JP6143330B2 - Roundness measuring device and roundness measuring method - Google Patents

Description

  The present invention relates to a roundness measuring device and a roundness measuring method for measuring the roundness of an inner peripheral surface of a segment assembled by a shield machine.

The shield machine assembles the segment tunnel by digging while assembling the segment into a cylindrical wall inside the tail portion.
On the inside of the tail part, the upper holding body is applied to the upper end of the inner peripheral surface of the segment assembled into a cylindrical wall shape, and the inner peripheral surface is applied by applying the lower holding body to the lower end of the inner peripheral surface of the segment. A perfect circle holding device that holds a perfect circle shape is provided (see Patent Document 1).
However, the roundness of the inner circumferential surface of the segment changes due to the influence of the relative positional relationship between the direction of the shield machine and the already assembled segment. It is difficult to maintain a perfect circular shape.
Therefore, conventionally, before and after the excavation work with the shield machine, data indicating the degree of distortion of the segment's inner peripheral surface with respect to the perfect circle shape was measured using a swing from the scaffold assembled by the worker on the premises. Is used as data for controlling the direction of excavation of the shield machine, or as data for performing segment assembly control.

JP 2000-213297 A

However, in the above-described conventional technique, it is necessary to perform measurement work by an operator in a state where the excavation operation is stopped at the time of measurement, so that it is difficult to obtain measurement data during excavation, which causes a reduction in measurement efficiency. There was a disadvantage.
In addition, if the inside of the segment has a large diameter, work at a high place is required, and if the inside of the segment has a small diameter, work in a narrow space is required, which places a heavy burden on the worker. There was a disadvantage.
Furthermore, in order to ensure the roundness of the inner peripheral surface of the segment, it is more preferable to control the shield machine based on the measured value of the roundness.
The present invention has been made in view of such circumstances, and an object of the present invention is to measure roundness which is advantageous in improving the measurement efficiency of roundness and reducing the burden on workers. It is in providing an apparatus and a roundness measuring method.

