Method for pre-controlling installation line shape of large-curvature long-pipe section

Abstract

This invention relates to the field of immersed tunnel installation technology, and particularly to a method for pre-controlling the alignment of a long, high-curvature immersed tunnel section. The method includes: S1, calculating the axial deviation Z1 caused by the prefabrication length of the immersed tunnel to be installed; S2, calculating the axial deviation Z2 caused by the prefabrication of the immersed tunnel to be installed; S3, calculating the axial deviation Z3 caused by the lateral inclination angle of the steel shells at both ends of the immersed tunnel; S4, calculating the axial deflection angle γ caused by the installed tunnel section; S5, calculating the axial deflection angle of the installed tunnel section and the resulting axial deviation Z3 at the tail end of the immersed tunnel to be installed; S6, based on the deviation results from steps S1, S2, and S5, performing alignment pre-control on the immersed tunnel to be installed, and calculating its tail end axial deviation Z. E It provides an effective verification method for underwater measurement work that is difficult to control. By using the data of the prefabricated immersed tube and the actual attitude data of the installed immersed tube, the axial deviation and mileage of the subsequent tube sections can be estimated, which reduces the installation risk of the final joint and keeps the alignment deviation of the immersed tube installation within a controllable range.

Description

Technical Field

[0001] This invention relates to the field of immersed tunnel installation technology, and in particular to a method for pre-controlling the alignment of immersed tunnel sections with large curvature. Background Technology

[0002] Since immersed tunnels are installed segment by segment, the existing alignment control method is to ensure that the installation axis of each segment is in the design position. However, hydraulic pressure and GINA compression are difficult to control manually. In addition, the deviation between the prefabricated length of the segment and the mileage of the immersed tunnel, the deviation of the axis after the segment is prefabricated, the deviation of the lateral inclination angle of the steel shell at the end of the segment, and the deviation of the axis of the installed segment can cause the tail end of the segment to deviate from the design position, which in turn affects the installation alignment of the next segment. In particular, the mileage deviation of the curved segment will generate a part of the axis deviation, which will be superimposed on the tail end of the segment.

[0003] When the construction sequence is to fix the final joint position first, the allowable deviation of the axis and mileage of the last pipe section from the design position will have a fixed range. Therefore, in order to ensure the smooth connection of the final joint and minimize the changes in the alignment of subsequent pipe sections, it is necessary to estimate the alignment to the end of the last pipe section before the immersed tube is installed, and then adjust the alignment of each pipe section according to the estimation results. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, this invention provides a method for pre-controlling the installation alignment of long, high-curvature immersed tunnel sections. This method can reduce the construction risks of high-curvature immersed tunnel sections and avoid large misalignments caused by excessive axial deviation of the tunnel section, which would affect subsequent processes such as connection, GINA compression, and hydraulic pressurization.

