JPH11182175A - Tail clearance measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tail clearance measuring device which can determine the tail clearance without contact with a skin plate. SOLUTION: A tail clearance measuring device comprises a measuring arm 32 contacting with the inside surface of each segment 20, an arm position sensor 44 to sense the contacting position of the arm 32 from the reference position, a jack shoe inclining angle sensor 46 to sense the roll inclination angle of a jack shoe 14 which presses the end face of the segment 20, and the distance between the jack shoe 14 and a skin plate 16 is determined from the roll inclination angle given by the jack shoe inclining angle sensor 46 and a calculation part calculates the tail clearance of the segment 20 with the skin plate 16 from the obtained distance and the segment contacting position of the measuring arm 32 given by the arm position sensor 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail clearance measuring device for measuring a tail clearance between a skin plate constituting a tail part of a shield machine and a segment which has been assembled in a ring shape in the tail part.

[0002]

2. Description of the Related Art Conventionally, as this type of tail clearance measuring apparatus, there are those described in Japanese Patent No. 2595240 and Japanese Patent Application Laid-Open No. 3-119298. In this publication, a segment contactor that contacts the inner peripheral surface of a segment to detect the position of the inner peripheral surface of the segment and a skin plate contact that contacts the inner surface of the segment and detects the position of the inner peripheral surface of the skin plate And a tail clearance is obtained by subtracting a known segment thickness from the difference between the positions of these two contacts.

[0003]

However, in a shield machine, a backing material is often used for strengthening the ground, and the backing material may leak from between the skin plate and the segment. There is a problem that when the leaked backing material enters the sliding mechanism of the skin plate position detection sensor, it does not operate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the inventions of claims 1 and 2 provide a tail clearance measuring device capable of obtaining a tail clearance without contacting a skin plate. With that purpose.

[0005]

Means for Solving the Problems In order to achieve the above object, according to the first aspect of the present invention, the skin plate constituting the tail of the shield machine and the ring-shaped assembly in the tail are completed. A tail clearance measurement device that measures a tail clearance between the segment, a measurement arm that contacts the segment inner peripheral surface, a measurement arm position detector that detects a segment contact position of the measurement arm from a reference position, A jack shoe angle detector that detects the roll angle of the jack shoe that presses the end face of the segment, and the distance between the jack shoe and the skin plate using the roll angle detected by the jack shoe angle detector. And the obtained contact distance and the segment contact position of the measuring arm detected by the measuring arm position detector. And a calculator for calculating the tail clearance between the segments and the skin plate from.

The operation of the present invention will be described with reference to FIG.
FIG. 6A shows a case where the jack shoe 14 pressing the end face of the segment is at the correct position directly facing the skin plate 16. In this case, the jack shoe 14 is shown.
The gap g between the skin and the skin plate 16 is a constant value.
The jack shoe 14 can be inclined about the center point A. The point B is a point at or near the reference position, and a length measured in a direction perpendicular to the center line C from the center point A is Q. FIG. 6B shows the jack shoe 14.
Represents a state in which the skin plate 16 is inclined with respect to the center point A with respect to the center, for example, an angle P is inclined, and the point B has moved to the point B ′. At this time, B
The distance between B ′, that is, the change amount Δh of the distance from the skin plate 16 is small because the roll inclination angle P is small.

[0007]

## EQU1 ## Δh ≒ QsinP ≒ QP. When the distance between the jack shoe 14 and the skin plate 16 near the reference position using the above equation, that is, the gap h, is obtained,

[0008]

H = g + Δg + Δh−Δg = g + Δh ≒ g + QP (1) Note that Δg is the length from the point B to the end face of the jack shoe 14. Thus, the jack shoe 14
The distance between the jack shoe 14 and the skin plate 16 is obtained by using the roll inclination angle P of the existing arm, and the distance between the jack shoe 14 and the skin plate 16 and the segment contact position of the measuring arm detected by the measuring arm position detector are used to determine the existing segment. The tail clearance between the segment and the skin plate can be calculated using the thickness and the like.

According to a second aspect of the present invention, in the first aspect, a shield machine tilt angle detector for detecting a roll tilt angle of the shield machine is further provided, and the arithmetic unit includes a shield machine. Based on the roll inclination angle of the shield machine detected by the inclination angle detector and the roll inclination angle of the jack shoe detected by the jack shoe inclination angle detector, the true from the position directly facing the skin plate of the jack shoe. And a tail clearance between the segment and the skin plate is calculated from the true roll inclination angle and the segment contact position of the measurement arm detected by the measurement arm position detector.