In order to achieve the above-mentioned object, the present invention applies an upper holding body to the upper end of the inner peripheral surface of a segment assembled into a cylindrical wall shape and applies a lower holding body to the lower end of the inner peripheral surface of the segment. A roundness measuring device for measuring the roundness of the inner circumferential surface of the segment assembled in the cylindrical wall shape, provided in a shield machine having a perfect circle holding device for holding the inner circumferential surface in a round shape. The upper holding body is applied to the upper end of the inner peripheral surface and the lower holding body is applied to the lower end of the inner peripheral surface, and is orthogonal to the axis of the shield machine. A first straight line L1 extending on a plane and orthogonal to the axial center and intersecting the upper holding body and the lower holding body when viewed from the axial direction is two opposite locations on the inner peripheral surface. The two intersecting points are designated as the first measurement point P1, the second A second measuring point P2 extends on the plane and is orthogonal to the axial center and the first straight line L1 and intersects the upper holding body and the lower holding body when viewed from the axial direction. When the two points where the straight line L2 intersects the two opposite locations on the inner peripheral surface are defined as the third measurement point P3 and the fourth measurement point P4, the straight line L2 is attached to the upper holding body, and from the axial direction. A first distance sensor that detects a distance from the first measurement point P1 along the first straight line L1 as a first distance D1, and the shaft center attached to the lower holding body. A second distance sensor that detects a distance from the second measurement point P2 along the first straight line L1 when viewed from the direction as a second distance D2, and the shaft attached to the upper holding body. viewed from center direction a distance from the third measurement point P3 along the second straight line L2 A third distance sensor for detecting a third distance D3, is attached to the lower retaining member, the distance from the fourth measurement point P4 along the second straight line L2 as viewed from the axial direction A fourth distance sensor for detecting the roundness of the inner peripheral surface based on the first to fourth distances D1 to D4 , In the first distance sensor, the second distance sensor, the third distance sensor, and the fourth distance sensor, the inner peripheral surface of the segment is a circle having a predetermined radius centered on the axis. In a state where the circumference extends and the upper holding body and the lower holding body are applied to the upper end and the lower end of the inner peripheral surface of the segment, Placed on the circumference of the same radius with dimensions smaller than the defined radius Characterized in that that.
The present invention also provides an upper holding body applied to the upper end of the inner peripheral surface of the segment assembled into a cylindrical wall shape, and the inner peripheral surface is secured by applying the lower holding body to the lower end of the inner peripheral surface of the segment. In a shield machine including a perfect circle holding device that holds a circular shape, the roundness measurement method for measuring the roundness of the inner peripheral surface of the segment assembled into the cylindrical wall shape, the upper end of the inner peripheral surface The upper holding body is applied to the lower end of the inner peripheral surface, and the lower holding body is applied to the lower end of the inner peripheral surface. The upper holding body extends on a plane orthogonal to the axis of the shield machine and the shaft. A first straight line L1 that is orthogonal to the center and intersects the upper holding body and the lower holding body when viewed from the axial direction is a first point that intersects two opposing points on the inner peripheral surface. The measurement point P1 and the second measurement point P2, and the plane And a second straight line L2 perpendicular to the axial center and the first straight line L1 and intersecting the upper holding body and the lower holding body when viewed from the axial direction is formed on the inner peripheral surface. The first measurement point along the first straight line L1 when viewed from the axial direction when two points intersecting the two opposite points are defined as a third measurement point P3 and a fourth measurement point P4. A distance between P1 and a first reference point set on the upper holding body is detected as a first distance D1, and the second measurement point along the first straight line L1 when viewed from the axial direction. The distance between P2 and the second reference point set on the lower holding body is detected as a second distance D2, and the third measurement along the second straight line L2 as viewed from the axial direction. detecting a distance between the third reference point that is set as a point P3 on the upper retaining member as the third distance D3, Viewed from Kijikukokoro direction detects the distance between the fourth reference point set in the second said along a straight line L2 of the fourth and the measurement point P4 the lower retaining member as a fourth distance D4 The roundness of the inner peripheral surface is calculated based on the first to fourth distances D1 to D4, and the first reference point, the second reference point, the third reference point, the first reference point, The reference point 4 is a state in which the inner peripheral surface of the segment extends on the circumference of a predetermined radius centered on the axis, and the upper holding body and the lower holding body are It is set so as to be located on the circumference of the same radius with a dimension smaller than the predetermined radius, centered on the axis center, in a state of being applied to the upper end and the lower end of the inner peripheral surface of the segment. and said that you are.

According to the present invention, in the state where the upper holding body is applied to the upper end of the inner peripheral surface and the lower holding body is applied to the lower end of the inner peripheral surface, the inner peripheral surface of the segment, the upper holding body, and The roundness of the inner peripheral surface was calculated based on the distance from the lower holding body.
Therefore, the roundness during excavation can be continuously obtained without stopping the excavation operation of the shield machine, which is advantageous in improving the measurement efficiency of the roundness. Further, since the measurement work by the worker is unnecessary, it is advantageous in reducing the physical burden on the worker.

1 is an overall view of a shield machine 10 on which a roundness measuring device according to an embodiment is mounted. It is explanatory drawing which shows the installation state of the roundness measuring device 70 of embodiment. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is a block diagram which shows the structure of the control system of the roundness measuring device 70 of embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a shield machine 10 on which a roundness measuring device 70 according to the embodiment is mounted, FIG. 2 is an explanatory view showing an installation state of the roundness measuring device 70, and FIG. 4 and 4 are block diagrams showing the configuration of the control system of the roundness measuring apparatus 70. FIG.

First, the shield machine 10 will be described.
As shown in FIG. 1, the shield machine 10 includes a front body portion 12, a tail portion (rear body portion) 14, a rear carriage 16, and the like. The front body portion 12 includes an excavation portion 12A, and thereafter And a rear chamber 12B provided on the side.

