prior art, and has a preferable structure in terms of aesthetic appearance, and a three-dimensional truss joint structure capable of confirming a screwed state of a connecting bolt. It is intended to provide.

[0008]

The space truss joint structure according to the present invention comprises a ball joint having a screw hole, a steel pipe having a pipe end at an end, and a key groove at a side. A connection bolt screwed into a threaded hole of the ball joint through a through hole formed in the pipe end; and an end mounted by penetrating the connection bolt between the ball joint and the pipe end. A three-dimensional truss joint structure comprising a cap and a spacer fitted between the end cap and the ball joint so as to be fitted to the connection bolt, wherein the pipe end is provided on a steel pipe side. A mounting portion having an outer diameter substantially the same as the outer diameter of the provided steel pipe, a boss having an outer diameter smaller than the outer diameter of the steel pipe provided on a side remote from the steel pipe, and having an external thread provided on the outer periphery, and a center portion Through the connection bolt provided in Consists of a through hole for the end cap is substantially the same maximum outer diameter of the outer diameter of the steel pipe,
Boss receiving recess having a conical shape whose outer diameter is reduced toward the ball joint side and having an internal thread on the inner periphery for engaging with a boss portion of the pipe end provided on the pipe end side And a through hole through which the connection bolt is inserted. The spacer has a through hole through which the connection bolt is inserted at the center and a hexagonal hole through which the connection bolt is screwed into the ball joint. The connecting bolt is provided with a key groove for screwing the connecting bolt to the ball joint by dropping the set screw of the spacer and rotating the spacer. The set screw lowering portion is provided deeper than the key groove for confirming that the connection bolt is sufficiently screwed into the terminal end of the key groove.

In this joint structure of a space truss, when the steel pipe and the ball joint are connected by a connecting bolt, a hexagon socket set screw provided on the spacer is screwed into a key groove of the connecting bolt. , Rotate the spacer. When the spacer is rotated, the connecting bolt rotates integrally with the spacer because the set screw is screwed into the key groove. Therefore, when the tip of the connection bolt is applied to the screw hole of the ball joint, the connection bolt is screwed into the screw hole.

At the time when the set screw is screwed in a certain amount, the set screw is screwed in. If the set screw is screwed into a set screw dropping portion provided at the end portion of the connection bolt, the connection bolt is sufficiently screwed. Abort.

When the set screw is screwed in and the set screw is not screwed into the set screw dropping portion provided at the end portion of the connection bolt, the connection bolt is further screwed.

When the connection bolt is sufficiently screwed in this way and there is a gap between the ball joint and the spacer due to a manufacturing error or the like, the end cap screwed to the pipe end is rotated. Let the end cap
To the side, and press the spacer against the ball joint to eliminate the gap.

In the joint structure of the space truss according to the present invention, the connection between the ball joint and the steel pipe is performed in this manner, so that the connection between the ball joint and the steel pipe is performed with high accuracy. Since no step is generated, the aesthetic appearance is favorable.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1A and 1B are sectional views of a three-dimensional truss joint structure. FIG. 1A shows a state in which a ball joint and a steel pipe are not connected, FIG. 1B shows an intermediate stage of connection, and FIG. Indicates the status.

FIG. 2 is an explanatory view of the connecting bolt.
(A) is a plan view of the key groove of the connecting bolt as viewed from directly above,
(B) is BB sectional drawing of (a).

FIGS. 3A and 3B are explanatory views of the end cap, wherein FIG. 3A is a front view and FIG. 3B is a side view.

The three-dimensional truss joint structure has a screw hole 1a.
And a steel pipe 3 having a pipe end 2 at an end, a key groove 4a provided at a side portion, and a through hole 2e formed in the pipe end 2 to form the ball joint. A connection bolt 4 screwed into the threaded hole 1a of the first joint 1 and the connection bolt 4 between the ball joint 1 and the pipe end 2;
And a spacer 6 fitted between the end cap 5 and the ball joint 1 by being fitted to the connection bolt 4.

