JP2001263554A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint preventing the pipe itself from being damaged by absorbing the insertion force, when an abnormal insertion force acts in the axial direction of the pipe in the pipe joint used for the buried pipe. SOLUTION: This pipe joint formed of a pipe body 1 provided with a diameter-enlarged receiver 11 and a pipe body 2 provided with an insertion port 21 to be inserted in the diameter-enlarged receiver 11 is characterized in that a core 3 having a stopper part 331 for the receiver and a breaking function 32 for a case where the abnormal force acting in the axial direction of the pipe body is incorporated in the inside face of the diameter-enlarged receiver 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for buried pipes for electric power and communication cables or sewage buried pipes, and more particularly to a pipe joint when an abnormal insertion force acts in the axial direction of the pipe. The present invention relates to a pipe joint characterized in that a pipe body itself is prevented from breaking by absorbing insertion force.

[0002]

2. Description of the Related Art In recent years, seismic countermeasures for pipelines have been regarded as important, and the expanded diameter of rubber rings for buried pipes and the like has become longer. Has become mainstream. At this time, in order to stop the spout at a predetermined fixed position, for example, as shown in a partial cross-sectional view of the pipe joint in FIG. In this case, two marking lines 5 are drawn on the outer surface of, and the construction is performed such that the tip end of the enlarged diameter receiving port 11 is located between the two marking lines.

[0003]

SUMMARY OF THE INVENTION In the conventional construction technology,
In the case of power line and communication line protection pipes, when connecting multiple pipes or multiple pipes, insert the spigot into the enlarged diameter receiving port more than necessary or insert it shallowly and set it at a predetermined position. Was difficult. Therefore, there has been often seen a problem that the required expansion and contraction length of the pipe is not secured.

[0004]

SUMMARY OF THE INVENTION The present invention seeks to provide a pipe joint which solves the above problems.
(1) In a pipe joint including a pipe having an enlarged diameter receiving port and a pipe having a spigot inserted into the enlarged diameter receiving port, an abnormality occurs in a stopper portion of the spigot and in an axial direction of the pipe. A pipe joint characterized in that a core having a destruction function when a large insertion force is applied is built in the inner surface of an enlarged diameter receiving port. (2) The pipe joint according to the above (1), wherein the destruction function is a projection provided on the outer peripheral tip of the core.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of one embodiment of the pipe joint of the present invention in which a spigot is set at a regular position in an enlarged diameter spout. FIG. FIG. 3 is a partial sectional view of a conventional pipe joint.

In FIG. 1, an enlarged diameter receiving port 1 is provided at one end of a tubular body 1.
1, a rubber ring 4 is fitted into a tip portion in the enlarged diameter receiving port 11, and a core 3 is built in a deep portion thereof. The core 3
Has a stopper portion 31 for fitting the spigot 21 of the tubular body 2 to the inner surface at one end and stopping it, and has a projection 32 on the outer periphery at the other end. The core 3 is preferably made of a synthetic resin, and the projections 32 may be provided on the entire circumference of the core 3 or may be provided at several positions on the same peripheral surface, for example, at evenly four positions. The projections 32 are connected to each other to such an extent that the projections 32 have a function of breaking apart from the outer surface of the core 3 when an abnormal insertion force acts in the axial direction of the tube.

Next, the procedure for connecting the pipe joint of the present invention is shown in FIG.
It will be described in detail based on this. The core 3 is inserted into the enlarged-diameter receiving port 11 of the tubular body 1, and then the core 3 is slid to the deep portion of the enlarged-diameter receiving port 11 so that the protrusion 32 of the core 3 and the innermost part of the enlarged-diameter receiving port 11 are separated. Then, the setting of the core 3 is completed. Rubber ring 4
Is inserted into the enlarged diameter receiving port 11, and then the spigot 21 of the tubular body 2 is inserted from the end face of the enlarged diameter receiving port 11, and is slid to the back to make the tip thereof contact the stopper portion 31 of the core 3. The outlet 21 is set at a regular position in the enlarged diameter receiving port 11. When the spigot 21 and the enlarged-diameter receiving port 11 are set at the proper positions, the marking line 5 attached to the outer periphery of the spigot 21 of the tube 2 is located at the end face of the enlarged-diameter receiving port 11. At the same time, the front end of the spigot 21 is configured to be located at a position substantially bisecting the enlarged diameter receiving port 11.

When an abnormal insertion force acts in the axial direction of the pipe due to an earthquake or the like in a state where the spigot 21 is set at a regular position in the enlarged diameter receiving port 11 as shown in FIG. 3
2 is separated from the core 3, and the core 3 moves to the inner part in the enlarged diameter receiving port 11 as shown in FIG. 2 to absorb the expansion and contraction of the tubes 1 and 2 in the axial direction.

[0009]

According to the pipe joint of the present invention, if the tip of the spigot 21 is inserted into the stopper portion 31 of the core 3 built in the enlarged diameter spout 11, the spigot 21 can be easily expanded. It can be set at a regular position in the receptacle 11. Also, the insertion condition can be confirmed from outside by the mark line 5. When an abnormal insertion force acts in the axial direction of the pipe due to an earthquake or the like, the projection 32 separates from the core 3 and is broken, and the core 3 moves to a deep portion inside the enlarged diameter receiving port 11. Since the expansion and contraction of the tubes 1 and 2 can be absorbed, the tubes 1 and 2 are not damaged at all at the time of an abnormality. Therefore, at the time of repair, it is only necessary to replace the core 3 without replacing the pipe itself, so that it is possible to greatly reduce repair cost and work time.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of one embodiment of the pipe joint of the present invention in which a spigot is set at a regular position in a diameter-increased receiving port.

FIG. 2 is a partial cross-sectional view of one embodiment of the pipe joint of the present invention, showing a positional relationship of a spigot in an enlarged-diameter receiving port at the time of abnormality.

FIG. 3 is a partial sectional view of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 11 Large diameter receiving port 2 Pipe 21 Spout 3 Core 31 Stopper part of spout 32 Projection 4 Rubber ring 5 Marked line

Claims (2)

[Claims] 1. A pipe joint comprising a tube having an enlarged-diameter receiving port and a tube having a spigot inserted into the enlarged-diameter receiving port. A pipe joint characterized in that a core having a destruction function when an abnormal insertion force is applied is built in the inner surface of an enlarged diameter receiving port. 2. The pipe joint according to claim 1, wherein the destruction function is a projection provided at an outer peripheral end of the core.