JPH0862089A - Device for inspecting watertightness of pipe joint - Google Patents

Abstract

PURPOSE: To provide a device for inspecting the watertightness of a proper pipe joint at a ductwork for sending drain with pressure which has improved transportation and operability and especially has a small aperture. CONSTITUTION: The title device is in a set before transportation in a ductwork and does not require any mounting operation in the ductwork. The device is carried in the ductwork, a first seal device 10 opposes a first innerperiphery surface 4 of one pipe 1, and a second seal device 20 opposes an inner-periphery surface 7 of the other pipe 5. The device is easily carried by reducing the diameters of seal bodies 15 and 25 by separating wheel bodies 11, 12, 21, and 22 for separating them from inner-periphery surfaces 4 and 7. An actuation device 40 is operated and the wheel bodies are relatively brought closer and then the diameters of the seal bodies 15 and 25 are increased for pressing against the inner-periphery surfaces 4 and 7. A small amount of fluid is supplied to a small space 35 which is formed between the seal devices 10 and 20 and around the joint part to inspect watertightness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for confirming whether or not a small-diameter pipe (ductile cast iron pipe, iron pipe, etc.) used in, for example, a sewage pumping line is joined and then joined correctly. The present invention relates to a water tightness inspection device for pipe joints used in.

[0002]

2. Description of the Related Art For example, in a small-diameter ductile cast iron pipe used for supplying tap water, at the time of completion inspection of the pipe, tap water is actually supplied to the pipe to apply water pressure to the pipe joint portion. Watertightness inspection is performed. However, there is no source of tap water in the pipeline for sewage pumping, it is difficult to secure the amount of sewage that can fill the entire pipeline at the time of completion, or a sewage pump alone is sufficient for watertightness inspection. Since it is difficult to secure sufficient water pressure, there are many difficulties in conducting a watertightness inspection of joints.

Conventionally, as a watertightness inspection device of this type,
Place a metal cylindrical test band on the inner circumference of the pipe joint,
Both ends of the test band in the tube axial direction and the inner peripheral surface of each tube are sealed to form a sealed space for watertightness inspection.

In order to perform sealing, an annular seal material is arranged between the outer peripheral surface of both ends of the test band and the inner peripheral surface of each tube, and a push ring is fastened to both ends of the test band with a plurality of bolts. It is known that the sealing material is compressed by doing so.

Alternatively, a cylindrical seal member extending from the inner peripheral surface of one pipe to the inner peripheral surface of the other pipe in the joint portion is arranged on the outer periphery of the test band and is arranged on the inner peripheral side of the test band. It is also known that the seal member is compressed by expanding the diameter of the test band with a plurality of circumferential bolts that are screwed outward from the support in the radial direction.

[0006]

However, in each of these conventional watertightness inspection devices, since a heavy and bulky metal test band is used, the device is located at the position of the pipe joint to be handled or inspected in the pipe. However, there is a problem in that it is difficult to carry. In addition, a plurality of bolts must be operated in order to compress the sealing material, and the operability is poor. Especially in the case of a small-diameter pipe, it becomes more difficult to carry and operate bolts.

An object of the present invention is to provide a water tightness inspection device for a pipe joint, which is excellent in transportability and operability, and which is particularly suitable for a small-diameter sewage pressure-feeding pipeline.

[0008]

In order to achieve the above object, a water tightness inspection device for a pipe joint according to the present invention comprises a first seal device arranged to face the inner peripheral surface of one jointed pipe. ,
A second sealing device that is arranged to face the inner peripheral surface of the other pipe, and these sealing devices respectively have a pair of ring bodies in the axial direction of the pipe and a ring-shaped ring located between both ring bodies. A seal body, and an actuating device configured to move the ring bodies of both sealing devices toward each other by configuring the seal body to be expanded in diameter and brought into pressure contact with the inner peripheral surface by the relative movement of both ring bodies. A fluid supply device is provided for supplying a fluid to the space between both sealing devices.

[0009]

According to the above-described structure of the present invention, since the watertightness inspection device is set in the pipeline before transportation,
It is possible to eliminate the need for an attaching operation in the pipeline. Then, the watertightness inspection device is carried in the pipe, and the first sealing device is opposed to the inner peripheral surface of one of the pipes, and the second sealing device is opposed to the inner peripheral surface of the other pipe. At this time, in both seal devices, the diameter of the seal body is reduced by the reverse operation of the actuating device to move the two ring bodies away from each other, thereby separating the seal body from the inner peripheral surface of the pipe, and It can be transported without any problems.

