JP2010210551A - Water leakage inspection system and water leakage inspection method of resin water supply line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water leakage inspection system of a resin water supply line which is totally simplified, prevents a pressure from being fluctuated within the water supply line during an inspection, and correctly conducts a water leakage inspection in a short time, and a water leakage inspection method. <P>SOLUTION: The water leakage inspection system of the resin water supply line inspects a leakage in the resin water supply line 1 after piping is constructed. The inspection system includes: a meter replacement pipe 26 with a valve which is coupled to a position at which a water meter is attached to the water supply line 1; a valve closure releasing section 27 for releasing the check valve 21 on the secondary side of the water meter provided in the meter replacement pipe 26 so as to cause the primary side and the secondary side to be communicated with each other; and a pressure measuring apparatus 28 coupled to the meter replacement pipe 26, and accurately detecting the pressure. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a water leakage inspection system for inspecting leakage of a resin water supply line in a building such as an apartment house, and in particular, a resin water supply line in which a resin pipe such as a crosslinked polyethylene pipe or a polybutene pipe is used as the water supply line. The present invention relates to a water leakage inspection system and a water leakage inspection method.

  Conventionally, for example, in apartment houses, after piping construction, water leakage inspection of a water supply line composed of a water supply pipe or a hot water supply pipe is performed for each door. This water leakage inspection is carried out in the water supply line from the meter unit to the demand equipment such as a water tap at the end of the line, and this water leakage inspection inspects the presence or absence of water leakage in the water supply line based on poor connection. In this case, in recent years, from the viewpoint of corrosion resistance, earthquake resistance, workability, and the like, resin pipes are often used as piping for water supply lines. When water leakage inspection is performed on a water supply line composed of a resin pipe, the resin pipe is flexible, so the pipe volume expands due to the expansion of the pipe due to the creep phenomenon with the passage of time after high pressure is applied to the pipe, As a result, a phenomenon occurs in which the enclosed pressure decreases. This phenomenon can make it difficult to distinguish whether the pressure drop generated in the tube is due to leakage or expansion of the tube.

  In addition, there is a so-called one-touch joint in which a resin O-ring is used as a sealing material for a joint portion of a resin pipe. When a high pressure is applied to the resin pipe in a short time, the leak may stop due to the self-sealing function by the O-ring when the outer surface of the pipe is damaged.

  In order to avoid these problems, for example, there is a pipe leakage inspection method disclosed in Patent Document 1. In the literature 1, air pressure or water pressure with an inspection pressure of about 0.3 MPa is injected into a pipe made of a resin pipe by a pressurizing device (pump), and the inspection portion of the pipe is deformed after injection of this air pressure or water pressure. A leak inspection method is disclosed in which, after waiting for about 5 minutes in order to keep constant, a pressure change in the pipe is measured over about 10 minutes to determine whether there is a leak. As described above, when the resin pipe is inspected for water leakage, it is generally inspected by applying a relatively low pressure.

JP 2007-278730 A

  However, the pipe leakage inspection method disclosed in Patent Document 1 has the following problems. That is, in this leak inspection method, an inspection pump for supplying air pressure or water pressure into the pipe is separately required, and the equipment is complicated. Also, in this case, it is necessary to prepare water separately as an inspection fluid, so it takes labor to transport the water, and on-site curing may be necessary to prevent the workplace from getting wet with water. It was.

  Further, in this leak inspection method, since a low-pressure fluid is sent into the pipe by the inspection pump from the start of the leak inspection, it takes a long time to fill the pipe with the fluid and make a determination. In addition, a pressure drop may occur due to a change in the pressure in the pipe due to a change in the water temperature or the temperature of the pipe, or a creep deformation of the pipe accompanying a long-time inspection, and an accurate leak inspection may not be performed. Furthermore, the final leakage check must be made by visual inspection. At this time, since the water supply device is attached, the joint portion of the pipe is inside the wall surface and cannot be visually checked.

  In actual piping, a check valve is connected to the downstream side of the meter unit and a check valve is connected to the upstream side of the water heater to prevent backflow. Even if leakage occurs on the secondary side, if the secondary pipe pressure is higher than the pressure (actuation pressure) at which the check valve or check valve is open, the valve is closed. As a result, the flow path is divided, and the primary side of the check valve or check valve cannot detect a leak.

  Also, at the time of filling before inspection, the terminal faucet is closed after opening and closing the terminal faucet and exhausting the residual air in the line, but the water hammer pressure generated at that time is the same as that of the check valve and check valve. It may be sealed between the faucets. In this case, similarly to the above, the check valve and the check valve are kept closed, and leakage could not be detected.

