A method for self-adaptive vertical rotation and lifting construction of long-span steel structures

Abstract

A method for self-adaptive vertical rotation and lifting construction of a long-span steel structure, which is used to vertically lift the steel structure in the vertical rotation area in a rotating manner to complete the high-altitude installation. The vertical rotation area includes several steel columns arranged at intervals and vertically. The method includes steps such as installing a lattice horizontal assembly jig group, installing a rotating hinge, assembling the steel structure, arranging a hydraulic lifting device, vertical rotation and lifting, fixing the steel structure, and quality inspection. The steel structure is placed obliquely and assembled at low altitude, and after assembly, it is vertically rotated and lifted in place. Compared with traditional methods such as high-altitude bulk method, strip or block installation method, sliding method, integral hoisting method, integral lifting method, integral jacking method, etc., the present invention can reduce the installation height of the support jig, reduce the amount of high-altitude work and the investment in large hoisting equipment, and improve the safety factor of construction.

Description

Technical Field

[0001] The present invention relates to the technical field of construction techniques for high-altitude structure conversion to low-altitude operation and subsequent lifting and installation in construction engineering, and particularly relates to a method for self-adaptive vertical rotation and lifting construction of large-span steel structures. Background Technique

[0002] To meet the functional requirements, the shapes and structural forms of steel structure venues are becoming increasingly diverse, continuously breaking through the existing height, span, and overhanging length, posing huge challenges to the safe and efficient construction of steel structures. It is crucial to adopt appropriate construction methods to control the project cost.

[0003] In large-span spatial steel structure projects, common installation methods include high-altitude bulk method, strip or block installation method, sliding method, integral hoisting method, integral lifting method, and integral jacking method. For complex steel structures with ultra-high, large-span, and large overhangs, using the above common installation methods will increase the installation height of the support falsework or raise the requirements for hoisting equipment. If the installation height of the support falsework is too high, its stability will be poor, affecting the safe construction of the structure; using large-scale hoisting equipment is not conducive to cost control. Moreover, the above common installation methods are mostly high-altitude operations, which are not conducive to ensuring the welding quality. For large steel structures, it is more necessary to convert high-altitude installation to low-altitude installation, reduce the installation height of the support falsework, reduce the amount of high-altitude operations and the investment in large-scale hoisting equipment, and improve the construction safety factor. Summary of the Invention

[0004] To solve the above problems, the present invention provides a method for self-adaptive vertical rotation and lifting construction of large-span steel structures. The present invention is implemented as follows:

[0005] A method for self-adaptive vertical rotation and lifting construction of large-span steel structures, which is used to vertically lift a steel structure in a vertical rotation area in a rotating manner to complete high-altitude installation. The vertical rotation area includes a plurality of steel columns arranged vertically at intervals. The method specifically includes the following steps:

[0006] S1. Install a lattice horizontal assembly falsework group. The lattice horizontal assembly falsework group includes two falsework units with the same structure and arranged at intervals in the vertical rotation area. Each falsework unit includes a plurality of lifting falseworks with gradually decreasing heights. A plurality of the lifting falseworks are connected to each other through transverse connecting beams. On one side of each falsework unit close to the lowest lifting falsework, a triangular support frame is also provided;

[0007] S2. Install a rotating hinge. The rotating hinge is fixedly arranged on the steel column on one side of the vertical rotation area close to the highest lifting falsework, and the rotation plane of the rotating hinge is coplanar with the extending arrangement directions of the plurality of lifting falseworks in the same-side falsework unit;

[0008] S3. Assemble the steel structure. Diagonally erect the main truss of the steel structure on the jig unit and connect the main truss to the rotating hinge. Subsequently, install the remaining secondary trusses and secondary components of the steel structure. Then, hingedly set the lower lifting points on the upper surface of the main truss, and set connecting members on other steel columns on the side away from the steel column where the rotating hinge is installed.

[0009] S4. Arrange the hydraulic lifting device. The hydraulic lifting device includes hoists, a hydraulic pump source, and a synchronous control system. The upper ends of several steel columns are connected by steel beams. The hoists are hingedly set on the lower surface of the steel beams and are located within the area of ±30 - 80 cm along the extension direction of the lifting jig projected from the lower lifting points to the steel beams. The lower lifting points are connected to the hoists by load-bearing steel strands.

