Large-diameter super-long permanent steel casing sinking positioning system and construction method thereof

Abstract

The invention discloses a large-diameter super-long permanent steel casing sinking positioning system and a construction method thereof. The large-diameter super-long permanent steel casing sinking positioning system comprises an adjustable lifting guide frame, an inner wall supporting component and a positioning monitoring and dynamic closed-loop deviation rectifying system. The guide frame is a double-layer guide frame with adjustable height so as to meet the sinking of steel casings with different lengths; transverse support members are arranged on the inner wall of the steel casing at equal intervals to prevent water pressure difference between the inside and outside of the steel casing at the deepwater position or local deformation under the action of impact load; the monitoring and dynamic closed-loop correction system comprises a total station scanner and a double-shaft inclinometer, the plane position and perpendicularity of the steel casing are fed back in real time, the steel casing is fixed through an automatic position adjusting jack and a V-shaped pressing block, the plane position and perpendicularity of the steel casing are dynamically corrected in real time, and it is ensured that the top face of the casing meets the construction standard. According to the positioning system and the construction method thereof, the technical problems of poor adaptability, low positioning precision, delayed deviation correction response and the like in the sinking process of a large-diameter super-long steel casing in a complex stratum in a deepwater area can be solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of permanent steel casing sinking construction, and particularly relates to a large-diameter super-long permanent steel casing sinking positioning system and a construction method thereof. BACKGROUND

[0002] At present, the existing steel casing positioning device and construction method still have many deficiencies. For example, when constructing in deep water, the mechanical access is difficult, the construction platform lifting load is limited, the structure of part of the positioning device is complex, and the installation and debugging are difficult, which is difficult to adapt to the complex working environment of deep water; the height of the guide frame of the existing device is mostly fixed, which cannot be flexibly adapted to steel casings of different lengths, and when replacing casings of different specifications, the guide frame often needs to be replaced as a whole, which not only has high equipment cost and long replacement period, but also seriously affects the construction efficiency; the monitoring means is relatively single, and relies on manual re-measurement, lacks real-time automatic monitoring system, especially when constructing in flow plastic silt layer, the casing is easy to be affected by the sudden change of stratum lateral pressure and deviate instantaneously, the hysteresis of manual re-measurement is easy to cause deviation exceeding the standard, and then causes rework and increases construction cost; the deviation correction response has a lag, the jack control is mostly manually operated, and the construction efficiency and precision of part of the positioning method are low, which is difficult to realize real-time monitoring and dynamic adjustment in the steel casing sinking process. In addition, for the complex stratum conditions such as deep water environment, soft silt layer, dense boulders or large block protruding rock mass, and large inclination of surface in deep water large-diameter super-long steel casing construction, the corresponding construction process still needs to be further optimized. Therefore, it has important engineering application value to develop a deep water complex stratum large-diameter super-long permanent steel casing sinking intelligent positioning system and a construction method thereof which integrates automatic monitoring and dynamic deviation correction and is suitable for deep water complex stratum. SUMMARY

[0003] The present application aims to provide a deep water complex stratum large-diameter super-long permanent steel casing sinking intelligent positioning system and a construction method thereof which comprises an adjustable lifting guide frame system, an automatic monitoring system, a steel casing inner wall support system and an intelligent deviation correction system, so as to solve the problems of low positioning precision, difficulty in real-time monitoring and adjustment of deviation in the prior art when constructing in deep water complex stratum.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: A large-diameter super-long permanent steel casing sinking positioning system comprises an adjustable lifting guide frame, an inner wall support member, a positioning monitoring and dynamic closed-loop deviation correction system. The adjustable lifting guide frame has a horizontal sliding steel plane inside, which can move up and down vertically. Three horizontal adjusting jacks are fixed inside the sliding steel plane, arranged in a triangle with their heads pointing towards the center of the sliding steel plane. V-shaped pressure blocks are connected to the heads of the adjusting jacks, which are used to clamp the steel casing. Three more horizontal adjusting jacks are also provided at the bottom of the adjustable lifting guide frame, corresponding vertically to the adjusting jacks on the sliding steel plane. These adjusting jacks are used to clamp and adjust the steel casing. The inner wall support component is located inside the steel casing and includes a support core rod arranged vertically along the axis of the steel casing. Several support short rod groups are equidistantly arranged on the support core rod. Each support short rod group includes multiple support short rods arranged radially. The head end of the support short rod abuts against the inner wall of the steel casing to provide support for the steel casing and prevent local deformation caused by water pressure difference between the inside and outside of the large-diameter steel casing in deep water or under impact load. The positioning monitoring and dynamic closed-loop correction system includes a total station scanner, a dual-axis inclinometer, and a controller. The adjustment jack is connected to the controller via a signal connection. The dual-axis inclinometer monitors the casing deflection angle θ and transmits the data to the controller. The controller controls the extension and retraction of the adjustment jack to adjust the inclination angle. The total station scans and measures the marked measuring points on the steel casing to correct the controller's adjustment.

