JPH1024393A - Joining structure between steel tube ends - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join both steel tubes at the state a cylindrical body is surely interposed between end parts of both steel tubes. SOLUTION: A cylindrical body 4 is interposed over between end parts of both steel tubes 2, 6, the end parts of both steel tubes 2, 6 are joined by welding, a long groove 10 formed to the end part of one of steel tube 2 and a pin 12 protruded from the cylindrical body 4 are arranged. The long groove 10 is formed at the end part of one of steel tube 2 as opened toward the end part. The pin 12 is protruted from the center in the longitudinal direction of cylindrical body 4 directing outward in the radial direction of cylindrical body 4 and in the length enough for holding. By fitting the end part of one of steel tube 2 into the cylindrical body 4 and aligning the end parts of both steel tubes 2, 6, the cylindrical body 4 is pushed into the end part of one of steel tube 2. As the end parts of steel tubes 2, 6 are aligned, the cylindrical body 4 is slided to the side of other steel tube 6 by the pin 12 and is extended over the end parts of both steel tubes 2, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between steel pipe ends which are welded together by joining the ends of the steel pipes.

[0002]

2. Description of the Related Art For example, a steel pipe into which various power cords and signal cords are inserted, a steel pipe attached to a building frame,
In the case of a steel pipe or the like that forms a support, the ends of the steel pipes are joined together by welding to form a steel pipe of a predetermined length. In this case, from the viewpoint of joining the steel pipes coaxially, increasing the strength of the joint, or ensuring airtightness, the inner peripheral surface of the steel pipe is slid over the end between both steel pipes. In many cases, a cylinder having an outer diameter that is movably fitted is interposed. That is, as shown in FIG. 4 (A), the tubular body 4 is fitted to the end of one steel pipe 2 in advance, and the end of the one steel pipe 2 is inserted so that the tubular body 4 is inserted inside. The part and the end of the other steel pipe 6 are matched. The tubular body 4 has rattling inside the steel pipes 2 and 6 from the viewpoint of joining the steel pipes 2 and 6 coaxially, increasing the strength of the joints, or ensuring airtightness. It must be fitted to the steel pipe with some fitting tolerance.

[0003]

Therefore, FIG. 4 (B)
As shown by, when the end of the other steel pipe 6 is fitted to the end of the one steel pipe 2 to which the cylindrical body 4 has been fitted in advance, the end of the other steel pipe 6 causes the cylindrical body 4 to be connected to the one steel pipe 2. 2 was pushed into the end of the steel pipe 2, and it was difficult to interpose the tubular body 4 between the ends of the steel pipes 2 and 6. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a joining between steel pipe ends which can join both steel pipes in a state where a tubular body is interposed between the ends of both steel pipes. It is to provide a structure.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of fitting an end of a steel pipe, and slidably fitting an inner peripheral surface of the steel pipe between both ends of the steel pipe. A joining structure between steel pipe ends in which a tubular body having a diameter is interposed and both ends of the steel pipes are joined by welding, and at one end of one steel pipe, the steel pipe extends in the longitudinal direction of the steel pipe. It is characterized by comprising a long groove formed at an end portion in an open shape, and a pin protruding from a longitudinally intermediate portion of the cylindrical body so as to be movable along the long groove in the long groove.

Further, the present invention is characterized in that two of the long grooves and the pins are provided at intervals in a circumferential direction of the steel pipe and the cylindrical body. Further, in the present invention, the long groove and the pin are provided two at intervals in a circumferential direction of the steel pipe and the cylindrical body, and the cylindrical body is divided into two divided bodies by a slit extending in an axial direction of the cylindrical body. It is divided into two, and each divided body is spot-welded in the slit so as to be able to oscillate with each other around the spot-welded portion, and the pins are provided in each divided body. I do.

In the present invention, the tubular body is fitted to the end of one steel pipe, and at this time, the pin is located at the open end of the long groove. Next, the end of one steel pipe is matched with the end of the other steel pipe.
In this case, the cylindrical body is pushed toward one steel pipe by the end of the other steel pipe, and is pushed into the end of one steel pipe. When the ends of both steel pipes are aligned, the cylinder is slid with the pins toward the other steel pipe, and the cylinder is extended over the ends of both steel pipes. Are joined by welding.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1A is a front view of one steel pipe, FIG. 1B is a side view thereof, FIG. 2A is a front view of a tubular body,
(B) is a view as viewed in the direction of the arrow B in (A), (C) is a view as viewed in the direction of the arrow C in (A), and FIGS. 3 (A) to 3 (C) are explanatory views of the connected state of the ends of the steel pipe. As shown in FIG. 3, the joining structure of the present invention
A tubular body 4 is interposed between the ends of both steel pipes 2 and 6, and the ends of both steel pipes 2 and 6 are joined by welding.
It has a long groove 10 formed at one end of one steel pipe 2, and a pin 12 protruding from the cylindrical body 4. Note that the outer diameter of the cylindrical body 4 is formed to a size that can be fitted to the ends of the steel pipes 2 and 6 without rattling.

