JPH081353Y2 - Stopper for expandable joint - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper for expandable pipe joints, and more particularly to a stopper for expansion and contraction control applied to expandable pipe joints that can expandably connect pipes such as water pipes.

[0002]

2. Description of the Related Art In this type of expandable joint, a so-called hydraulic performance test is conducted to confirm the presence or absence of water leakage after assembly. In this case, the test is performed by setting the expandable joint in a contracted state in a test jig and allowing a fluid having a constant pressure to flow through the expandable joint.

Further, in order to prevent the expandable joint 21a from inadvertently expanding and contracting during its transportation, the expandable joint 21a is mounted on a plurality of sleepers 22 as shown in FIG.
While being set, the band 23 is fixed and the conveyance is performed.

[0004]

However, in the above-mentioned conventional hydraulic performance test, when the expansion joint 21a is attached to or detached from the test jig, the expansion joint 21a is inadvertently careless. Since there is a possibility that the expansion and contraction operation is performed, the test work becomes extremely complicated, and thus there is a great problem that the workability is remarkably lacking.

Further, the expandable joint 2 for transportation and the like
The work of attaching 1a to the sleeper 22 and the work of removing it from the sleeper 22 at the time of piping work are complicated, and the removal of the sleeper 22 also allows the expandable pipe joint 21 to be attached during construction.
There was also a great inconvenience that the a was inadvertently expanded and contracted to hinder the construction work.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and from the hydraulic performance test before transfer, etc., without impairing the expansion and contraction function of the expandable joint.
The task is to make the handling extremely simple so as to be convenient for each work from transportation and construction work.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a telescopic operation of a telescopic pipe joint in which a pair of joint bodies 1 and 1a are slidably fitted to each other so as to be telescopic. Is a stopper for regulating
A stopper for an expandable pipe joint, which is provided between flange portions provided on each of the joint bodies 1 and 1a and is provided with a breakage portion 20 which can be broken when an external force of a predetermined amount or more is applied.

[0008]

Therefore, when performing a water pressure test of the expandable joint having the stopper characterized by the above-mentioned structure, since the expansion and contraction operation of the expandable joint is restricted by the stopper, the water pressure test in this state is performed. The jig can be easily attached and detached.

Further, since the expandable joint does not inadvertently expand and contract during transportation, construction, etc., it is convenient for handling.

On the other hand, after the construction, for example, when ground subsidence occurs, earth pressure due to the ground subsidence will be applied to the expandable pipe joint and the stopper, but the stopper is extended by the external force, Accordingly, the expandable joint also expands to some extent, and if the external force is less than a certain level, the expansion and contraction operation of the expandable joint is restricted without breaking the stopper. On the other hand, when an external force above a certain level is applied, the stopper breaks through the breakage part of the stopper, and the breakage releases the expansion and contraction restriction. By performing the operation, the original function of the expandable pipe joint can be exhibited.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a swing pipe joint 5 having a joint pipe 2 and a spherical portion 4 provided on one end of the joint pipe 2 and spherically slidably fitted on the spherical portion 3. A joint body composed of an auxiliary ring body 6 for preventing separation of the two, and flange portions 7 and 8 having a plurality of through holes (not shown) on the outer circumference of the rocking pipe joint 5 and the auxiliary ring body 6. The bolts 9 are respectively formed and are inserted while leaving the through holes 5a, ...

Reference numeral 11 designates a bellows-like cover body made of rubber attached between the joint pipe 2 and the auxiliary ring body 6, which is muddy water, earth and sand,
Prevents foreign substances such as pebbles from entering the sliding surface. Reference numeral 12 is an O-ring for sealing.

Reference numeral 1a denotes the other joint body having the same structure as the joint body 1, and the joint body 1a is slidably fitted into the one joint body 1 and has an annular convex portion 13 protruding from the outer peripheral surface thereof. And the ring-shaped convex portion 14 projecting from the inner peripheral surface of one joint body 1 and the ring body 15 attached to the tip of the joint body 1 are engaged with each other to regulate the slide of both. . 16 is the annular convex portion 14 of one joint body 1.
It is an O-ring for sealing that is attached to the back surface of the. A flange portion 5a is provided at the other end of the one swing joint pipe 5.

Reference numeral 17 denotes a rod-shaped stopper which is inserted into the through holes 5a, 6a, ... Remaining in the flange portions 7, 8 of the joint bodies 1, 1a and installed between the joint bodies 1, 1a.
Nuts 19 ... Are tightened to the threaded portions 18 formed at both ends thereof and fixed to the flange portions 7 and 8, and an annular notch portion 20 is provided at a substantially central portion in the circumferential direction so as to have a predetermined shape. When an external force is applied, the stopper 17 can be broken through the notch 20.

The present embodiment is constructed as described above, and the expandable joint 21 is used by being buried in the ground for use as a joint for water pipes, for example.
A hydraulic performance test is conducted after the assembly of item 1.

