JPH06307189A - Measuring method for driving depth of underground driving machine - Google Patents

Abstract

PURPOSE:To enable the measurement of driving depth by emitting electromagnetic waves from the main body of an underground driving machine toward the ground surface side, receiving reflected waves from the field surface between the ground surface or pavement surface and atmosphere, and processing the signals. CONSTITUTION:A transmitting antenna 7 and a receiving antenna 8 are installed on the upper part of a main body case 4 of an underground driving machine 3, A radar controller, transmitting and receiving circuits, signal processing section and data recording section are stored in the main body case 4. Electromagnetic waves are emitted toward the ground surface side from the transmitting circuit through the transmitting antenna 7 by control of the ladar controller. Electromagnetic waves reflected by difference in dielectric constant of the field surface between the surface of a paving layer 1 or the ground surface and atmosphere are received by the receiving circuit through the transmitting antenna 8, they are processed by the signal processing section to obtain a driving depth signal, it is recorded in the data recording section, and driving depth required to be driven is calculated, and driving depth is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion depth measuring method for an underground propulsion device for measuring the propulsion depth when the underground propulsion device propels the ground.

[0002]

2. Description of the Related Art Conventionally, when an underground propulsion machine is used to bury a cable in the ground without cutting, for example, the propulsion depth is measured by emitting an electromagnetic wave from the ground directly above the underground propulsion machine. However, the propulsion depth of the underground propulsion device is measured by capturing the reflected wave from the underground propulsion device.

[0003]

By the way, electromagnetic waves tend to be easily reflected at the interfaces of substances having different dielectric constants. Electromagnetic waves emitted from the ground are reflected by the ground propulsion device and captured on the ground.For example, when the pavement layer is provided on the ground surface, the atmosphere and the pavement surface, the pavement back surface and soil, the soil and the propulsion device It is reflected at each interface between the soil and the backside of the pavement, the surface of the pavement and the atmosphere, and when the pavement layer has reinforcing bars or the soil contains a large amount of gravel, it scatters while passing through it. However, when the reflected wave from the underground propulsion device is weak, or when the projected area of the underground propulsion device is small, electromagnetic waves cannot be captured well and the propulsion depth may not be measured.

It is an object of the present invention to provide a propulsion depth measuring method for an underground propulsion device which can catch electromagnetic waves well and measure the propulsion depth without using any special equipment.

[0005]

Means for Solving the Problems To explain the means of the present invention for achieving the above object, the present invention is directed to propulsion of an underground propulsion device for measuring the propulsion depth when the underground propulsion device propels the ground. In the depth measurement method, an electromagnetic wave is emitted from the underground propulsion device in the ground, and the propulsion depth of the underground propulsion device is measured by capturing a reflected wave from the ground surface or pavement surface with the underground propulsion device. It is characterized by doing.

[0006]

When electromagnetic waves are emitted from an underground propulsion device in this way, electromagnetic waves are likely to be reflected at the interface between the ground surface or pavement surface and the atmosphere due to the difference in dielectric constant, and the ground surface or pavement surface is also reflected. The large area makes it easy to catch reflected waves.

[0007]

1 and 2 show an embodiment of an apparatus for carrying out the method for measuring the propulsion depth of an underground propulsion machine according to the present invention. In the figure, 1 is a pavement layer provided on the ground surface, 2 is a reinforcing bar provided in the pavement layer 1, 3 is an underground propulsion device for propelling the ground, 4 is a main body case of the underground propulsion device 3. ,
Reference numeral 5 denotes a propulsion head portion which has a tapered surface 5a at the front end thereof and which is provided at the front end of the main body case 4 to change the propulsion direction by being rotated around an axis 5b.
A propulsion pipe (or an embedding pipe) that is connected to the rear part and transmits a propulsive force by pressing, 7 and 8 are transmission antennas and reception antennas provided on the upper part of the main body case 4, and 9 is a transmission signal to the transmission antenna 7. A transmitting circuit for transmitting a reflected wave via a receiving antenna 8, a radar controller 11 for controlling the transmitting circuit 9 and the receiving circuit 10, a battery 12 for supplying power to the radar controller 11 and the like, a radar controller 13 A signal processing unit that processes the transmission start signal from 11 and the reception signal from the receiving circuit 10 to obtain a propulsion depth signal, 14 is a battery that supplies power to the signal processing unit 13 and the like, and 15 is processed by the signal processing unit 13. A data recording unit for recording data, 16 is a signal from the signal processing unit 13, and controls the rotation angle of the propulsion head unit 5 to control the propulsion depth. A control unit.

