JPH02278108A - Measuring apparatus for tail clearance of shielding machine - Google Patents

Abstract

PURPOSE:To automate measurement and thereby to enable execution of an effective control by a method wherein the amount of change in a tail clearance is converted into an electric signal and computed. CONSTITUTION:A detecting mechanism unit A is fitted to a skin plate 2 of a shielding machine and the mechanism unit A is provided with a turning arm member 6, which is so designed as to be always restricted in a gap between a segment 12 and the skin plate 2 by the segment 12 constructed in a tail clearance, i.e. a shield tail part, of the shielding machine and to rub the outer peripheral surface of the segment 12. According to this construction, the amount (x) of change in the tail clearance is represented by the amount (y) of displacement of a base-end shaft part 61 of the member 6, and a displacement converter 13 of a clearance computing unit B connected to the base-end shaft part 61 by a wire 14 measures the amount (y) of displacement and outputs it as an electric signal. Then, a computing element 15 computes the tail clearance on the basis of an output signal of the displacement converter 13 and the result of computation can be displayed in a display unit 16.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a tail clearance measuring device for a shield machine.

[Conventional technology]

In the shield construction method, the tail clearance of the shield machine, that is, the gap between the segment assembled in the shield tail part and the skin plate, is measured and managed based on the relative positional relationship between the assembled segment and the shield machine, the assembly status of the segment ( This is indispensable for checking whether the segments are assembled correctly (such as whether they are assembled in a circular shape) or whether it is possible to assemble subsequent segments. Traditionally, this tail clearance measurement was performed directly by a worker at the front end of the assembly segment using a scale.

[Question H that the invention attempts to solve]

This measurement itself is time-consuming and requires interrupting other work, and continuous measurement is not possible during shield excavation, so various construction management becomes result management and feedback of measurement results is required. There is a disadvantage of being late. Furthermore, with a large-diameter shield machine, it is not easy to move for measurements, and depending on the location, the footing may be poor and measurements may be difficult. An object of the present invention is to provide a tail clearance measuring device that eliminates these various drawbacks and can also be used as an element for measuring the attitude of a shield machine for automatic excavation.

[Means to solve the problem]

The shield machine tail clearance measuring device of the present invention includes a detection mechanism section A that is mounted on the skin plate of the shield machine and detects the amount of change in tail clearance, and a clearance calculation measurement unit that converts the detected amount of change into an electrical signal and calculates it. It consists of part B. The above-mentioned detection mechanism section A is configured to detect
A rotating arm member 6 that is always restrained by the segment and slides on the outer circumferential surface of the segment can be provided.

[Effect]

Therefore, the tail clearance of the shield machine can be automatically and continuously measured during shield excavation, and various types of management can be effectively carried out based on the measurement.

