JPH116781A - Detection of leakage water from pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the detecting of leakage water from a pipeline readily and to make it possible to grasp the presence or absence of the leakage water in real time. SOLUTION: A sensor tape 4 as the water leakage detecting means is added along the longitudinal direction at the lower side of a drain pipe 3. This sensor tape 4 is the tape, wherein a pair of strip aluminum foils are held in parallel between an insulating sheet comprising the thin synthetic resin such as vinyl chloride and a paper sheet, which is overlapped so as to cover the surface of one side. The ends of the above- described respective aluminum foils are connected to the + terminal and the - terminal of an insulation-resistance meter 5 provided in the chamber through conductors, respectively. If the water leakage does not occur when the water is made to flow through the drain pipe, the part between a pair of the aluminum foils at the sensor tape 4 is maintained at the insulated state, and the resistance value indicated on the insulation-resistance meter 5 becomes close to ∞. When there is the water leakage on the contrary, the part between a pair of the aluminum foils at the sensor tape 4 is conducted at the part of the water leakage, and the resistance value indicated on the insulation-resistance meter 5 becomes close to approximately 0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pipe for a building, etc.
The present invention relates to a technique for detecting water leakage in various pipes through which water passes.

[0002]

2. Description of the Related Art Drainage pipes and the like disposed in a building may leak if there is a defect in the installation of packing at a joint portion or a defect in the piping itself. For this reason, immediately before the completion of the building, the drainage inspection of the drainage pipe and the like is performed. Conventionally, this water leakage inspection is performed by passing water through a pipe to be inspected and visually checking the presence or absence of water leakage.

[0003]

However, for example, in the case of a pipe provided between a floor slab and a ceiling plate, an inspection port provided in each part of the ceiling plate is required for visually inspecting water leakage. Workers had to crawl through the narrow space behind the ceiling, which made the work difficult. Moreover, since such a place is dark, water leakage cannot be easily found, and in many cases, it cannot be found unless there is a large amount of water leaking into the room through the joint of the ceiling plate.

[0004] The present invention has been made under the above circumstances, and the technical problem thereof is that it is possible to easily detect water leakage, and to confirm the presence or absence of water leakage in real time. It is to provide a method that can do it.

[0005]

As a means for effectively solving the above-mentioned technical problems, a method for detecting water leakage in a pipe according to the present invention is provided along a pipe to be detected for water leakage in a longitudinal direction of the pipe. A pair of conductors which are continuously separated from each other and a water leakage detecting means comprising an electrically insulating water-absorbing sheet interposed in a contact state between the two conductors are arranged, and a predetermined amount of water is passed between the pair of conductors while passing water through the pipe. A voltage is applied, and a change in the output of the water leakage detecting means due to a change in electric resistance between the conductors is detected. Note that the water-absorbing sheet refers to a sheet made of a material that is easily wetted by water and soaks in water.

In the above method, when there is no water leakage from the pipe through which water has passed, the water leakage detecting means arranged along the pipe uses a water-absorbing sheet dried over the entire length thereof.
Although the pair of conductors are insulated from each other (resistance value = ∞), if the water-absorbing sheet gets wet due to water leakage, the insulating property of the water-absorbing sheet is lost at this portion due to the conductivity of water. Significantly decreases. Therefore, by detecting a change in the output of the water leak detecting means due to a change in the insulation resistance between the conductors, the presence or absence of the water leak can be grasped at a position remote from the pipe.

[0007] In the method of the present invention, typically, the conductor is made of strip-shaped aluminum foil, the water-permeable sheet is made of strip-shaped paper, and the water leakage detecting means is provided on a flexible insulating sheet and a surface thereof. A sheet formed by sandwiching a pair of the aluminum foils extending in parallel with each other in the longitudinal direction between the stacked paper sheets is used. That is, since the leak detecting means having such a configuration is in the form of a flexible band, even if the pipe to be subjected to the leak detection is meandering, it can be reliably arranged along the pipe.

[0008]

1 and 2 show a preferred embodiment of a method for detecting water leakage in a pipe according to the present invention.
First, in FIG. 1, reference numeral 1 denotes a floor slab of a building, 2 denotes a ceiling plate supported by hanging bolts and lightweight steel frames (not shown) below the floor slab 1, and 3 denotes an upper floor side of the floor slab 1. This is a drain pipe arranged in the space S behind the ceiling between the floor slab 1 and the ceiling plate 2. This drain pipe 3
A plurality of pipes 31 are extended by being connected via a pipe joint 32, and the upper ends thereof are suspended bolts 33 buried in the floor slab 1 and the support rings 3 attached to the lower ends thereof.
4 and the surroundings are heat insulating material and sound insulating material 3
5 coated.

