JPS5855467B2 - Shield excavator position measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a position measuring device for measuring the excavation position of a shield tunneling machine or the like.

When a tunnel excavation machine excavates in a straight line, the route can be seen and easily measured, but subway and water tunnels that pass through urban areas pass under roads and are prone to bends in the road or at intersections. Therefore, determining the direction of tunnel excavation within a tunnel requires precise position measurement, which takes a long time.

In the present invention, a transmitter is installed on the ground above the tunnel excavation path of an excavator, and the vibration waves from each oscillator are detected by a receiver installed on the ground and a receiver installed in the underground excavator. The present invention provides a position measuring device that measures a tunnel excavation route by measuring transmission delay and arrival time delay.

An embodiment of the present invention will be described below based on the drawings.

In Fig. 1, IA and IB are transmitters that are made of electric motors or electromagnetic devices, and emit shock waves A and B with different natural vibrations at a small interval. It is placed on the road surface 2 on the side.

3A and 3B are placed near the installation locations of the transmitters IA and 1B, and transmit the shock waves A and 3B of the transmitters IA and IB, respectively.
Ground receivers 4A and 4B that receive shock waves A and B are underground receivers that are placed approximately in the center of the excavator 5 and similarly receive shock waves A and B from the transmitters IA and IB.

The ground receivers 3A and 3B are for detecting a delay in the transmission of the shock waves A and B which are emitted at a slight interval.

The underground receivers 4A and 4B are used to detect whether the excavation path is closer to the transmitter 1A or to the transmitter 1B due to the arrival time delay of the shock waves A and B from the transmitters IA and IB.
The deviation of the excavator 5 from the digging path is measured from the phase difference between the two delays.

The two shock waves AB are as shown in FIG. 2A and B, for example, and their transmission time delay δ and arrival time delay j can be obtained by detecting the difference in the peak times of the rise of both shock waves AB. .

FIG. 3 shows a block diagram, and 6-9 and 10-13 are amplifiers and noise removal filters of each receiver 3A, 3B, 4A, 4B.

The output of the filter 1011 is input to the first control section 14,
The transmission delay of shock waves A and B from the transmitters IA and IB is detected here.

The outputs of the filters 12 and 13 and the output of the first control section 14 are input to the second control section 15, where the arrival time delays of the shock waves A and H at the receivers 4A and 4B are detected, and the first control section It is compared with the transmission delay detected in section 14.

For example, suppose that shock wave B has a transmission delay of δA-H from shock wave A as shown in FIG. 2, and receiver 4A.

Shock wave B at 4B is larger than shock wave A, AA, B (
〉δ, if the time delay of B) is detected, the determination unit 16
determines that Horishinshinro 17 (Fig. 1) is closer to the transmitter side, and the receiver 4A.

Time delay of shock wave B with respect to shock wave A at 4B 'A −
B is smaller than the transmission delay δA-B (AA, B〈δA-B
), or conversely, if the shock wave A causes a time delay 'B, A than the shock wave B, the discriminator 16 determines whether the excavation is progressing or not.
is determined to be closer to the transmitter 1B side.

It is also possible to measure the distance between the transmitting point and the receiving point from the propagation time of the shock wave AB.

FIG. 4 shows an example of the arrangement of transmitters at bending points, where 20 is a digging path, 21 is an underground excavator, and 22A.

22B is a first pair of transmitters 23A arranged at equal intervals on both sides of the straight tunnel path 20a at the bending point.

Reference numeral 23B designates a second pair of transmitters arranged at equal intervals on both sides from the bending point in the direction of the straight excavation path 20a.

In this case, the excavator 21 on the straight excavation path 20a is the first
The deviation is corrected by the pair of oscillators 22A and 22B, and at the bending point, the second pair of oscillators 23A and 23B instruct the start of the bend, and thereafter on the curved excavation path 20b, the degree of curvature is corrected by the second pair of oscillators 23A and 23B. The appropriate deviation will be instructed.

In addition, in the case of a tunnel with complicated curves, the number of transmitting points is not limited to two (it can be used).

As described above, according to the present invention, since the position of the shield tunneling machine can be easily measured, deviations in the course of the shield tunneling machine can be easily discovered, and this can be quickly corrected. It is also possible to easily match the desired course.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an explanatory diagram showing the arrangement of a transmitter and a receiver, FIG. 2 AB is a waveform diagram showing the time delay of the emitted shock wave, and FIG. 3 is a block diagram Fourth
The figure is an explanatory diagram showing an example of the arrangement of transmitters at turning points of the route. IA, IB, 22A, 22B, 23A, 23B...
... Transmitter, 3A, 3B ... Ground receiver, 4A
. 4B...Underground receiver, 5,21...Shield excavator.

Claims (1)

[Claims] 1 A pair of transmitters arranged at least on both sides of the tunnel of the shield tunneling machine or on the front and rear sides of the tunnel in the direction of the tunnel, and emitting shock waves having different natural vibrations at a slight interval; a first pair of receivers that are placed near the installation location of the pair of transmitters and receive the respective shock waves;
a second pair of receivers arranged in the shield excavator to receive the respective shock waves; and detecting the slight emission interval of the shock waves from the outputs of the first pair of receivers;
a control unit that detects a time delay of the received shock wave from the output of the second pair of receivers, and measures the position of the shield excavator by comparing the time delay of the received shock wave with the slight firing interval. A shield tunneling machine position measuring device characterized by: