JPH0577680U - Underground pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an underground buried pipe capable of easily detecting a damaged portion of a piping line buried underground. [Structure] Two conductors 2 are arranged in parallel in the longitudinal direction along a pipe surface of a pipe line buried in the ground, and one end of each conductor 2 is connected to a power source of a control box 4. , The respective conductors 2, 2 are connected in parallel via the resistor 3 at predetermined intervals along the longitudinal direction. [Effect] The breakage of the conductor, that is, the broken part of the buried pipe can be detected only by passing an electric current through one end of the two conductors, so that the leakage accident of the fluid in the pipe such as gas can be prevented. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an underground buried pipe capable of easily detecting a damaged portion when a piping line buried underground is damaged.

[0002]

[Prior art and its problems]

 During civil engineering work, laying of buried pipes, etc., the location of the pipes such as gas pipes and water supply pipes buried in the ground cannot be confirmed. There is. At this time, if the pipe is severely damaged and the fluid in the pipe such as gas is ejected, the broken portion of the pipe can be confirmed from the position where the fluid in the pipe is ejected, but it is minor such that the pipe is cracked or cracked. It was not possible to confirm the breakage of the pipe with such a severe breakage, and there was no means for easily detecting the broken part of the pipe. For this reason, there was a problem that the damage of the pipe progressed from the cracks and cracks created during the construction, resulting in a large leak accident.

The present invention has solved the above-mentioned problems. When the buried pipe is damaged by a shovel or the like, an electric current is applied to two conductors that are longitudinally arranged along the pipe surface of the pipe line. It provides an underground buried pipe that can detect a broken portion of the pipe simply by measuring the resistance value.

[0004]

[Means for Solving the Problems]

 According to the present invention, two conductors are wired in parallel in the longitudinal direction along the pipe surface of a pipe line buried in the ground, one end of each conductor is connected to the power supply of the control box, and It is characterized in that the conductors are connected in parallel through a resistor at predetermined intervals along the longitudinal direction.

[0005]

[Work]

 When the conductor breaks due to the breakage of the buried pipe, the total resistance value of the resistors connected in parallel can be measured up to the damaged part of the conductor by applying an electric current to the two conductors. It is possible to detect the damaged part of the buried pipe.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a piping line showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which a conductor wire is laid on the surface of the piping, where reference numeral 1 is a synthetic resin pipe, cast iron. Pipes such as pipes, 2 are conducting wires, and 3 are resistors such as nichrome wires.

The pipe 1 is buried in the ground as a transport pipe for gas, water, etc., and one end of this pipe line is connected to a fluid source 5 for gas, water, etc. as shown in FIG. Therefore, each end of the branch pipe branched from the main pipe of the piping line is connected to the equipment installed in each house. In this pipe line, when the pipe 1 is buried in the ground, two conductors 2 are arranged in parallel in the longitudinal direction along the pipe surface as shown in FIG. Then, one end of each of the conductors 2 and 2 is connected to the power source of the control box 4, and each of the conductors 2 and 2 is connected in parallel via the resistor 3 at predetermined intervals along the longitudinal direction. To do.

The interval L between the resistors 3 and 3 can be set to an appropriate interval depending on the embedding area of the pipe, the embedding place, etc. Normally, the resistors 3 are arranged at intervals of several meters to several tens of meters. It is good to arrange. Further, it is preferable that all the resistors 3 have the same resistance value, but the resistors 3 having different resistance values may be used. In this case, it is preferable to set the resistance value of the resistor 3 to increase as the distance from the control box 4 increases.

When the conductor 2 and the resistor 3 are fixed to the surface of the pipe 1, the conductor 2 and the resistor 3 may be integrally fixed with a transparent synthetic resin tape or the like. By doing so, it is possible to see the wiring state through a transparent tape or the like and to reliably prevent malfunctions due to the conductor 2 or the resistor 3 being affected by rainwater, groundwater, or the like. After fixing the conducting wire 2 and the resistor 3 to the surface of the pipe 1, the earth and sand etc. are backfilled and the piping work is completed.

On the other hand, the piping line of the pipe 1 and the resistance value of each resistor 3 are input to the control box 4, and the wiring line of the control box 4 displays the position of the piping line and each resistor 3.

When the pipe 1 buried in the ground is damaged, the damaged part is detected as follows. For example, assuming that in the piping line displayed on the wiring board of the control box 4, the piping 1 is damaged at the rear position of the n-th resistor 3, and at the same time the conductor 2 is broken, the control box 4 The total resistance value R obtained by adding the resistance values R1, R2, ... R = 1 / (1 / R1 + 1 / R2 + ... + 1 / Rn)

The total resistance value R is calculated from the resistance values R1, R2 ... Rn of the resistors 3 which are input in advance in the control box 4, and the nth resistance value from the resistance value R is calculated. Detecting from the wiring box of the control box 4 that the conductor 2 is broken between the position where the body 3 is provided and the position where the next n + 1th resistor 3 is provided and the buried pipe is damaged. You can Therefore, the damaged pipe is repaired by excavating the ground where the buried pipe is damaged.

[0013]

[Effect of the device]

 As explained above, in the underground pipe of the present invention, two conductors are arranged in parallel in the longitudinal direction along the pipe surface of the piping line, and the respective conductors are arranged at predetermined intervals along the longitudinal direction. Since they are connected in parallel via a resistor, it is possible to easily detect the damaged part of the buried pipe simply by passing a current through one end of the conductor connected to the control box and measuring the resistance value. It is possible to prevent accidents such as fluid leakage in pipes.

[Brief description of drawings]

FIG. 1 is a schematic view of a piping line showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a conductor is wired on the surface of a pipe.

[Explanation of symbols]

 1 Piping 2 Conductor 3 Resistor 4 Control box

Claims (1)

[Scope of utility model registration request] 1. Two conductors are arranged in parallel in the longitudinal direction along a pipe surface of a pipe line buried in the ground, one end of each conductor is connected to a power source of a control box, and An underground buried pipe, characterized in that conductors are connected in parallel along a longitudinal direction at predetermined intervals via a resistor.