JPH0755625A - Device for probing leak from fluid conduit pipe and method for probing locating of leak - Google Patents

Abstract

PURPOSE:To surely and easily locate leaks even with a small leakage by supplying air to a fluid conduit pipe, either solely or together with another fluid to be mixed therewith. CONSTITUTION:A device for probing leaks from a fluid conduit pipe comprises an inflow portion 20 having a flowmeter 22 and a valve 24 connected to each other via a check valve 23 and both connected to the supply side of an existing, parted fluid conduit pipe 1; an outflow portion 30 connected to the inflow portion 20 via a valve 32 and to the outflow side of the existing parted fluid conduit pipe 1; an air injecting portion 40 connected to a compressor 46 via a valve 42; a pressure gauge 60 disposed between the inflow portion 20 and the outflow portion 30; and an exhaust portion 50. Compressed air supplied from the air supply portion 40 is blown into the existing fluid conduit pipe 1 from the outflow portion 30, either solely or together with another fluid to be mixed therewith, so as to probe the locations of leaks by the sound of the mixed fluids flowing out therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for investigating a leak point suitable for finding a leak point of tap water, gas or sewage generated in a fluid conduit such as a water pipe, a gas pipe or a sewer pipe, and a survey thereof. Regarding the method.

[0002]

2. Description of the Related Art It is extremely difficult to find water leaks from water pipes buried underground or in walls, etc., and valuable water resources are leaked in large amounts during the discovery, or users use large amounts of money. There is a case where a heavy load is imposed and a serious accident may occur due to the outflow of sediment due to water leakage. Therefore, it is necessary to detect the leaked area early and surely and to repair it properly before it becomes important.

As a method of finding water leakage, an acoustic detector is generally used, and a direct capturing method of directly capturing the leakage sound by the acoustic detector or an indirect method of analyzing the captured sound to assume a leakage location. It has been known. Further, as the sound detecting device, there is also provided a device provided with a high-sensitivity pickup device that captures a minute water leak sound, a monitor system that faithfully reproduces the captured water leak sound, and the like. Further, due to recent advances in electronic technology, a device has been proposed in which radio waves or the like are sent bidirectionally to a water pipe, and the location of water leakage is determined based on the difference in echo radio waves using the principle of the so-called Doppler effect.

[0004]

However, the direct detection method of the direct water leak sound by the sound detector is a method of extracting a very small water leak sound from various captured sounds and determining the water leak location. However, it requires a lot of experience and skill of a skilled engineer, is greatly affected by surrounding environmental conditions, and cannot be adopted when a structure or the like exists in the middle of the pipeline. Further, the above-described sound detector or radio wave leak detector having the high sensitivity characteristic is extremely expensive and is not only large in size, it is also necessary to capture an extremely small amount of leak sound generated in a residential area. It is almost impossible to deal with this because there is a difference in sound propagation due to material characteristics. For example, a non-metal pipe such as a vinyl pipe and a metal pipe have greatly different sound propagation rates, and even if water leaks under the same conditions, the characteristics of the leaked sound captured are completely different.

Furthermore, the trapping characteristic of the water leakage sound greatly changes depending on whether the situation on the ground where the water pipe is buried is soil or concrete. Further, when there is a groundwater vein or a leak is accumulated at the buried location of the water pipe, the leak sound is mixed with these water sounds, and there is a problem that the sound cannot be captured.

[0006] Further, in a city, there are various sound sources, and a sound detector having a high sensitivity characteristic sensitively captures these ambient sounds, so that a leak sound from a water pipe is important. There are also problems peculiar to cities, such as being difficult to capture. Especially, when the water pipe is buried under the road surface where the road surface material with high sound conductivity such as tiles is used for molding, it is more difficult to capture the leakage sound due to the influence of the road surface material. Has become.

On the other hand, when air is mixed in the water pipe,
The water that comes out of the faucet becomes cloudy, and if the air is not vented well when passing water, there is a problem that the water pressure does not come out even if the faucet is twisted due to the air pressure accumulated in the pipe. Further, when water and air are mixed, there is a case where a so-called water hammer phenomenon occurs in which the water and the air are alternately and vigorously ejected with loud noise and vibration when the outlet (faucet) is opened.

Due to various inconveniences caused by the air mixed in the water pipe, it is extremely important to take measures against the air mixed in the water pipe in the water supply business. In other words, measures to remove air from the water pipe are extremely important, and there is no idea of using air.
Incidentally, the above-mentioned problems of water leak of water pipes or mixture of air are common problems in, for example, water leaks of sewer pipes, gas leaks from gas pipes or leaks from various fluid pipes, transport devices using fluids, etc. But also.

As described above, in the water supply business, although air is a so-called irrelevant air, the inventors of the present invention have paid attention to the flow characteristics of air in the water pipe, and have investigated water leakage, which has been very difficult to find in the past. The present invention has been completed through extensive studies on utilization as means and through trial and error. For example, when compressed air is supplied into a water pipe, when this compressed air reaches a water leakage point, the amount of air leaked is 3 to 8 at a stretch.
It reaches up to 5 times. In addition, the state of the supplied compressed air in the water pipe does not flow in a state where the water pipe is filled, but at first, it flows while forming certain bubbles. The compressed air has a flow characteristic that, for example, in the rising pipe portion and the curved portion, it flows while being replaced with water remaining in the pipe.

Due to the flow characteristics of the compressed air in the water pipe, from each faucet provided in the water pipe, sounds such as bubbles bursting are sequentially heard from the faucet on the inflow side,
The sound pressure is also extremely high. On the other hand, the sound quality of the water leak sound at the water leak location is somewhat different depending on the amount of water leak or the underground condition, but as mentioned above, the only burst noise that the mixture of air and water flows out is water. It is completely different from the outflow sound, and is clearly distinguished, and the difference in sound pressure is also extremely large. Therefore, when there is a groundwater flow in the buried portion of the water pipe or a leak is accumulated, it is heard as an outflow sound with a sound quality that does not occur due to the leak of tap water.

Therefore, in view of the above-mentioned flow characteristics of the gas in the pipe, the present invention has made it possible to reliably and easily find out even if a very small amount of fluid leaks from the fluid conduit. The present invention has been proposed for the purpose of providing a fluid conduit leak investigation device and a fluid conduit leak location investigation method.

