JPH1162471A - Tail clearance measuring device for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate measurement of a tail clearance by fitting a measuring device for directly measuring the tail clearance between a shield frame and a segment to a moving device that can be brought close to and separated from the existing segment. SOLUTION: A clamp 18 is fitted to a rod 10 of a shield jack 9, and an arm part 19 is extended to fit a tail clearance measuring device 16 through shield frame contact mechanism 20. Operation release mechanism is provided between the contact mechanism 20 and the measuring device 16, and the measuring device 16 is made movable in the longitudinal direction of the shield frame 16. A probe 15 of the measuring device 16 is inserted in a tail clearance 12 and brought into close contact with the inner diameter face 13 of a shield frame 1 by the contact mechanism 20 between the arm part 19 and the measuring device 16. The probe 15 is brought into direct contact with the inner diameter face 13 of the shield frame 1 to measure a position, and the tail clearance 12 is obtained from the moving quantity of the probe 15.

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 a shield machine, and more particularly to a tail clearance measuring device for a shield machine capable of automatically measuring the tail clearance. is there.

[0002]

2. Description of the Related Art Conventionally, shield excavators have been used to excavate tunnels in the soil.

The shield machine, as shown in FIG.
A disk-shaped cutter 2 is rotatably mounted on a distal end surface of a substantially cylindrical shield frame 1 via a driving device 3 such as a motor, gears 4 and 5, and the like. Excavation, shield frame 1
By the segment assembly device (not shown) provided inside
A circular arc-shaped segment 7 made of concrete or the like is assembled in a digging pit 6 excavated by the cutter 2 to form a concrete tunnel 8, and a shield jack 9 provided inside the shield frame 1. Thereby, the reaction force is supported at the tip of the existing portion of the tunnel 8,
The shield frame 1 is propelled.

In the drawings, reference numeral 10 denotes a rod portion of the shield jack 9, and reference numeral 11 denotes a shoe portion of the shield jack 9.

In the shield machine described above, the outer diameter of the tunnel 8 or the existing segment 7 is set so as to be slightly smaller than the inner diameter of the shield frame 1, and the gap between the shield frame 1 and the existing segment 7 is set. A clearance (tail clearance 12) is formed, so that the shield frame 1 is deformed by earth pressure or the like, the assembled segment 7 is not a perfect circle, or the shield frame 1 is bent by a curve or the like. In the case where the shield frame 1 approaches one side, the shield frame 1 is prevented from interfering with the tunnel 8 or the existing segment 7 so that the shield frame 1 cannot be excavated.

Then, during the excavation, the tail clearance 1
If 2 is smaller than the allowable value, the tail clearance 12 is adjusted by changing the direction of the shield frame 1 or by inserting a segment having a shape different from that of the normal segment 7. I try to return to.

Conventionally, the measurement of the tail clearance 12 between the shield frame 1 and the existing segment 7 has been performed by an operator manually measuring four points such as upper, lower, left and right using a ruler.

[0008]

However, the means for manually measuring the tail clearance using a ruler has the following problems.

That is, it is difficult for an operator to manually measure the tail clearance 12 by using a ruler. In particular, when the diameter of a shield excavator is increased as in recent years, it is only necessary to reach the measurement point. But it takes a lot of time.

When the tail clearance 12 is measured manually by using a ruler, it is impossible to constantly monitor the tail clearance 12, and the change in the tail clearance 12 during propulsion is continuously monitored. I couldn't monitor it.

The present invention has been made in view of the above circumstances, and has as its object to provide a tail clearance measuring device of a shield machine capable of automating the measurement of tail clearance.

[0012]

According to the present invention, the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7 are provided.
And the tail clearance 1 between them by direct contact
A tail of a shield machine, wherein a tail clearance measuring device 16 having a tail clearance measuring element 15 capable of directly measuring 2 is attached to a moving device 17 which can move toward and away from the front end of the existing segment 7. It is related to a clearance measuring device.

