Method for installing and testing a large-curvature pipe section

Abstract

The application is a method for installing, measuring, controlling and checking large-curvature pipe sections, which comprises checking the posture of the immersed tube during the installation of the immersed tube pipe sections and checking the through measurement accuracy after the installation of the immersed tube pipe sections; the checking the posture of the immersed tube during the installation of the immersed tube pipe sections specifically comprises: GPS-RTK accuracy comparison, total station synchronous monitoring, pulling and closing systems, and diving and pulling measurement; the checking the through measurement accuracy after the installation of the immersed tube pipe sections specifically comprises: combined cavity tooth measurement and point projection measurement. The application can be applied to the installation, measurement, control and checking of large-curvature pipe sections, the accuracy of the measurement and control system is verified through diving, pulling and closing and RTK, the initial posture measurement of the pipe sections is verified through combined cavity measurement and manhole point projection measurement, the accuracy of the measurement and control system and the through measurement is verified from multiple angles, the risk of pipe section docking is reduced, and data basis is provided for subsequent pipe section linear control.

Description

Technical Field

[0001] This invention relates to the technical field of submarine tunnel construction, and in particular to a method for measurement, control and verification of the installation of large curvature pipe sections. Background Technology

[0002] During the installation of high-curvature tunnel sections in the subsea tunnel, the current method uses a dual-measuring tower approach with GPS positioning to control the installation attitude and position of the sections. However, due to factors such as calibration accuracy and GPS positioning accuracy, the final installation attitude of the sections deviates from the values ​​displayed by the measurement and control system. After the section installation is completed, a breakthrough measurement is performed to obtain the final attitude of the section. However, due to the combined effects of factors such as the visibility conditions inside the tunnel, the temperature difference between inside and outside the tunnel, and the decrease in conductor accuracy as the conductor length increases, the breakthrough measurement results may also contain errors. Summary of the Invention

[0003] This invention aims to address the shortcomings of existing technologies by providing a method for measuring and verifying the installation of large-curvature pipe sections. The method verifies and checks the pipe section installation positioning through various means, ensuring the installation accuracy of the pipe sections and verifying the results of the immersed tube installation measurement tower positioning system and the accuracy of the breakthrough measurement. At the same time, it provides a data foundation for subsequent pipe section alignment control.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for measurement and control verification of large curvature pipe section installation includes verifying the attitude of the immersed pipe during the pipe section installation stage and verifying the accuracy of the breakthrough measurement after the pipe section installation is completed.

[0006] S1. The verification of the immersed tunnel's attitude during the tunnel segment installation stage specifically includes:

[0007] S11, GPS-RTK accuracy comparison

[0008] During the preparation stage before the pipe section is laid, the measurement tower control system is checked. The GPS-RTK is set up on the feature point on the top of the pipe to mark the coordinates of the pipe section. The construction coordinate data of the feature point acquired in real time is fed into the system. At the same time, the coordinates of the pipe section marked by the feature point are input into the control system. The control system calculates the real-time construction coordinates of the feature point from the measurement tower data according to the measurement tower calibration parameters. The system compares the data read by RTK with the data calculated by the control system in real time. If the data deviation is within the nominal accuracy of GPS-RTK, it can be verified that the parameters of the measurement tower control system are correct and the positioning of the measurement tower equipment is normal.

[0009] S12, Total Station Synchronous Monitoring

[0010] From the start of the pipe section sinking until the pipe section installation is completed, a total station is used for synchronous monitoring. A total station is set up on the shore to observe the 360° prism point at the top of the measuring tower. The total station monitors the 360° prism to obtain its real-time construction coordinates. The horizontal position should be the same as the GPS position. The elevation is adjusted by adding a fixed correction value. The real-time data from the total station is compared with the GPS positioning data read by the measuring tower control system. This is used as a verification method to evaluate the GPS positioning accuracy before construction.

[0011] S13, Pull-open system

[0012] After the immersed tunnel section is placed on the bed, a gap of 0.8m will be reserved between the tunnel section to be installed and the already installed tunnel section. Then the distance pulling will begin. During the distance pulling process, the hydraulic jack will record the cylinder range in real time. This distance can be used to calculate the tunnel section spacing and verify the mileage deviation display of the measurement tower control system.

[0013] S14, Diving tape measure

[0014] During the pulling process, the axis deviation was monitored by the measurement tower control system, and the mileage deviation was measured by both the pulling system data and the control system data. Simultaneously, divers used measuring rods to measure the distances underwater, verifying both sets of data. As the distance pulling progressed until the GINA nose tip made contact, divers began measuring the misalignment between the pipe sections to verify the axis and elevation deviations displayed by the control system.