[0012]

A fluid conduit leak investigation apparatus according to the present invention, which has achieved this object, comprises an inflow section connected to the main side of an existing fluid conduit, which is provided with an inflow valve and is divided,
An outflow part connected to this inflow part and an outflow valve and connected to the terminal side of the existing fluid conduit that is divided, and one end side is connected between the inflow part and the outflow part and the other end side is a gas valve. It is composed of a gas supply unit connected to the compressor via the gas supply unit.

Further, in the fluid conduit leakage checking device according to the present invention, a check valve is provided at the inflow portion, the check valve being located between the inflow valve and the connection portion of the existing fluid conduit connected to the main pipe side. And configure. Further, an exhaust unit provided with an exhaust valve is provided between the inflow unit and the outflow unit.

Further, in the fluid conduit leak investigation apparatus according to the present invention, a pressure gauge for measuring the pressure of the gas supplied from the gas supply section is arranged between the inflow section and the outflow section. Furthermore, by connecting the inflow part to the main pipe side and the outflow part to the terminal side of the meter box that measures the flow rate of the fluid installed in the existing fluid conduit, it is possible to bypass the meter box. Make a connection. Furthermore, at least a part or all of the conduit connecting the outflow portion and the outflow side of the existing fluid conduit is transparent or semitransparent.

Further, in the method for investigating a leak location of a fluid conduit according to the present invention, an inflow portion is equipped with an inflow valve and is connected to the main side of a divided existing fluid conduit, and the inflow portion and the outflow valve are connected. And an outflow part connected to the terminal side of the existing fluid conduit that is divided, and a gas supply part whose one end side is connected between the inflow part and the outflow part and the other end side is connected to the compressor via a gas valve. A fluid conduit leak detection device is used. Then, in a state in which all the discharge valves arranged in the existing fluid conduit are closed, the inflow valve at the inflow portion and the outflow valve at the outflow portion are opened to allow the fluid to flow into the existing fluid conduit and An operation is performed to fill the inside of the conduit. In this full state, the inflow valve of the inflow section is closed and the gas valve of the gas supply section is opened to supply the gas into the existing fluid conduit via the outflow section. Then, the leaked sound of the mixed fluid of the gas and the fluid flowing out from the leaked point is heard to identify the leaked point.

Further, in the method for investigating a leak location of a fluid conduit according to the present invention, an inflow portion is provided with an inflow valve and is connected to the main side of a divided existing fluid conduit, and the inflow portion and the outflow valve are connected. And an outflow part connected to the terminal side of the existing fluid conduit that is divided, and a gas supply part whose one end side is connected between the inflow part and the outflow part and the other end side is connected to the compressor via a gas valve. A fluid conduit leak detection device is used. Then, in a state in which all the discharge valves arranged in the existing fluid conduit are closed, the inflow valve at the inflow portion and the outflow valve at the outflow portion are opened to allow the fluid to flow into the existing fluid conduit and An operation is performed to fill the inside of the conduit. In this full state, the inflow valve of the inflow section is closed and the gas valve of the gas supply section is opened to supply the gas into the existing fluid conduit via the outflow section.
After that, by sequentially opening and closing the discharge valve provided in the existing fluid conduit, the presence or absence of gas outflow is confirmed, and the first discharge valve through which only the fluid flows out and this first discharge valve. It is determined that there is a leak point in the region between the discharge valve immediately before the discharge valve and the mixed fluid of gas flowing out. Further, the leak location is determined by listening to the leak sound of the mixed fluid of the gas and the fluid flowing out in the section where the presence of the leak location area is determined in this way.

Furthermore, in the method for investigating a leak location of a fluid conduit according to the present invention, an inflow portion connected to the main side of an existing fluid conduit which is equipped with an inflow valve and is divided, and an inflow portion and an outflow valve are connected. A gas supply part connected to the terminal side of the existing fluid conduit that is divided and separated, and one end side connected between the inflow part and the outflow part and the other end side connected to the compressor via a gas valve. A fluid conduit leak checking device comprising: Then, in a state in which all the discharge valves arranged in the existing fluid conduit are closed, the inflow valve at the inflow portion and the outflow valve at the outflow portion are opened to allow the fluid to flow into the existing fluid conduit and An operation is performed to fill the inside of the conduit.
In this full state, the inflow valve of the inflow section is closed and the gas valve of the gas supply section is opened to supply the gas into the existing fluid conduit via the outflow section. After that, open any discharge valve installed in the existing fluid conduit to check whether it is a fluid or a gas, and if the discharge valve is a discharge valve for gas, immediately close it, and In the case of the discharge valve that flows out, the outflow amount of the fluid until the gas or the mixed fluid of the fluid and the gas flows out is measured. Then, by dividing this outflow amount by the cross-sectional area of the pipe diameter of the existing fluid conduit, the distance from the discharge valve is calculated, and the leak location is determined.

Furthermore, in the method for investigating the leak location of the fluid conduit according to the present invention, the piping position of the unidentified existing fluid conduit is preliminarily investigated by listening to the outflow sound of the gas supplied into the existing fluid conduit which is full. In addition, the existing fluid conduit is a water pipe, and the gas supplied from the gas supply unit to this water pipe is air.

[0019]

According to the fluid conduit leak investigation apparatus of the present invention constructed as described above, the inflow portion is connected to the main pipe side of the existing fluid conduit which is divided with the water stop plug closed. At the same time, the outflow portion is connected to the terminal side. With the inflow valve and the discharge valve held open, the water stopcock is opened to allow the fluid to flow into the existing fluid conduit to fill the existing fluid conduit. After closing the water stop valve and the inflow valve, the compressor is driven to supply the compressed gas from the gas supply section through the outflow section into the existing fluid conduit.

Further, according to the fluid conduit leak investigation apparatus of the present invention, the existing fluid conduit divided with the water stop plug closed has an inlet part connected to the main pipe side and a terminal side. The outflow part is connected to. With the inflow valve and the discharge valve held open, the water stopcock is opened to allow the fluid to flow into the existing fluid conduit to fill the existing fluid conduit. By driving the compressor, the compressed gas is supplied from the gas supply unit to the outflow unit, and the mixed fluid of the gas and the fluid is supplied to the existing fluid conduit.

Further, according to the fluid conduit leak investigation apparatus of the present invention, the check valve provided in the inflow portion is
It prevents backflow of air or mixed fluid to the main side of the existing fluid conduit to which the inflow part is connected. In addition, the exhaust valve installed between the inflow part and the outflow part can discharge the air or the mixed fluid in the leak inspection device, enabling continuous inspection without extracting the fluid or the mixed fluid in the existing fluid conduit. And Further, the pressure gauge disposed between the inflow part and the outflow part manages the pressure of the gas supplied to the existing fluid conduit to be equal to or lower than the fluid pressure of the existing fluid conduit, thereby causing a rupture of the existing fluid conduit in the leakage investigation. It is possible to prevent the occurrence of secondary disasters.

