JP2748100B2 - Space truss fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a space truss.

[0002]

2. Description of the Related Art Conventionally, as a joint of this type of space truss, a screw hole formed in a central portion of an end cap provided at an end portion of a steel pipe along a central axis of the steel pipe and at least formed in a joint node is provided. A bolt consisting of a male screw part having a matching length and a shaft part having a polygonal structure on the outer surface on which the socket is fitted is inserted and is longer than the outer diameter of the socket in a right-angled through hole provided in the bolt. A joint of a space truss having a temporary pin removably inserted and supported, and moving the temporary pin along a slit provided in the socket so that an initial screwing of the bolt and the screw hole of the joint node is performed, or a bolt head There has been proposed a joint of a space truss in which a portion is pressed by an elastic body such as a spring and the tip of a bolt is urged in a screw hole direction of a joint node. Also, as a detent of the conventional joint, a set screw etc. is provided in the end cap part,
After the screwing operation of the bolt is completed, the set screw is screwed in and the tip of the screw is pressed against the bolt, thereby stopping the rotation of the bolt and stopping the bolt. (For example, Japanese Utility Model 59-
194410, Japanese Utility Model Publication No. 1-20401, Japanese Utility Model Application Publication No. 4-15841, Japanese Patent Laid-Open No. 57-107411.
In each of the above-described prior arts, the initial screwing and positioning can be performed by pushing the bolt in the direction of the joint node, but the final tightening of the bolt is confirmed. There is a problem that uneasiness is always left because it cannot be performed. In addition, in the means for pressing the bolt head with an elastic body such as a spring, a spring receiving member such as a flange must be attached to the end cap. And the cost is high.

As another conventional joint of a space truss, a bolt is provided at the center of an end cap provided at an end of a steel pipe, the bolt being aligned with the central axis of the steel pipe and screwed into a screw hole formed at a joint node. At the same time, a lock nut having a double-nut structure is screwed into place at the predetermined position of the bolt, and the outside of the lock nut is engaged with the polygonal outer surface of the lock nut to transmit rotation and connect the bolt to the joining node. And a socket having an outer surface to be screwed into the screw hole having a polygonal structure. (See, for example, Japanese Patent Application Laid-Open No. 62-55346.) In the joint of the space truss using the lock nut having the double nut structure described above, since the rotational force of one lock nut is used, the connection for tightening the bolt is not sufficient. It is possible,
Can't loosen. This has the disadvantage that the technology cannot be disclosed by demonstration of the joining and disassembly work on the joining node at the exhibition hall and the like, and further, there is a problem that anxiety always remains because the bolt tightening cannot be reconfirmed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint of a space truss which can reconfirm final tightening of a bolt with a simple structure, does not cause anxiety, and can quickly perform a detent operation simply by driving a pin. It is in.

[0005]

An object of the present invention is to provide a steel pipe end.
At the center of the end cap provided at the center axis of the steel pipe.
And screwed into the screw hole formed at least in the joint node
The external surface on which the male screw part and the socket
Bolt consisting of polygonal rotation transmission means is inserted
In the head of the bolt
Of the bolt separated from the surface by the thickness of the end cap
A through hole (6) for confirming the final tightening of the bolt is provided on the shaft.
At the end cap side of the socket.
Through-hole (6) A through-hole for visual observation is provided.
Fits around half the circumference of the through hole (6) on the outer surface of the cap
Form a semi-circular groove and join to the joining node
In the posture, the through hole (6) of the bold, the concave groove of the end cap and
And through holes of sockets and common detents
The end caps and the bolts.
The bolt and detent are integrated by integrating the bolt and socket
This can be achieved by doing so.

[0006]

Next, details of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway side view of an embodiment of a joint main body showing a state before joining to a joining node, FIG. 2 is a perspective view of FIG. 1, and FIG. 4 is a perspective view of FIG. 3, FIG. 5 is a cross-sectional view taken along line AA of FIG. 3, FIG. 6 is a cross-sectional view taken along line BB of FIG. 3, and FIG. It is sectional drawing of the -C line.

