A method, system and storage medium for attitude measurement of large-diameter shield segments

Abstract

The present invention discloses a method, system and storage medium for measuring the attitude of large-diameter shield segments, belonging to the technical field of shield tunnels. The method includes: S1: The measuring point acquisition stage; S2: The reference plane calculation stage, calculating the average mileage of n measuring points, and taking the cross-section where the average mileage is located as the reference plane; and calculating the designed center coordinates according to the average mileage and the height difference from the center to the rail surface before performing the shield segment attitude measurement stage; S3: The measuring point projection stage, projecting the n measuring points onto the reference plane according to the horizontal curve and vertical curve, obtaining a plurality of projection points corresponding to the measuring points and calculating the offsets and elevations of the projection points; S4: The center coordinate calculation stage, calculating the weighted calculated center coordinates according to the offsets, elevations of the projection points and the designed radius R of the shield segment; S5: The shield segment attitude measurement stage, obtaining the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates to obtain the shield segment attitude. By using the present invention, the shield segment attitude can be directly measured through the measuring points.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling, and particularly to a method, a system and a storage medium for measuring the attitude of large-diameter shield segments. Background Art

[0002] When constructing a tunnel by the shield method, the diameter is about 8 m. With the application of the shield method in high-speed railway, highway, water diversion and other projects, the shield diameter increases to about 15 m. The lining adopts a precast segment lining ring. In order to timely check the accuracy of the segment installation position and the change situation after grouting, the segment attitude is measured after the segment is installed and before it exits the shield tail. The mature method is the segment ruler method. For the segment ruler measurement method, the length of the ruler determines the accuracy of the segment attitude. When the segment diameter is small, it can be used. After the segment diameter becomes larger, the length of the segment ruler also needs to increase accordingly to meet the measurement and calculation accuracy of the segment attitude. After the segment ruler grows, it is easy to deform, and the handling and operation difficulties increase. Since the segment has not exited the shield tail and the rear support facilities, the visibility condition is poor, and the effect of the center fitting method is poor. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method, a system and a storage medium for measuring the attitude of large-diameter shield segments.

[0004] The purpose of the present invention is achieved by the following technical solutions: In the first aspect of the present invention, there is provided a method for measuring the attitude of large-diameter shield segments, including the following steps:

[0005] S1: In the measuring point acquisition stage, n measuring points in the same cross-section are collected on site, where n is greater than or equal to 2; and the mileage, offset and track surface height of each measuring point are calculated.

[0006] S2: In the reference plane calculation stage, the average mileage of the n measuring points is calculated, and the cross-section where the average mileage is located is used as the reference plane; and before the segment attitude measurement stage, the designed center coordinates are obtained according to the average mileage and the height difference from the center to the track surface.

[0007] S3: In the measuring point projection stage, the n measuring points are projected onto the reference plane according to the horizontal curve and the vertical curve, and a plurality of projection points corresponding to the measuring points are obtained and the offset and elevation of the projection points are calculated.

[0008] S4: In the calculation stage of calculating the center coordinates, the weighted calculated center coordinates are obtained according to the offset, elevation of the projection points and the segment design radius R.

[0009] S5: In the segment attitude measurement stage, the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates are obtained to obtain the segment attitude.

[0010] Preferably, in the S4: calculation stage of calculating the center coordinates, the following steps are further included:

[0011] S41: Calculate the azimuth angle from the designed center of the circle to the projection point, where , x 0 is the elevation of the designed center of the circle, y 0 is the offset of the designed center of the circle, is the elevation of the i-th projection point , is the offset of the i-th projection point ;

[0012] S42: Sort the azimuth angles from small to large. After sorting, it is . Sort the projection points according to the sorting result of the azimuth angles. After sorting, it is , where is the azimuth angle from the designed center of the circle to the 1st projection point, is the azimuth angle from the designed center of the circle to the i-th projection point, is the azimuth angle from the designed center of the circle to the n-th projection point, is the 1st projection point sorted according to the sorting result of the azimuth angles, is the i-th projection point sorted according to the sorting result of the azimuth angles, is the n-th projection point sorted according to the sorting result of the azimuth angles;

[0013] S43: Combine any two points in the sorted projection points and calculate the distance and direction from any two points to : Obtain the distance from to , and the direction ;

[0014] S44: Data elimination. When is less than the preset minimum chord length or greater than the preset maximum chord length, it does not participate in the calculation;

