JPH0768851B2 - Shield machine joining or reaching position measuring method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shield machine joining or reaching position measuring method in a method of joining two shield machines in the ground or a method of making the shield machines reach a shaft, and a method thereof. Regarding the device.

[Prior Art] In order to better understand the present invention, the structure of a muddy water shield machine will be described as an example with reference to FIGS. 10 and 11.

In the figure, at the front of the cylindrical skin plate 1 of the shield machine A, a cutter disk 3 rotated by a drive device 2'is provided.
The disk 3 is provided with an outer peripheral cutter 4 and, in the example shown, four cutter heads 6 that mutually form slits 5. Behind the cutter head 6, a cutting face chamber 8 is defined by a bulkhead 7, and the cutting face chamber 8 includes a water supply pipe 9 for supplying pressurized mud water, and a mud pipe 10 for discharging drilling sludge and mud water. Is connected to the outside by. In addition, at the rear of the skin plate 1, there is a segment
An erector 12 for assembling 11 is provided, and a frame 13 of the erector 12 supports the other ends of a plurality of shield jacks 14 having one end attached to the bulkhead 7 side.

In such a structure, while the cutting face chamber 8 is being pressurized by the muddy water from the water supply pipe 9, the cutter head 6 is rotated to excavate the cutting face, the shield jack 14 is brought into contact with the existing segment 11, and is extended to shield the shield. The machine A is moved forward, and the drilling scrap and mud are discharged from the mud discharge pipe 10 to the outside. Then, after excavating for a predetermined distance, the shield jack 14 is contracted, the segment 11 is assembled in the rear space by the erector 12 and the primary lining is performed, and the secondary lining is performed between the segment 11 and the drilled hole by the segment or the like. Then, the shield jack 14 is extended and brought into contact with the segment 11 to perform the above-mentioned excavation.

When excavating a submarine tunnel from both ends by this shield machine, it is necessary to make the excavated holes coincide with each other at predetermined positions, and in order to do so, the relative positions of them must be measured accurately. Further, in order for the shield machine to reach a predetermined position on the shaft, the relative position between the shield machine and the shaft must be accurately measured.

Regarding this measuring method, JP-A-61-254793 and JP-A-62-288297 disclose that a boring pipe is extended from one shield machine or a vertical shaft, and a magnetic sensor provided at the tip of the pipe A technique has been disclosed in which a cutter disk of a shield machine is detected, and the detected waveform is compared with a detected waveform collected in advance to detect the position of a magnetic sensor to determine the relative position of both shield machines.

[Problems to be Solved by the Invention] The above-mentioned known techniques have the following problems.

That is, there is a case where the detection waveform collected in advance does not always match the waveform when the shield machine arrives due to wear and deformation of the cutter disk.

In addition, the waveform differs depending on the detection distance between the magnetic sensor and the cutter disk, which requires time for analysis and further causes an error.

In addition, to increase the measurement accuracy, decrease the detection distance,
It is necessary to use a magnetic sensor, but in this case, if the magnetic sensor is used while rotating the cutter disk, it may be damaged by the cutter disk.

INDUSTRIAL APPLICABILITY The present invention is a shield machine joining or reaching position measurement capable of measuring the relative position of both shield machines with high accuracy without measuring from the ground at a relatively distant position before the shield machines join or reach the shaft. It is an object to provide a method and an apparatus thereof.

[Means for Solving the Problems] According to the method of the present invention, the boring pipe is bored through the bulkhead or shaft wall of one shield machine to the other shield machine, and the tip of the boring pipe is drilled. The position is measured by a boring hole position measuring device,
A transmitting sensor is installed at the tip of the boring pipe, a plurality of receiving sensors are installed on the cutter disk of the other shield machine, and the other shield machine is dug to determine the relative distance between the cutter disk and the transmitter sensor. After reaching a predetermined value, the rotation angle from the base point of the cutter disk of the transmission sensor is obtained from the maximum output voltage of the reception sensor and the rotation angle of the signal transmitted from the transmission sensor in a non-contact manner. It is characterized in that the radial distance from the cutter disk center of the transmission sensor is obtained by the radial position of the maximum output voltage value of the.

According to the device of the present invention, a boring pipe extending from one shield machine or a vertical shaft, a boring hole position detecting device which is detachably provided on the boring pipe and detects a tip position thereof, and a boring pipe which is detachably provided on the boring pipe. And a plurality of receiving sensors mounted on the front surface of the cutter disk.

For the boring hole position measuring device, it is preferable to use a position detecting mirror and an optical surveying device attached to the tip of the boring pipe, but an inclinometer, a micro compass or an acceleration sensor can be used.

Moreover, it is preferable to use an electromagnet or a permanent magnet for the transmission sensor.

Further, it is preferable that the reception sensors use a magnetoresistive element or a Hall sensor and are arranged at equal pitches in one radial direction.

[Operation] In the shield machine joining or reaching position measuring method configured as described above, a plurality of reception sensors attached to the cutter disk of the shield machine facing the position of the transmission sensor are used, and the output voltage of the reception sensor is used. Non-contact detection is performed by obtaining the rotation angle from the base point of the cutter disk of the transmission sensor by the maximum value and rotation angle, and by obtaining the radial distance from the cutter disk center of the transmission sensor by the radial position of the maximum output voltage value. Since the shield machine does not need to be stopped for measurement, the position can be detected efficiently.

