JP2003119838A - Method of inspecting leakage of water feed piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily determine whether water is leaking from piping supplied with water near a place where a shutoff valve is installed, in the case that the supply of water is stopped due to an earthquake. SOLUTION: A conduit (piping) 2 leading from a water tank 1 can be shut off by a shutoff valve 3a in an earthquake. A bypass 4 joined with the conduit 2 over an area extending from a position in front of the shutoff valve 3a to a forward position allows water to pass through from the water tank 1 when the conduit is shut off by the shutoff valve 3a. A detector 7 provided in the bypass 4 is used to detect the passage of water in the bypass 4 to determine whether water is leaking from the part of the water-fed piping 2a beyond the shutoff valve 3a and determine the amount of leakage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portion of a pipe on the side to be supplied with water before the shutoff valve when the shutoff valve that has closed due to an earthquake and shuts off the water passage from the water supply tank is returned to pass water. The present invention relates to a water leakage inspection method for water supply pipes to check whether or not water has been damaged due to damage.

[0002]

When a pipe on the water supply side is damaged due to an earthquake and water leaks, water cannot be resumed from the water supply tank until the damaged portion of the pipe is repaired. On the other hand, when supplying water to factories and condominiums,
An emergency shutoff valve device (for example, an emergency shutoff valve device provided with a shutoff valve capable of shutting off the waterway by closing due to an earthquake in the waterway from the water tank)
Japanese Patent No. 3189117) is installed,
Safety measures have been taken to deal with water leakage accidents caused by damage to pipes.

However, in order to return the closed shut-off valve and resume water flow, it is necessary to confirm in advance whether or not water leakage due to damage has occurred in the pipe on the water supply side. Is currently relying on surveys by workers at the piping site. Therefore, it is unavoidable that a lot of labor and time are required for the confirmation work, and there has been a demand for a method capable of performing the confirmation easily and quickly. An object of the present invention is to easily confirm the leakage state of the pipe on the water supply side in the vicinity of the location where the emergency shutoff valve device is installed, and at the same time, when the waterway is shut off, the emergency water supply from the water supply tank is also possible. It is to provide a new leakage check method for water supply pipes.

[0004]

In order to achieve the above object, a method of inspecting water leakage of a water supply pipe, which is a feature of the present invention, is that a water passage from a water supply tank can be shut off by a shutoff valve when an earthquake occurs. The bypass that is connected to the waterway from the front position to the forward position allows water to pass from the water tank when the waterway is shut off by the shutoff valve, and the water flow state in the bypass is checked by the detector provided in the bypass. By detecting, the presence or absence of water leakage and the amount of water leakage in the pipe portion on the water supply side ahead of the shutoff valve are determined.

Further, in this method for checking water leakage of the water supply pipe, at least the front side of the bypass is allowed to communicate with the water channel side through the opening / closing cock which is closed at all times (when water is flowing when the water channel is open). ing. In addition, a water faucet located at the front of the detector that is always open at the bypass branch is used to allow pooled water in the bypass to flow out from this faucet, preventing freezing in the bypass in winter. At the same time, the faucet can be used as a faucet for emergency water supply, and can also be supplied to a distant place by connecting a water supply hose or the like. And if a three-way cock is used for the opening and closing cock provided on the front side of the bypass, there is a sanitary advantage that the inside of the bypass can always be opened to the atmosphere side, and by using a water meter such as a water meter as a detector. , The cumulative amount of water used (or distributed) in an emergency can be accumulated.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, equipment for carrying out the method of the present invention will be described with reference to the drawings. Reference numeral 1 is a water supply tank, 2 is a front portion of a pipe serving as a water channel from the water supply tank 1, an emergency shutoff valve device 3 is installed in the pipe 2, and 3a is a shutoff valve thereof. The shutoff valve 3a has a function of closing the water channel by closing the emergency shutoff valve device 3 when the emergency shutoff valve device 3 is activated due to an earthquake, and keeps the water channel shut off unless the emergency shutoff valve device 3 is restored. is doing.

A bypass 4 is continuously provided in the pipe 2 from a front position where the shut-off valve 3a is installed to a front position, and the bypass 4 is connected to the pipe 2 side through normally open / close cocks 5 and 6. And are connected respectively. In particular, if a three-way cock is used as the opening / closing cock 5 on the front side, it is possible to open the inside of the bypass cut off from the pipe 2 to the atmosphere.
A detector 7 for detecting the water flow state in the bypass 4 is provided at an intermediate portion of the bypass 4, and a normal water meter, a water pressure gauge, or the like can be used as the detector 7.