[0010] S5. Vertical rotation and lifting. Drive the hoists by the hydraulic pump source to retract the load-bearing steel strands, thereby driving the steel structure to rotate and lift around the rotating hinge.

[0011] S6. Fix the steel structure. After the vertical rotation and lifting are in place, add reinforcement members at the lower end of the main truss, and then complete the fixation of the connecting members to the main truss by welding and screwing. Subsequently, install the filling section of the web members, and finally install other filling members.

[0012] S7. Conduct quality inspection. After passing the quality inspection, remove the reinforcement members, load-bearing steel strands, lower lifting points, hoists, and lattice-type horizontal assembly jigs in sequence, complete the installation, and enter the next process.

[0013] As a further improvement, step S4 specifically includes:

[0014] S401. System static commissioning of the hydraulic lifting device;

[0015] S402. Install the hydraulic lifting device;

[0016] S403. System dynamic commissioning of the hydraulic lifting device. Gradually load in increments of 20%, 40%, 60%, 80%, and 100% until the end of the steel structure away from the rotating hinge is vertically lifted by 10 cm, and then static for 12 hours. During this period, observe the working performance of each system.

[0017] As a further improvement, step S5 specifically includes:

[0018] S501. Stage leveling. During the vertical rotation, every time the end of the steel structure away from the rotating hinge is lifted by 1 m or the steel structure rotates by 5 - 10°, measure the elevations of each lower lifting point. If there is a height deviation between the lower lifting points, perform fine-tuning for a single lower lifting point until the elevations of each lower lifting point are the same.

[0019] As a further improvement, mounting steel plates are welded to the lower ends of each lifting support frame and triangular support frames within the support frame unit, and the mounting steel plates are fixedly connected to embedded steel plate members in the foundation through bolts;

[0020] On one side surface of the triangular support frame close to the rotary hinge, a receiving platform for bearing one end of the main truss away from the rotary hinge is further extended. Before hoisting, the lower construction column of the main truss abuts against the upper end of the triangular support frame.

[0021] As a further improvement, the rotary hinge specifically includes a base welded to the steel column. A plurality of reinforcing rib plates are further extended on the side wall surface of the base. A connecting plate is arranged vertically on the reinforcing rib plates, and a reinforcement hole is formed in the connecting plate;

[0022] A connecting sleeve is rotatably arranged at one end of the base away from the steel column through a pin shaft. The lower construction column of the main truss is fitted into the connecting sleeve and at least partially extends out, and the lower construction column of the main truss is fixedly connected to the connecting sleeve by welding;

[0023] A fixing plate is arranged on the outer side of the connecting sleeve, and a positioning hole is formed in the fixing plate. After the main truss is vertically hoisted in place, the positioning hole corresponds to the reinforcement hole, and the connecting sleeve is fixed by a fastening bolt passing through the positioning hole, the reinforcement hole and extending into the steel column.

[0024] As a further improvement, the connecting rod member includes a first connecting rod arranged on the steel column provided with a rotary hinge. After the main truss is vertically hoisted in place, the lower construction column of the main truss is inserted into the first connecting rod;

[0025] The connecting rod member further includes a second connecting rod arranged on the steel column on the side far from the rotary hinge. The lower end of the second connecting rod is open. After the main truss is vertically hoisted in place, the lower construction column of the main truss is sleeved in the second connecting rod;

[0026] After the main truss is vertically hoisted in place, the lower construction column is fixedly connected to the first connecting rod and the second connecting rod respectively by welding or screwing.

[0027] As a further improvement, a control module is further included. The control module includes a force receiving module, an analysis module, a timing module and a control module. The control module is respectively in communication connection with the analysis module, the synchronous control system, the hydraulic pump source and the timing module, and the force receiving module is in communication connection with the analysis module;

[0028] Before the step S1, the following is further included:

[0029] S101. Perform construction simulation calculations, and cooperate with stress analysis software to calculate the positions of the parts with concentrated stress, large stress, and large deformation.

[0030] S102. Preset monitoring points, and arrange strain monitoring points at the positions calculated in step S101. Each of the strain monitoring points is communicatively connected to the stress receiving module.

[0031] As a further improvement, the lifter is fixedly arranged on the lower surface of the steel beam, and the horizontal distance between the end of the main truss far from the rotating hinge and the completed vertical rotation assembly in the initial hoisting state does not exceed 200 cm.

