JPH0441895A - Tail clearance measurement device for shield tunneling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) This invention is used to measure the tail clearance of a shield excavator for measuring the gap (tail clearance) between the rear part of the shield main body and the segments assembled along the inner wall of the tunnel. Regarding equipment.

(Prior Art) When a conventional shield excavator excavates a tunnel, each time the shield body excavates one pitch, a segment is assembled along the inner wall of the tunnel excavated by the shield body.

Conventionally, this segment is assembled using a segment erector, but if the center of the shield body is eccentric to the center of the already assembled segment, the tail clearance between the rear of the shield body and the segment will be constant. When assembling the two segments without doing so, there were cases where the segment interfered with the skin plate of the shield body, making it difficult to assemble the segments.

Particularly in the case of curved construction where the shield body is excavated along a curve, it is easy to order eccentricity between the existing segments and the shield body.

For this reason, various methods and devices for measuring tail clearance have been proposed in the past.

For example, JP-A-63-315797, JP-A-62-20
No. 6195, JP-A-62-206196, JP-A-63
-265098.

Unexamined Japanese Patent Publication No. 171491/1983, Unexamined Japanese Patent Publication No. 1-138989
No., Utility Model Application Publication No. 1-138990, etc.

(Problems to be Solved by the Invention) However, each method and device has problems such as the measurement method or device being complicated or not being able to perform highly accurate measurements.

The present invention has been made to solve these problems, and it is an object of the present invention to provide a tail clearance measuring device for a shield tunneling machine that can measure the tail clearance with high accuracy.

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention includes a contactor that comes into contact with the end face of the existing segment and the inner surface of the skin plate of the shield body, respectively, in the shield body that excavates underground. A plurality of measurement jigs are provided in the circumferential direction, and these measurement jigs include
A distance sensor is provided to measure the distance to the inner peripheral surface of the segment.

As a result, the tail clearance can be directly measured at multiple locations in the circumferential direction of the shield body using a distance sensor, and the eccentricity between the shield body and the segment can be calculated from the obtained tail clearance, and this eccentricity can be reduced. By controlling the direction of the shield body in this manner, it becomes possible to maintain a constant tail clearance.

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

In the figure, reference numeral 1 denotes a shield main body, which is propelled underground by a shield jack 2. At the front of the shield main body 1, a canter head 4 is provided which is rotatably driven by a seven-stroke motor 3.

The earth and sand excavated by the cutter hand 4 is taken into the chamber 1a from an earth and sand intake port (not shown), and is then made into a slurry by water injected from the water pipe 5, and further into the slurry drain pipe 6.
This allows the liquid to be discharged to the rear of the shield body 1.

Further, 7 is a segment erector for assembling segments 8 along the inner wall of the tunnel excavated by the shield body 1;
Reference numeral 10 denotes a tail clearance measuring device for measuring the tail clearance C between the outer circumferential surface of the assembled segment 8 and the inner circumferential surface of the skin plate 1b of the shield body (2).

The tail clearance measuring device 10 is installed at a plurality of locations in the circumferential direction so as to be located between the shield jacks 2, and has a measuring cylinder 11 as shown in FIG.

A measuring jig 12 is fixed to the tip of the piston rod 11a that protrudes rearward from the measuring cylinder 11, and segments 8
Contactors 12a and 12b made of balls or rollers are provided which contact the end face of the skin plate lb and the inner circumferential face of the skin plate lb, respectively.

A distance sensor 3 such as a laser type or an ultrasonic type for measuring the distance X to the inner circumferential surface of the segment 8 is attached to a bracket 12c that projects rearward from the inner surface of the measuring jig 12.

Note that 14 in the figure indicates a tail seal.

Next, to explain the operation, when measuring the tail clearance C between the inner circumferential surface of the skin plate b of the shield body 1 and the outer circumferential surface of the already assembled segment 8, multiple locations are provided in the circumferential direction of the shield body 10. The measuring cylinder 11 is extended and the contacts 12a and 12b of the measuring jig 12 provided at the tip of the piston rod 11a are attached to the end surface of the segment 8 and the inner circumferential surface of the skin plate 1b, respectively, as shown in FIG. so that they touch each other.

In this state, the distance sensor 13 measures the distance 11x to the inner peripheral surface of the segment 8.

Since the distance Jlly from the inner surface of the skin plate 1b to the distance sensor 13 and the wall thickness B of the segment 8 used are known, the tail clearance C is calculated from the measured distance X to the inner peripheral surface of the segment 8 by -1 at each position. -114, the average value of these tail clearances 01 to C4 is calculated.

C= 'A (C+ + Ct + C3+ Ca
) Then, the eccentricities e, I, and ea between the center of the shield body 1 and the center of the segment 8 are determined.

The horizontal eccentricity of the shield body 1 is 8.

ex = 'A (l eytl
+l eX□ 1) where eXl≧0
When , the shield body 1 is eccentric to the right, and when <0, it is eccentric to the left.

Similarly, the vertical eccentricity e of the shield body 1 is:

e-=! 4(Ie a+l + l ey
tl) Here, when all+≧0, the shield body 1 is eccentric upward, and when eA, ku0, it is eccentric downward.

, °, the eccentricity e is calculated as e=ex''+e% or more, and the existing segment 8
Since it is possible to determine in which direction the shield body 1 is eccentric with respect to the eccentricity, by correcting the direction of the shield body 1 to correct this eccentricity, the tail clearance C between the shield body 1 and the segment 8 can be adjusted. It can be kept constant.

In addition, if the amount of eccentricity eyo+eF in the vertical and horizontal directions is determined and compared for each time, and the amount of change over the course of 8 hours is ascertained, the inclination of the shield body 1 and the segment 8 can also be detected.

(Effects of the Invention) As described in detail above, the present invention makes measurements by bringing the contacts of the measuring jig provided at multiple locations in the circumferential direction of the shield body into contact with the end face of the segment and the inner circumferential face of the skin plate. By measuring the distance to the inner peripheral surface of the segment with a distance sensor installed on the jig, the amount of eccentricity between the shield body and the segment can be determined. By controlling the shield body so that this amount of eccentricity is reduced, It is possible to maintain a constant tail clearance.

This eliminates problems such as the segment interfering with the skin plate of the shield body, making it difficult to assemble the segment, and also allows the tail clearance to be measured using a distance sensor installed in the measurement jig.
Compared to conventional tail clearance measuring methods and measuring devices, it is possible to measure tail clearance more easily and accurately.

In addition, since the amount of eccentricity can be measured continuously, the inclination of the shield body and segments can also be determined, and by correcting the direction of the shield body based on the obtained data, highly accurate tunnel excavation can be carried out along the construction plan line. is also possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an enlarged view of the tail clearance measuring device, FIG. 2 is a sectional view of the shield tunneling machine, and FIG. 3 is an explanation of the operation. ■...Shield body 1b...Skin plate 8
...Segment 12...Measuring jig 12a, 12
b - Contact 13... Distance sensor

Claims (1)

[Claims] The existing segment 8 is installed inside the shield body 1 that excavates underground.
on the end face and the inner surface of the skin plate 1b of the shield body 1,
A plurality of measurement jigs 12 each having contacts 12a and 12b in contact with each other are provided at a plurality of locations in the circumferential direction, and these measurement jigs 12 are provided with a distance sensor 13 for measuring the distance to the inner peripheral surface of the segment 8. Tail clearance measurement device for shield tunneling machines.