JP2008026022A - Hydraulic testing device for pipe joint section and hydraulic test method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic test method for pipe joint section easy to fixing and good in workability and a hydraulic test method using the same. <P>SOLUTION: The hydraulic testing device for pipe joint section includes: a hydraulic test device body 3 divided on a peripheral direction into a plurality of pieces, tight closely mountable on the joint sections while surrounding the joint sections of pipes 1, 2; a lock screw 6 mounted on the hydraulic test device body 3, abutting to the external surface of the pipe 1 for preventing the hydraulic test device body 3 from getting out; seal means 8 and 9 for sealing the internal space of the hydraulic testing device body 3 surrounding the joint section; and a hole 16 capable of introducing the pressurized water into the hydraulic testing device body 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water pressure test apparatus for a pipe joint part and a water pressure test method using the apparatus, and more particularly, to a pipe joint for inspecting the sealability of a pipe joint part by sealingly fitting so as to surround the joint parts of the pipes. The present invention relates to a water pressure test apparatus for water and a water pressure test method using the same.

  When installing fluid pipes that are constructed by sequentially constructing pipe joints with other pipes inserted into one pipe, a predetermined pressure is used as an airtightness test to determine whether fluid leaks from the joints between the pipes. The method of inspecting the change of water pressure is applied. In particular, in the case of a pipe provided with a pipe joint portion having an expansion / contraction function, it is necessary to fix the pipes so that they do not expand / contract before the water pressure test. If water pressure is applied without fixing the pipes together, the water pressure moves the pipes in a direction that separates them, causing the pipes to meander, and in the worst case, the pipes extend completely, losing the expansion and contraction function. Because it will end up. Therefore, conventionally, pipes connected to a plurality of pipes of a predetermined length are sealed with plugs or the like, and the pipes are buried in the soil and the earth pressure (weight of the earth) is used to connect the pipes. A test was conducted to prevent movement and apply water pressure.

  This method has a drawback in that if the water pressure does not increase and it is determined that there is a leak location, the leak location cannot be specified unless the covered soil is removed.

  Therefore, in order to eliminate such drawbacks, even if fluid leaks from the joint portion, the leak does not expand, and as a device that limits leakage to the joint portion, the joint portion is covered with a closed space forming member, and is formed by this member. An invention has been proposed in which a joint portion is accommodated in a space, air or water is filled in the space, and leakage is determined from a pressure change (for example, Patent Document 1).

JP 2001-59794 A

  However, the closed space forming member of the above prior art is composed of a substantially cylindrical body having a drum shape having a diameter considerably larger than the tube diameter, and covers the entire joint portion. Therefore, from the joint portion that joins the pipes together. It is necessary to overhang and occupy a wide space area, and not only cannot be installed in places where other facilities are arranged in the surroundings, but also the handling is troublesome and the workability is poor.

  Accordingly, an object of the present invention is to provide a water pressure test apparatus for a pipe joint part that can be configured compactly as a whole, can be easily attached to the pipe joint part, and has good workability, and a water pressure test method using the same. It is in.

  The above-mentioned subject is achieved by the invention described in each claim. That is, the characteristic configuration of the hydraulic test device for a pipe joint part according to the present invention is divided into a plurality of parts in the circumferential direction, and a hydraulic test apparatus main body that can be hermetically mounted so as to surround the joint parts of the pipes, The hydraulic pressure test apparatus main body is attached to the outer surface of one of the pipes, and engages with the locking means which acts to prevent the hydraulic pressure test apparatus main body from coming out of the joint portion, and the water pressure surrounding the joint portion. A sealing means for sealing the internal space of the test apparatus main body and an opening hole through which pressurized water can be introduced into the hydraulic pressure test apparatus main body are provided.

  According to this configuration, it is possible to easily and surely surround the joint portion between the pipes by reducing the exclusive space without having a portion projecting greatly from the joint portion, and the hydraulic pressure test device main body from the joint portion. Even if the hydraulic pressure is applied, the leaking portion can be detected with certainty by the locking means that acts to prevent the escape of the leak.

  As a result, it was possible to provide a hydraulic pressure testing apparatus for a pipe joint part that can be compactly configured as a whole, can be easily attached to the pipe joint part, and has good workability.

  The joint portion is coupled by inserting a tube having an insertion port into a tube having a receiving port, and the hydraulic pressure test device main body has a contact portion that contacts an end surface of the tube having a receiving port. At the same time, it is preferable that the locking means abuts and locks against the outer surface of the pipe having the receiving port.

  According to this configuration, when the water pressure test is performed, positioning when installing the water pressure test apparatus main body is easy, and when the water pressure is applied, it is possible to reliably and firmly prevent the joint portion from coming out.

