Measuring device and method for measuring tail clearance and roundness of segment rings

Abstract

To enable measurement of tail clearance and roundness using a single measuring device with a small number of measurements.SOLUTION: A measuring device 24 comprises a plurality of scanning devices 28 arranged at different positions from each other in a circumferential direction and a computing device 29. Each scanning device 28 is positioned in front of a front end face 26 of a segment ring 16 in a front-most row assembled inside a skin plate 8 and radially inward from an inner surface 25 of the segment ring 16, and scans at least the front end face of the segment ring 16 and an inner surface 21 of the skin plate 8. The computing device 29 acquires point group data scanned by the plurality of scanning devices and calculates tail clearance and roundness on the basis of the acquired point group data. The measuring device can measure them with a single measurement.SELECTED DRAWING: Figure 3

Claims

1. A measuring device for measuring the roundness of a segment ring assembled inside the skin plate of a shield machine, A plurality of scanning devices are arranged at mutually distinct positions in the circumferential direction, forward of the front end surface of the frontmost segment ring and radially inward of the inner surface of the segment ring, and scan at least the front end surface and the inner surface of the segment ring. The system includes a calculation device that acquires point cloud data scanned by a plurality of scanning devices and calculates the roundness based on the acquired point cloud data, The aforementioned computing device, for each of the plurality of scanning devices, From the point cloud data of the front end surface of the segment ring, linear fitting is performed using data within a predetermined segment front end surface measurement area, and the segment front end surface line segment is calculated. From the point cloud data of the inner surface of the segment ring scanned by the scanning device, linear fitting is performed using data within a predetermined segment inner surface measurement area, and the segment inner surface line segment is calculated. The intersection of the extension line of the inner surface line segment of the segment and the extension line of the front end surface line segment of the segment is calculated as the inner surface edge coordinate of the segment closest to the inner surface of the segment ring on the front end surface of the segment ring. A measuring device configured to calculate the roundness based on the inner edge coordinates of the segments of a plurality of scanning devices.

2. A measuring device for measuring the tail clearance, which is the distance between the inner surface of the skin plate of a shield machine and the outer surface of the segment ring, A plurality of scanning devices are arranged at mutually distinct positions in the circumferential direction, forward of the front end face of the foremost row of segment rings assembled inside the skin plate and radially inward of the inner surface of the segment rings, and scanning at least the front end face of the segment rings and the inner surface of the skin plate. The system includes a calculation device that acquires point cloud data scanned by a plurality of the scanning devices and calculates the tail clearance based on the acquired point cloud data, The aforementioned computing device, for each of the plurality of scanning devices, The coordinates on the front end surface of the segment ring that are closest to the outer surface of the segment ring are calculated as the segment outer surface edge coordinates. From the point cloud data of the front end surface of the segment ring, linear fitting is performed using data within a predetermined segment front end surface measurement area, and the segment front end surface line segment is calculated. From the point cloud data of the inner surface of the skin plate, linear fitting is performed using data within a predetermined skin plate measurement area, and the inner surface line segment of the skin plate is calculated. The coordinates at which the extension line of the front end surface line segment of the aforementioned segment intersects with the inner surface line segment of the aforementioned skin plate are calculated as the intersection coordinates. A measuring device configured to calculate the tail clearance based on the outer edge coordinates of the segment and the intersection coordinates.

3. The measuring device according to claim 1 or 2, wherein the plurality of scanning devices are attached to a ring girder integrally provided at the front end of the skin plate.

4. The measuring apparatus according to claim 3, wherein the plurality of scanning devices include at least four scanning devices arranged above, below, to the right and to the left of the ring girder.

5. The plurality of scanning devices further scan the inner surface of the segment ring, The aforementioned computing device, for each of the plurality of scanning devices, The coordinates on the front end surface of the segment ring that are closest to the outer surface of the segment ring are calculated as the segment outer surface edge coordinates. From the point cloud data of the inner surface of the skin plate, linear fitting is performed using data within a predetermined skin plate measurement area, and the inner surface line segment of the skin plate is calculated. The coordinates at which the extension line of the front end surface line segment of the aforementioned segment intersects with the inner surface line segment of the aforementioned skin plate are calculated as the intersection coordinates. The measuring device according to claim 1, further calculating the tail clearance, which is the distance between the inner surface of the skin plate and the outer surface of the segment ring, based on the outer edge coordinates of the segment and the intersection coordinates.