[0005] This invention provides a method for pre-controlling the installation alignment of a long, high-curvature immersed tunnel section. Assuming the first end of the tunnel section to be installed is perfectly aligned with the last end of an already installed tunnel section, the method calculates the axial deviation of the last end of the tunnel section to be installed, including the following steps: S1. Calculate the axial deviation Z1 caused by the prefabricated length of the immersed tube to be installed: After the prefabrication of the immersed tube to be installed is completed, the length L of the central axis of the immersed tube to be installed is obtained. The angle between the line connecting the centers of the first and last ends of the top plate of the immersed tube to be installed and the perpendicular lines of the first and last end steel shells is denoted as ∠A. Then: 2A = 180L / πR (1) Where R is the radius of curvature of the immersed tube to be installed; L is the length of the central axis of the immersed tube to be installed; According to the Law of Cosines, we can obtain: (Z1+R) 2 =S 2 +R 2 -2SRcos(180°-2A) (2) Where S is the mileage deviation caused by the prefabricated length of the immersed tube to be installed; S2. Calculate the axial deviation Z2 caused by the prefabrication of the immersed tube to be installed: Based on the relative positional relationship of the feature points on the top plate of the immersed tube to be installed, the relative positions of the center points of the first and last ends of the immersed tube to be installed are obtained respectively. Then, the lateral deviation Zs of the center point of the first end of the immersed tube to be installed from its designed position and the lateral deviation Zw of the center point of the last end from its set position are obtained. Then, the axial deviation Z2 generated by the prefabrication of the immersed tube to be installed is: Z2=Zw-Zs (3) S3. Calculate the axial deviation Z3 caused by the lateral inclination angle of the steel shells at both ends of the immersed tube. ’ ; By arranging a ring of feature points on the end steel shells at the beginning and end of the immersed tube, simultaneously fitting the end face, and calculating the angle between the fitted surface and the designed end steel shell, the lateral inclination angle of the end steel shells at the beginning and end of the tube section can be obtained. The lateral inclination angle of the end steel shell at the beginning of the immersed tube to be installed is α, and the inclination angle of the end steel shell at the end of the installed tube section is β. Therefore, the axial deviation angle generated by the end steel shells at the beginning and end of the immersed tube to be installed is α-β, the chord length corresponding to the central axis of the immersed tube to be installed is I, and the axial deviation generated at the end of the immersed tube to be installed is Z3. ’ for: Z3 ’ =Isin(α-β) (4) S4. Calculate the axial deflection angle γ caused by the installed pipe section: Using planar penetration measurement to measure the axial deviation Z at the beginning of the installed pipe section gs The deviation Z of the tail end axis of the installed pipe section gw Then the axial deviation angle γ of the installed pipe section is: γ=arcsin[(Z gw -Z gs ) / I] (5) S5. Calculate the axial deviation angle caused by the installed pipe section and the tail end axial deviation Z3 caused by the pipe section to be installed: Based on the axial deviation angle α-β generated by the end steel shells at both ends of the immersed tube to be installed as described in step S3, and the axial deviation angle γ generated by the installed tube section as described in step S4, the axial deviation angle of the immersed tube to be installed is obtained as α-β+γ. Therefore, the axial deviation Z3 is: Z3=Z gw + Isin(α-β+γ) (6) S6. Based on the deviation results obtained in steps S1, S2, and S5, perform pre-control of the alignment of the immersed tube to be installed and calculate the deviation Z of its tail end axis. E , Z E =Z1+Z2+Z3(7) If Z E If the limit is exceeded, a staggered tooth is installed at the head end of the immersed tube to be installed in order to control the axial deviation of the immersed tube installation. This technical solution provides a method for pre-controlling the installation alignment of long, high-curvature immersed tunnel sections, offering an effective verification method for underwater measurement work that is difficult to control. It mainly uses data from the prefabrication of the immersed tunnel sections and the actual attitude data of the installed sections to predict the axial deviation and mileage of subsequent tunnel sections. At the same time, appropriate control is carried out based on the predicted data during the installation of the sections to be installed, reducing the installation risk of the final joint and keeping the deviation of the immersed tunnel installation alignment within a controllable range.

[0006] In some embodiments of this application, the calculation process for the mileage deviation S caused by the prefabricated length of the immersed tube to be installed in step (1) is as follows: The designed length of the central axis of the immersed tube to be installed is L. 设计 Then the length deviation Z L for: Z L =LL 设计 (8) After the immersed tunnel is installed, the actual mileage of the immersed tunnel installation is measured as L1 through a through-measurement. The mileage deviation S is: S=Z L +L1(9) In some embodiments of this application, in step S1, feature points are set up on the top plate and bottom plate on the first and last end faces of the immersed tube to be installed, and the relative positional relationship of each feature point is measured using a total station to calculate the length L of the central axis of the immersed tube to be installed.

[0007] In some embodiments of this application, in step S3, the axial deviation Z3 is determined based on the lateral tilt angle of the steel shells at both ends of the immersed tube to be installed. ’ By analogy, the axial deviation Z caused by the lateral inclination angle of the steel shells at both ends of the subsequent pipe sections can be obtained. 3n ’ : Z 3n ’ =Z 3(n-1) ’ +I n sin(α n -β n ) In some embodiments of this application, in step S5, the tail end axis deviation Z for subsequent pipe sections is obtained based on the axial deviation angle generated by the installed pipe section and the tail end axis deviation Z3 generated by the pipe section to be installed. 3n Z 3n =Z gw3(n-1) + I nsin(α) n -β n +γ n ) In some embodiments of this application, the tail end axis deviation Z of the subsequent pipe section E for Z En =Z 1n +Z 2n +Z 3n In some embodiments of this application, when 0≤Z E When the diameter is less than 5cm, the first end of the pipe to be installed is completely aligned with the last end of the installed pipe. When the Z... E When the diameter is ≥5cm, the first end of the immersed tube to be installed is fitted with staggered teeth to control the axial deviation within a controllable range.

