JP2003161669A - External hydraulic pressure test device for connector part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external hydraulic pressure test device for a connector part which can be installed from outside a pipe so as to easily do a test. <P>SOLUTION: In the device, the connector 5 inserts a loading slot 2 into a receiving port 1 via a sealing rubber ring 3 to seal the connector part. The connector 5 is provided with a retainer ring 13 engaging with an outer face of the receiving port 1, a ring body for a hydraulic room 16 to water-tightly be seated on an open end of the receiving slot, a fastening tool tightening both the ring body for a hydraulic room 16 and the retainer ring 13, a seal rubber 20 to be inserted between an open side face 19 of the ring body for a hydraulic room 16 and the outer face of the loading port 2, and a sealing ring 21 for the open side face 19 of the ring body for a hydraulic room 16. Thus a pressurized water for testing W can be infused or discharged from a through hole 15 into a space 23 surrounded with the sealing rubber ring 3 in the connector 5, an inner face of rather the open end side receiving port 1, an inner face of the ring body for a hydraulic room 16 and the sealing ring 21. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for testing the external water pressure of a pipe joint. [0002] Testing the water tightness of a pipeline joint is very important in confirming the fluid transfer function of the entire pipeline. [0003] In particular, pipes buried in soil with groundwater need to be sealed so that groundwater does not flow into the pipes from the outside. The cylindrical body 6 is externally fitted on the outer periphery of the pipe joint 5 which is inserted and connected to the socket 1 by inserting the pipe opening 2 by compressing and inserting a rubber ring for sealing. The flanges 7 and 7 are abutted on the end surface of the cylindrical body 6 via packing (not shown), and are fastened with bolts and nuts 8 to be joined in a watertight manner. Is sealed with water-stopping rubbers 9, 9 to form a pressure chamber composed of the cylindrical body 6 and the flanges 7, 7. Pressurized water W for test is supplied to this pressure chamber, and a pressure gauge (not shown) The internal pressure is reduced by the 2. Description of the Related Art There is known an apparatus which visually confirms water to check whether or not the sealing property from the outside of the tube to the inside of the tube is good. [0004] However, the above-mentioned external water pressure test apparatus for a pipe joint requires a cylindrical body 6 that covers the entire pipe joint 5 for a pressure chamber. There is a problem that it takes a lot of time and labor to transport and pressurized water due to the large volume of the pressure chamber. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is an object of the present invention to easily and easily carry out a water leakage test from outside a pipe. [0006] An external water pressure test apparatus for a pipe joint according to the present invention inserts an insertion hole formed at one end of another pipe into a receptacle formed at one end of the pipe. In a pipe joint in which a sealing rubber ring is interposed between the inner surface of the socket and the outer surface of the insertion hole to seal the pipe joint portion, a locking ring engaged with the outer surface of the socket, A ring body for watertightly contacting a receiving port opening end surface, wherein a ring body for a hydraulic chamber provided with a through hole for test pressurized water opened, and a ring body for the hydraulic chamber provided on the locking ring; Direction, and a fastener that presses the hydraulic chamber ring body to the receiving port opening end face in a watertight manner, and a seal rubber inserted between an open side surface of the hydraulic chamber ring body and the insertion port outer surface, The sealing rubber is pressed into contact with the open end surface and the outer surface of the insertion opening of the ring body for forming a hydraulic chamber. A sealing ring, and a sealing rubber ring in the pipe joint and a receiving inner surface on an opening end side thereof, a space surrounded by the inner surface of the hydraulic chamber ring and a sealing ring. The test pressurized water can be injected and discharged. That is, in the apparatus for testing the external water pressure of a pipe joint according to the present invention, a locking ring, a water pressure chamber forming ring, and a sealing ring are watertightly fastened to the outer surface of the pipe joint with respective fasteners, and these are sealed. A sealed space surrounded by a rubber ring is formed, water pressure is applied to this space, and the presence or absence of a change in the water pressure is observed to determine whether the sealing rubber has leaked from outside the pipe. Testing can be performed reliably. Next, an apparatus for testing the outside water pressure of a pipe joint according to the present invention will be described. FIG. 1 is a cross-sectional view of a main part of an external water pressure test device for a pipe joint according to an embodiment of the present invention;
FIG. 2 is a perspective view showing a disassembled state. In FIG. 1, reference numeral 10 denotes a pipe, which in this embodiment is a metal pipe such as a ductile cast iron pipe. This pipe 10 has a receiving port 1 formed at one end and an insertion port 2 at the other end.
By inserting the insertion port 2 of the other pipe 10 through the connector, water-tight connection is possible. A receiving groove 11 is formed on the inner surface of the receiving port 1 so that the sealing rubber ring 3 does not move when the insertion port 2 is inserted.
Is compressed so that the space between the inner surface of the receiving port 1 and the outer surface of the insertion port 2 is sealed in a watertight manner. In FIG. 1 and FIG. 2, on the outer surface of the receptacle 1,
A locking ring 13 that engages in the axial direction is externally fitted by utilizing the enlarged diameter portion 12 on the outer surface of the receptacle 1, and the opening end face 9 of the receptacle 1 is provided.
And a ring 16 for a hydraulic chamber having a center hole 14 that penetrates the insertion opening 2 can be tightened in the axial direction by a fastener 18 such as a bolt and nut. This donut-shaped ring body 1 for a hydraulic pressure chamber
6 is provided with through holes 15, 15 through which the test pressurized water flows on the inner surface of the center hole 14, and the respective through holes 15, 15 are provided.
Is provided with a supply pipe 24 for supplying the test pressurized water W from a pressurized water supply device (not shown) and a discharge pipe 25 for discharging the test pressurized water W from the space 23.
