JPH07233695A - Self-traveling tail-clearance measuring device - Google Patents

Abstract

PURPOSE:To directly and precisely measure a tail-clearance. CONSTITUTION:An annular groove 7 is formed in a predetermined part of the inner peripheral surface of a skin plate 2 facing a segment 5, along a crossing line between the axis H of a shield excavator l and a plane orthogonal thereto. A self-traveling bed 9 which is slidable in the peripheral direction of the inner peripheral surface of the skin plate 2 is set can the inside of the annular groove 7, and a distance meter 10 is attached to the self-traveling bed 9 in a direction toward the axis H. An annular guide member 12 is provided on the inside of the groove 7 along a predetermined depth from the inner surface of the skin plate 2, and the self-traveling bed 9 is slid along the predetermined depth inside of the annular groove 7 while the bed 9 is made into contact with the annular guide member 12 through the intermediary of posture control means 11. Preferably, annular recesses 14 are formed in inner opposite surfaces of the groove 7 as viewed from the sliding direction of the self-traveling bed 9, and a plurality of protrusions 15 adapted to be slidably fitted in the annular recesses 14 are formed on the bed 9.

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 in shield tunnel construction, and more particularly, a self-propelled tail for directly measuring the tail clearance by sliding a distance meter on the inner peripheral surface of the shield machine. The present invention relates to a clearance measuring device.

[0002]

2. Description of the Related Art In tunnel construction work using excavation by a shield machine, every time the ground is excavated a certain distance,
As shown in FIG. 4, a shield segment 5 to be an inner wall of a tunnel after excavation is assembled inside a rear end of a cylindrical shield skin plate 2 (hereinafter, simply referred to as a skin plate) which is an outer peripheral wall of a shield machine 1. . Normally, the shield segment 5 has a ring shape formed from multiple segment pieces, so for quality control and the next segment assembly, the shape of the segment ring assembled this time and the tail clearance between the outer surface of the segment ring and the inner surface of the skin plate are used. It is necessary to measure the minute gap called.

Conventionally, the shape of the segment ring and the tail clearance are measured by, for example, as shown in FIG. 4, a distance sensor 6 is attached to the tip of the erector 4, which is a segment piece handling device, and the erector 4 is arranged along the inner surface of the segment. The shape of the inner surface of the segment was obtained by rotating, and the tail clearance was obtained by calculation from the shape of the inner surface of the segment, the inner diameter of the shield machine and the thickness of the segment.

[0004]

However, the method of mounting the distance sensor at the tip of the erector and measuring the erector is effective in the case of an erector having a high mechanical precision such as used in an automatic assembly apparatus. In the case of a general erector, which has a relatively low accuracy, the center of rotation is eccentric with the rotation, so that the obtained inner shape of the segment is not always accurate, and as a result, the tail clearance cannot be calculated accurately.

Further, since the tail clearance is indirectly obtained from the shape of the inner surface of the segment, the deformation of the skin plate due to earth pressure or the like cannot be grasped, and it may not be possible to obtain a precise tail clearance. If you fix the assembled segment without adjusting the tail clearance precisely,
When the next segment assembly is performed after excavating a certain distance, the required clearance cannot be secured between the inner surface of the skin plate advanced by a certain distance and the next segment outer surface, making it difficult to assemble the segment as planned. There's a problem.

Therefore, an object of the present invention is to provide a measuring device for directly and precisely measuring the tail clearance.

[0007]

With reference to the embodiment of FIG. 1, a self-propelled tail clearance measuring device of the present invention is a shield that is assembled on the inner surface of a skin plate 2 of a shield machine 1 and on the inside of the skin plate 2. In a tail clearance measuring device between the outer surface of the segment 5 and a predetermined portion of the inner peripheral surface of the skin plate 2 which should face the segment 5, the tail clearance measuring device is formed along a line of intersection with a plane orthogonal to the axis H of the shield machine 1. Annular groove 7, and an annular guide member provided inside the annular groove 7 along the constant depth from the inner surface of the skin plate 2.
12, a self-propelled table 9 that slides in the circumferential direction of the skin plate 2 while making contact with the annular guide member 12 via the attitude control means 11, and an axis H on a plane orthogonal to the axis H when the self-propelled table 9 slides. A distance meter 10 attached to the self-propelled table 9 in the direction of the arrow, and driving means for driving the sliding of the self-propelled table 9 at a constant depth inside the annular groove 7.
16 and position detecting means 17 for detecting the position of the self-propelled table 9 in the circumferential direction of the inner peripheral surface of the skin plate 2.