When the entire shield machine is inclined and has a roll inclination angle, the roll inclination angle of the jack shoe 14 detected by the jack shoe inclination angle detector includes the roll inclination angle of the shield machine. , The roll inclination angle ROLL is removed, and the true roll inclination angle (P-ROLL) from the directly-facing position (the state shown in FIG. 6A) is obtained, and this true roll inclination angle (P-ROLL) is calculated. If the distance between the jack shoe 14 and the skin plate 16 is determined by using the distance, the result becomes more accurate. That is, instead of equation (1)

[0011]

H３g + Qsin (P-ROLL) (2)

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 10 denotes a shield machine, which has a cutter at a head portion 11 and a plurality of shield jacks 12 fixed in a circumferential direction inside the cylindrical shell portion 13 so as to be shielded. The jack 12 enables the shield machine 10 to be propelled. That is, a jack shoe 14 is attached to the tip of the jack rod 12a of the shield jack 12 via the joint 12b.
4 is pressed against the end face of the segment 20, and the shield machine 10 is propelled by utilizing the reaction force. The jack shoe 14 can be tilted in the rolling direction with respect to the jack rod 12a by the joint 12b.

A tail clearance measuring apparatus according to the present invention for measuring a tail clearance C between a skin plate 16 constituting a tail portion of the shield machine 10 and a segment 20 assembled in a ring shape in the tail portion. 30 is attached to the jack shoe 14. FIG. 3 and FIG.
And FIG. 5 is a block diagram showing the same.

The tail clearance measuring device 30 mainly includes a measuring arm 32 that contacts the inner peripheral surface of the segment 20.
An arm driving unit 38 for driving the measuring arm 32, a measuring arm position detector 44 for detecting a contact position of the measuring arm 32 from a certain reference position, and a jack shoe for detecting a roll inclination angle of the jack shoe 14. An inclination angle detector 46, a constant input unit 48 for inputting a known constant in advance, a measurement commander 50 for outputting a measurement start signal or a measurement end signal by manual operation, and an arm driving unit 38
And outputs a control signal to control the measurement arm 32, and receives signals from the measurement arm position detector 44, the jack shoe inclination angle detector 46, the constant input unit 48, and the measurement command unit 50 to change the tail clearance C. The control unit 52 includes a control calculation unit 52 that performs calculation, and a display unit 54 that is connected to the control calculation unit 52 and that displays the tail clearance C. Further, the tail clearance measuring device 30 includes a shield machine tilt angle detector 56 for detecting the roll tilt angle of the entire shield machine 10, and a signal from the shield machine tilt angle detector 56 is sent to the control calculation unit 52. And used for calculating the tail clearance C. Control operation unit 5
2 can be configured by a computer including a CPU and a memory.

The measurement arm 32 has one end side pivotally attached to a measurement case 34 attached to the jack shoe 14 (shaft attachment point 32a), and the other end side protrudes from the measurement case 34. At its protruding end,
A roller 36 that rolls on the inner peripheral surface of the segment 20 is rotatably mounted. The measurement arm 32 is positioned so as to be separated from the segment 20 by the winding of a spiral spring (not shown) at the time of non-measurement. In response to the measurement start signal, the spiral spring is entrained by the motor constituting the arm drive unit 38, whereby the measurement arm 32 rotates in the direction of the inner peripheral surface of the segment 20, and the roller 36 contacts the inner peripheral surface of the segment 20. And start rolling. After that, the rotation angle of the measurement arm 32 changes so that the roller 36 follows the inner peripheral surface of the segment 20. Also,
The winding of the spiral spring is released by the measurement end signal, and the roller 36 again rotates in a direction away from the inner peripheral surface of the segment 20.

In the vicinity of the shaft attachment point 32a of the measuring arm 32,
A contact terminal 40 that rotates following the rotation of the measurement arm 32
And a measuring arm position detector 44 composed of a potentiometer having a resistor 42 with which the contact terminal 40 slides.
Is arranged. The measuring arm position detector 44 is provided with a contact terminal 4 that fluctuates following the fluctuation of the tilt angle of the measuring arm 32.
A signal corresponding to the contact position of 0 is sent to the control calculation unit 52.

A jack shoe angle detector 46 is provided in the measuring case 34, and its detection axis is set to detect the roll angle of the jack shoe 14. As the jack shoe tilt angle detector 46, a known tilt meter such as a servo type accelerometer or a type using an electrolytic solution can be used. The shield machine tilt angle detector 56 also detects the roll tilt angle of the entire shield machine 10 using a well-known inclinometer, similarly to the jack shoe tilt angle detector 46, and is a shield machine other than the jack shoe 14. 10 are provided at appropriate positions.