Further, in the emergency shutoff valve device 3, for example, when an earthquake occurs, a heavy sphere for detecting an earthquake falls from the supporting portion to remove the stopper of the shutoff valve 3a, and the shutoff valve 3a is rotated by a spring action. Since a publicly known one described in the patent publication of Japanese Patent No. 3189117, which performs the closing operation in a closed manner, can be used, detailed description thereof will be omitted. Furthermore, a faucet 9 is provided at a portion of the bypass 4 between the opening / closing cock 6 on the front side and the detector 7 through a T-shaped cheese pipe 8, and the faucet 9 collects the accumulated water in the bypass. To escape, it is always open (when the pipe 2 serving as a water channel is open and placed under water flow, but the bypass 4 is blocked from the water channel side).

The water faucet 9 connects a water supply hose or the like (not shown) by connecting the front side of the bypass 4 to the water supply tank 1 side in an emergency when the pipe 2 side is cut off, thereby connecting the water supply faucet in an emergency. Can be used as In addition, it is preferable that the bypass 4 has a slight downward slope toward the T-shaped cheese tube 8 side so that the accumulated water can smoothly flow out. Further, the pipe 2 usually has an outer diameter of 50 to 150 mm, and the bypass 4 has a diameter of about 25 mm.

Next, the method of the present invention will be described. When an earthquake occurs and the emergency shutoff valve device 3 is activated, and the water passage is shut off by the shutoff valve 3a to stop water flow, when the emergency shutoff valve device 3 is restored and water flow is restarted, first, The opening and closing cocks 5 and 6 are opened to connect the bypass 4 to the water supply tank 1 side, and water is passed to the water supply side pipe 2a side ahead of the shutoff valve 3a to check for leakage of water on the pipe 2a side. . Young
If the pipe 2a on the water supply side is damaged, there is water leak in the pipe 2a and a flow of water is generated in the bypass 4, so the leak state can be detected by the detector 7.

That is, the amount of water leakage changes depending on the state of damage of the pipe 2a on the water supply side, so the extent of the damage depends on the bypass 4
It is possible to judge by reading the flow rate in the inside by the detector 7, and if there is no water flow in the bypass 4, it is easy to confirm that there is no leaking point on the pipe 2a side and there is no damage to the pipe 2a. Therefore, the emergency shutoff valve device 3 can be returned to restart the water supply from the water supply tank 1. Also, the pipe 2a
When water leakage on the side is detected and water cannot be supplied from the side of the pipe 2a due to damage, emergency water can be supplied from the water tank 1 through the bypass 4 using the faucet 9 that causes the accumulated water in the bypass 4 to flow out.

[0012]

EFFECTS OF THE INVENTION The present invention is as described above, and since the state of water leakage on the tip side of the pipe can be easily confirmed by the detector installed in the vicinity of the emergency shutoff valve device, the labor of checking every corner of the pipe is required. It is possible to prevent the inconvenience of accidentally returning the emergency shutoff valve device even if the pipe is damaged. In addition, in the case of an emergency where normal water supply from the piping side is not possible, water can be supplied through a bypass, and in combination with the fact that it is easy to implement with a simple device and the safety of water supply equipment can be secured, it is practical. The value is enormous.

[Brief description of drawings]

FIG. 1 is a perspective view showing a water supply facility in which a method of the present invention has been carried out with a part cut away.

[Explanation of symbols]

1 is a water tank 2 is the front part of the pipe that becomes the waterway 2a is the pipe on the water supply side 3 is an emergency shutoff valve 3a is a shutoff valve 4 is bypass Opening cocks 5 and 6 7 is a detector 8 is a T-shaped cheese tube 9 is a faucet

Claims (3)

[Claims] 1. A water channel from a water supply tank can be shut off by a shutoff valve when an earthquake occurs, and a bypass connected to the waterway from a position in front of this shutoff valve to a forward position is connected to the water tank when the waterway is shut off by the shutoff valve. Water is allowed to flow through the bypass, and the presence or absence of water leakage and the amount of water leakage in the pipe portion on the water supply side ahead of the shutoff valve are determined by detecting the water flow state in the bypass by the detector provided in the bypass. Leakage inspection method for water supply piping characterized by 2. The water leakage inspection method for a water supply pipe according to claim 1, wherein the bypass can communicate with the water channel side through an opening / closing cock. 3. The accumulated water in the bypass is discharged from a normally open faucet provided at a branch portion of the bypass located ahead of the detector.
Alternatively, the method for checking water leakage of the water supply pipe according to 2 above.