Furthermore, according to the fluid conduit leak investigation apparatus of the present invention, the flow meter of the meter box is connected in a detoured manner to prevent erroneous metering, for example, during a water leakage investigation, and to prevent the user from doing so. Avoid the burden. In addition, the connection conduit partly transparent or anti-transparent makes it possible to visually confirm the supply state of the gas supplied from the gas supply unit to the outflow unit, so that the supplied air can reach the leakage location. Make the identification visible.

According to the method for investigating a leak location in a fluid conduit according to the present invention for investigating a leak in a fluid conduit by using the leak investigating apparatus having the above-described structure, gas or a mixed fluid of gas and fluid is used as an existing fluid conduit. When it is supplied to the inside, the gas and the fluid of the mixed fluid alternately make a loud noise and flow out from the leakage portion by a so-called water hammer phenomenon. Therefore, it is possible to easily capture the large leak sound of the mixed fluid in place of the leak sound of the minute fluid by the acoustic detector, and it is possible to find the leak portion by the so-called acoustic method.

Further, according to the method for investigating the leak location of the fluid conduit according to the present invention, the gas supplied to the existing fluid conduit replaces the fluid and flows out from the leak location, so that the gas flows to the tip of the leak location. It takes advantage of the flow characteristics of gas in a fluid conduit. Therefore, it is possible to assume that there is a leak location between the exhaust valve without gas outflow and the exhaust valve immediately before it, among the sequentially opened exhaust valves. Is possible. For this reason, listening to a large leaked sound of a mixed fluid by an audiophonic method using an audiometric detector is
It may be carried out in a very limited area, and the survey time can be shortened.

Further, according to the method for investigating the leak location of the fluid conduit according to the present invention, it is confirmed whether any of the fluid or the gas flows out by sequentially opening the discharge valve provided in the existing fluid conduit, In the case of a discharge valve where the fluid flows out, by measuring the flowing-out fluid until the gas or a mixed fluid of gas and fluid flows out, and by slowing this flowing-out amount by the pipe cross-sectional area of the existing fluid conduit. Calculate the distance from the discharge valve to the leak point. Therefore, when the pipe state of the existing fluid conduit is confirmed by this water quantity calculation method, the location of the water leakage can be easily identified.

[0026]

EXAMPLES Specific examples of the present invention will be described in detail below. The embodiment is a water pipe 1 which is an existing fluid conduit.
2 shows a water leakage investigation device 10 of
As shown in FIG. 1, a meter box 2 installed in the house
The water meter 4 is replaced by the water meter 4 and is used by inserting and connecting the water pipe 1 and the house inside pipe 7, and a device for investigating a leak point existing between the meter box 2 and each faucet (not shown) is used. Served as. Leakage investigation device 10
It has a sealed so-called attache case type appearance and is easily carried by the handle 10A.

Prior to explaining the specific configuration of the above-described water leakage inspection apparatus 10, the basic principle of the present invention will be described. The in-home pipe 7 is connected to the water pipe 1 via the meter box 2 to receive the supply of tap water, and is connected with a large number of faucets and valves. Tap water is always discharged by twisting these faucets or opening the valve. Therefore, in the inside pipe 7
The tap water is always full. Even if tap water leaks from a part of the inside pipe 7 and tap water leaks, the tap water is continuously supplied from the pipe 1 to the inside pipe 7, and the full water state does not change. .

By the way, when air is supplied into the inside pipe 7 filled with water, this air exists independently of tap water, and air having a specific gravity smaller than that of water is, for example, inside pipe 7 provided with a faucet. Enter the rising part of the building and gradually replace it with tap water. Further, when there is a water leakage point in a part of the house inside pipe 7, the supplied air leaks from this water leakage point instead of tap water and does not enter the tip side. Therefore, when the faucet on the tip side is twisted from the water leakage point, tap water flows out from this faucet for a while. In addition, when the faucet on the front side of the leaked place is twisted, tap water in the faucet part replaces air,
From this faucet, air or a mixed water of air and tap water flows out.

As described above, when air is mixed in the water pipe and these alternately flow out, the so-called water hammer phenomenon is extremely effective as compared with the case where air or tap water flows out alone. A loud outflow noise is generated. The present invention skillfully utilizes the physical characteristics of air and water having different specific gravities to detect water leakage. In addition, the method of finding a leak location using the leak inspection apparatus 10 is also a method of listening to hear a leak sound, an area limitation method of limiting a leak area from the state of tap water or air flowing from an open faucet, or a leak from a faucet. There is a water amount calculation method for calculating the leakage location from the amount of water used, and a method combining these methods.

As shown in FIGS. 1 and 2, the water leakage inspection apparatus 10 has an inflow section 20 provided in each case 11.
And an outflow section 30, an air supply section 40, and an exhaust section 50 and a pressure gauge 60 branched and connected between the inflow section 20 and the outflow section 30, and the air supply section 4 as an auxiliary device.
A compressor 46 connected to 0 is used. The inflow part 20, the outflow part 30, the air supply part 40, and the exhaust part 5
0s are connected to each other by conduits 12 and can be independently operated by operating respective valves described later.

The inflow section 20 is connected to a flowmeter 22, a backflow prevention valve 23, and an inflow valve 24 arranged between the conduit 12 and an inflow section conduit 21 having one end communicating with the conduit 12. In addition, the other end of the inlet conduit 21 is provided with a transparent pipe 26 through a one-touch coupling 25.
Connected with. The flow meter 22 is a meter that detects the presence or absence of a water flow in a state where the inflow section 20 and the main pipe side of the water pipe 1 are connected by a method described later and a water supply operation is performed, and its structure is a so-called water meter. It has the same configuration as. Therefore, at the time of water leakage investigation described later, the inflow part 2
By connecting 0 to the terminal side of the water meter, it is possible to confirm the inflow amount of the tap water into the water leakage inspection device 10 by this water meter, and the flow meter 22 can be deleted.

The backflow prevention valve 23 is a valve for preventing the compressed air supplied from the air supply unit 40 from flowing back to the water pipe 1 side. The backflow prevention valve 23 sets the pressure of the supplied air to be equal to or lower than the water pressure of the water pipe 1 in the operation of the air supply unit 40, which will be described later, but is safe when accidentally supplying high-pressure air. Prepared for countermeasures.