The excavation part 12A includes a cutter device 1202, an exterior wall (a front skin plate facing the inner wall 1802 of the tunnel 18) 1204, and the like.
The rear chamber 12B is a position behind the excavation unit 12A inside the front skin plate 1204, and a conveyor device (a soil removal device), a jack device, and the like (not shown) are arranged in the rear chamber 12B.
The cutter device 1202 is configured to excavate natural ground by rotating a disk-shaped cutter around an axis parallel to the excavation direction.
The conveyor device is configured to convey the earth and sand discharged by excavation of natural ground by the cutter device 1202 backward.
The jack device is configured to push the cutter device 1202 and the conveyor device in the digging direction by pressing the portion 20 of the segment 20 assembled in a cylindrical wall shape in the tunnel 18 excavated by the cutter device 1202 toward the rear in the digging direction. It is configured.

The tail portion 14 includes a skin plate (rear skin plate) 1402 facing the inner wall 1802 of the tunnel 18, and a perfect circle holding device 22 (see FIG. 2) described later is provided inside the rear skin plate 1402.
The skin plate 1402 has a cylindrical shape, and has an outer peripheral surface facing the inner wall 1802 of the tunnel 18 and an inner peripheral surface 1410 facing the outer peripheral surface and facing the outer peripheral surface 2002 of the segment 20.
The skin plate 1402 of the tail portion 14 is connected to the rear end portion in the digging direction of the exterior wall (front skin plate) 1204 of the excavating portion 12A so as to be bendable.

The rear carriage 16 operates the shield machine 10 and is provided behind the tail portion 14.
In the present embodiment, the rear carriage 16 includes a plurality of carriages 16A, 16B, 16C, and 16D. These carriages include a control unit for operating the excavation section 12A and the tail section 14, a drive source, an oil tank, and the like. Are distributed.
The rear carriage 16 is movably provided on a rail 19 extending in the longitudinal direction of the tunnel 18.

The segment 20 has a thickness extending in the radial direction of the tunnel 18, a length extending in the circumferential direction of the tunnel 18, a cylindrical outer peripheral surface 2002 disposed facing the inner wall 1802 of the tunnel 18, and And a cylindrical inner peripheral surface 2004 facing the center of the tunnel 18.
The segment 20 functions to support the inner wall 1802 by being annularly assembled to the inner wall 1802 of the tunnel 18 excavated by the shield machine 10, in other words, by being assembled in the mine.
A segment tunnel is constructed by assembling the segment 20 to the inner wall 1802.

As shown in FIGS. 2 and 3, the perfect circle holding device 22 includes a support frame 24, an upper holding body 26, a lower holding body 28, an upper extension device 30, and a lower extension device 32. It is configured.
The support frame 24 has a rectangular plate shape that extends in the horizontal direction at an intermediate portion in the height direction in the space inside the skin plate 1402 shown in FIG. 1, and the front trunk portion 12 of the shield machine 10 by an unillustrated attachment member. It is supported by.
The upper holding body 26 is formed in an arc shape along the upper end of the inner peripheral surface of the segment 20 when viewed from the axial center direction of the shield machine 10, and has the same radius as the radius of the inner peripheral surface 2004 of the segment 20. A contact surface 2602 having a cylindrical surface shape is provided, and the corresponding contact surface 2602 faces the upper end of the inner peripheral surface 2004 of the segment 20.
The lower holding body 28 is formed in an arc shape along the lower end of the inner peripheral surface 2004 of the segment 20 when viewed from the axial direction of the shield machine 10, and has the same radius as the inner peripheral surface 2004 of the segment 20. A contact surface 2802 having a cylindrical surface shape with a radius is provided, and the corresponding contact surface 2802 faces the lower end of the inner peripheral surface 2004 of the segment 20.

The upper telescopic device 30 is provided between both ends of the upper holding body 26 and the left and right side portions of the upper surface of the support frame 24. As the upper telescopic device 30 expands and contracts, the upper holding body 26 is moved in a direction in which the upper holding body 26 contacts and separates from the upper end of the inner peripheral surface 2004 of the segment 20.
The lower telescopic device 32 is provided between both ends of the lower holding body 28 and the left and right side portions of the lower surface of the support frame 24. When the lower expansion / contraction device 32 expands / contracts, the lower holding body 28 is moved in a direction in which the lower holding body 28 contacts / separates to the lower end of the inner peripheral surface 2004 of the segment 20.
Various conventionally known expansion and contraction devices such as a hydraulic jack can be used as the upper and lower expansion and contraction devices 30 and 32.