The structure of the three-dimensional truss joint will be described in detail.
The pipe end 2 has an outer diameter substantially the same as the outer diameter of the steel pipe 3 provided on the steel pipe 3 side, and an insertion portion 2a for connecting to the steel pipe 3 is provided on the steel pipe side, and an end cap is provided on the end cap 5 side. Mounting part 2c provided with a protruding part 2b that covers
And a boss 2d having an outer diameter smaller than the outer diameter of the steel pipe 3 provided on the side remote from the steel pipe 3 and having an external thread provided on the outer periphery, and the connecting bolt 4 provided at the center thereof. And a through hole 2e.

The end cap 5 has a conical shape in which the maximum outer diameter is substantially the same as the outer diameter of the steel pipe 3 and the outer diameter is reduced toward the ball joint 1. Are provided with four tool grooves 5a at equal angular intervals.
The boss 2 of the pipe end 2 is provided on the pipe end 2 side.
Boss receiving recess 5b having an internal thread on the inner periphery to be screwed to d
Is provided, and a through hole 5c through which the connection bolt 4 is inserted is provided at the center.

The spacer 6 is provided with a through hole 6a for inserting the connecting bolt 4 into the center and a hexagon socket set screw 7 for screwing the connecting bolt 4 into the ball joint 1. Have been.

FIG. 2A shows the connecting bolt 4.
And (b), the set screw 7 of the spacer 6 is dropped to rotate the spacer 6,
A key groove 4a for screwing the connecting bolt 4 to the ball joint 1 and a key groove 4a for confirming that the connecting bolt 4 is sufficiently screwed into the end of the key groove 4a. A deeper recess 4b for the set screw 7 is provided.

Next, a method of connecting the ball joint 1 and the steel pipe 3 with the connecting bolts 4 will be described. FIG. 1A shows the ball joint 1 and the steel pipe 3 before connection. First, the male screw of the boss 2d of the pipe end 2 and the female screw of the end cap 5 are screwed together. The end cap 5 is screwed until the end of the cap 5 comes into close contact with the end face of the mounting portion 2c of the pipe end 2.

Next, the connecting bolt 4 is inserted into the through hole 2e of the pipe end 2 and the through hole 5c of the end cap 5, so that the tip of the connecting bolt 4 is exposed outside the end cap 5. After the spacer 6 is inserted into the exposed portion of the connection bolt 4 through the through hole 6a, the hexagon socket set screw 7 provided in the spacer 6 is inserted into the key groove 4a of the connection bolt 4. Screw it in until it contacts the groove bottom, so that the spacer 6 does not easily fall off the connecting bolt 4. In the work up to this stage, the pipe end 2, the end cap 5, and the spacer 6 can be pulled out of the connecting bolt 4 at one end by the set screw 7 with a hexagonal hole and at the other end by the bolt head 4c of the connecting bolt 4. Since they are not present, they are connected together. Then, the mounting portion 2c of the pipe end 2 in such a state is welded to the end of the steel pipe 3.

In this manner, the steel pipe 3 to which the pipe end 2, the connecting bolt 4, the end cap 5, and the spacer 6 are attached is mounted on the ball joint 1 at a predetermined position on the construction site. To the screw hole 1a of the ball joint 1 so that the connection bolt 4 can be easily screwed into the screw hole 1a. Is slightly loosened and the spacer 6 is rotated so that the connecting bolt 4 can be rotated together with the set screw 7 having a hexagonal hole.

Thereafter, when the spacer 6 is rotated using a tool, the connecting bolt 4 rotates and is screwed into the screw hole 1a of the ball joint 1.

Then, the bolt head 4c of the connecting bolt 4 is
The screwing of the connecting bolt 4 is completed when the pipe end 2 comes into contact with the end face on the steel pipe 3 side of the mounting portion 2c.

FIG. 1B shows a state in which the connection bolt 4 has been completely screwed. Ideally, at this time, a gap is generated between the spacer 6 and the ball joint 1. If not, it is preferable from the viewpoint of aesthetics.
A small gap occurs.

Therefore, in order to eliminate this gap, the end cap 5 is rotated so as to come out of the boss portion 2d of the pipe end 2, and the end cap 5 is moved toward the ball joint 1, and the spacer 6 is moved. Closely contact ball joint 1.

FIG. 1 (c) shows a state in which the spacer 6 is brought into close contact with the ball joint 1. By doing so, the ball joint 1 and the steel pipe 3 are apparently removed. It is in a state where it is connected by the conical end cap 5, which is aesthetically preferable.