From the constant input section 48, the thickness L of the segment 20, the radius r of the roller 36, and the shaft attachment point 32a of the measuring arm 32 are known as reference positions.
, The distance d from the surface of the jack shoe 14 facing the skin plate 16, the measurement arm length R that is the distance from the shaft attachment point 32 a to the roller 36, the regular distance g between the jack shoe 14 and the skin plate 16. Are input and stored in the memory of the control / arithmetic unit 52.

When the measurement start command from the measurement command unit 50 is sent to the control calculation unit 52, the tail clearance measurement device 30 configured as described above operates the measurement arm by driving the arm drive unit 38 as described above. 32 contacts the inner peripheral surface of the segment 20, and the roller 36 rolls with the movement of the shield machine 10. The signals from the measuring arm position detector 44, the jack shoe inclination angle detector 46, and the shield machine inclination angle detector 56 are transmitted to the control arithmetic unit 5
2

The control operation section 52 performs an operation based on the following equation. That is, the measurement arm 32 from the reference position 32a
The segment contact position of

[0021]

Xr = Rsinθ-r (3) Using this equation (3), the tail clearance C is

[0022]

C = d + h + R sin θ− (L + r) (4) Further, by substituting equation (2),

[0023]

C = d + g + Q sin (P-ROLL) + R sin θ− (L + r) (5) Accordingly, the control calculation unit 52 calculates the tail clearance C by calculating the expression (5). The display unit 54 receives and displays the data of the tail clearance C. The roll inclination angle P is obtained from the output value from the jack shoe inclination angle detector 46 when the jack shoe 14 faces the skin plate 16 (the state shown in FIG. 6A). Shall be deducted.

As described above, according to the present embodiment, the tail clearance C can be measured without bringing the tail clearance measuring device 30 into contact with the skin plate 16. In the above embodiment, the measuring arm 32
Has been described with respect to a configuration in which the measurement arm rotates about the shaft attachment point 32a. However, the present invention is not limited to this, and it goes without saying that the measurement arm may directly move.

In the present embodiment, the measurement command device 50 which is manually operated is provided.
May be fetched as a measurement start command signal when extension is started, and a signal when the extension of the shield jack 12 is ended may be fetched as a measurement end command signal.

[0026]

As described above, according to the first and second aspects of the present invention, the tail clearance can be measured without bringing the tail clearance measuring device into contact with the skin plate. The backing material does not enter the tail clearance measuring device to cause malfunction and deterioration of the measurement accuracy, and the measurement can be performed stably. Also, since there is no need to clean the backing material that has entered, maintenance is also simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a shield machine that can use a tail clearance measuring device of the present invention.

FIG. 2 is an arrow view as viewed from a line 2 in FIG. 1;

FIG. 3 is a perspective view of a partial cross section showing an embodiment of the tail clearance measuring device of the present invention.

FIG. 4 is an explanatory sectional view illustrating measurement of tail clearance in the tail clearance measuring device of FIG. 3;

FIG. 5 is a block diagram illustrating an embodiment of a tail clearance measuring device according to the present invention.

FIG. 6 is an explanatory diagram illustrating the principle of measuring tail clearance according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shield machine 14 jack shoe 16 skin plate 20 segment 30 tail clearance measuring device 32 measuring arm 44 measuring arm position detector 46 jack shoe inclination angle detector 52 control operation part (operation part) 56 shield machine inclination angle detector C tail clearance

Claims (2)

[Claims] 1. A tail clearance measuring device for measuring a tail clearance between a skin plate constituting a tail portion of a shield machine and a segment which has been assembled in a ring shape in the tail portion, wherein a tail clearance measuring device is provided. A measuring arm that contacts, a measuring arm position detector that detects a segment contact position of the measuring arm from a reference position, and a jack shoe tilt angle detector that detects a roll tilt angle of a jack shoe that presses an end surface of the segment, The distance between the jack shoe and the skin plate is determined by using the roll inclination angle detected by the jack shoe inclination angle detector, and the measured distance and the segment contact of the measurement arm detected by the measurement arm position detector are determined. A calculation unit that calculates the tail clearance between the segment and the skin plate from the position Tail clearance measurement device comprising a. And a shield machine tilt angle detector for detecting a roll tilt angle of the shield machine.
The arithmetic unit, from the roll tilt angle of the shield machine detected by the shield machine tilt angle detector, and the roll tilt angle of the jack shoe detected by the jack shoe tilt angle detector, the skin plate of the jack shoe Calculating a true clearance between the skin plate and the segment from the true roll inclination angle from the position facing the roll and the segment contact position of the measurement arm detected by the measurement arm position detector with the true roll inclination angle. Item 7. A tail clearance measuring device according to Item 1.