JPH07253473A - Detection device for buried pipe exploration - Google Patents

Abstract

(57) [Summary] [Purpose] There are no obstacles when carrying or storing, and exploration work can be performed smoothly even in narrow spaces, and exploration work while walking can be performed easily and accurately. PROBLEM TO BE SOLVED: To provide a detection device for buried pipe exploration capable of: [Constitution] A shaft 2 mounted on a detector is constituted by a first shaft 2a and a second shaft 2b accommodating the first shaft, and a lower end portion of the second shaft. By providing the fixing ring 6 for fixing the first and second shafts, the shaft can be expanded and contracted and fixed in a predetermined length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buried exploration detecting device used in a buried pipe exploration device for exploring the position of a buried pipe such as a gas pipe or a water pipe buried underground.

[0002]

2. Description of the Related Art Conventionally, as a method for exploring a buried pipe,
A so-called direct method in which an embedded magnetic field is detected by detecting an alternating magnetic field formed in the vicinity of the embedded pipe by an AC current of one kind (oscillation frequency of several tens KHz) conducted between one point of the embedded pipe and ground Known exploration methods are known. Further, the direct method includes a one-point method, a two-point method, a three-point method, etc., depending on the number of transmission points connected to the pipeline from the transmitter.

As a method for exploring a buried pipe by such a direct method, for example, Japanese Utility Model Laid-Open No. 54-114963 discloses a method using a buried pipe exploration apparatus as shown in FIG. That is, this figure shows the case of using the one-point method among the above direct methods.
After connecting the connecting wire 13 of No. 2 to the exposed portion of the buried pipe 16 and further connecting the connecting wire 14 to the ground electrode 15 inserted in the ground, a signal is transmitted between the buried pipe 16 and the ground electrode 15 from the transmitter 12. When a current is supplied, an alternating magnetic field 17 is generated around the buried pipe 16, and the generated alternating magnetic field 17 is applied to the detector 1
The position of the buried pipe 16 can be known by detecting a signal sound from a speaker provided on the receiver 11 side or by displaying the signal sound on a display.

Here, the basic internal configuration of the oscillator 12 in the above-mentioned buried pipe exploration device is as shown in FIG. 5, for example, and when the oscillation circuit 21 oscillates at an oscillation frequency of several tens KHz, the output amplification circuit. 22 amplifies the oscillation frequency to a predetermined level and outputs it to the buried pipe side via the connecting lines 13 and 14. Reference numeral 23 is an oscillator circuit 21 and an output amplifier circuit 2.
2 shows a power source for supplying drive power to the drive unit 2.

The basic structure of the detector 1 and the receiver 11 in the above-mentioned buried pipe exploration device is as shown in FIG. 6, for example, and the detector 1 has a signal current supplied to the buried pipe 17. A detection coil 1a is provided for detecting the strength of the alternating magnetic field 17 generated as a magnitude of the induced current, and the signal detected by the detection coil 1a is sent to the receiver 11. The signal sent to the receiver 11 is amplified by the amplifier 31, converted into a digital signal by the A / D converter 33 via the filter 32, and input to the microcomputer 34. Based on the input signal, the microcomputer 34 activates the indicator 35 for displaying the signal status by level display, bar graph display, or the like, or generates a signal sound from the speaker 36 to notify the signal status.

[0006]

By the way, conventionally, in order to facilitate the exploration work of the buried pipe by the detector 1 as described above, a buried pipe exploration detecting device as shown in FIG. 2 has been used. A shaft 2 having a connection cord 4 for transmitting a signal from the detector 1 installed therein is erected on the detector 1, and the connection cord 4 is pulled out from an upper end of a handle portion 3 of the shaft 2 to connect the same. A connector 5 is provided at the tip of the cord 4, and the connector 5 is connected to the receiver 11.
The detection coil 1a in the detector 1 is installed so that the shaft 2 is oriented horizontally with the shaft 2 standing vertically, and the operator holds the handle portion 3 of the shaft 2 to maintain the shaft in the vertical direction. On the other hand, the detector 1 is moved along the ground while walking in the vicinity where the buried pipe is supposed to be located, and the buried pipe is searched. As a result, the detection coil 1a horizontally moves along the ground G while traversing the alternating magnetic field 17 generated around the buried pipe 16 as shown in FIG. 3, but at a point directly above the buried pipe 16 as shown in the figure. The induced current generated in the detection coil 1a is maximized, and the buried pipe is searched by recognizing this position on the display of the receiver 11 or the like.

In this conventional buried pipe exploration detecting device, the shaft 2 is set to 800 to 900 mm so that it is convenient for the worker to perform exploration work while walking, but such a length is set. The shaft provided has a problem in that it interferes with the carrying of the detection device and takes an extra space when the detection device is stored. In addition, when performing the exploration work, the shaft 2 of the exploration device must be erected vertically, but when working around the house, there is an obstacle such as a bay window and the shaft 2 is erected vertically. In some cases, it is difficult to carry out exploration work in such a narrow portion, and there is a problem that the exploration work becomes difficult or impossible.

