JP2002365189A - Pressure test jig for pipe and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig for performing a pressure test by closing the end part of a pipe without executing special processing thereto, and its using method. SOLUTION: This jig 1 is equipped with an axis body 2 to be inserted into the end part of the pipe 20, a compressive body 3 having a circular section provided on the axis body 2, and a pressing means 6 for pressing the compressive body 3 in the axial direction. When the compressive body 3 is pressed in the axial direction by the pressing means 6, its outer diameter is enlarged, and the compressive body 3 adheres onto the inside wall of the pipe 20. A fluid is supplied in this state from a fluid supply pipe 9 into the pipe 20 through a supply route 4 in the axis body 2, to perform the pressure test.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig used for easily performing a pressure test of piping and a method of using the same.

[0002]

2. Description of the Related Art Numerous pipes are installed in various facilities such as factories and plants. These pipes are subjected to a pressure resistance or air tightness test and a water filling test (hereinafter, these are simply referred to as pressure resistance tests in the present invention) after construction. Further, even after the operation, when the piping is repaired, a similar pressure resistance test is performed.

[0003] Conventionally, a pressure test of a pipe generally used is a test in which an opening at a pipe end or the like is closed with a black plate or the like, a screw joint or the like is attached to a side wall of the pipe, and the pipe is connected to the screw joint. The test is performed by supplying a test fluid such as a gas or a liquid pressurized from a pipe.

[0004]

However, in the conventional pressure test, threaded joint processing or the like for connecting a fluid supply pipe for the pressure test is performed on the pipe, and no closing means such as a valve is provided at the opening of the pipe. In this case, a closing process is performed on the portion with a black plate. However, there is a problem that a lot of trouble and time are required for the thread joint processing and the closing process using the metal plate, and the efficiency is not good.

If a closing means such as a valve is to be installed at the opening of the pipe, a fluid supply pipe for a pressure test must be connected after the valve is mounted. Was complicated, and there were many time restrictions. Furthermore, the used threaded joint requires a closing process with a blind cover or the like after a pressure test, and has a problem that it is an obstacle to work or the like because it is protruded.
In view of the above, the present invention has been made to solve the above problems in the conventional pressure test, and a new jig for the pressure test and a method of using the same (a pipe closing method and a pressure test method using the jig) have been proposed. The purpose is to provide.

[0006]

According to the present invention, there is provided a jig for a pressure test according to the present invention, comprising: a shaft body which can be inserted from an end of a pipe into a pipe; The compressor includes a compression body and pressing means for pressing the compression body in the axial direction. When the compression body is pressed by the pressing means in a state of being inserted into the pipe together with the shaft, the outer diameter of the compression body is increased so as to be in close contact with the inner wall of the pipe. (Claim 1)

The pressing means in the jig has a main body detachably fixed to the pipe, and a pressing body slidably provided on the main body, so that the pressing body can press the compression body in the axial direction. can do. (Claim 2)

Further, in the above jig, a supply path for supplying a fluid for a pressure test to the shaft body is formed, and the fluid can be supplied into the pipe from the outside in a state where the compression body is brought into close contact with the inner wall of the pipe. It can be configured as follows. (Claim 3)

In order to achieve the above object, the present invention provides a method for using a jig for a pressure test of a pipe, which comprises using one of the jigs described above and connecting a shaft thereof and a compression body fixed thereto to a pipe. And pressurizing the compressed body with a pressing means to block off the pipe end.
(Claim 4)

Further, in order to achieve the above object, a method of using a jig for a pressure test of a pipe according to the present invention uses a jig provided with a shaft having the supply passage, and fixes the shaft and the jig. The compressed body is inserted from the end of the pipe into the inside, the compressing body is pressed by a pressing means to block the end of the pipe, and then the fluid for the pressure test is introduced into the pipe from outside using the supply path. And pressurized to a predetermined pressure.
(Claim 5)

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram for explaining a method for testing the pressure resistance of piping using a jig for a pressure resistance test according to the present invention, and FIG.
FIG. In these figures, 1 is a jig, 2
Is a shaft body, 3 is a compression body, 4 is a supply path, 5 is a main body, 6 is a pressing means, 7 is a pressing body, 8 is a flange body, 9 is a fluid supply pipe, 10 is a connecting portion, 11 is a pressing bolt, 12 Is an adjustment nut, 13 is a pipe gripper, 14 and 15 are fixing nuts, 16 is a stop plate, 1
7 is a fixing bolt, 18 is a horizontal plate, 19 is a vertical plate, and 20 is a pipe.