【Example】

The illustrated embodiment will be described in detail below. The measuring device of the present invention generally consists of a detection mechanism section A mounted on a skin plate of a shield machine, and a clearance calculation measurement section B connected thereto. The configuration of the detection mechanism section A is as follows. Reference numeral 1 denotes a machine frame that is fitted and fixed to a shallow recess 3 provided on the inner surface side of a skin plate 2 of the tail portion of the shield machine; A rotating arm member 6 rotatably supported in a through hole 5 provided in a side wall at a side end has both ends of its base shaft portion 6 provided in a side wall at the other end in the longitudinal direction of the machine frame l. This is a rotating arm member supported in the long groove 7 so as to be rotatable and linearly slidable. The length of the rotating arm member 6 is a+1, which is longer than the length l of the rotating arm member 4 by a required length a, and the tip portion 4□ of the rotating arm member 4 is placed close to the tip portion 6 on the side. Required parts6. That is, the proximal shaft portion 6. It is rotatably connected with a hinge 8 at a length 2 from . Reference numeral 9 denotes a projecting piece 4 of the proximal shaft portions 4+ and 6I of both rotating arm members 4 and 6.
．． ', 6. The tension spring 9 is tensioned between the proximal shaft portion 6 of the rotating arm member 6. Then, slide it toward the inner end side of the long groove 7, and both rotating arm members 4,
6 always exerts a predetermined force that tends to protrude in a chevron shape around the hinge 8. As a result, the rotating arm members 4 and 6 become flattened when the base end shaft portion 6 is located at the outer end of the long groove 7 against the tension spring 9, and the entire width of the rotating arm member 4, 6 becomes the width of the machine frame 1, in other words. Then, it can be sunk into the wall thickness of the skin plate 2, and when the proximal end shaft portion 6I is located at the inner end of the long groove 7 due to the force of the tension spring 9, it is in a relation that it protrudes the most. The detection mechanism section A having the above configuration is located between the shield jack 10 and the tail bracket 11 which are arranged at equal intervals inside the skin plate 2, and is located at the front segment 1 of the segment 121 assembled most recently within the shield tail section.
The tip end 6t of the rotating arm member 6 is installed at a position where it comes into contact with the outer peripheral surface of the 2□. Therefore, the rotary arm member 6 is designed to maintain the tail clearance of the shield machine, in other words, in the gap between the segment assembled in the shield tail portion and the skin plate 2.
It is always restrained by the segment and is in a relationship of sliding against the outer circumferential surface of the segment. Therefore, the above change in tail clearance 'PJx' is
Proximal shaft portion 6 of rotating arm member 6. This can be expressed as a change in fly. The configuration of the clearance calculation and measurement section B is as follows. 13 is the base end shaft portion 61 of the detection mechanism section A and the wire 14
A displacement transducer connected to the y is used to measure the amount of displacement y and output it as an electrical signal. 15 is a calculator which calculates the tail clearance (distance jiI between the segment and the tail plate) based on the output signal of the displacement converter 13. A display section 16 is connected to the arithmetic unit 15 and digitally displays the result of the arithmetic operation. The relationship between the change 1y in the base end shaft portion 6I of the rotating arm member 6 and the amount of change X in the tail clearance is as follows. sin α= x / a + 1 cosa = 21- y/ 2 I! . Therefore, a plurality of measuring devices of the present invention are installed on the inner periphery of the skin plate 2 forming the tail portion of the shield machine at regular intervals in the circumferential direction, that is, for example, at four locations on the top, bottom, left, and right. , it is clear that the tail clearance at each installation location can be measured simultaneously and automatically and continuously.

【Effect of the invention】

As is clear from the above description, the measuring device of the present invention is a very simple system consisting of a detection mechanism section that detects the amount of change in tail clearance, and a clearance calculation measurement section that converts the amount of change into an electrical signal and calculates it. The present invention is configured such that the tail clearance of the shield machine can be automatically and accurately measured during shield excavation, and a display unit connected to the clearance calculation measurement unit is installed at a desired position. This allows the measured values to be viewed at any location, and various types of management can be effectively carried out based on them. In other words, the relative positional relationship between the segments assembled in the shield tail part and the shield machine, the assembly status such as whether the segments are correctly assembled in a circular shape, and whether it is possible to continue assembling the segments, etc.
It is possible to understand accurately and take necessary measures. Furthermore, the measurement results can be fed back immediately. Even with a large-diameter shield machine, the tail clearance at a desired position can be easily measured, and there is no inconvenience such as conventional methods where the footing is poor and measurements are difficult. Furthermore, it can be used as an element to measure the attitude of a shield machine for automatic excavation. Furthermore, the detection mechanism section includes a rotating arm member that is always restrained by the segment and slides on the outer peripheral surface of the segment in the gap between the segment assembled in the shield tail section and the skin plate. Unlike conventional distance measuring sensors, since the length in the measurement direction is short, it is convenient to incorporate this into the skin plate. A...detection mechanism section, B...clearance calculation measurement section, 2...skin plate, 12.
．． 12□... Segment, 6... Rotating arm member.

[Brief explanation of drawings]

The drawings show an embodiment of the measuring device of the present invention, and FIG. 1 is an overall explanatory diagram, FIG. 2 is a side view of the state in use, FIG. 3 is a front view of the same, and FIG. 4 is a diagram of the detection a structure. The plan view and FIG. 5 are longitudinal sectional views of the same.

Claims (1)

[Claims] 1. Consists of a detection mechanism section mounted on the skin plate of the shield machine to detect the amount of change in tail clearance, and a clearance calculation and measurement section that converts the detected amount of change into an electrical signal and calculates it. A tail clearance measuring device for a shield machine, which is characterized by: 2. The detection mechanism section is equipped with a rotating arm member that is always restrained by the segment and slides on the outer peripheral surface of the segment in the gap between the segment assembled in the shield tail section and the skin plate. A tail clearance measuring device for a shield machine according to claim 1.