[0015] S2. Verification of the accuracy of the breakthrough measurement after the installation of the immersed tunnel sections specifically includes:

[0016] S21, Combined cavity malocclusion measurement

[0017] After the hydraulic pressure connection of the pipe section is completed and the drainage of the joint cavity is finished, the steel sealing doors on both sides of the docking end can be opened to measure the misalignment of the joint cavity. The measurement points of the joint cavity are the same as those of the diving measurement points.

[0018] S22, Point Measurement

[0019] The bottom of the measuring tower corresponds to the manhole. A GPS is installed on the top of the measuring tower and is coaxial with the feature points on the manhole cover. The construction coordinates of the feature points on the cover are measured using GPS-RTK. Subsequently, the feature points on the cover are projected into the pipe using an in-pipe projector. The construction coordinates of the feature points are measured using the through control point. The projection error is compared to verify the accuracy of the pipe section installation densification control network traverse measurement and through measurement. Finally, the attitude of the pipe section tail end is determined.

[0020] The nominal accuracy of GPS-RTK is 1 cm for horizontal plane and 1.5 cm for vertical plane.

[0021] In step S12, the 360° prism at the top of the measuring tower is mounted using a head-shaft bracket, ensuring that the GPS device is coaxial with the prism.

[0022] The correction values ​​in step S12 have been calibrated on land.

[0023] In step S21, the measurement inside the mating cavity avoids the interference of the underwater environment on the measurement of misaligned teeth during diving, and the measurement of GINA compression in the mating cavity is more intuitive. This value shows that the misalignment at the mating end is the final result of the attitude of the tube segment's head end.

[0024] The beneficial effects of this invention are: This invention can be applied to the measurement and control verification of immersed tube installation with large curvature. It verifies the accuracy of the measurement and control system through diving, pulling, and RTK, verifies the initial attitude measurement of the tube section through cavity measurement and manhole projection measurement, and verifies the measurement and control system and the accuracy of the through-connection measurement from multiple angles. This reduces the risk of tube section docking and provides a data basis for subsequent tube section alignment control. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of total station monitoring.

[0026] Figure 2 This is a schematic diagram of the 360° prism at the top of the measuring tower;

[0027] Figure 3 This is a schematic diagram of the underwater measuring points;

[0028] Figure 4 A schematic diagram of the projection point for the manhole.

[0029] The following will describe in detail, with reference to the accompanying drawings, embodiments of the present invention. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of the invention. The invention is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0031] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] A method for measurement and control verification of large curvature pipe section installation includes verifying the attitude of the immersed pipe during the pipe section installation stage and verifying the accuracy of the breakthrough measurement after the pipe section installation is completed.

[0035] The immersed tunnel installation process mainly consists of tunnel segment placement, landing, connection, and hydraulic pressing. Measurement and control positioning during tunnel segment installation is primarily crucial during the placement and landing stages. Subsequent connection and hydraulic pressing make it difficult to adjust the tunnel segment's attitude. Therefore, multi-method verification of the tunnel segment's attitude is particularly important during these stages. Since the subsequent hydraulic pressing process is difficult to control manually, there are no direct verification methods for monitoring the tunnel segment's attitude at this stage.

[0036] S1. The verification of the immersed tunnel's attitude during the tunnel segment installation stage specifically includes:

[0037] S11, GPS-RTK accuracy comparison

[0038] During the preparation stage before the pipe section is laid, the measurement tower control system is checked. The GPS-RTK is set up on the feature point on the top of the pipe where the pipe section coordinates are marked in the first calibration. The construction coordinate data of the feature point acquired in real time is fed into the system. At the same time, the pipe section coordinates marked by the feature point are input into the control system. The control system calculates the real-time construction coordinates of the feature point from the measurement tower data according to the measurement tower calibration parameters. The system compares the data read by RTK with the data calculated by the control system in real time. If the data deviation is within the nominal accuracy of GPS-RTK (1cm for horizontal plane and 1.5cm for vertical plane), it can be verified that the parameters of the measurement tower control system are correct and the positioning of the measurement tower equipment is normal.

[0039] S12, Total Station Synchronous Monitoring

[0040] From the start of tunnel segment descent until completion of installation, a total station is used for synchronous monitoring. A 360° prism point is erected at the top of the total station observation tower on the shore. The 360° prism is mounted using a head-axis bracket, ensuring the GPS equipment is coaxial with the prism. The total station monitors the 360° prism to obtain its real-time construction coordinates. The horizontal position should be the same as the GPS coordinates, with the elevation adjusted by a fixed correction value already calibrated on land. The real-time data from the total station is compared with the GPS positioning data read by the tower's control system. Since the total station's measurement accuracy is higher than GPS, this method can be used as a verification tool to assess the GPS positioning accuracy before construction. The total station monitoring and measurement of the 360° prism at the top of the tower are as follows: Figure 1 , Figure 2 As shown.