In this case, the tail clearance measuring device 16 is moved in the radial direction 23 of the shield frame 1 with respect to the measuring portion mounting base 31 and the measuring portion mounting base 31 which is disposed in contact with the inner diameter surface 13 of the shield frame 1. A tail clearance measuring element 15 that is disposed so as to be able to move, a measuring element moving elastic mechanism 38 for urging the tail clearance measuring element 15 toward the shield frame 1 or the segment 7 with respect to the measuring section mounting base 31; Clearance gauge 1
A stylus return device 39 that returns the 5 to the side opposite to the stylus moving elastic mechanism 38, and a tail clearance measuring unit 40 that directly measures the tail clearance 12 by the amount of movement of the tail clearance stylus 15 It may be provided.

The tail clearance measuring device 16
A tail clearance measuring unit main body 35 that is arranged in contact with the inner diameter surface 13 of the shield frame 1, and a swing arm 45 pivotally supported by the tail clearance measuring unit main body 35 so as to be swingable and having a tail clearance measuring element 15 attached to a tip end. ,
46, a tracing stylus return device 55 which constantly urges the swing arms 45, 46 to swing toward the shield frame 1, and the swing arms 45, 46 when pushed by the front end of the segment 7. A damper member 56 that swings to the side and a tail clearance measuring unit 40 that directly measures the tail clearance 12 based on the swing amount of the swing arms 45 and 46 may be provided.

Further, the tail clearance measuring device 16
A tail clearance measuring unit main body 35 that is arranged in contact with the inner diameter surface 13 of the shield frame 1, and a swing arm 45 pivotally supported by the tail clearance measuring unit main body 35 so as to be swingable and having a tail clearance measuring element 15 attached to a tip end. ,
46, a tracing stylus return device 55 which constantly urges the swing arms 45, 46 to swing toward the shield frame 1, and the swing arms 45, 46 when pushed by the front end of the segment 7. A damper member 56 that swings to the side and a tail clearance measuring unit 64 that directly measures the tail clearance 12 based on the angle at which the swing arms 45 and 46 swing may be provided.

Also, the tail clearance measuring device 16
Tail clearance measuring element 1 attached to rotating body 65
5 is directly rotated to contact the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7, and the tail clearance 12 is directly measured by the rotation angle of the tail clearance measuring element 15. And a tail clearance measuring unit 68 such as a rotary encoder.

A tail clearance measuring device 16 is provided between the tail clearance measuring device 16 and the moving device 17.
May be provided with a shield frame close-contact mechanism 20 for bringing the shield frame into close contact with the inner diameter surface 13 of the shield frame 1.

Further, between the tail clearance measuring device 16 and the moving device 17, a tail clearance measuring device 1 is provided.
6 may be moved in the front-back direction 32 of the shield frame 1 so as to include an operation release mechanism 28 that can be separated from the existing segment 7.

According to the above means, the following effects can be obtained.

The tail clearance measuring device 16 is moved closer to the front end of the existing segment 7 by the moving device 17 so that the inner surface 13 of the shield frame 1 can be moved.
The tail clearance measuring element 15 is brought into direct contact with both the outer diameter surface 14 of the existing segment 7 and the tail clearance 12 between them.

In this case, the measuring unit mounting base 31 is arranged in contact with the inner diameter surface 13 of the shield frame 1, and the tail clearance measuring element 15 is attached to the measuring unit mounting base 31 by the measuring element moving elastic mechanism 38. And the tail clearance measuring element 15 is returned to the side opposite to the elastic element 38 for moving the measuring element by the measuring element return device 39. The tail clearance 12 may be directly measured by the tail clearance measuring unit 40 based on the movement amount of the distance 15.

Also, the tail clearance measuring unit main body 35 is arranged in contact with the inner diameter surface 13 of the shield frame 1 and the damper member 56 is pushed in by the front end of the segment 7, so that the measuring element return device 55 allows the shield frame 1
Swing arms 45, 46 constantly biased to swing to the side
May be swung to the shield frame 1 side, and the tail clearance 12 may be directly measured by the tail clearance measuring unit 40 based on the swing amount of the swing arms 45 and 46 at this time.

