JPS63142213A - Apparatus for measuring horizontal displacement of underground drilling machine - Google Patents

Abstract

PURPOSE:To simply and continuously measure the horizontal displacement of an underground drilling machine, by arranging a pair of measuring systems each measuring the horizontal displacement of the underground drilling machine so as to hold the obstruction present on the surface of the ground in a drilling direction therebetween. CONSTITUTION:A pair of measuring systems, which measure the horizontal displacement of an underground drilling machine 1 with respect to a drilling execution projected line 12 by the magnetic induction action between the loop-shaped signal wires 9a, 9b laid along the projection line 12 and the pillot head 2 provided to the leading end of the underground drilling machine 1, are arranged so as to hold the obstruction 10, for example, the rail present on the surface of the ground in a drilling direction therebetween. The measuring systems are connected by a radio circuit and the horizontal displacement of the drilling machine 1 along the projection line 12 containing the presence action of the obstruction 10 is measured by the cooperation of the measuring systems. By this constitution, the measuring systems measure the induced voltage generated by the magnetic induction action between the signal wires 9a, 9b and the head 2 and the horizontal displacement of the defense range of each system is measured on the basis of said voltage and, when the drilling machine 1 is positioned under the obstruction 10 on the surface of the ground, the horizontal displacement of the drilling machine is measured by the measuring systems cooperated by information transmission due to the radio circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a horizontal displacement measuring device for measuring horizontal displacement of an underground excavator.

(Prior art) When laying water M pipes, gas pipes, or electric power 2 communication cables underground, small diameter pilot holes are drilled.
At this time, there is a device disclosed in Japanese Patent Publication No. 11030/1983, which measures whether the underground excavator is moving along the planned construction line without horizontally displacing left or right. This is done by attaching a magnetic field generating element to the tip of the underground parking machine so that it always faces vertically, and generating an alternating magnetic field from this magnetic field generating element toward the ground surface. The ground point directly above where the tip of the underground excavator body is located is detected by detecting it with a magnetic detection element attached to the same circumferential surface above and moving the mobile cart in the direction where the same reception level is obtained. , the left and right horizontal displacement is determined by comparing the ground surface point with the planned construction line.

(Problem to be Solved by the Invention) However, since the above-mentioned conventional device measures the horizontal displacement of the underground excavator by moving the movable trolley, it is time consuming and requires at least the time required to move the movable trolley. There is a problem in that it requires a staff member and a staff member to monitor the reception level of the magnetic detection element, which is troublesome. Another problem is that horizontal displacement cannot be measured continuously. Furthermore, if there are obstacles such as tram rails on the ground surface in the excavation direction, there is a problem that measurement becomes impossible.

An object of the present invention is to provide a level meter 1111 device for an underground excavator that can easily and continuously measure the horizontal displacement of an underground excavator even when there are obstacles on the ground surface. .

(Means for Solving the Problems) The present invention utilizes a magnetic induction effect between a loop-shaped signal line laid along an excavation execution planning line and a magnetic coupling element provided at the tip of an underground excavator. A pair of measurement systems that measure the horizontal displacement of the underground excavator with respect to the line are placed across an obstacle on the ground surface in the excavation direction, and each measurement system is connected via a wireless line to ensure cooperation between each measurement system. The system is configured to measure the horizontal displacement of underground excavation along the excavation execution plan line including the section where obstacles exist due to movement.

(Function) Each measurement system measures the induced voltage generated by the magnetic induction effect between the loop-shaped signal line and the magnetic coupling element at the tip of the underground bending, and the induced voltage causes the horizontal displacement of the coverage area of the 8 systems. If the excavator is located below an obstacle on the ground surface, the excavator will work together to measure horizontal displacement by transmitting information via a wireless link.

(Example) FIG. 1 is a system configuration diagram showing an example of an underground excavation system to which the present invention is applied. A magnetic detection element 3 is installed near a pilot head 2 at the tip of an underground excavator 1. It is supported by a cardan frame 4 so as to always face vertically. The magnetic detection element 3 is connected to a processing device in the first operation 1!6a via a cable 5 inserted into the excavator 1, and is configured to detect an alternating magnetic field from the ground surface. Here, the excavator 1 is propelled by a propulsion jack 8 inserted into the starting shaft 7 in a direction from one end of the planned execution line to the other end. A loop-shaped signal line 9a is laid along a predetermined cutting line on the ground surface facing the excavation direction of the excavator 1, and an alternating current source in the operation panel 6a is connected to the signal line 9a. By applying an alternating current, a magnetic induction effect is generated between the magnetic field generated by the alternating current and the magnetic detection element 3, and the induced voltage generated thereby causes excavation 411 in the underground below the loop signal a9a. is configured to measure the horizontal displacement of.

On the other hand, there are rails 10 as obstacles on the ground surface in the excavation direction.
However, another loop-shaped signal line 9bS is laid along the Tsukuda execution line between the rail 10 and the reaching shaft 11 in front of the signal a9a. And this belief Pt
a 9 b are connected to the alternating current power source P in the second operation panel 6b, and a signal P is generated by the magnetic induction effect between the alternating magnetic field generated underground and the magnetic detection element 3 at the tip of the excavation R1.
The horizontal displacement of the excavation tF11 underground below the ia9b is configured to be detected by a processing device within the operation panel 6b.

FIG. 2 is a plan view of the signal lines 9a and 9b seen from the ground surface. It has a long direction along the execution plan line 12 or a hexagonal loop shape.