  The present invention has been developed as a result of intensive studies in view of the above-described circumstances, and the object of the present invention is to simplify the whole and prevent pressure fluctuations in the water supply line at the time of inspection in a short time. The object is to provide a water leakage inspection system and a water leakage inspection method for a resin water supply line capable of accurately performing a water leakage inspection.

  In order to achieve the above object, the invention according to claim 1 is an inspection system for inspecting leakage of a resin water supply line after piping construction, and this inspection system is a valve joined to a water meter mounting position of the water supply line. Attached to the meter substitution pipe, a meter substitution pipe, a valve closing release part for releasing the primary side and secondary side of the check valve on the secondary side of the water meter provided in the meter substitution pipe, and the meter substitution pipe A water leakage inspection system for a resin water supply line comprising a pressure measuring device capable of detecting pressure with high accuracy.

  The invention which concerns on Claim 2 is a water leak test | inspection system of the resin-made water supply line in which a pressure measuring device can detect the pressure of several mmAq-several dozen mmAq.

  According to a third aspect of the present invention, a check valve is provided in the water supply line, and the check valve has a release mechanism including a ball valve body that releases the primary side and the secondary side of the check valve in a communicating state. This is a water leak inspection system for the water supply line.

  The invention according to claim 4 is a water leakage inspection method for inspecting leakage of a resin water supply line after piping construction, wherein a meter substitute pipe with a valve is connected to a water meter mounting position of the water supply line, and a meter secondary With the check valve on the side released, tap water pressure is supplied to the water supply line to fill it up and hold the water-filled state for a specified period of time. With the measuring device joined, shut off the primary side of the meter substitution pipe through the valve on the meter substitution pipe, and connect the secondary water supply line to the communication state and measure the pressure for a predetermined time to leak the water supply line. This is a water leakage inspection method for a resin water supply line that measures the presence or absence of water.

  The invention which concerns on Claim 5 is a water leak test | inspection method of the resin-made water supply line in which a pressure measuring device can detect the pressure of several mmAq-several dozen mmAq.

  According to a sixth aspect of the present invention, a check valve is provided in the water supply line, and the check valve is made of a resin having a release mechanism including a ball valve body that releases the primary side and the secondary side of the check valve in a communicating state. This is a water leak inspection method for a water supply line.

  In the invention according to claim 7, the check valve is provided on the primary side of a demand device such as a water heater provided in the water supply line, and the ball spherical surface holds the check valve portion in an open state when the ball valve body is in a half-open state. This is a water leakage inspection method for a resin water supply line in which the check valve portion operates normally when the ball valve body is fully open.

  According to an eighth aspect of the present invention, the meter substitute pipe with a valve is configured such that the primary side and the secondary side of the check valve on the secondary side of the water meter are released to the communication state, fully opened at the time of filling, and primary at the time of measurement. This is a water leakage inspection method for a resin water supply line having a T-port three-way valve that shuts off the side and communicates the secondary side with the pressure sensor outlet.

  According to a ninth aspect of the present invention, there is provided a water leakage inspection method for a resin water supply line provided with a meter unit having a primary side support mechanism and a secondary side support mechanism having a check valve at a water meter mounting position. It is.

  According to the first aspect of the present invention, the primary side and the secondary side of the check valve can be communicated with each other, so that when the water leak occurs on the secondary side of the check valve during the water leakage test, the flow path is divided. There is no. Further, even when residual air in the line is discharged at the time of filling before inspection, the water hammer pressure is not sealed between the check valve and the end faucet. For this reason, it is possible to provide a leakage inspection system for a resin-made water supply line that can prevent a pressure fluctuation in the water supply line at the time of inspection and can accurately perform a water leakage inspection in a short time.

  According to the second aspect of the present invention, it is possible to measure from a slight change in pressure to a large change in pressure, and it is possible to accurately measure the pressure in the water supply line and perform a water leak test.

  According to the invention according to claim 3, since the whole water supply line can be secured in a communication state by the check valve, the occurrence of pressure fluctuation due to water hammer pressure or the like is prevented, and the water supply made of resin that can be accurately inspected for leakage in a stable state This is a line water leakage inspection system.

  According to the invention of claim 4, since a test fluid or a pressurizing device is not required, the entire meter is simplified, and a meter substitute tube for inspection is attached, and the meter substitute tube is used for simple and accurate in a short time. This is a water leakage inspection method for a resin water supply line that can perform a water leakage inspection. In this case, if water leakage occurs on the secondary side of the check valve during the water leakage test, the flow path will not be cut off. Since it is not sealed between the water faucets, the pressure fluctuation in the water supply line is prevented during the inspection, and the water leakage inspection can be performed in a stable state.

  According to the invention which concerns on Claim 5, it can measure from the change of a very small pressure to a big change of pressure, and it is a water leakage inspection method of the resin-made water supply line which can measure a pressure in a water supply line correctly, and can perform a water leakage inspection. is there.