[0032] As a further improvement, the lifter includes a traveling device. The traveling device is sleeved on the outer periphery of the steel beam. A first hinge seat is fixedly arranged at the lower end of the traveling device. An installation column is rotatably arranged on the first hinge seat. The hydraulic pump source is arranged in the installation column. The hydraulic pump source drives the hoisting rope winch to rotate, and the upper part of the load-bearing steel strand is wound around the hoisting rope winch.

[0033] The lower hoisting point includes a second hinge seat fixedly arranged on the upper structural column of the main truss. A pulley structure is rotatably arranged on the second hinge seat. The lower part of the load-bearing steel strand is wound around the pulley in the pulley structure.

[0034] As a further improvement, before step S5, it further includes:

[0035] S500. Install safety ropes, and tension and connect a number of safety ropes between the steel beam and the upper structural column of the main truss.

[0036] The beneficial effects of the present invention are as follows:

[0037] 1. By setting a rotating hinge on the steel column, connecting the main truss of the steel structure to be lifted to the rotating hinge, and obliquely arranging the whole steel structure on the lattice horizontal splicing jig group, and lifting it vertically by the hydraulic lifting device, it realizes the reduction of the overall height of the support jig, strengthens the application of high-altitude construction to low-altitude construction, and further reduces the amount of high-altitude work and the investment in large hoisting equipment.

[0038] 2. By setting a hydraulic lifting device, and setting a lower hoisting point at the end of the main truss far from the rotating hinge, connecting the lower hoisting point and the hydraulic lifting device by a load-bearing steel strand to stably lift the main truss, and controlling the synchronous lifting of multiple hoisting endpoints by a synchronous control system, it realizes stable lifting during the vertical rotation process. Compared with the traditional manual operation of multiple hoisting equipment, the working hours required are shorter, and the amount of fine-tuning and leveling work is smaller.

[0039] 3. One end of the main truss is connected to the rotating hinge throughout the process, and the trajectory during the vertical lifting process can be followed. The lifting process is more stable and safer compared to the traditional method using multiple large-scale hoisting equipment.

[0040] 4. By setting up the triangular support frame, the main truss is supported and limited by the triangular support frame during the low-altitude assembly operation, avoiding potential safety hazards caused by the sliding of the main truss due to inclined placement. At the same time, in cooperation with the rotating hinge, the safety factor of the low-altitude processing operation is higher.

[0041] 5. At the same time, the lower lifting point, the hoist and the steel structure are connected by a rotatable hinge, which can adapt to the change of the relative position of the hoist and the lower lifting point during the vertical rotation and lifting process in the vertical rotation area. That is, the lower lifting point rotates around the rotating hinge, and its movement trajectory is an arc line. The hoist and the lower lifting point can be adaptively adjusted to the tensile direction of the load-bearing steel strand, preventing the load-bearing steel strand from bending, improving the overall self-adaptability of the system, and extending the service life of the steel strand. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is an axonometric structural schematic diagram of the overall structural system in the initial state of the vertical rotation and lifting construction.

[0043] Figure 2 is Figure 1 front view of

[0044] Figure 3 It is the front view of the overall structural system during the vertical rotation and lifting process.

[0045] Figure 4 It is the front view of the overall structural system after the vertical rotation and lifting is completed.

[0046] Figure 5 It is the overall structural schematic diagram of the rotating hinge of the present invention.

[0047] Figure 6 It is the overall structural schematic diagram of the lower lifting point of the present invention.

[0048] Figure 7 It is the overall structural schematic diagram of the upper lifting point of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention.

[0050] In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0051] A method for self - adaptive vertical rotation and lifting construction of a long - span steel structure is used to vertically lift a steel structure 4 in a vertical rotation area in a rotational manner to complete high - altitude installation. The vertical rotation area includes several steel columns 2 arranged vertically at intervals. The method specifically includes the following steps:

[0052] S1. Install a lattice - type horizontal assembly jig group. The lattice - type horizontal assembly jig group includes at least two jig units 1 with the same structure and arranged at intervals in the vertical rotation area. Each jig unit 1 includes several lifting jigs 11 with gradually decreasing heights. The several lifting jigs 11 are connected to each other by transverse connecting beams 12. On one side of each jig unit 1 near the lowest lifting jig 11, a triangular support frame 13 is also provided. Specifically, each lifting jig 11 is fixedly arranged at the upper end of a pre - embedded steel plate.