[0015] S45: Calculate the center point coordinates from to :

[0016] ;

[0017] S46: Calculate the azimuth angle and distance from M j to the calculated center of the circle O j :

[0018] Azimuth angle: , Distance: ;

[0019] S47: Calculate M j to O j coordinate increment: , obtain M j to O j coordinate increment in the elevation direction and coordinate increment in the offset direction ;

[0020] S48: Calculate coordinates: ;

[0021] S49: Determine weights. O j The corresponding chord length is , sum up all the chord lengths involved in the calculation , weights ;

[0022] S410: Calculate the weighted average of the center coordinates obtain the weighted calculated center coordinates:

[0023] .

[0024] Preferably, design the elevation of the center O 0 as x 0 = H + h , where H is the rail surface height of the reference plane calculated according to the average mileage and vertical curve, h is the height difference from the rail surface to the center of the segment, which is a fixed value; design the offset of the center O 0 as y 0 = D, where D is the distance from the tunnel center line to the designed horizontal curve, which is a fixed value, and the offset of the designed horizontal curve is 0.

[0025] The second aspect of the present invention provides: A large-diameter shield segment attitude measurement system for implementing any of the above large-diameter shield segment attitude measurement methods, including:

[0026] A measuring point acquisition module for on-site acquisition of n measuring points in the same cross-section, where n is greater than or equal to 2; and calculate the mileage, offset, and rail surface height of each measuring point;

[0027] A reference plane calculation module for calculating the average mileage of n measuring points, taking the section where the average mileage is located as the reference plane; and calculating the designed center coordinates according to the average mileage and the height difference from the center to the rail surface before measuring the segment attitude.

[0028] A measuring point projection module for projecting the n measuring points onto the reference plane according to the horizontal curve and vertical curve, obtaining multiple projection points corresponding to the measuring points and calculating the offsets and elevations of the projection points.

[0029] A calculated center coordinate calculation module for calculating the weighted calculated center coordinates according to the offsets, elevations of the projection points and the segment design radius R.

[0030] A segment attitude measurement module for obtaining the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates to obtain the segment attitude.

[0031] The third aspect of the present invention provides: a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are loaded and executed by a processor, any of the above-mentioned large-diameter shield segment attitude measurement methods is implemented.

[0032] The beneficial effects of the present invention are:

[0033] 1) In a large-diameter (above 14m) shield tunnel, if the segment ruler method is selected to measure the segment attitude, the length of the segment ruler needs to reach 6m or more. Such a long segment ruler is prone to deformation, affecting the measurement accuracy. And it cannot be used in the limited space of the shield machine. By using this measurement method, without using a segment ruler, the segment attitude can be directly measured through the measuring points. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of the large-diameter shield segment attitude measurement method;

[0035] Figure 2 It is a schematic diagram of calculating the center;

[0036] Figure 3 It is a schematic diagram of calculating the designed center. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Refer to Figures 1 - 3 , the first aspect of the present invention provides: a large-diameter shield segment attitude measurement method, including the following steps:

[0039] S1: Measuring point acquisition stage, n measuring points on the same section are collected on-site, where n is greater than or equal to 2; and the mileage, offset, and rail surface height of each measuring point are calculated.

[0040] S2: Datum plane calculation stage, calculate the average mileage of n measuring points, and use the section where the average mileage is located as the datum plane; and calculate the designed center coordinates according to the average mileage and the height difference from the center to the rail surface before performing the segment attitude measurement stage.

[0041] S3: Measuring point projection stage, project n measuring points onto the datum plane according to the horizontal curve and vertical curve, obtain multiple projection points corresponding to the measuring points, and calculate the offset and elevation of the projection points.

[0042] S4: Calculation of center coordinates calculation stage, calculate the weighted calculated center coordinates according to the offset, elevation of the projection points, and the segment design radius R.

[0043] S5: Segment attitude measurement stage, obtain the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates to get the segment attitude.

[0044] In this embodiment, the segment attitude can be measured by two or more measuring points and the design radius. The measuring points in S1 are on the inner wall of the segment, the point spacing is as large as possible, and they are roughly at the same mileage and the same ring segment, and the mileage, offset, and rail surface height of the measuring points are calculated. As Figure 2 shown, establish a rectangular coordinate system, the x direction is the tunnel elevation direction, and the y direction is the tunnel offset direction. Define the polar coordinate and coordinate increment calculation methods: the coordinates of point A are (a, b), the coordinates of point B are (c, d), the distance and azimuth from A to B are respectively S A→B and L A→B . Polar coordinate calculation method: Pol(c - a, d - b), and the calculation result is S A→B and L A→B ; Coordinate increment calculation method: Rec( S A→B , L A→B ), and the calculation result is the coordinate increment from point A(a, b) to point B(c, d), that is, △ x A→B = c - a and △ y A→B = d - b.