In this case, the expandable joint 21 is set in a test jig. Since the expandable joint 21 is restricted in its expansion and contraction operation by the stoppers 17 ... There is no inadvertent expansion and contraction at the time of removal and removal, and thus a series of test operations can be performed extremely simply and quickly.

Further, even during transportation and construction, the expansion / contraction operation is similarly restricted by the stoppers 17 ... To a great extent.

On the other hand, after the construction, for example, when ground subsidence occurs and an external force is applied to the expandable pipe joint 21, the stopper 17 is extended by the external force, and the expandable pipe joint 21 is also slightly expanded. When the external force is a certain value or less, the stopper 17 does not break and the expansion and contraction operation of the expandable joint 21 is restricted. On the other hand, when an external force of a certain amount or more is applied, the stopper 17 breaks through the notch 20 of the stopper 17, and the breakage releases the expansion and contraction restriction. The pipe joint 21 expands and contracts and swings to perform the original function of the expandable pipe joint 21. That is, the expandable and retractable pipe joint 21 is appropriately expanded in accordance with the external force within the range in which the stopper 17 can be expanded. Therefore, by utilizing the property of the stopper 17 to expand, its material and notch 20
There is an advantage that the expansion and contraction of the expandable universal joint 21 can be restricted according to various situations by appropriately changing the notch width.

Further, since the stopper 17 has a very simple structure and can be attached using the existing flange portions of the joint bodies 1 and 1a, there is a practical advantage that the stopper 17 can be manufactured inexpensively and easily. .

In the first embodiment, the notch is formed as the break 20 of the stopper 17, but the concrete structure of the break 20 is not limited to this, and the stopper 17 is not limited to this. The number and strength of the can be arbitrarily changed according to the intended use and usage.

Further, the stopper 17 does not necessarily have to be formed in a rod shape, and its specific shape is not limited. The point is that it may be constructed so that it can be installed on the flange portion of the joint body 1, 1a.

Further, in this embodiment, the expandable joint 21 having the swing function has been described, but the expandable joint 21 does not necessarily have to have the swing function.
The specific configuration does not matter.

Besides, the stopper 17 and the joint bodies 1, 1
The design of the attachment means with a can be freely changed within the scope intended by the present invention.

[0025]

As described above, according to the present invention, stoppers are installed between the flange portions provided on both joint bodies, and the stoppers are constructed so that they can be broken when an external force above a predetermined level is applied. Therefore, for example, when attaching and detaching a test jig in a water pressure performance test, during transportation, during construction, etc., careless expansion and contraction like a conventional expandable pipe joint that does not have expansion and contraction control means is performed. As a result, the inconvenience that occurs is completely eliminated, and as a result of the extremely simple handling, it is possible to obtain a particular effect of being greatly useful for a series of operations.

On the other hand, after the construction, for example, when ground subsidence occurs, earth pressure due to the ground subsidence is applied to the expandable joint and the stopper, but the stopper is extended by the external force, As a result, the expandable tube joint also expands to some extent, and if the external force is less than a certain value, the expansion and contraction operation of the expandable tube joint is restricted without breaking the stopper. On the other hand, when an external force above a certain level is applied, the stopper breaks through the breakage part of the stopper, and this breakage releases the expansion and contraction restriction. By performing the operation, the original function of the expandable pipe joint can be exhibited. That is, the expandable joint will be expanded appropriately in accordance with the external force within the range in which the stopper can be expanded. Therefore, by utilizing the property of the stopper to expand, the material and the shape of the fractured part can be changed appropriately. Thus, the expansion and contraction of the expandable universal joint can be restricted according to various situations.

Further, since the stopper according to the present invention has a very simple structure, it can be easily and inexpensively manufactured, and it can be mounted by effectively utilizing the flange portion of the existing expandable joint. There are also advantages.

[Brief description of drawings]

FIG. 1 is a half cutaway view of an expandable joint, showing an embodiment of a stopper according to the present invention.

FIG. 2 is a semi-cut sectional view of the expandable pipe joint in an extended state.

FIG. 3 is a front view showing a conventional transporting form of a stretchable pipe joint.

[Explanation of symbols]

 1, 1a ... Joint body 20 ... Breaking part

Claims (3)

[Scope of utility model registration request] 1. A stopper for restricting the expansion / contraction motion of an expandable pipe joint in which a pair of joint bodies 1, 1a are slidably fitted to each other so that the joint bodies 1, 1a can extend and contract. A stopper for an expandable pipe joint, characterized in that it is provided between respective flange portions and is provided with a breakable portion 20 which can be broken when an external force of a predetermined amount or more is applied. 2. The broken portion 20 is a cutout portion.
The stopper for the expandable pipe joint described. 3. The stopper for an expandable joint according to claim 1, wherein the stopper is formed in a rod shape, and threaded portions 18 are formed at both ends thereof.