Preferably, a pair of annular guide members 12 is provided on both inner side surfaces of the annular groove 7 when viewed from the sliding direction of the self-propelled table 9,
An annular recess 14 is formed in each annular guide member 12, and a plurality of protrusions 15 slidably fitted in the annular recess 14 are provided on the surface of the self-propelled table 9 facing the annular guide member 12, and each protrusion 15 corresponds to each protrusion 15. The attitude of the self-propelled table 9 at the time of sliding is controlled by fitting with the annular recessed portion 14.

[0009]

In order to measure the tail clearance in the plane orthogonal to the axis H, the annular groove 7 is formed on the inner peripheral surface of the skin plate 2 along the line of intersection with the orthogonal plane, and the distance meter 10 is provided inside the annular groove 7. The fixed self-propelled table 9 is arranged. An annular guide member 12 is provided inside the annular groove 7 along a certain depth from the inner surface of the skin plate 2, and the self-propelled table 9 is slid in the circumferential direction of the skin plate 2 while being in contact with the annular guide member 12. The distance between the moving rangefinder 10 and the inner peripheral surface of the skin plate 2 is kept constant. In the embodiment of FIG. 1 showing the shield construction method using the circular shield machine 1, the shape of the annular groove 7 is also a circumferential groove centered on the axis H. However, the present invention is not limited to the measurement by the circular shield construction method, and the tail clearance measurement by the multi-face shield construction method is also possible. FIG. 1 (A) shows a side view including the axis H of the shield machine 1, and FIG. 1 (B) shows an enlarged view of a portion of a dotted frame B. The range finder 10 may be, for example, a non-contact type range finder or a contact type range finder using a wave signal such as a light wave or an ultrasonic wave.

Further, in order to control the direction of the distance meter 10 during sliding, the self-propelled table 9 and the annular guide member 12 are brought into contact with each other through the attitude control means 11, and the attitude control means 11 causes the self-propelled table during sliding. 9 posture is controlled. In the embodiment of FIG. 1, provided on both side surfaces of the annular groove 7 when viewed from the sliding direction of the self-propelled table 9, in this case, an annular guide member 12 composed of an annular frame 19 having an U-shaped cross section and an annular recess 14 is provided. In this case, on the surface of the self-propelled table 9 facing each annular guide member 12, the attitude control means 11 composed of two protrusions 15 in this case are respectively provided, and the tire 13 at the tip of each protrusion 15 and the annular guide member.
The attitude of the self-propelled table 9 and the direction of the distance meter 10 during sliding are controlled by fitting the annular recessed portions 14 of 12 together. That is, referring to FIG. 1 (C) showing a sectional view of the annular groove 7, two tires 13 on the left and right are provided.
By fitting the annular recesses 14 on both side surfaces with each other, the attitude of the self-propelled table 9 viewed from the sliding direction is controlled. Further, referring to FIG. 1 (D) showing a side view of the annular groove 7, the two tires 13 in front and rear in the sliding direction and two points in the circumferential direction of the annular guide member 12 come into contact with each other so that they are viewed from the axial direction. The attitude of the self-propelled table 9 is controlled. Total 4
The direction of the range finder 10 can be controlled by the tire 13 of the book. However, the shape and position of the annular guide member 12 are not limited to the illustrated example,
For example, the self-propelled table 9 can be slid by providing an annular guide member 12 at the bottom of the annular groove 7. Also, the attitude control means 11 is not limited to the protrusion 15 or the protrusion 15 with the tire 13.