[0005] Furthermore, the adjustable lifting guide frame system includes an upper steel frame, a lower steel frame, an inclined steel frame, a longitudinal support plate, and a sliding steel plane; the inclined steel frame and the longitudinal support plate are connected between the upper steel frame and the lower steel frame, the longitudinal support plate forms a rectangular frame, and the inclined steel frame forms an inclined support; the sliding steel plane is located within the rectangular frame and can slide up and down in the vertical direction.

[0006] Furthermore, motor winches are installed at the top of the four corners of the upper steel frame, which are used to drive the sliding steel plane to move.

[0007] Furthermore, a vertical slide rail is provided on the inner side of the longitudinal support plate, and a sliding roller is provided on the outer side of the sliding steel plane. The sliding roller contacts the slide rail, thereby reducing the movement resistance of the sliding steel plane.

[0008] Furthermore, the web of the longitudinal support plate is provided with several fixed screw holes spaced vertically, and locking pins are installed in the fixed screw holes; after the height of the longitudinal support plate is adjusted, the position of the sliding steel plane is fixed by the locking pins.

[0009] Furthermore, a level is provided on each of the four sides of the sliding steel plane to ensure the horizontal state of the sliding steel plane when it slides and rises, and to assist in monitoring the horizontal state of this adjustable lifting guide frame during construction.

[0010] Further, the positioning jack of the dynamic deviation correction system is equipped with a rubber V-shaped pressing block for fixing the steel casing, the rear side of the positioning jack is provided with a counterforce seat, and the positioning jack and the rubber V-shaped pressing block are connected by a connecting device; the anti-skid lines on the surface of the rubber layer are isosceles triangular sections, the direction of the lines is parallel to the axis of the steel casing, and the radial friction is increased.

[0011] Further, the head end of the support short rod is provided with a pulley, and the pulley is in contact with the inner wall of the steel casing.

[0012] A large-diameter super-long permanent steel casing sinking positioning construction method, comprising a large-diameter super-long permanent steel casing sinking positioning system, the double-axis inclinometer monitors the deviation angle θ of the steel casing, transmits data to the controller, and the controller determines whether θ is greater than or equal to 3 ‰; if the condition is met, the controller calculates the jack thrust F = K θ, K is a coefficient determined according to the actual situation, and then controls the positioning jack to adjust the position; after adjustment, the deviation angle θ' is re-measured and fed back to the controller, and the controller determines whether θ' is less than or equal to 3 ‰; if the condition is met, the deviation correction is stopped; if the condition is not met, the deviation correction operation is continued, and the cycle is repeated to realize real-time dynamic feedback and dynamic adjustment, and the super-long permanent steel casing is always kept in real-time adjustment and accurate positioning during the construction process.

[0013] The specific steps are as follows: A, construction preparation and platform positioning. Complete the assembly and debugging of the adjustable lifting guide frame system, ensure that each sliding part, motor winch, positioning jack system and monitoring instrument are working properly. The assembled guide frame system is hoisted to the construction platform, and is connected with the platform through the guide frame fixing screw holes at the bottom of the lower steel frame. Install, calibrate and establish data transmission link for the positioning monitoring system (total station and double-axis inclinometer), and ensure that the display terminal can receive data in real time.

[0014] B, guide frame positioning and height adjustment. According to the designed pile position, use the total station to preliminarily position the guide frame, so that the center line is roughly aligned with the pile center. According to the length of the steel casing to be sunk, start the motor winch to adjust the height of the sliding steel plane. Through the cooperation of the sliding rail and the sliding roller, it is lifted to the predetermined position. During the adjustment process, observe the level of the four sides of the sliding steel plane to ensure that it is in a horizontal state. After reaching the predetermined height, the locking bolt is inserted into the fixed screw hole of the longitudinal support plate to fix and lock the sliding steel plane.

