Large-span narrow prefabricated box girder erection device in complex environment and construction method

Abstract

The invention relates to the technical field of bridge engineering construction, in particular to a complex environment large-span narrow prefabricated box girder erecting device and construction method.The device comprises a lifting appliance, an adjustable supporting rod, a temporary supporting base and a three-dimensional installation deviation rectifying trolley; the lifting end of the lifting appliance is connected with the first carrying pole beam, the second carrying pole beam and the adjustable supporting rod, and the temporary supporting base is installed on a pier. The three-dimensional installation deviation rectifying trolley and the bridge pier are fixedly supported, and the position of the box girder is adjusted; the method comprises the steps of erecting a temporary supporting seat on the pier top; predicting a job window in the future 72 hours; the floating crane lifts the lifting appliance; the box girder is placed on the temporary supporting seat; the box girder is subjected to millimeter-level accurate positioning through a jack and a three-dimensional installation deviation rectifying trolley; and mounting the permanent support. By means of the scheme, after the box girder is hoisted, the position of the box girder is accurately adjusted, the accumulated influence of pier body unbalance loading displacement and manufacturing and installation errors on the finished bridge line shape is eliminated, and the millimeter-level installation precision of the multi-span fixed support continuous beam is ensured.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction technology, and in particular to a device and construction method for erecting large-span, narrow-width precast box girders in complex environments. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges. The main body is composed of a top plate, bottom plate, web plate, and transverse and longitudinal diaphragms, all constructed through a fully welded process. The top plate often adopts an orthotropic bridge deck design with longitudinal stiffening ribs, which has the characteristics of strong bending and torsional resistance.

[0003] In the construction of traditional long-span steel box girder bridges, especially in complex aquatic environments, the construction methods of whole-span hoisting by floating cranes or segmented assembly by bridge deck cranes are usually adopted.

[0004] For bridges using single-span piers, the pier cap beams will be under severe eccentric loading during the segmented erection of steel box girders. This can easily lead to cracks in the concrete structure, directly affecting the structural durability and safety. In addition, intermediate piers of multi-span continuous beam bridges are often equipped with fixed supports. The longitudinal displacement caused by eccentric loading of the pier body during steel beam installation, as well as manufacturing and installation errors, make it extremely difficult to control the alignment of the completed bridge. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a device and construction method for erecting large-span, narrow-width precast box girders in complex environments. After hoisting the box girder, its position can be precisely adjusted, eliminating the cumulative impact of factors such as pier eccentric load displacement and manufacturing and installation errors on the bridge alignment, and ensuring millimeter-level installation accuracy for multi-span fixed-support continuous beams.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this application provides a device for erecting large-span, narrow-width precast box girders in complex environments, including a lifting device, an adjustable strut, a temporary support base, and a three-dimensional installation and correction trolley. The lifting device is positioned on the water surface, and the lower end of the lifting end of the lifting device is connected to a first spreader beam, a second spreader beam, and the adjustable strut. The first and second spreader beams are located at opposite ends of the adjustable strut, and when the adjustable strut adjusts its length, it controls the first and second spreader beams to move closer to or further away from each other, so that the first and second spreader beams are respectively connected to the lifting rings at both ends of the top surface of the box girder. The temporary support base is installed on the pier and provides temporary support for the box girder. The three-dimensional installation and correction trolley moves from the upper side of the box girder to above the pier and is fixedly supported by the pier. The three-dimensional installation and correction trolley adjusts the position of the box girder.

[0009] Preferably, the lifting device includes a floating crane, a first lifting rope, a second lifting rope, and a cable; the floating crane is positioned on the water surface and can be anchored and moved; the top of the boom of the floating crane has two lifting points spaced apart, and the two lifting points respectively suspend the two ends of the first and second spreader beams; two first lifting ropes are connected to each lifting point; a first connecting frame is connected to the end of each first lifting rope away from the lifting point, and a second lifting rope is connected to the lower end of the first connecting frame; the two ends of the cable are fixedly connected to the two first connecting frames; a second connecting frame is connected to the lower end of each second lifting rope, and the adjustable support rod is installed between the two second connecting frames; the same end of the first and second spreader beams is suspended below the two second connecting frames respectively.

[0010] Preferably, the adjustable strut includes a support frame, an adjustment unit, and a stress-strain sensor. The support frame includes multiple horizontally arranged support units, which are detachably and fixedly connected end-to-end. A stress-strain sensor is fixedly installed on each support unit to monitor the force on each support unit. The adjustment unit is located at both ends of the support frame along its length, and the end of the adjustment unit away from the support frame is detachably and fixedly connected to the vertical side of the second connecting frame.

[0011] Preferably, the support unit includes a vertical plate and a horizontal plate. Two vertical plates are arranged parallel to each other at intervals, and a horizontal plate is fixedly connected between the two vertical plates. Two horizontal plates are arranged at intervals along the vertical direction, and a V-shaped reinforcing plate is arranged between the two horizontal plates. The vertical plates of two adjacent support units are detachably fixedly connected by bolts. Stress and strain sensors are fixed on the opposite sides of the horizontal plates.

[0012] Preferably, the adjustment unit includes a first adjustment plate, a second adjustment plate, and a telescopic adjustment member; both the first and second adjustment plates are vertically arranged, the first adjustment plate is detachably and fixedly connected to the end of the support frame, a mounting frame is fixedly arranged on the side of the second adjustment plate away from the first adjustment plate, and is fixedly connected to the second connecting frame through the mounting frame; the telescopic adjustment member is installed between the first and second adjustment plates, and multiple telescopic adjustment members are arranged between the first and second adjustment plates.

[0013] Preferably, a support base plate is provided at the upper end of the pier, and a permanent support is cast on the support base plate. The temporary support is installed around the support base plate. The temporary support includes a steel plate, a rubber pad, and jacks. Two sets of steel plates are arranged at intervals on the parallel sides of the support base plate, and multiple steel plates are stacked vertically. The rubber pad is provided on the upper side of the steel plates. Two jacks are provided and located on the two sides of the support base plate away from the steel plates.

[0014] Preferably, the three-dimensional installation and correction trolley includes a middle body, with end bodies respectively provided at both ends of the middle body; a first telescopic member is provided between the middle body and the end bodies; a lifting support assembly is provided on the lower side of the middle body, and a support roller is rotatably provided on the lower side of the end bodies; a fixing device for abutting and fixing to the bridge pier and a lateral adjustment device for abutting to the two vertical sides of the box girder along its length are provided at the ends of the two end bodies that are far apart from each other; a longitudinal adjustment device is provided on the vertical sidewall of the two end bodies parallel to the telescopic direction of the first telescopic member, and the longitudinal adjustment device abuts to the end of the box girder along its length.

[0015] Preferably, the lifting support assembly is provided in multiple sets at intervals, each set including a second telescopic member and a foot support plate; the second telescopic member is fixedly installed on the intermediate vehicle body, the telescopic end of the second telescopic member extends and retracts in the vertical direction, and is fixedly connected to the foot support plate; when the second telescopic member extends, the height of the foot support plate can be lower than the support roller.