Further, it is difficult to keep the shaft 2 of the exploration device vertical while performing the exploration work while walking, and the angle of the detection coil 1a changes during the work, which is accurate. There was also a problem that the buried pipe could not be searched.

The present invention has been made in order to cope with such a situation and has no trouble in carrying or storing, and can perform exploration work smoothly even in a narrow space, and can walk normally. It is an object of the present invention to provide a buried pipe exploration detecting device capable of performing the exploration work in a comfortable posture and accurately.

[0010]

In order to achieve the above object, a buried pipe exploration detecting device according to the present invention comprises a detector for detecting a magnetic field, a shaft standing upright with respect to the detector, and a shaft inside the shaft. And a connecting cord having one end connected to the detector and the other end connected to the receiver via a connector, by vertically elevating the shaft to horizontally move the detector along the ground. In a buried pipe exploration detecting device for exploring a buried pipe, an expansion and contraction fixing means for elastically fixing the shaft at a predetermined length is provided, and a connecting cord in the shaft is a curl code that is expandable and contractible. It is what

The above-mentioned shaft comprises a hollow first shaft mounted on the detector and a hollow second shaft for accommodating the first shaft, and the first shaft is provided at the lower end of the second shaft. It is characterized in that a fixing ring for fixing the first and second shafts is provided in a state in which is stored for a predetermined length.

Furthermore, a horizontal sensor is provided on the upper surface of the detector to confirm whether or not the detection coil in the detector is horizontal with the ground.

[0013]

By providing the expansion / contraction fixing means for fixing the shaft mounted on the detector to a predetermined length by allowing the shaft to expand and contract,
800 ~ suitable for work while walking during exploration work
It can be fixed to 900 mm and can be fixed to 500 to 550 mm so that it does not take up space when carrying or storing, and the shaft has the required length even when conducting exploration work in narrow areas such as under the bay window of a house. Can be adjusted and fixed.

The shaft is composed of a hollow first shaft and a hollow second shaft for accommodating the first shaft, and the first shaft is accommodated for a predetermined length at the lower end of the second shaft. By providing a fixing ring for fixing the first and second shafts in this state, the state in which all of the first shaft is housed in the second shaft is the shortest state, and the state in which the first shaft is almost pulled out is the longest state. The length can be adjusted to the required length. Then, whether the first shaft and the second shaft are fixed or the lengths thereof can be adjusted can be simply operated by rotating the fixing ring.

Further, since the horizontal sensor is provided on the upper surface of the detector, it can be confirmed by the horizontal sensor that the detection coil in the detector is oriented in the horizontal direction even during the exploration work while walking.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings (note that the same parts as in the prior art will be designated by the same reference numerals and duplicate description will be omitted). 1A and 1B are views showing a buried pipe exploration detecting device according to an embodiment of the present invention. FIG. 1A is a side view thereof, and FIG. 1B is a partial sectional view of FIG.

Reference numeral 1 is a detector incorporating the above-mentioned detection coil. Reference numeral 2a is a first shaft that is installed upright on the detector 1, and 2b is a second shaft that houses this first shaft. Both the first shaft and the second shaft are hollow cylindrical tubes made of aluminum or the like, and the first shaft 2a is installed so as to be freely slidable inside the second shaft 2b. Outer periphery and second
A stopper is provided on the inner peripheral portion of the lower end portion 20b of the shaft to prevent the first shaft 2a from falling off from the second shaft 2b. The length of the first shaft and the second shaft is 500 to 550 mm in the shortest state where all the first shafts are housed in the second shaft.
Further, the total length is set to 800 to 900 mm in the longest state where the first shaft is pulled out to the maximum.

The lower end 20b of the second shaft 2b
The stationary ring 6 is provided with a rotating ring 6a and a tightening ring 6b. The tightening ring 6b is an elastic split ring having a tapered outer surface, is installed in the rotating ring 6a, and is arranged on the outer periphery of the first shaft 2a. The rotating ring 6a has a threaded portion on its inner surface that engages with a threaded portion provided on the outer periphery of the lower end portion 20b of the second shaft, and rotates the rotating ring 6a so as to rise with respect to the second shaft. By doing so, the inner surface of the lower end of the rotating ring 6a presses the tapered side surface of the tightening ring 6b, and the outer circumference of the first shaft is tightened by the tightening ring 6b, and the first shaft and the second shaft are fixed.