  The perfect circle holding device 22 extends the upper telescopic device 30 by applying the contact surface 2602 of the upper holding body 26 to the upper end of the inner peripheral surface 2004 of the segment 20 and by extending the lower telescopic device 32. The abutting surface 2802 of the lower holding body 28 is applied to the lower end of the inner peripheral surface 2004 of the segment 20 to support the vertical load applied to the segment 20 by earth pressure, thereby forming the inner peripheral surfaces 2004 of the plurality of segments 20. It is held in a perfect circle shape, and deformation of the inner peripheral surface 2004 is prevented.

As shown in FIGS. 2, 3, and 4, the roundness measuring device 70 includes a front first to front fourth distance sensor 34 </ b> A to 34 </ b> D, a fifth distance sensor 34 </ b> E, and a first intermediate section. ˜Intermediate fourth distance sensors 36 </ b> A to 36 </ b> D, rear first to rear fourth distance sensors 38 </ b> A to 38 </ b> D, and a computer 40.
The front first to fifth distance sensors 34A to 34E detect first to fifth distances D1 to D5 defined below.
That is, the contact surface 2602 of the upper holding body 26 is applied to the upper end of the inner peripheral surface 2004, and the contact surface 2802 of the lower support body 28 is applied to the lower end of the inner peripheral surface 2004. .
In this case, if a plane perpendicular to the axis O of the shield machine 10 and positioned in front of the upper holding body 26 and the lower holding body 28 in the digging direction of the shield machine 10 is the front plane M1, the front plane M1 And a first straight line L1 that intersects with the upper holding body 26 and the lower holding body 28 when viewed from the direction of the axis O and intersects with two opposing portions of the inner peripheral surface 2004. Two points are defined as a first measurement point P1 and a second measurement point P2.
The second straight line L2 extends on the front plane M1, is orthogonal to the axis O and the first straight line L1, and intersects the upper holding body 26 and the lower holding body 28 when viewed from the direction of the axial center O. Are two measurement points P3 and a fourth measurement point P4. The two points intersect the two opposite locations on the inner peripheral surface 2004.
The third straight line L3 extends on the front plane M1 and intersects the axis O, the first straight line L1, and the second straight line L2, and extends in the vertical direction when viewed from the direction of the axial center O. Two points intersecting the upper holding body 26 and the lower holding body 28 are defined as a fifth measurement point P5 and a sixth measurement point P6.

The front first distance sensor 34A detects the distance between the first measurement point P1 and the upper holding body 26 along the first straight line L1 when viewed from the direction of the axis O as the first distance D1.
The front second distance sensor 34B detects the distance between the second measurement point P2 and the lower holding body 28 along the first straight line L1 when viewed from the direction of the axis O as the second distance D2.
The front third distance sensor 34C detects the distance between the third measurement point P3 and the upper holding body 26 along the second straight line L2 as viewed from the direction of the axis O as the third distance D3.
The front fourth distance sensor 34D detects the distance between the fourth measurement point P4 and the lower holding body 28 along the second straight line L2 as viewed from the direction of the axis O as the fourth distance D4.
The fifth distance sensor 34E detects the distance between the upper holding body 26 and the lower holding body 28 along the third straight line L3 as viewed from the direction of the axis O as the fifth distance D5.
In the present embodiment, the fifth distance sensor 34E is attached to the upper holding body 26, and the fifth distance sensor 34E sets the distance from the measurement plate 62 attached to the lower holding body 28 to the fifth distance sensor 34E. Detect as distance D5. Alternatively, the fifth sensor 34E may be attached to the lower holding body 28, and the measurement plate 62 may be attached to the upper holding body 26.

In the present embodiment, the front first, front third, and fifth distance sensors 34A, 34C, and 34E are attached to the upper holding body 26 via a mounting frame (not shown), and the front second, The front fourth distance sensors 34B and 34D are attached to the lower holding body 28 via a mounting frame (not shown).
The upper holding body 26 and the lower holding body 28 are at the upper end of the inner peripheral surface 2004 in a state where the inner peripheral surface 2004 of the segment 20 extends on the circumference of a predetermined radius around the axis O. The front first to front fourth distance sensors 34 </ b> A to 34 </ b> D and the fifth distance sensor 34 </ b> E are applied to the lower ends of the same radius around the axis O of the shield machine 10. Is placed on top.