[0016] Preferably, mounting cavities are provided at both ends of the vehicle body that are relatively far apart, and a drive block is slidably disposed within the mounting cavity; a driver is provided inside the end vehicle body to control the drive block to move outward or inward along the mounting cavity; the fixing device includes an end platform, a third telescopic member, a first end outer platform, a fourth telescopic member, a fixing plate, and a first laser rangefinder; the end platform is fixedly mounted on the drive block, and the third telescopic member is fixedly connected below the end platform. The third telescopic member moves vertically, and the first end outer platform is fixedly connected to the moving end of the third telescopic member; a first sector-shaped groove is provided on the first end outer platform and on its vertical side near the middle vehicle body, and a first rotating shaft is rotatably connected to the first end outer platform, passing through the first sector-shaped groove; one end of the fourth telescopic member is located in the first sector-shaped groove and is fixedly connected to the first rotating shaft, and the telescopic end of the fourth telescopic member protrudes from the first sector-shaped groove and is fixedly connected to the fixing plate; the fourth telescopic member controls... The fixed plate moves; the first laser rangefinder is installed on the upper side of the first end platform and is used to measure the horizontal distance between the same pier; the lateral adjustment device includes a fifth telescopic member, a second end platform, a sixth telescopic member, a lateral adjustment plate, and a second laser rangefinder; the upper end of the fifth telescopic member is fixedly connected to the lower part of the end platform, the fifth telescopic member moves up and down in the vertical direction, the telescopic end of the fifth telescopic member is fixedly connected to the second end platform, a second sector-shaped groove is opened on the vertical side of the second end platform near the middle vehicle body, a second rotating shaft is opened on the second end platform and passes through the second sector-shaped groove, one end of the sixth telescopic member is located in the sector-shaped groove and is fixedly connected to the second rotating shaft, the telescopic end of the sixth telescopic member passes through the second sector-shaped groove and is fixedly connected to the lateral adjustment plate, the sixth telescopic member controls the movement of the lateral adjustment plate; the second laser rangefinder is installed on the upper side of the second end platform and is used to measure the distance between the same box girder.

[0017] Preferably, the longitudinal adjustment device includes a side platform, a seventh telescopic member, a side outer platform, an eighth telescopic member, a longitudinal adjustment disc, and a third laser rangefinder. The side platform is fixed to the vertical side wall of the end vehicle body parallel to the telescopic direction of the first telescopic member. The seventh telescopic member is fixedly connected to the bottom of the side platform. The seventh telescopic member extends and retracts in the vertical direction, and its telescopic end is fixedly connected to the side outer platform. A third sector-shaped groove is formed on the side outer platform on the vertical side near the center of the end vehicle body. A third rotating shaft is rotatably connected to the side outer platform, passing through the third sector-shaped groove. One end of the eighth telescopic member is located in the third sector-shaped groove and is fixedly connected to the third rotating shaft. The telescopic end of the eighth telescopic member protrudes from the third sector-shaped groove and is fixedly connected to the longitudinal adjustment disc. The third laser rangefinder is fixedly installed on the upper side of the side outer platform and is used to measure the distance between the same box girder.

[0018] To achieve the above objectives, this application provides a method for erecting large-span, narrow-width precast box girders in complex environments, using a device for erecting large-span, narrow-width precast box girders in complex environments, including the following steps:

[0019] Step 1: Precisely erect temporary support seats on the support pad stones at the top of the bridge piers, and complete the entry and inspection of the floating crane, transport ship, and temporary wind measurement tower.

[0020] Step 2: Install GNSS-RTK base station, anemometer, inclinometer and fourth laser rangefinder at the bridge site and surrounding area, and simultaneously predict wind and waves to predict the next 72-hour operation window;

[0021] Step 3: The floating crane enters the designated bridge span and is precisely positioned by using a combination of inter-span anchoring and anchor ropes passing under the trestle; the precast steel box girder on the beam transport vessel arrives at the position to be erected.

[0022] Step 4: Use the floating crane to lift the lifting equipment and ensure a reliable connection between the first and second spreader beams and the lifting rings of the box girder; lift the box girder smoothly and in stages from the transport ship;

[0023] Step 5: The floating crane moves forward and returns to its original position, and the transport ship leaves the work area; the floating crane is manipulated to initially lower the box girder onto the temporary support seat on top of the pier, and the temporary support seat bears the entire load of the girder;

[0024] Step Six: Activate the jacks placed on top of the bridge piers to lift the box girder off the rubber pads; use the jacks and the three-dimensional installation and correction trolley to accurately position the box girder in millimeters in terms of plane position, elevation, and inclination angle;

[0025] Step 7: After the box girder is finely adjusted to meet the standards, the permanent supports are accurately aligned and installed; high-strength grout is injected into the base plate of the supports, and after the strength is formed, the jacks are lowered simultaneously to complete the smooth transfer of the beam load from the temporary support to the permanent support.

[0026] Step 8: The entire process is monitored and verified in real time through an intelligent monitoring platform, which provides feedback and verification on structural stress, ship position, beam attitude, and environmental parameters. Once all indicators are confirmed to meet the design requirements, the single-span box girder erection is completed.

[0027] Preferably, in step two, the step of predicting wind and waves includes setting up an intelligent wind and wave prediction module. The wind and wave prediction module is responsible for data collection by the anemometer and wirelessly transmits the data to the cloud-based intelligent monitoring platform. The anemometer is set on the temporary wind measuring tower, and a solar panel that powers the anemometer is installed on the top of the temporary wind measuring tower. A mapping relationship between the measured data at the bridge site and the offshore forecast is established through three methods: neural network, statistical transfer coefficient, and modified neural network. Historical data is divided into monthly training according to monsoon / non-monsoon seasons. Based on the historical data and the neural network model, the operation window for the next 72 hours is predicted.

[0028] Preferably, in step two, the GNSS-RTK reference station positioning system sets up measuring points on the axis of the floating crane to monitor the ship's position. The lifting equipment has built-in GNSS-RTK measuring points to monitor the real-time position of the hook and steel box girder during the lifting process. The cloud-based intelligent monitoring platform is fixed on the shore. The fourth laser rangefinder and high-definition camera are installed on the top of the floating crane, and the inclinometer is located on the deck of the floating crane.

[0029] (III) Beneficial Effects

[0030] This invention provides a device and construction method for erecting large-span, narrow-width precast box girders in complex environments, which has the following beneficial effects:

[0031] 1) This invention achieves intelligent and safe controllable erection process: By integrating multi-source sensors such as GNSS-RTK, inclinometers, strain gauges, and intelligent video, and constructing a wind and wave prediction model and intelligent monitoring platform based on neural networks, it realizes real-time monitoring and prediction of the entire process, including the aquatic environment, ship status, lifting equipment stress, and beam attitude. This effectively overcomes the shortcomings of traditional methods, such as excessive reliance on experience and high safety risks in complex aquatic environments, providing a scientific basis for lifting decisions and significantly improving construction safety and reliability.

[0032] 2) This invention significantly improves the economy and adaptability of large lifting equipment: By reusing and intelligently upgrading existing large lifting equipment, and adopting a polymer flexible lifting rope and modular support structure, the weight of the lifting equipment is greatly reduced while ensuring load-bearing capacity, thus reducing equipment investment. At the same time, the flexible lifting rope, combined with intelligent monitoring, facilitates operation and inspection and can perceive the stress state in real time, achieving a balance between safety and economy.

