JPH0376399B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a tail clearance measuring device for a shield tunneling machine that can automatically measure the clearance between a skin plate and a segment in the tail portion of a shield tunneling machine. Regarding.

[Conventional technology]

In excavation using a shield excavator, the measurement of tail clearance is used as (1) judgment data for selecting the position of the shield jack when controlling the attitude of the shield excavator itself, and (2) whether or not to adopt a taper segment during curved construction. (3) Required as judgment data for buoyancy effects.

Conventionally, this tail clearance measurement has been manually performed for the top, bottom, left, and right at the end of excavation, at rest, or at the end of segment assembly.

[Problem that the invention seeks to solve]

However, the above manual measurement method has the following drawbacks. In other words, (1) in the case of a medium-sized or large-diameter shield excavator, it is troublesome to secure a foothold each time a measurement is taken and to dismantle it after each measurement; This is dangerous because it forces the patient into an unnatural posture.

(3) Since the measurement location is at the corner, it is difficult to measure the accuracy and the measurement error tends to be large. Another problem is that the tail clearance measurement data cannot be ignored when attempting to automate the attitude control of the shield tunneling machine itself.

This invention was made in view of the above circumstances,
What is its purpose? Achieved a tail clearance measuring device for shield excavators that can automate tail clearance measurement, eliminate the need to secure a foothold for measurement, eliminate danger to workers, and perform relatively accurate measurements. It is to be.

[Means for solving problems]

In the tail portion of a shield tunneling machine, this invention includes a biasing body that is attached to a skin plate and arranged such that one end abuts against a segment due to elastic action, and a skin plate that is attached to a skin plate based on the amount of deformation of this biasing body. and a detection section that detects the clearance between the segment and the segment.

〔Example〕

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

1 to 4 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing a schematic configuration of a shield tunneling machine to which the present invention is applied, and FIG. 2 is a first embodiment of the present invention.
A-A line arrow view in the figure, Figure 3 is a sectional view of the main part, Figure 4
The figure is an enlarged view of the main parts.

In these figures, reference numeral 1 indicates a cylindrical skin plate, inside which is a shield jack 2.
A plurality of are provided in the circumferential direction. The shield jack 2 uses a spreader 4 to press the front end (left end in the figure) of the segments 3 that are sequentially added in the excavation direction, and applies thrust to the skin plate 1 by the reaction force.

The shield excavator excavates earth and sand using a digging bit (both not shown) attached to a rotary drum that is rotationally driven at the front end, and the excavated earth and sand are connected to the rear of the erector 5. and is transferred to a conveyor device (not shown), which has been installed, and is discharged to the rear by the conveyor device.

6 is a tail seal that seals between the rear end of the skin plate 1 and the segment 3, and 7 is a ring for protecting the tail seal.

Reference numeral 8 denotes segment floats, which are arranged at appropriate intervals on the inner periphery of the lower part of the skin plate 1.
The segment 3 and the skin plate 1 are held concentrically by being supported in a slightly floating state.

The above configuration is basically the same as the conventional one, and the feature of the shield tunneling machine according to the present invention is the following configuration.

That is, a tail clearance measuring device 9 is installed inside the shield tunneling machine shown in FIG. This tail clearance measuring device 9 includes a measuring device main body 10 provided between the skin plate 1 and the segment 3, a signal cable 11 connected to this measuring device main body 10,
The measuring device main body 10 is connected via this signal cable 11.
The conversion device 12 is connected to the converter 12.

As shown in FIGS. 2 and 3, the measuring device main body 10 is installed at four locations on the upper, lower, left and right sides of the inner periphery of the skin plate 1 in the tail portion, and is located between the segment floats 8. The clearance between the skin plate 1 and the segment 3 is detected. Further, the conversion device 12 is installed in front of the measuring device main body 10 (in the excavation direction), and converts the detected data into dimensional data between the skin plate 1 and the segment 3.

The measuring device main body 10 will be explained in detail with reference to FIG. 4.

In the tail portion of the shield tunneling machine, a recess 13 is provided on the inner periphery of the skin plate 1 in which the measuring device main body 10 is installed. A load cell 14 is attached to the recess 13. A coil spring 16 is fixed to the upper surface of the load cell 14 via a fixing member 15. A roller 18 is attached to the coil spring 16 at the upper end of the coil spring 16.
An engaging member 17 is attached for engaging. A roller 18 is attached to the side of the engagement member, and this roller 18 is adapted to abut against the segment 3. In the above configuration,
Load cell 14, fixing member 15, and coil spring 1
6, the engaging member 17, and the roller 18 constitute the measuring device main body 10 described above.