[0041] S13, Pull-open system

[0042] After the immersed tunnel section is placed on the bed, a gap of 0.8m will be reserved between the tunnel section to be installed and the already installed tunnel section. Then the distance pulling will begin. During the distance pulling process, the hydraulic jack will record the cylinder range in real time. This distance can be used to calculate the tunnel section spacing and verify the mileage deviation display of the measurement tower control system.

[0043] S14, Diving tape measure

[0044] During the alignment process, the axis deviation is monitored by the measuring tower control system. Mileage deviation is measured using data from both the alignment system and the control system, and simultaneously by divers underwater using measuring rods to measure the distance. These two sets of data are then verified. As the alignment progresses until the GINA nose tip is contacted, divers begin measuring the misalignment between pipe sections to verify the axis and elevation deviations displayed by the control system. The underwater measuring points are as follows: Figure 3 As shown, diving measurement data is the most intuitive, but it has a lag and cannot measure the deviation at the tail end of the immersed tube. Therefore, it cannot be used as a benchmark for controlling the landing attitude of the tube section. However, as a verification method, the deviation between the axis of the docking end and the mileage direction displayed by the diving measurement can be considered as the true value.

[0045] After the immersed tunnel sections are installed and the ballast inside the tunnel is completed, a breakthrough measurement is performed to obtain the initial attitude of the tunnel sections, providing a data basis for subsequent alignment control. However, the accuracy of the traverse measurement may be affected by various factors such as the visibility conditions inside the tunnel, the temperature difference between inside and outside the tunnel, and the total length of the traverse. Therefore, at this stage, other methods are also needed to verify the accuracy of the breakthrough measurement to ensure the authenticity and accuracy of the initial attitude of the immersed tunnel installation.

[0046] S2. Verification of the accuracy of the breakthrough measurement after the installation of the immersed tunnel sections specifically includes:

[0047] S21, Combined cavity malocclusion measurement

[0048] After the hydraulic pressure connection of the pipe section is completed and the draining of the joint cavity is finished, the steel sealing doors on both sides of the docking end can be opened to measure the misalignment of the joint cavity. The measurement points in the joint cavity are the same as those in the underwater measurement. Measuring inside the joint cavity avoids the interference of the underwater environment on the misalignment measurement in the underwater measurement. Moreover, measuring the GINA compression in the joint cavity is more intuitive. This value shows that the misalignment at the docking end is the final result of the attitude of the pipe section head.

[0049] S22, Point Measurement

[0050] The manhole is located at the bottom of the measuring tower at the tail end. A GPS device is installed on the top of the measuring tower and coaxial with the feature points on the manhole cover. The construction coordinates of the feature points on the cover are measured using GPS-RTK. Subsequently, the feature points on the cover are projected into the pipe using an in-pipe projector. The construction coordinates of the feature points are then measured using the through control points. Theoretically, the accuracy of GPS-RTK is 1cm in plane and 1.5cm in elevation. The projection error is compared to verify the accuracy of the pipe section installation densification control network traverse measurement and through measurement. Finally, the attitude of the pipe section tail end is determined. The projection measurement is as follows: Figure 4 As shown.

[0051] After verifying the pipe section installation measurement and positioning results through the above-mentioned verification methods, if there are any deviations, the results of the connection (installation of densified control network traverse measurement) / measurement and control system parameters shall be checked, the problems shall be identified and improved, and if the measurement and control accuracy is verified to be correct, subsequent pipe section alignment control can be carried out according to the actual pipe section posture.

[0052] This invention employs multiple methods to verify the data of the measurement tower control system from multiple angles throughout the entire immersed tunnel installation process. Each method is independent of the others, ensuring the accuracy and authenticity of the immersed tunnel installation measurement and control, and providing a solid data benchmark for the attitude control of the immersed tunnel installation.

[0053] This invention employs a diving measurement and connection system at the docking end of the immersed tube installation to ensure precise docking at the first end and to keep the misalignment of the immersed tube installation within a controllable range, thus greatly reducing the construction risks of hydraulic pressure connection.

[0054] This invention verifies the attitude of the first end of the immersed tube by measuring the cavity after the tube is installed, and verifies the results of the penetration measurement by projecting points, thereby controlling the attitude of the last end and providing a data basis for the control of the tube section alignment.

