A whole hoisting and high-precision alignment construction method for lower cross beam of bridge tower steel

Abstract

This invention discloses a method for the overall hoisting and high-precision alignment of the lower steel crossbeam of a bridge tower. The method involves splicing the lower crossbeam into three segments: a pair of end segments and a middle segment. A spreader beam is installed on the upper side of the middle segment facing the end segments, eliminating the need for crossbeam supports. This significantly reduces the number of hoisting operations and the amount of splicing and matching measures required. Before lowering the middle segment, it is guided and limited by the pair of end segments, and then supported by three-way jacks on both sides. The three-way jacks are used for fine-tuning the alignment between the middle segment and the end segments, achieving precise adjustment and alignment of the overall lower crossbeam segment with the tower limb. This greatly improves construction efficiency, facilitates operation by construction personnel, reduces the workload of high-altitude welding, and improves welding quality.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology. More specifically, this invention relates to a method for the integral hoisting and high-precision alignment of the lower steel crossbeam of a bridge tower. Background Technology

[0002] Bridge tower crossbeams, as components connecting the two tower columns and forming a unified frame structure, play an indispensable role in preventing tilting or torsion of the tower columns when they are under independent stress, uniformly distributing the forces from the bridge deck system to the tower columns and foundations, restraining the displacement of the tower columns under horizontal loads, and ensuring the stress stability of the bridge superstructure and maintaining the overall stability of the tower body. Bridge tower steel crossbeams are widely used in modern bridge engineering due to their advantages such as high tensile strength, light weight, convenient construction, structural safety and reliability, short erection period, and diverse cross-sectional forms.

[0003] Bridge tower steel beams can be cut, welded, and painted in the factory, eliminating the need for cumbersome processes such as formwork, rebar tying, and pouring. They also have no curing period and can be quickly hoisted into place upon arrival at the site. In scenarios where construction sites are limited, such as high altitudes, crossing waterways, or mountainous areas, the transportation and hoisting of steel beams are more flexible, eliminating the need for large-area scaffolding. Compared to concrete beams, this reduces the construction period by approximately 30%-50%.

[0004] However, the traditional segmental installation of steel beams involves using hoisting equipment to lift prefabricated steel beam segments to the design position and connect them. This requires multiple hoisting, alignment, high-altitude splicing, and welding operations. The high-altitude work is time-consuming and the procedures are cumbersome. The segmental assembly is difficult to assemble, and the weld quality is hard to guarantee. This does not meet the current requirements for bridge construction efficiency and construction safety risk management. Summary of the Invention

[0005] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0006] Another objective of this invention is to provide a method for the overall hoisting and high-precision alignment of the lower steel crossbeam of a bridge tower, so as to solve the technical problems of high difficulty in splicing and aligning the steel crossbeam of a bridge tower at high altitude and difficulty in ensuring the quality of welds in the existing technology.

[0007] To achieve these objectives and other advantages according to the present invention, a method for integral hoisting and high-precision alignment of the lower steel crossbeam of a bridge tower is provided, comprising the following steps: S1. In the steel tower processing plant, the lower crossbeam is divided into three parts that can be spliced ​​together, including the two shorter end segments on both sides and the longer middle segment. The spreader beam is installed horizontally at the top of both ends of the middle segment, facing the top of the end segments. S2. Transport all segments of the lower crossbeam to the main pier position and stop them, then install horizontal cross braces on the tower columns on both sides. S3. Complete the hoisting of the tower column segment corresponding to the lower crossbeam position, and install the end segments on both sides onto the corresponding tower column segment; S4. Use horizontal bracing to align the tower segments on both sides, adjust the tower posture, and facilitate the connection between the end segments and the middle segments. S5. Fix a three-way jack at the top of the end segment and hoist the middle segment of the lower crossbeam to the designed height position. S6. The intermediate segment is hoisted to the three-way jacks of the corresponding end segment by the spreader beams on both sides. The hoisting tension is maintained, and the attitude of the intermediate segment is adjusted by the three-way jacks to complete the precise positioning of the intermediate segment. S7. Perform welding work on the intermediate and end segments, complete the installation of the lower crossbeam, and remove the spreader beam, three-way jacks, and hoisting connections.