  According to the invention which concerns on Claim 6, since the whole water supply line can be ensured in a communication state by the check valve, the occurrence of pressure fluctuations due to water hammer pressure etc. is prevented, and the water supply made of resin that can be accurately inspected for leakage in a stable state This is a water leak inspection method for the line.

  According to the invention of claim 7, at the time of water leakage inspection, the whole water supply line composed of the water supply pipe and the hot water supply pipe is connected to the water heater and the demand equipment, and the pressure is accurately measured while preventing the pressure fluctuation in the water supply line. On the other hand, it is a leakage inspection method for a resin water supply line that prevents back flow to the water meter side at normal times.

  According to the eighth aspect of the present invention, when the meter substitute pipe is connected to the water meter mounting position, the check valve is automatically released and the water leakage is accurately performed in a state where the flow path of the entire water supply line is secured. Can be inspected. In addition, it is a method for inspecting leaks in a resin water supply line that can directly measure the pressure in the water supply line at the time of filling, and can measure the pressure without being affected by the pressure on the primary side of the meter substitute pipe at the time of measurement. .

  According to the ninth aspect of the present invention, the meter substitute pipe can be easily connected using the support mechanism, and the meter substitute pipe can be connected without leakage to accurately detect the pressure. This is a water leak inspection method for a water supply line.

It is the schematic diagram which showed an example of the water leakage test | inspection system of the resin water pipe in this invention It is sectional drawing which showed the principal part of the water leak test | inspection system of the resin water supply pipe | tube in this invention. It is sectional drawing which showed the meter substitute tube and the pressure sensor. It is sectional drawing which shows the state which switched the flow path of the meter substitute pipe | tube of FIG. It is a partially cutaway enlarged sectional view showing a pressure sensor. It is a partially cutaway longitudinal sectional view showing a check valve with a ball valve body It is a cross-sectional view which shows the state which the ball valve body of the check valve with a ball valve body of FIG. 6 opened halfway. It is the schematic diagram which showed the state of the water supply line at the time of piping laying.

Hereinafter, embodiments of a water leakage inspection system and a water leakage inspection method for a resin water supply line according to the present invention will be described in detail with reference to the drawings.
In FIG. 1, the water leakage inspection system of the present invention is for inspecting leakage of a resin water supply line 1 after pipe construction. The water supply line 1 is, for example, a pipe branched from a water supply main (not shown) through a meter unit 2 to a door in an apartment house, etc., and a water supply pipe 1a shown by a solid line and a hot water supply pipe 1b shown by a one-dot chain line have. The water supply line 1 is connected to the secondary side of the meter unit 2 with demand equipment 3 such as a wash surface, a kitchen, a unit bath, a toilet faucet, and a washing machine. The water heater 3a is connected to the hot water supply pipe 1b so that the water in the water supply line 1 can be heated to supply hot water to the demanding equipment 3 such as a kitchen or a unit bath. The entire line can be filled by flowing water from the pipe 1a to the water heater 3a. In the water supply line 1, a pressure reducing valve 6 and a stop cock 7 are connected to the primary side of the meter unit 2 via an elbow 15 a of a primary side tubular member 15 described later.

  The meter unit 2 shown in FIG. 2 is provided, for example, at a water meter mounting position in a storage space called a pipe shaft (not shown) for attaching a water meter (not shown) to the water supply line 1. This meter unit 2 includes a base body 11 made of ductile cast iron and the like on which both holding parts 10 and 10 are erected, a primary side support mechanism 12 provided in each holding part 10 and 10, and a secondary side support. And a receiving mechanism 13.

  In the meter unit 2, the primary side support mechanism 12 includes a holding portion 10, a primary side cylindrical member 15, a slide member 16, and a rotating member 17. A primary cylindrical member 15 is fixed to the holding portion 10, and a slide member 16 is inserted into the primary cylindrical member 15. The slide member 16 is formed with an arcuate receiving surface 16a that supports a primary connection end of a water meter (not shown), and when the rotating member 17 screwed on the outer peripheral side is rotated. It can move forward and backward in the sliding direction. Further, a guide groove 16b extending in the advancing / retreating direction of the slide member 16 is formed at the lowermost portion of the receiving surface 16a, and a pin 11a protrudingly formed on the upper surface side of the base body 11 is engaged with the guide groove 16b. ing. As a result, the slide member 16 is slid by the rotation of the rotation member 17 while being prevented from rotating.