6. The measuring device according to claim 1, wherein the calculation device calculates the actual vertical inner diameter and the actual horizontal inner diameter of the segment ring from the coordinates of the inner surface edges of a plurality of segments, and calculates the roundness based on both actual inner diameters and the design inner diameter of the segment ring.

7. The measuring device according to claim 5, wherein the calculation device calculates the distance between the outer edge coordinates of the segment and the intersection coordinates as the tail clearance.

8. Each of the plurality of scanning devices scans at least the front end surface of the segment ring and the inner surface of the skin plate during the excavation of the shield machine, The measurement device according to claim 5, wherein the calculation device moves at least the segment front end surface measurement area and the skin plate measurement area to follow the moving segment ring based on the excavation distance of the shield machine, and calculates the segment inner edge coordinates, the segment outer edge coordinates and the intersection coordinates.

9. The segments constituting the aforementioned segment ring are flat segments. The measuring device according to claim 5, wherein the calculation device is located on the extension of the front end surface line of the segment, and calculates the outer surface edge coordinates of the segment by moving radially outward by the thickness of the segment from the inner surface edge coordinates of the segment.

10. The segments constituting the aforementioned segment ring are box-shaped segments. The measuring device according to claim 5, wherein the calculation device extracts the innermost coordinate of the segment ring from the point cloud data of the front end surface of the segment ring scanned by the scanning device as the inner surface edge coordinate of the segment, and extracts the outermost coordinate of the segment ring from the point cloud data of the front end surface of the segment ring as the outer surface edge coordinate of the segment.

11. A measurement method for measuring the roundness of a segment ring assembled inside the skin plate of a shield machine, The steps include scanning at least the front end surface and the inner surface of the segment ring from multiple circumferentially distinct positions, which are forward of the front end surface of the frontmost segment ring and radially inward of the inner surface of the segment ring, using multiple scanning devices, The calculation unit includes the steps of acquiring scanned point cloud data for each position in the circumferential direction and calculating the roundness based on the acquired point cloud data, In the step of calculating the roundness, For each of the multiple scanning devices, From the point cloud data of the front end surface of the segment ring, linear fitting is performed using data within a predetermined segment front end surface measurement area, and the segment front end surface line segment is calculated. From the point cloud data of the inner surface of the segment ring scanned by the scanning device, linear fitting is performed using data within a predetermined segment inner surface measurement area, and the segment inner surface line segment is calculated. The intersection of the extension line of the inner surface line segment of the segment and the extension line of the front end surface line segment of the segment is calculated as the inner surface edge coordinate of the segment closest to the inner surface of the segment ring on the front end surface of the segment ring. A measurement method for calculating the roundness based on the inner edge coordinates of the segments of a plurality of scanning devices.

12. A measurement method for measuring the tail clearance, which is the distance between the inner surface of the skin plate of a shield machine and the outer surface of the segment ring, The steps include scanning at least the front end surface of the segment ring and the inner surface of the skin plate from multiple circumferentially distinct positions, which are forward of the front end surface of the foremost row of segment rings assembled inside the skin plate and radially inward of the inner surface of the segment rings, using multiple scanning devices, The process includes the steps of: using a computing device to acquire scanned point cloud data for each position in the circumferential direction, and calculating the tail clearance based on the acquired point cloud data; In the step of calculating the tail clearance, for each of the plurality of scanning devices, The coordinates on the front end surface of the segment ring that are closest to the outer surface of the segment ring are calculated as the segment outer surface edge coordinates. From the point cloud data of the front end surface of the segment ring, linear fitting is performed using data within a predetermined segment front end surface measurement area, and the segment front end surface line segment is calculated. From the point cloud data of the inner surface of the skin plate, linear fitting is performed using data within a predetermined skin plate measurement area, and the inner surface line segment of the skin plate is calculated. The coordinates at which the extension line of the front end surface line segment of the aforementioned segment intersects with the inner surface line segment of the aforementioned skin plate are calculated as the intersection coordinates. A measurement method for calculating the tail clearance based on the outer edge coordinates of the segment and the intersection coordinates.

Images