Further, as shown in FIG. 2, the inflow valve 24 opens and closes the inflow conduit 21 by rotating an operating portion 24A provided on the housing 11 so as to communicate with the above-mentioned components. The function of controlling the opening and closing of the state and controlling the supply and interruption of tap water from the water pipe 1 is achieved.
In addition, the transparent pipe 2 connected to one end of the inflow conduit 21
Reference numeral 6 allows the state of tap water flowing from the water pipe 1 into the apparatus to be seen through from the outside. The inflow condition of the tap water is also monitored by the flow meter 22, and therefore the pipe 2
6 does not have to be transparent.

The outflow portion 30 is connected to the inflow portion 2 via the conduit 12.
0 in series with each other, and the outlet conduit 31 and the conduit 1
2 and an outflow valve 32 that controls the state of communication with 2. The outflow part conduit 31 of the outflow part 30 has one end connected to the conduit 12 and the other end connected to the transparent pipe 34 via the one-touch coupling 33. The transparent pipe 34 allows the supply state of water or compressed air to be supplied from the inside of the device to the inside pipe 7 to be visually recognized from the outside. As shown in FIG. 2, the outflow valve 32 opens and closes the outflow conduit 31 by rotating the operating portion 32A protruding from the housing 1 to control the open / close state of communication with the above-described components. It has the effect of controlling the supply and interruption of water or compressed air to the house inside pipe 7.

The air supply section 40 is also connected to the inflow section 20 in series, and comprises an air supply valve 41 for controlling the communication state between the supply section conduit 41 and the conduit 12.
As shown in FIG. 2, the air valve 42 controls the opening / closing between the conduit 12 and the supply conduit 41 by rotating the operation part 42A provided on the housing 11 so as to project. One end of a supply conduit 41 of the air supply 40 is connected to a high pressure pipe 44 via a one-touch coupling 43. The other end of the high pressure pipe 44 is connected to a compressor 46 via a one-touch coupling 45.

Since the leakage inspection apparatus 10 of this embodiment is used exclusively for leakage inspection of domestic water pipes, the compressor 46 can be a compressor with a relatively small capacity, and a soundproof type is selected. ing. Of course, this leakage inspection device 10 can also be used for leakage inspection of water mains, etc. buried in public roads, etc., and in the case of leakage inspection of water mains of relatively high-pressure water flow, a high output compressor is used. Connected.

The exhaust part 50 is branched between the inflow part 20 and the outflow part 30, and is composed of an exhaust part conduit 51 and an exhaust valve 52 for controlling the communication state of the conduit 12. The exhaust valve 52, as shown in FIG.
A is provided so as to project to the outside of the housing 11, and in the state where the valves of the respective parts described above are closed, the operation part 5
By opening the exhaust valve 52 via 2A, the air in the device is exhausted. This evacuation operation is performed when it is necessary to re-examine for some reason such as the end of investigation or malfunction of the compressor.

The water leakage is investigated by using the leakage inspection apparatus 10 of the embodiment having the above-mentioned structure. The inspection method is a sound hearing method, a region limitation method, a water amount calculation method, or a combination thereof. However, the preparatory work for the survey is the same for both methods. The contents of the preparatory work will be described below with reference to the flowchart shown in FIG. The first preparatory work is confirmation of the fact of water leakage. For this confirmation, all discharge valves and faucets arranged in the inside pipe 7 are firmly closed (1-1), and in this state, it is confirmed whether or not the water meter 4 arranged in the meter box 2 is operating. (1-2). Water meter 4 in this state
Is not operating, it is determined that there is no leaking site on the inside pipe 7 side (1-3). Also, with the discharge valve and faucet firmly closed, the water meter 4
Is operating, it is determined that water leakage has occurred in any of the house inside pipes 7 (1-4).

When the fact of water leakage is confirmed as described above, the second preparatory work is started. The second preparatory work is a work of inserting and connecting the embodiment leakage inspection device 10 into the water pipe 1 by using the meter box 2 arranged in the house inside pipe 7. In this case, all the discharge valves and faucets arranged in the inside pipe 7 are kept in a tightly closed state. Further, in the water leakage investigation device 10, all valves, that is, the inflow valve 24 of the inflow part 20, the outflow valve 32 of the outflow part 30, the air valve 42 of the air supply part 40, and the exhaust valve 52 of the exhaust part 50 are closed. .

The water meter 4 installed in the meter box 2 closes the water stopper 3 installed immediately before (2-
1), it is removed (2-2). One end of the transparent pipe 26 connected to the inflow part 20 via the one-touch coupling 27 is firmly connected to the water conduit 5 of the water meter 4 that has been removed (2-3). The one-touch coupling 3 is attached to the water supply pipe 6 of the removed water meter 4.
One end of the transparent pipe 34, which is connected to the outflow portion 30 via 5 is firmly connected (2-4). Next, the air supply unit 40 and the compressor 46 are connected via the high pressure pipe 44. In this case, it is confirmed that the output meter of the compressor 46 is 0 Kgf / cm ^{2 and the} supply valve is closed. (2-5).

If necessary, the water leakage investigation device 10
It is also possible to dispose some kind of water stopping means in the water pipe 1 and divide the water pipe 1 at the terminal side to connect the water pipe 1 by insertion. It can also be connected to each faucet provided in the inside pipe 7 of the house. In this case, it goes without saying that it is premised that there is no leaking point in the house-side pipe 7 on the main side from the faucet to which the leak-inspection device 10 is connected.

The operation method of the embodiment leakage inspection apparatus 10 connected to the water pipe 1 and the leakage inspection method will be described in detail with reference to the operation flowcharts shown in FIGS. 4 and 3. The operation flowchart shown in FIG. 4 is an operation flowchart positioned as a setting work for a water leakage investigation using the water leakage inspection apparatus 10 of the embodiment. When the leak inspection device 10 is connected to the water pipe 1 by the above-described operation, the water stopcock 3 is opened (3-1). Next, the inflow valve 24 is opened via the operation unit 24A, so that tap water is supplied to the water leakage investigation device 10 (3-2).

The exhaust valve 52 is operated to be opened while the tap water is being supplied, so that the air in the leak inspection device 10 is exhausted from the exhaust part conduit 51 of the exhaust part 50 by the water pressure of the supplied tap water (3). -3). The supply state of the tap water is visually recognized by the transparent pipe 26. Further, the water pressure supplied into the water leakage inspection device 10 is measured by the pressure gauge 60 and recorded (3-4). Although not an essential operation, all faucets and discharge valves attached to the inside pipe 7 may be opened. By this operation, the air staying in the inside pipe 7 is discharged from the faucet or the like by the water pressure of the supplied tap water, and the accuracy of the amount of air supplied from the water leakage inspection device 10 is improved.
Of course, when the exhaust operation of the inside pipe 7 is completed, all faucets and the like are closed again firmly.