[0008] In some embodiments of this application, when the Z En When the deviation is ≥5cm, the first n-1 sections of the immersed tube need to be fitted with staggered teeth to control the deviation of the immersed tube axis within a controllable range.

[0009] Based on the above technical solution, the pre-control method for the installation alignment of long pipe sections with large curvature in this embodiment of the invention provides an effective verification means for underwater measurement work that is difficult to control. By pre-controlling the subsequent installation alignment of the pipe section, the axial deviation and mileage of the subsequent pipe section are estimated mainly by using the data of the prefabricated pipe section and the actual attitude data of the installed pipe section. At the same time, appropriate control is carried out according to the estimated data when the pipe section to be installed is installed, which reduces the installation risk of the final joint and can keep the deviation of the installation alignment of the pipe section within a controllable range. This avoids the problems caused by excessive line deviation angle or the large misalignment between the subsequent pipe section and the previous pipe section due to the superposition of line deviation, as well as the GINA compression and hydraulic pressing processes. All data were obtained by total station calibration on land, and its measurement accuracy is higher than that of GPS positioning measurement at sea. Except for the uncontrollable factors of underwater docking construction process that affect the accuracy, its data can be fully used to verify the positioning data of the measurement and control system. Attached Figure Description

[0010] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This refers to the location of the first end feature point of the immersed tube to be installed in this embodiment of the invention; Figure 2 The mileage deviation caused by the prefabrication length of the immersed tube in the embodiment of the present invention; Figure 3This is a schematic diagram showing the angle between the line connecting the steel shells at the beginning and end of the immersed tube and the center point in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the axis deviation caused by the mileage deviation of the immersed tube in an embodiment of the present invention. Figure 5 This is a schematic diagram of the characteristic points for measuring the inclination angle of the end steel shell of the immersed tube according to an embodiment of the present invention; Figure 6 This refers to the lateral tilt angle deviation in this embodiment of the invention. Detailed Implementation

[0011] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0012] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0013] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0014] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0015] Based on experience in installing straight sections of immersed tunnel, it can be seen that the alignment of the tunnel sections during installation of curved sections is affected by factors including the deviation between the prefabricated length of the tunnel section and the mileage of the tunnel installation, the deviation of the prefabricated axis of the tunnel section, the deviation of the lateral inclination angle of the steel shell at the beginning and end of the tunnel section, and the deviation of the axis of the installed tunnel sections.

[0016] An embodiment of the present invention provides a method for pre-controlling the installation alignment of a long, high-curvature immersed tunnel section. Assuming the first end of the immersed tunnel to be installed is perfectly aligned with the last end of an already installed immersed tunnel section, the method calculates the axial deviation of the last end of the immersed tunnel to be installed, comprising the following steps: S1. Calculate the axial deviation Z1 caused by the prefabricated length of the immersed tube to be installed: After the immersed tunnel section is prefabricated in the dry dock, its length will shorten due to tensioning and grouting. Therefore, length measurement is required after prefabrication. In this embodiment, feature points are set at the corners of the top and bottom plates at the beginning and end of the immersed tunnel section. The positions of the feature points at the beginning or end of the immersed tunnel section are as follows: Figure 1 As shown, the top plate and its four corner points are selected as feature points. A total station is used to determine the relative positions of these feature points on land. The shape of the immersed tube is obtained by connecting the corner points, and the arc length L of the central axis of the immersed tube to be installed is calculated. The designed arc length of the central axis of the immersed tube to be installed is L. 设计 The length deviation Z caused by the prefabrication length of the immersed tube L for: Z L =LL 设计 (8) When the actual mileage of the immersed tunnel section to be installed is measured as L1 using the through-measurement method after the installation is completed, the mileage deviation S generated after the prefabrication of the immersed tunnel section to be installed is: S=Z L +L1(9) In addition, the mileage deviation S should also include the estimated value, which is the deviation caused by the deformation of the pipe section to be installed in the water and the compression of GINA, and is derived from previous construction experience during the construction process.