Next, when the actuating device is actuated to move the pair of ring members in both sealing devices relatively close to each other, the sealing members move outward while being expanded in diameter and come into pressure contact with the inner peripheral surface of the pipe. Become. As a result, it is possible to form a small sealed space between the sealing devices and around the joint. Then, a desired water-tightness test can be performed by supplying a fluid to the void through the fluid supply device, applying a test fluid pressure, and checking whether or not there is a leak from the outside of the joint. At that time, since the void portion can be formed to be small, it is filled with a small amount of fluid, so that the fluid amount can be easily secured. If it is confirmed by inspection that there is no abnormality in the joint portion, the watertightness inspection device can be removed by performing the procedure reverse to the above.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. Reference numerals 1 and 5 denote a pair of pipes jointly joined to each other, and a receiving port 2 is formed at an end of one pipe 1, and an inserting port 6 inserted into the receiving port 2 is provided at an end of the other pipe 5. Are formed. A sealing material storage groove 3 is formed on the inner circumference of the receiving opening 2, and the annular rubber sealing material 9 stored in the sealing material storage groove 3 is pressed against the outer peripheral surface of the insertion opening 6.

A first sealing device 10 arranged to face the inner peripheral surface 4 of the one pipe 1 and a second sealing device 20 arranged to face the inner peripheral surface 7 of the other pipe 5 are provided. To be Each of these sealing devices 10 and 20 has a pair of ring bodies in the axial direction of the tube.
11 and 12, 21 and 22, and ring-shaped seal bodies (for example, rubber rings) 15 and 25 positioned between both wheel bodies 11, 12, 21, and 22, and both wheel bodies 11, 12, 21, 22 Are configured to be expanded relative to each other and to be pressed against the inner peripheral surfaces 4, 7 by expanding the diameter of the seal bodies 15, 25.

That is, a vertically oriented substrate 30 which can be inserted into a conduit.
Therefore, the support shaft 8 which is also used for both the sealing devices 10 and 20 is continuously provided in the axial direction of the pipe. Wheels 1 of both sealing devices 10 and 20
1, 12, 21, and 22 are ring plate-shaped, and are fitted onto the support shaft 31 so as to be slidable in the axial direction. Each wheel 11, 12,
21 and 22 are formed as tapered surfaces 13, 14, 23 and 24 whose opposite surfaces on opposite sides are inclined so as to be separated from each other with increasing distance from the axis, and on both sides of both seal bodies 15 and 25. The surfaces are formed as tapered surfaces 16, 17, 26, and 27 that can closely contact these tapered surfaces 13, 14, 23, and 24 in a dense manner.

Therefore, for example, the first sealing device 10
In the above, the relative movement of the pair of wheels 11 and 12 causes the tapered surfaces 13 and 14 to move closer to each other, so that the diameter of the seal body 15 is increased through the tapered surfaces 16 and 17. While being moved, the outer peripheral surface 18 is brought into pressure contact with the inner peripheral surface 4. The second sealing device 20 also operates in the same manner.

Ring bodies 11, 12, 21, 22 of both seal devices 10, 20
An actuating device 40 is provided for moving the. That is, the actuating device 40 is composed of a hydraulic jack 41 arranged between the one sealing device 10 and the base plate 30, a transmission body 42 arranged between the sealing devices 10 and 20, and the like.

A plurality (or a single number) of the hydraulic jacks 41 are provided between the base plate 30 and the wheel body 11 located on the base plate 30 side. May be adopted. Further, the transmission body 42 has a tubular shape, and the ring bodies 12 and 21 of the sealing devices 10 and 20 adjacent to each other are adjacent.
In between, it is configured to be fitted onto the support shaft 31 and slidable in the axial direction. Then, rubber packings 43 and 44 are fixed to both end surfaces of the transmission body 42, and these rubber packings 43 and 44 are attached.
Are pressed against the adjacent surfaces (side surfaces) of the adjacent wheels 12 and 21 to enable sealing between the wheels 12 and 21 and the transmission 42. A pin 32 is provided at the free end of the support shaft 31 so as to limit the movement limit of the wheel body 22 in a driving shape.

With the above structure, the seal bodies 15 and 25 are brought into pressure contact with the inner peripheral surfaces 4 and 7, and the rubber packings 43 and 44 are brought into pressure contact with the adjoining surfaces of the ring bodies 12 and 21.
Between 10 and 20, a void 35 reaching the joint is formed. Then, a fluid supply device that supplies fluid (water or air) to the void 35.
36 are provided. The fluid supply device 36 is shown by a pipe penetrating both wheels 11 and 12 of the one sealing device 10, and its proximal end side is connected to a fluid supply source (not shown).

The operation of the above embodiment will be described below. The watertightness inspection is performed at the time of joining joints when laying pipelines. That is, since the watertightness inspection device is set in the pipeline before transportation, it may be unnecessary to perform an attaching operation in the pipeline. Then, the watertightness inspection apparatus is carried (inserted) in the pipe by wheels or a trolley provided on the substrate 30 side, and as shown in FIG. 1, a first seal is applied to the inner peripheral surface 4 of one pipe 1. The device 10 is made to face, and the second sealing device 20 is made to face the inner peripheral surface 7 of the other pipe 5. At this time, in the both seal devices 10 and 20, the seal bodies 15 and 25 are contracted by the contraction movement of the hydraulic jack 41 by the elastic force, so that the two wheel bodies 11 and
By moving 12, 21, 22 away from each other, the outer peripheral surfaces 18, 28
Are separated from the inner peripheral surfaces 4 and 7, so that they can be transported in the pipeline without trouble.

