JPH03251788A - Apparatus for measuring position of shield excavator - Google Patents

Abstract

PURPOSE:To accurately measure the position of an excavator from a pit by propelling a pilot pipe toward the shield excavator from the pit and receiving the magnetic field emitted from the transmission coil in the pipe by the sensor in the excavator. CONSTITUTION:A non-magnetic pilot pipe 4 such as a stainless steel pipe is propelled to a shield excavator excavating the ground from a pit 2 and an AC power supply 7 is applied to the transmission coil 6 in the pipe 4 to generate a magnetic field. When this magnetic field is received by two receiving sensors 8 in the excavator 1, electromotive force becoming large as approaching the transmission coil 6 is generated. This electromotive force is sent to the measuring apparatus main body on the side of the pit and the relative distance in the axial direction from the transmission coil 6 to the excavator is calculated to measure the position of the excavator 1 in the left-and-right direction. In this case, there is no accumulation of a measuring error as compared with a case measuring a position visually or by laser beam and a position can be measured even in the basement of a building.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a position measuring device for a shield excavator that measures the position of a shield excavator digging underground from a shaft.

(Conventional technology) Conventionally, when excavating tunnels underground or burying underground pipes, shield excavators are often used. It is necessary to measure whether excavation is being carried out accurately along the planned line.

Conventionally, this measurement has been done using a measuring device installed behind the shield tunneling machine, and measuring visually or optically using laser light, or by polling the shield tunneling machine from the ground. I was checking the location of the excavator.

(Problem to be solved by the invention) However, with the former method of visually or optically measuring from the rear of the shield excavator, when excavating a long distance, the measurement accuracy is poor because the errors that occur each time are accumulated. There is a low defect.

In addition, the latter method of confirming the position of the shield tunneling machine by polling had problems such as difficulty in measuring the position if there were architectural structures on the ground or at great depths.

This invention was made to improve the above-mentioned conventional problems, and it is an object of the present invention to provide a shield tunnel line position measuring device that allows the position of a shield tunnel machine to be easily measured from a shaft.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention propels a pilot pipe from a shaft toward a shield excavator that excavates underground, and a transmitting coil provided in the pilot pipe. Generate more magnetic field,
By detecting this magnetic field with receiving sensors installed in multiple locations inside the shield tunneling machine, the position of the shield tunneling machine can be measured. Even if objects are present, the position of the shield excavator can be accurately measured even when excavating at great depths.

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

In the figure, 1 is a shield excavator that excavates underground from a starting shaft (not shown) toward a destination shaft 2, and has a canter head 3 at the tip. After being taken into the machine 1, it is carried out to the rear of the shield excavator by an earth and sand conveying device (not shown).

Further, 4 is a pilot tube with a pilot head 5 attached to its tip, which is made of a non-magnetic tube such as a stainless steel tube, and is propelled parallel to the planned line on which the shield excavation III excavates, and transmits information into the pilot tube 4. A coil 6 is wired.

Two transmitter coils 6 are wired inside the pilot pipe 4, one end of which is connected to the other within the pilot pipe 4, and the other end extended from the pilot pipe 4 into the reaching shaft 2. An AC power source 7 is applied between these transmitting coils 6.

Further, one side of the transmitting coil 6 in the pilot tube 4 (the side shown by the broken line in FIG. 1) is magnetically shielded so that the generated magnetic fields do not cancel each other out.

A magnetic field is generated only from the other transmitting coil 6.

On the other hand, on the inside upper part of the shield excavator 1, receiving sensors 8 are provided at two locations spaced apart in the left and right direction, and these receiving sensors 8 detect the magnetic field emitted from the transmitting coil 6. .

The signals detected by these receiving sensors 8 are sent to a measuring device body (not shown) installed in the starting shaft, so that the position of the shield excavator 1 is measured.

Next, to explain the operation, when measuring the position of the shield tunneling machine l that excavates underground, first the pilot tube 4 is propelled upward from the reaching shaft 2 to the upper part of the shield tunneling machine l, and these pyro・2 When the pipe 4 reaches the vicinity of the shield tunneling machine l.

An AC power source 7 is applied to a transmitting coil 6 that has been wired in the pilot tube 4 in advance, and a magnetic field is generated from the transmitting coil 6.

This magnetic field is then received by two receiving sensors 8 provided within the shield tunneling machine 1.

The closer the receiving sensor 8 is to the transmitting coil 6, the greater the electromotive force it generates.

The electromotive force induced in each receiving sensor 8 is sent as a detection signal to the main body of the measuring device installed on the starting shaft side, and the electromotive force is compared. The distance is calculated, and the position of the shield tunneling machine 1 in the left and right direction can be measured.

Although the above embodiment measures the position of the shield tunneling machine 1 in the horizontal direction, the receiving sensors 8 are installed within the shield tunneling machine 1 spaced apart in the vertical direction.

By detecting the transmitting coil 6 in the pilot tube 4 propelled in the horizontal direction of the shield tunneling machine 1, it is also possible to detect the position of the shield tunneling machine 1 in the vertical direction.

(Effects of the Invention) As detailed above, this invention propels pilot pipes from a shaft toward a shield tunneling machine that excavates underground, generates magnetic fields from transmitting coils installed in these pilot pipes, and transmits these By receiving the magnetic field emitted by the coil with multiple receiving sensors installed on the shield machine, the position of the shield machine during excavation can be measured accurately from inside the shaft, making it easier to visually observe and measure the position of the machine while it is digging. Compared to optical measurements using laser light, etc., measurement errors do not accumulate even when excavating long distances.

This makes it possible to measure with high precision, and since measurements are taken from inside a shaft, it is possible to measure the position of the shield machine even when there are building structures on the ground or when excavating at great depths.

In addition, since the position can be measured continuously and in real time while excavating, the measurement results can be fed back to the excavation structure, and there is no need to stop excavation even during measurement, which improves excavation efficiency.

[Brief explanation of drawings]

The drawings show one embodiment of the invention, and FIG. 1 is a cross-sectional view;
2 is a longitudinal cross-sectional view, FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 2, and FIG. 4 is an enlarged view of the portion ■ in FIG. 3. 1... Shield excavator 4... Pilot tube 6... Transmission coil 8... Receiving sensor

Claims (1)

[Claims] A pilot pipe 4 is propelled from a shaft toward the shield excavator 1 that excavates underground, and a magnetic field is generated from a transmitting coil 6 provided in the pilot pipe 4, and this magnetic field is transmitted to multiple locations inside the shield excavator 1. A position measuring device for a shield excavator, characterized in that the position of the shield excavator is measured by detecting the position with a receiving sensor 8 provided at a location.