[0053] S2. Install a rotating hinge 6. The rotating hinge 6 is fixedly arranged on the steel column 2 on one side of the vertical rotation area near the highest lifting jig 11, and the rotation plane of the rotating hinge 6 is coplanar with the extending arrangement direction of the several lifting jigs 11 in the same - side jig unit 1.

[0054] S3. Assemble the steel structure 4. Diagonally erect the main truss 41 of the steel structure 4 on the jig unit 1 and connect the main truss 41 to the rotating hinge 6. Subsequently, install the remaining secondary trusses and secondary components of the steel structure 4. Then, a lower lifting point 33 is hingedly arranged on the upper surface of the main truss 41, and a connecting rod member 5 is arranged on other steel columns 2 on the side away from the steel column 2 where the rotating hinge 6 is installed.

[0055] S4. Arrange the hydraulic lifting device 3. The hydraulic lifting device 3 includes a hoister 31, a hydraulic pump source, and a synchronous control system. The upper ends of several steel columns 2 are connected by steel beams 202. The hoister 31 is hinged to the lower surface of the steel beam 202 and is located within the area of ±30 - 80 cm along the extension direction of the lifting jig 11 where the lower suspension point 33 is projected onto the steel beam 202. A load-bearing steel strand 32 is connected between the lower suspension point 33 and the hoister 31. If there is no steel beam 202 above or the steel beam 202 is too far away, a steel truss 201 can also be arranged between the steel columns 2, and the hoister 31 is hinged to the lower surface of the steel truss 201

[0056] S5. Vertical rotation and lifting. The hoister 31 is driven by the hydraulic pump source to retract and hinge the load-bearing steel strand 32, thereby driving the steel structure 4 to rotate and lift around the rotating hinge 6;

[0057] S6. Fixing the steel structure 4. After the vertical rotation and lifting are in place, additional reinforcement members are added to the lower end of the main truss 41, and then the connecting members 5 and the main truss 41 are fixed by welding and screwing. Subsequently, the filling section of the web member is installed, and finally other filling members are installed;

[0058] S7. Conduct quality inspection. After passing the quality inspection, the reinforcement members, the load-bearing steel strand 32, the lower suspension point 33, the hoister 31, and the lattice-type horizontal assembly jig are removed in sequence to complete the installation and enter the next process.

[0059] Among them, during the lifting process, the main truss 41 as a whole moves in an arc with the rotating hinge 6 as the center. Therefore, the load-bearing steel strand 32 is not often in a vertical state, while the overall gravity of the main truss 41 is always vertically downward. If the position of the hoister 31 deviates too much, the component force borne by the load-bearing steel strand 32 during the lifting process will be much greater than the overall gravity of the main truss 41, which is likely to cause the load-bearing steel strand 32 to break. Therefore, it is preferably that the hoister 31 is fixedly arranged on the lower surface of the steel beam 202 and is located within the area of ±30 - 80 cm along the extension direction of the lifting jig 11 where the lower suspension point 33 is projected onto the steel beam 202.

[0060] Furthermore, the hoister 31 is fixedly arranged on the lower surface of the steel beam 202 and is located at a position 10 - 30 cm or 50 - 80 cm away from the side of the lower suspension point 33 projected onto the steel beam 202 and away from the rotating hinge 6. If it is located on the side closer to the rotating hinge 6 and deviates, the force on the load-bearing steel strand 32 will always increase during the stretching process, which is not conducive to the service life.

[0061] A deviation of 10 - 30 cm can make the force on the load-bearing steel strand 32 gradually decrease first and then slowly increase during the lifting process. After passing through the vertical point of the load-bearing steel strand 32, the service life of the load-bearing steel strand 32 can be ensured. A deviation of 50 - 80 cm can make the force on the load-bearing steel strand 32 gradually decrease during the lifting process, and there is always a component force that pulls the main truss 41 to move away from the rotary hinge 6, so as to ensure that the main truss 41 bears tension during the lifting process and can better reflect the stress performance of the main truss 41.

[0062] As a further improvement, the step S4 specifically includes:

[0063] S401. System static commissioning of the hydraulic lifting device 3;

[0064] S402. Install the hydraulic lifting device 3;

[0065] S403. System dynamic commissioning of the hydraulic lifting device 3, loading in increments of 20%, 40%, 60%, 80%, and 100% until one end of the steel structure 4 away from the rotary hinge 6 is vertically lifted by 10 cm, and then standing still for 12 hours. During this period, observe the working performance of each system.