[0015] C. Steel casing hoisting and fixing. First, set the inner wall support member inside the steel casing. Then, use large lifting equipment to vertically lift the permanent steel casing, slowly lower it, and make it pass through the center hole of the upper steel frame and the sliding steel plane in sequence. When the lower end of the steel casing approaches the riverbed or the initial design elevation, operate the positioning jack on the sliding steel plane and the lower steel frame to make the V-shaped block on the top gently contact and clamp the outer wall of the steel casing, and preliminarily constrain and fix it.

[0016] D. Precise positioning and initial adjustment of verticality. Start the positioning monitoring system, and the total station instrument scans and measures the steel casing mark measurement points, while the dual-axis inclinometer installed on the top of the steel casing starts to monitor the inclination angle (offset angle θ) and radial displacement of the casing in real time. According to the scanning results of the total station instrument and the real-time data (plane position and verticality) fed back by the monitoring system, the control system adjusts the jacking force of the positioning jacks at each position to accurately adjust the plane position and verticality of the steel casing, making it close to the design position and verticality requirements.

[0017] E. Dynamic sinking and closed-loop correction. Start the sinking equipment such as the vibration hammer, and the controller judges whether the offset angle θ is greater than or equal to the control standard of 3‰. If the condition is met, the required jacking force F is automatically calculated according to the preset algorithm (for example, F = K・θ), and the positioning jacks at the corresponding positions are controlled to be linked to dynamically correct the attitude of the steel casing. After correction, the system immediately re-measures the offset angle θ', and feeds it back to the controller. The controller judges whether θ' is less than or equal to 3‰. If it is satisfied, the correction is stopped; if it is not satisfied, the correction operation is continued. The scanning measurement of the steel casing mark measurement points by the total station instrument is performed during the sinking process of the steel casing to correct the adjustment of the controller. This process is repeated to realize real-time dynamic feedback and adjustment during the whole sinking process.

[0018] F. Steel casing lengthening and welding. When the first section of the steel casing is sunk to the height connection position, the sinking is paused and the guiding frame is used to stabilize it, the next section of the steel casing is hoisted to ensure that the axis is coincident and the interface is smooth. After adjustment, temporary spot welding is performed, and then the ring seam is formally welded according to the process requirements. Symmetrical and layered operation is required during welding, and the attitude of the steel casing is monitored in real time, and necessary micro-adjustment is made to control the welding deformation.

[0019] G. Repeat the above steps A~F to sink the entire steel casing to the design elevation.

[0020] H. Steel casing positioning review and system dismantling. After the steel casing is sunk to the design elevation, the final plane position and verticality of the steel casing are reviewed again using the total station instrument and the inclinometer to ensure that the top surface error is ≤5 cm and the verticality is ≤3‰, meeting the construction standards.

[0021] In deep water area, for different complex strata that may be encountered, corresponding special construction measures are adopted: for deep water and soft silt layer, the steel casing is mainly relied on its own weight to control its uniform sinking; for the stratum with dense boulders or large protruding rocks, a large diameter drilling machine is used to drill a pre-hole first, and then the steel casing is made to follow under the control of the guide frame; for the inclined rock stratum with large surface inclination, a "honeycomb hole" is drilled in the inclined area by using a down-the-hole drill first, and then an impact drill is used to drill, the "honeycomb hole" can be engaged with the blade foot of the impact drill bit, effectively preventing the drill bit from sliding along the inclined direction of the rock surface, thereby avoiding the complex process of using backfilling stone to flatten the inclined surface of the rock. For the above special stratum conditions, the load applied to the steel casing follows the principle of static and dynamic load combination and stage control.

[0022] The beneficial effects of the present application are: 1. The guide frame has strong adaptability and efficient and economical construction. The adjustable lifting guide frame is simple and reliable, easy to assemble and disassemble; the height of the sliding steel plane can be adjusted, which can adapt to steel casings of different lengths without the need for overall replacement, significantly improving the versatility and construction efficiency; automatic operation reduces the dependence on manpower and saves labor costs; the guide frame can be reused, and the recyclable design of the internal support system further reduces material consumption.