  On the other hand, the secondary side support mechanism 13 includes a holding portion 10, a secondary side cylindrical member 19, and a nut member 20. A secondary cylindrical member 19 is fixed to the holding portion 10, and a nut member 20 is screwed to the outer peripheral side of the secondary cylindrical member 19. The nut member 20 is formed with an arcuate receiving surface 20a that projects the secondary connection end of the water meter. Further, a check valve 21 is housed inside the secondary side support mechanism 13, and a release mechanism 52 described later is provided on the primary side of the water heater 3 a on the secondary side of the check valve 21. A check valve 22 having a ball valve body is provided.

  The check valve 21 has a valve body 23 and a spring 24 inside. The valve body 23 is normally urged toward the primary annular valve seat 25 by the elastic force of the spring 24 and is in a valve-closed state. For this reason, even when the pressure on the primary side becomes negative, the check valve 21 prevents the water on the secondary side from flowing back. The valve body 23 has a substantially hemispherical shape in which the vicinity of the axial center bulges to the primary side.

  Further, a meter substitute pipe 26 with a valve can be joined between the primary and secondary side support mechanisms 12, 13. Further, the meter substitute pipe 26 has a valve closing release portion 27 and a pressure measurement. A device 28 is provided. The water leakage inspection system includes a meter substitute pipe 26 attached to the water meter attachment position of the meter unit 2, a valve closing release portion 27, and a pressure measuring device 28.

  As shown in FIGS. 2 to 4, the meter substitute tube 26 has a main pipe portion 32 formed in the direction of the flow path, and a branch portion 33 branched from the main pipe portion 32 in a substantially vertical direction. ing. The main pipe part 32 has a primary side pipe part 32a and a secondary side pipe part 32b, and connection parts (male threads) 31, 31 for connecting to the meter unit 2 are provided in the respective pipe parts 32a, 32b. ing. Moreover, the branch part 33 is formed in order to measure a pressure. On the other hand, the valve closing release portion 27 is provided on the secondary side pipe portion 32b side of the main pipe portion 32, and has a protrusion structure that protrudes in the axial direction from the approximate center of the side portion of the main pipe portion 32. When the protrusion 27 presses the valve body 23 of the check valve 21, the check valve 21 is released to the open state.

  Further, a valve (three-way valve) 36 including a ball 35 having a T port 34 is provided in the meter substitute pipe 26. The ball 35 is mounted inside the three-way valve 36 via a pair of ball seats 37, 37 and is provided so as to be operable by an external handle (not shown). The three-way valve 36 rotates the ball 35 when filling the water supply line 1 to fully open the primary side pipe part 32a and the secondary side pipe part 32b in the main pipe part 32. When the pressure in the line 1 is measured, the primary side is shut off, and the secondary side and the pressure measuring port 38 which is a pressure outlet provided in the branch portion 33 are communicated.

In addition, a needle member 40 is mounted inside the branch portion 33 via a spring member 39. Normally, the needle member 40 is urged upward in the drawing by the resilience of the spring member 39 and the pressure of water filled in the meter substitute tube 26, and the needle member 40 is attached to the spring member 39. The ring 41 is tightly sealed to the seal valve seat 42 inside the branch portion 33. For this reason, the pressure measurement port 38 is normally closed.
In addition, as above-mentioned, although the meter substitute pipe | tube 26 of this embodiment is attached to the meter unit 2 which has the crimping | fixing fixation type support mechanisms 12 and 13 in the water meter attachment position, it is a screw fixed type which is not illustrated. A male screw 31 can be screwed onto the meter unit. Further, the pressure measurement port 38 is not necessarily formed in the branch portion 33, and may be formed in the main pipe portion 32.

The pressure measuring device 28 includes a pressure sensor 45 and a pressure recorder 46, and is joined to the meter substitute tube 26 so that the pressure can be detected with high accuracy. For example, the pressure measuring device 28 can detect a pressure of several mmAq to several tens mmAq.
In FIG. 5, the pressure sensor 45 has a sensor main body 47 and an adapter portion 48. The sensor main body 47 has a pressure receiving portion 49 that detects water pressure, and the pressure receiving portion 49 can detect a pressure of several mmAq to several tens mmAq with high sensitivity. The sensor main body 47 is integrally joined to the adapter portion 48 by screwing, and the adapter portion 48 is integrally attached to the branch portion 33 via the cap nut 50.

When the pressure sensor 45 is attached to the branch portion 33, the distal end side of the adapter portion 48 presses the needle member 40, and the needle member 40 moves downward against the elastic force of the spring member 39, and the O-ring 41. Is separated from the seal valve seat 42, and the pressure measurement port 38 and the pressure receiving portion 49 communicate with each other. Thereby, the inside of the pressure sensor 45 is filled with water, and the pressure sensor 45 is attached to the pressure measuring port 38 without air remaining.
The pressure recorder 46 is connected to the pressure sensor 45 and records the pressure fluctuation value detected by the pressure sensor 45.