The intermediate part first to intermediate part fourth distance sensors 36A to 36D and the rear part first to rear part fourth distance sensors 38A to 38D are different from the above-described front part plane M1 except that the arranged plane is different from the above-described front part plane M1. Since it is the same as the front part 1st-front part 4th distance sensor 34A-34D, it overlaps and it demonstrates easily.
The middle part first to middle part fourth distance sensors 36 </ b> A to 36 </ b> D are arranged on a middle part plane M <b> 2 located immediately after the upper holding body 26 and the lower holding body 28 in the digging direction of the shield machine 10.
The first to fourth distances D1 to D4 detected by the middle part first to middle part fourth distance sensors 36A to 36D differ in the position of the inner peripheral surface 2004 to be measured in the direction of digging of the shield machine 10. Except for this point, it is the same as the first to fourth distances D1 to D4 detected by the first to fourth distance sensors 34A to 34D.

Further, the rear first to rear fourth distance sensors are arranged on a rear plane M3 positioned rearward of the intermediate plane M2 in the digging direction of the shield machine 10.
The first to fourth distances D1 to D4 detected by the rear first to rear fourth distance sensors 38A to 38D differ in the position of the inner peripheral surface 2004 to be measured in the shield machine 10 in the digging direction. Except for the point, it is the same as the first to fourth distances D1 to D4 detected by the first to fourth distance sensors 34A to 34D.

In the present embodiment, the intermediate portion first and intermediate portion third distance sensors 36A, 36C are attached to the upper holding body 26 via a mounting frame (not shown), and the intermediate portion second, intermediate portion fourth The distance sensors 36B and 36D are attached to the lower holding body 28 via an attachment frame (not shown).
Similarly, the rear first and rear third distance sensors 38A and 38C are attached to the upper holding body 26 via a mounting frame (not shown), and the rear second and rear fourth distance sensors 38B and 38D are It is attached to the lower holding body 28 via a mounting frame (not shown).

  In addition, when the inner peripheral surface 2004 of the segment 20 extends on the circumference of the specified radius when viewed from the direction of the axis O of the shield machine 10, the upper holding body 26 and the lower holding body 28 are the inner peripheral surface. The intermediate portion first to intermediate portion fourth distance sensors 36A to 36D and the rear portion first to rear portion fourth distance sensors 38A to 38D are arranged in the state of being applied to the upper end and the lower end of 2004. They are arranged on the circumference of the same radius centered on O.

  In addition, front part 1st-front part 4th distance sensor 34A-34D, 5th distance sensor 34E, middle part 1st-middle part 4th distance sensor 36A-36D, rear part 1st-rear part 4th distance The sensors 38A to 38D include a light emitting unit that irradiates the measurement target with laser light and a light receiving unit that receives the reflected light reflected from the measurement target, and changes in the incident position of the reflected light incident on the light receiving unit. Various conventionally known sensors such as a sensor for detecting a distance based on the above can be used.

As shown in FIG. 1, the computer 34 is provided on the carriage 16 </ b> A of the rear carriage 16, and includes a front first to fourth distance sensors 34 </ b> A to 34 </ b> D, a fifth distance sensor 34 </ b> E, an intermediate first to first intermediate parts. 4 distance sensors 36A-36D and rear first to rear fourth distance sensors 38A-38D via cables (not shown), and based on distance data supplied from each distance sensor via the cables. The roundness of the peripheral surface 2004 is calculated.
As shown in FIG. 4, the computer 34 includes a CPU 36, a ROM 38, a RAM 40, a hard disk device 42, a disk device 44, a keyboard 46, a mouse 48, a display 50, and a printer connected via an interface circuit (not shown) and a bus line. 52, an interface 54, and the like.
The ROM 38 stores a control program and the like, and the RAM 40 provides a working area.
The hard disk device 42 stores a calculation program for calculating the roundness.
The disk device 44 records and / or reproduces data on a recording medium such as a CD or a DVD.
The keyboard 46 and the mouse 48 receive an operation input by the operator.
The display 50 displays and outputs data, and the printer 52 prints and outputs data. The display 50 and the printer 52 output data.
The interface 54 is used to exchange data with an external device. In the present embodiment, the interface 54 is used to input image data supplied from the plurality of camera units 32.
The CPU 36 executes a calculation program stored in the hard disk device 42 to execute a calculation process for calculating the roundness of the inner peripheral surface 2004 based on the distance data input from the interface 54. Is output via the display 50, the printer 52, or the interface 54.
In the present embodiment, the computer 34 constitutes the roundness calculation means in the claims.