FIG. 3 is a block diagram showing an example of the internal configuration of the operation IJII 6a and 6b, and each operation panel has an oscillator 600.
and a power amplifier 601, and includes an alternating current source 60 that applies an alternating current to the signal lines 9a and 9b, and a transmitter/receiver 61 for transmitting and receiving signals such as measurement results between the operation panels. .

Here, the magnetic detection elements 3 include two detection elements 3a arranged in the excavation direction and a direction perpendicular to the excavation direction.

3b. The operation panel 6a on the starting shaft side has preamplifiers 62 and 63 that amplify the induced voltage generated in these magnetic sensing elements 3a and 3b, and the output voltages of these preamplifiers 62 and 63 are compared. A comparator 64 determines whether the displacement is in the left or right direction with respect to coasting % J-7, @12, and a signal of the comparison result is used to display "left displacement" and "left displacement" on the display 66.
A lighting circuit 65 for lighting an indicator light indicating "rightward displacement" is provided.

In the above configuration, drilling tO! 1 is working with an excavator underground below the signal IP39a, an alternating current is applied from the alternating current source 60 of the operation panel 6a to the signal line 9a. Then, an alternating magnetic field is generated in the direction underground from the signal line 9a, and the alternating magnetic field and the magnetic detection element 3a,
3b, a magnetic induction effect occurs.

The comparator 64 compares the induced voltages generated in the magnetic detection elements 3a and 3b, determines the horizontal displacement of the tip of the excavation In1, and displays the indicator 66 if the tip of the excavation In1 is displaced to the left with respect to the execution plan line 12. The "leftward displacement" indicator light is turned on, and if the vehicle is displaced to the right, the "rightward displacement" indicator light is turned on.

Furthermore, if the indicator exists directly below the execution plan line 12, both indicator lights are turned on (or are turned on).

After that, when the excavator 1 reaches below the rail 10,
The alternating magnetic field from the signal line 9a to the magnetic detection element 3 weakens, but once its strength reaches a certain value or less,
Transmission/reception 16 of the operation web from the transceiver 61 of the operation panel 6a
A signal for turning on the alternating current source 60 is transmitted for signal a9b, and an alternating current is applied for signal a9b. At the same time, the application of the alternating current to the signal line 9a is stopped, and the comparator 64 then determines the water level displacement based on the induced voltage generated in the magnetic detection element 3 by the alternating magnetic field from the signal line 9b, and displays the result on the indicator 66. Display the light.

As described above, even if there are obstacles on the ground surface, horizontal displacement for each excavation can be continuously measured.

By the way, although the embodiment shown in FIG. 1 has a configuration in which an alternating magnetic field is generated from a loop-shaped signal line and detected by a magnetic detection element at the tip of an underground excavator, these relationships may be reversed.

FIG. 4 is a block diagram showing one embodiment of the electric circuit in this case, in which a magnetic field generating element 15 is provided at the tip of the excavator 1, and an alternating current is applied from an alternating current source 60 on the operation panel 6a. As a result, an alternating magnetic field is generated toward the earth's surface. On the other hand, as shown in the plan view of FIG.
a, 17b and 18a, 18b are connected, and signals Fi17a and 17 are generated by the alternating magnetic field from the magnetic field generating element 15.
The left and right horizontal displacements are measured based on the difference between the induced voltages generated between the two electrodes 18a and 18b, and an indicator light indicating "leftward displacement" or "rightward displacement" is displayed based on the result.

In addition, also in this configuration, the horizontal displacement in the section below the obstacle is measured by the cooperation of the signals 117a and 17b and the signals PJ18a and 18b.

(Effects of the Invention) As explained above, according to the present invention, the loop-shaped signal line arranged in parallel along the excavation execution plan line and the magnetic field generation element or magnetic detection element provided at the tip of the underground excavator can be connected. The left and right horizontal displacement of the excavator is measured by using the induction effect between the
By providing a pair, the horizontal displacement of the excavator can be easily and systematically measured even when there are obstacles such as tram rails on the ground surface. Furthermore, by laying the loop signal line in close contact with the ground surface and covering it with a protective cover, it is possible to measure the level even on a road surface with a lot of traffic Q without blocking traffic.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of an underground excavation system to which the present invention is applied, Fig. 2 is a plan view of the loop-shaped signal line shown in Fig. 1 viewed from the ground surface, and Fig. 3 is the same as Fig. 1. 4 is a block diagram of an electric circuit showing another embodiment of the present invention, and FIG. 5 is a plan view of the loop-shaped signal line shown in FIG. 4 viewed from the ground surface. It is. 1... Underground excavator, 2... Pilot head, 3.
...Magnetic detection element, 6a, 6b...Operation panel, 7...
Starting shaft, 8... Propulsion jack, 9a, 9b, 17a,
17b. 18a, 18b...Loop-shaped signal @ line, 10...Rail, 12...Execution plan line, 15...Magnetic field generating element, 60...Alternating current source, 16...Signal processing circuit ,6
DESCRIPTION OF SYMBOLS 1...Transmitter/receiver, 64...Comparator, 65...Lighting circuit, 66...Display device. Figure 1 Figure 2 6'b Figure 3 One Figure 4 Figure 5

Claims (1)

[Claims] A device for measuring the horizontal displacement of an underground excavator underground, which uses magnetic induction between a loop-shaped signal line laid along the planned excavation line and a magnetic coupling element installed at the tip of the underground excavator. A pair of measurement systems that measure the horizontal displacement of an underground excavator with respect to the planned construction line are placed across an obstacle on the ground surface in the excavation direction, and each measurement system is connected via a wireless line. A horizontal displacement measuring device for an underground excavator, which is configured to measure the horizontal displacement of the underground excavator along an excavation execution plan line including a section where an obstacle exists through cooperation of a measurement system.