[0033] 3) This invention uses a three-dimensional installation and correction trolley to overcome the problem of precise control of the alignment of multi-span continuous beams under complex constraints: by taking comprehensive measures such as secondary correction of beam length, optimization of jack arrangement, implementation of multiple beam adjustments and delayed grouting of supports by one hole, the cumulative influence of factors such as temperature deformation, pier body off-center load displacement, and manufacturing and installation errors on the alignment of the completed bridge is systematically eliminated, ensuring the millimeter-level installation accuracy of multi-span fixed support continuous beams.

[0034] 4) This invention significantly improves the overall construction efficiency in shallow waters: Through integrated construction organization including precise dredging of temporary channels, staggered anchoring of vessels, and tidal coordinated operations, it effectively solves the positioning problem of large vessels in shallow waters and broadens the operational window. Combined with intelligent hoisting and efficient positioning technology, it forms a standardized assembly line operation, significantly shortening the construction period. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall segmented hoisting of a large-span, narrow-width precast box girder erection device for complex environments according to the present invention;

[0036] Figure 2 This is a schematic diagram highlighting the positional relationship between the adjustable support rod and the first and second spreader beams of the present invention;

[0037] Figure 3 To highlight the present invention Figure 2 Enlarged view of the A-structure in the middle;

[0038] Figure 4 To highlight the present invention Figure 2 Enlarged view of the B-structure;

[0039] Figure 5 This is a schematic diagram of the temporary support seat on the bridge pier of the present invention;

[0040] Figure 6 This is a top view highlighting the temporary support base of the present invention;

[0041] Figure 7 This is a schematic diagram of the three-dimensional correction vehicle of the present invention. Figure 1 ;

[0042] Figure 8 To highlight the three-dimensional correction vehicle of this invention Figure 2 ;

[0043] Figure 9 A cross-sectional view highlighting the first sector groove of the present invention;

[0044] Figure 10 This is a schematic diagram illustrating the working mode of the three-dimensional correction trolley in this invention;

[0045] Figure 11 The flowchart highlights the construction method of this invention.

[0046] Marked in the attached diagram:

[0047] 100. Lifting equipment; 110. First spreader beam; 120. Second spreader beam; 130. Floating crane; 131. Fourth laser rangefinder; 132. High-definition camera; 133. Inclinometer; 140. First lifting rope; 150. Second lifting rope; 160. Cable; 170. First connecting frame; 180. Second connecting frame; 200. Adjustable strut; 210. Support frame; 211. Vertical plate; 212. Horizontal plate; 213. Reinforcing plate; 214. Bolt; 220, Adjustment unit; 221, First adjustment plate; 222, Second adjustment plate; 223, Telescopic adjustment component; 230, Stress and strain sensor; 240, Mounting bracket; 300, Temporary support; 310, Steel plate; 320, Rubber pad; 330, Jack; 400, Three-dimensional installation and correction trolley; 410, Intermediate car body; 411, First telescopic component; 420, End car body; 421, Mounting cavity; 422, Drive block; 430, Lifting... Lowering support assembly; 431, second telescopic component; 432, foot support plate; 440, support roller; 450, fixing device; 451, end platform; 452, third telescopic component; 453, first end outer platform; 4531, first sector groove; 4532, first rotating shaft; 454, fourth telescopic component; 455, fixed plate; 456, first laser rangefinder; 460, lateral adjustment device; 461, fifth telescopic component; 462, second end outer platform; 46 21. Second pivot; 463. Sixth telescopic component; 464. Lateral adjustment disc; 465. Second laser rangefinder; 470. Longitudinal adjustment device; 471. Side platform; 472. Seventh telescopic component; 473. Side outer platform; 4731. Third pivot; 474. Eighth telescopic component; 475. Longitudinal adjustment disc; 476. Third laser rangefinder; 500. Support base plate; 600. Temporary wind measuring tower; 610. Anemometer; 620. Solar panel. Detailed Implementation

[0048] The technical solutions of 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] First Embodiment

[0050] This invention provides a device for erecting large-span, narrow-width precast box girders in complex environments. (See attached image) Figures 1 to 4 The system includes a lifting device 100, adjustable struts 200, temporary support seats 300, and a three-dimensional installation and correction trolley 400. During operation, the temporary support seats 300 are installed on the upper side of the pier. The box girder is then hoisted using the lifting device 100 and adjustable struts 200 and placed on the temporary support seats 300. The three-dimensional installation and correction trolley 400 is used to fine-tune the position of the box girder. After fine-tuning, permanent supports are poured on the upper part of the pier, completing the single-span box girder erection operation.

[0051] Specifically, the lifting device 100 is positioned on the water surface, and the lower end of the lifting end of the lifting device 100 is connected to a first spreader beam 110, a second spreader beam 120, and an adjustable support rod 200. The first spreader beam 110 and the second spreader beam 120 are located at both ends of the adjustable support rod 200, and when the length value is adjusted, the adjustable support rod 200 controls the first spreader beam 110 and the second spreader beam 120 to move closer to or further away from each other, so that the first spreader beam 110 and the second spreader beam 120 are respectively connected to the lifting rings at both ends of the top surface of the box girder. During construction, the distance between the first spreader beam 110 and the second spreader beam 120 is adjusted by the adjustable support rod 200, thereby enabling the first spreader beam 110 and the second spreader beam 120 to adjust their distance and lift box girders of different sizes.

[0052] The lifting device 100 includes a floating crane 130, a first lifting rope 140, a second lifting rope 150, and a cable 160.

[0053] The floating crane 130 is set on the water surface and can be anchored and moved. The top of the boom of the floating crane 130 is provided with two lifting points at intervals. The two lifting points respectively lift the two ends of the first spreader beam 110 and the second spreader beam 120.

[0054] Each lifting point is connected to two first lifting ropes 140. At the end of each first lifting rope 140 furthest from the lifting point, a first connecting frame 170 is connected. A second lifting rope 150 is connected to the lower end of the first connecting frame 170. The two ends of a cable 160 are fixedly connected to the two first connecting frames 170. The two first connecting frames 170 are connected and fixed by the cable 160, thereby keeping the distance between the two first lifting ropes 140 and the lifting point relatively stable.

[0055] A second connecting frame 180 is connected to the lower end of each second lifting rope 150, and an adjustable support rod 200 is installed between the two second connecting frames 180. The same end of the first spreader beam 110 and the second spreader beam 120 are respectively hoisted below the two second connecting frames 180. Finally, the two ends of the first spreader beam 110 and the second spreader beam 120 are hoisted through two lifting points.

[0056] The adjustable strut 200 controls the distance between the two second connecting frames 180, thereby enabling the adjustment of the distance between the first flat beam 110 and the second flat beam 120.

[0057] The adjustable strut 200 includes a support frame 210, an adjustment unit 220, and a stress-strain sensor 230.

[0058] The support frame 210 includes multiple horizontally arranged support units, which are detachably and fixedly connected end to end. During installation, the dimensions of the box girder are measured, and after connecting multiple support units end to end, the length of the support frame 210 is made close to the dimensions of the box girder.