Next, when the hydraulic jack 41 is extended,
The first sealing device 10 is guided by the support shaft 31 and the first sealing device 10 becomes the second sealing device.
After being moved to the 20 side, the ring body 12 of the first sealing device 10 is first brought into contact with the rubber packing 43 of the transmission body 42, and the transmission body 42 is integrally moved. Next, the rubber packing 44 on the opposite side of the transmission body 42 is brought into contact with the ring body 21 of the second sealing device 20.

When the hydraulic jack 41 is further extended in this state, in the both sealing devices 10 and 20, the pair of ring bodies 11, 12, 21, and 22 are relatively moved toward each other, and the taper surfaces thereof are moved.
13, 14, 23, 24 will be moved closer to each other, taper surface
The seal bodies 15, 25 are moved outward while being expanded through the 16, 17, 26, 27 (pushed outward in the circumferential direction), so that as shown in FIG. The outer peripheral surfaces 18 and 28 are pressed against the inner peripheral surfaces 4 and 7 of the tubes 1 and 5 to maintain the surface pressure.

At this time, the adjacent wheel bodies 12 and 21 and the transmission body 42
The rubber packings 43 and 44 are pressed against each other, so that a small sealed space 35 is formed between the sealing devices 10 and 20 and around the joint. The pressure contact force (contact pressure) against the inner peripheral surfaces 4, 7 of the seal bodies 15, 25 can be arbitrarily adjusted by the operation amount of the hydraulic jack 41.

Then, the fluid 48 is supplied to the space 35 through the fluid supply device 36, the inspection fluid pressure is applied, and the presence or absence of leakage from the outside of the joint is confirmed, whereby the desired water tightness inspection can be performed. . At that time, since the void portion 35 can be formed small, it is filled with a small amount of fluid 48, so that the fluid amount can be easily secured. Then, if it is confirmed by inspection that there is no abnormality in the joint portion, the procedure reverse to the above is performed to return to the state of FIG. 1 due to the elastic force of the seal members 15 and 25, and thus the watertightness inspection device is removed. (Withdrawal from inside) is performed.

In the above embodiment, the hydraulic jack 41 is used as the actuating device 40, but other types such as a screw shaft type may be used. Further, in the above embodiment, the fluid supply device 36 is a pipe that penetrates both the ring bodies 11 and 12 of the one sealing device 10, but this is a fluid path extending from the axial center of the support shaft 31 to the transmission body 42. Other forms, such as forming

[0024]

According to the present invention having the above structure, since the watertightness inspection device is set in the pipeline before transportation, it is possible to eliminate the need for an attaching operation in the pipeline and to improve the operability. Can be excellent. By separating the reduced-diameter seal body from the inner peripheral surface of the pipe, the watertightness inspection device can be transported in the pipe line without any trouble. Furthermore, the inspection can be performed by supplying fluid to the small gap formed between both seal devices and around the joint, so that the gap can be filled with a small amount of fluid, so that the amount of fluid is easy. Can be secured. As described above, according to the present invention, it is possible to provide a watertightness inspection device for a pipe joint, which is excellent in transportability and operability, can easily secure the inspection fluid, and is particularly suitable for a small-diameter sewage pressure-feeding pipeline.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention and explaining a mounting state of a water tightness inspection device for a pipe joint.

FIG. 2 is a cross-sectional view illustrating a usage state of the watertightness inspection device for the pipe joint.

[Explanation of symbols] 1 one pipe 4 inner peripheral surface 5 other pipe 7 inner peripheral surface 9 sealing material 10 first seal device 11 ring body 12 ring body 15 seal body 18 outer peripheral surface 20 second seal device 21 ring body 22 Wheel body 25 Seal body 28 Outer peripheral surface 31 Support shaft 35 Gap 36 Fluid supply device 40 Actuator 41 Hydraulic jack 42 Transmission body 43 Rubber packing 44 Rubber packing

Claims (1)

[Claims] 1. A first sealing device arranged to face the inner peripheral surface of one of the jointed pipes, and a second sealing device arranged to face the inner peripheral surface of the other pipe. However, each of these sealing devices has a pair of ring bodies in the tube axis direction and a ring-shaped seal body located between the two ring bodies, and the seal bodies are moved by the relative movement of both ring bodies. It is characterized in that it is configured to be expanded in diameter and brought into pressure contact with the inner peripheral surface, provided with an operating device for moving the rings of both sealing devices toward each other, and provided with a fluid supply device for supplying fluid to the gap between both sealing devices Water tightness inspection device for pipe joints.