The tail clearance measuring unit main body 35 is placed in contact with the inner diameter surface 13 of the shield frame 1 and the damper member 56 is pushed in by the front end of the segment 7, so that the measuring element return device 55 allows the shield frame 1
Swing arms 45, 46 constantly biased to swing to the side
May be swung toward the shield frame 1, and the tail clearance 12 may be directly measured by the tail clearance measuring unit 64 based on the swing angle of the swing arms 45 and 46 at this time.

The tail clearance measuring element 15 attached to the rotating body 65 is
To make contact with the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7, and a tail clearance measuring unit 68 such as a rotary encoder depending on the rotation angle of the tail clearance measuring element 15 at this time.
, The tail clearance 12 may be directly measured.

The tail clearance measuring device 16 may be brought into close contact with the inner diameter surface 13 of the shield frame 1 by a shield frame contact mechanism 20 provided between the tail clearance measuring device 16 and the moving device 17.

Further, the tail clearance measuring device 16 is moved in the front-rear direction 32 of the shield frame 1 by an operation release mechanism 28 provided between the tail clearance measuring device 16 and the moving device 17 so that the existing segment 7 can be moved. The measurement of the tail clearance 12 may be stopped by separating the tail clearance 12.

As described above, the tail clearance measuring element 1
By providing the tail clearance measuring device 16 provided with 5, the measurement of the tail clearance 12 can be automated.

Further, since the tail clearance measuring device 16 is mounted on the existing moving device 17 such as a shield jack or a dedicated cylinder, the mounting is simple, and processing such as embedding in the shield frame 1 is performed. The shield frame 1 can be mounted easily and at an arbitrary position without causing any adverse effect on the shield frame 1 due to the mounting.

The tail clearance 12 is measured by bringing the tail clearance measuring element 15 into direct contact with the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7. Since the reliability as a means is high, and the direct distance data is obtained, the work of converting the data is not required, and errors are prevented from entering at the time of the conversion, and the highly accurate detection result can be obtained. Obtainable.

The tail clearance 12 is continuously measured except when the moving device 17 such as the shield jack 9 or a cylinder (not shown) is temporarily retracted in order to incorporate a new segment 7 before the existing segment 7. It is possible to keep it.

When it is desired to interrupt the continuous measurement of the tail clearance 12, the tail clearance measuring device 16 is moved in the front-rear direction 32 of the shield frame 1 by the operation release mechanism 28 so as to be separated from the existing segment 7. You can also do so.

[0032]

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

FIGS. 1 to 3 show a first embodiment of the present invention.

Since the basic structure of the shield machine is the same as that of FIG. 9, reference will be made to FIG. 9 as necessary, and the same parts will be denoted by the same reference numerals. Omitted.

In the present invention, there is provided a tail clearance measuring element 15 which can directly contact both the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7 to directly measure the tail clearance 12 therebetween. The feature is that the tail clearance measuring device 16 is attached to a moving device 17 that can move close to and away from the front end of the existing segment 7.

As the moving device 17, a dedicated cylinder or the like may be newly provided inside the shield frame 1, or the existing shield jack 9 may be used as it is.

In this embodiment, for example, the moving device 17
In the case where the shield jack 9 is used, a clamp 18 is attached to a rod portion 10 of the shield jack 9 (in the drawing, the rod portion 10 may be used, but the shoe portion 11 may be used). 19, the tail clearance measuring device 16 is attached to the tip of the arm 19.

At this time, between the arm 19 and the tail clearance measuring device 16, a shield frame contact mechanism 20 for bringing the tail clearance measuring device 16 into close contact with the inner diameter surface 13 of the shield frame 1 may be provided.

