JPH0650036B2 - Tail clearance measuring device for shield machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tail clearance measuring device for a shield machine, which can automatically measure a clearance between a skin plate and a segment in a tail portion of the shield machine.

"Prior art and its problems" When excavating with a shield machine, the tail clearance (clearance between the skin plate and the segment of the tail) is the shield clearance of the shield jack when controlling the attitude of the shield machine itself. As position selection judgment data,
It is required as the judgment data of taper segment during curve construction and as judgment data of buoyancy effect. Conventionally, this clearance is measured at the top / bottom / left at the end of excavation or at rest or at the end of segment assembly.・
The actual situation is that the right side is done manually.

However, such a manual measurement method has the following drawbacks.

That is, (1) in the case of a medium- or large-sized shield machine, it is troublesome to secure a scaffold and dismantle it after each measurement. (2) In the upper and left / right measurements, This is disadvantageous in that the person is forced to have an unnatural posture and is dangerous. (3) Since the measurement location is at the corner, it is difficult to emulate and the measurement error tends to be large.

The present invention has been made in view of the above circumstances, and the tail clearance measurement can be automated, and it is not necessary to secure a scaffold for the measurement, which can eliminate the danger of the operator and is relatively accurate. It is an object of the present invention to provide a tail clearance measuring device for a shield machine capable of various measurements.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a biasing member that is attached to a skin plate and has one end abutting against a segment by its own elastic action in a free state. , A wire attached to the tip of the biasing member in contact with the segment of the biasing member so that one end faces the same direction as the biasing direction of the tip of the biasing member, and the length of the wire attached to the other end side of the wire A length measuring machine for measuring the amount of movement in the direction and converting it into an electric signal and outputting the electric signal, and a pausing means for pulling the wire toward the length measuring machine against the biasing member to bring the measurement into a pausing state. It was configured.

"Operation" At the time of excavation and assembly of the segment, the pause means works, the tip of the urging member is retracted and does not contact the segment, and measurement is not performed. In this case, the shield jack-up and the assembly of the segments are performed without any trouble.

When performing the measurement, the pause means is released. The biasing member is deformed by its own elastic action and its tip contacts the segment. At the same time, the wire connected to the tip of the biasing member moves in the length direction, and the amount of movement is measured by the length measuring machine and output as an electric signal. This output signal is appropriately compensated and used as a display signal or an automatic control signal.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a vertical sectional side view showing the schematic structure of a shield machine to which the present invention is applied, and FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is an enlarged view of a main part.

In these drawings, reference numeral 1 indicates a cylindrical skin plate, and a plurality of shield jacks 2 are provided inside thereof in the circumferential direction. The shield jack 2 presses the front end (the left end in the drawing) of the segment 3 which is sequentially added in the excavation direction with the spreader 4, and the reaction force of the shield jack 2 gives a thrust to the skin plate 1.

The shield machine excavates while excavating the natural earth and sand with an excavation bit (both not shown) attached to a rotary drum that is rotationally driven at the front end. It is transferred to the installed conveyor device and discharged backward 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.

8 is a segment float, which is a skin plate 1
Are arranged at appropriate intervals on the inner circumference of the lower part of
The segment 3 is supported in a state of being slightly floated from the skin plate 1, and the segment 3 and the skin plate 1 are held concentrically.

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

That is, tail clearance measuring devices are attached to the tail portion of the shield machine shown in the figure at four places on the left and right sides (only the device for the ground portion is shown in the figure). This tail clearance measuring device will be described in detail with reference to FIGS. 2 to 4. A spring plate 10 is attached to the inner periphery of the skin plate 1 so as to be positioned between the segment floats 8. The spring plate 10 is formed in a U shape as a whole, and has both leg portions 11 arranged in parallel with each other and a connecting portion 1 for connecting one ends thereof to each other.
2, the spring plate 10 is fixed to the skin plate 1 by screwing the bent portion 10a at the tip of the leg 11. In the free state of the spring plate 10, the tip 12a of the connecting portion 12 at the tip of the connecting portion 12 is the segment 3
So as to come into contact with the above-mentioned structure, it is configured to rotate counterclockwise about the bending point X of the leg portion 11 in FIG. 3 by its own elastic action.

One end of the wire 13 is connected to the connecting portion tip 12a of the spring plate 10 so as to face the same direction (vertical direction) as the urging direction of the connecting portion tip 12a of the spring plate 12. Wire 1
The other end of 3 is oriented so as to extend horizontally forward (left in FIG. 3) via the first roller 14 attached to the skin plate position corresponding to directly below the tip 12a of the connecting portion of the spring plate 10. Further, the direction is changed so as to extend upward through the second roller 15 attached to the skin plate 1 at a predetermined position.

The other side of the wire 13 is connected to the length measuring machine 16. The length measuring machine 16 is fixed to a mounting plate 17 fixed by a stay (not shown) extending from the skin plate 1 (see FIG. 4). The length measuring machine 16 has a built-in encoder so that it can output a measured value according to the length of the drawn wire as an electric signal to the outside. Further, the length measuring machine 16 is arranged in a place where it does not hinder the movement of the spreader 4 and the assembly of the segment 3, for example, between the shield jacks 2.