[0023] 2. The deviation correction structure is reasonably designed and has wide application range. On the sliding steel plane, three positioners are evenly arranged at 120°, which conforms to the geometric principle of three-point determination of a plane, making the correction process more accurate and efficient; the V-shaped block equipped through the connecting device at the end of the jack can better adapt to steel casings of different diameters, enhancing the versatility of the system.

[0024] 3. Intelligent dynamic correction is realized, with high precision and fast response. The system forms a closed-loop control based on deviation feedback, which can automatically calculate and drive the jack linkage correction. The traditional lagging manual adjustment is upgraded to real-time dynamic control, ensuring high precision throughout the sinking process. The automatic correction responds quickly, significantly reducing the risk of rework caused by deviation accumulation, and improving the construction reliability and economy.

[0025] 4. The matching process has strong pertinence and effectively deals with complex strata. Combined with the intelligent positioning system, special processes for complex strata such as boulders and inclined rocks are optimized, such as pre-drilling boulders and using "honeycomb holes" with impact drills to overcome inclined rock surfaces, effectively preventing drill bit sliding and avoiding the complexity and uncertainty of traditional backfilling stone processes, improving construction efficiency and safety. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural diagram of the steel casing sinking positioning system of the present application; Figure 2 Structure diagram of adjustable lifting guide frame of the present application; Figure 3 Connection diagram of sliding steel plane of the present application; Figure 4 Structure diagram of adjustable lifting control of the present application; Figure 5 Structure diagram of jack and V-shaped pressing block of the present application; Figure 6 Structure diagram of mechanical fixing of locking bolt of the present application; Figure 7 Three-dimensional diagram of steel casing support core rod of the present application; Figure 8 Structure diagram of steel casing support core rod of the present application; Figure 9 Structure diagram of steel casing support core rod of the present application; Figure 10 Structure diagram of position adjusting and deviation correcting control of the present application; Figure 11 Structure diagram of total station scanning method of the present application; Figure 12 Working principle diagram of deviation correcting system of the present application; In the figure, 1 is upper layer steel frame body, 2 is inclined steel frame body, 3 is longitudinal support plate, 4 is lower layer steel frame body, 5 is sliding steel plane, 6 is sliding roller, 7 is sliding rail, 8 is motor winch, 9 is level, 10 is fixed positioning screw hole, 11 is position adjusting jack, 12 is V-shaped pressing block, 13 is fixed screw hole, 14 is locking bolt, 15 is pulley fixing device, 16 is pulley limiting box, 17 is jack counterforce seat, 18 is connecting device, 19 is steel casing, 20 is support core rod, 21 is support short rod, 22 is pulley, and 23 is double-shaft inclination instrument. DETAILED DESCRIPTION

[0027] The present application will be further described below in combination with the accompanying drawings and examples: In actual construction, first, bolt holes corresponding to fixed holes of lower layer I-beam are preset at construction platform, and guide frames are fixed at steel casing construction position through eight symmetrically arranged fixed screw holes 13 of lower layer steel frame body 4, so that the guide frame of the present application is installed on construction platform in deep water area and its position is ensured to be accurate and fixed firmly.

[0028] Then, as shown in FIG. 2, the guide frame is fixed on the construction platform in deep water area, and the position is ensured to be accurate and fixed firmly. Figure 1Assemble the upper steel frame body 1, the longitudinal support plate 3 connecting the upper and lower frame bodies, and the diagonal steel frame body 2 for supporting and stabilizing the upper and lower frame bodies. Install the slide rail 7 and the motor winch 8, then assemble the sliding steel plane 5, install the sliding rollers 6, embed them in the slide rail 7, connect the steel wire rope of the motor winch 8, and finally test the smoothness of the lifting and the stability of the device.

[0029] Install a positioning system, i.e., the positioning jack 11 and the V-shaped pressing block 12 at its top, inside the lower steel frame body 4 and the sliding steel plane 5. For steel cylinders of different lengths, adjust the height of the sliding steel plane 5 through the height adjustment mechanism, and use the locking pin 14 to fix and lock the sliding steel plane 5. Finally, install the large-diameter and super-long permanent steel cylinder in the guide frame and fix it with the V-shaped pressing block 12 to make the steel cylinder and the guide frame closely combined.