[0059] A stress-strain sensor 230 is fixedly installed on each support unit to monitor the force on each support unit. Therefore, during the hoisting process, the strain sensor monitors the force acting on each support unit in real time.

[0060] Specifically, the support unit includes a vertical plate 211 and a horizontal plate 212. Two vertical plates 211 are arranged parallel to each other at intervals. A horizontal plate 212 is fixedly connected between the two vertical plates 211. Two horizontal plates 212 are arranged at intervals along the vertical direction. A V-shaped reinforcing plate 213 is arranged between the two horizontal plates 212. The vertical plates 211 of two adjacent support units are detachably fixedly connected by bolts 214. Stress and strain sensors 230 are fixed on the opposite sides of the horizontal plates 212.

[0061] Adjustment units 220 are located at both ends of the support frame 210 along its length. The end of the adjustment unit 220 away from the support frame 210 is detachably and fixedly connected to the vertical side of the second connecting frame 180. During assembly, after the support frame 210 is assembled, its length is made close to the size of the box girder. By adjusting the adjustment unit 220, the length of the adjustable strut 200 is finely adjusted, thereby changing the distance between the two ends of the second connecting frame 180, and thus adjusting the distance between the first spreader beam 110 and the second spreader beam 120, ultimately completing the connection with the box girder.

[0062] Specifically, the adjustment unit 220 includes a first adjustment plate 221, a second adjustment plate 222, and a telescopic adjustment member 223. The telescopic adjustment member 223 can be a hydraulic cylinder.

[0063] Both the first adjusting plate 221 and the second adjusting plate 222 are vertically arranged. The first adjusting plate 221 is detachably and fixedly connected to the end of the support frame 210. A mounting bracket 240 is fixedly arranged on the side of the second adjusting plate 222 away from the first adjusting plate 221, and is fixedly connected to the second connecting frame 180 through the mounting bracket 240. Telescopic adjusting members 223 are installed between the first adjusting plate 221 and the second adjusting plate 222, and multiple telescopic adjusting members 223 are arranged between the first adjusting plate 221 and the second adjusting plate 222.

[0064] In a preferred embodiment, a first telescopic rod is further provided between the first adjusting plate 221 and the second adjusting plate 222. One end of the first telescopic rod is fixed to the first adjusting plate 221, and the other end of the first telescopic rod is fixed to the second adjusting plate 222. The first telescopic rod can serve as an auxiliary force-bearing mechanism.

[0065] In use, the adjustment distance of the adjustment unit 220 is less than the length of a support unit, enabling fine-tuning of the length of the adjustable strut 200. When the required adjustment distance is greater than the length of a support unit, an additional support unit can be added to achieve the adjustment. Furthermore, in practical applications, the number of support units can be flexibly increased or decreased according to the dimensions of each box girder segment, while simultaneously controlling the adjustment unit 220 to ensure that the first spreader beam 110 and the second spreader beam 120 can be connected to each box girder.

[0066] See Figures 5 to 6 The temporary support seat 300 is installed on the bridge pier and provides temporary support for the box girder. During construction, the box girder is first placed on the temporary support seat 300 and then its position is finely adjusted.

[0067] Specifically, a support base plate 500 is provided at the upper end of the pier, and a permanent support is cast on the support base plate 500. It can be understood that the permanent support of the present application is formed by casting after the position of the fine-tuning box girder is adjusted. By providing the temporary support base 300, the box girder can be temporarily supported, and at the same time, the position adjustment is convenient.

[0068] The temporary support base 300 is installed around the support base plate 500; the temporary support base 300 includes a steel plate 310, a rubber pad 320 and a jack 330.

[0069] Two groups of steel plates 310 are arranged at intervals on both sides parallel to the permanent support, and multiple steel plates 310 are stacked vertically. A rubber pad 320 is arranged on the upper side of the steel plate 310. Two jacks 330 are provided and are located on the two sides of the permanent support away from the steel plate 310. During the hoisting construction, the box girder is first placed on the rubber pad 320 above the steel plate 310. Stable and reliable temporary support points are provided for the box girder through the steel plate 310 and the rubber pad 320, and the box girder is buffer-protected through the rubber pad 320 to avoid damage to the cap beam. At the same time, through the provided steel plate 310 and rubber pad 320, the box girder layer can be prevented from impacting the permanent support. Through the provided jacks 330, the precise adjustment of the height of the box girder can be achieved in cooperation with the three-dimensional installation deviation correction trolley 400.

[0070] See Figures 7 to 10 , the three-dimensional installation deviation correction trolley 400 moves from the upper side of the box girder to above the pier and is fixedly supported with the pier, and the three-dimensional installation deviation correction trolley 400 adjusts the position of the box girder.

[0071] Specifically, the three-dimensional installation deviation correction trolley 400 includes an intermediate car body 410, and end car bodies 420 are respectively arranged at both ends of the intermediate car body 410; first telescopic members 411 are arranged between the intermediate car body 410 and the end car bodies 420. Among them, multiple groups of first telescopic members 411 are arranged at intervals. During operation, the distance between the intermediate car body 410 and the end car bodies 420 is adjusted by the extension or shortening of the first telescopic members 411. Specifically, the first telescopic member 411 can be a hydraulic cylinder structure or other telescopic structures, which is not limited here. By providing the first telescopic members 411, the connection between the end car bodies 420 and the intermediate car body 410 can be realized. At the same time, the relative movement of the end car bodies 420 with respect to the intermediate car body 410 can be controlled. Finally, the support of the end car bodies 420 on the intermediate car body 410 can be realized through the first telescopic members 411.

[0072] A lifting support assembly 430 is provided on the lower side of the intermediate car body 410, and a support roller 440 is rotatably mounted on the lower side of the end car body 420. A drive structure is provided inside the end car body 420, which controls the rotation of the support roller 440, thereby controlling the movement of the end car body 420 and the intermediate car body 410 above the box girder. Specifically, the drive structure includes a drive motor, which drives the support roller 440 to rotate. The drive motor and the support roller 440 can be connected by a belt, chain, or gear, which is not limited here.

[0073] The lifting support assembly 430 is provided in multiple sets at intervals, each set including a second telescopic member 431 and a foot support plate 432. The second telescopic member 431 is fixedly installed on the intermediate vehicle body 410, and the telescopic end of the second telescopic member 431 extends and retracts in the vertical direction and is fixedly connected to the foot support plate 432. When the second telescopic member 431 is extended, the height of the foot support plate 432 can be lower than the support roller 440. The second telescopic member 431 can be a hydraulic cylinder or other controllable telescopic member, which is not limited to any specific type.

[0074] With the lifting support assembly 430 in place, when the vehicle body moves, the lifting support assembly 430 can detach from the box beam below. At the same time, when it moves to a suitable position, the lifting support assembly 430 can abut against the box beam below, so that the middle vehicle body 410 and the end vehicle body 420 are lifted off the ground, thereby facilitating the control of the movement of the end vehicle body 420 relative to the middle vehicle body 410.

[0075] At the two ends of the vehicle body 420 that are far apart from each other, there is a fixing device 450 that abuts against the bridge pier and a lateral adjustment device 460 that abuts against the two vertical sides along the length of the box girder. In use, by adjusting the position of the end vehicle body 420, the fixing device 450 can be lowered from both sides along the length of the box girder and abut against the bridge pier below. After fixing, the position of the box girder is adjusted using the lateral adjustment device 460.