Also, by retracting the boring bar and the transmission sensor as the shield machine is advanced, it is possible to continuously detect and guide the position of the shield machine until joining or reaching. Can be made. In this case, the boring hole position measuring device is not always necessary.

Further, by combining with the automatic excavation system of the shield machine, the shield machine can be automatically joined or reached by an unmanned person.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a valve having a through hole (not shown) provided in the bulkhead 7 of one shield machine A that has reached a predetermined position first is opened to penetrate the boring pipe 20, and the other shield is opened. Bowl to aircraft B. Then, using the position detecting mirror 21 attached to the tip of the boring pipe 20, the tip position of the boring pipe 20 is measured by a boring hole position detecting device such as a known optical surveying instrument 22 provided in the shield machine A.

Next, as shown in FIGS. 2 and 3, a transmission sensor (for example, an electromagnet or a permanent magnet) 23 is attached to the tip of the boring pipe 20, and the rotary joint 2 of the shield machine B is attached.
An encoder, that is, an angle detector 24 is attached to the rotary shaft 2a (see FIGS. 10 and 11), and a plurality of (eight in FIG. 3) reception sensors (for example, magnetic resistance elements) are provided on the front surface of the cutter disk 3. Or Hall sensor) 25a to 25h (the reference numeral 25 will be used in the following collectively), and both 24,
25 is connected, for example, to a controller 26 equipped with a display 27 provided in an external office (Fig. 4). Then, excavate the shield machine B, and receive sensor 25 and angle detector.
24, the relative displacement between the transmission sensor 23 and the front surface of the cutter disk 3 is detected on the display screen 27 as shown in FIGS. 7 and 8 as follows.

FIG. 5 is a front view of the main part of the cutter disk 3 of the other shield machine B, and it is assumed that the transmission sensor 23 is at the position of the fourth reception sensor 25d from the inside as shown in the figure. Arrow A in the figure indicates the direction of rotation.

The receiving sensors 25a to 25h are located at a distance a from the center of the disk 3.
Are arranged at equal pitches b, and concentric circles C1 and C2 in FIGS. 5 and 6 indicate magnetic fields.

7 and 8 show the relationship between the rotation angle θ _S of the receiving sensor 25 from the base point P and the output voltage. Therefore, by determining the maximum output voltage,
The angle θ _S from the 23 origin is determined.

Further, as shown in FIG. 9, by measuring the output voltage of each of the receiving sensors 25a to 25h, the position of the maximum value of the output voltage becomes the position of the transmitting sensor 23 and the radial distance L from the center of the disk 3 is reached. (In the illustrated case, L = a + 3b) is obtained. Therefore, the position of the transmission sensor 23 is the angle θ _S from the base point of the cutter disk 3 and the distance L (=
a + 3b) is required. As a result, the other shield machine B
The direction of digging should be determined.

[Effects of the Invention] As described above, according to the present invention, if the cutter disk is provided with the reception sensor, the position of the shield machine can be reliably measured only by bringing the transmission sensor close to the cutter disk. Can reach a joint or a shaft.

[Brief description of drawings]

FIG. 1 and FIG. 2 are side views showing steps of detecting the tip position of a boring pipe and detecting a transmitting sensor by a receiving sensor of a cutter head, respectively. FIG. 3 is a front view of a cutter disk. FIG. 4 is a block diagram of a detection device using a reception sensor, FIGS. 5 and 6 are front and side views showing an example of the relative positions of the reception sensor and the transmission sensor of the cutter disk, and FIG. 7 is the position of the transmission sensor. FIG. 8 is a front view of the cutter disk for explaining the method of obtaining the relationship, FIG. 8 is a characteristic diagram showing the relationship between the output voltage of the receiving sensor and the rotation angle, and FIG. 9 is a relationship between the output voltage of the receiving sensor and the position in the radial direction. The characteristic diagrams shown in FIGS. 10, 10 and 11 are a side sectional view and a front view showing a conventional shield machine. A, B ... Shielding machine, 3 ... Cutter head, 20 ... Boring pipe, 21 ... Position detection mirror, 22 ... Optical measuring device, 23 ... Transmitting sensor, 24 ... Angle detector, 25 ...
Receiving sensor

Claims (2)

[Claims] 1. A boring pipe is bored through a bulkhead of one shield machine or a wall of a vertical shaft toward the other shield machine, and the tip position of the boring pipe is measured by a boring hole position measuring device. A transmitting sensor is installed at the tip of the boring pipe, a plurality of receiving sensors are installed on the cutter disk of the other shield machine, and the other shield machine is dug forward, and the relative distance between the cutter disk and the transmitter sensor is predetermined. After reaching the value, the signal transmitted from the transmission sensor in a non-contact manner is measured by the reception sensor, and the rotation angle from the base point of the cutter disk of the transmission sensor is obtained by the maximum output voltage of the reception sensor and the rotation angle. The radial distance from the cutter disk center of the transmission sensor can be calculated from the radial position of the maximum output voltage of the reception sensor. Shield machine bonding or arrival position measuring method characterized. 2. A boring pipe extending from one shield machine or a vertical shaft, a boring hole position detecting device which is detachably mounted on the boring pipe and detects a tip position of the boring pipe, and a transmission which is detachably mounted on the boring pipe. A shield machine joining or reaching position measuring device comprising a sensor, an angle detector provided on a rotary shaft of a rotary joint of the other shield machine, and a plurality of receiving sensors mounted on the front surface of the cutter disk.