JPH0441894A - Measuring device for tail clearance of shield excavator - Google Patents

Abstract

PURPOSE:To correct the direction of a shield body and improve the excavating accuracy by measuring the tail clearance directly with a sensor provided in plural places inside the shield body to measure the distance from the inside circumference surface of the skin plate of a shield body to the outside circumference surface of a segment. CONSTITUTION:A distance sensor 11 provided in plural places along a shield body 1 in the circumference direction measures the distance up to the outside circumference surface of an existing segment 8 as a tail clearance C1. The amount of eccentricity ex, ey between the center of the shield body 1 and the center of the segment 8 is found. Upon calculating the eccentricity amount (e) using the value and judging the direction of eccentricity of the shield body 1 in contrast to the existing segment 8, correction is made to the direction of the shield body 1. The tail clearance between the shield body 1 and segment 8 is then kept constant. A tunnel excavation with high accuracy in compliance with the construction scheme can thus be realized.

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 tunnel is excavated by a conventional shield excavator, a segment is assembled along the inner wall of the tunnel excavated by the shield body every time the shield body excavates one pinch.

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. However, when assembling the segments, there were cases where the segments 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, eccentricity between the existing segment and the shield body is likely to occur.

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
6195 JP-A-62-206196, JP-A-63-2
65098 No. 1 Japanese Unexamined Patent Publication No. 171491/1986, Utility Model No. 1
-138989, 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 easily and accurately measure the tail clearance.

Means and operation for solving CtJ, B) In order to achieve the above object, the present invention measures the distance from the inner peripheral surface of the skin plate to the outer peripheral surface of the segment in the skin plate of the shield body that excavates underground. Distance sensors are provided at multiple locations in the circumferential direction.

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 seal jack 2, and a cutter head 4 rotatably driven by a canter head motor 3 is provided at the front of the shield main body 1.

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

7 is a segment erector for assembling the segment 8 along the inner wall of the tunnel excavated by the shield body I;
Reference numeral 10 denotes a tail clearance measuring device that measures the tail clearance C between the outer peripheral surface of the assembled segment 8 and the inner peripheral surface of the skin plate 1b of the shield body 1.

The above tail clearance measuring device! Reference numeral 10 indicates a distance sensor 11 such as a laser type or an ultrasonic type that is provided at multiple locations in the circumferential direction within the skin plate Ib of the shield body 1. The tail clearance C can be directly measured from the distance to the outer peripheral surface of the tail.

In the figure, 12 is a cover that protects the lead wire 13 extending from the distance sensor 11, and 14 is a tail seal.

Next, to explain the operation, the distance sensor 11 provided at multiple locations (for example, four locations) in the circumferential direction of the shield body l measures the distance to the outer peripheral surface of the existing segment 8 as the tail clearance c, cmCs, Ca. , the average 4MC of these tail clearances C2 to CJ is calculated.

C='A (C+ +Cx +Cx +Ca) Then, the eccentricity e, , ea between the center of the shield body 1 and the center of the segment 8 is determined.

The horizontal eccentricity e8 of the shield body 1 is.

ex = 'A (l ex+: +
l ext l) Here, when elI+≧00, the shield body l is eccentric to the right, and when e□<0, it is eccentric to the left.

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

e, −each (t ey+ l ” le
yzl) Here, when ey+≧0, the shield body 1 is eccentric upward, and when e□<0, it is eccentric downward.

,゛,The eccentricity e is e=e-+e,'' By calculating the eccentricity e in the above manner, 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 @I+e in the vertical and horizontal directions is determined and compared at each hour, and the amount of change due to one hour of use is determined, it is possible to detect the inclination of the shield body 1 and the segment 8. .

(Effects of the Invention) As described in detail above, the present invention provides distance sensors at multiple locations in the circumferential direction within the skin plate of the shield main body, and uses these distance sensors to measure the tail clearance from the inner surface of the skin plate to the outer circumferential surface of the segment. The amount of eccentricity between the shield body and the segment is determined from the obtained tail clearance, and the tail clearance is maintained constant by controlling the direction of the shield body to reduce this amount of eccentricity. can do.

This solves problems such as the segments interfering with the skin plate of the shield body, making it difficult to assemble the segments, and since the distance sensor is provided within the skin plate of the shield body, it is possible to eliminate the problem of the segments interfering with the skin plate of the shield body. Compared to measuring methods and measuring devices, this method has a simpler configuration and can be implemented at a lower cost, and is not affected by deformation of segments or skin plates, making it possible to perform highly accurate measurements.

In addition, since the amount of eccentricity can be measured continuously, the inclination of the shield body and the segment can also be grasped, and by correcting the direction of the shield body based on the obtained data, highly accurate tunnel excavation can be performed along the construction needle am. is also possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is an enlarged view of a tail clearance measuring device, Fig. 2 is a sectional view of a shield tunneling machine, and Fig. 3 is an explanatory diagram of its operation.

Claims (1)

[Claims] A plurality of distance sensors 11 are provided in the circumferential direction in the skin plate 1b of the shield body 1 that excavates underground, and these distance sensors 11 measure the distance from the inner peripheral surface of the skin plate 1b to the outer peripheral surface of the segment 8. Tail clearance measurement device for shield tunneling machines that directly measures tail clearance.