JPH07333101A - Seal function testing apparatus for pipe joint - Google Patents

Abstract

PURPOSE:To provide a seal function testing apparatus for a pipe joint, which is excellent in operationability and high mobility in a pipe and sufficiently usable even if there exists a step in some degree of size in the pipe joint. CONSTITUTION:A cylindrical supporting frame 42 is set covering from the inner circumference of one pipe 10 to the inner circumference of another pipe 12 to be joined mutually. A pair of expansive seal parts 48 made of a circular and hollow elastic material are supported respectively at one end side and the other side of the supporting frame 42. The expansive seal parts 48 are expanded outward in the radial direction when pressure water 76 is supplied to the insides and closedly attached to the inner circumferential faces. Pressure water 78 is supplied through a leading inlet hole 56 to the sealed space 74 formed between respective expansive seal parts 48 when the seal parts 48 are expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing the sealing performance of pipe joints.

[0002]

2. Description of the Related Art After jointing a pair of pipes, it is common to test the sealing performance of the pipe joints immediately after joining at the piping work site. In the conventional seal performance test device for this purpose, a metallic cylindrical support frame is arranged on the inner periphery of the pipe joint, and the outer peripheral side of this support frame is arranged from the inner peripheral side of one pipe to the other pipe side. A rubber-made cylindrical seal plate is arranged over the inner peripheral side of the. Then, by pressing the one end side and the other end side of the seal plate against the inner peripheral surface of each pipe by a plurality of circumferential bolts that are screwed outward from the support frame in the radial direction, the seal plate is tested for sealing performance. It is designed to form a closed space.

[0003]

However, in such a conventional device, a plurality of bolts must be operated in order to press the seal plate against the inner peripheral surface of the pipe, and the operability thereof is poor. There is. Also, since the seal plate is formed in a tubular shape, if there is a certain amount of misalignment between the one pipe and the other pipe forming the joint and there is a step, this seal plate There is also a problem that it is difficult to deform it following it. Furthermore, the seal plate is pressed by a bolt and deforms outward in the radial direction to adhere to the inner peripheral surface of the pipe, and the amount of expansion and contraction in the radial direction is not so large. There is almost no difference in size. For this reason, there is a problem that it is particularly difficult to pass through the curved pipe portion when moving the inside of the pipe toward another test place after the seal performance test at a certain place is completed.

Therefore, the present invention solves such problems and provides a test apparatus which has good operability, can sufficiently cope with a certain level difference in the joint, and has good mobility in the pipe. The purpose is to get.

[0005]

To achieve the above object, the present invention provides a tubular support frame arranged from the inner peripheral side of one pipe to be jointed to the inner peripheral side of the other pipe, and an annular shape. It is composed of a hollow elastic body and is supported on one end side and the other end side of the support frame,
When a pressurized fluid is supplied to the inside, a pair of expansion sealing materials that expand outward in the radial direction and come into close contact with the inner peripheral surfaces of the one and the other tubes respectively, and when both expansion sealing materials expand And means for applying a test fluid pressure to the closed space formed between these expansion sealing materials.

[0006]

According to such a construction, by simply supplying the pressurized fluid to the inside of the expansion sealing material composed of the hollow elastic body, the sealing material can be expanded without requiring the bolt operation. It can be adhered to the inner peripheral surface of the tube. In addition, since the sealing material is made of a hollow elastic body that can supply pressurized fluid inside, it is more flexible than the conventional one that deforms the rubber sealing plate and makes it adhere to the inner peripheral surface of the pipe. Therefore, even if there is a certain level difference between the one pipe and the other pipe in the joint,
It is possible to easily follow this. Furthermore, since the sealing material is composed of a hollow elastic body, it can be greatly expanded and contracted, and therefore the outer diameter of the test device at the time of contraction can be made sufficiently smaller than the inner diameter of the pipe. Therefore, the mobility in the pipe can be improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the pipe joint shown in FIG.
Is formed, and an insertion opening 16 to be inserted into the receiving opening 14 is formed at the end of the other tube 12. On the inner surface of both tubes 10, 12,
Cement mortar lining layers 18, 18 are formed. A sealing material accommodating groove 20 and an annular groove 22 are continuously formed on the inner periphery of the receiving port 14, and further a rear end surface 24 in the pipe radial direction is formed.