[0030] Set a biaxial inclinometer 23 at the top of the super-long steel cylinder 19 and connect it to the data acquisition device; and set a support core rod 20 at its central position, and equidistantly set support short rods 21 on the support core rod 20. There are 8 support short rods 21 arranged in a "rice" shape at each place, and pulleys 22 are provided at the tops of the support short rods 21. During the sinking process of the super-long steel cylinder 19, the inner wall support system remains at a constant depth and always supports the inner wall of the steel cylinder 19 at the same depth during the sinking process.

[0031] Turn on the positioning monitoring system. The biaxial inclinometer 23 real-time collects the inclination angle of the steel cylinder, and these data are transmitted to the data processing module through the data acquisition module. The data processing module analyzes and processes the collected data, calculates the deviation between the actual position and the designed position of the steel cylinder, and transmits the deviation data to the display module and the controller.

[0032] Construction workers observe the positioning situation of the steel cylinder through the display module. When the deviation data received by the controller meets the deviation correction condition, that is, when the deflection angle θ of the steel cylinder monitored by the biaxial inclinometer is greater than or equal to 3‰ or the coordinate deviation is greater than or equal to 5 cm, the controller calculates the jack thrust F according to the formula F = K・θ (K is a coefficient determined according to the actual situation), and controls the linkage of the jacks to push the V-shaped pressing block to adjust the position and correct the offset of the steel cylinder. After correction, the biaxial inclinometer monitors the deflection angle θ' of the steel cylinder again and feeds the data back to the controller. The controller judges whether θ' is less than or equal to 3‰. If the condition is met, the deviation correction is stopped; if the condition is not met, the deviation correction operation continues until the deflection angle and coordinate deviation of the steel cylinder meet the construction requirements. During the sinking process of the steel cylinder, the total station is used to scan and measure the marked measuring points of the steel cylinder to calibrate the adjustment of the controller. During the entire sinking process, the positioning monitoring and deviation correction system continuously works to monitor and adjust the position of the steel cylinder in real time to ensure the accurate sinking of the large-diameter and super-long permanent steel cylinder in the complex formation of deep water areas.

[0033] In deep water area, for different complex strata, corresponding special construction measures are adopted: for deep water and soft silt layer, the steel casing is mainly relied on its own weight to control its uniform sinking; for the strata with dense boulders or large protruding rocks, a large diameter drill is used to drill a hole first, and then the steel casing is made to follow under the control of the guide frame; for the inclined rock strata with large inclination, a "honeycomb hole" is drilled in the inclined area first, and then the percussion drill is used to drill, the "honeycomb hole" can be engaged with the blade foot of the percussion drill bit, effectively preventing the drill bit from sliding along the inclined direction of the rock surface, thereby avoiding the complex process of using backfilling stone to flatten the inclined rock surface. For the above special strata conditions, the load of the steel casing is applied in accordance with the principle of static and dynamic load combination and stage control.

[0034] The present patent solves the problem of steel casing positioning in deep water area through mechanical constraint-monitoring-execution triple innovation. The above description is only the preferred embodiment of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0035] Implementation case: A certain bridge of Bailongjiang crosses a reservoir inundation area of Bailongjiang, wherein the bridge pier and foundation in deep water area are designed with Φ2.8 m large diameter pile foundation, and the longest pile length reaches 88 m. The reservoir water level fluctuation depth at the bridge site is 10-20 m, and the siltation depth is 25-56 m, which is difficult for construction. The strata at the bridge site are mainly Quaternary Holocene alluvial-proluvial medium-fine sand, silt, gravel (pebble), metamorphic sandstone, etc., and the strata geological conditions are complex. The pile foundation is constructed with a permanent steel casing for auxiliary construction, the longest designed steel casing is 76 m long, the inner diameter is 3.0 m, and the wall thickness is 25.0 mm. In the process of steel casing construction of pile foundation in deep water area with complex geological conditions, how to ensure the sinking accuracy (plane position and verticality) of the steel casing and accurately punch into the designed position of the rock stratum is the key and difficulty of steel casing construction.

[0036] To solve the above problems in the construction process, a large-diameter super-long permanent steel casing sinking intelligent positioning system and construction method for complex strata in deep water area is developed, which organically combines mechanical design, sensing monitoring, automatic control and special construction technology, forming a complete, intelligent and efficient steel casing sinking solution. It fundamentally changes the traditional construction mode which relies on manual experience and delayed response. It significantly improves the construction accuracy, efficiency and safety in complex environments such as deep water, soft silt, boulders and inclined rock. It realizes the visualization, quantification and controllability of the construction process, provides an advanced technical example for the standardized and intelligent construction of large-scale water pile foundation engineering, and has important popularization and application value.