The tap water supplied to the leakage inspection device 10 is
By fully opening the outflow valve 32 via the operation part 32A, the water is supplied to the house inside pipe 7 via the transparent pipe 34 and the water supply pipe 6 by the route of the inflow part 20-the conduit 12-the outflow part 30 (3 -5). In this way, by supplying tap water to the inside pipe 7 of the house, tap water leaks from the leaked portion of the inside pipe 7 of the house. This leakage is
It is measured by the flow meter 22 (3-6). Next, the compressor 46 is started to fill the tank with air (3-
7). If the inside of the house piping 7 is almost full,
By closing the outflow valve 32 via the operation portion 32A,
The supply of tap water to the leak detection device 10 is stopped (3-
8).

When the tank of the compressor 46 is filled with air to some extent, the air valve 42 is fully opened through the operating portion 42A and the operation time is recorded (3-9). The state of the air supplied into the water leakage investigation device 10 is visually recognized through the transparent pipe 34 arranged between the outflow portion 30 and the house inside pipe 7. In this case, as shown in FIG. 2, the transparent pipe 34 is provided with a rising portion so that the supply state of air to the inside pipe 7 can be well identified.

The air pressure supplied from the air supply unit 40 into the water leakage inspection apparatus 10 is measured by the pressure gauge 60, and the compressor 46 is controlled within the range not exceeding the water pressure recorded in the above step (3-4). (3-10). This control of the air pressure is extremely important in order to prevent a part of the inside pipe 7 from being damaged when an air pressure higher than the water pressure is supplied to the inside pipe 7.

Here, in the case where the amount of leaked water measured by the flow meter 22 in the above-mentioned step (3-6) is, for example, 1 L or less per minute, and there is a relatively small amount of leaked water,
Step (3-7) to step (3-10) described above
Only the air by each operation is supplied from the air supply unit 40 to the house inside pipe 7. On the other hand, when the amount of leaked water measured by the flow meter 22 is, for example, 1 L or more per minute, and there is a relatively large amount of leaked water, tap water is supplied together with air to the house inside pipe 7. In this case, step (3
The air pressure supplied to the inside pipe 7 in -10) is up to about 2/3 of the water pressure. Then, the inflow valve 24 closed in step (3-8),
The opening operation is gradually performed via the operation unit 24A (3-1
1). At this time, the inflow valve 24 is a pressure gauge so that the water pressure of the mixed water obtained by mixing the air supplied to the inside pipe 7 and the tap water is within the water pressure of the tap water supplied to the inside pipe 7. While confirming 60, the opening operation is performed.

The air supplied to the in-home pipe 7 gradually moves to the leaking place existing in the in-home pipe 7 and leaks from this leaking place according to the principle of the gas flow characteristics in the fluid conduit described above. Since it takes some time for the air to reach the leak point, the air conditioner waits for a while in the above state (3-12). This waiting time is shortened by increasing the air pressure, but in consideration of prevention of damage to the inside pipe 7 of the house, it is necessary to keep the pressure below the water pressure as described above.

The state in which the air has reached the leakage point can be estimated by the fact that the speed of the air bubbles of the air flowing through the transparent pipe 34 becomes faster. Further, since the supplied air is leaked from the leaking point, the compressor 46 is intermittently started and the indoor pipe 7 is continuously replenished. Therefore, the restart time of the compressor 46 is sequentially recorded (3-13). By the above operation, the setting operation of the water leakage inspection using the water leakage inspection device 10 is completed.

A survey is carried out to identify the water leak location based on the setting operation described above. First, the operation of identifying a water leakage point by the audio listening method will be described with reference to FIG.
The water leak investigation by the sound hearing method is a method using a sound hearing detector, and is basically the same as the conventional method. That is, the sound leak detector listens to the leak sound along the in-home pipe 7 (4-1). When a special leak sound is confirmed by this leak sound investigation (4-2), this is judged as a leak location (4-3). By identifying the leaking point, excavation work is performed to repair the leaking point (4-4).

By the way, the special and large leak sound is generated from the leak point as described above, and since the leak sound is relatively easy to catch, the leak point can be easily determined. By the way, in general, the piping state of the house inside piping 7 should be clear from a piping diagram or the like, but it may be unclear in the case of repeated additional work such as expansion or when it is too old. Even in such a case, the water leakage investigation by the sound hearing method makes it possible to know the piping state of the house inside piping 7 very easily.

As a result of numerous field tests conducted by the inventors, it has been found that the special sound produced by the air supplied to the inside pipe 7 is roughly classified into five sounds depending on the state of a typical leak point. Of course, the leak sounds exemplified below are not all, but in any case, they are identified as leak sounds that are clearly identified from natural sounds. The first is a case where the horizontal inside of the house inside pipe 7 leaks into the soil or the air, and if it is expressed in a pseudo manner, the sound that tap water and air alternately leak is:
Listening by the "bush bush" sound. Also, the sound that leaks only air is heard as a "shoe-shoe" sound.

The second is a case where the horizontal inside pipe 7 leaks into water such as a water pool formed by a leak, and the leaking sound that is simulated is as if it were a straw in a container such as a cup. It is heard by the "bubbling" sound that occurs when blowing air. Thirdly, in the case of flowing through the in-home pipe 7 in a vertical state such as a rising portion, a leak sound that is artificially expressed is a "pocon pocon" sound generated when a bubble bursts on the water surface. Heard by. The fourth is the case of leaking into the soil or the air from the house inside piping 7 in the vertical state, which is a "bush bush" sound and a "pocon pocon" sound or a "shoe shoe" sound and a "pocon pocon sound". ”Sound and heard by. further,
Fifthly, there is a case of leaking into the water from the house inside piping 7 in the vertical state, and the leaking sound that is simulated is heard by the "bounce-bop" sound and the "pocon-pocon" sound.

Therefore, even when the piping state of the inside pipe 7 is unknown, the inside pipe 7 is the special box described above using the sound detector from the meter box 2 to which the leakage inspection device 10 is connected. It can be known by tracing the leak sound. This method is adopted to improve the investigation efficiency even when other leakage investigation methods described later are adopted.

