JP2016180596A - Water tightness testing device, and water tightness testing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for filling the test section with water.SOLUTION: A first plug 10 and a second plug 11 that expand by pumping air are connected to a compressor C through a first vent pipe 12 and a second vent pipe 13. A water flow pipe 14 penetrating the first plug 10 and having an outlet projecting toward the second plug 11 is connected to a water supply pump P2 through a water supply tube 17 and to an exhaust pipe 19 penetrating the second plug 11 and projecting toward the first plug 10. An tip of a projection portion 19c of the exhaust pipe 19 is provided with a float 20 floating on the water. When water is injected from an outlet 14a of the water flow pipe 14 into a test section and the test section is filled with water, the float on the water causes the tip of the projection portion 19c of the exhaust pipe 19 to come to the upper end of the test section and the air in the test section is discharged from that tip through the exhaust pipe 19.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water tightness test apparatus used for testing the water tightness performance of pipe joints such as reinforced plastic composite pipes (FRPM pipes) and cast iron pipes, and a water tightness test method using the water tightness test equipment.

  When a pipe line is constructed by burying pipes such as FRPM pipes in the ground, a plurality of pipes having a predetermined length are sequentially inserted and joined using pipe joints. After the pipeline is constructed in the ground, it is not preferable that leakage occurs in the pipeline, and a watertight test of the joint portion is performed (see Patent Document 1).

  The water-tight (liquid-tight) test apparatus described in Patent Document 1 seals a predetermined test section including a pipe joint in a pipe line with a pair of plugs that expand when filled with air, and the sealed test section The fluid is fed into the chamber and the pressure is measured for a predetermined time to test the sealing performance of the test section.

JP 2009-243895 A

  The test apparatus described in Patent Document 1 is applicable to a watertight test by feeding a liquid as a fluid into a sealed test section. When the liquid is fed into the sealed test section, the air in the test section is compressed without being discharged to the outside.

  When the air is compressed, the air pressure in the test section becomes high, and it becomes difficult to feed the liquid into the test section. For this reason, the test section could not be filled with liquid, and there was a possibility that it would be difficult to measure the water pressure in the test section.

  Further, when the air pressure in the test section is increased, there is a problem that the air pressure is applied to the pair of plugs and the plug is not fixed in the pipeline, and the sealed state of the test section cannot be maintained.

  Therefore, an object of the present invention is to make it possible to fill the test section with water.

In order to solve the above-described problems, a watertight test apparatus according to the present invention includes a pair of plugs that expand when air is introduced, a vent pipe connected to the pair of plugs, and a first of the pair of plugs. A water pipe having a discharge port penetrating one plug and projecting toward the second plug, an air supply means for supplying air to the vent pipe, a water supply means for supplying water to the water pipe, and the pair of In a watertight test apparatus comprising a measuring instrument for measuring a pressure in a test section formed between plugs,
An exhaust pipe that penetrates one of the pair of plugs and protrudes toward the other plug, and a float that floats on water that is fixed to the tip of the projecting portion of the exhaust pipe; Can adopt a configuration in which the tip of the protruding portion has a length that reaches the upper end of the test section.

  According to the above configuration, water is injected into the test section formed by the pair of plugs from the water supply means through the water injection pipe, and the air in the test section is discharged to the outside from the front end of the protrusion of the exhaust pipe due to the rise of the water surface.

  Moreover, even if water is injected into the test section and the water level becomes high, the tip of the protrusion of the exhaust pipe is located above the water level and reaches the upper end of the test section due to the float floating in the water. For this reason, the air in a test area can be discharged | emitted from the protrusion front-end | tip part of the exhaust pipe located in the upper end part in a test area until it fills with water in a test area.

  The said structure WHEREIN: The ventilation pipe which sends air to said 2nd plug can employ | adopt the structure connected to the said 2nd plug from the discharge port through the inside of the water flow pipe of said 1st plug. According to this configuration, the vent pipe that sends air to the second plug is accommodated in the water pipe penetrating the first plug, and thus does not get entangled with the water pipe in the first plug.