The main body 5 is formed in a U-shaped cross section as shown in FIG. 1, and the pipe gripping portions 13 are respectively supported in concave grooves provided inside the upper and lower horizontal plate portions 18. A fixing bolt 17 having its distal end fixed to the pipe gripping portion 13 slidably penetrates the horizontal plate portion 18 of the main body 5 and extends to the upper and lower outer sides, and the fixing nut 14 is screwed to the extended portion. Body 5
The horizontal plate portions 18 are connected to each other by a vertical plate portion 19, and through holes are provided in the vertical plate portion 19 at predetermined intervals to allow the two pressing bolts 11 to slidably pass therethrough. Each pressing bolt 11
Is connected to a flange body 8 slidably penetrating the tubular shaft body 2, and an adjusting bolt 12 is screwed to a rear end part thereof. By rotating the adjustment bolt 12, the collar body 8 is rotated.
Moves in the axial direction.

The stop plate 1 is attached to the shaft 2 on the left side of the flange 8.
6 and two compression bodies 3 having a circular cross section are slidably penetrated, and a fixing nut 15 is screwed on a tip side of the stop plate 16. By adjusting the fixing nut 15, the axial direction of the compression body 3 is adjusted. The position can be adjusted. Note that only one compression body 3 may be provided on the shaft body 2. Further, a pressing body 7 having a circular cross section is fixed to the left side of the flange body 8, and the distal end surface of the pressing body 7 extending in the axial direction is in contact with the end surface of the right compression body 3. The pressing means 6, the flange body 8, the pressing bolt 11, the adjusting nut 12, and the like constitute the pressing means 6 in the present invention.

On the other hand, a fluid supply pipe 9 extending in a right angle direction is connected to the tip of the shaft body 2 on the right side of the flange body 8,
Further, a connecting portion 10 is fixed to a distal end portion of the fluid supply pipe 9. The connection unit 10 includes a fluid supply source (not shown),
For example, a coupler capable of connecting a supply pipe from a supply source of a pressure test fluid such as an air compressor or a pump for pressurizing water with one touch is desirable. The fluid supplied from the supply source is discharged from the connection portion 10 through the fluid supply pipe 9, further through the supply path 4 formed in the shaft body 2, and into the pipe 20 from the distal end.

Next, a method for testing the pressure resistance of piping using the jig of FIG. 1 will be described. First, the supply pipe for the pressure test fluid is connected to the connection part 10, the adjusting nut 12 of each pressing bolt 11 is loosened, and the pressing body 7 is moved to the right in FIG. Next, the fixing nut 14 screwed to each fixing bolt 17 is loosened to widen the interval between the pair of pipe gripping portions 13, and the portion is
Into the end of the. At this time, the shaft body 2 is inserted into the pipe 20 at the same time, and the two compression bodies 3 fixed thereto are positioned in the pipe 20.

Next, the fixing nut 14 is tightened to fix the main body 5 to the pipe 20 by the pipe gripping portion 13, and the adjusting nut 12 is further tightened to move the pressing body 7 to the left in FIG.
The two compression bodies 3 are pressed in the axial direction and compressed. Then, each compressed body 3 expands in the radial direction and its outer peripheral surface is in close contact with the inner peripheral surface of the pipe 20, so that the end of the pipe 20 is closed in an airtight or watertight state.

Next, a fluid for a pressure test is supplied from the fluid supply pipe 9 to the supply path 4 of the shaft body 2 and discharged into the pipe 20 from the tip thereof. Then, the internal pressure of the pipe 20 gradually increases and finally reaches the output pressure set by the fluid supply source, that is, the pressure resistance test pressure. When the pressure test of the pipe 20 is completed, first, the supply of the fluid from the fluid supply source is stopped. Next, by loosening the adjusting nut 12 and returning the compressed body 3 to the original state,
The closed state of the pipe 20 is released and returns to normal pressure. Finally, the fixing nut 14 is loosened to detach the main body 5 from the pipe 20.