[0017] The prefabrication length of the curved section of the immersed tunnel will not only cause mileage deviations, as shown in the attached... Figure 2 As shown; it will also cause the immersed tube axis to deviate from the set position, resulting in an axis deviation Z1, the specific estimation method of which is as follows: As attached Figure 3 As shown, let ∠A be the angle between the line connecting the centers of the first and last ends of the top plate of the immersed tube to be installed and the perpendicular lines from the steel shells at the first and last ends. Then: 2A = 180L / πR (1) Where R is the radius of curvature of the immersed tube to be installed; L is the length of the central axis of the immersed tube to be installed; As attached Figure 4 As shown, since the mileage deviation S of the prefabricated immersed tube to be installed is the same at the beginning and end, the attached... Figure 4The midline segment QP represents the mileage deviation at the tail end, and its length is also S. Segment OQ represents the radius R of the immersed tube on the design drawing. Segment OP represents the radius R of the precast immersed tube plus the axial deviation Z1 caused by the precast length of the immersed tube. In triangle OPQ, according to the law of cosines, we can obtain: (Z1+R) 2 =S 2 +R 2 -2SRcos(180°-2A) (2) S2. Calculate the axial deviation Z2 caused by the prefabrication of the immersed tube to be installed: Based on the relative positional relationship of the feature points on the top plate of the immersed tube to be installed, the relative positions of the center points of the first and last ends of the immersed tube to be installed are obtained respectively. Then, the lateral deviation Zs between the designed positions of the center points of the first and last ends of the immersed tube to be installed and the lateral deviation Zw between the set positions of the center points of the last and last ends are obtained. Then, the axial deviation Z2 generated after the prefabrication of the immersed tube to be installed is: Z2=Zw-Zs (3) S3. Calculate the axial deviation Z3' caused by the lateral tilt angle of the steel shells at both ends of the immersed tube; Since the GINA compression and hydraulic pressure connection after the immersed tube installation are both based on the assumption that the steel shell at the first end of the immersed tube to be installed is parallel to the steel shell at the last end of the installed tube section, the lateral inclination angle of the steel shell at the last end of the installed tube and the lateral inclination angle at the first end of the immersed tube to be installed will cause the shape of the immersed tube to be installed to change after the hydraulic pressure connection is completed, resulting in the tail end deviating from the design position. Therefore, the shape of the tube section must be estimated based on the lateral inclination angle of the steel shell at the first and last ends of the subsequent tube section before the actual installation of the immersed tube.

[0018] By arranging a ring of characteristic points on the end steel shells at both ends of the immersed tube to be installed, as shown in the attached diagram. Figure 5 As shown, by simultaneously fitting the end face and calculating the angle between the fitted surface and the designed end steel shell, the lateral inclination angles of the steel shells at both ends of the pipe section can be obtained. The lateral inclination angle of the steel shell at the beginning of the pipe section to be installed is α, and the inclination angle of the steel shell at the end of the installed pipe section is β, as shown in the attached figure. Figure 6 As shown; the axial deviation angle generated by the steel shells at both ends of the immersed tube to be installed is α-β, the chord length corresponding to the central axis of the immersed tube to be installed is I, and the axial deviation generated at the tail end of the immersed tube to be installed is Z3. ’ for: Z3 ’ =Isin(α-β) (4) Simultaneously, the tail-end axis deviation Z generated by subsequent pipe sections can be derived. 3n ’ Z 3n ’ =Z gw3(n-1) + I n sin(α)n -β n +γ n ) S4. Calculate the axial deflection angle γ caused by the installed pipe section: Due to factors such as installation positioning deviation, hydraulic pressure connection, and GINA compression, the final posture of the installed pipe sections may change. Based on the results of the through-line measurement, it is necessary to re-estimate the alignment of subsequent pipe sections and analyze the installation plan for the pipe sections to be installed.

[0019] Calculate the axial deviation Z at the beginning of the installed pipe section using the planar through-measurement method. gs The deviation Z of the tail end axis of the installed pipe section gw Then the axial deviation angle γ of the installed pipe section is: γ=arcsin[(Z gw -Z gs ) / I] (5) The planar through-measurement method is used to calculate the axial deviation Z at the beginning of the installed pipe section. gs The deviation Z of the tail end axis of the installed pipe section gw This is a relatively conventional calculation method in the prior art, and will not be described in detail in this application.