  In order to solve the above-mentioned problems, a watertight test method of the present invention is a watertight test method using the above watertight test apparatus, wherein the pair of plugs are arranged in a pipe line at intervals in the pipe axis direction. Then, air is introduced into the pair of plugs through the ventilation pipe from the air supply means, the pair of plugs is inflated to adhere to the inner wall surface of the pipe line, and the air in the test section is discharged through the exhaust pipe. However, water is injected into the test section through the water supply pipe from the water supply means, the test section is filled with water, and the tip of the projecting portion of the exhaust pipe reaches the upper end of the pipe line by the float. In this state, a device that measures the pressure in the test section with the measuring device can be employed.

  As described above, according to the present invention, the air in the test section is discharged from the tip of the projecting portion of the exhaust pipe to the outside of the test section while water is injected from the water supply means through the water supply pipe into the test section. Can be prevented from rising.

  In addition, because the float floats on the water, the tip of the protruding part of the exhaust pipe is located above the water level and reaches the upper end of the pipe, so that the air in the test section passes through the exhaust pipe until the test section is filled with water. Can be injected while discharging the water outside the test section.

The perspective view of the water-tightness testing device of an embodiment Enlarged side view of the main part of the water-tightness test equipment (A) Sectional view taken along line AA in FIG. 2, (b) Sectional view taken along line BB in FIG. (A) Schematic diagram showing the state before use of the watertight test device, (b) Schematic diagram showing the state where the second plug of the watertight test device is inflated, (c) State where the pair of plugs of the watertight test device are inflated Schematic showing, (A) Schematic diagram showing a state of water injection into the test section, (b) Schematic diagram showing a condition in which the test section is filled with water

Hereinafter, a watertight test apparatus according to an embodiment of the present invention will be described with reference to FIGS.
The water-tightness test apparatus of this embodiment is constructed by inserting and joining subsequent pipes 2 in order to a preceding pipe 1 such as an FRPM pipe, a concrete pipe, a steel pipe, a cast iron pipe, etc. having a predetermined length using a pipe joint 3a. It is used when testing the watertight performance of the joint 3 in the existing pipeline.

  As shown in FIG. 1, the water tightness test apparatus includes a pair of a first plug 10 and a second plug 11, a first vent pipe 12 and a second vent pipe 13 connected to each of them, and a first plug 10. , A compressor C as an air supply means for supplying air to the first vent pipe 12 and the second vent pipe 13, and a water supply pump P1 and a water supply as water supply means for supplying water to the water pipe 14 A vehicle P2 and a measuring device 18 for measuring the pressure in the test section T formed between the first plug 10 and the second plug 11 are provided.

  The water-tightness test apparatus further includes an exhaust pipe 19 that penetrates through the second plug 11 and projects toward the first plug 10, and a float 20 that is fixed to the tip of the projecting portion 19 c of the exhaust pipe 19.

  The first plug 10 is formed of a cylindrical body 10a made of synthetic rubber and cap portions 10b and 10c that close both end faces of the cylindrical body 10a, and a water pipe 14 passes therethrough. The cylindrical main body 10a is formed to be stretchable so that it swells outward in the radial direction when air is introduced therein and contracts when the air inside is discharged.

  The cap parts 10b and 10c are formed from a circular metal plate. The cap portion 10b on the one end side has a water passage pipe 14 passing through the center, the first vent pipe 12 is connected to the outer side in the radial direction than the water duct 14, and the first vent pipe 12 is connected to the cylindrical main body 10a.

  In the cap portion 10c on the other end side, a water conduit 14 passing through the cap portion 10b and passing through the inside of the cylindrical main body 10a penetrates in the center. A discharge port 14a is formed at the tip of the water pipe 14 protruding from the cap portion 10b.

  Similar to the first plug 10, the second plug 11 is formed of a synthetic rubber cylindrical main body 11a and cap portions 11b and 11c that close both end surfaces of the cylindrical main body 11a, and the exhaust pipe 19 passes therethrough. .

  The cap parts 11b and 11c are formed from a circular metal plate. The cap 11b on one end side has an exhaust pipe 19 passing through the center, a second vent pipe 13 is connected to the radially outer side of the exhaust pipe 19, and the second vent pipe 13 is connected to the cylindrical body 11a.

  In the cap portion 11c on the other end side, an exhaust pipe 19 that passes through the cap portion 11b and passes through the inside of the cylindrical main body 11a passes through the center.

  The first vent pipe 12 is a tube having pressure resistance and flexibility, for example, a nylon tube. One end of the first vent pipe 12 is connected to the branch pipe 15 a via the regulator 12 a and the other end is connected to the first plug 10.