An annular rubber seal member 26 is housed between the outer peripheral surface of the insertion slot 16 and the seal member housing groove 20. Further, in the annular groove 22, a split ring 28 in contact with the end face of the seal material 26, a push ring 30 in contact with the end face of the split ring 28, and a plurality of bolts 32 in the circumferential direction that are screwed out from the push ring 30 in the pipe axis direction. A connecting rod 34 arranged between the head of each bolt 32 and the rear end face 24 is provided. By screwing out the bolt 32 from the push ring 30, the sealing material 26 is compressed and the required sealing performance is imparted to the pipe joint.

Inside the pipe joint, a seal performance test device 40 according to the present invention is arranged. Here, 42 is a tubular support frame, and is arranged from the inner peripheral side of one tube 10 to the inner peripheral side of the other tube 12. An annular groove 44 having a constant width is formed on each of outer peripheries of the support frame 42 on one end side and the other end side in the pipe axis direction. The support frame 42 on the end side further than these annular grooves 44
An annular groove 46 having a width narrower than that of the annular groove 44 is formed on the outer periphery of the portion.

In each of the annular grooves 44, an expansion seal member 48 made of an annular hollow thin elastic body is installed. In detail, these expansion sealing materials 48 are formed in a U-shaped cross section, both side portions 50 thereof are fixed by being adhered to both side surfaces of the annular groove 44, etc., and the central protruding portion 52 thereof has an annular shape. It is configured so as to project radially outward from the groove 44. Alternatively, the expansion sealing material 48 has a cross-sectional shape of O
It can also be an annular tubular body that is continuous in shape or other configurations. A pressurizing fluid supply hole 54 communicating with the inside of the expansion sealing material 48 is formed through the bottom of each annular groove 44, and the supply hole 54 is guided to a pressurizing fluid supply source (not shown). . In the portion of the support frame 42 between the annular grooves 44, a test fluid pressure introduction hole 56 is formed so as to penetrate therethrough,
The introduction hole 56 is led to a test fluid pressure supply source (not shown).

A guide member 60 is provided by utilizing each annular groove 46. The guide member 60 has a brim-shaped guide plate 62 that fits in the annular groove 46.
2 is divided into a plurality of pieces in the circumferential direction and has a plurality of fan-shaped plate pieces 64 as shown in FIG.

Utilizing the end face of the support frame 42, each plate piece
A plurality of brackets 66 corresponding to 64 are attached in the circumferential direction. The bracket 66 supports an operation lever 68 and a toggle clamp 70 that is actuated in the pipe radial direction by the operation lever 68. The toggle clamp 70 is a plate piece.
Connected to 64. Therefore, by manually operating the operation lever 68, the plate piece 64 can be moved in the pipe radial direction via the toggle clamp 70, and the tip edge of the plate piece 64 is pressed against the inner surfaces of the pipes 10 and 12. It can be fixed in the closed position.

As described above, when the plate pieces 64 accommodated in the annular groove 46 are moved outward in the pipe radial direction toward the inner surfaces of the tubes 10 and 12, the distance between the adjacent plate pieces 64 is reduced. Trying to spread. However, as shown in FIG. 3, at the end portions of the adjacent plate pieces 64, overlapping portions 72 are formed so as to overlap each other by reducing the thickness to half, and a gap is formed between these plate pieces 64. It is prevented from occurring.
In such a configuration, when performing a test of the sealing performance of the pipe joint immediately after the completion of joining at the piping site, the support frame 42 in which the expansion seal material 48 and the guide member 62 are mounted is carried into the pipe, and the expansion seal The material 48 is conveyed to the position of the pipe fitting in the contracted state.