Next, a propulsion depth measuring method for an underground propulsion device according to this embodiment using such a device will be described.
Radar controller 1 in the ground propulsion unit 3 existing in the ground
Under the control of 1, the transmission signal is emitted from the transmission circuit 9 via the transmission antenna 7 as an electromagnetic wave. In this way, the electromagnetic waves emitted from the underground propulsion device 3 travel toward the surface of the earth,
The electromagnetic waves are reflected at the interface between the pavement surface of the pavement layer 1 for paving the ground surface and the atmosphere due to the difference in dielectric constant. The reflected wave passes through the receiving antenna 8 of the underground propulsion device 3 and the receiving circuit 1
Received with 0. At this time, since the pavement surface has a large reflection area, it is easy to catch the reflected wave.

The radar controller 11 receives the transmission start signal and the reception signal from the reception circuit 10 and outputs them to the signal processing unit 13.
Send to. The signal processor 13 processes these signals to obtain a propulsion depth signal. The obtained propulsion depth signal is recorded in the data recording unit 15. The signal processing unit 13 calculates the propulsion depth to be propelled next based on the obtained propulsion depth signal, sends a signal to the propulsion head unit 5, and controls the rotation angle of the propulsion head unit 5. Control propulsion depth.

In this way, the propulsion depth of the underground propulsion unit 3 is measured by, for example, road management when a conduit for electricity, gas, communication, etc. is buried under a road (roadway, sidewalk). This is because the person is obliged to bury it more than the specified depth. For example, if a power pipeline is buried under a national road, it must be buried at least 1.5 m. Therefore,
When the underground propulsion device 3 is used to bury a pipe or the like, it is necessary to measure the propulsion depth of the underground propulsion device 3 and perform control so that the underground propulsion device 3 is always buried at a predetermined depth or more. In particular, according to the present invention, the propulsion depth can be measured by properly capturing electromagnetic waves without using a special device.

In the above embodiment, the case where the pavement layer 1 is present on the ground surface has been described, but when the pavement layer 1 is not present, the reflected wave generated on the ground surface which is the boundary with the atmosphere is captured. Measure the propulsion depth.

[0012]

As described above, the propulsion depth measuring method for an underground propulsion device according to the present invention emits electromagnetic waves from the underground propulsion device in the ground, so that the interface between the ground surface or pavement surface and the atmosphere. Then, the electromagnetic wave is easily reflected due to the difference in the dielectric constant, and since the ground surface or the pavement surface has a large reflection area, the reflected wave can be easily captured. In addition, compared to the path when emitting electromagnetic waves from the ground to the ground (for example, transmitting antenna-atmosphere-pavement layer-underground-reflection by ground propulsion-underground-pavement layer-atmosphere-reception antenna). In the case of emitting electromagnetic waves from the ground as in the present invention, the path (for example, transmitting antenna-underground-reflection on the pavement surface-underground-receiving antenna) has less transmission layer and loss due to reflection of electromagnetic waves. Has the advantage of being less.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of an implementation state of a propulsion depth measuring method for an underground propulsion device according to the present invention.

FIG. 2 is a block diagram showing a circuit configuration in the underground propulsion device of the present embodiment.

[Explanation of symbols]

 1 Pavement Layer 2 Reinforcing Bar 3 Underground Propulsion Machine 4 Body Case 5 Propulsion Head 5a Tapered Surface 5b Shaft Center 6 Propulsion Pipe 7 Transmitting Antenna 8 Receiving Antenna 9 Transmitting Circuit 10 Receiving Circuit 11 Radar Controller 12 Battery 13 Signal Processing Unit 14 Battery 15 Data recording unit 16 Propulsion depth control unit

Claims (1)

[Claims] 1. A method for measuring a propulsion depth of an underground propulsion device for measuring the propulsion depth when an underground propulsion device propels the ground, wherein an electromagnetic wave is emitted from the underground propulsion device, A propulsion depth measuring method for an underground propulsion device, which comprises measuring a propulsion depth of the underground propulsion device by capturing a reflected wave from a surface or a pavement surface with the underground propulsion device.