A calculation process for calculating the roundness α of the inner peripheral surface 2004 will be described in detail.
The roundness α can be calculated based on the four distances of the first to fourth distances x1 to x4 detected by the front first to front fourth distance sensors 34A to 34D.
Further, the roundness α can be calculated more accurately by adding the fifth distance x5 detected by the fifth distance sensor 34E to the four distances of the first to fourth distances x1 to x4.
That is, when calculating the roundness α based on the four distances of the first to fourth distances x1 to x4 or the five distances of the first to fifth distances x1 to x5, the following formula ( The roundness α is calculated based on 1). In Equation (1), the roundness α is represented by the standard deviation of the distance detected by each distance sensor.

However, n is the number of distance sensors, i is a natural number of 1 or more, and xi indicates the distances x1, x2, x3,... Detected by each distance sensor. The x bar is the average value of the distances x1 to xi.
In addition, calculation of said roundness (alpha) is not limited to Formula (1), Various conventionally well-known calculation methods are employable.
Further, as apparent from the equation (1), the number of distance sensors is not limited to four or five.

The roundness α in the intermediate plane M2 is calculated based on the four distances of the first to fourth distances x1 to x4 detected by the first to fourth intermediate distance sensors 36A to 36D. It can be calculated from equation (1), or can be calculated from equation (1) based on the fifth distance x5 in addition to these four distances.
Further, the roundness α in the rear plane M3 is calculated based on the four distances of the first to fourth distances x1 to x4 detected by the rear first to rear fourth distance sensors 38A to 38D ( It can be calculated from 1) or can be calculated from equation (1) based on the fifth distance x5 in addition to these four distances.
Therefore, in the present embodiment, it is possible to calculate the roundness α at three locations of the front plane M1, the middle plane M2, and the rear plane M3.

Next, the effect of the roundness measuring device 70 will be described.
First, each distance sensor and the computer 34 of the roundness measuring device 70 are activated, and the distance data detected by each distance sensor is set to be supplied to the computer 34.
Next, the shield machine 10 starts excavation of the natural ground and the assembly of the segment tunnel.
It is assumed that the upper holder 26 is applied to the upper end of the inner peripheral surface 2004 by the perfect circle holding device 22 and the lower holder 28 is applied to the lower end of the inner peripheral surface 2004.
The computer 34 calculates the roundness α at three locations of the front plane M1, the middle plane M2, and the rear plane M3 based on the distance data supplied from each distance sensor.
Accordingly, the three roundness values α are output via the display 50 and the printer 52.
The output roundness α is used as data for controlling the excavation direction of the shield machine 10 or is used as data for controlling the assembly of the segment 20.

As described above, according to the present embodiment, the upper holding body 26 is applied to the upper end of the inner peripheral surface 2004 and the lower holding body 28 is applied to the lower end of the inner peripheral surface 2004. , The distance between the inner peripheral surface 2004 of the segment 20 detected by the first to fourth distance sensors 34A to 34D (36A to 36D, 38A to 38D) and the upper holding body 26 and the lower holding body 28, the fifth distance The roundness α of the inner peripheral surface 2004 is calculated using the distance between the upper holding body 26 and the lower holding body 28 detected by the sensor 34E.
Therefore, since the roundness α during excavation can be obtained continuously without stopping the excavation operation of the shield machine 10, it is advantageous in improving the measurement efficiency of the roundness α.
Further, since the measurement work by the worker is unnecessary, it is advantageous in reducing the physical burden on the worker.
Only the distances D1 to D4 between the inner peripheral surface 2004 of the segment 20 and the upper holding body 26 and the lower holding body 28 detected by the first to fourth distance sensors 34A to 34D (36A to 36D, 38A to 38D). May be used to calculate the roundness α of the inner circumferential surface 2004. However, when the roundness α of the inner peripheral surface 2004 is calculated using the distance D5 between the upper holding body 26 and the lower holding body 28 detected by the fifth distance sensor 34E as in the present embodiment, This is advantageous for improving the measurement accuracy of the circularity α.