At the position of the pipe joint, as shown in the drawing, the support frame 42 is arranged from the inner peripheral side of one pipe 10 to the inner peripheral side of the other pipe 12, and the operating lever 68 is manually operated to operate each plate piece. The leading edge of 64 is pressed against the inside surface of tubes 10, 12. In this state, a pressure of water 76 is applied to the inside of each expansion seal member 48 from the pressurized fluid supply hole 54 to expand the seal member 48 outward in the radial direction, and the central protrusion 52 is formed in each pipe 10. , 12
Close to the inner surface of the. At this time, the guide plate 62 guides the side portion of the expansion sealing material 48, so that the expansion sealing material 48
Is prevented from protruding from the end surface of the support frame 42 in the pipe axis direction.

As described above, pressurized water is applied to the inside of the expansion sealing material 48.
By only supplying 76, the sealing material 48 can be easily brought into close contact with the inner peripheral surfaces of the pipes 10 and 12 without requiring bolt operation or the like. At this time, since the sealing material 48 is made of a hollow thin material, it can be greatly expanded in the pipe radial direction, and even if there is a step more than a certain amount due to the misalignment between the pipes 10 and 12. It is possible to easily absorb the step and reliably seal the inner peripheral surface of the pipe.

As a result, a closed space 74 is formed in the pipe joint, so that pressurized water is introduced into the space 74 through the introduction hole 56.
78 is injected and a prescribed test water pressure is applied, and the presence or absence of water leakage in the pipe joint is tested based on the decrease in water pressure.

After the test is completed, the test water pressure by the pressurized water 78 and the water pressure by the pressurized water 76 are released. As a result, the expansion sealing material 48 contracts, so that the plate piece 64 is moved inward in the radial direction by operating the operation lever 68 and is accommodated in the inner side of the annular groove 46. As a result, the outer diameter of the test device 40 can be made sufficiently small, and the outer peripheral portion of the test device 40 can be sufficiently separated from the inner surfaces of the tubes 10 and 12.
Therefore, the test apparatus 40 can be easily carried in the pipe to the next test place, and in particular, the test device 40 can be easily moved inside the curved pipe.

[0018]

As described above, according to the present invention, when a pressurized fluid is supplied to the inside, it expands outward in the radial direction and comes into close contact with the inner peripheral surfaces of the one and the other tubes, respectively. By supporting the expansive sealing material on both ends of the tubular support frame to form a closed space for testing the sealing performance, this sealing material can be used on the inner circumference of the pipe without the need for bolt operation. It can be easily adhered to the surface, and since the sealing material is composed of a hollow elastic body that can supply pressurized fluid inside, it can exhibit good flexibility, and therefore the joint part Even if there is a certain level difference between the one tube and the other tube, it is possible to easily follow this, and since the sealing material is made of a hollow elastic body, it greatly expands and contracts. Can, did The outer diameter of the shrinkage during the test apparatus can be made sufficiently smaller than the inner diameter of the tube I, it is possible to improve the mobility in this for the tube.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a usage state of a sealing performance test device for a pipe joint according to an embodiment of the present invention.

FIG. 2 is a side view of the guide member in FIG.

FIG. 3 is an end view showing an overlapping portion of the plate pieces in FIG.

[Explanation of symbols]

 10 tube 12 tube 42 Support frame 48 Expansion seal material 54 Pressurized fluid supply hole 56 Introduction hole 74 Sealed space

Claims (1)

[Claims] 1. A tubular support frame disposed from the inner peripheral side of one pipe to be joint-joined to the inner peripheral side of the other pipe, and an annular hollow elastic body,
A pair that is supported on one end side and the other end side of the support frame, and that expands radially outward when pressurized fluid is supplied to the inside and closely contacts the inner peripheral surfaces of the one and the other tubes, respectively. Of the sealing performance of the pipe joint, characterized in that it has a means for applying a test fluid pressure to the closed space formed between these expansion sealing materials when both expansion sealing materials expand. Test equipment.