  The second vent pipe 13 is the same type of tube as the first vent pipe 12, and one end thereof is connected to the branch pipe 15a via the regulator 13a. Further, as shown in FIG. 1, the second vent pipe 13 passes from a branch pipe 14 b to be described later of the water pipe 14 through the water pipe 14, protrudes from the discharge port 14 a of the water pipe 14, and the other end is the second plug. 11 is connected.

  The compressor C is a device that supplies compressed air. An air supply tube 15, which is a vent pipe connected to the compressor C, is connected to the branch pipe 15 a, and the first plug is passed through the first vent pipe 12 and the second vent pipe 13. Air is supplied to 10 and the second plug 11.

  As shown in FIG. 1, one end of the water conduit 14 is connected to the branch pipe 14b, penetrates through the first plug 10 as described above, protrudes from the cap portion 10c, and a discharge port 14a is formed in the protrusion. Yes.

  Further, as shown in FIG. 3A, the water pipe 14 has a double structure in which the second vent pipe 13 is disposed from the branch pipe 14b to the discharge port 14a. For this reason, the water which passes the inside of the water flow pipe 14 flows the outer side of the 2nd ventilation pipe 13, and is discharged in the test area T from the discharge outlet 14a.

  The branch pipe 14 b branches into two branches from the connection end of the water pipe 14. A water supply tube 16 connected to the water supply pump P1 is connected to one branch end of the branch pipe 14b via a valve 16a. A water supply tube 17 connected to the water supply vehicle P2 is connected to the other branch end via a valve 17a.

  The water supply tubes 16 and 17 are flexible tubes that can withstand high water pressure, and are detachably connected to the bifurcated branch ends of the branch pipe 14b by sockets (not shown).

  The water supply pump P1 supplies the water stored outside to the water supply tube 16 which is a water pipe with a built-in pump (not shown). The water supply tube 16 is connected between the valve 16a and the branch pipe 14b with a measuring device 18 for measuring the pressure in the test section. A water pressure gauge can be applied to the measuring device 18.

  The water supply vehicle P2 supplies water in a tank to be mounted to a water supply tube 17 which is a water pipe. As the water supply means, the water supply pump P1 or the water supply vehicle P2 is appropriately selected depending on the inner diameter of the pipe, the position of the test section T in the pipe, and the like.

  The exhaust pipe 19 is a tube having pressure resistance and flexibility, and a valve 19a is connected in the vicinity of one end. Further, as shown in FIG. 1, the exhaust pipe 19 penetrates the second plug 11 from the cap portion 11c side, and the other end portion faces the first plug 10 via a joint 19b fixed to the cap portion 11b. Protruding.

  The protrusion 19c of the exhaust pipe 19 is a pressure-resistant and flexible tube that extends upward from the joint 19b, and the float 20 penetrates and is fixed to the tip of the tube (see the solid line in FIG. 3B). Further, the protrusion 19c of the exhaust pipe 19 has a length that reaches the upper end of the preceding pipe 1, that is, the upper end of the test section T when the tip is positioned upward (FIG. 3). (B) Refer to a two-dot chain line).

  The float 20 is formed in a spherical shape, and the protruding portion 19c of the exhaust pipe 19 penetrates in the diameter direction. The float 20 has water resistance and can float on water, for example, a plastic molded product.

  The water-tightness test apparatus configured in this manner allows water in the test section T to flow into the test section T formed between the first plug 10 and the second plug 11 through the water pipe 14 from the water supply means. The exhaust pipe 19 is discharged from the tip of the projection 19c to the outside of the test section.

  Even if water is injected into the test section T and the water level becomes high, the tip of the protrusion 19c of the exhaust pipe 19 is located above the water level and reaches the upper end of the test section T due to the float 20 floating in the water. . For this reason, when water is filled in the test section T, air can be discharged out of the test section from the tip of the projecting portion 19c of the exhaust pipe 19 located at the upper end of the test section T.

  Furthermore, since the second vent pipe 13 is accommodated in the water conduit 14 in the first plug 10, the second vent pipe 13 is not entangled with the water conduit 14, and the first plug 10 is easily handled.

  Note that the exhaust pipe 19 of this embodiment is only required to have the projecting portion 19c and the float 20 disposed in the test section T, and to be able to exhaust the air in the test section T. The protrusion 19c and the float 20 may protrude toward the two plugs 11.