As shown in FIG. 1, the long groove 10 extends in the longitudinal direction of the steel pipe 2 at one end of the steel pipe 2 and is formed open toward the end. This long groove 10
Two steel pipes 2 are formed at an interval of 180 degrees in the circumferential direction.

As shown in FIG. 2, the pins 12 project from the center in the longitudinal direction of the cylindrical body 4 outward in the radial direction of the cylindrical body 4 and have a length that can be gripped. I have.
The two pins 12 are provided at intervals of 180 degrees in the circumferential direction of the cylindrical body 4, and each pin 12 is formed to have a diameter that can move within the long groove 10. The cylinder 4 is shown in FIG.
As shown in FIG. 2C, with the pin 12 positioned at the open end of the long groove 10, the end 4A of the cylindrical body 4 located on the long groove 10 side.
Are located inside the steel pipe 2 rather than the deep portion of the long groove 10, and the long groove 1
0 is formed so as to be closed by the cylindrical body 10. Further, in this embodiment, the cylinder 4 is divided into two equal parts by a slit 20 extending in the axial direction of the cylinder 4, and each of the divided bodies 22 As shown in FIG. 2C, the pins 12 are provided on each of the divided bodies 22 so as to be able to swing about each other at the spot welding points 24.

Next, the operation will be described. First, FIG.
As shown in (A), the cylindrical body 4 is fitted to the end of one steel pipe 2. In this case, the rotation angle of the cylinder 4 with respect to the steel pipe 2 is adjusted so that the pin 12 is located at the open end of the long groove 10. When the cylindrical body 4 is fitted to the end of the one steel pipe 2, each divided body 22 can swing around the spot welding point 24, so that the fitting is performed smoothly.

Next, as shown in FIG. 3B, the end of one steel pipe 2 and the end of the other steel pipe 6 are aligned. in this case,
As the ends of the two steel pipes 2 and 6 approach, the cylinder 4 is pushed into the one steel pipe 2 by the end of the other steel pipe 6, with the pin 12 being inserted into the long groove 10 toward the one steel pipe 2. Moving.

When the ends of both steel pipes 2 and 6 are aligned, as shown in FIG.
To the other steel pipe 6 side, and the cylindrical body 4
6 to extend over the end. Then, the ends of both steel pipes 2 and 6 are joined by welding.

Therefore, according to the present embodiment, the two steel pipes 2 and 6 can be joined in a state where the tubular body 4 is securely interposed between the ends of the two steel pipes 2 and 6 and the steel pipes 2 and 6 are coaxial. This is advantageous in that it is joined at the top, that the strength of the joint is increased, that airtightness is ensured, and the like.

If the pin 12 is detachably mounted on the cylinder 4 by, for example, screw connection, the pin 1 is removed from the steel pipe.
2 can be easily removed when it is desired to remove it.

[0015]

As is clear from the above description, the present invention
The ends of the steel pipes are joined, and a cylindrical body having an outer diameter that is slidably fitted to the inner peripheral surface of the steel pipe is interposed between the ends of both steel pipes, and the ends of both steel pipes are joined by welding. A joining structure between steel pipe ends, wherein at one end of one steel pipe, a long groove extending in the longitudinal direction of the steel pipe and formed in an open shape at the end of the steel pipe, and along the long groove in the long groove. A pin protruding from an intermediate portion in the longitudinal direction of the cylindrical body so as to be movable. Therefore, the pin can be moved between the ends of the steel pipe by means of the pins after the end of the steel pipe is aligned with the inside of the pipe interposed therebetween. It is possible to join both steel pipes with the steel pipe interposed therebetween.

[Brief description of the drawings]

1 (A) is a front view of one steel pipe, and FIG. 1 (B) is a side view thereof.

2 (A) is a front view of a cylindrical body, FIG. 2 (B) is a view from arrow B in FIG. 2 (A), and FIG. 2 (C) is a view from arrow C in FIG.

FIGS. 3 (A) to 3 (C) are explanatory views of a connection state of an end portion of a steel pipe.

4 (A) and 4 (B) are explanatory views of a connected state of ends of a conventional steel pipe.

[Explanation of symbols]

 2, 6 steel pipe 4 cylinder 10 long groove 12 pin

Claims (3)

[Claims] 1. A steel pipe having an outer diameter that is slidably fitted to an inner peripheral surface of a steel pipe across the ends of the steel pipes, the ends of both steel pipes being interposed. A long groove formed at the end of one of the steel pipes and extending in the longitudinal direction of the steel pipe and formed in an open end at the end of the steel pipe; And a pin protruding from an intermediate portion in the longitudinal direction of the cylindrical body so as to be able to move along the long groove in the above. 2. The joint structure between steel pipe ends according to claim 1, wherein the long groove and the pin are provided at intervals in the circumferential direction of the steel pipe and the cylindrical body. 3. The long groove and the pin are provided at two intervals in a circumferential direction of the steel pipe and the cylindrical body, and the cylindrical body is divided into two divided bodies by a slit extending in the axial direction of the cylindrical body. Equally divided, and each divided body is configured to be spot-welded in the slit so as to be able to oscillate with each other about this spot-welded portion,
The said pin is provided in each division body, respectively.
The joining structure between steel pipe ends according to the above description.