Claims

1. A large-diameter, ultra-long permanent steel casing sinking and positioning system, characterized in that, Includes adjustable lifting guide frame, inner wall support components, positioning monitoring and dynamic closed-loop correction system; The adjustable lifting guide frame is provided with a horizontal sliding steel plane (5), which can move up and down in the vertical direction; three horizontal adjustment jacks (11) are fixed on the inner side of the sliding steel plane (5), the three adjustment jacks (11) are arranged in a triangle and their heads point to the center of the sliding steel plane (5), and the heads of the adjustment jacks (11) are connected to V-shaped pressure blocks (12), which are used to clamp the steel casing (19); the lower part of the adjustable lifting guide frame is also provided with three horizontal adjustment jacks (11), which correspond one-to-one with the adjustment jacks (11) on the sliding steel plane (5) in the vertical direction; the adjustment jacks (11) are used to clamp and adjust the steel casing; The inner wall support component is located inside the steel casing (19) and includes a support core rod (20) arranged vertically along the axis of the steel casing. Several support short rod groups are equidistantly arranged on the support core rod (20). The support short rod group includes multiple support short rods (21) arranged radially. The head end of the support short rod (21) abuts against the inner wall of the steel casing (19) to provide support for the steel casing (19) and prevent water pressure difference between the inside and outside of the large-diameter steel casing (19) in deep water or local deformation under impact load. The positioning monitoring and dynamic closed-loop correction system includes a total station scanner, a dual-axis inclinometer (23), and a controller. The adjustment jack (11) is connected to the controller via signal. The dual-axis inclinometer (23) monitors the casing deviation angle θ and transmits the data to the controller. The controller controls the adjustment jack (11) to extend and retract to adjust the inclinometer angle. The total station scanning method is used to detect the verticality of the steel casing during the insertion and sinking process, and to calibrate the adjustment of the controller.

2. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 1, characterized in that, The adjustable lifting guide frame system includes an upper steel frame (1), a lower steel frame (4), an inclined steel frame (2), a longitudinal support plate (3), and a sliding steel plane (5); the inclined steel frame (2) and the longitudinal support plate (3) are connected between the upper steel frame (1) and the lower steel frame (4), the longitudinal support plate (3) forms a rectangular frame, and the inclined steel frame (2) forms an inclined support; the sliding steel plane (5) is located within the rectangular frame and can slide up and down in the vertical direction.

3. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 2, characterized in that, The top of the four corners of the upper steel frame (1) is equipped with motor winches (8), which are used to drive the sliding steel plane (5) to move.

4. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 3, characterized in that, The longitudinal support plate (3) is provided with a vertical slide rail (7) on the inner side, and a sliding roller (6) is provided on the outer side of the sliding steel plane (5). The sliding roller (6) contacts the slide rail (7) and reduces the movement resistance of the sliding steel plane (5) through the sliding roller (6).

5. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 3, characterized in that, The web of the longitudinal support plate (3) has several fixed screw holes (10) spaced vertically, and a locking pin (14) is installed in the fixed screw hole (10); after the height of the longitudinal support plate (3) is adjusted, the position of the sliding steel plane (5) is fixed by the locking pin (14).

6. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 1, characterized in that, The sliding steel plane (5) is equipped with a level (9) on each of its four sides to ensure the horizontal state of the sliding steel plane (5) when it slides up and down, and to assist in monitoring the horizontal state of the adjustable lifting guide frame during construction.

7. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 1, characterized in that, The adjustment jack (11) of the dynamic correction system is equipped with a rubber V-shaped pressure block (12) for fixing the steel casing. A reaction seat (17) is provided on the rear side of the adjustment jack (11). The adjustment jack (11) and the rubber V-shaped pressure block (12) are connected by a connecting device (18). The anti-slip texture on the surface of the rubber layer is an isosceles triangular cross section, and the texture direction is parallel to the axis of the steel casing (19) to increase the radial friction force.

8. The large-diameter, ultra-long permanent steel casing sinking and positioning system according to claim 1, characterized in that, The head end of the support rod (21) is equipped with a pulley (22), which contacts the inner wall of the steel casing (19).