[0008] Preferably, the spreader beam is a horizontally arranged rectangular frame beam structure, and the longer side of the rectangular frame beam is aligned with the length direction of the lower crossbeam. The outer end of the longer side of the rectangular frame beam extends out of the middle segment of the lower crossbeam to form an adjustment end for supporting the three-way jack on the corresponding side. The portion of the longer side of the rectangular frame beam located directly above the middle segment is detachably and fixedly connected to the middle segment along the length direction.

[0009] Preferably, the top surface of the intermediate segment is symmetrically fixed with lugs near the end edge along the width direction of the intermediate segment. A pair of lugs are located directly below the two longer sides of the rectangular frame beam. Each longer side of the spreader beam is symmetrically connected with lifting lugs on the upper and lower sides in the same vertical direction as the lugs. The upper lifting lugs are used to connect with the hook of the crane vessel, and the lower lifting lugs are used to detachably fix the lugs to the lugs with bolts.

[0010] Preferably, in the length direction of the lower crossbeam, the assembly surface of the end segment and the intermediate segment faces the center of the intermediate segment and is inclined downward.

[0011] Preferably, the ratio of the length of the top surface of the end segment to the length of the top surface of the lower crossbeam is 1:30.

[0012] Preferably, the ratio of the length of the spreader beam extending beyond the middle segment to the total length of the spreader beam is 1:7.

[0013] Preferably, the horizontal cross brace is composed of steel sections, and the two ends of the horizontal cross brace are provided with limiting holes corresponding to the height of the outer side of the tower limb on both sides. The horizontal cross brace is located below the lower cross beam and is installed after construction to the corresponding tower limb segment to adjust the tower limb posture.

[0014] Preferably, a level is arranged at both ends of the top of the intermediate section. The level is connected to a remote control terminal, which is also connected to the control terminal of the three-way jack. The vertical extension and retraction of the three-way jack on both sides is adjusted using the detection data of the level on both sides.

[0015] Preferably, before the intermediate segment enters between a pair of end segments, a combined guide mechanism is provided at the top of the end segment. The combined guide mechanism includes a apex corner capturing assembly arranged upward near the hoisting starting position and a traction stabilizing assembly arranged in the middle of the top of the end segment. The apex corner capturing assembly has a C-shaped member that can rotate in the horizontal plane and move elastically in the vertical plane. The C-shaped member provides buffering and abutment guidance to the corresponding side apex corner of the intermediate segment. The traction stabilization assembly includes a tie rod rotatably connected to the top surface of the end segment. The tie rod's rotation endpoint on the side facing the hoisting start position is located outside the end segment, and at this point, the distance between a pair of traction ends is greater than the maximum length of the intermediate segment. The tie rod's rotation endpoint on the side away from the hoisting start position is also located outside the end segment, and at this point, the distance between a pair of traction ends is less than the maximum length of the intermediate segment but greater than the minimum length of the intermediate segment. A traction rope is detachably connected to the outer end of the tie rod and the corresponding bottom end of the intermediate segment. By applying traction forces in different directions to the intermediate segment at different rotation points before and after the intermediate segment enters between a pair of end segments, stabilization is achieved.

[0016] This invention provides at least the following beneficial effects: a method for the overall hoisting and high-precision alignment of the lower crossbeam of a bridge tower. This method involves splicing the lower crossbeam into three segments: a pair of end segments and a middle segment. A flat beam is installed on the middle segment facing upwards towards the end segments, eliminating the need for crossbeam supports. This significantly reduces the number of hoisting operations and the amount of splicing and matching measures required. Before lowering the middle segment, it is guided and limited by the pair of end segments, then supported by three-way jacks on both sides. The three-way jacks are used for fine-tuning the alignment between the middle segment and the end segments, achieving precise adjustment and alignment of the lower crossbeam segments with the tower limbs. This greatly improves construction efficiency, facilitates operation by construction personnel, reduces the workload of high-altitude welding operations, and improves welding quality.

[0017] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0018] Figure 1 This is a front view structural diagram of the steel lower crossbeam structure corresponding to step S1 of the present invention. Figure 2This is a top view of the structure corresponding to step S2 of the present invention, which involves transporting the lower crossbeam to the main pier. Figure 3 This is a front view structural diagram of steps S3-S4 of the present invention; Figure 4 This is the main structural view of the lower crossbeam being hoisted in step S5 of the present invention; Figure 5 This is a top view of the steel lower crossbeam structure of the present invention after splicing is completed; Figure 6 A front view structural diagram showing the movement of the intermediate segment guided by a combined guide mechanism according to an embodiment of the present invention; Figure 7 A top view of a combined guide mechanism according to an embodiment of the present invention; Figure 8 A side view of a combined guide mechanism according to an embodiment of the present invention.