The shield frame contact mechanism 20 includes, for example, a shaft support 22 attached to the tip of the arm 19 via a position adjustment plate 21 so as to be adjustable in position, and the shaft support 22 provided with the shield frame 1. A guide shaft 24 inserted and supported so as to be slidable in a substantially radial direction 23;
Support plate 2 for holding both ends of bracket 4 via bracket 25
6 and an elastic body 27 such as a spring that biases the guide shaft 24 and the support plate 26 interposed between the guide shaft 24 and the shaft support 22 toward the shield frame 1.

Further, between the arm 19 and the tail clearance measuring device 16 (in the present embodiment, the shield frame contact mechanism 20 and the tail clearance measuring device 16
), The tail clearance measuring device 16 is moved in the front-back direction 32 of the shield frame 1,
An operation release mechanism 28 that can be separated from the existing segment 7 may be provided.

The operation release mechanism 28 includes, for example, an operation release mechanism main body 30 having a guide body 29 attached to the support plate 26 of the shield frame contact mechanism 20, and a tail clearance measuring device guided by the guide body 29. 1
6, a guide shaft 33 for moving the L-shaped measuring section mounting base 31 in the front-rear direction 32 of the shield frame 1, and a measuring section mounting base 3 extending and contracting in the front-rear direction 32 of the shield frame 1.
1 is constituted by a release driving device 34 such as a cylinder capable of moving the unit 1 in the front-back direction 32.

The tail clearance measuring device 16 fixes the measuring unit mounting table 31 attached to the distal end of the guide shaft 33 and in contact with the inner diameter surface 13 of the shield frame 1 and the tail clearance measuring element 15. The tail clearance measuring unit main body 35 movably disposed in the radial direction 23 of the shield frame 1 with respect to the measuring unit mounting base 31, and the tail clearance measuring unit main body 35 is moved from the measuring unit mounting base 31 in the radial direction. An elastic body 36 such as a spring for urging the probe 23 to move away from the sensor 23 and an elastic mechanism 38 for moving the measuring element comprising a guide rod 37 and the like.
And a measuring element return device 39 such as a cylinder capable of moving the tail clearance measuring section main body 35 toward the measuring section mounting base 31 and the tail clearance 12 by the moving amount of the tail clearance measuring section main body 35 or the tail clearance measuring element 15. It comprises a tail clearance measuring unit 40 such as a potentiometer for measuring.

In the figure, reference numeral 41 denotes a bellows provided between the operation release mechanism main body 30 and the measuring section mounting base 31, and reference numeral 42 denotes a bellows provided between the measuring section mounting base 31 and the tail clearance measuring section main body 35. It is.

Next, the operation will be described.

The process of constructing a tunnel while the shield machine is excavating is the same as that of FIG. 9 and will not be described.

In the present embodiment, when the tail clearance 12 between the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7 is measured, a moving device 17 is used as a cylinder (not shown). Moves the cylinder to extend the cylinder, thereby moving the moving device 17 such as a cylinder.
The tail clearance measuring device 16 attached to the vehicle through a clamp 18 and an arm portion 19 is brought close to the front end of the existing segment 7 so that the tail clearance measuring element 15 of the tail clearance measuring device 16 is inserted into the tail clearance 12. To

When the existing shield jack 9 is used as the moving device 17 as it is, the shield jack 9 is usually extended so that the front end of the existing segment 7 supports the reaction force. Therefore, the tail clearance measuring element 15 of the tail clearance measuring device 16 set on the shield jack 9 is naturally inserted into the tail clearance 12, so that this operation is not necessary.

As described above, when the tail clearance measuring element 15 of the tail clearance measuring device 16 is inserted into the tail clearance 12, the arm 1
9 and the tail clearance measuring device 16 are provided with a shield frame contact mechanism 20 provided between the tail clearance measuring device 16 and the inner surface 1 of the shield frame 1.
3

That is, the shaft supporting portion 2 attached to the tip of the arm portion 19 via the position adjusting plate 21 so as to be position adjustable.
An elastic body 27 such as a spring is interposed between the guide shaft 2 and the guide shaft 24 slidably and substantially slidably supported by the shaft support 22 in the radial direction 23 of the shield frame 1.
4 and the support plate 26 are urged toward the shield frame 1 so that the tail clearance measuring unit main body 35 of the tail clearance measuring device 16 attached to the support plate 26 via the operation release mechanism 28 causes the inner diameter surface of the shield frame 1 to move. 13.