Further, in the above configuration, the coil spring 16
The segment 3 is pressed through the roller 18 by elastic action, and a load is applied to the load cell 14 by the reaction force. The load meter 14 measures the load received from the coil spring 16 and outputs a signal to the outside. Further, the roller 13 is used to reduce the shearing force and frictional force between the segment 3 and the coil spring 16 as much as possible.

Next, the operation of the tail clearance measuring device 9 for a shield tunneling machine having the above configuration will be explained.

In the measuring device body 10 attached to the inner periphery of the skin plate 1, the coil spring 16 presses the segment 3 via the roller 18 due to its elastic action. The coil spring 16 applies a load to the load cell 14 by the reaction force from the segment 3. The load cell 14 measures the load and sends this load data to the conversion device 12 via the signal cable 11. The converting device 12 converts the sent load data into dimensional data between the skin plate 1 and the segment 3, and outputs this dimensional data to the outside with a signal. The output signal is then used as a display signal, attitude control signal, or the like.

5 and 6 show a second embodiment of the present invention. In these figures, parts common to those in FIGS. 1 and 4 are given the same reference numerals to simplify the explanation.

The feature of the second embodiment is that the measuring device main body 10 in the first embodiment is replaced with a measuring device main body 20.

The measuring device main body 20 is a device having the same function as the measuring device main body 10, and is provided in the recess 13, as shown in FIG. 4, as described above. This measuring device main body 20 includes a plate spring fixing member 21 installed in the recess 13 and a plate spring fixing member 2.
1 and a strain gauge 23 attached to the U-shaped portion B of the U-shaped leaf spring 22.
The end A of the U-shaped leaf spring 22 comes into contact with the segment 3.

In the above configuration, the U-shaped leaf spring 22 presses the segment 3 by elastic action, and
When the free end A receives a reaction force from the U-shaped portion B, distortion occurs in the U-shaped portion B, and stress is generated. In addition, the strain gauge 23 is connected to the U-shaped portion B of the U-shaped leaf spring 22.
It measures the stress generated on the outside and outputs it as a signal.

Next, the operation of the tail clearance measuring device 19 of the shield tunneling machine having the above configuration will be explained.

In the measuring device main body 20 attached to the inner periphery of the skin plate 1, the U-shaped leaf spring 22 presses the segment 3 by elastic action. Leaf spring 2
2 receives a reaction force from the segment 3 at the free end A, thereby causing distortion in the U-shaped portion B and generating stress. The strain gauge 23 measures this stress and sends it to the conversion device 12 via the signal cable 11. The converting device converts the sent stress data into dimensional data between the skin plate 1 and the segment 3, and outputs this dimensional data to the outside with a signal. The output signal is then used as a display signal, attitude control signal, or the like.

〔Effect of the invention〕

As explained above, according to the present invention, the following excellent effects can be obtained.

To automatically measure tail clearance simultaneously, safely, with high precision, and in a short time at any location, for example, four locations on the top, bottom, left, and right without building a scaffold.

Since the measurement data can be extracted externally as an electrical signal, it can be used as input data for automatic attitude control, enabling effective attitude control of the shield excavator.

Commercially available measuring instruments can be used and can be easily applied to conventional shield excavators.

[Brief explanation of drawings]

1 to 4 are diagrams showing a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view showing a schematic internal structure of the shield tunneling machine, and FIG. 2 is a line AA in FIG. 1.
3 is a sectional view of the main part, and FIG. 4 is an enlarged view of the main part. 5 and 6 are diagrams showing a second embodiment of the present invention, in which FIG. 5 is a vertical sectional view showing a schematic internal structure of the aircraft, and FIG. 6 is an enlarged view of the main parts. 1...Skin plate, 3...Segment, 1
0, 20... Measuring device main body, 11... Signal cable, 12... Conversion device, 14... Load cell, 16...
...Coil spring, 18...Roller, 22...
...U-shaped leaf spring, 23...strain gauge.

Claims (1)

[Claims] 1. A device for measuring the clearance between a skin plate and a segment in the tail portion of a shield tunneling machine, the device being attached to the skin plate and arranged so that one end comes into contact with the segment due to elastic action. A tail clearance measuring device for a shield excavator, comprising: a biasing body that has been deformed; and a detection unit that detects a clearance between a skin plate and a segment based on the amount of deformation of the biasing body. 2. The tail clearance measuring device for a shield tunneling machine according to claim 1, wherein the biasing body is a coil spring and the detection body is a load meter. 3. The tail clearance measuring device for a shield tunneling machine according to claim 1, wherein the biasing body is a leaf spring and the detection body is a strain gauge.