[0076] A longitudinal adjustment device 470 is provided on the vertical sidewall of the two end bodies 420 parallel to the telescopic direction of the first telescopic member 411. The longitudinal adjustment device 470 abuts against the end of the box girder in the length direction. During operation, the longitudinal position of the box girder is adjusted by abutting against the end of the box girder through the longitudinal adjustment device 470.

[0077] Mounting cavities 421 are provided at both ends of the two end bodies 420 that are relatively far apart. A drive block 422 is slidably disposed in the mounting cavity 421. An actuator is provided inside the end body 420 to control the drive block 422 to move outward or inward along the mounting cavity 421. The actuator may be a hydraulic cylinder.

[0078] The fixing device 450 includes an end platform 451, a third telescopic member 452, a first end outer platform 453, a fourth telescopic member 454, a fixing plate 455, and a first laser rangefinder 456.

[0079] The end platform 451 is fixedly mounted on the drive block 422. When the drive block 422 moves, it can drive the end platform 451 to move horizontally and move towards or away from the middle vehicle body 410.

[0080] A third telescopic member 452 is fixedly connected below the end platform 451. Multiple third telescopic members 452 can be provided. The third telescopic members 452 move vertically, and a first end outer platform 453 is fixedly connected to the moving end of the third telescopic member 452. The third telescopic member 452 can be a hydraulic cylinder, capable of both vertical movement and support for the first end outer platform 453. More preferably, a second telescopic rod can be provided between the end platform 451 and the first end outer platform 453. The second telescopic rod extends and retracts vertically, thus providing a horizontal limit. During operation, it assists the third telescopic member 452 in supporting the first end outer platform 453 and also bears load horizontally.

[0081] A first sector-shaped groove 4531 is provided on the first end outer platform 453 and on the vertical side near the middle vehicle body 410. A first rotating shaft 4532 is rotatably connected to the first end outer platform 453, passing through the first sector-shaped groove 4531. One end of the fourth telescopic member 454 is located in the first sector-shaped groove 4531 and is fixedly connected to the first rotating shaft 4532. The telescopic end of the fourth telescopic member 454 protrudes through the first sector-shaped groove 4531 and is fixedly connected to the fixing plate 455. The fourth telescopic member 454 controls the movement of the fixing plate 455. The first sector-shaped groove 4531 is set vertically at a certain angle, so that the fourth telescopic member 454 can only rotate vertically by the set angle. Therefore, when it is fixed to the pier, the fixing plate 455 can adapt to different angles of the pier surface. By cooperating with the fixing devices 450 set at both ends of the two end vehicle bodies 420, the pier can be clamped from both sides. This enables a fixed connection with the bridge pier.

[0082] The first laser rangefinder 456 is installed on the upper side of the first end platform 453 and is used to measure the horizontal distance between the same pier.

[0083] Multiple lateral adjustment devices 460 are provided, and each lateral adjustment device 460 includes a fifth telescopic member 461, a second end platform 462, a sixth telescopic member 463, a lateral adjustment disk 464, and a second laser rangefinder 465.

[0084] The upper end of the fifth telescopic member 461 is fixedly connected to the lower part of the end platform 451. The fifth telescopic member 461 moves up and down in the vertical direction. The second end outer platform 462 is fixedly connected to the telescopic end of the fifth telescopic member 461, that is, the fifth telescopic member 461 is located between the end platform 451 and the second end outer platform 462. The fifth telescopic member 461 can be a hydraulic cylinder, which can move up and down in the vertical direction and at the same time support the first end outer platform 453.

[0085] Even better, a third telescopic rod can be provided between the end platform 451 and the second end outer platform 462. The third telescopic rod extends and retracts in the vertical direction, thereby serving as a limit in the horizontal direction. During operation, it can assist the fifth telescopic member 461 in supporting the second end outer platform 462, and at the same time, it serves as a load-bearing member in the horizontal direction.

[0086] A second sector-shaped groove is provided on the second end outer platform 462 and on the vertical side near the middle vehicle body 410. A second rotating shaft 4621 is provided on the second end outer platform 462 and passes through the second sector-shaped groove. One end of the sixth telescopic member 463 is located in the sector-shaped groove and is fixedly connected to the second rotating shaft 4621. The telescopic end of the sixth telescopic member 463 passes through the second sector-shaped groove and is fixedly connected to the transverse adjustment plate 464. The sixth telescopic member 463 controls the movement of the transverse adjustment plate 464.

[0087] The second sector-shaped groove is set vertically at a certain angle, allowing the sixth expansion joint 463 to rotate only vertically by the set angle. Therefore, when it abuts against the box girder, the adjusting disc can adapt to different angles on the box girder surface. After the fixing device 450 is fixed to the pier, the position of the box girder can be adjusted when the sixth expansion joint 463 extends.

[0088] The second laser rangefinder 465 is installed on the upper side of the second end platform 462 and is used to measure the distance between the box girders. During operation, the position of the box girder relative to the pier is determined by the distance values ​​measured by the first laser rangefinder 456 and the second laser rangefinder 465, as well as the distance between the first laser rangefinder 456 and the second laser rangefinder 465, thereby facilitating the determination and adjustment of the box girder's position.

[0089] The longitudinal adjustment device 470 includes a side platform 471, a seventh telescopic component 472, a side outer platform 473, an eighth telescopic component 474, a longitudinal adjustment disc 475, and a third laser rangefinder 476.

[0090] The side platform 471 is fixed to the vertical side wall of the end body 420 parallel to the telescopic direction of the first telescopic member 411. A seventh telescopic member 472 is fixedly connected to the bottom of the side platform 471. The seventh telescopic member 472 extends and retracts vertically, and its telescopic end is fixedly connected to a side outer platform 473. The seventh telescopic member 472 can be a hydraulic cylinder, which can both rise and fall vertically and support the first end outer platform 453. More preferably, a fourth telescopic rod can be provided between the side platform 471 and the side outer platform 473. The fourth telescopic rod extends and retracts vertically, thus serving as a horizontal limiter. During operation, it can assist the seventh telescopic member 472 in supporting the side outer platform 473 and simultaneously bear force horizontally.

[0091] A third sector-shaped groove is provided on the side outer platform 473 and on the vertical side near the center of the end body 420. A third rotating shaft 4731 is rotatably connected to the side outer platform 473. The third rotating shaft 4731 passes through the third sector-shaped groove. One end of the eighth telescopic member 474 is located in the third sector-shaped groove and is fixedly connected to the third rotating shaft 4731. The telescopic end of the eighth telescopic member 474 protrudes through the third sector-shaped groove and is fixedly connected to the longitudinal adjustment disc 475.

[0092] The third sector-shaped groove is set vertically at a certain angle, allowing the eighth expansion joint 474 to rotate only vertically by the set angle. Therefore, when it abuts against the box girder, the adjusting disc can adapt to different angles on the box girder surface. After the fixing device 450 is fixed to the pier, the position of the box girder can be adjusted when the eighth expansion joint 474 extends.

[0093] The third laser rangefinder 476 is fixedly installed on the upper side of the side platform 473 and is used to measure the distance between the same box girder.