  It is preferable that the tip of the locking means that contacts the outer surface of the tube is formed in an edge shape that can bite into the tube.

  According to this configuration, when water pressure is applied, the tip of the locking means can effectively resist the movement of the water pressure test apparatus main body to be separated from the pipe joint portion by the water pressure.

  Moreover, the characteristic structure of the water pressure test method of the pipe joint part which concerns on this invention sealed the water pressure test apparatus of the pipe joint part of any one of Claims 1-4 so that the joint part of pipes may be enclosed. It is to inspect for water leakage by mounting, introducing pressurized water into an opening provided in the main body of the water pressure test apparatus, and measuring the water pressure.

  According to this structure, the whole can be comprised compactly, the attachment to a pipe joint part is easy, and the hydraulic test method of a pipe joint part with good workability | operativity can be provided.

  An embodiment of a water pressure test apparatus according to the present invention will be described in detail with reference to the drawings, taking as an example a case where the water pressure test apparatus is attached to a pipe joint having a telescopic mechanism. FIG. 1 shows a state in which a water pressure test apparatus according to the present embodiment is mounted on a pipe joint portion in which a tube 2 having an insertion port is inserted and joined to a tube 1 having a receiving port at an end portion. 2 shows a front structure, and FIG. 2 shows a cross-sectional structure of the upper half of the hydraulic pressure test apparatus 3 in which the portion A in FIG. 1 is enlarged.

  As shown in FIG. 2, the water pressure preventing device has a main body 3 which is divided into an upper half 3a and a lower half 3b, and a flange portion 4a of the upper half 3a and a flange portion of the lower half 3b. By fastening and fixing 4b with a fastener 5 such as a bolt and a nut, water stopping performance by pressure bonding of the rubber packing and rotation prevention around the pipe are achieved. Since the hydraulic pressure test device main body 3 is thus divided into two parts in the upper and lower directions, the mounting operation is facilitated and the disassembly after the end of the test is facilitated. Of course, the hydraulic pressure test apparatus main body 3 may be divided into three parts, and is not limited to the number.

  Furthermore, the water pressure test apparatus main body 3 has a stepped structure so that it can be fitted to the joint portions of the existing water pipes 1 and 2 having different outer diameters. On the other hand, a small space S is formed. The large-diameter pipe 1 having a receiving port is pressed and locked by a pressing screw 6 which is a locking means screwed to the upper half 3a and the lower half 3b. As shown in FIGS. 1 and 2, the push screw 6 is attached to an arm portion 3 c that integrally projects from the hydraulic pressure test apparatus main body 3, and its tip is formed at a sharp edge portion 6 a. 1 bites into the outer surface. Therefore, when water pressure is applied, the water pressure can effectively and strongly resist the movement of the water pressure test apparatus main body away from the pipe joint portion. The arm 3c provided in each of the upper and lower halves 3a and 3b has an opening hole 16, which can be connected to a hydraulic pressure test hose, as will be described later. The plug 10 that closes the opening hole 16 is screwed before the hydraulic test hose is connected. Of the pair of plugs 10, normally, the upper plug 10 is opened and connected to the hose, and the other plug 10 is opened when the water pressure test is completed, and the water accumulated in the space is discharged. used.

  Further, the open end side of the large diameter pipe 1 has a receiving step portion 1a formed to have a somewhat large diameter, and the hydraulic pressure test device main body 3 is formed on the outer surface which is the end face of the receiving step portion 1a. Of the contact portion (not shown, but formed in a convex shape at four substantially equal intervals on the inner peripheral surface side of the hydraulic pressure test device body 3), in this state, The set screw 6 is pressed against the outer surface of the tube 1 and fixed. In this case, when the hydraulic pressure test apparatus main body 3 is displaced in the direction of coming out of the pipe 1 due to the pressure of the leaked water, the withdrawal of the main pipe is prevented by the resistance of the push screw 6. The push screw 6 moves while resisting and comes into contact with the outer peripheral portion of the receiving stepped portion 1a to prevent the tube 1 from coming out. Meanwhile, since the water tightness in the joint portion is maintained by the rubber packing which is a sealing means described below, the water inside the pipe does not leak out of the hydraulic pressure test apparatus. Note that FIG. 20 is a C-shaped or circular ring-shaped lock ring that exerts a retaining action when an external force is applied in the direction in which the tube 2 is separated from the tube 1. This is a centering member made of an elastic material and having the same shape as the lock ring 20 for centering the ring 20 for positioning. Reference numeral 8 is a rubber ring for sealing a joint portion that is fitted in and attached to a recess provided on the inner peripheral surface of the tube 1, and is pressed on the inner peripheral surface of the tube 1 and the outer peripheral surface of the tube 2. Demonstrates the sealing function.