Since the position of the distance meter 10 in the direction of the axis H is determined by the position where the annular groove 7 is formed, if the position detecting means 17 detects the position of the self-propelled table 9 in the circumferential direction of the inner peripheral surface of the skin plate 2, The three-dimensional position on the inner peripheral surface of the skin plate 2 of the distance meter 10 is determined. Driving means for tire rotation motor
In the embodiment of FIG. 1 in which the self-propelled table 9 is slid as 16, the sliding distance of the self-propelled table 9 can be obtained from the diameter and the number of revolutions of the tire 13, so that it was obtained by surveying when assembling the shield machine 1, for example. The three-dimensional position of the self-propelled table 9 is determined from the shape of the annular groove 7, the drive start position of the self-propelled table 9, and the sliding distance. Drive means 16
By connecting the position measuring means 17 with the position measuring means 17, it is possible to move the self-propelled table 9 to a desired position and perform precise tail clearance measurement.

Thus, the "measuring device for directly and precisely measuring the tail clearance" which is the object of the present invention.
Can be achieved.

[0013]

EXAMPLE FIG. 2A shows an example of the present invention in which the self-propelled table 9 is driven by the rope 20 stretched inside the annular groove 7, and an enlarged view of a portion of a dotted line frame B is shown in FIG. ). One end and the other end of the rope 20 are respectively connected to two rope winding devices 21a and 21b fixed at different positions inside the annular groove 7, and a self-propelled table 9 is attached at a predetermined position between both ends. Rollers 22 are provided inside the annular groove 7 at required intervals, and the ropes 20 are stretched in the circumferential direction of the inner peripheral surface of the skin plate 2 by engagement with the rollers 22.
The self-propelled table 9 is slid in the circumferential direction by the pulling force of 21a or 21b. In this case, if the winding length of the rope 20 and the sliding distance of the self-propelled table 9 are made to correspond to each other, the fixed positions of the rope winding devices 21a and 21b and the rope 20 can be adjusted.
It is also possible to obtain the circumferential position of the self-propelled table 9 from the mounting position of the upper self-propelled table 9 and the winding length.

FIG. 3 shows an embodiment in which a range finder 18 is provided at a position inside the shield machine 1 on the face side of the front end face of the segment 5 and the inner surface shape of the skin plate 2 is obtained by the range finder 18. That is, a plurality of predetermined positions in a plane V ₀ perpendicular to the axis H of the shield machine 1, for example orthogonal planes V ₀ and the orthogonal plane V ₀ at intersections between shield jacks 3
The distance meter 18 is fixed in the above predetermined direction, and the distance to the inner surface of the skin plate 2 is measured by each distance meter 18. Each distance meter
The positions of a plurality of facing points on the inner surface of the skin plate 2 are calculated from the 18 fixed positions, the measuring direction, and the measuring distance, and the inner surface shape of the skin plate 2 is obtained from the positions of the plurality of facing points.
For example, the skin plate 2 that is relatively thin, such as about 10 cm, may be deformed by earth pressure in the ground, and if the accurate shape of the inner peripheral surface of the skin plate 2 and the tail clearance in the circumferential direction can be measured, the segment 5 will be highly accurate. The outer surface shape can be measured. The range finder 18 is a non-contact type or contact type range finder similar to the range finder 10.

As shown in FIG. 3 (B), a plurality of annular grooves 7 are formed at predetermined intervals, and a self-propelled table 9 having a distance meter 10 fixed therein is slid inside each annular groove 7 to tail clearance. S1, S2
If you measure, you can compare multiple tail clearances (S2-S
From 1), the inclination of the segment 5 in the direction of the axis H, that is, the inclination of the end face on the face side is obtained. Also, each tail clearance S
If the outer surface shape of the segment 5 at a plurality of sites separated from each other by a predetermined distance is obtained from the S1 and the inner surface shape of the skin plate 2 obtained by the distance meter 18, the three-dimensional shape of the outer surface of the segment 5 can be obtained. it can.

[0016]

As described in detail above, the self-propelled tail clearance measuring device of the present invention has a predetermined portion of the inner peripheral surface of the skin plate along a line of intersection with a plane orthogonal to the axis of the shield machine. An annular groove is formed, an annular guide member is provided along a certain depth of the annular groove, and a self-propelled table that slides in the circumferential direction of the skin plate while being in contact with the annular guide member via the attitude control means is provided in the annular groove. It is placed inside, and when the self-propelled table slides, the range finder is attached to face the axis on a plane orthogonal to the axis, and the tail clearance is measured while sliding the self-propelled table in the circumferential direction. Has a great effect.

