JPH0584797B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for measuring tail clearance of a shield machine.

[Prior art] When the shield machine is excavating, when the shield machine M and the segment S are in the position shown by the solid line as shown in FIG.
When the next segment S1 is moved to the position shown by the dashed line, the next segment S1 interferes with the skin plate P (X) and cannot be assembled. Furthermore, if the center A is moved to the center C to the position shown by the two-dot chain line, the inner surface of the skin plate P will come into contact with the outer edge of the leading segment S (Y), damaging the segment S, or Even if no damage occurs, the next segment S1 cannot be assembled.

In this way, when the shield machine excavates,
The distance between the inner surface of the skin plate P and the outer surface of the segment, ie, the tail clearance Δd1Δd2, has become one of the most important control items.

[Problems to be Solved by the Invention] By the way, tail clearance, which is one of the most important control items, has conventionally been measured without a suitable measuring device, and workers have to measure it as needed (i.e., after assembling segments or (before assembly) was measured using a scale. Therefore, the efficiency of automatic digging by the shield machine was restricted.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for measuring the tail clearance of a shield machine that automatically measures the tail clearance and improves the efficiency of automatic excavation. .

[Means for Solving the Problem] According to the present invention, after the segment is assembled by the erector, a linear laser beam is applied to the tail clearance including the end face of the segment from the laser oscillation tube attached to the erector through the cylindrical lens. A base line is irradiated, the displacement of the base line irradiated onto the end face of the segment and the skin plate is measured with a television camera, and the tail clearance is determined from the displacement of the base line measured with the television camera.

[Operations and Effects of the Invention] Therefore, the tail clearance can be automatically determined from the base line position irradiated onto the end face of the segment and the skin plate, and the efficiency of automatic excavation of the shield machine can be improved.

[Preferred Embodiment] When carrying out the present invention, it is preferable that the laser beam be irradiated obliquely above the end face of the segment in a plane that includes the axis of the skin plate, and that the axis of the television camera be inclined with respect to the plane.

In carrying out the invention, it is preferable that the laser tubes and television cameras are arranged on the propulsion jack spreader, for example, at four equal intervals around the circumference.

[Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a measuring device implementing the invention.

In the figure, a rotary part 2 of an erector, generally designated by reference numeral 1, is rotatably supported at the rear of the shield machine M. A section 4 is provided.

The propulsion jack spreader 16 has assemblies 5 of laser oscillation tubes 6 and television cameras 8 arranged at four equal intervals around the circumference.
is provided by a bracket 5a. Referring also to FIG. 4, the laser oscillation tube 6 is connected to the skin plate P.
It is provided obliquely above the end surface Sa of the segment S in a plane D including the axis of the segment S, and a linear base line L is irradiated through the cylindrical lens 7 onto the tail clearance Δd including the segment end surface Sa. The axis of the television camera 8 is inclined to the right with respect to the plane D in the illustrated example.

In FIG. 3, each laser oscillation tube 6,
6... are connected to a power source 9, the respective television cameras 8, 8... are connected to image processing devices 10, 10, and these image processing devices 10, 10... are connected to a microcomputer 11.

During the measurement, as shown in FIG. 4, the laser oscillation tube 6 irradiates the tail clearance Δd with a linear base line L through the cylindrical lens 7. Therefore, the television camera 8 captures the base line L1 irradiated onto the segment end face Sa and the base line L2 irradiated onto the skin plate P onto the same image.
The ITV signal is sent to the image processing device 10. Then, based on the ITV signal, the image processing device 10 sends to the microcomputer 11 a displacement signal corresponding to the displacement E of the base lines L1 and L2 (FIG. 5) due to the inclination of the axis of the television camera 8 with respect to the plane D. The microcomputer 11 calculates the tail clearance Δd corresponding to the displacement E based on the displacement signal, determines the relative positional relationship between the shield machine M and the segment S from the four tail clearances Δd, and provides feedback to automatic excavation. When the tail clearance Δd is zero in this measurement, the base line L on the image is shown in FIGS. 6 and 7.
1 and L2 form a continuous broken line.

[Summary] As explained above, according to the present invention, the tail clearance can be automatically determined from the displacement of the baseline irradiated onto the end face of the segment and the skin plate, and the efficiency of automatic excavation of the shield machine can be improved. .

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a shield machine showing a measuring device implementing the present invention, Fig. 2 is a view taken in the direction of arrow I in Fig. 1,
3 is a control block diagram of the measuring device, FIG. 4 is a perspective view illustrating an embodiment of the present invention, and FIG. 5 is a control block diagram of the measuring device.
Figures 6 and 7 are drawings that correspond to Figures 4 and 5 when the tail clearance is zero, and Figure 8 is a diagram showing the digging direction of the shield machine and the segments. It is a side sectional view explaining the relationship. △d...Tail clearance, E...Baseline displacement,
L, L1, L2...Baseline, M...Shield machine, P...Skin plate, S...Segment, Sa...Segment end face, 2...Erector rotating part, 6...Laser oscillation tube, 7...Cylindrical lens, 8...TV camera .

Claims (1)

[Claims] 1 After assembling the segment with the erector, a linear base line of laser beam is irradiated from the laser oscillation tube attached to the erector to the tail clearance including the end face of the segment through a cylindrical lens, and the base line is irradiated onto the end face of the segment and the skin plate. A method for measuring a tail clearance of a shield machine, comprising: measuring the displacement of the base line with a television camera, and determining the tail clearance from the displacement of the base line measured with the television camera.