[0045] In some embodiments, the S4: Calculation of center coordinates calculation stage further includes the following steps:

[0046] S41: Obtain the designed center Azimuth to the projection point , where x 0 is the elevation of the designed center of the circle, y 0 is the offset of the designed center of the circle, is the elevation of the i-th projection point ; is the offset of the i-th projection point ;

[0047] S42: Sort the azimuths from small to large. After sorting, it is . Sort the projection points according to the sorting result of the azimuths. After sorting, it is , where is the azimuth from the designed center of the circle to the 1st projection point, is the azimuth from the designed center of the circle to the i-th projection point, is the azimuth from the designed center of the circle to the n-th projection point, is the 1st projection point after sorting the projection points according to the sorting result of the azimuths, is the i-th projection point after sorting the projection points according to the sorting result of the azimuths, is the n-th projection point after sorting the projection points according to the sorting result of the azimuths;

[0048] S43: Combine any two points in the sorted projection points and calculate the distance and direction between any two points to : Obtain the distance from , direction ; ;

[0049] S44: Data rejection. When is less than the preset minimum chord length or greater than the preset maximum chord length, it does not participate in the calculation;

[0050] S45: Calculate the center point coordinates from to :

[0051] ;

[0052] S46: Calculate the azimuth and distance from M j to the calculated center of the circle O j :

[0053] Azimuth: , Distance: ;

[0054] S47: Calculate M j to O j coordinate increments: to obtain M j to O j coordinate increments in the elevation direction and coordinate increments in the offset direction ;

[0055] S48: Calculate coordinates of: ;

[0056] S49: Assign weights. The chord length corresponding to O j is Sum up all the chord lengths involved in the calculation , weights ;

[0057] S410: Find the weighted average of the calculated center coordinates to obtain the weighted calculated center coordinates:

[0058] .

[0059] In this embodiment, the preset minimum chord length is 40% of the design diameter, and the preset maximum chord length is 80% of the design diameter. The minimum chord length and the maximum chord length can be adjusted according to the actual construction environment and are not limited to the preferred values given in the present invention.

[0060] In some embodiments, the elevation of the design center O 0 is x 0 = H + h where H is the rail surface height of the reference plane calculated based on the average mileage and the vertical curve, and h is a fixed value for the height difference from the rail surface to the center of the segment; the offset of the design center O 0 is y 0 = D, where D is the distance from the tunnel center line to the designed horizontal curve and is a fixed value, and the offset of the designed horizontal curve is 0.

[0061] In this embodiment, as shown in Figure 2 , for a shield tunnel, the height difference from the rail surface to the center of the segment is a fixed value; for a shield tunnel, the distance from the tunnel (segment) center line to the designed horizontal curve is a fixed value D, the offset of the designed horizontal curve is 0, and the offset of the center O 0 of the tunnel, i.e., the segment y 0 = D.

[0062] The second aspect of the present invention provides: A large-diameter shield segment attitude measurement system for implementing any of the above-mentioned large-diameter shield segment attitude measurement methods, including:

[0063] A measuring point acquisition module for on-site acquisition of n measuring points on the same cross-section, where n is greater than or equal to 2; and calculating the mileage, offset, and rail surface height of each measuring point;

[0064] A reference plane calculation module for calculating the average mileage of n measuring points, taking the cross-section where the average mileage is located as the reference plane; and calculating the designed center coordinates according to the average mileage and the height difference from the center to the rail surface before measuring the segment attitude;

[0065] A measuring point projection module for projecting n measuring points onto the reference plane according to the horizontal curve and vertical curve, obtaining multiple projection points corresponding to the measuring points and calculating the offset and elevation of the projection points;

[0066] A calculated center coordinate calculation module for obtaining the weighted calculated center coordinates according to the offset, elevation of the projection points, and the segment design radius R;

[0067] A segment attitude measurement module for obtaining the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates to obtain the segment attitude.