Thus, the tail clearance measuring device 1
In a state in which the tail clearance measuring unit body 35 of 6 is in close contact with the inner diameter surface 13 of the shield frame 1, the measuring element return device 3 such as a cylinder of the tail clearance measuring device 16
9, the tail clearance measuring unit main body 35 is moved toward the measuring unit mounting table 31 side, and the tail clearance measuring element 15 attached to the tail clearance measuring unit main body 35 is moved to the inner surface 13 of the shield frame 1.
And the position is measured by a tail clearance measuring unit 40 such as a potentiometer.

Next, the tail clearance measuring device 16
Release the pressure of the probe return device 39 such as the cylinder
An elastic body 36 such as a spring of the measuring element moving elastic mechanism 38 is activated, and the tail clearance measuring unit main body 35 is attached to the measuring unit mounting base 31 in the radial direction 23 by the elastic force of the elastic body 36 such as the spring. Then, the tail clearance measuring element 15 attached to the tail clearance measuring section main body 35 is brought into direct contact with the outer diameter surface 14 of the existing segment 7, and its position is measured by the tail clearance measuring section 40 such as a potentiometer.

In this manner, the tail clearance 12 is obtained based on the difference between the positions measured by the tail clearance measuring unit 40 such as a potentiometer, that is, the amount of movement of the tail clearance measuring element 15.

As described above, according to the present embodiment, the measurement of the tail clearance 12 can be automated by providing the tail clearance measuring device 16 having the tail clearance measuring element 15.

The tail clearance measuring device 1 is connected to a moving device 17 such as an existing shield jack 9 or a cylinder (not shown) via a clamp 18 and an arm portion 19.
6, the mounting is easy, and the mounting can be easily and arbitrarily performed without any processing such as embedding in the shielding frame 1. Therefore, the mounting of the shielding frame 1 is adversely affected. Can be prevented.

Further, the tail clearance 12 is measured by bringing the tail clearance measuring element 15 into direct contact with the inner diameter surface 13 of the shield frame 1 and the outer diameter surface 14 of the existing segment 7. Since the reliability as a means is high, and the direct distance data is obtained, the work of converting the data is not required, and errors are prevented from entering at the time of the conversion, and the highly accurate detection result can be obtained. Obtainable.

The tail clearance 12 is continuously measured except when the moving device 17 such as the shield jack 9 or a cylinder (not shown) is temporarily retracted in order to incorporate a new segment 7 before the existing segment 7. It is possible to keep it.

When it is desired to interrupt the continuous measurement of the tail clearance 12, the release driving device 34 such as a cylinder provided in the operation releasing mechanism 28 is contracted to move the tail clearance measuring device 16 to the shield frame 1. In the fore-and-aft direction 32 to be separated from the existing segment 7.

Further, the stylus moving elastic mechanism 38 and the stylus returning device 3 constituting the tail clearance measuring device 16 are provided.
By accommodating the tail clearance measuring unit 9 and the tail clearance measuring unit 40 in the box-shaped tail clearance measuring unit main body 35, it is possible to achieve excellent environmental resistance.

The measuring element moving elastic mechanism 38 and the measuring element return device 39 are configured to bias the tail clearance measuring element 15 toward the inner diameter surface 13 of the shield frame 1 with the measuring element moving elastic mechanism 38. Alternatively, the tracing stylus return device 39 may be configured to move the tail clearance tracing stylus 15 toward the outer diameter surface 14 of the segment 7.

FIGS. 4 and 5 show a tail clearance measuring device 16 according to a second embodiment of the present invention.