Tables 1 and 2 show the results of the on-site test of the water leakage investigation by the sound hearing method. These Table 1 and Table 2 show the actual measurement values of the sound pressure level between the leak sound of the tap water and the leak sound of the mixed water of tap water and air, and the difference in the sound pressure level based on the measured value. It is summarized for each band. As is clear from these tables, the leakage sound due to the mixed water of tap water and air shows a considerably amplified value in comparison with the leakage sound due to only the tap water, and a slight amount of water leakage in the inside pipe 7 Even then, it is confirmed that the location of the leak can be easily found.

[0056]

[Table 1]

[0057]

[Table 2]

Next, the operation of identifying the area of the water leakage point by the area limiting method will be described with reference to FIG. This area limitation method is a method of simply specifying the area of the water leak location.In practice, the sound leak listening operation described above or the investigation when selecting the faucet for the water volume calculation method described later It is extremely effective when adopted to improve efficiency. This area limitation method is a method of opening and closing a large number of discharge valves and faucets arranged in the inside pipe 7 and determining whether tap water or air flows out at the moment of opening operation. In this case, it should be noted that the opening / closing operation of the faucet should be performed quickly.

That is, the basic operation is performed by sequentially opening the faucets closest to the meter box 2 with all faucets arranged in the domestic water pipe 7 closed. First, the first faucet is quickly opened and closed (5-1). At this time, if there is no outflow of air and only tap water flows out, it means that the air has not reached the first faucet and that the air has leaked out at a water leakage point on the way. Therefore, it is determined that the water leakage location exists in the water pipe 7 inside the house between the first faucet and the meter box 2 (5-2).

Further, when the air flows out, there is a water leakage point further on the tip side, so that the opening / closing operation of the second faucet is quickly performed (5-3). When only tap water flows out from the second faucet, the air does not reach the first faucet, and the air leaks at a water leakage point on the way. In other words, the water leak location is located between the second faucet and the first faucet and the water pipe 7 inside the house is located.
(5-4).

Thereafter, the faucet is opened and closed in sequence to confirm the outflow of air or the outflow of tap water, and when the nth faucet in which only tap water flows out without air outflow is found, It is determined that there is a water leakage point between the nth faucet and the n-1th faucet immediately before it (5-5). Therefore, for example, a sound leak detector or the like is used to investigate the leakage location in the specified area (5-6),
The identified location will be dug up to repair the leaked area (5-7).

By the way, the operation of specifying the area of the water leakage point by the area limiting method is not limited to the method of sequentially opening and closing the first faucet described above, but also the air valve 42 by the step (3-9) of the setting operation. By measuring the restart time of the compressor 46 from the opening operation of step 3 to the step (3-13), the water leakage point of the inside pipe 7 is efficiently narrowed down.

That is, the arrival position of the air in the terminal side pipe 7 can be calculated by the amount of supplied air and the volume of the terminal side pipe 7 when it is assumed that there is no air leakage in the middle. That is, the compressor 46
Is Vt, the air pressure in step (3-9) is Ps, and the air pressure in step (3-13) is Pr.
And the air pressure supplied to the terminal side pipe 7 defined by the pressure gauge 60 of the leak investigation device 10 is Pp. Then, the amount Va of the air supplied into the terminal side pipe 7 from the state in which the compressor 46 is stopped until the compressor is started for the n-th time is
It is calculated by the following formula.

Va = Vt × (Ps−Pr) × (n−1) / (Pp + 1) ... Equation 1

When the pipe diameter of the terminal side pipe 7 is R, the pipe diameter sectional area D of the terminal side pipe 7 is calculated by the following equation. D = (R / 2) ² × π ... Equation 2 Therefore, the reaching distance L of the air amount Va supplied from the leak investigation device 10 into the terminal side pipe 7 is assumed to be the same as that of the terminal side pipe 7. Assuming that: L = Va / D = [Vt × (Ps−Pr) × (n−1) / (Pp + 1)] / (R / 2) ² × π ... Therefore, by performing the opening / closing operation of the faucet in the range based on the reaching distance L, the time required for the water leakage investigation can be shortened.

By the way, the above-described calculation formula is satisfied when all the terminal side pipes 7 have the same diameter and are horizontally piped and there is no branch passage. As described above, depending on the situation of the terminal side pipe 7, it may be dangerous to immediately limit the area of the water leakage location by either tap water or air flowing out from the faucet. Therefore, the information of the faucet that was opened and closed is judged by the following, and the investigation range is narrowed.

Phenomenon 1: Tap water spilled. Cause 1: The investigated faucet is on the meter box side of the leaked area. Cause 2: The investigated faucet is located on the tip side of the water leak point, but for some reason the tap water was not replaced with air. Phenomenon 2: Air flowed out.

Cause 1: Since the horizontal pulling point is located on the tip side of the water leakage point, tap water from the horizontal pulling point to the investigated faucet is replaced with air. Cause 2: If the leaked sound of air is heard from the faucet investigated, there is a leaking point at or near the rising part.

Next, the operation of identifying the area of the water leakage location by the water quantity calculation method will be described with reference to FIG. In this water amount calculation method, air is supplied to the terminal-side pipe 7 in a full state via the water leakage inspection device 10, and when this air reaches the leakage point and leaks from the terminal-side pipe 7, the arbitrary tap is This is a method of calculating the position up to the leak point by opening the operation, measuring the outflow amount of tap water flowing out from this faucet, and dividing by the pipe diameter cross-sectional area. In addition, when the faucet that has been operated to open is on the tip side of the leaking point, the distance to the leaking point obtained by calculation is the distance to the point where air or a mixed water of water flows. Further, when the opened faucet is on the meter boxock side with respect to the water leakage location, the distance to the water leakage location obtained by calculation is the direct distance from the faucet to the water leakage location.

An arbitrary faucet connected to the terminal side pipe 7 in a full state is selected and the faucet is opened (6-1).
In this case, if the faucet is suddenly opened, the terminal side pipe 7
The pressure balance inside may be lost and a backflow phenomenon from the tip side may occur, causing an error in the outflow amount of tap water described later. Therefore, the faucet is slowly opened. By this opening operation, it is checked whether the water flowing out from the tap is tap water or air (6-2). When air flows out, this faucet is quickly closed (6-3), and the next arbitrary faucet is operated. When tap water flows out from the faucet by the opening operation, it is collected by the measuring cup (6-4).