A pressure gauge 26 for measuring the water pressure in the apparatus 3 is provided. In the drawing, reference numeral 17 denotes a ring-shaped packing inserted between the ring body 16 for the hydraulic chamber and the end face 9 of the opening of the receiving port. Watertightly seal between the sides of. The open side of the hydraulic chamber ring body 16, ie,
The other end of the center hole 14 is a tapered inner surface 19 that expands outward in a tapered shape. Here, the case where the tapered inner surface 19 is provided only on the open side surface is shown, but it may be provided on both surfaces so that there is no distinction between front and back when the hydraulic chamber ring body 16 is attached. A seal rubber 20 is interposed between the tapered inner surface 19 and the outer surface of the insertion opening 2 to form a sealing ring 21.
Is pressed against the hydraulic chamber ring member 16 with a fastener 22 such as a bolt, thereby compressing the seal rubber 20, and sealing rubber ring 3 and the inner surface of the receiving port 1 in the pipe joint, the inner surface of the hydraulic chamber ring member 16 and Space 23 surrounded by sealing ring 21
Is to be a closed space. In the above description, the sealing ring 21
In order not to interfere with the fastening nut of the fastener 18, a corresponding portion is cut out as shown in FIG. Next, the method of the water pressure test of the pipe joint will be described. First, the socket 1 in which the locking ring 13 is tapped
Then, the sealing ring 21, the sealing rubber 20, the ring body 16 for the hydraulic pressure chamber, and the insertion port 2 of the other pipe whose ring-shaped packing 17 is tapped on the outer periphery thereof are inserted and connected after inserting the rubber ring 3 for sealing. Join the tubes. Next, a plurality of fasteners 1 in which the locking ring 13 and the ring body 16 for hydraulic chambers are uniformly distributed in the circumferential direction.
8… and tighten evenly to make ring-shaped packing 17
To make it watertight. Next, the ring member 16 for the hydraulic chamber and the sealing ring 21 are similarly fastened with a plurality of fasteners 22 which are uniformly distributed in the circumferential direction, and the sealing rubber 20 is attached to the open side surface of the ring member 16 for the hydraulic chamber. The space 23 is made watertight by being compressed and inserted between the tapered inner surface 19 and the outer surface of the insertion opening 2. Then, the discharge pipe 25 is opened, and the supply pipe 24 is opened.
Supply the test pressurized water W into the space 23, and when the space 23 is full and the test pressurized water W flows out from the discharge pipe 25, the discharge pipe 25 is closed. Is supplied under pressure until the pressure becomes constant, and when the pressure becomes constant, the supply pipe 24 is also closed. Then, the water pressure in the space 23 is observed by the pressure gauge 26. If the water pressure decreases by a certain amount within a certain time, it is determined that there is a leak from the outside of the pipe into the pipe. Judge. At this time, the pipe joint is observed from inside the pipe, and the state and presence or absence of water leakage are visually observed. As described above, according to the apparatus for testing the external water pressure of the pipe joint, the watertightness from the outside of the pipe such as the sealing rubber ring 3 of the pipe joint can be reliably and easily attached to the outer periphery of the pipe. Can be tested. Further, as another configuration example of the above-described embodiment, if the locking ring 13, the hydraulic pressure chamber ring 16, the sealing ring 21, and the like are provided as two-piece fittings, even if it is an existing pipe joint, it can be used as a pipe. An external water pressure test can also be performed externally. As described above, according to the apparatus for testing the outside water pressure of a pipe joint according to the present invention, the sealing performance against the outside water pressure of groundwater or the like can be reliably tested by installing the pipe from the outside of the pipe. In addition, it is possible to perform a watertightness test only with a simple mounting operation without requiring a large-scale device such as a hydraulic chamber.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of an external water pressure testing device for a pipe joint according to an embodiment of the present invention. FIG. 2 is an exploded perspective view illustrating an attached state of an external water pressure test device for a pipe joint according to an embodiment of the present invention. FIG. 3 is a sectional view of a main part of a conventional hydraulic test device for a pipe joint. [Description of Signs] 1 Receiving port 2 Insertion opening 3 Rubber ring 4 for sealing 4 Pressing ring 5 Pipe joint 10 Pipe 11 Rubber ring storage groove 12 for sealing 12 Large diameter portion 13 Locking ring 14 Center hole 15 Through hole 16 Ring for hydraulic chamber 17 Ring-shaped packing 18 Fastener 19 Open-side tapered surface 20 Seal rubber 21 Sealing ring

Claims (1)

[Claim 1] An insertion hole formed at one end of another tube is inserted into a reception hole formed at one end of a tube, and between the inner surface of the reception hole and the outer surface of the insertion hole. In a pipe joint in which a pipe joint portion is sealed by inserting a rubber ring for sealing, a locking ring that engages with the outer surface of the receiving port and a ring body that comes into contact with the receiving port opening end face in a watertight manner. A ring body for a hydraulic chamber provided with a through-hole for the pressurized test water, and a ring body for a hydraulic chamber connected to the locking ring in an axial direction, and the ring member for a hydraulic chamber is received by the receiving ring. A fastener that is pressed against the mouth opening end face in a watertight manner, a seal rubber interposed between the open side surface of the hydraulic chamber ring body and the outer surface of the insertion opening, and an open side end face of the seal rubber for molding the hydraulic chamber ring body And a sealing ring pressed against the outer surface of the insertion opening, and a rubber ring for sealing in the pipe joint is provided. An external water pressure test of a pipe joint portion capable of injecting and discharging test pressurized water from the through hole into a space defined by the inner surface of the receiving port on the opening end side, the inner surface of the ring for the hydraulic pressure chamber, and the sealing ring. apparatus.