[0094] When the three-dimensional installation and correction trolley 400 is in operation, it first moves along the upper side of the box girder and stops when it reaches the appropriate position. The lifting support assembly 430 lowers the trolley so that its lower end abuts against the box girder, and the support rollers 440 disengage from the box girder. Then, the first telescopic member 411 controls the two end trolley bodies 420 to move outwards until they reach the edge of the box girder and stop. Multiple fixing devices 450 then activate; the third telescopic member 452 controls the end platforms to move downwards until they are positioned on both sides of the pier. At this point, the fourth telescopic member 454 controls the fixing plate 455 to press against the pier, thus fixing the trolley body position. After fixing the trolley body position, the lateral adjustment device 460 and the longitudinal adjustment device 470 fine-tune the position of the box girder. Simultaneously, the jacks 330 fine-tune the height of the box girder, ultimately achieving precise adjustment of the box girder and thus precise beam lowering.

[0095] Second Embodiment

[0096] This embodiment provides a construction method for erecting large-span, narrow-width precast box girders in complex environments. (See also...) Figure 11 Using a complex environment large-span narrow-width precast box girder erection device according to the first embodiment, the following steps are included:

[0097] Step one involves precisely erecting a temporary support base 300 on the support pad stone at the top of the bridge pier, and completing the entry and inspection of the floating crane 130, transport ship, and temporary wind measurement tower 600. The elevation error of the top surface of the temporary support base 300 is controlled within ±2mm.

[0098] Step 2: Install a GNSS-RTK base station, an anemometer 610, an inclinometer 133, and a fourth laser rangefinder 131 at the bridge site and surrounding area to simultaneously predict wind and waves and forecast the operation window for the next 72 hours.

[0099] Step 3: The floating crane 130 enters the designated bridge span and is precisely positioned by using a combination of inter-span anchoring and anchor ropes passing under the trestle bridge; the precast steel box girder on the beam transport vessel arrives at the position to be erected.

[0100] Step four: The floating crane 130 lifts the lifting device 100 and ensures that the first spreader beam 110 and the second spreader beam 120 are reliably connected to the lifting rings of the box girder; the box girder is then lifted and detached from the transport ship in stages and smoothly.

[0101] The front anchor rope passes under the trestle bridge. The beam transport vessel enters at high tide (nine-tenths of the way up) and anchors across the current on the downstream side of the span of the floating crane 130. The floating crane 130 moves laterally towards the beam transport vessel by using a winch anchor, and lifts the beam in stages using high-polymer flexible lifting ropes, namely the first lifting rope 140 and the second lifting rope 150. During the lifting process, the GNSS-RTK measuring point laser rangefinder built into the lifting device 100 transmits the spatial position of the beam in real time, sensors monitor the stress on the lifting slings, and the high-definition camera 132 records the entire process and transmits the images to the cloud. The inclinometer 133 monitors the inclinometer angle of the lifting device 100 at all times.

[0102] Step 5: The floating crane 130 moves forward and returns to its original position, and the transport vessel withdraws from the work area. The floating crane 130 is then manipulated to initially lower the box girder onto the temporary support 300 atop the pier. The temporary support 300 bears the entire load of the girder. In this step, the floating crane 130 moves the vessel to the erection position and simultaneously lowers the steel box girder to a height of 30cm from the temporary support 300. The centerline of the temporary support 300 is initially aligned with the markings on the bottom of the girder. After controlling the deviation within 5cm, the girder continues to be lowered so that the temporary support 300 bears the full load.

[0103] Step 6: Activate the jacks 330 positioned on top of the bridge piers to lift the box girder off the rubber pads 320; use the jacks 330 and the three-dimensional installation and correction trolley 400 to perform millimeter-level precise positioning of the box girder's plane position, elevation, and inclination angle.

[0104] The 330mm jack on the pier top was activated to lift the beam off the temporary support 300mm. A 400mm three-dimensional installation and correction trolley was used for horizontal fine-tuning, and the vertical elevation of the beam was controlled by raising and lowering the 330mm jack. After fine-tuning, the beam's axis deviation was ≤2mm, and the elevation deviation was ≤1mm.

[0105] Step 7: After the box girder is finely adjusted to meet the standards, complete the alignment of the permanent supports during a period of stable temperature. Accurately align and install the permanent supports; inject high-strength grout into the support base plate 500; after the grout has strengthened, the jacks 330 will simultaneously drop back down, completing the smooth transfer of the beam load from the temporary support 300 to the permanent support.

[0106] Step 8: The entire process is monitored and verified in real time through an intelligent monitoring platform, including structural stress, ship position, beam attitude, and environmental parameters. Once all indicators are confirmed to meet the design requirements, the single-span box girder erection is completed.

[0107] Specifically, the intelligent monitoring platform integrates real-time data from wind and waves, inclinometer 133, stress and strain sensor 230, and GNSS-RTK: it alarms and shuts down when the wind speed exceeds the limit; it automatically adjusts the hook when the 100° tilt angle of the lifting device is abnormal; it keeps the tensile stress of the cap beam within 4MPa throughout the entire process; and it ensures that the plane error of the beam after placement is <3mm, allowing the bridge to be completed in one go.

[0108] Step nine: After the right-side box girder is erected, the left-side box girder is erected following the same process. Once both girder sections are in place, the transverse connecting boxes are installed. Grouting of the supports is delayed by one span to eliminate accumulated errors. Through this process, millimeter-level precision intelligent erection of large-span, narrow-box girders is achieved.

[0109] Specifically, in step two, the process of predicting wind and waves includes setting up an intelligent wind and wave prediction module. The wind and wave prediction module is responsible for data collection by an anemometer 610 and wireless transmission to a cloud-based intelligent monitoring platform. The anemometer 610 is installed on a temporary wind measurement tower 600, and a solar panel 620 that supplies power to the anemometer 610 is installed on the top of the temporary wind measurement tower 600. Through three methods—neural network, statistical transfer coefficient, and modified neural network—a mapping relationship between the measured data at the bridge site and the offshore forecast is established. Historical data is divided into monsoon / non-monsoon periods and trained monthly. Based on the historical data and the neural network model, the operation window for the next 72 hours is predicted, and the high tide period is determined as the optimal operation period.

[0110] Meanwhile, in step two, the GNSS-RTK base station positioning system sets up measuring points along the axis of the floating crane 130 to monitor the ship's position. The lifting equipment 100 has built-in GNSS-RTK measuring points to monitor the real-time position of the hook and steel box girder during the lifting process. The cloud-based intelligent monitoring platform is fixed on the shore. The fourth laser rangefinder 131 and the high-definition camera 132 are installed on the top of the floating crane 130, and the inclinometer 133 is set on the deck of the floating crane 130.