[0020] S5. Calculate the axial deviation angle caused by the installed pipe section and the tail end axial deviation Z3 caused by the pipe section to be installed: Based on the axial deviation angle α-β generated by the end steel shells at both ends of the immersed tube to be installed as described in step S3, and the axial deviation angle γ generated by the installed tube section as described in step S4, the axial deviation angle of the immersed tube to be installed is obtained as α-β+γ. Therefore, the axial deviation Z3 is: Z3=Z gw + Isin(α-β+γ) (6) S6. Based on the deviation results obtained in steps S1, S2, and S5, perform pre-control of the alignment of the immersed tube to be installed and calculate the deviation Z of its tail end axis. E , Z E =Z1+Z2+Z3(7) If Z E If the limit is exceeded, a staggered tooth is installed at the head end of the immersed tube to be installed in order to control the axial deviation of the immersed tube installation. When 0≤Z E When the diameter is less than 5cm, the first end of the pipe to be installed is completely aligned with the last end of the installed pipe. When the Z... E When the diameter is ≥5cm, the first end of the immersed tube to be installed is fitted with staggered teeth to control the axial deviation within a controllable range.

[0021] According to formula (6), the tail end axis deviation Z generated by the subsequent pipe section can be obtained.3n for: Z 3n =Z gw3(n-1) + I n sin(α) n -β n +γ n ) According to formula (7), the deviation Z of the tail end axis of the subsequent pipe section can be obtained. En for Z En =Z 1n +Z 2n +Z 3n When the Z En When the deviation is ≥5cm, the first n-1 sections of the immersed tube need to be installed with misaligned teeth to control the deviation of the immersed tube axis within a controllable range. Assuming the installation alignment of 6 sections is calculated, since the deviations of the 6 sections are cumulative, the axis deviation will be much larger by the 6th section. Therefore, it is necessary to adjust it little by little during the installation of the first 5 sections.

[0022] The final estimated results are reflected in the axial deviation of the last section of the immersed tunnel under the combined influence of these deviations, and then a control scheme for the alignment of the immersed tunnel installation is formulated based on the estimated results.

[0023] Based on the above estimates, misalignment during the installation of the immersed tube can be controlled, thereby achieving the goal of controlling the axial deviation without changing the installation line angle. After each tube section is installed and the through measurement results are obtained, the axial deviation of the subsequent tube sections can be recalculated.

[0024] This technical solution provides a method for pre-controlling the installation alignment of long, high-curvature immersed tunnel sections, offering an effective verification tool for underwater measurement work that is difficult to control. By pre-controlling the subsequent installation alignment of the immersed tunnel, the axial deviation and mileage of subsequent tunnel sections are estimated mainly by using data from the prefabrication of the immersed tunnel and the actual attitude data of the installed tunnel sections. At the same time, appropriate control is carried out based on the estimated data during the installation of the tunnel sections to be installed, reducing the installation risk of the final joint and ensuring that the deviation of the immersed tunnel installation alignment is within a controllable range.

[0025] This avoids the problems caused by excessive line deviation angle or the large misalignment between the subsequent pipe section and the previous pipe section due to the superposition of line deviation, as well as the GINA compression and hydraulic pressing processes.

[0026] The feature point data were all obtained by total station calibration on land. Its measurement accuracy is higher than that of GPS positioning measurement at sea. Except for the uncontrollable factors of the underwater docking construction process that affect the accuracy, its data can be fully used to verify the positioning data of the measurement and control system.