  On the other hand, the check valve 22 shown in FIGS. 6 and 7 has a valve body 51, a ball valve body 52 for opening and closing, a check valve portion 53, and a spring 54, and of these ball valve bodies. A release mechanism consisting of 52 is provided. The release mechanism 52 can release the primary side and the secondary side of the check valve 22 into a communication state.

The valve body 51 of the check valve 22 includes a body 51a and a cap 51b, and is integrated by screwing the body 51a and the cap 51b. In addition to the above-described check valve portion 53 and the spring 54, a guide ring 57 and a backup ring 58 are mounted on the inner peripheral side of the cap 51b. The check valve portion 53 includes a substantially umbrella-shaped valve body portion 53a and a shaft portion 53b, and a spring 54 is mounted between the valve body portion 53a and a stepped portion 57a formed on the guide ring 57. In addition, the shaft 53b is mounted in a state of being inserted into a guide hole 57b formed in the guide ring 57. The check valve portion 53 and the guide ring 57 are mounted inside the backup ring 58 in this state, and the mounting cylinder 58a formed on the backup ring 58 is fitted into the fitting hole 51c on the inner peripheral side of the cap 51b. And fixed to the cap 51b.
With this structure, the check valve portion 53 is moved in the direction of the valve seat surface 58b of the backup ring 58 by the elastic force of the spring 54 as shown in FIG. 6 in a normal state, and is attached to the valve body portion 53a. The ring 59 seals closely with the valve seat surface 58b.

  A pair of ball seats 60, 60 are mounted on the front side of the backup ring 58 and the body 51 a, and a ball valve body 52 is disposed between the ball seats 60, 60. The ball valve body 52 is disposed in the valve body 51 while being sandwiched between the ball seats 60 and 60 when the body 51a and the cap 51b are integrated. A stem 62 is attached to the upper side of the ball valve body 52, and the ball valve body 52 is rotatable by operating a handle 64 attached to the stem 62.

  As shown in FIG. 7, in the check valve 22, the ball spherical surface 52 a of the ball valve body 52 contacts the check valve portion 53 when the release mechanism 52 is rotated in a half-open state, for example, about 45 degrees. Then, by the release mechanism 52, the check valve portion 53 is pressed in the valve opening direction against the spring force of the spring 54, so that the primary side and the secondary side of the check valve 22 are released to the communication state. The

At this time, since the ball valve body 61 has an intermediate opening, the primary side and the secondary side of the check valve 22 are always maintained at the same pressure.
On the other hand, when the ball valve body 52 is rotated to the fully open state, the ball spherical surface 52 a is separated from the check valve portion 53, and the check valve portion 53 is normally reversely operated by the spring 54.

In FIG. 2, the pressure reducing valve 6 is connected to an elbow 15 a by a union nut 65, and a strainer 66 is built in the pressure reducing valve 6.
Further, the stop cock 7 is connected to the primary side of the pressure reducing valve 6 via a union nut 67, and water supply to the meter unit 2 side can be stopped by the stop cock 7.

  In the water leakage inspection system of the present invention, the pressure is measured by switching the flow path of the meter substitute pipe 26 joined to the water meter mounting position, but the water stopcock 7 is closed without switching the meter substitute pipe 26. It is also possible to switch to the state and measure the pressure on the primary side of the stop cock 7 with the pressure measuring device 28 in this state. In this case, the three-way valve 36 inside the meter substitution pipe 26 can be omitted, and the primary side flow of the meter unit 2 can be provided by a normal substitution pipe without using a branching structure like the meter substitution pipe 26. It is also possible to connect the path and the secondary flow path. Furthermore, in any case, for example, an openable / closable branch path (not shown) is provided on the primary side slightly from the valve body 23 of the check valve 21, and the pressure measuring device 28 is joined to the branch path. A water leakage inspection of the water supply line 1 can also be carried out. When measuring the pressure by switching the stop cock 7 to the closed state, the pressure reducing structure of the pressure reducing valve 6 is preferably released.

Subsequently, a water leakage inspection method in the above water leakage inspection system will be described.
Here, the process of inspecting the water supply line 1 for leaks is roughly divided into leak inspection at the time of piping laying (construction intermediate process) and leak inspection after connection of demand equipment (final inspection process). The water leakage inspection method of the water leakage inspection system corresponds to the inspection of the final inspection process, and is for inspecting leakage of the water supply line 1 after piping construction. For the sake of explanation, first, after describing the leak inspection in the building intermediate process, the water leak inspection method in the final inspection process will be described.

  In the leak inspection in the middle of the construction process, when pipes to be concealed are installed, the end portion to which the demand equipment 3 of the water supply line 1 is connected is sealed with plug 70 or sealed with air or water. And the part connected to the water heater 3a of the water supply piping 1a and the hot water supply piping 1b is performed in the state short-circuited by the short-circuit tube 71. In this example, it is assumed that the leakage inspection in the building intermediate process is performed by air sealing. In this case, it is not necessary to prepare water, and a leak test can be easily performed. Since this leak inspection may be a commonly used inspection method, the details thereof are omitted.