[0066] As a further improvement, the step S5 specifically includes:

[0067] S501. Stage leveling. During the vertical rotation, after one end of the steel structure 4 away from the rotary hinge 6 is lifted by 1 m or the steel structure 4 rotates by 5 - 10°, measure the elevation of each lower suspension point 33. If there is a height deviation between the lower suspension points 33, perform fine adjustment on a single lower suspension point 33 until the elevations of all the lower suspension points 33 are the same.

[0068] As a further improvement, an installation steel plate is welded to the lower end of each lifting support 11 and the triangular support frame 13 in the support frame unit 1, and the installation steel plate is fixedly connected to the embedded steel plate member in the foundation by bolts;

[0069] A receiving platform for bearing one end of the main truss 41 away from the rotary hinge 6 is further extended on the surface of the triangular support frame 13 close to the rotary hinge 6. Before lifting, the lower structural column of the main truss 41 abuts against the upper end of the triangular support frame 13.

[0070] As a further improvement, the rotary hinge 6 specifically includes a base 61 welded to the steel column 2. A plurality of reinforcing rib plates 64 are further extended on the side wall surface of the base 61. A connecting plate 65 is arranged vertically on the reinforcing rib plate 64, and a reinforcement hole is opened on the connecting plate 65;

[0071] One end of the base 61 away from the steel column 2 is rotatably provided with a connecting sleeve 63 through a pin shaft 62. The lower structural column of the main truss 41 is fitted into the connecting sleeve 63 and at least partially extends out. The lower structural column of the main truss 41 is fixedly welded to the connecting sleeve 63.

[0072] A fixing plate 66 is arranged on the outer side of the connecting sleeve 63. A positioning hole is formed in the fixing plate 66. When the main truss 41 is vertically rotated and hoisted in place, the positioning hole corresponds to the reinforcement hole. The connecting sleeve 63 is fixed by a fastening bolt passing through the positioning hole, the reinforcement hole and extending into the steel column 2.

[0073] As a further improvement, the connecting rod member 5 includes a first connecting rod arranged on the steel column 2 provided with the rotary hinge 6. After the main truss 41 is vertically rotated and hoisted in place, the lower structural column of the main truss 41 is inserted into the first connecting rod.

[0074] The connecting rod member 5 further includes a second connecting rod arranged on the steel column 2 on the side away from the rotary hinge 6. The lower end of the second connecting rod is open. After the main truss 41 is vertically rotated and hoisted in place, the lower structural column of the main truss 41 is sleeved in the second connecting rod.

[0075] After the main truss 41 is vertically rotated and hoisted in place, the lower structural column is fixedly connected to the first connecting rod and the second connecting rod respectively by welding or screwing.

[0076] In another embodiment, the butt joint area between the butt joint member on the side away from the rotary hinge 6 and the main truss 41 is set as an inclined groove. A groove 42 adapted to the inclined groove is arranged in the main truss 41. That is, after the steel structure 4 is vertically rotated and hoisted in place, it can be directly butt-welded without setting an inserted section.

[0077] As a further improvement, it further includes a control module. The control module includes a force receiving module, an analysis module, a timing module and a control module. The control module is respectively communicatively connected to the analysis module, the synchronous control system, the hydraulic pump source and the timing module. The force receiving module is communicatively connected to the analysis module.

[0078] Before the step S1, it further includes:

[0079] S101. Construction simulation calculation, and cooperate with the stress analysis software to calculate the positions of the parts with concentrated stress, large stress and large deformation.

[0080] S102. Preset monitoring points, and arrange strain monitoring points at the positions calculated in the step S101. Each of the strain monitoring points is communicatively connected to the force receiving module.

[0081] Among them, the force receiving module is used to collect the monitoring data of each strain monitoring point and send the monitoring data to the analysis module. Stress limit thresholds of each node are preset in the analysis module. If the stress of a node exceeds the preset threshold, a corresponding alarm message is sent to the control module. The control module controls the hydraulic pump source to stop working and notifies relevant staff to give a warning. Subsequently, the staff determines whether to continue the vertical rotation work, stop the work for reinforcement and maintenance, or reverse and re-reinforce according to the actual situation. After manually inputting a control signal by the staff, the subsequent steps are continued.