[0027] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for pre-controlling the alignment of immersed tunnel sections with large curvature during installation, characterized in that, Assuming the first end of the tunnel segment to be installed is perfectly aligned with the last end of the already installed tunnel segment, the axial deviation of the last end of the tunnel segment to be installed is calculated, including the following steps: S1. Calculate the axial deviation Z1 caused by the prefabricated length of the immersed tube to be installed: After the prefabrication of the immersed tube to be installed is completed, the length L of the central axis of the immersed tube to be installed is obtained. The angle between the line connecting the centers of the first and last ends of the top plate of the immersed tube to be installed and the perpendicular lines of the first and last end steel shells is denoted as ∠A. Then: 2A = 180L / πR (1) Where R is the radius of curvature of the immersed tube to be installed; L is the length of the central axis of the immersed tube to be installed; According to the Law of Cosines, we can obtain: (Z1+R) 2 =S 2 +R 2 -2SRcos(180°-2A) (2) Where S is the mileage deviation caused by the prefabricated length of the immersed tube to be installed; S2. Calculate the axial deviation Z2 caused by the prefabrication of the immersed tube to be installed: Based on the relative positional relationship of the feature points on the top plate of the immersed tube to be installed, the relative positions of the center points of the first and last ends of the immersed tube to be installed are obtained respectively. Then, the lateral deviation Zs of the center point of the first end of the immersed tube to be installed from its designed position and the lateral deviation Zw of the center point of the last end from its set position are obtained. Then, the axial deviation Z2 generated by the prefabrication of the immersed tube to be installed is: Z2=Zw-Zs (3) S3. Calculate the axial deviation Z3 caused by the lateral inclination angle of the steel shells at both ends of the immersed tube. ’ ; By arranging a ring of feature points on the end steel shells at the beginning and end of the immersed tube, simultaneously fitting the end face, and calculating the angle between the fitted surface and the designed end steel shell, the lateral inclination angle of the end steel shells at the beginning and end of the tube section can be obtained. The lateral inclination angle of the end steel shell at the beginning of the immersed tube to be installed is α, and the inclination angle of the end steel shell at the end of the installed tube section is β. Therefore, the axial deviation angle generated by the end steel shells at the beginning and end of the immersed tube to be installed is α-β, the chord length corresponding to the central axis of the immersed tube to be installed is I, and the axial deviation generated at the end of the immersed tube to be installed is Z3. ’ for: Z3 ’ =Isin(α-β) (4) S4. Calculate the axial deflection angle γ caused by the installed pipe section: Using planar penetration measurement to measure the axial deviation Z at the beginning of the installed pipe section gs The deviation Z of the tail end axis of the installed pipe section gw Then the axial deviation angle γ of the installed pipe section is: γ=arcsin[(Z gw -WITH gs ) / I] (5) S5. Calculate the axial deviation angle caused by the installed pipe section and the tail end axial deviation Z3 caused by the pipe section to be installed: Based on the axial deviation angle α-β generated by the end steel shells at both ends of the immersed tube to be installed as described in step S3, and the axial deviation angle γ generated by the installed tube section as described in step S4, the axial deviation angle of the immersed tube to be installed is obtained as α-β+γ. Therefore, the axial deviation Z3 is: Z3=Z gw + Isin(α-β+γ) (6) S6. Based on the deviation results obtained in steps S1, S2, and S5, perform pre-control of the alignment of the immersed tube to be installed and calculate the deviation Z of its tail end axis. E , WITH E =Z1+Z2+Z3(7) If Z E If the limit is exceeded, a staggered tooth is installed at the head end of the immersed tube to be installed in order to control the axial deviation of the immersed tube installation.

2. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 1, characterized in that, In step S1, the calculation process for the mileage deviation S caused by the prefabricated length of the immersed tube to be installed is as follows: The designed length of the central axis of the immersed tube to be installed is L. 设计 Then the length deviation Z L for: Z L =L-L 设计 (8) After the immersed tunnel is installed, the actual mileage of the immersed tunnel installation is measured as L1 through a through-measurement. The mileage deviation S is: S=Z L +L1(9)。 3. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 2, characterized in that, In step S1, feature points are set up on the top and bottom plates of the first and last ends of the immersed tube to be installed. The relative positional relationship of each feature point is measured using a total station, and the length L of the central axis of the immersed tube to be installed is calculated.

4. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 1, characterized in that, In step S3, the axial deviation Z3 is determined based on the lateral tilt angle of the steel shells at both ends of the immersed tube to be installed. ’ By analogy, the axial deviation Z caused by the lateral inclination angle of the steel shells at both ends of the subsequent pipe sections can be obtained. 3n ’ : WITH 3n ’ =Z 3(n-1) ’ +I n sin(α n -β n )。 5. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 4, characterized in that, In step S5, based on the axial deviation angle generated by the installed pipe section and the tail end axial deviation Z3 generated by the pipe section to be installed, the tail end axial deviation Z for subsequent pipe sections is obtained. 3n Z 3n =Z gw3(n-1) + I n sin(a) n -b n +g n ).

6. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 1, characterized in that, The deviation of the tail end axis of the subsequent pipe section Z E for WITH En =Z 1n +Z 2n +Z 3n 。 7. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 5, characterized in that, When 0≤Z E When the diameter is less than 5cm, the first end of the pipe to be installed is completely aligned with the last end of the installed pipe. When the Z... E When the diameter is ≥5cm, the first end of the submerged tube to be installed is installed with a staggered tooth to the last end of the already installed submerged tube.

8. The method for pre-controlling the alignment of immersed tunnel sections with large curvature as described in claim 6, characterized in that, When the Z En When the deviation is ≥5cm, the first n-1 sections of the immersed tube need to be fitted with staggered teeth to control the deviation of the immersed tube axis within a controllable range.

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