JPH0468192A - How to detect the position of a shield tunneling machine - Google Patents

Abstract

PURPOSE:To increase the degree of accuracy of measurement by using transmitting coils provided to a shield excavator to generate a magnetic field and a receiving sensor suspended to a measuring hoe bored in the direction of the excavator to detect the slippage. CONSTITUTION:Grid-transmitting coils 4 are provided to the peripheral surface of the upper part of a shield excavator 1, and a receiving sensor 6 is suspended to a measuring hole 10 bored in the direction of the excavator 1 perpendicularly from the ground. After that, an AC power supply 5 is applied to the transmitting coils 4 to generate the magnetic field, it is received by the receiving coil 6, the slippage delta is calculated from the difference of the value of induced electromotive force generated in reiving coils 6a and 6b in accordance with the slippage deltaof the center 01 of the sensor 6 against the center 0 of the coil 4, and a position of the excavator 1 is measured. According to the constitution, high degree of accuracy of position detection can be made.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for detecting the position of a shield excavator that excavates underground.

(Prior Art) Conventional shield tunneling machines that excavate underground tunnels, etc. need to constantly detect their position in order to know whether they are excavating accurately along the planned line of the tunnel, etc.

Conventionally, as a method for detecting the position of a shield tunneling machine, a method has generally been adopted in which a surveying instrument such as a transit is provided in a single-launch shaft, and measurement is performed using this surveying instrument.

Another method is the check polling method, in which a measurement hole is drilled from the ground toward the existing segment, a surveying instrument is hung into the measurement hole, and the position is detected by confirming the position both on the ground and in the tunnel. etc. have also been adopted.

(Problem to be solved by the invention) However, with the former method, measurements cannot be made if the tunnel is excavated along a curve, and measurement errors accumulate when excavating over a long distance.

There were problems such as the inability to perform highly accurate measurements.

Furthermore, in the latter check polling method, it is necessary to drill through holes in the segments lining the inner wall of the tunnel, which causes problems such as water leakage and a decrease in the strength of the segments.

This invention was made for the purpose of solving the above-mentioned problems, and it is a shield excavator that has no errors even when excavating over long distances, and enables position detection without drilling through holes in segments. The aim is to provide a detection method.

(Means and effects for solving the problem) In order to achieve the above object, the present invention provides a shield excavator that excavates underground with a transmitting coil that generates a magnetic field, and transmits a magnetic field from the ground toward the shield excavator. A receiving sensor that receives the magnetic field is suspended in the drilled measurement hole, and from the difference in the induced electromotive force generated in the plurality of receiving coils provided in the receiving sensor,
The position of the shield excavator is detected based on the amount of deviation between the transmitting coil and the receiving sensor.

This prevents errors from accumulating even when excavating over long distances, making it possible to detect positions with high precision.There is also no need to drill measurement holes that penetrate through the segments, so measurements can be carried out safely. .

(Example) An embodiment of the method of this invention will be described in detail with reference to the drawings.

Figure 1 shows the shield excavator 1 excavating underground.The shield excavator 1 is propelled underground using the segment 2 lining the inner wall of an already excavated tunnel as a foothold, and the front part of the shield excavator 1 is The cutter head 3 provided excavates the face in front of the shield excavator 1, and the earth and sand excavated by the cutter head 3 is taken into the shield excavator 1 and then carried out to the rear by an earth removal device (not shown). It is now possible to do so.

Also, on the outer circumferential surface of the second part of the shield excavator 1, there is a transmitting coil 4.
are arranged in a grid pattern.

As shown in FIG. 2, the transmitting coil 4 has a concave stepped portion 1b formed on the outer circumferential surface of the shield tunneling machine 1 (skin play) 1a, and a concave stepped portion 1b is formed in the four stepped portions Ib in the direction of propulsion of the shield tunneling machine 1 and perpendicular thereto. The transmitter coil 4 is arranged in a grid pattern in the direction of the shield, and the opening of the four-stage section 1b is made of a non-magnetic plate 1c made of temporary stainless steel so that it is flush with the outer peripheral surface of the shield excavator 1. It's blocked.

Then, an AC power source 5 is applied to the transmitting coil 4, generating a magnetic field as shown in Fig. 3. This magnetic field is received by a receiving sensor 6 suspended from the ground. It is supposed to be done.