Collection of tap water flowing out from the faucet is continued until air or a mixed water of air and tap water flows out from the faucet, at which time the faucet is quickly closed (6-
5). The amount of tap water collected in the measuring cup in this manner is measured (6-6). The amount of this collection is controlled by the cross-sectional area of the pipe diameter of the terminal side pipe 7 to calculate the distance from the faucet to the water leakage point (6-
7). Therefore, the leakage location is repaired by excavating the location specified by this calculation (6-8).

If the amount of tap water collected from the faucet by the above-mentioned method is Vt and the pipe diameter from the leak point to the tap is assumed to be R, then R is the air leaking from the leak point. Tap water remaining from the location to the faucet will be collected, and the distance L from the faucet to the leak location will be calculated by L = Vt / (R / 2) ² × π ... Equation 4 To be done. In addition, the pipe diameter from the water leak location to the faucet is different, and when the opening operation is performed by selecting an arbitrary faucet, air may leak. Therefore, in order to accurately determine the location of water leakage, it is preferable to sufficiently grasp the pipe diameter of the in-home pipe 7.

By the way, the above-mentioned water leakage investigation device 10 is
In order to make it possible to efficiently carry out various investigation methods, for example, the one provided with the flowmeter 22, the exhaust unit 50 or the pressure gauge 60 is shown, but the investigation is also made by the simple type water leakage investigation apparatus 70 shown in FIG. It is possible. That is, the water leak inspection device 70 includes the flowmeter 22, the exhaust unit 50, or the pressure gauge 6
Although 0 is not provided, the other configuration is the same as that of the water leakage inspection device 10.

Therefore, with regard to the flow meter 22, the outflow amount is measured by connecting the outflow portion of the water leakage inspection device 70 to the inflow side of the water meter 4 arranged in the meter box 2. Further, for the exhaust unit 50, for example, at the time of re-investigation, the compressor 46 is stopped and air is exhausted from the tank, and all faucets are opened to exhaust all the air existing in the house inside pipe 7. This operation does not take much effort when the size of the in-home pipe 7 is small. In addition, this leak inspection device 7
The method of water leakage investigation using 0 is basically the same as that of the water leakage investigation device 10, and detailed description thereof will be omitted.

In the above embodiment, the meter box 2
The case of connecting the water leak inspecting device 10 or the water leak inspecting device 70 to the above to perform the water leak inspecting the inside pipe 7 of the house has been described. Of course, it is also used when conducting a water leak investigation. In addition to water leaks in water pipes, it is needless to say that it is also used for investigation of gas leaks in gas pipes, leaks in sewage pipes, or investigations of leak locations in various fluid conduits. When the fluid in the fluid conduit is a gas, such as a gas pipe, water or the like is supplied to the fluid conduit.

[0076]

As described above in detail, according to the fluid conduit leak investigation apparatus of the present invention, the overall size is small and the handling is extremely simple. Fluid leaks can also be detected accurately, reliably and quickly. Further, the air supplied to the fluid conduit is harmless, the post-treatment after the inspection is easy, and does not adversely affect the fluid conduit.

Further, according to the method for investigating the leak location of the fluid conduit according to the present invention, even if a very small amount of fluid leaks from the existing fluid conduit, the leak sound of the fluid flowing out from the leak location is increased and the special sound is emitted. Therefore, even if not a skilled engineer, the position of the leaked portion can be found very accurately and quickly.

Furthermore, according to the method for investigating the leak location of a fluid conduit according to the present invention, the leak location can be checked by an extremely simple operation such as opening and closing the discharge valve connected to the existing fluid conduit to confirm the presence or absence of gas outflow. It is possible to identify the area where there is water, and it is possible to greatly rationalize the confirmation investigation of the water leakage location with an acoustic detector or the like.

Furthermore, according to the method for investigating the leak location of a fluid conduit according to the present invention, the leak location can be calculated by an extremely simple method such as collecting and calculating the flow rate of the fluid flowing out from the discharge valve connected to the existing fluid conduit. The location of the leak can be found extremely accurately and quickly even if not a skilled engineer, and it exists in a place where it is difficult to be detected by a sound detector due to the presence of structures etc. It is possible to accurately identify the leakage point.

Therefore, according to the method for investigating the leak location of the fluid conduit according to the present invention, the leak location can be accurately found within an extremely short time even if the water leak is a relatively small amount such as the leak of the water pipe. Therefore, it is possible to eliminate waste of valuable water resources, etc., and significantly streamline work efficiency. In addition, even when there is a structure or where noise due to a vehicle or the like makes a lot of noise and it is difficult to detect the sound with a sound detector, it is possible to accurately find the leak point in an extremely short time. Further, the air supplied to the fluid conduit has various effects such that it is harmless, the post-treatment after the investigation is simple, and the fluid conduit is not adversely affected.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a leak inspection device for a water pipe shown as an embodiment of a leak inspection device for a fluid conduit according to the present invention.

FIG. 2 is a perspective view of a main part for explaining a connection state showing a state in which the leakage inspection device is connected to a meter box that is connected to a compressor that is an air supply device and then drawn from a water pipe to a house inside pipe. is there.

FIG. 3 is a flow chart for explaining a preparatory operation for a water leakage inspection of a house inside pipe using the same water leakage inspection device.

FIG. 4 is a flowchart for explaining a setting operation of the water leakage inspection device in the water leakage inspection.

[Fig. 5] 1 of the leakage inspection method using the leakage inspection device
It is a flow chart for explaining water leakage investigation by the sound hearing method which is one.

[Fig. 6] One of the water leakage inspection methods performed using the same water leakage inspection device
It is a flow chart for explaining the leakage investigation by the area limitation method which is one.

[Fig. 7] 1 of the water leakage inspection method using the same water leakage inspection device
It is a flow chart for explaining leakage investigation by the water quantity calculation method which is one.

FIG. 8 is a diagram for explaining a schematic configuration of another embodiment of the water leakage investigation device according to the present invention.

[Explanation of symbols]

 1 Water Pipe 2 Meter Box 3 Water Stopper 4 Water Meter 7 Inside Pipe (Fluid Pipe) 10 Water Leakage Surveying Device 11 Housing 12 Conduit 20 Inflow Port 22 Flowmeter 23 Backflow Prevention Valve 24 Inflow Valve 26 Transparent Pipe 30 Outflow Port 32 Outflow valve 34 Transparent pipe 40 Air supply unit (gas supply unit) 42 Air valve (gas valve) 44 High pressure pipe 46 Compressor 50 Exhaust unit 52 Exhaust valve 60 Pressure gauge

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kyoji Naito 2-16-5 Kokumo, Kofu City, Yamanashi Prefecture (72) Inventor Yoshifumi Miyatake 3-269-3 Kosugicho, Nakahara-ku, Kawasaki-shi, Kanagawa Japan High-Tech Tube Co., Ltd.