The tail clearance measuring device 16 according to the present embodiment is as described below.

That is, the box-shaped tail clearance measuring unit main body 3 which is arranged in contact with the inner diameter surface 13 of the shield frame 1
5, two rotation center pins 43 and 44 extending in the tangential direction of the shield frame 1 are provided at a distance in the radial direction 23 of the shield frame 1. The intermediate portions of the pair of swing arms 45 and 46 extending in the direction 32 are pivotally supported, respectively, and the rotation center pin is provided between the front and rear ends of the pair of swing arms 45 and 46. Connecting links 47 and 48, which are parallel to a straight line connecting between 43 and 44, are pivoted by pivoting pins 49 to 52 arranged at an interval equal to the interval between the rotation center pins 43 and 44 to form a parallelogram link. Form the structure.

Then, a connecting link 47 on the tip end side of the pair of swing arms 45 and 46 protruding outward from an opening formed in the tail clearance measuring unit main body 35.
The tail clearance measuring element 15 is attached to the end of the shield arm near the shield frame 1, and the wide end 53 is formed at the rear end of the swing arm 46 remote from the shield frame 1. One pressing surface 54 inclined with respect to the radial direction 23 and the front-back direction 32 is formed.

Further, between the wide portion 53 and the surface of the tail clearance measuring section main body 35 on the side opposite to the shield frame 1, the distal ends of the pair of swing arms 45, 46 are swung toward the shield frame 1. A tracing stylus return device 55 such as a spring to be moved is interposed, and a pair of swing arms 45 and 46 are additionally provided.
The tail clearance measuring unit 40 such as a potentiometer is interposed between the end of the connecting link 48 on the rear end side on the shield frame 1 side and the surface of the tail clearance measuring unit main body 35 on the shield frame 1 side.

Further, the tail clearance measuring unit main body 35
The main body 57 of the elastic rod-shaped damper member 56 is
The damper member 56 is disposed so as to be movable in the front-rear direction 32 of the shield frame 1 and is provided between the flange 58 formed on the main body 57 of the damper member 56 and the insertion port forming portion 59 of the shield frame 1 in the protruding direction. An elastic mechanism 60 for returning a damper member such as a biasing spring is interposed, and a roller follower 62 that rolls along the pressing surface 54 is pivotally attached to the end of the rod portion 61 of the damper member 56.

Reference numeral 63 denotes an elastic body such as a spring interposed between the main body 57 of the damper member 56 and the rod 61 for moving the damper member 56 in and out.

The tail clearance measuring device 16 of the present embodiment applies a force to the damper member 56,
Is pushed toward the inside of the tail clearance measuring unit main body 35 against the damper member returning elastic mechanism 60, the roller follower 62 pivotally attached to the end of the rod portion 61 pushes the pressing surface 54, so that the roller The swing arm 4 which is pressed by the follower 62 on the pressing surface 54 to form a parallelogram link structure
5 and 46 swing upward as shown by the imaginary line in FIG. 4, and the tail clearance measuring element 15
4 can be contacted.

Conversely, when the force applied to the damper member 56 is released, the elastic force of the damper member returning elastic mechanism 60 causes the damper member 56 to protrude from the tail clearance measuring unit main body 35 to the outside, and a spring or the like. The swing arms 45 and 46 constituting the parallelogram link structure swing downward as shown by the solid line in FIG.
The tail clearance measuring element 15 can contact the inner diameter surface 13 of the shield frame 1. At this time, since the parallelogram link structure is employed, the tail clearance measuring element 15 is translated while being directed in the front-rear direction 32.

For this reason, while the moving device 17 such as the existing shield jack 9 and the cylinder (not shown) is in the contracted state, the swing arms 45 and 46 swing downward as shown by the solid lines in FIG. The tail clearance measuring element 15 comes into contact with the inner diameter surface 13 of the shield frame 1.

