JPH0252279A - Detecting device for buried nonmetallic pipe - Google Patents

Abstract

PURPOSE:To specify the target tube even if a conduit is complicated and to detect the conduit by running a metallic spring, a metallic head part, and a rear terminal in the nonmetallic tube and sending an electromagnetic wave out of the nonmetallic tube. CONSTITUTION:The metallic head part 11 is provided to the tip part of the metallic spring 10 so as to serve for earthing and facilitate the insertion into the nonmetallic tube. Further, a terminal 12 for connecting the spring 10 to an electromagnetic wave oscillator 20 is provided to the rear end part of the spring 10. When the oscillator 20 is grounded, a closed loop consists of the oscillator 20, spring 10, and a valve 21. Then when a high-frequency signal is supplied, a magnetic field is produced around the spring 10 and the electromagnetic wave is sent. The electromagnetic wave is detected a receiver on the ground to know the position such as the direction, depth, etc., of the target buried nonmetallic tube.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a nonmetallic pipe detection device that detects the buried position of a nonmetallic pipe buried underground from above ground.

(Prior art and its problems) Currently, there is a sonic detector as a device for detecting non-metallic pipes buried underground. This sound wave detection device searches for the location of emitted sound waves based on the direction and amount of reflected waves.

However, in this type of sonic detection device, when a plurality of conduits are in a complex phase, it is often difficult to identify whether or not the conduit is the target conduit.

The present invention was made to solve this problem, and an object of the present invention is to provide a nonmetallic pipe detection device that can easily identify a target pipe.

(Structure of the Invention) The buried non-metal pipe detection device of the present invention includes a metal spring that is passed through the non-metal pipe, and a metal spring that is provided at the tip of the metal spring to function as a ground and to make it easier to pass through the non-metal pipe. It has a structure including a head made of metal and a terminal provided at the rear end of the metal spring for supplying electromagnetic waves to the metal spring.

(Operation of the Invention) In the present invention, the position of the target conduit is specified by passing a high frequency current through a conductor passed through a non-metallic pipe to emit electromagnetic waves and measuring the directivity and strength of the electromagnetic waves.

(Example) Hereinafter, an explanation will be given based on drawings showing an example of implementation.

In FIG. 1, reference numeral 10 indicates a metal spring serving as a conductor for passing high frequency current. The reason why the conductive wire is spiral-shaped is to allow it to be inserted even if the conduit is winding.

The spiral shape may be formed over the entire length of the conducting wire depending on the length of the intended conduit, or may be formed only on the leading portion of the conducting wire.

In the embodiment, as shown in FIG. 2, the pipe line has a spiral shape over the entire length.

A metal head 11 is provided at the tip of the metal spring 10 to function as a ground and to facilitate passage through a non-metallic pipe.

The head 11 of the embodiment has a semispherical shape because it only needs to move halfway along the front side of the head 11 so that the direction of movement of the following metal spring 10 can be changed according to the bend of the pipe. It is not limited to the surface shape. Any shape that can fulfill its function, such as a teardrop shape, may be used.

Further, this head 11 is made of a metal member so as to function as a ground. Note that the grounding function will be described later.

On the other hand, a terminal 12 is provided at the rear end of the metal spring 10 for connecting the metal spring 10 to an electromagnetic wave oscillator 20 shown in FIG. This electromagnetic wave oscillator 2
For 0, a commonly used value may be used.

In FIG. 2, reference numeral 21 indicates a valve provided in the middle of the pipe. Valves are generally made of metal, except for special ones. Therefore, the metal spring 10 inserted from the end of the conduit has a metal head 1 provided at its tip.
1 comes into contact with the valve 21, so the ground can be taken from this valve 21.

As shown in FIG. 2, the electromagnetic wave oscillator 2 of "1
When 0 is grounded, a closed loop is formed by the electromagnetic wave oscillator 20, the metal spring 10, and the valve 21.

In this way, when a high frequency current is applied, a magnetic field is generated in the metal spring 10 and electromagnetic waves are emitted.

By detecting this electromagnetic wave with a receiver on the ground, it is possible to know the location, direction, depth, etc. of the buried non-metallic pipe.

If there is no valve 21 on the way, the metal head 11 of the metal spring 10 comes out from the other end of the conduit, so it is sufficient to ground the metal head 11 from the other end of the conduit.

(Effects of the Invention) As described above, the present invention provides a metal spring to be passed through a non-metallic tube, and a metal head provided at the tip of the metal spring to function as a ground and to facilitate passage through the non-metallic tube. and a terminal provided at the rear end of the metal spring for supplying electromagnetic waves to the metal spring.Since the electromagnetic waves are emitted from the target non-metallic tube,
Even if the pipes are complex, the target pipe can be identified and the pipe can be easily detected.

Furthermore, since the conducting wire is shaped like a spring and has a head for guiding the conduit at its tip, it can be inserted smoothly even if the conduit is bent, improving work efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view, and FIG. 2 is an explanatory diagram showing the state in which the device is set.

Claims (1)

[Claims] A metal spring that passes through the non-metallic tube, a metal head provided at the tip of the metal spring to function as a ground and make it easier to pass through the non-metallic tube, and a metal head that supplies electromagnetic waves to the metal spring. A buried non-metallic pipe detection device characterized by having a terminal provided at the rear end of a spring.