[0082] As a further improvement, the lifter 31 is fixedly arranged on the lower surface of the steel beam 202. The horizontal distance between the end of the main truss 41 away from the rotary hinge 6 in the initial hoisting state and after the vertical rotation assembly is completed does not exceed 200 cm. If the horizontal distance in the initial hoisting state and after the vertical rotation assembly is completed is too large, it is easy to cause the deflection angle of the load-bearing steel strand 32 to be too large and the force change to be too large. If the horizontal distance in the initial hoisting state and after the vertical rotation assembly is completed is too small, it means that the starting height of the main truss 41 needs to be increased, or the vertical distance between the lower lifting point 33 and the lifter 31 needs to be increased.

[0083] To improve the adaptability of the overall structure of the present invention and enable it to adapt to various building environments. As a further improvement, the lifter 31 includes a traveling device. The traveling device is sleeved on the outer periphery of the steel beam 202. A first hinge seat 311 is fixedly arranged at the lower end of the traveling device. An installation column 312 is rotatably arranged on the first hinge seat 311. The hydraulic pump source is arranged in the installation column 312. The hydraulic pump source drives the hoisting rope winch to rotate. The upper part of the load-bearing steel strand 32 is wound around the hoisting rope winch;

[0084] The lower lifting point 33 includes a second hinge seat 331 fixedly arranged on the upper structural column of the main truss 41. A pulley structure 332 is rotatably arranged on the second hinge seat 331. The lower part of the load-bearing steel strand 32 is wound around the pulley in the pulley structure 332.

[0085] As a further improvement, before step S5, it further includes:

[0086] S500. Install safety ropes, and tension and connect a number of safety ropes between the steel beam 202 and the upper structural column of the main truss 41.

[0087] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for the self-adaptive vertical rotation and lifting construction of a long-span steel structure, characterized in that, It is used to vertically lift a steel structure in a vertical rotation area in a rotating manner to complete high-altitude installation. The vertical rotation area includes several steel columns arranged vertically at intervals. The specific steps are as follows: S1. Install the lattice horizontal assembly jig group. The lattice horizontal assembly jig group includes two jig units with the same structure and arranged at intervals in the vertical rotation area. Each jig unit includes several lifting jigs with gradually decreasing heights. The several lifting jigs are connected to each other by transverse connecting beams. A triangular support frame is also arranged on one side of each jig unit close to the lowest lifting jig. S2. Install the rotating hinge. The rotating hinge is fixedly arranged on the steel column on one side of the vertical rotation area close to the highest lifting jig, and the rotation plane of the rotating hinge is coplanar with the extended arrangement direction of the several lifting jigs in the jig unit on the same side. S3. Assemble the steel structure. Diagonally erect the main truss of the steel structure on the jig unit and connect the main truss to the rotating hinge. Subsequently, install the remaining secondary trusses and secondary components of the steel structure. Then, hinge a lower suspension point on the upper surface of the main truss, and arrange connecting members on other steel columns on the side far from the steel column where the rotating hinge is installed. S4. Arrange the hydraulic lifting device. The hydraulic lifting device includes a hoist, a hydraulic pump source, and a synchronous control system. The upper ends of several steel columns are connected by steel beams. The hoist is hingedly arranged on the lower surface of the steel beam and is located within the area of ±30 - 80 cm along the extended arrangement direction of the lifting jig projected from the lower suspension point to the steel beam. The lower suspension point and the hoist are connected by a load-bearing steel strand. S5. Vertically rotate and lift. The hydraulic pump source drives the hoist to retract the hinge of the load-bearing steel strand, thereby driving the steel structure to rotate and lift around the rotating hinge. S6. Fix the steel structure. After the vertical rotation and lifting are in place, additional reinforcement members are added to the lower end of the main truss, and then the connecting members are fixed to the main truss by welding and screwing. Subsequently, install the filling section of the web member, and finally install other filling members. S7. Conduct quality inspection. After the quality inspection is qualified, remove the reinforcement members, load-bearing steel strands, lower suspension points, hoists, and lattice horizontal assembly jig group in sequence, complete the installation, and enter the next process.

2. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 1, wherein The specific content of step S4 includes: S401. System static commissioning of the hydraulic lifting device; S402. Install the hydraulic lifting device; S403. System dynamic commissioning of the hydraulic lifting device. Gradually load in increments of 20%, 40%, 60%, 80%, and 100% until one end of the steel structure far from the rotating hinge is vertically lifted by 10 cm, and then let it stand for 12 hours. During this period, observe the working performance of each system.