FIG. 3 is a view for explaining a pressure resistance test of a pipe using another example of the jig according to the present invention. In the drawing, 1 is a jig, 2 is a shaft body, 3 is a compression body, 4 is a supply path, 6 is a pressing means, 7 is a pressing body, 9 is a fluid supply pipe, 10 is a connection portion, and 11
1 is a pressing bolt, 15 is a fixing nut, 16 is a stop plate, 20 is a pipe, 21 is an adjustment nut, 22 is a lock nut, 23 is a reaction force receiving plate, 24 is a drain funnel, and 25 is a piston. 1 have the same functions as those of FIG. 1.

In FIG. 3, the open end of the small-diameter pipe 20 is connected to the side wall of the large-diameter drain funnel 24. The jig 1 includes a pressing means 6 for compressing the compression body 3. The pressing means 6 is coaxial with a tubular pressing bolt 11, an elongated adjusting nut 21 screwed with the pressing bolt 11, and a distal end of the pressing bolt 11. It has a connected piston 25, a reaction force receiving plate 23 connected to the rear end of the pressing bolt 11, and a lock nut 22 for locking the pressing bolt 11 to the adjusting nut 21. The outer surface of the reaction force receiving plate 23 is desirably formed in an arc shape that matches the inner peripheral surface of the drain funnel 24 in order to improve the fit.

The fluid supply pipe 9 extends vertically into the adjusting nut 21 and communicates with the tubular shaft 2 fixed thereto. The shaft body 2 extends laterally from a portion communicating with the fluid supply pipe 9 and slidably penetrates through the pressing bolt 11 and the piston 25. Two penetrating members 3 similar to FIG. , A stop plate 16 and a fixing nut 15 are provided.

Next, a description will be given of a method for testing the pressure resistance of a pipe using the jig shown in FIG. First, the jig 1 assembled as shown in FIG. 3 is arranged in the drain funnel 24, and the compression body 3, the piston 25 and the like are inserted to a predetermined position in the pipe 20. Next, while holding the piston 25 by hand, the adjustment nut 21 is rotated to extend the pressing bolt 11,
The outer surface of the reaction force receiving plate 23 is brought into contact with the inner peripheral surface of the drain funnel 24.

When the adjusting nut 21 is further rotated, the pressing bolt 11 extends rightward in FIG. 3 with respect to the reaction force receiving plate 23, and the piston 25 presses the two compression bodies 3 in the axial direction to compress them. The compression body 3 expands in the radial direction in proportion to the compression in the axial direction, and its outer peripheral surface is in close contact with the inner peripheral surface of the pipe 20. Thereby, the end of the pipe 20 is connected to the drain funnel 24.
Blocked and sealed to the side. Next, the supply pipe for the pressure test fluid is connected to the connection section 10 at the distal end of the fluid supply section 9 connected to the shaft body 2, thereby completing the preparation for the pressure test of the pipe 20.

Next, when a fluid for a pressure test (not shown) is supplied from the fluid supply pipe 9 to the supply path 4 of the shaft 2, the fluid is discharged from the tip of the supply path 4 into the pipe 20. As the discharge of the fluid continues, the internal pressure of the pipe 20 gradually increases, and finally reaches the output pressure set by the fluid supply source, that is, the pressure test pressure. When the pressure test of the pipe 20 is completed, the supply of the fluid from the fluid supply source is stopped first, and then the supply pipe of the pressure test fluid is removed from the connection portion 10. Next, the adjusting nut 21 is rotated in the reverse direction to reduce the pressing bolt 11, and the jig 1 is separated from the pipe 20.

In each of the above embodiments, the jig of the present invention is used to carry out the pressure resistance test of the pipe 20, but the jig 1 can also be used only for closing the end of the pipe. For example, in the case of performing a pressure resistance test on a pipe system having a plurality of branches, it is necessary to use one open end as a fluid supply port and close the other open end. The jig of the present invention can be effectively used as such a sealing means.

The method of closing the end of the pipe will be described with reference to the jig 1 shown in FIG. 3 as an example. 10 is closed with a closing device such as a cap. As a result, the supply passage 4 of the shaft body 2 is closed, so that the end of the pipe 20 is completely shut off from the outside. When the jig of the present invention is exclusively used for closing, the supply path 4 and the fluid supply path 9 can be omitted from the shaft 2.