A heat insulating material and a sound insulating material 3 are provided below the drain pipe 3.
Before being surrounded by 5, a sensor tape (for example, a product of Nippon Advanced Paper Industry Co., Ltd.) 4 as a water leakage detecting means is attached along the longitudinal direction. As shown in FIG. 2, the sensor tape 4 includes an insulating sheet 41 made of thin synthetic resin such as vinyl chloride, a paper sheet 42 stacked so as to cover one surface thereof, Sheet 4
2 and a pair of strip-shaped aluminum foils 43 and 44 extending in parallel with each other in the longitudinal direction and attached to the drain pipe 3 so that the paper sheet 42 faces upward. .

The ends of the aluminum foils 43 and 44 in the sensor tape 4 are connected to the + of the insulation resistance meter 5 installed in the room.
The terminal and the negative terminal are connected to each other via a conducting wire.

Next, water is caused to flow through the drain pipe 3 and the insulation resistance meter 5 is used.
, A constant voltage is applied between the aluminum foils 43 and 44 of the sensor tape 4. At this time, if there is no defect in the packing of the pipes 31 and the pipe joints 32 in the drain pipe 3 and no water leakage occurs, the paper sheet 42 of the sensor tape 4 is kept dry, and the paper sheet 42 itself is maintained. Is electrically insulative, the resistance value indicated by the insulation resistance meter 5 is close to Δ. On the other hand, when water leaks due to a defect in the packing 31 or the like of the pipe 31 or the pipe joint 32, the paper sheet 42 of the sensor tape 4 is wetted with water immediately below the water leak point, and the paper sheet is formed by the conductivity of water. Since the insulation of the sheet 42 is lost, a current flows between the aluminum foils 43 and 44,
The resistance value indicated by the insulation resistance meter 5 becomes almost zero.

Therefore, the presence or absence of a slight leak can be easily grasped only by monitoring the indicated value of the insulation resistance meter 5 in the room, and the worker can check the space S above the ceiling only when the leak is detected. Then, it is sufficient to take necessary measures such as replacing parts. Also, the sensor tape 4 is inexpensive,
There is no particular problem if it is left unremoved after the leakage test.

In the above-described embodiment, the ready-made sensor tape 4 is used as the water leak detecting means. However, the present invention is not limited to this, and the water leaks between the pair of conductors arranged along the pipe. What is necessary is just to be partially conductive. As means for displaying the output from the water leak detecting means, in addition to the insulation resistance meter 5 in the above-described embodiment, for example, lighting of a lamp or the like by the output from the water leak detecting means, or sound such as a buzzer or the like. It is also possible to adopt a method of notifying a leak. In the above-described embodiment, the sensor tape 4 is arranged along the lower side of the drain pipe 3. However, for example, in a portion extending in the vertical direction, it is effective to spirally wind the outer circumference of the pipe.

[0014]

According to the method for detecting water leakage in a pipe according to the present invention, it is possible to immediately grasp the presence or absence of water leakage even if an operator does not enter a narrow pipe space such as a space above a ceiling, and even if a small amount of water leaks, Can be detected.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a preferred embodiment of a pipe water leakage detection method according to the present invention.

FIG. 2 is a schematic explanatory view showing a structure of a sensor tape used as a water leak detecting means in the embodiment.

[Explanation of symbols]

 Reference Signs List 3 drainage pipe 4 sensor tape (water leakage detecting means) 41 insulating sheet 42 paper sheet (water absorbing sheet) 43,44 aluminum foil (conductor) 5 insulation resistance meter

Claims (2)

[Claims] 1. A water leakage detection device comprising a pair of conductors which are continuous in the longitudinal direction of the piping and are separated from each other along the piping to be detected, and an electrically insulating water absorbing sheet interposed between the two conductors in a contact state. Means for arranging means, applying water to the pipe and applying a predetermined voltage between the pair of conductors, and detecting a change in output of the water leakage detection means due to a change in electrical resistance between the conductors. Water leak detection method. 2. The method according to claim 1, wherein the conductor is made of a strip-shaped aluminum foil, the water-absorbing sheet is made of a strip-shaped paper, and the water leakage detecting means is a flexible insulating sheet and a paper sheet superposed on the surface thereof. Characterized in that a pair of the aluminum foils extending in parallel with each other in the longitudinal direction are sandwiched between the aluminum foil and the aluminum foil.