[0019] The following are the reference numerals in the accompanying drawings: 1. Intermediate segment, 2. End segment, 3. Spreader beam, 4. Transport ship, 5. Main pier of bridge tower, 6. Horizontal brace, 7. Three-way jack, 8. Crane ship, 9. Steel tower segment, 10. Combined guide mechanism, 11. Track, 12. Telescopic cylinder, 13. Column, 14. Spring, 15. Pressure component, 16. C-shaped component, 17. Limit ball, 18. Tie rod, 19. Traction rope, 20. Hydraulic drum. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0021] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] like Figure 1-5 As shown, the present invention provides a method for the overall hoisting and high-precision alignment of the lower steel crossbeam of a bridge tower, comprising the following steps: S1. In the steel tower processing plant, the lower crossbeam is divided into three parts that can be spliced ​​together, including two shorter end segments 2 and a longer middle segment 1. The top of both ends of the middle segment 1 is installed horizontally above the end segments 2. The two end segments 2 and the middle segment 1 are spliced ​​together to form a complete steel lower crossbeam. One end of the spreader beam 3 is pre-fixed to the top of the middle segment 1, and the other end is used to support the end segments 2 before welding.

[0023] S2. Load all segments of the lower crossbeam onto the transport ship 4 and transport them to the main pier 5. Continue to construct the tower column segments upwards until the corresponding tower column segments of the lower crossbeam are ready to be constructed. Install horizontal cross braces 6 on the tower columns on both sides for subsequent adjustment of the position of the tower column segments in the plane.

[0024] S3. Complete the hoisting of the tower column segment corresponding to the lower crossbeam position, and install the end segments 2 on both sides to the corresponding tower column segment 9 to ensure the accuracy of the installation position.

[0025] S4. Use the horizontal cross brace 6 to align the tower segments on both sides, adjust the tower posture, and facilitate the connection between the end segment 2 and the middle segment 1.

[0026] S5. Fix the three-way jack 7 at the top of the end segment 2 and hoist the middle segment 1 of the lower crossbeam to the designed height position. S6. The intermediate segment 1 is suspended from the two side spreader beams 3 onto the three-way jacks 7 of the corresponding end segment 2, so that the intermediate segment 1 is located between a pair of end segments 2. The outer end of the spreader beam 3 is designed to cover the top of the three-way jacks 7. The three-way jacks 7 are pre-lifted to a certain height according to the height requirements of the intermediate segment 1. The intermediate segment 1 is guided and limited in the length direction of the lower crossbeam by a pair of end segments 2. The intermediate segment 1 is lowered until the spreader beam 3 is supported on the three-way jacks 7. A certain lifting tension is maintained. The three-way jacks 7 are used to adjust the posture of the intermediate segment 1 to complete the precise positioning of the intermediate segment 1.

[0027] S7. Perform welding work on the intermediate segment 1 and the end segment 2, complete the installation of the lower crossbeam, and remove the spreader beam 3, the three-way jack 7, and the hoisting connection.

[0028] The present invention relates to a method for the overall hoisting and high-precision alignment of the lower crossbeam of a bridge tower. This method involves splicing the lower crossbeam into three segments: a pair of end segments 2 and a middle segment 1. A flat beam 3 is installed on the upper side of the middle segment 1 facing the end segments 2, eliminating the need for crossbeam supports. This significantly reduces the number of hoisting operations and the amount of splicing and matching measures required. Before lowering the middle segment 1, it is guided and limited by the pair of end segments 2, and then supported by three-way jacks 7 on both sides. The three-way jacks 7 then finely adjust the alignment between the middle segment 1 and the end segments 2, achieving precise adjustment and alignment of the lower crossbeam segments with the tower limbs. This greatly improves construction efficiency, facilitates operation by construction personnel, reduces the workload of high-altitude welding, and improves welding quality.