Further, since the first to fifth distance sensors are attached to the upper holding body 26 or the lower holding body 28, it is advantageous in simplifying the configuration and reducing the cost.
Although the first to fifth distance sensors may be attached to the shield machine 10 using a dedicated member, the present embodiment is more advantageous in simplifying the configuration and reducing the cost. Become.

In the present embodiment, since the distance sensor is provided at each of the three positions of the front plane M1, the middle plane M2, and the rear plane M3, the three positions of the front plane M1, the middle plane M2, and the rear plane M3 are provided. It is possible to calculate the roundness α in each of the above.
The location where the distance sensor is provided may be on a single plane. However, according to the present embodiment, the change in roundness α depending on the location accompanying the progress of the excavation operation by the shield machine 10 can be obtained in detail. Therefore, when the roundness α is used as data for controlling the direction of excavation of the shield machine 10 or used as data for controlling the assembly of the segment 20, it is advantageous in performing the control with high accuracy.

  DESCRIPTION OF SYMBOLS 10 ... Shield machine, 18 ... Tunnel, 20 ... Segment, 2004 ... Inner peripheral surface, 22 ... Perfect circle holding device, 26 ... Upper side holding body, 28 ... Lower side holding body, 34A-34D ... ... front first to front fourth distance sensors, 34E ... fifth distance sensor, 36A to 36D ... middle first to middle fourth distance sensors, 38A to 38D ... rear first to first Rear fourth distance sensor, 40... Computer (roundness calculation means), 70... Roundness measuring device, O... Axis of shield machine, M1. , M3... Rear plane, L1 to L3... First to third straight lines, P1 to P4... First to fourth measurement points, D1 to D5. Roundness.

Claims (5)