[0026]

As described above, the jig according to the present invention includes a compression body having a circular cross section fixed to a shaft, and pressing means for pressing the compression body in the axial direction. When pressed by the pressing means in a state of being inserted into the pipe together with the body, the outer diameter thereof is increased to closely contact the inner wall of the pipe. Therefore, by using this jig, the end can be easily closed without specially processing the piping.

The pressing means in the jig has a main body detachably fixed to the pipe, and a pressing body slidably provided on the main body, so that the pressing body can press the compression body in the axial direction. can do. In this way, the jig can be easily and detachably fixed near the end of the pipe, and the compression body can be compressed in the axial direction by using the main body as a reaction force receiver.

Further, in any one of the above jigs, a supply path for supplying a fluid for a pressure test to the shaft body is formed, and the fluid is introduced into the pipe from the outside in a state where the compression body is brought into close contact with the inner wall of the pipe. Can be configured to be supplied. In this way, after closing the end of the pipe as described above, the pressure test can be performed by supplying the fluid into the pipe.

[0029] Further, a method of using the jig for pressure resistance test of a pipe according to the present invention is to use any one of the above jigs, insert a shaft body and a compression body fixed thereto into the pipe from an end thereof,
The end of the pipe is closed by pressing the compression body by a pressing means. Therefore, according to the present method, the end can be easily closed without specially processing the pipe.

Further, in the method of using the jig for pressure resistance test for piping according to the present invention, a jig provided with a shaft having the above-mentioned supply path is used, and the shaft and the compression body fixed thereto are attached to the piping. Inserting from the end, pressing the compression body by pressing means to block the end of the pipe, then supplying the fluid for the pressure test into the pipe from outside using the supply path and pressurizing it to the predetermined pressure. Features. Therefore, according to this method, the end can be easily closed and the pressure resistance test can be performed without specially processing the piping.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for testing the pressure resistance of a pipe using a jig for a pressure resistance test according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a diagram illustrating a method for testing the pressure resistance of a pipe using another example of the jig according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jig 2 Shaft 3 Compressor 4 Supply path 5 Main body 6 Pressing means 7 Pressing body 8 Flange 9 Fluid supply pipe 10 Connecting part 11 Pressing bolt 12 Adjustment nut 13 Pipe gripping part 14 Fixed nut 15 Fixed nut 16 Stop plate 17 Fixing bolt 18 Horizontal plate part 19 Vertical plate part 20 Piping 21 Adjustment nut 22 Lock nut 23 Reaction force receiving plate 24 Drain funnel 25 Piston

Claims (5)

[Claims] A jig used for a pressure test of a pipe, comprising: a shaft body (2) insertable from an end of the pipe into the inside; and a compression body having a circular cross section provided on the shaft body (2). (3) and pressing means (6) for pressing the compressed body (3) in the axial direction. The compressed body (3) is pressed together with the shaft body (2) in a state inserted into the pipe (20). A jig for a pressure test of a pipe, wherein the jig is configured so that when pressed by the means (6), its outer diameter is enlarged to be in close contact with the inner wall of the pipe. 2. The pressing means (6) has a main body (5) detachably fixed to a pipe (20) and a pressing body (7) slidably provided on the main body (5). 2. The jig for a pressure resistance test of a pipe according to claim 1, wherein the pressing body (7) is configured to press the compression body (3) in the axial direction. 3. A supply path (4) for supplying a fluid for a pressure test to the shaft body (2) is formed.
3. A jig for a pressure test of a pipe according to claim 1 or 2, wherein the jig is configured so that the fluid can be supplied from outside to the pipe (20) in a state where (3) is in close contact with the pipe. . 4. A method for closing an end of a pipe during a pressure test of a pipe, wherein the jig according to any one of claims 1 to 3 is used to fix the shaft (2) and the jig. Pipe (2)
A method for using a jig for a pressure test of pipes, wherein the jig is inserted into the inside from the end of (0), and the end of the pipe is closed by pressing the compression body (3) by pressing means (6). 5. The method for testing pressure resistance of a pipe according to claim 3, wherein
Using the jig described in (2), connect the shaft (2) and the compressed body (3)
And presses the compression body (3) by a pressing means (6) to seal off the pipe end, and then feeds the pipe (9)
A method for using a jig for a pressure test of a pipe, wherein a fluid for a pressure test is supplied from the outside into the pipe (20) using a pressure source and pressurized to a predetermined pressure.