An embodiment will be described in detail with reference to FIGS. The structure of the joint body A attached to both ends of the steel pipe 1 will be described. The joint body A is configured as follows. That is, the end pipe 2 is fitted and welded to both ends of the steel pipe 1, and is screwed into a hole 2 a provided in the center of the end cap 2 along the central axis of the steel pipe 1 and into a screw hole 3 a formed in the joint node 3. A bolt 4 is movably inserted, and a semicircular groove 2b having a cross shape in a front shape passing through the center of the hole 2a is formed in the outer surface diametrical direction of the end cap 2. The bolt 4 has a head portion 4a that contacts the inner surface of the end cap 2, a circular shaft portion 4b, and a circular shaft portion 4b.
Polygonal shaft portion 4c such as an octagon having substantially the same diameter as the polygonal shaft portion 4c
Male screw portions 4d smaller in diameter than c are sequentially formed. The axial direction of the bolt 4 is applied to the tip of the polygonal shaft portion 4c of the bolt 4 and the polygonal shaft portion 4c of the bolt 4 separated from the inner surface of the head 4a of the bolt 4 by the thickness of the end cap 2. And a through hole 6 for confirming final tightening
Is formed so that a part of the one through hole 6 fits into the concave groove 2 b of the end cap 2 in a state where the bolt 4 is finally tightened to the joining node 3. 7 is
A socket that is partially engaged with the front end of the polygonal shaft portion 4c of the bolt 4 in a non-joined state with the joining node 3, and the other through hole is formed in the end of the socket 7 on the end cap 2 side. 5, a slit 8 longer than the diameter of the through hole 5 is formed, and a temporary pin 9 longer than the diameter of the socket 7 is detachably attached to the through hole 5 through the slit 8. Let the insertion be supported. In Figure _1, 1 ₁ = 1 _2, 1 3 _{<1 4}
It is what it was. The joint main body A is constructed as described above. At the time of final tightening, the joint main body A has a concave groove 2b of the end cap 2, a through hole 6 of a bolt 4 adapted to the concave groove 2b.
It is a combination of a detent pin 10 commonly driven into a slit 8 corresponding to the through hole 6. Such an end cap 2 constituting the configured joint body A was welded at both ends of a steel pipe 1, to assembly production in chords or factory diagonal members B are bonded to the junction node 3.

[0008]

[Description of Assembling Operation] The string or diagonal member B, the pin 10 and the joining node 3 produced in the factory as described above are carried into a construction site, and assembled and joined as follows. As shown in FIG. 1, the joining node 3 is set on a gantry (not shown), and the chord B is temporarily placed. The socket 7 is brought into contact with the seating surface of the joining node 3,
The provisional pin 9 inserted and supported in the through hole 5 of the bolt 4 through the slit 8 of the socket 7 is rotated while manually moving along the slit 8 to rotate, and the tip of the male screw portion 4d of the bolt 4 and the joint node 3 After the initial engagement with the screw hole 3a is performed, the temporary pin 9 is removed and the socket 7 is rotated with a jig such as a spanner to screw the male screw portion 4d of the bolt 4 into the screw hole 3a of the joining node 3. When the head 4a of the bolt 4 comes into contact with the inner surface of the end cap 2, the rotation resistance with the bolt 4 increases, and the screw 4 approaches a predetermined screwing amount. The other through hole 6 is visually observed from the slit 8 of the socket 7, and the socket 7 is further rotated while reconfirming the final screwing amount, and the concave groove 2 b of the end cap 2, the through hole 6 of the bolt 4, and the slit of the socket 7 are formed. Match 8 Next, the concave grooves 2b,
Pin 10 for preventing return common to through hole 6 and slit 8
And end cap 2, bolt 4, socket 7
Are integrated, and the detent of the bolt 4 and the final tightening of the bolt are confirmed.

[0009]

According to the configuration of the present invention as described above,
The following effects can be obtained. (A) Through holes provided in bolts from through holes in socket (6)
By visually observing, the final tightening of the bolt can be easily confirmed, and anxiety about insufficient bolt tightening can be eliminated. (B) End cap groove, bolt through hole (6) ,
By aligning the through holes of the sockets and driving pins in common with them, the end cap, the bolt, and the socket are integrated, and the return of the bolt can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a joint main body showing a state before being joined to a joining node.

FIG. 2 is a perspective view of FIG.

FIG. 3 is a partially cutaway side view of the joint main body showing a state after being joined to a joining node.

FIG. 4 is a perspective view of FIG.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view taken along line BB of FIG. 3;

FIG. 7 is a sectional view taken along line CC of FIG. 3;

[Explanation of symbols]

 A Joint body B String material or diagonal material 1 Steel pipe 2 End cap 2a Hole 2b Concave groove 3 Joining node 3a Screw hole 4 Bolt 4a Head 4b Circular shaft part 4c Polygon shaft part 4d Male screw part 5 Through hole 6 Through hole 7 Socket 8 Slit 9 Temporary pin 10 Pin

Claims (1)

(57) [Claims] 1. A male screw part and a socket are provided at a central part of an end cap provided at an end part of a steel pipe, the male screw part having a length along a central axis of the steel pipe and at least screwing into a screw hole formed in a joining node. In a joint of a three-dimensional truss in which a bolt composed of a rotation transmitting means having a polygonal outer surface to be fitted is inserted, a shaft portion of the bolt separated from an inner side surface of the head of the bolt by a thickness corresponding to the thickness of the end cap. And a through hole (6) for confirming final tightening of the bolt, and a through hole (6) for visually checking the through hole (6) on the end cap side of the socket , while the through hole is provided on an outer surface of the end cap. Hole
Form a semicircular cedar bark groove that fits approximately half the circumference of (6)
The through hole of the bolt in the joint position with respect to the joint node
(6) Make sure that the groove in the end cap and the hole in the socket are
And hit a detent pin in common to them.
The end cap. bolt. Socket in one
That the bolt can be detented.
The joint of the space truss to be the symbol.