A curl cord 8 serving as a connecting cord for transmitting a signal from the detector 1 is provided inside the first shaft 2a and the second shaft 2b, and is connected to the connecting cord 4 pulled out from the upper end of the second shaft. The curl cord 8 expands and contracts according to the expansion and contraction of the shaft by the first shaft and the second shaft.

As described above, since the buried pipe exploration detecting device in the embodiment is provided with the expansion / contraction fixing means for the shaft, which is composed of the first shaft 2a, the second shaft 2b and the fixing ring 6, the first shaft is replaced by the second shaft. By fixing the 1st shaft and 2nd shaft in the shortest state that they are all stored in the shaft, the shaft can be shortened to a length that does not hinder carrying and storage, and in the longest state where the 1st shaft is pulled out to the maximum extent. By fixing the first shaft and the second shaft, the shaft can be extended to a length convenient for exploration work while walking. In addition, the length of the shaft can be freely adjusted between the above-mentioned minimum and maximum lengths, so even in narrow areas where the height is limited, adjust the shaft to the required length for smooth work. It can be carried out.

A horizontal sensor 7 is provided on the upper surface of the detector 1. The horizontal sensor 7 may be a simple sensor that detects bubbles in a sealed liquid and detects the horizontal state from the position of the bubbles. Since the worker can work while looking at the horizontal sensor 7 provided on the upper surface of the detector 1, it can be confirmed that the detection coil installed in the detector is oriented in the horizontal direction, and accurate search work can be performed. It can be carried out.

[0022]

Since the present invention is constructed as described above,
The following effects are achieved. (1) The length of the shaft can be adjusted to a required length by providing an expansion and contraction fixing means that allows the shaft attached to the detector to be expanded and contracted and fixed at a predetermined length. Fixed to the appropriate length,
Since it can be fixed to a length that does not take up space when carrying or storing, you can perform smooth exploration work by adjusting the shaft to the required length even in narrow spaces, and there is no problem when carrying or storing. Also, exploration work while walking can be performed in a comfortable posture.

(2) The above shaft is composed of a hollow first shaft and a hollow second shaft for accommodating the first shaft, and the first shaft is accommodated for a predetermined length at the lower end of the second shaft. By providing a fixing ring that fixes the first and second shafts in this state, it is necessary from the shortest state in which all the first shafts are stored in the second shaft to the longest state in which the first shafts are almost pulled out. The length of the shaft can be adjusted to any length. Further, whether the first shaft and the second shaft are fixed or the lengths thereof can be adjusted only by rotating the fixing ring. Therefore, the length of the shafts can be adjusted by a simple operation.

(3) Since the detector is provided with a horizontal sensor,
Even during the exploration work while walking, it is possible to perform the work while confirming that the detection coil in the detector is oriented in the horizontal direction by the horizontal sensor, and it is possible to accurately search the buried pipe.

[Brief description of drawings]

FIG. 1 is a side view and a partial cross-sectional view showing a detection device for exploring a buried pipe according to the present invention.

FIG. 2 is a side view of a conventional buried pipe exploration detection device.

FIG. 3 is an explanatory diagram of a detection operation by a buried pipe exploration detection device.

FIG. 4 is an explanatory diagram of an exploration method using the buried pipe exploration device.

FIG. 5 is an explanatory diagram showing a basic configuration of a transmitter of the buried pipe exploration device.

FIG. 6 is an explanatory diagram showing a basic configuration of a detector and a receiver of the buried pipe exploration device.

[Explanation of symbols]

 1 Detector 2 Shaft 2a First Shaft 2b Second Shaft 3 Shaft Handle 4 Connection Cord 5 Connector 6 Fixing Ring 7 Horizontal Sensor 8 Curl Cord

Claims (3)

[Claims] 1. A buried pipe exploration detecting device for detecting a position of the buried pipe by detecting a magnetic field generated by passing an electric current through the buried pipe laid in the ground. The detection device for use in a receiver includes a detector that detects the magnetic field, a shaft that is erected vertically to the detector, one end that is inserted into the shaft and that is connected to the detector at one end, and the other end to the receiver through a connector. With a connection cord to be connected,
In a buried pipe exploration detecting device for exploring a buried pipe by vertically erecting the shaft and horizontally moving the detector along the ground, an expansion / contraction fixing means for elastically fixing the shaft at a predetermined length. A detection device for exploring a buried pipe, characterized in that the connection cord inside the shaft is a curl cord that is expandable and contractible. 2. The shaft comprises a hollow first shaft mounted on a detector and a hollow second shaft for housing the first shaft, and the first shaft is provided at a lower end portion of the second shaft. First and second when stored for a specified length
The embedded pipe exploration detecting device according to claim 1, further comprising a fixing ring for fixing the shaft. 3. The buried pipe exploration device according to claim 1 or 2, wherein a horizontal sensor is provided on the upper surface of the detector to confirm whether or not the detection coil in the detector is horizontal with the ground. Detection device.