  Next, a watertight test method in a pipe line using the watertight test device of the present embodiment will be described with reference to FIGS.

  This water-tightness test is performed between the preceding pipe 1 and the succeeding pipe 2 in the existing pipe line constructed by sequentially inserting and joining the succeeding pipe 2 to the preceding pipe 1 such as an FRPM pipe using the pipe joint 3a. This is for confirming the water tightness of the joint 3.

  First, the second plug 11 before being inflated is installed in the leading pipe 1 from the manhole 21 of the pipe line. The second plug 11 is in a state in which the projecting portion 19c of the exhaust pipe 19 faces the joint portion 3 side, and one end portion having the valve 19a of the exhaust pipe 19 on the opposite side of the joint portion 3 side with respect to the second plug 11. Place.

  Subsequently, the first plug 10 before being inflated is disposed in the subsequent pipe 2. The first plug 10 is in a state in which the discharge port 14a of the water conduit 14 faces the joint 3 side. The first plug 10 and the second plug 11 may be connected by a chain or the like, and the second plug 11 and the first plug 10 may be arranged in the pipe line in a connected state.

  And the water supply tube 17 connected to the water supply vehicle P2 installed outside the pipe line is drawn into the pipe line from the manhole 21, and connected to the water pipe 14 connected to the first plug 10 through the branch pipe 14b.

  Further, the air supply tube 15 connected to the compressor C installed outside the pipe line is connected to the first vent pipe 12 and the second vent pipe 13 via the branch pipe 15a.

  In this way, as shown in FIG. 4A, the first plug 10 is arranged in the subsequent pipe 2 and the second plug 11 is arranged in the preceding pipe 1 across the joint portion 3 in the pipe line. .

  Subsequently, by operating the compressor C and operating the regulators 12a and 13a, air is supplied only to the second vent pipe 13, and only the second plug 11 is filled with air to inflate it. At this time, the operator confirms whether or not the second plug 11 is inflated on the one end side of the exhaust pipe 19 with respect to the second plug 11 and is securely in close contact with the inner wall surface of the preceding pipe 1 (FIG. 4 (b)).

  After confirming the close contact of the second plug 11 to the inner wall surface of the preceding pipe 1, the regulator 12 a is operated to supply air to the first vent pipe 12, and air is introduced into the first plug 10. 10 inflates. At this time, as in the case of the second plug 11, the other workers are able to ensure that the first plug 10 swells on the side opposite to the joint portion 3 side with respect to the first plug 10, so (See FIG. 4C).

  A test section T is formed between the first plug 10 and the second plug 11 in the pipe line by inflating the first plug 10 and the second plug 11 and bringing the first plug 10 and the second plug 11 into close contact with the inner wall surfaces of the subsequent pipe 2 and the preceding pipe 1. Form.

  After forming the test section T, water is injected from the water supply tube 17 through the water pipe 14 into the test section T from the discharge port 14a by the pump of the water supply vehicle P2. When water is injected into the test section T, the air in the test section T is discharged out of the test section T from the projecting portion 19 c through the exhaust pipe 19.

  At this time, as shown in FIG. 5A, in the test section T, when the water surface becomes higher than the lower end of the float 20 (see the two-dot chain line), the float 20 floats with water. By the float 20 that floats up, the tip of the projecting portion 19c of the exhaust pipe 19 is always located above the water surface, and the air above the water surface can be reliably discharged out of the test section T by the exhaust pipe 19.

  The exhaust pipe 19 in a state of reaching the upper end portion in the test section T by the float 20 until the air discharge from the test section T and the injection of water from the discharge port 14a are continued and the test section T is filled with water. The air is discharged from the tip of the protruding portion 19c.

  After filling the test section T with water, the valve 19a of the exhaust pipe 19 is closed to stop the air discharge in the test section T, and water is injected until the water pressure measured by the measuring instrument 18 reaches the initial water pressure in the watertight test. Continue. When the measured water pressure reaches the initial water pressure, the valve 17a of the water supply tube 17 is closed, and water injection into the test section T is stopped.

  After stopping the water injection, start the watertight test. The watertight test is performed by measuring the water pressure drop in the test section T within a predetermined time by the measuring device 18 with respect to the initial water pressure.