[0111] This invention provides a device and construction method for erecting large-span, narrow-width precast box girders in complex environments, which has the following beneficial effects:

[0112] 1) This invention achieves intelligent and safe controllable erection process: By integrating multi-source sensors such as GNSS-RTK, inclinometer 133, strain gauges, and intelligent video, and constructing a wind and wave prediction model and intelligent monitoring platform based on neural networks, it realizes real-time monitoring and prediction of the entire process of water environment, ship status, 100% load on lifting equipment, and beam attitude. This effectively overcomes the shortcomings of traditional methods, such as excessive reliance on experience and high safety risks in complex water environments, providing a scientific basis for lifting decisions and significantly improving construction safety and reliability;

[0113] 2) This invention significantly improves the economy and adaptability of the large lifting device 100: By reusing and intelligently upgrading the existing large lifting device 100, and adopting a polymer flexible lifting rope and modular support structure, the self-weight of the lifting device 100 is greatly reduced while ensuring load-bearing capacity, thus reducing equipment investment. At the same time, the flexible lifting rope combined with intelligent monitoring facilitates operation and inspection and can perceive the stress state in real time, achieving a balance between safety and economy.

[0114] 3) This invention uses a three-dimensional installation and correction trolley 400 to overcome the problem of precise control of the alignment of multi-span continuous beams under complex constraints: by taking comprehensive measures such as secondary correction of beam length, optimization of jack 330 arrangement, implementation of multiple beam adjustments and delayed grouting of supports by one hole, the cumulative influence of factors such as temperature deformation, pier body off-center load displacement, manufacturing and installation errors on the alignment of the completed bridge is systematically eliminated, ensuring the millimeter-level installation accuracy of multi-span fixed support continuous beams.

[0115] 4) This invention significantly improves the overall construction efficiency in shallow waters: Through integrated construction organization including precise dredging of temporary channels, staggered anchoring of vessels, and tidal coordinated operations, it effectively solves the positioning problem of large vessels in shallow waters and broadens the operational window. Combined with intelligent hoisting and efficient positioning technology, it forms a standardized assembly line operation, significantly shortening the construction period.

[0116] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0117] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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. Without conflict, the embodiments and features in the embodiments of this invention can be combined with each other.

[0118] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A device for erecting large-span, narrow-width precast box girders in complex environments, characterized in that: Includes a lifting device (100), an adjustable strut (200), a temporary support base (300), and a three-dimensional installation and correction trolley (400); The lifting device (100) is set on the water surface, and the lower end of the lifting end of the lifting device (100) is connected to the first flat beam (110), the second flat beam (120) and the adjustable support rod (200). The first flat beam (110) and the second flat beam (120) are located at both ends of the adjustable support rod (200), and when the adjustable support rod (200) adjusts the length value, it controls the first flat beam (110) and the second flat beam (120) to move closer to each other or further away from each other, so that the first flat beam (110) and the second flat beam (120) are respectively connected to the lifting rings at both ends of the top surface of the box girder; The temporary support (300) is installed on the bridge pier and provides temporary support for the box girder; The three-dimensional installation and correction trolley (400) moves from the upper side of the box girder to the top of the pier and is fixedly supported by the pier. The three-dimensional installation and correction trolley (400) adjusts the position of the box girder.

2. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 1, characterized in that: The lifting device (100) includes a floating crane (130), a first lifting rope (140), a second lifting rope (150), and a cable (160); The floating crane (130) is set on the water surface and can be anchored and moved. The top of the boom of the floating crane (130) is provided with two lifting points at intervals. The two lifting points respectively lift the two ends of the first spreader beam (110) and the second spreader beam (120). Two of the first lifting ropes (140) are connected at each lifting point; Each of the first suspension ropes (140) is connected to a first connecting frame (170) at the end away from the suspension point. A second suspension rope (150) is connected to the lower end of the first connecting frame (170). The two ends of the cable (160) are fixedly connected to the two first connecting frames (170). A second connecting frame (180) is connected to the lower end of each second rope (150), and the adjustable support rod (200) is installed between the two second connecting frames (180). The first spreader beam (110) and the second spreader beam (120) are respectively hoisted to the same end below the two second connecting frames (180).

3. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 2, characterized in that: The adjustable strut (200) includes a support frame (210), an adjustment unit (220), and a stress-strain sensor (230). The support frame (210) includes multiple horizontally arranged support units, and the multiple support units are detachably and fixedly connected end to end; a stress-strain sensor (230) is fixedly installed on each support unit, and the stress-strain sensor (230) monitors the force on each support unit; The adjustment unit (220) is located at both ends of the support frame (210) along its length. The end of the adjustment unit (220) away from the support frame (210) is detachably and fixedly connected to the vertical side of the second connecting frame (180).

4. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 3, characterized in that: The support unit includes a vertical plate (211) and a horizontal plate (212). Two vertical plates (211) are arranged parallel to each other at intervals. The horizontal plate (212) is fixedly connected between the two vertical plates (211). Two horizontal plates (212) are arranged at intervals along the vertical direction. A V-shaped reinforcing plate (213) is arranged between the two horizontal plates (212). The vertical plates (211) of two adjacent support units are detachably fixedly connected by bolts (214). Stress and strain sensors (230) are fixed on the opposite sides of the horizontal plate (212).

5. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 3, characterized in that: The adjustment unit (220) includes a first adjustment plate (221), a second adjustment plate (222), and a telescopic adjustment member (223); The first adjusting plate (221) and the second adjusting plate (222) are both vertically arranged. The first adjusting plate (221) is detachably and fixedly connected to the end of the support frame (210). The second adjusting plate (222) has a mounting bracket (240) fixedly arranged on the side away from the first adjusting plate (221), and is fixedly connected to the second connecting frame (180) through the mounting bracket (240). The telescopic adjustment member (223) is installed between the first adjustment plate (221) and the second adjustment plate (222), and multiple telescopic adjustment members (223) are provided between the first adjustment plate (221) and the second adjustment plate (222).

6. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 1, characterized in that: A bearing base plate (500) is provided at the upper end of the pier, and a permanent bearing is cast on the bearing base plate (500). The temporary support (300) is installed around the bearing base plate (500). The temporary support (300) includes a steel plate (310), a rubber pad (320), and a jack (330). Two sets of steel plates (310) are spaced apart on the parallel sides of the support base plate (500), and multiple steel plates (310) are stacked in the vertical direction. The rubber pad (320) is provided on the upper side of the steel plates (310). Two jacks (330) are provided and are located on the two sides of the support base plate (500) away from the steel plate (310).

7. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 1, characterized in that: The three-dimensional installation and correction trolley (400) includes an intermediate body (410), and end bodies (420) are respectively provided at both ends of the intermediate body (410); a first telescopic member (411) is provided between the intermediate body (410) and the end bodies (420). A lifting support assembly (430) is provided on the lower side of the middle vehicle body (410), and a support roller (440) is rotatably provided on the lower side of the end vehicle body (420). A fixing device (450) that abuts against the pier and a lateral adjustment device (460) that abuts against the two vertical sides of the box girder along its length are provided at the ends of the two end bodies (420) that are far apart from each other. A longitudinal adjustment device (470) is provided on the vertical sidewall of the two end bodies (420) parallel to the telescopic direction of the first telescopic member (411), and the longitudinal adjustment device (470) abuts against the end of the box girder in the length direction.

8. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 7, characterized in that: The lifting support assembly (430) is provided in multiple sets at intervals, each set including a second telescopic member (431) and a foot support plate (432). The second telescopic member (431) is fixedly installed on the intermediate vehicle body (410). The telescopic end of the second telescopic member (431) extends and retracts in the vertical direction and is fixedly connected to the foot support plate (432). When the second telescopic member (431) extends, the height of the foot support plate (432) can be lower than the support roller (440).

9. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 7, characterized in that: Mounting cavities (421) are provided at both ends of the two end bodies (420) that are relatively far apart. A drive block (422) is slidably disposed in the mounting cavity (421). A driver is provided inside the end body (420) to control the drive block (422) to move outward or inward along the mounting cavity (421). The fixing device (450) includes an end platform (451), a third telescopic member (452), a first end outer platform (453), a fourth telescopic member (454), a fixing plate (455), and a first laser rangefinder (456). The end platform (451) is fixedly installed on the drive block (422), and the third telescopic member (452) is fixedly connected below the end platform (451). The third telescopic member (452) moves up and down in the vertical direction, and the first end outer platform (453) is fixedly connected to the moving end of the third telescopic member (452). A first sector-shaped groove (4531) is provided on the first end outer platform (453) and on the vertical side near the middle vehicle body (410). A first rotating shaft (4532) is rotatably connected to the first end outer platform (453). The first rotating shaft (4532) passes through the first sector-shaped groove (4531). One end of the fourth telescopic member (454) is located in the first sector-shaped groove (4531) and is fixedly connected to the first rotating shaft (4532). The telescopic end of the fourth telescopic member (454) passes through the first sector-shaped groove (4531) and is fixedly connected to the fixed plate (455). The fourth telescopic member (454) controls the movement of the fixed plate (455). The first laser rangefinder (456) is installed on the upper side of the first end outer platform (453) and is used to measure the horizontal distance between the same pier. The lateral adjustment device (460) includes a fifth telescopic component (461), a second end platform (462), a sixth telescopic component (463), a lateral adjustment disk (464), and a second laser rangefinder (465). The upper end of the fifth telescopic member (461) is fixedly connected to the lower part of the end platform (451). The fifth telescopic member (461) moves up and down in the vertical direction. The second end outer platform (462) is fixedly connected to the telescopic end of the fifth telescopic member (461). A second sector-shaped groove is provided on the vertical side of the second end outer platform (462) near the middle vehicle body (410). A second rotating shaft (4621) is provided on the second end outer platform (462). 1) Passing through the second sector groove, one end of the sixth telescopic member (463) is located in the sector groove and is fixedly connected to the second rotating shaft (4621). The telescopic end of the sixth telescopic member (463) passes through the second sector groove and is fixedly connected to the transverse adjustment plate (464). The sixth telescopic member (463) controls the movement of the transverse adjustment plate (464). The second laser rangefinder (465) is installed on the upper side of the second end platform (462) and is used to measure the distance between the box beams.

10. The device for erecting large-span, narrow-width precast box girders in complex environments according to claim 7, characterized in that: The longitudinal adjustment device (470) includes a side platform (471), a seventh telescopic component (472), a side outer platform (473), an eighth telescopic component (474), a longitudinal adjustment disk (475), and a third laser rangefinder (476). The side platform (471) is fixed to the vertical side wall of the end body (420) parallel to the telescopic direction of the first telescopic member (411). The seventh telescopic member (472) is fixedly connected to the bottom of the side platform (471). The seventh telescopic member (472) extends and retracts in the vertical direction. The telescopic end of the seventh telescopic member (472) is fixedly connected to a side outer platform (473). A third sector-shaped groove is provided on the side outer platform (473) and on the vertical side near the center of the end body (420). A third rotating shaft (4731) is rotatably connected to the side outer platform (473). The third rotating shaft (4731) passes through the third sector-shaped groove. One end of the eighth telescopic member (474) is located in the third sector-shaped groove and is fixedly connected to the third rotating shaft (4731). The telescopic end of the eighth telescopic member (474) protrudes from the third sector-shaped groove and is fixedly connected to the longitudinal adjustment disc (475). The third laser rangefinder (476) is fixedly installed on the upper side of the side platform (473) and is used to measure the distance between the same box girder.

11. A method for erecting large-span, narrow-width precast box girders in complex environments, characterized in that: Using the complex environment large-span narrow-width precast box girder erection device according to any one of claims 1-10, the following steps are included: Step 1: Precisely erect temporary support bases (300) on the support pad stones at the top of the bridge piers, and complete the entry and inspection of the floating crane (130), transport ship, and temporary wind measurement tower (600). Step 2: Install GNSS-RTK reference station, anemometer (610), inclinometer (133) and fourth laser rangefinder (131) at the bridge site and surrounding area, and simultaneously predict wind and waves to predict the next 72-hour operation window; Step 3: The floating crane (130) enters the designated bridge span and is precisely positioned by using a combination of inter-span anchoring and anchor ropes passing under the trestle bridge; the precast steel box girder on the beam transport vessel arrives at the position to be erected. Step 4: The floating crane (130) lifts the lifting device (100) and controls the reliable connection between the first spreader beam (110) and the second spreader beam (120) and the lifting ring of the box girder; the box girder is lifted off the transport ship in stages and smoothly; Step 5: The floating crane (130) moves forward and returns to its original position, and the transport ship leaves the work area; the floating crane (130) is manipulated to initially lower the box girder onto the temporary support seat (300) on the top of the pier, and the temporary support seat (300) bears the entire load of the girder; Step 6: Activate the jacks (330) placed on top of the piers to lift the box girder off the rubber pads (320); use the jacks (330) and the three-dimensional installation and correction trolley (400) to accurately position the plane position, elevation and inclination of the box girder at the millimeter level; Step 7: After the box girder is finely adjusted to meet the standards, the permanent support is accurately positioned and installed; high-strength grout is injected into the support base plate (500), and after the strength is formed, the jack (330) is simultaneously lowered to complete the smooth transfer of the beam load from the temporary support (300) to the permanent support. Step 8: The entire process is monitored and verified in real time through an intelligent monitoring platform, which provides feedback and verification on structural stress, ship position, beam attitude, and environmental parameters. Once all indicators are confirmed to meet the design requirements, the single-span box girder erection is completed.

12. The construction method for erecting large-span narrow-width precast box girders in complex environments according to claim 11, characterized in that: In step two, the step of predicting wind and waves includes setting up an intelligent wind and wave prediction module. The wind and wave prediction module is responsible for data collection by the anemometer (610) and wireless transmission to the cloud intelligent monitoring platform. The anemometer (610) is installed on the temporary wind measurement tower (600), and a solar panel (620) for powering the anemometer (610) is installed on the top of the temporary wind measurement tower (600). The mapping relationship between the measured data of the bridge site and the offshore forecast is established by three methods: neural network, statistical transfer coefficient and modified neural network. Historical data is divided into months according to monsoon / non-monsoon period. Based on the historical data and neural network model, the operation window for the next 72 hours is predicted.

13. The construction method for erecting large-span, narrow-width precast box girders in complex environments according to claim 12, characterized in that: In step two, the GNSS-RTK base station positioning system sets up measuring points on the axis of the floating crane (130) to monitor the ship's position. The lifting equipment (100) has built-in GNSS-RTK measuring points to monitor the real-time position of the hook and steel box girder during the lifting process. The cloud-based intelligent monitoring platform is fixed on the shore. The fourth laser rangefinder (131) and the high-definition camera (132) are installed on the top of the floating crane (130), and the inclinometer (133) is set on the deck of the floating crane (130).

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