[0055] This invention can be applied to the measurement and control verification of immersed tunnel sections with large curvature. It verifies the accuracy of the measurement and control system through diving, pulling, and RTK, and verifies the initial attitude measurement of the tunnel section through cavity measurement and manhole projection measurement. It verifies the accuracy of the measurement and control system and the connection measurement from multiple angles, reduces the risk of tunnel section docking, and provides a data basis for subsequent tunnel section alignment control.

[0056] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for measurement, control, and verification of large curvature pipe section installation, characterized in that, This includes verifying the attitude of the immersed tunnel during the tunnel segment installation phase and checking the accuracy of the breakthrough measurement after the tunnel segment installation is completed. S1. The verification of the immersed tunnel's attitude during the tunnel segment installation stage specifically includes: S11, GPS-RTK accuracy comparison During the preparation stage before the pipe section is laid, the measurement tower control system is checked. The GPS-RTK is set up on the feature point on the top of the pipe to mark the coordinates of the pipe section. The construction coordinate data of the feature point acquired in real time is fed into the system. At the same time, the coordinates of the pipe section marked by the feature point are input into the control system. The control system calculates the real-time construction coordinates of the feature point from the measurement tower data according to the measurement tower calibration parameters. The system compares the data read by RTK with the data calculated by the control system in real time. If the data deviation is within the nominal accuracy of GPS-RTK, it can be verified that the parameters of the measurement tower control system are correct and the positioning of the measurement tower equipment is normal. S12, Total Station Synchronous Monitoring From the start of the pipe section sinking until the pipe section installation is completed, a total station is used for synchronous monitoring. A total station is set up on the shore to observe the 360° prism point at the top of the measuring tower. The total station monitors the 360° prism to obtain its real-time construction coordinates. The horizontal position should be the same as the GPS position. The elevation is adjusted by adding a fixed correction value. The real-time data from the total station is compared with the GPS positioning data read by the measuring tower control system. This is used as a verification method to evaluate the GPS positioning accuracy before construction. S13, Pull-open system After the immersed tunnel is placed on the bed, a gap of 0.8m will be reserved between the tunnel section to be installed and the already installed tunnel section. Then the distance pulling will begin. During the distance pulling process, the hydraulic jack will record the hydraulic cylinder range in real time. The recorded hydraulic cylinder range can be used to calculate the tunnel section distance and verify the mileage deviation display of the measurement tower control system. S14, Diving tape measure During the pulling process, the axis deviation is monitored by the measurement tower control system, and the mileage deviation is monitored by the pulling system data and the control system data. At the same time, divers go underwater to use measuring tapes to measure the distance and verify the pulling system data and the control system data. As the distance pulling progresses until the GINA nose tip touches, the divers begin to measure the misalignment between the pipe sections to verify the axis and elevation deviation displayed by the control system. S2. Verification of the accuracy of the breakthrough measurement after the installation of the immersed tunnel sections specifically includes: S21, Combined cavity malocclusion measurement After the hydraulic pressure connection of the pipe section is completed, the steel sealing gates on both sides of the joint end are opened after the drainage of the joint cavity is completed, and the misalignment measurement of the joint cavity can be carried out. The measurement points of the joint cavity are the same as those of the underwater measurement points. The measurement inside the joint cavity avoids the interference of the underwater environment on the misalignment measurement of the underwater section, and the measurement of GINA compression in the joint cavity is more intuitive. The misalignment at the joint end is the attitude of the first end of the pipe section. S22, Point Measurement The bottom of the measuring tower corresponds to the manhole. A GPS is installed on the top of the measuring tower and is coaxial with the feature points on the manhole cover. The construction coordinates of the feature points on the cover are measured using GPS-RTK. Subsequently, the feature points on the cover are projected into the pipe using an in-pipe projector. The construction coordinates of the feature points are measured using the through control point. The projection error is compared to verify the accuracy of the pipe section installation densification control network traverse measurement and through measurement. Finally, the attitude of the pipe section tail end is determined.

2. The method for measurement, control, and verification of large curvature pipe section installation according to claim 1, characterized in that, The nominal accuracy of GPS-RTK is 1 cm for horizontal plane and 1.5 cm for vertical plane.

3. The method for measurement, control, and verification of large curvature pipe section installation according to claim 2, characterized in that, In step S12, the 360° prism at the top of the measuring tower is mounted using a head shaft bracket, so that the GPS device is coaxial with the prism.

4. The method for measurement, control, and verification of large curvature pipe section installation according to claim 3, characterized in that, The correction values ​​in step S12 have been calibrated on land.

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