An upper holding body is applied to the upper end of the inner peripheral surface of the segment assembled into a cylindrical wall shape, and the inner peripheral surface is held in a perfect circle shape by applying a lower holding body to the lower end of the inner peripheral surface of the segment. A roundness measuring device that is provided in a shield machine including a roundness holding device and measures the roundness of the inner peripheral surface of the segment assembled into the cylindrical wall shape,
In a state where the upper holding body is applied to the upper end of the inner peripheral surface and the lower holding body is applied to the lower end of the inner peripheral surface, the surface is perpendicular to the axis of the shield machine. A first straight line L1 that extends and is orthogonal to the shaft center and intersects the upper holding body and the lower holding body when viewed from the axial direction intersects two opposing locations on the inner peripheral surface 2 One point is defined as a first measurement point P1 and a second measurement point P2, and extends on the plane and is orthogonal to the axis and the first straight line L1 and is held on the upper side when viewed from the axis direction. When two points where the second straight line L2 intersecting the body and the lower holding body intersects the two opposite locations of the inner peripheral surface are the third measurement point P3 and the fourth measurement point P4,
A first distance sensor attached to the upper holding body and detecting a distance from the first measurement point P1 along the first straight line L1 as viewed from the axial direction as a first distance D1; ,
A second distance sensor attached to the lower holding body and detecting a distance from the second measurement point P2 along the first straight line L1 when viewed from the axial direction as a second distance D2. When,
A third distance sensor attached to the upper holding body and detecting a distance from the third measurement point P3 along the second straight line L2 as viewed from the axial direction as a third distance D3; ,
A fourth distance sensor that is attached to the lower holding body and detects a distance from the fourth measurement point P4 along the second straight line L2 as viewed from the axial direction as a fourth distance D4. When,
Roundness calculation means for calculating the roundness of the inner peripheral surface based on the first to fourth distances D1 to D4 ;
In the first distance sensor, the second distance sensor, the third distance sensor, and the fourth distance sensor, the inner peripheral surface of the segment is a circle having a predetermined radius centered on the axis. In a state where the circumference extends and the upper holding body and the lower holding body are applied to the upper end and the lower end of the inner peripheral surface of the segment, Arranged on the circumference of the same radius with dimensions smaller than the defined radius,
Roundness measuring device characterized by that. Attached to the upper holding body or the lower holding body, extends on the plane and intersects the axial center, the first straight line L1, the second straight line L2, and in the vertical direction when viewed from the axial direction. A fifth distance sensor for detecting a distance between the upper holding body and the lower holding body along the extending third straight line L3 as a fifth distance D5;
The roundness calculation means calculates the roundness of the inner peripheral surface based on the first to fifth distances D1 to D5.
The roundness measuring device according to claim 1. The plane is
A front plane located in front of the upper holding body and the lower holding body in the digging direction of the shield machine;
An intermediate plane located immediately after the upper holding body and the lower holding body in the digging direction of the shield machine;
A rear plane located behind the intermediate plane in the digging direction of the shield machine,
The first distance sensor to the fourth distance sensor are:
A front first distance sensor to a front fourth distance sensor provided corresponding to the front plane;
An intermediate portion first distance sensor to an intermediate portion fourth distance sensor provided corresponding to the intermediate portion plane;
A rear first distance sensor to a rear fourth distance sensor provided corresponding to the rear plane;
The roundness calculation means calculates the roundness corresponding to each of the front plane, the intermediate plane, and the rear plane.
The roundness measuring device according to claim 1 or 2, wherein An upper holding body is applied to the upper end of the inner peripheral surface of the segment assembled into a cylindrical wall shape, and the inner peripheral surface is held in a perfect circle shape by applying a lower holding body to the lower end of the inner peripheral surface of the segment. In a shield machine including a perfect circle holding device, a roundness measurement method for measuring the roundness of the inner peripheral surface of the segment assembled into the cylindrical wall shape,
In a state where the upper holding body is applied to the upper end of the inner peripheral surface and the lower holding body is applied to the lower end of the inner peripheral surface, the surface is perpendicular to the axis of the shield machine. A first straight line L1 that extends and is orthogonal to the shaft center and intersects the upper holding body and the lower holding body when viewed from the axial direction intersects two opposing locations on the inner peripheral surface 2 One point is defined as a first measurement point P1 and a second measurement point P2, and extends on the plane and is orthogonal to the axis and the first straight line L1 and is held on the upper side when viewed from the axis direction. When two points where the second straight line L2 intersecting the body and the lower holding body intersects the two opposite locations of the inner peripheral surface are the third measurement point P3 and the fourth measurement point P4,
Detecting a distance between the first measurement point P1 along the first straight line L1 and the first reference point set on the upper holding body as viewed from the axial direction as a first distance D1,
A distance between the second measurement point P2 along the first straight line L1 and the second reference point set on the lower holding body as viewed from the axial direction is detected as a second distance D2. ,
Detecting a distance between the third measurement point P3 along the second straight line L2 and the third reference point set on the upper holding body as viewed from the axial direction as a third distance D3;
A distance between the fourth measurement point P4 along the second straight line L2 and the fourth reference point set on the lower holding body as viewed from the axial direction is detected as a fourth distance D4. ,
Calculating the roundness of the inner peripheral surface based on the first to fourth distances D1 to D4 ;
The first reference point, the second reference point, the third reference point, and the fourth reference point are circles having a predetermined radius with the inner peripheral surface of the segment centered on the axis. In a state where the circumference extends and the upper holding body and the lower holding body are applied to the upper end and the lower end of the inner peripheral surface of the segment, It is set to be located on the circumference of the same radius with dimensions smaller than the defined radius,
Roundness measurement method characterized by this. The upper holding body along the third straight line L3 extending on the plane and intersecting the axial center, the first straight line L1, and the second straight line L2 and extending in the vertical direction when viewed from the axial direction. And a distance between the lower holding body and a fifth distance D5,
Calculating the roundness of the inner peripheral surface based on the first to fifth distances D1 to D5;
The roundness measurement method according to claim 4, wherein:

Images