In the middle of the wire 13, the wire 13 is pulled toward the length measuring machine 16 side against the urging force of the spring plate 10, and one side of the wire 13 is separated from the segment 3 so that the wire between the segment 3 and the skin plate 1 is separated. Pausing means 18 for pausing the clearance measurement is provided. The resting means 18 includes the wire 13
An iron piece 19 attached to a magnetic coil 20, a magnetic coil 20 arranged near the length measuring machine 16 and having the wire 13 inserted in its hollow portion, and the magnetic coil 20 is energized to excite the magnetic coil 20 as necessary. It consists of a coil controller (not shown).

Next, the operation of the tail clearance measuring device of the shield machine having the above-described configuration will be described.

During excavation or segment assembly, the clearance measurement is stopped by the stopping means 18. That is,
The magnetic coil 20 is excited to attract the iron piece 19, and the wire 13 is pulled toward the length measuring machine 16 side. Spring plate 1
One end of 0 is held by the wire 13 so as not to come into contact with the segment 3, and one end of the wire 13 is also held so as not to come into contact with the segment 3 at the same time. In this state, the spreader 4 can be moved and the segment 3 can be assembled without any trouble.

On the other hand, when measuring the clearance, the power supply to the magnetic coil 20 is cut off. Then, the wire 13 is pulled by the elastic action of the spring plate 10 and is pulled out until one end thereof comes into contact with the segment 3. The amount of movement of the wire 13 at this time (in FIG. 3
₁ - ₂₎ is output is measured in length measuring machine 16 in the form of an electrical signal. Then, this electric signal is used as a display signal or an automatic control signal after being appropriately compensated by a computing unit. Movement amount ₁ of the wire 13 - ₂ is different from the actual clearance between the skin plate 1 and segment 3, but are compensated tail clearance by preinstalled programs when entered into the calculator.

Power is supplied to the magnetic coil 20 by interlocking the operating circuit of the shield jack 2 and the operating circuit of the erector so that the magnetic coil 20 is energized during excavation or segment assembly. That is, the wire 13 is always pulled back during excavation or segment assembly so that the tip 12a of the connecting portion of the spring plate 10 and one end of the wire 13 do not project above the upper surface of the segment float 8.

In addition, a specific method of excavating by the shield excavator based on the information obtained from the tail clearance measuring device will be described with reference to FIGS.

As shown in Fig. 5 (a), when digging straight,
Dig so that the left and right tail clearances L ₁ and L ₂ have the same value.

When turning to the right as shown in FIG. 5 (b), the left tail clearance L ₁ is the right tail clearance L ₂
It must be smaller.

In the opposite case, that is, when the left tail clearance L ₁ is larger than the right tail clearance L ₂ as shown in FIG. 5 (c), when the taper segment 23 is set and the jack thrust is applied, the reaction is reversed. While the left segment 3a moves outward due to the force and accurate construction cannot be performed, in the case of Fig. 5 (b), when the left segment is trying to shift outward, the segment itself is This is because it is supported by and its movement is suppressed.

In the case of FIG. 5 (c), the reverse taper segment 24 is once set as shown in FIG. 5 (d), and the left side taper clearance L ₁ is made smaller than the right side taper clearance L ₂ . After that, a normal taper segment may be set and then constructed.

"Effects of the Invention" As described above, the present invention has the following excellent effects.

The tail clearance can be measured simultaneously, safely, with high accuracy and in a short time at any place, for example, four places on the right and left of the top and bottom without constructing a scaffold.

Since the measurement data can be taken out as an electric signal to the outside, it can be used as input data to the automatic attitude control, and effective attitude control of the shield machine can be performed.

Since the length measuring machine and the measuring point are connected by wires,
The length measuring machine and the measurement stopping means can be arranged at any place in the shield machine.

The configuration is one in which the tail clearance is measured by pulling the wire by the urging member, the number of parts is small, and the maintenance is easy because of a pure mechanical configuration.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view showing a schematic configuration of the inside of a shield machine, and FIG. 2 is II of FIG.
-A view along the line II, Fig. 3 is a cross-sectional view of the main part, Fig. 4 is a perspective view of the main part, and Figs. 5 (a) to (d) are explanatory views showing the excavation state of the shield machine. is there. 1 ... Skin plate, 2 ... Shield jack, 3 ...
… Segment, 6 …… Tail seal, 10 …… Spring plate,
13 ... wire, 16 ... length measuring machine, 18 ... resting means,
19 ... Iron piece, 20 ... Magnetic coil.

Claims (1)

[Claims] 1. A device for measuring a clearance between a skin plate and a segment in a tail portion of a shield machine, which is attached to the skin plate so that one end abuts on the segment by its own elastic action. And a wire attached to the tip of the biasing member in contact with the segment of the biasing member so that one end faces the same direction as the biasing direction of the tip of the biasing member, and the other end side of the wire. A length measuring machine which is attached to the wire to measure the amount of movement in the length direction of the wire and converts it into an electric signal for output, and a measurement halt state by pulling the wire toward the length measuring machine against the biasing member. And a tail clearance measuring device for a shield machine.