[0029] In another technical solution, such as Figure 5 As shown, the spreader beam 3 is a horizontally arranged rectangular frame beam structure, and the longer side of the rectangular frame beam is in the same direction as the length of the lower crossbeam. The outer end of the longer side of the rectangular frame beam extends out of the middle segment 1 of the lower crossbeam to form the adjustment end for supporting the three-way jack 7 on the corresponding side. The part of the longer side of the rectangular frame beam located directly above the middle segment 1 is detachably and fixedly connected to the middle segment 1 along the length direction.

[0030] Multiple fixing points are set between the two longer sides of the rectangular frame beam and the middle segment 1, respectively, on the part directly above the top surface of the middle segment 1, to improve the structural strength and support stability of the spreader beam 3. Two three-way jacks 7 are symmetrically arranged at the outer corner of the rectangular frame beam beyond the middle segment 1, and a set of three-way jacks 7 is arranged at the four corners of the middle segment 1 to balance and adjust the posture of the middle segment 1 in three-dimensional space.

[0031] In another technical solution, such as Figure 1 , 3 As shown in Figures 4, 5, and 6, symmetrical lugs are fixed to the top surface of the intermediate segment 1 near its end edge along the width direction of the intermediate segment 1. A pair of lugs are located directly below the two longer sides of the rectangular frame beam. Each longer side of the spreader beam 3 is symmetrically connected to lifting lugs on both the upper and lower sides in the same vertical direction as the lugs. The upper lifting lugs are used to connect to the hook of the crane vessel 8, and the lower lifting lugs are used to detachably fix the lugs to the lugs using bolts. The upper and lower lifting lugs are arranged to balance the upward force applied by the hook of the crane vessel 8 and the downward force applied by the gravity of the intermediate segment 1.

[0032] In another technical solution, such as Figure 1 , 3As shown in Figures 5 and 6, along the length of the lower crossbeam, the assembly surfaces of the end segment 2 and the middle segment 1 face the center of the middle segment 1 and are inclined downwards. The cross-sections of the end segment 2 and the middle segment 1 of the lower crossbeam are non-vertical straight lines, with the end segment being shorter at the top and longer at the bottom, and the middle segment 1 being longer at the top and shorter at the bottom. This facilitates the overall lower crossbeam segment lowering and installation. As long as the levelness of the middle segment 1 is ensured during the lowering process, it can play a guiding role along the length of the lower crossbeam. In conjunction with the three-way jack 7, the spatial posture of the middle segment 1 can be adjusted, reducing the adjustment difficulty of the three-way jack 7 and improving the adjustment efficiency. Subsequently, the three-way jack 7 mainly controls the alignment accuracy in the width direction of the lower crossbeam. This cross-sectional design significantly improves the construction safety of the lower crossbeam, making it less likely for the middle segment to misalign and fall.

[0033] In another technical solution, such as Figure 1 , 3 As shown in Figures 5 and 6, the ratio of the length of the top surface of the end segment 2 to the length of the top surface of the lower crossbeam is approximately 1:30. The two end segments 2 have the same shape and are symmetrical, which improves the overall support strength of the lower crossbeam and facilitates welding construction.

[0034] In another technical solution, such as Figure 1 , 3 As shown in Figures 5 and 6, the ratio of the length of the spreader beam 3 extending beyond the intermediate segment 1 to the total length of the spreader beam 3 is 1:7. If the spreader beam 3 is 7m long and 0.9m high, extending approximately 1m beyond the end of the lower crossbeam segment and supported by the three-way jack 7 at the end of the lower crossbeam, the supporting capacity of the spreader beam 3 must meet the hoisting requirements.

[0035] In another technical solution, such as Figure 3 As shown, the horizontal cross brace 6 is composed of steel sections. The two ends of the horizontal cross brace 6 are provided with limiting holes corresponding to the height of the outer side of the tower limb on both sides. The horizontal cross brace 6 is located below the lower cross beam and is installed after construction to the corresponding tower limb segment. It is used to align the top tower column segment, control the distance between the tower column segments on both sides, and the position of the tower limb relative to the steel tower in the horizontal plane, and adjust the posture of the tower limb.