  If it is confirmed that there is no abnormality in the piping in the leak inspection during the construction process, interior work such as walls and ceilings will be carried out while maintaining the pressure in the water supply line 1. The interior work is carried out while monitoring so that there is no leakage due to an accident or the like, and after confirming that the pressure in the water supply line 1 is maintained until the completion of the work, the plug 70 and the short-circuit pipe 71 are connected. The demand equipment 3 and the water heater 3a such as a faucet of a wash basin are connected to the end of the water supply line 1 after removal.

  After connection of the demand equipment 3 and the water heater 3a, the state shown in FIG. 1 is obtained, and a water leakage inspection in the final inspection step is performed in the state of the water supply line 1. That is, the water leakage inspection in the final inspection step is to inspect water leakage at the connection site of the demand equipment 3 and the water heater 3a using a one-touch joint for resin pipes or the like.

  When performing the water leakage inspection in the final inspection process, first, in FIG. 1, the meter substitute pipe 26 is connected to the water meter mounting position of the water supply line 1. At the time of this connection, both connection parts 31 and 31 of the main pipe part 32 of the meter substitute pipe 26 are placed on the receiving surfaces 16a and 20a of the primary and secondary side support mechanisms 12 and 13, respectively. The side support mechanisms 12 and 13 and the meter substitute main pipe portion 32 are arranged coaxially. At this time, the valve closing release portion 27 is separated from the valve body 23 of the check valve 21.

  From this state, the rotary member 17 of the primary side support mechanism 12 is rotated, and the slide member 16 is advanced to the meter substitute tube 26 side. As a result, the slide member 16 presses the meter substitute tube 26, the meter substitute tube 26 moves to the secondary side, and the protrusion 27 presses the valve body 23. By this pressing, the valve body 23 is released to the open state, and after the rotary member 17 is tightened, the flow path in the primary side support mechanisms 12 and 13 and the flow path in the meter substitute tube 26 communicate with each other. Due to this communication, a pressure change on the secondary side of the valve element 23 is also detected during pressure measurement by the pressure sensor 45, and a very small pressure change of about several mmAq to several tens mmAq is detected over the entire water supply line 1. Is possible.

On the other hand, as shown in FIG. 7, the ball valve body 52 of the check valve 22 provided on the primary side of the water heater 3a is rotated to be released. By opening the check valve portion 53 in this way, the water supply line 1 and the water heater 3a communicate with each other, and leakage including the water heater 3a can be detected.
At this time, since the valve body 23 of the check valve 21 is also released by the protrusion 27 as described above, the demand device 3 is opened and closed in this water filling process for removing air remaining in the water supply line 1. The water hammer pressure generated at this time is not sealed on the secondary side of the check valve 21.

  Next, the ball 35 of the three-way valve 36 is operated in the state shown in FIG. 3 to supply tap water pressure to a water supply line 1 from a water pipe (not shown) provided in a building such as a public water pipe or an apartment house. To do. This water filling is performed by using a water supply pressure of about 0.2 to 0.3 MPa without using an inspection pump so that air does not remain in the water supply line 1 and in the demanding equipment 3 and the water heater 3a. Drain and drain water while sufficiently venting air. At this time, even when the pressure reducing valve 6 is installed as in the present embodiment, water is charged through the pressure reducing valve 6 at the above-mentioned water supply pressure.

  After filling with water, this state of filling is maintained for a predetermined period. In the present embodiment, the stop cock 7 and the three-way valve 36 are left open for at least one day to stabilize the creep deformation of the pipes constituting the water supply line and the temperature of the pipes and fluid (water). Minimize bubbles generated by water supply and temperature changes. In the case of apartment houses such as apartments, a water leak inspection is performed for each floor, and at the time of the inspection, dwelling units on the same floor are similarly filled with water and prepared.

  After a predetermined period of time, the pressure sensor 45 is connected to the meter substitute tube 26. When connecting the pressure sensor 45, the cap nut 50 is screwed onto the meter substitute tube 26 while filling the pressure receiving portion 49 with water as described above and discharging air together with water so as not to entrain the air. Connect. Subsequently, a signal line (not shown) of the pressure sensor 45 is connected to the pressure recorder 46. As described above, the pressure measuring device 28 including the pressure sensor 45 and the pressure recorder 46 is joined to the meter substitute tube 26.