On the other hand, the moving device 17 such as the existing shield jack 9 or a cylinder (not shown) is extended to move the damper member 56 of the tail clearance measuring device 16 against the front end of the existing segment 7, and the damper member 56 is moved. When the swing arm 45 or 46 is pushed toward the inside of the tail clearance measuring unit main body 35, the swing arm 45 or 46 swings upward as shown by a virtual line in FIG. It comes into contact with the outer diameter surface 14.

Therefore, the tail clearance measuring section 40 such as a potentiometer causes the tail clearance measuring section 40 such as a potentiometer to move depending on the movement amount of the tail clearance measuring element 15 at this time.
Is measured. At this time, the tail clearance measuring device 16 is kept in close contact with the inner diameter surface 13 of the shield frame 1 by the shield frame contact mechanism 20, so that the measurement reference position is prevented from being changed. Accurate measurement becomes possible.

Further, by using the damper member 56 without using a normal rod-shaped member, it is possible to reduce the impact when the damper member 56 is pressed against the front end of the existing segment 7. .

Except for the above, it has the same configuration as that of the above embodiment, and can obtain the same operation and effect.

FIG. 6 shows a tail clearance measuring device 16 according to a third embodiment of the present invention. As shown in FIG. 4, a connecting link 48 on a rear end side of a pair of swing arms 45 and 46, as shown in FIG. Of the shield frame 1 side end,
Instead of interposing a tail clearance measuring unit 40 such as a potentiometer between the tail clearance measuring unit main body 35 and the surface of the shield frame 1 side, the rotation center pin 4 is used.
A tail clearance measuring section 64 such as a rotary encoder is attached to one of the three or 44, and the tail clearance 12 is directly measured by the rotation angle of the rotary encoder.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

FIGS. 7 and 8 show a tail clearance measuring device 16 according to a fourth embodiment of the present invention, in which an axis is directed in a tangential direction of the shield frame 1 and a tail clearance measuring unit main body 35 is moved. Shield frame 1
The tail clearance measuring element 15 is attached to a cylindrical rotating body 65 attached so as to be in contact with the inner diameter surface 13 of the rotary shaft, and a rotary spring with a return spring 66 fixed to the tail clearance measuring unit main body 35 is attached to the cylindrical rotating body 65. Actuator 67 (rotary actuator 6 without return spring 66)
7, a return spring 66 may be provided separately), and a tail clearance measuring unit 68 such as a rotary encoder is connected. Directly contact the inner diameter surface 13 of the existing segment 7 and the outer diameter surface 14 of the existing segment 7, and adjust the tail clearance 12 according to the rotation angle of the rotary encoder.
Is measured directly.

Except for the above, the configuration is the same as that of the above embodiment, and the same operation and effect can be obtained.

It should be noted that the present invention is not limited to only the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.

[0079]

As described above, the tail clearance measuring apparatus for a shield machine according to the present invention has an excellent effect that the measurement of the tail clearance can be automated.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a side sectional view of a tail clearance measuring device according to a second embodiment of the present invention.

5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a side sectional view of a tail clearance measuring device according to a third embodiment of the present invention.

FIG. 7 is a side view of a tail clearance measuring device according to a fourth embodiment of the present invention.

FIG. 8 is a view taken in the direction of arrows VIII-VIII in FIG. 7;

FIG. 9 is a schematic side sectional view of the shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield frame 7 Segment 12 Tail clearance 13 Inner diameter surface 14 Outer diameter surface 15 Tail clearance measuring element 16 Tail clearance measuring device 17 Moving device 20 Shield frame adhesion mechanism 23 Radial direction 28 Operation release mechanism 31 Measuring unit mounting base 32 Front and rear 35 Tail Clearance measurement unit main body 38 Measurement element elastic mechanism 39 Measurement element return device 40 Tail clearance measurement unit 45, 46 Swing arm 55 Measurement element return device 56 Damper member 64 Tail clearance measurement unit 65 Rotating body 67 Rotary actuator 68 Tail clearance measurement Department

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuyuki Tobita 11-1 Kitahama-cho, Chita-shi, Aichi Prefecture Harima Ishikawajima Heavy Industries, Ltd.