[0036] In another technical solution, such as Figure 1 , 3As shown in Figure 5, a level is arranged at both ends of the top of the intermediate segment 1. The level is connected to a remote control terminal, which is also connected to the control terminal of the three-way jack 7. Using the detection data of the level on both sides, the vertical offset of the top corner of the intermediate segment 1 relative to the center is calculated, and the vertical extension of the three-way jack 7 on both sides is calculated in advance to facilitate the receiving of the intermediate segment 1. The intermediate segment 1 is initially placed on the three-way jack 7. The vertical extension is adjusted by the three-way jack 7 on each side to make the intermediate segment 1 tend to be horizontal. Then, the deviation of the lower crossbeam in the length and width directions is adjusted. Finally, it is precisely and synchronously moved down to complete the embedded splicing and alignment of the intermediate segment 1.

[0037] In another technical solution, such as Figure 6-8 As shown, it also includes a combined guiding mechanism, which includes a apex-angle capture assembly positioned upwards near the hoisting starting position and a traction stabilization assembly positioned at the top center of the end segment. The apex-angle capture assembly consists of a track 11 detachably fixed upwards on the top of the end segment 2 near the hoisting starting position, extending to the corresponding apex. A telescopic cylinder 12 is fixed on the track, and a column 13 is fixed to the end of the telescopic cylinder. The lower end of the column 13 is slidably connected to the track 11. A slide rod is provided at the upper end of the column 13, and a spring 14 is sleeved and supported at the lower end of the slide rod. A pressure member 15 is slidably sleeved at the upper end of the slide rod, and the lower end of the pressure member 15 abuts against the top of the spring 14. A groove is provided circumferentially on the outer side of the upper end of the pressure member 15, and a C-shaped member 16 is rotatably sleeved outwards within the groove. Both ends of the C-shaped member 16 extend outwards... The intermediate segment 1 has an inclined top section with limit balls 17 attached to its ends, and elastic buffer pads on the outside of the limit balls 17. The traction stabilization assembly includes an L-shaped pull rod 18 rotatably connected to the top center of the end section 2. The outer end of the pull rod 18 is the traction end, which is connected to a traction rope 19. The other end of the traction rope is detachably connected to the corresponding bottom end of the intermediate segment 1. A hydraulic drum 20 is also provided at the top of the end section 2 for winding and unwinding the traction rope 19. When the pull rod rotates towards the starting position, its endpoint is located outside the end section, and the distance between the pair of traction ends is greater than the maximum length of the intermediate segment. When the pull rod rotates away from the starting position, its endpoint is also located outside the end section, and the distance between the pair of traction ends is less than the maximum length of the intermediate segment but greater than its minimum length. Grooves or through channels for guiding the traction rope can be provided on the pull rod. Hooks for docking with the traction rope are detachably installed at both ends of the bottom of the intermediate segment.

[0038] The combined guiding mechanism in this embodiment is used to guide the intermediate segment as it enters the space between a pair of end segments, thereby improving the efficiency of capturing the intermediate segment quickly and smoothly as it enters the space between the pair of end templates. First, the intermediate segment is hoisted to a position slightly higher than the pair of end segments and facing the gap between them. Then, a pair of pull rods are rotated to a point close to the intermediate segment and fixed. At this point, a pair of traction ropes pull the intermediate segment outwards towards its length direction for balance. The traction ropes are then retracted and taut via a hydraulic roller, providing traction balance at both ends of the intermediate segment along its length to reduce swaying during movement, until the two apex corners of the intermediate segment approach and abut. The C-shaped component, with the middle section continuing to move forward, is pushed and squeezed to rotate, further enhancing the precise guidance of the middle section within a small range. The pull rod is rotated to the front of the pair of end sections to be moved by the middle section, and their relative positions are fixed. At this time, the traction ropes on both sides apply a force to the middle section in the length direction toward the center of the middle section. Then, the column is moved back by the telescopic cylinder, so that the C-shaped component is away from the middle section and does not interfere with the middle section's continued forward movement. With the traction of the lifting vessel's hook and the traction rope of the pull rod assisting in stabilization, the middle section moves forward until it is easy to land on a pair of receiving three-way jacks. The connection between the pull rod's traction rope and the middle section is released, and the position of the middle section is then finely adjusted by the three-way jacks.