3. The method for self - adaptive vertical rotation and lifting construction of a long - span steel structure according to claim 1, characterized in that, The specific content of step S5 includes: S501. Stage leveling. During the vertical rotation, after one end of the steel structure far from the rotating hinge is lifted by 1 m or the steel structure rotates by 5 - 10°, measure the elevation of each lower suspension point. If there is a height deviation between the lower suspension points, perform fine adjustment on a single lower suspension point until the elevations of all lower suspension points are the same.

4. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 1, characterized in that, An installation steel plate is welded at the lower end of each lifting cradle and the triangular support frame within the cradle unit, and the installation steel plate is fixedly connected to the embedded steel plate member in the foundation through bolts; A receiving platform for bearing the end of the main truss away from the rotating hinge is further extended on the surface of the triangular support frame near the rotating hinge, and the lower structural column of the main truss abuts against the upper end of the triangular support frame before hoisting.

5. The method for self - adaptive vertical rotation and lifting construction of a long - span steel structure according to claim 1, characterized in that, The rotating hinge specifically includes a base welded on the steel column, and a plurality of reinforcing rib plates are further extended on the side wall surface of the base. A connecting plate is arranged on the reinforcing rib plates in the vertical direction, and a reinforcement hole is formed in the connecting plate; A connecting sleeve is rotatably arranged at one end of the base away from the steel column through a pin shaft. The lower structural column of the main truss is adaptively sleeved in the connecting sleeve and at least partially protrudes out, and the lower structural column of the main truss is fixedly connected to the connecting sleeve by welding; A fixing plate is arranged on the outer side of the connecting sleeve, and a positioning hole is formed in the fixing plate. When the main truss is vertically hoisted in place, the positioning hole corresponds to the reinforcement hole, and the connecting sleeve is fixed by a fastening bolt passing through the positioning hole, the reinforcement hole and extending into the steel column.

6. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 5, characterized in that, The connecting rod member includes a first connecting rod arranged on the steel column provided with the rotating hinge. After the main truss is vertically hoisted in place, the lower structural column of the main truss is inserted into the first connecting rod; The connecting rod member further includes a second connecting rod arranged on the steel column on the side away from the rotating hinge. The lower end of the second connecting rod is open. After the main truss is vertically hoisted in place, the lower structural column of the main truss is sleeved in the second connecting rod; After the main truss is vertically hoisted in place, the lower structural column is fixedly connected to the first connecting rod and the second connecting rod respectively by welding or screwing.

7. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 1, characterized in that, It further includes a control module, and the control module includes a force receiving module, an analysis module, a timing module and a control module. The control module is respectively communicatively connected to the analysis module, the synchronous control system, the hydraulic pump source and the timing module, and the force receiving module is communicatively connected to the analysis module; Before the step S1, it further includes: S101. Construction simulation calculation, and cooperate with the stress analysis software to calculate the positions of the parts with concentrated stress, large stress and large deformation; S102. Preset monitoring points, and arrange strain monitoring points at the positions calculated in step S101. Each of the strain monitoring points is communicatively connected to the force receiving module.

8. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 7, characterized in that, The lifter is fixedly arranged on the lower surface of the steel beam, and the horizontal distance between the end of the main truss away from the rotating hinge in the initial hoisting state and after the vertical rotation assembly is completed does not exceed 200 cm.

9. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 7, characterized in that, The lifter includes a traveling device, the traveling device is sleeved on the outer periphery of the steel beam, a first hinge seat is fixedly arranged at the lower end of the traveling device, an installation column is rotatably arranged on the first hinge seat, the hydraulic pump source is arranged in the installation column, the hydraulic pump source drives the hoisting rope winch to rotate, and the upper part of the load-bearing steel strand is wound on the hoisting rope winch; The lower suspension point includes a second hinge seat fixedly arranged on the upper structural column of the main truss, a pulley structure is rotatably arranged on the second hinge seat, and the lower part of the load-bearing steel strand is wound around the pulley inside the pulley structure.

10. The method for self-adaptive vertical rotation and lifting construction of a long-span steel structure according to claim 1, characterized in that, Before the step S5, it further includes: S500. Install safety ropes, and tension and connect a number of safety ropes between the steel beam and the upper structural column of the main truss.

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