Claims (7)

[Claims] 1. An inner diameter surface (1) of a shield frame (1).
3) and an outer diameter surface (14) of the existing segment (7) in direct contact with the tail clearance (12) therebetween.
A tail clearance measuring device (16) having a tail clearance measuring element (15) capable of directly measuring the distance is attached to a moving device (17) that can move close to and away from the front end of the existing segment (7). Tail clearance measuring device for shield machine. 2. A tail clearance measuring device (16).
Are mounted on the measuring section mounting base (31), which are arranged in contact with the inner diameter surface (13) of the shield frame (1);
1) with respect to the radial direction (2) of the shield frame (1).
3) The tail clearance measuring element (15) movably arranged in (3) and the tail clearance measuring element (15) with respect to the measuring section mounting base (31) toward the shield frame (1) or the segment (7). A stylus moving elastic mechanism (38) to be energized, and a stylus returning device (39) for returning the tail clearance measuring element (15) to a side opposite to the stylus moving elastic mechanism (38); The tail clearance (1) depends on the amount of movement of the tail clearance measuring element (15).
Tail clearance measurement unit (4) that directly measures 2)
The tail clearance measuring device for a shield machine according to claim 1, further comprising: (0). 3. A tail clearance measuring device (16).
Are pivotally supported by a tail clearance measuring unit main body (35) and a tail clearance measuring unit main body (35) which are arranged in contact with an inner diameter surface (13) of the shield frame (1), and a tail clearance measurement is provided at a tip end. A swing arm (45) (46) to which the child (15) is attached, and a measuring element return device (55) that constantly urges the swing arm (45) (46) to swing toward the shield frame (1). ), A damper member (56) for swinging the swing arm (45) (46) toward the shield frame (1) when pushed by the front end of the segment (7), and a swing arm (45) (4).
The tail clearance measuring device for a shield machine according to claim 1, further comprising a tail clearance measuring unit (40) for directly measuring the tail clearance (12) by the swing amount of (6). 4. A tail clearance measuring device (16).
Are pivotally supported by a tail clearance measuring unit main body (35) and a tail clearance measuring unit main body (35) which are arranged in contact with an inner diameter surface (13) of the shield frame (1), and a tail clearance measurement is provided at a tip end. A swing arm (45) (46) to which the child (15) is attached, and a measuring element return device (55) that constantly urges the swing arm (45) (46) to swing toward the shield frame (1). ), A damper member (56) for swinging the swing arm (45) (46) toward the shield frame (1) when pushed by the front end of the segment (7), and a swing arm (45) (4).
6) The tail clearance (1
Tail clearance measurement unit (6) that directly measures 2)
The tail clearance measuring device for a shield machine according to claim 1, further comprising: (4). 5. A tail clearance measuring device (16).
However, by directly rotating the tail clearance measuring element (15) attached to the rotating body (65), the inner diameter surface (13) of the shield frame 1 and the outer diameter surface (1) of the existing segment (7) are changed.
4) Rotary actuator (67) to contact with
The tail clearance of a shield machine according to claim 1, further comprising: a tail clearance measuring unit (68) for directly measuring the tail clearance (12) by a rotation angle of the tail clearance measuring element (15). Measuring device. 6. A tail clearance measuring device (16) is provided between a tail clearance measuring device (16) and a moving device (17).
Frame contact mechanism (20)
The tail clearance measuring device for a shield machine according to any one of claims 1 to 5, further comprising: 7. A tail clearance measuring device (16) is provided between the tail clearance measuring device (16) and the moving device (17) in the front-rear direction (3) of the shield frame (1).
The tail clearance measuring device for a shield machine according to any one of claims 1 to 6, further comprising an operation release mechanism (28) capable of moving to (2) and separating from the existing segment (7).