[0039] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for integral hoisting and high-precision alignment of the lower steel crossbeam of a bridge tower, characterized in that, Includes the following steps: S1. In the steel tower processing plant, the lower crossbeam is divided into three parts that can be spliced ​​together, including the two shorter end segments on both sides and the longer middle segment. The spreader beam is installed horizontally at the top of both ends of the middle segment, facing the top of the end segments. S2. Transport all segments of the lower crossbeam to the main pier position and stop them, then install horizontal cross braces on the tower columns on both sides. S3. Complete the hoisting of the tower column segment corresponding to the lower crossbeam position, and install the end segments on both sides onto the corresponding tower column segment; S4. Use horizontal bracing to align the tower segments on both sides, adjust the tower posture, and facilitate the connection between the end segments and the middle segments. S5. Fix a three-way jack at the top of the end segment and hoist the middle segment of the lower crossbeam to the designed height position. S6. The intermediate segment is hoisted to the three-way jacks of the corresponding end segment by the spreader beams on both sides. The hoisting tension is maintained, and the attitude of the intermediate segment is adjusted by the three-way jacks to complete the precise positioning of the intermediate segment. S7. Perform welding work on the intermediate and end segments, complete the installation of the lower crossbeam, and remove the spreader beam, three-way jacks, and hoisting connections.

2. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 1, characterized in that, The spreader beam is a horizontally arranged rectangular frame beam structure, and the longer side of the rectangular frame beam is in the same direction as the length of the lower crossbeam. The outer end of the longer side of the rectangular frame beam extends out of the middle segment of the lower crossbeam to form the adjustment end for supporting the three-way jack on the corresponding side. The part of the longer side of the rectangular frame beam located directly above the middle segment is detachably and fixedly connected to the middle segment along the length direction.

3. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 2, characterized in that, The top surface of the intermediate segment is symmetrically fixed with lugs near the end edge along the width direction of the intermediate segment. A pair of lugs are located directly below the two longer sides of the rectangular frame beam. Each longer side of the spreader beam is symmetrically connected with lifting lugs on the upper and lower sides in the same vertical direction as the lugs. The upper lifting lugs are used to connect with the hook of the crane vessel, and the lower lifting lugs are used to detachably fix the lugs to the lugs with bolts.

4. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 1, characterized in that, Along the length of the lower crossbeam, the assembly surfaces of the end segments and the intermediate segments face the center of the intermediate segments and are inclined downwards.

5. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 4, characterized in that, The ratio of the length of the top surface of the end segment to the length of the top surface of the lower crossbeam is 1:

30.

6. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 1, characterized in that, The ratio of the length of the spreader beam extending beyond the middle segment to the total length of the spreader beam is 1:

7.

7. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 1, characterized in that, The horizontal cross brace is composed of steel sections. Both ends of the horizontal cross brace are provided with limiting holes corresponding to the height of the outer side of the tower limb on both sides. The horizontal cross brace is located below the lower cross beam and is installed after construction to the corresponding tower limb segment to adjust the tower limb posture.

8. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 1, characterized in that, A level is also arranged at both ends of the top of the middle section. The level is connected to a remote control terminal, which is also connected to the control terminal of the three-way jack. The vertical extension and retraction of the three-way jack on both sides is adjusted using the detection data of the level on both sides.

9. The method for integral hoisting and high-precision alignment of the lower steel crossbeam of the bridge tower as described in claim 1, characterized in that, Before the intermediate segment enters between a pair of end segments, a combined guide mechanism is set on the top of the end segment. The combined guide mechanism includes a apex corner capturing assembly set upward near the hoisting starting position and a traction stabilizing assembly set in the middle of the top of the end segment. The apex corner capturing assembly has a C-shaped component that can rotate in the horizontal plane and move elastically in the vertical plane. The C-shaped component provides buffering and abutment guidance to the corresponding side apex corner of the intermediate segment. The traction stabilization assembly includes a tie rod rotatably connected to the top surface of the end segment. The tie rod's rotation endpoint on the side facing the hoisting start position is located outside the end segment, and at this point, the distance between a pair of traction ends is greater than the maximum length of the intermediate segment. The tie rod's rotation endpoint on the side away from the hoisting start position is also located outside the end segment, and at this point, the distance between a pair of traction ends is less than the maximum length of the intermediate segment but greater than the minimum length of the intermediate segment. A traction rope is detachably connected to the outer end of the tie rod and the corresponding bottom end of the intermediate segment. By applying traction forces in different directions to the intermediate segment at different rotation points before and after the intermediate segment enters between a pair of end segments, stabilization is achieved.

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