As shown in FIG. 4, the receiving sensor 6 has two receiving coils 6a61 tilted at 45° with a perpendicular line in between, and the angle of the axes of these receiving coils 6a and 6b is 90°.
° is set.

The induced electromotive force generated in these receiving coils 6a and 6b is amplified by an isolation amplifier 7, then sent to the ground, and input to a measuring device 9 consisting of a microcomputer via a Ronfin amplifier 8 installed on the ground. It is now possible to do so.

r) Next, a method of detecting the position of the shield tunneling machine 1 will be explained with reference to FIG. In detecting the position of the shield excavator 1 that is digging underground, a measurement hole 10 is first drilled vertically toward the shield excavator 1 from the ground.

This measurement hole 10 only needs to reach the vicinity of the transmitting coil 4 provided in the shield tunneling machine 1, and there is no need to penetrate the segment 2 as in the conventional case.

Next, the reception sensor 6 is suspended from the ground in the measurement hole 10, and as shown in FIG.

That is, when the two receiving coils 6a6b arranged at an angle of 90 degrees receive the magnetic field generated by the transmitting coil 4, an induced electromotive force is generated in the two receiving coils 6a and 6b.

When the center 01 of the receiving sensor 6 and the center 0 of the transmitting coil 4 coincide, the induced electromotive force value generated in each receiving coil 6a6b is equal; 01, as shown in FIG. 3, a difference occurs in the induced electromotive force values generated in the receiving coils 6a and 6b depending on the amount of deviation δ.

The induced electromotive force generated in these receiving coils 6a and 6b is amplified by an isolation amplifier 7, and then sent to the ground and input into a measuring device 9. The measuring device 9 determines the amount of deviation δ between the center 01 of the receiving sensor 6 and the center O of the transmitting coil 4 from the difference between the induced electromotive force values input from the receiving coils 6a and 6b.
is calculated, and the position of the shield excavator 1 is measured based on the amount of deviation δ.

In addition, as the shield tunneling machine 1 excavates, survey holes 10 are drilled one after another as shown in Fig. 1, and by detecting the position of the shield tunneling machine 1 in the same manner as above, the position of the shield tunneling machine 1 is detected along the planned line of the tunnel. This enables accurate excavation.

(Effects of the Invention) As described in detail above, the present invention provides a shield tunneling machine that excavates underground with a transmitting coil that generates a magnetic field, and installs the transmitting coil in a measurement hole drilled from the ground toward the shield tunneling machine. The position of the shield excavator is determined by suspending a receiving sensor that receives the magnetic field generated by the shield machine, and calculating the amount of deviation between the transmitting coil and the receiving sensor from the difference in induced electromotive force values generated in multiple coils installed on the receiving sensor. ff is detected, and since the transmitting coil provided on the shield excavator is directly detected, errors do not accumulate even during long-distance excavation, so highly accurate measurement is possible.

Furthermore, since there is no need to drill a measurement hole that penetrates the existing segment, it is possible to safely detect the position of the shield tunneling machine without water leakage or reducing the strength of the segment.

[Brief explanation of the drawing]

The drawings show an embodiment of the method of the present invention; FIG. 1 is an explanatory diagram showing a measurement state, FIG. 2 is a sectional view of a transmitting coil, FIG. 3 is an explanatory diagram of a receiving state, and FIG. 4 is an explanatory diagram of a receiving coil. It is a layout diagram. 1... Shield tunneling machine 4... Transmission coil 6...
- Receiving sensors 6a, 6b... Receiving coil 10... Measuring hole δ... Displacement amount Patent applicant Komatsu Ltd. Representative (patent attorney) Osamu Matsuzawa (one idiot) Figure

Claims (1)

[Claims] A transmitter coil 4 that generates a magnetic field is provided on a shield excavator 1 that excavates underground, and a receiving sensor 6 that receives the magnetic field is suspended in a measurement hole 10 drilled from the ground toward the shield excavator 1. In addition, the position of the shield excavator 1 can be detected from the difference in induced electromotive force values generated between the plurality of receiving coils 6a and 6b provided in the receiving sensor 6, and from the deviation amount δ between the transmitting coil 4 and the receiving sensor 6. Characteristic method for detecting the position of a shield tunneling machine.