Note that the meter substitution pipe 26 can also be subjected to the above-described leakage inspection with air in the building intermediate process with the pressure sensor 45 attached. In this case, the meter unit 2 is attached to the water supply line 1 before the leakage inspection, and the meter substitute pipe 26 is joined to the meter unit 2 in the same manner as in the final inspection step.
In addition to the connection by the cap nut 50, the meter substitute tube 26 and the pressure sensor 45 can be connected by, for example, a joint structure that can be attached and detached with one touch. In this case, the meter substitute tube and the pressure sensor can be easily attached and detached, and the time required for preparation for the water leakage test can be shortened.

  Next, the ball 35 of the three-way valve 36 is operated to close the valve in the state shown in FIG. 4, and the water supply pressure on the primary side of the meter substitution pipe 26 is cut off via the three-way valve 36. The secondary water supply line 1 is connected to the branch portion 33 to measure the pressure signal for a predetermined time. As a result, the pressure signal can be recorded without being affected by the pressure supply from the pressure reducing valve 6 side. In this embodiment, the measurement time of the pressure signal is 10 minutes. At this time, even if the leak is about one drop of water, the leak is detected and recorded as a pressure drop of several mmAq in the water supply line 1 by the pressure measuring device 28. And when a pressure drop is not observed, it determines with "no leak" of the water supply line 1, and makes it pass. On the other hand, when the measured pressure drop is larger than the preset allowable pressure drop from the volume of the water supply line 1 pipe to be inspected and the allowable leak quantity, it is determined that there is a leak.

When the water leakage inspection by the pressure measurement is finished, the meter substitute pipe 26 is removed from the meter unit 2 after draining from the water supply line 1 through the meter substitute pipe 26. The meter substitute tube 26 can be easily removed by rotating the rotating member 17 in the direction opposite to that when the rotating member 17 is mounted and retracting the slide member 16. At this time, the check valve 21 returns to the normal check operation state by automatically returning the valve body 23 by the resilient force of the spring 24.
On the other hand, on the water heater 3a side, by rotating the ball valve body 52 to the fully open state, the check valve portion 53 is automatically restored by the spring force of the spring 54, and the check valve 22 is operated normally. It is supposed to return to the state.

Next, the effect | action in the said embodiment of the water leak test | inspection system and the water leak test | inspection method of the resin water supply line of this invention is demonstrated.
In the water leakage inspection system of the present invention, the meter substitute pipe with valve 26 is joined to the meter unit 2 which is the water meter mounting position, and the pressure substitute device 26 is provided in the meter substitute pipe 26, so that the tap water pressure is supplied through the water supply line 1. Supply pressure and measure pressure. This eliminates the need for separate inspection pumps and eliminates the need for inspection water and curing during inspections, thus reducing the inspection time per unit using a simplified facility. Can be implemented.

  Moreover, by supplying the tap water pressure as described above, the meter substitute pipe 26 is joined to each door in advance before the pressure measurement, and then the water supply line 1 is filled with water and preparations such as air venting can be performed. Accordingly, it is possible to sequentially inspect each door in the same floor of a condominium or the like using one set of pressure measuring device 28 and finish the inspection of one floor in a short time.

  At the time of pressure measurement, the pressure in the water supply line 1 that has been in a stable state after a predetermined time has been switched to the pressure sensor 45 side by the meter substitute pipe 26, so that an accurate pressure can be measured by the pressure sensor 45. . Since the pressure can be measured in a short time of about 10 minutes, it is difficult for pressure change due to the temperature and the radius of the water temperature to occur, and the creep of the resin pipe constituting the water supply line 1 is inspected by the low-pressure supply pressure. Water leakage inspection can be performed accurately without being affected by deformation.

  Moreover, since the valve closing release portion 27 is provided in the meter substitute pipe 26 and the check valve 22 is provided on the primary side of the water heater 3a, the water supply pipe 1a and the hot water supply pipe 1b are opened to ensure the entire water supply line 1 is in communication. It is possible to prevent the flow path of the water supply line 1 from being cut off and the water hammer pressure at the time of filling before inspection from being enclosed in the water supply line 1. Thereby, the exact leak test | inspection of the whole water supply line 1 can be implemented by one measurement.