Claims (13)

[Claims] 1. An inflow section provided with an inflow valve and connected to a main side of a divided existing fluid conduit, and an inflow section connected to the inflow section via an outflow valve and connected to a terminal side of the divided existing fluid conduit. And an air supply part having one end connected between the inflow part and the outflow part and the other end connected to the compressor via a gas valve. The outflow valve is opened to allow the fluid to flow into the existing fluid conduit, and when the existing fluid conduit is full of fluid, the inflow valve of the inflow section is closed and the gas valve is opened. A fluid conduit leak investigation device, characterized in that gas is supplied from the outflow portion to the terminal side of the existing fluid conduit via the gas supply portion. 2. An inflow section provided with an inflow valve and connected to a main side of a divided existing fluid conduit, and an inflow section connected to the inflow section via an outflow valve and connected to a terminal side of the divided existing fluid conduit. And an air supply part whose one end side is connected between the inflow part and the outflow part and the other end side is connected to the compressor via a gas valve. The gas supplied through the gas supply unit is supplied to the fluid flowing into the chamber, and the mixed fluid of the gas and the fluid is supplied from the outlet unit to the terminal side of the existing fluid conduit. Fluid conduit leak checking device. 3. The inflow section is provided with a backflow prevention valve disposed between the inflow valve and a connection section connected to the main side of the existing fluid conduit. The leak investigation apparatus for the fluid conduit according to claim 2. 4. The leak investigation of the fluid conduit according to claim 1, further comprising an exhaust part provided between the inflow part and the outflow part, the exhaust part having an exhaust valve. apparatus. 5. A pressure gauge for measuring the pressure of the gas supplied from the gas supply section is provided between the inflow section and the outflow section, and the pressure of the gas is below the fluid pressure of the existing fluid conduit. The leak investigation device for a fluid conduit according to any one of claims 1 to 4, wherein: 6. The disconnection of the existing fluid conduit is performed by removing a flow meter of a meter box that measures the flow rate of the fluid arranged in the existing fluid conduit, and is connected to the main side of the removed flow meter. The inflow part is connected and the outflow part is connected to the terminal side so that the meter box of the existing fluid conduit is bypassed and connected. Fluid conduit leak checking device. 7. The gas supplied from the gas supply unit to the existing fluid conduit is formed by forming at least part or all of the conduit connecting at least the outflow portion and the terminal side of the existing fluid conduit to be transparent or semi-transparent. 7. The fluid conduit leak investigation device according to claim 1, wherein the supply state can be identified. 8. An inflow section provided with an inflow valve and connected to a main side of a divided existing fluid conduit, and an inflow section connected to the inflow section via an outflow valve and connected to a terminal side of the divided existing fluid conduit. Using a fluid conduit leak investigation device composed of an outflow section, which has one end side connected between the inflow section and the outflow section, and the other end side connected to the compressor via a gas valve, In a state in which all the discharge valves disposed in the existing fluid conduit are closed, the inflow valve at the inflow portion and the outflow valve at the outflow portion are opened to allow the fluid to flow into the existing fluid conduit and Is full, and in this full state, the inflow valve of the inflow section is closed, and the gas valve of the gas supply section is opened to supply gas into the existing fluid conduit through the outflow section. A method for investigating a leak location in a fluid conduit, which comprises determining a leak location by listening to a leak sound of a mixed fluid of gas and fluid flowing out from the leak location. 9. An inflow section provided with an inflow valve and connected to a main side of a divided existing fluid conduit, and an inflow section connected to the inflow section via an outflow valve and connected to a terminal side of the divided existing fluid conduit. Using a fluid conduit leak investigation device composed of an outflow section, which has one end side connected between the inflow section and the outflow section, and the other end side connected to the compressor via a gas valve, With all the discharge valves arranged on the end side of the existing fluid conduit closed, the inflow valve of the inflow section and the outflow valve of the outflow section are opened to allow the fluid to flow into the existing fluid conduit. The inside of the fluid conduit was filled up, and in this full state, the inflow valve of the inflow section was closed and the gas valve of the gas supply section was opened to supply gas into the existing fluid conduit through the outflow section. , The discharge valve installed in the existing fluid conduit is sequentially opened and closed to check for gas outflow, and the first discharge valve where only fluid flows out and the fluid and gas immediately before that are mixed. A method for investigating a leak location of a fluid conduit, comprising determining that a leak location exists in a region between the fluid and the discharge valve. 10. A leaking sound of a mixed fluid of a gas and a fluid is heard between an exhaust valve of the existing fluid conduit in which only a fluid flows out and an exhaust valve of a mixed fluid of a fluid and a gas flow out. 10. The method for investigating a leak location of a fluid conduit according to claim 9, wherein the leak location is determined by the above. 11. An inflow section provided with an inflow valve and connected to a main side of a divided existing fluid conduit, and an inflow section connected to this inflow section via an outflow valve and connected to a terminal side of the divided existing fluid conduit. Using a fluid conduit leak investigation device composed of an outflow section, which has one end side connected between the inflow section and the outflow section, and the other end side connected to the compressor via a gas valve, In a state in which all the exhaust valves arranged in the existing fluid conduit are closed, the inflow valve at the inflow portion and the outflow valve at the outflow portion are opened to allow the fluid to flow into the existing fluid conduit to Is full, and in this full state, the inflow valve of the inflow section is closed and the gas valve of the gas supply section is opened to supply gas into the existing fluid conduit via the outflow section. , Open any discharge valve installed in the existing fluid conduit to check whether it is a fluid or a gas, and if it is a discharge valve where gas flows out, close it immediately and discharge the fluid. In the case of a discharge valve, by measuring the outflow amount of the fluid until the gas or the mixed fluid of the fluid and the gas flows out, and dividing this outflow amount by the pipe diameter cross-sectional area of the existing fluid conduit, Calculate the distance of
A method for investigating a leak location of a fluid conduit, characterized by determining a leak location. 12. The pipe position of the unidentified existing fluid conduit is preliminarily investigated by listening to the outflow sound of the gas supplied into the existing fluid conduit in a full state. The method for investigating a leak location in a fluid conduit according to item 1 or 2. 13. The existing fluid conduit is a water supply pipe, and the gas supplied from the gas supply unit into the water supply pipe is air.
The method for investigating the leak location of the fluid conduit described in.