(A) Since the tail clearance is directly measured, a precise tail clearance is required even when the skin plate is deformed. (B) The tail clearance can be measured with high accuracy by arbitrarily increasing the number of measurement points. (C) The measurement can be performed any number of times during the excavation operation, and the behavior after the assembly of the segments can be obtained in time series by performing the measurement a plurality of times. (D) It can be expected to be used for automation of shield tunnel construction by merging with the segment automatic assembly equipment. (E) In addition to the conventional circular shield construction method, it can be expected to be applied to a multi-face shield construction method such as 2 or 3 stations.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention.

FIG. 3 is an explanatory diagram of segment inclination measurement according to the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

1 Shield machine 2 Skin plate 3
Shield jack 4 Electa 5 Segment 6
Distance sensor 7 Annular groove 9 Self-propelled stand 10
Distance meter 11 Posture control means 12 Annular guide member 13
Tire 14 Annular recess 15 Protrusion 16
Drive means 17 Position detection means 18 Distance meter 19
Annular frame 20 Cable 21 Cable winding device 22
roller.

Claims (7)

[Claims] 1. In a tail clearance measuring device between a skin plate inner surface of a shield machine and a shield segment outer surface assembled inside the skin plate, the tail clearance measuring device is provided at a predetermined portion of the skin plate inner peripheral surface to be opposed to the segment. An annular groove formed along a line of intersection with a plane orthogonal to the axis of the shield machine, an annular guide member provided inside the annular groove along a certain depth from the inner surface of the skin plate, the annular guide member and posture A self-propelled table that slides in the circumferential direction of the skin plate while contacting through a control means, and is attached to the self-propelled table in a direction toward the axis on a plane orthogonal to the axis when the self-propelled table slides. Distance meter, driving means for driving the sliding of the self-propelled table at a constant depth inside the annular groove, and the self-moving means in the circumferential direction of the inner peripheral surface of the skin plate. Comprising comprising a position detecting means for detecting the position of the platform self-propelled tail clearance measuring device. 2. The measuring device according to claim 1, wherein a pair of the annular guide members is provided on both side surfaces inside the annular groove when viewed from the sliding direction of the self-propelled table, and an annular recess is formed in each of the annular guide members. And a plurality of protrusions slidably fitted to the annular recesses are provided on a surface of the self-propelled table facing the annular guide member.
A self-propelled tail clearance measuring device that controls the attitude of the self-propelled table when sliding by fitting the respective projections and the corresponding annular recesses. 3. The measuring device according to claim 2, wherein a tire that fits into the annular recess and rotates is provided at a tip of the protrusion,
The position detection means detects the position of the self-propelled table from the shape of the annular groove, the drive start position of the self-propelled table, and the sliding distance of the self-propelled table calculated from the diameter and rotation speed of the tire. Self-propelled tail clearance measuring device. 4. The self-propelled tail clearance measuring device according to claim 3, wherein the self-propelled table is slid by a rotation motor of the tire mounted on the self-propelled table. 5. The measuring device according to claim 1, 2 or 3,
A self-propelled cable provided with a rope stretched inside the annular groove, the self-propelled table is attached to the rope, and the self-propelled table is slid by the pulling force of a rope winding device connected to both ends of the rope. Type tail clearance measuring device. 6. The measuring device according to claim 1, 2, 3, 4 or 5, wherein a plurality of annular grooves are formed on an inner peripheral surface of the skin plate at a predetermined distance in the axial direction, and the predetermined period is set. Self-propelled tail clearance measuring device that seeks multiple tail clearances separated by a distance. 7. The measuring device according to claim 1, 2, 3, 4, 5 or 6, wherein a plurality of predetermined positions are provided inside the skin plate on a plane orthogonal to the axis on a facet side from the front end face of the segment. A distance meter is fixed in a predetermined direction on the plane, a distance to the inner surface of the skin plate is measured by each distance meter, and a plurality of positions on the inner surface of the skin plate are determined based on a fixed position, a measurement direction, and a measured distance of each distance meter. A self-propelled tail clearance measuring device that obtains the position of an opposing point and the shape of the inner surface of the skin plate.