9. A method for sinking and positioning large-diameter ultra-long permanent steel casing, comprising the sinking and positioning system for large-diameter ultra-long permanent steel casing as described in any one of claims 1-8, characterized in that, The dual-axis inclinometer (23) monitors the deflection angle θ of the steel casing (19) and transmits the data to the controller. The controller determines whether θ is greater than or equal to 3‰. If the condition is met, the controller calculates the jack thrust F=K・θ, where K is a coefficient determined according to the actual situation. Then, the controller controls the adjustment jack (11) to adjust the position in linkage. After adjustment, the deflection angle θ' is remeasured and fed back to the controller. The controller determines whether θ' is less than or equal to 3‰. If the condition is met, the correction stops. If the condition is not met, the correction operation continues. This cycle is repeated to achieve real-time dynamic feedback and dynamic adjustment, ensuring that the ultra-long permanent steel casing maintains instant adjustment and accurate positioning during construction.

10. The method for sinking and positioning a large-diameter, ultra-long permanent steel casing according to claim 9, characterized in that, The construction method includes the following steps: A. Construction preparation and platform placement: Complete the assembly and debugging of the adjustable lifting guide frame system to ensure that each component works normally; hoist the assembled adjustable lifting guide frame onto the construction platform and fix it; install and calibrate the total station and dual-axis inclinometer (23); and establish a data transmission link to ensure that the display terminal can receive data in real time. B. Positioning and Height Adjustment of Guide Frame: According to the designed pile position, the adjustable lifting guide frame is initially positioned using a total station so that its centerline is aligned with the pile center; according to the length of the steel casing to be laid, the motor winch (8) is started to adjust the height of the sliding steel plane (5). During the adjustment process, the level (9) on all four sides is observed to ensure that it is in a horizontal state. After reaching the predetermined height, the sliding steel plane is fixed and locked by inserting the locking pin (14) into the fixing screw hole (10) of the longitudinal support plate (3). C. Steel casing hoisting and fixing: First, install inner wall support components inside the steel casing; then use lifting equipment to vertically hoist the permanent steel casing and slowly lower it so that it passes through the central holes of the upper steel frame (1) and the sliding steel plane (5) in sequence; when the lower end of the steel casing is close to the riverbed or the predetermined initial elevation, operate the adjusting jacks (11) on the sliding steel plane (5) and the lower steel frame (4) so ​​that the V-shaped pressure block (12) gently contacts and clamps the outer wall of the steel casing, and initially constrains and fixes it; D. Precise positioning and initial verticality adjustment: Start the positioning monitoring system, and the total station scans and measures the marked measuring points of the steel casing. At the same time, the dual-axis inclinometer (23) installed on the top of the steel casing starts to monitor the tilt angle and radial displacement of the casing in real time. Based on the scanning results of the total station and the real-time data fed back by the monitoring system, the jacking force of the adjusting jacks (11) at each position is finely adjusted by the controller to make the planar position and verticality of the steel casing precise initial adjustment so that it is close to the design position and verticality requirements. E. Dynamic sinking and closed-loop correction: When the sinking equipment is started, the controller determines whether the deviation angle θ is greater than or equal to the control standard of 3‰. If the condition is met, the corresponding adjustment jack (11) is controlled to perform linkage to dynamically correct the attitude of the steel casing. After correction, the system immediately remeasures the deviation angle θ' and feeds it back to the controller. The controller determines whether θ' is less than or equal to 3‰. If it is met, the correction is stopped. If it is not met, the calculation and correction operation continue. This process is repeated to realize real-time dynamic feedback and adjustment of the entire sinking process. F. Steel casing extension welding: When the first section of the steel casing is lowered to the extension position, the lowering is paused and the adjustable lifting guide frame is used to stabilize it. The next section of the steel casing is then hoisted to ensure that the axis is aligned and the joint is smooth. After adjustment, temporary spot welding is performed, and then the formal circumferential weld is completed according to the process requirements. During the welding process, symmetrical and layered operations are required, and the posture of the steel casing is monitored in real time. If necessary, fine adjustments are made to control welding deformation. G. Repeat steps A to F above to lower the entire steel casing to the design elevation; H. Steel casing positioning verification and system dismantling: After the steel casing is lowered to the design elevation, its final planar position and verticality are verified again using a total station and inclinometer to ensure that the construction standards are met.

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