  In order to prevent fluid leakage at the joint portion, a rubber attachment 9 is formed on the inner peripheral surface of the hydraulic pressure test device main body 3 facing the receiving stepped portion 1a, and a rubber packing 9 is attached. Also, a water-tight rubber packing 9 is fitted into and attached to a recess provided on the inner peripheral surface of the hydraulic pressure test apparatus main body 3, and this rubber packing 9 is attached to the outer surfaces of the pipes 1 and 2. Close contact and secure water tightness. As shown in FIG. 3, the rubber packing 9 is formed in a semicircular shape having a large-diameter portion 9a and a small-diameter portion 9b that are connected to each other. 3 are attached to the upper half 3a and the lower half 3b. Note that FIG. 3 is shown reversely in the relationship with FIG.

<Water pressure test method>
Next, a method for performing a water pressure test by attaching the water pressure test apparatus main body 3 to the joint portion will be described. After the water pressure test device body 3 is attached to the joints of the water pipes 1 and 2, the plug 10 screwed into the opening 16 of the arm 3 c of the water pressure test device body 3 is removed and connected to the water pressure test pump 12. A hose 13 is attached. In this case, a metal fitting 14 that can be screwed into the opening hole 16 of the arm portion 3c is attached to the tip of the hose 13, and the metal fitting 14 is screwed into the opening hole 16 to be connected in a watertight manner.

  Then, pressurized water is introduced into the opening hole 16 provided in the hydraulic pressure testing device main body 3 through the hose 13 by the hydraulic pressure test pump 12, the small space S is filled with water, and the hydraulic pressure is measured by the hydraulic pressure gauge 15. Check for leaks. When the rubber band 8 for sealing is insufficient, the pressurized water leaks from the location and the water pressure decreases, and the predetermined water pressure is not displayed on the water pressure gauge. it can.

  In this way, by mounting the hydraulic test apparatus main body 3 that is compact and easy to mount on the pipe joint, the seal state of the joint can be easily inspected. Moreover, since only the small space S is filled with water, the amount of water used for the water pressure test is small, and the time required for the water pressure test is short.

[Another embodiment]
(1) In the above-described embodiment, an example of a hydraulic pressure test apparatus for a joint portion having a combination of a tube 1 having a receiving port and a tube 2 having an insertion port having the same diameter is shown. The same effect can be exhibited for different shaped tubes.

  (2) In the above embodiment, the water pipe is taken as an example of the pipe, but the fluid flowing through the pipe is not limited to water, and may be an aqueous solution or other fluid.

The fragmentary front view of the pipe joint part of the piping equipped with the water pressure test apparatus according to one embodiment of the present invention Upper half sectional view of the water pressure test apparatus of FIG. Perspective view of sealing means attached to the hydraulic pressure testing device body

Explanation of symbols

1, 2 Tube 3 Hydraulic test device body 6 Locking means 9 Sealing means 16 Opening hole

Claims (5)

Divided into a plurality of parts in the circumferential direction, the main body of the water pressure tester that can be hermetically fitted so as to surround the joints of the pipes, and the water pressure tester main body are attached to the outer surface of one of the pipes And a locking means that acts to prevent the hydraulic test apparatus body from coming out of the joint, a sealing means that seals an internal space of the hydraulic test apparatus that surrounds the joint, and the hydraulic test apparatus main body. A water pressure test device for a pipe joint portion provided with an opening hole through which pressurized water can be introduced. The joint portion is coupled by inserting a tube having an insertion port into a tube having a receiving port, and the hydraulic pressure test device main body has a contact portion that contacts an end surface of the tube having a receiving port. The hydraulic test apparatus for a pipe joint portion according to claim 1, wherein the locking means contacts and locks to the outer surface of the pipe having a receiving port. The water pressure test apparatus for a pipe joint part according to claim 1 or 2, wherein a tip end of the locking means contacting the outer surface of the pipe is formed in an edge shape that can bite into the pipe. The water pressure of a pipe joint part according to any one of claims 1 to 3, wherein the sealing means seals the outer surface of the pipe having a receiving port and the outer surface of the pipe having an insertion port in close contact with each other. Test equipment. The pipe joint part hydraulic pressure test apparatus according to any one of claims 1 to 4 is hermetically mounted so as to surround the joint parts of the pipes, and pressurized water is supplied to an opening hole provided in the hydraulic pressure test apparatus main body. Water pressure test method for pipe joints that introduces and measures water leakage by measuring water pressure.

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