Next, an embodiment of the water leakage inspection system for a resin water supply line and the water leakage inspection method according to the present invention will be described.
In the water leakage inspection method for the resin water supply line described above, an example of determination of the allowable pressure drop was set as follows.
The target for water leakage inspection was as follows.
Volume of water supply line to be inspected:
Water supply side main pipe Nominal diameter 16A If length is 3m, 0.8 × 0.8 × π × 300 ≒ 603cc
Water faucet side water supply pipe Nominal diameter 13A If length is 30m, 0.65 × 0.65 × π × 3000 ≒ 3980cc
Hot water supply side main piping Nominal diameter 16A If length is 3m, 0.8 × 0.8 × π × 300 ≒ 603cc
Water faucet side hot water pipe Nominal diameter 13A If length is 20m, 0.65 × 0.65 × π × 2000 ≒ 2653cc
Capacity of mixing tap for bus: 200cc
Water heater capacity: 500cc
As a pressure measuring device, Hajime Co., Ltd.'s “Big Surprise 2 HWR-501” (or Surprise 3 HWR-701) was used.
Under the above conditions, the volume of demand equipment such as a single water tap is considered to be included in the above pipe volume for simplification, and the total volume of the pipe to be inspected is 603 + 3980 + 603 + 2653 + 200 + 500 = 8539 cc.
If the leakage amount is allowed up to a water droplet having a diameter of 2 mm, the volume k of the 2 mm water droplet is π × 0.1 ³ × 4/3 = 0.422 cc.
Assuming that the volume elastic modulus of water at 20 ° C. and 1 atm is 2.06 × 10 ⁹ Pa and the pipe is rigid,
From 1 / k = 1 / V · dv / dp,
dp = 0.0042 / 8539 ・ 2.06 × 10 ⁹ Pa
= 0.00101 MPa
~ 10cmAq
That is, under this condition, it is determined that the pressure drop of 10 cmAq or more is rejected, and if it is less than that, it is determined to be pass. At this time, “a pressure drop of 10 cmAq or more” is merely an example of a pass / fail criterion, and this value is not concerned. For example, under the above conditions, the criterion is preferably 6 cmAq or more, and in this case, the criterion becomes stricter.

DESCRIPTION OF SYMBOLS 1 Water supply line 2 Meter unit 3 Demand equipment 3a Water heater 12 Primary side support mechanism 13 Secondary side support mechanism 21 Check valve 22 Check valve 26 Meter substitute pipe 27 Protrusion part (valve closing release part)
28 Pressure measuring device 34 T port 36 Three-way valve 38 Pressure measuring port 52 Ball disc (release mechanism)
52a Ball spherical surface 53 Check valve

Claims (9)

  An inspection system for inspecting leakage of a resin water supply line after piping construction, the inspection system being provided in a meter substitute pipe with a valve joined to a water meter mounting position of the water supply line, and the meter substitute pipe A valve closing release part for releasing the primary side and the secondary side of the check valve on the secondary side of the water meter into a communicating state, and a pressure measuring device capable of detecting the pressure with high accuracy by joining the meter substitute pipe A water leakage inspection system for a plastic water supply line.   The water pressure inspection system for a resin water supply line according to claim 1, wherein the pressure measuring device is capable of detecting a pressure of several mmAq to several tens mmAq.   The check valve according to claim 1 or 2, wherein a check valve is provided in the water supply line, and the check valve includes a release mechanism including a ball valve body that releases the primary side and the secondary side of the check valve in a communicating state. Water leakage inspection system for plastic water supply lines.   A water leakage inspection method for inspecting leakage of resin water supply lines after pipe construction, connecting a meter substitute pipe with a valve to the water meter mounting position of the water supply line, and releasing the check valve on the secondary side of the meter In such a state, tap water pressure is supplied to the water supply line so that the water supply state is maintained for a predetermined period of time, and then a pressure measuring device capable of detecting pressure with high accuracy is joined to the valve-equipped meter substitute tube. In this state, shut off the primary side of the meter substitution pipe through the valve of the meter substitution pipe, and measure the presence or absence of leakage in the water supply line by measuring the pressure for a predetermined time with the secondary side water supply line in communication. A water leakage inspection method for a resin water supply line, characterized in that   The water pressure inspection method for a resin water supply line according to claim 4, wherein the pressure measuring device is capable of detecting a pressure of several mmAq to several tens mmAq.   6. The check valve according to claim 4, wherein a check valve is provided in the water supply line, and the check valve includes a release mechanism including a ball valve body that releases the primary side and the secondary side of the check valve in a communication state. Water leakage inspection method for resin water supply lines.   The check valve is provided on a primary side of a demand device such as a water heater provided in a water supply line, and the ball spherical surface holds a check valve portion in an open state in a half-open state of the ball valve body. The water leakage inspection method for a resin water supply line according to claim 6, wherein the check valve portion operates normally in the fully open state.   The valve-equipped meter substitute pipe has a protruding structure that releases the primary side and secondary side of the check valve on the secondary side of the water meter in a communicating state, fully opened when the water is filled, and shuts off the primary side when measuring, The method for inspecting leakage of a resin water supply line according to any one of claims 3 to 7, further comprising a T-port three-way valve that communicates the side and the pressure sensor outlet.   The resin unit according to any one of claims 4 to 8, wherein a meter unit including a primary side support mechanism and a secondary side support mechanism having a check valve is provided at the water meter mounting position. Water leakage inspection method for water supply lines.

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