[0068] The third aspect of the present invention provides: A computer-readable storage medium storing computer-executable instructions, which, when loaded and executed by a processor, implement any of the above-mentioned large-diameter shield segment attitude measurement methods.

[0069] The above is only the preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in related fields. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for measuring the attitude of large-diameter shield segments, characterized in that: It includes the following steps: S1: Measuring point acquisition stage, n measuring points on the same cross-section are collected on-site, where n is greater than or equal to 2; And calculate the mileage, offset and rail surface height of each measuring point; S2: Datum plane calculation stage, calculate the average mileage of n measuring points, and take the cross-section where the average mileage is located as the datum plane; And calculate the designed center coordinates according to the average mileage and the height difference from the center to the rail surface before performing the segment attitude measurement stage; S3: Measuring point projection stage, project n measuring points onto the datum plane according to the horizontal curve and vertical curve, obtain multiple projection points corresponding to the measuring points and calculate the offset and elevation of the projection points; S4: Calculation of center coordinates calculation stage, calculate the weighted calculated center coordinates according to the offset, elevation of the projection points and the segment design radius R; S5: Segment attitude measurement stage, obtain the segment attitude by calculating the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates; The S4: Calculation of center coordinates calculation stage further includes the following steps: S41: Calculate the azimuth angle from the design center of the circle to the projection point , where x 0 is the elevation of the design center of the circle, y 0 is the offset of the design center of the circle, is the elevation of the i-th projection point , is the offset of the i-th projection point . S42: Sort the azimuth angles from smallest to largest. After sorting, it is , sort the projection points according to the sorting result of the azimuth angles. After sorting, it is , where is the azimuth angle from the design center to the 1st projection point, is the azimuth angle from the design center to the i-th projection point, is the azimuth angle from the design center to the n-th projection point, is the 1st projection point after sorting the projection points according to the sorting result of the azimuth angles, is the i-th projection point after sorting the projection points according to the sorting result of the azimuth angles, is the n-th projection point after sorting the projection points according to the sorting result of the azimuth angles; S43: Combine any two points among the sorted projection points and calculate the distance and direction between any two points to : Obtain the distance from to ; S44: Data rejection, when is less than the preset minimum chord length or greater than the preset maximum chord length, it does not participate in the calculation; S45: Calculate to the central point coordinates : ； S46: Calculate M j to calculate the azimuth and distance of the center of the circle O j : Azimuth: , Distance: ; S47: Calculate M j to O j the coordinate increments: , obtaining M j to O j the coordinate increment in the elevation direction and the coordinate increment in the offset direction ; S48: Calculate coordinates of: ; S49: Perform weight determination, O j The corresponding chord length is , sum up all the chord lengths involved in the calculation , weight ; S410: Obtain the weighted average of the calculated center coordinates Obtain the weighted calculated center coordinates: 。 2. The attitude measurement method of large-diameter shield segment according to claim 1, characterized in that: Design center of the circle O Elevation of 0 x 0 = H + h , where H is the rail surface elevation of the reference plane calculated based on the average mileage and vertical curve, h is the fixed difference in height from the rail surface to the center of the segment; the design center of the circle O Offset of 0 y 0 = D, where D is the fixed distance from the tunnel center line to the designed horizontal curve, and the offset of the designed horizontal curve is 0.

3. A large-diameter shield segment attitude measurement system, characterized in that: Used to implement the large-diameter shield segment attitude measurement method as described in claim 1 or 2, including: Measuring point acquisition module, used to collect n measuring points on the same cross-section on-site, where n is greater than or equal to 2; and calculate the mileage, offset and rail surface height of each measuring point; Datum plane calculation module, used to calculate the average mileage of n measuring points, and take the cross-section where the average mileage is located as the datum plane; and calculate the designed center coordinates according to the average mileage and the height difference from the center to the rail surface before measuring the segment attitude; Measuring point projection module, used to project n measuring points onto the datum plane according to the horizontal curve and vertical curve, obtain multiple projection points corresponding to the measuring points and calculate the offset and elevation of the projection points; Calculation of center coordinates calculation module, used to calculate the weighted calculated center coordinates according to the offset, elevation of the projection points and the segment design radius R; Segment attitude measurement module, used to obtain the segment attitude by calculating the elevation difference and offset difference between the weighted calculated center coordinates and the designed center coordinates.

4. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are loaded and executed by a processor, the large-diameter shield segment attitude measurement method as described in claim 1 or 2 is implemented.

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