The male screw of the connecting bolt 4 and the female screw of the screw hole 1a of the ball joint 1 are not well screwed, and the bolt head 4c of the connecting bolt 4 is attached to the mounting portion 2 of the pipe end 2.
Before hitting the end face of the steel pipe 3 on the side of the steel pipe 3, screwing may not be possible. In such a case, the strength of the joint is insufficient, and the joint may be broken when an external force such as an earthquake is applied. Therefore, it is desirable to be able to confirm that the screwing is completely performed. However, whether or not the bolt head 4c has hit the end face of the mounting portion 2c of the pipe end 2 on the steel pipe 3 side as described above cannot be confirmed from outside since the bolt head 4c is inside the steel pipe 3.

Therefore, in the present invention, the connecting bolt 4
At the end of the key groove 4a, a set screw drop-in portion 4b having a depth greater than the depth of the key groove 4a is provided. Then, the set screw 7 with a hexagonal hole provided in the spacer 6 was screwed in, and the screwing was completed when the set screw 7 was large enough to reach the groove bottom of the set screw dropping portion 4b. To judge.

Therefore, there is no possibility that the joint is broken due to insufficient screwing of the connecting bolt.

[0034]

According to the present invention, it is possible to provide a three-dimensional truss joint structure having an aesthetically pleasing structure and capable of confirming the screwed state of the connecting bolt.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a three-dimensional truss joint structure according to an embodiment of the present invention, in which (a) shows a state where a ball joint and a steel pipe are not connected, (b) shows an intermediate stage of connection, and (c). ) Indicates a connection end state.

FIG. 2 is an explanatory view of a connecting bolt used in the three-dimensional truss joint structure according to the embodiment of the present invention, wherein (a) is a plan view of a key groove of the connecting bolt as viewed from directly above, and (b). FIG. 3 is a view taken along the line BB in FIG.

FIG. 3 is an explanatory view of an end cap used in the three-dimensional truss joint structure according to the embodiment of the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 4 is an explanatory view of a conventional three-dimensional truss joint structure.
(A) is a cross-sectional view of the joint structure, (b) is AA of (a).
It is an arrow view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball joint 1a Screw hole 2 Pipe end 2a Insertion part 2b Projection part 2c Attachment part 2d Boss part 2e Through hole 3 Steel pipe 4 Connection bolt 4a Key groove 4b Set screw drop part 4c Bolt head 5 End cap 5a Tool groove 5b Boss receiving recess 5c Through hole 6 Spacer 6a Through hole 7 Set screw with hexagonal hole

Continuing from the front page (72) Inventor Kazuyo Seo 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hiroshi Masuda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Stock In-company (72) Noriaki Okamoto Inventor, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Junichi Murata 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Katsunori Kurabe 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd.

Claims (1)

[Claims] 1. A ball joint having a screw hole, a steel pipe having a pipe end at an end, and a key groove provided on a side,
And the hole is formed through a through hole formed in the pipe end.
A connection bolt screwed into the screw hole of the ball joint, an end cap attached by penetrating the connection bolt between the ball joint and the pipe end, and the end cap and the ball joint. A three-dimensional truss joint structure including a spacer which is fitted to and attached to the connecting bolt, wherein the pipe end has an outer diameter substantially equal to an outer diameter of a steel pipe provided on the steel pipe side. Part, a boss portion having an outer diameter smaller than the outer diameter of the steel pipe provided on the side away from the steel pipe and having an external thread provided on the outer periphery, and a through hole for inserting the connection bolt provided at the center portion. The end cap has a maximum outer diameter substantially equal to the outer diameter of the steel pipe,
A boss receiving recess having an internal thread with a female screw screwed into a boss portion of the pipe end provided on the pipe end side, and having a conical shape in which the outer diameter is reduced toward the joint side; The spacer has a through hole through which the connection bolt is inserted, and the spacer has a through hole through which the connection bolt is inserted at the center and a hexagonal hole stop for screwing the connection bolt into the ball joint. Screws are provided,
The connection bolt is connected to a key groove for screwing the connection bolt to the ball joint by dropping a set screw of the spacer and rotating the spacer, and a terminal end of the key groove. A three-dimensional truss joint structure, wherein the set screw drop-in portion is provided deeper than a key groove for confirming that the bolt has been sufficiently screwed.