  In this watertight test method, the water supply vehicle P2 is applied as the water supply means. However, the water supply pump P1 may be applied based on the inner diameter of the pipeline, the position of the test section T in the pipeline, and the like.

  After the watertight test, the water supply tube 17 is removed from the branch pipe 14b, and water in the test section T is discharged through the water pipe 14 using the connection end of the branch pipe 14b with the water supply tube 17 as a discharge port. Thereafter, water is discharged until the water surface in the test section T is located in the vicinity of the discharge port 14a of the water pipe 14, the first vent pipe 12 and the second vent pipe 13 are removed from the branch pipe 15a, the first plug 10, Shrink the two plugs 11

  Water in the test section T flows out into the pipe line from between the contracting first plug 10 (second plug 11) and the succeeding pipe 2 (leading pipe 1). Thereafter, the first plug 10 and the second plug 11 are collected through the manhole 21 from the inside of the conduit.

  As described above, the water tightness test for confirming the water tightness of the joint portion 3 between the preceding pipe 1 and the succeeding pipe 2 in the existing pipe line is performed.

  In the watertight test method of this embodiment, air in the test section T is discharged from the tip of the projecting portion 19c of the exhaust pipe 19 to the outside of the test section T while injecting water into the test section T from the water supply vehicle P2 through the water pipe 14. Therefore, the pressure rise in the test section T can be prevented.

  In addition, due to the float 20 floating in the water, the tip of the projecting portion 19c of the exhaust pipe 19 is located above the water surface and reaches the upper end of the pipe. For this reason, the air in the test section T can be discharged through the exhaust pipe 19 until the test section T is filled with water.

  The water-tightness test method of this embodiment is for confirming the water-tightness of the joint 3 between the preceding pipe 1 and the succeeding pipe 2 in the existing pipe line, but the preceding pipe 1 or the succeeding pipe 2 itself. It is also possible to confirm the water tightness of the water.

  In this case, the first plug 10 and the second plug 11 which are a pair of plugs are arranged in the preceding tube 1 or the succeeding tube 2 at intervals in the tube axis direction, and then the water tightness test is performed according to the procedure described above. It can be performed.

DESCRIPTION OF SYMBOLS 1 Prior pipe 2 Subsequent pipe 3 Joint part 3a Pipe joint 10 First plug 10a Cylindrical main body 10b, 10c Cap part 11 Second plug 11a Cylindrical main body 11b, 11c Cap part 12 First vent pipe 12a Regulator 13 Second vent pipe 13a Regulator 14 water pipe 14a discharge port 14b branch pipe 15 air supply tube 15a branch pipe 16 water supply tube 16a valve 17 water supply tube 17a valve 18 measuring instrument 19 exhaust pipe 19a valve 19b joint 19c protrusion 20 float 21 manhole C compressor P1 water supply pump P2 water supply Car T Test section

Claims (3)

A pair of plugs that swell when air is introduced, a vent pipe connected to the pair of plugs, and a passage having a discharge port that penetrates the first plug and projects toward the second plug out of the pair of plugs. A water pipe, an air supply means for supplying air to the vent pipe, a water supply means for supplying water to the water pipe, and a measuring instrument for measuring the pressure in the test section formed between the pair of plugs. In the watertight test equipment,
An exhaust pipe that penetrates one of the pair of plugs and protrudes toward the other plug, and a float that floats on water that is fixed to the tip of the projecting portion of the exhaust pipe; Is a water-tightness test apparatus characterized in that the tip of the protruding part has a length that reaches the upper end part in the test section.   The water tightness testing device according to claim 1, wherein the vent pipe for sending air to the second plug passes through the water pipe of the first plug and is connected to the second plug from a discharge port. A water-tightness test method in a pipe line using the water-tightness testing device according to claim 1 or 2,
The pair of plugs are arranged in the pipe line at an interval in the pipe axis direction, air is introduced from the air supply means through the ventilation pipe to the pair of plugs, and the pair of plugs is inflated, so In close contact with the wall surface, while discharging the air in the test section through the exhaust pipe, water is injected into the test section from the water supply means through the water supply pipe, the water is filled in the test section, and the exhaust is discharged by the float. A water-tightness test method in which the tip of the protruding portion of the pipe is made to reach the upper end in the pipe, and the pressure in the test section is measured by the measuring instrument in that state.

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