Main tower top lifting system and main tower top lifting construction method

Abstract

The present invention provides a main tower top lifting system and a main tower top lifting construction method. The main tower top lifting system includes a hydraulic jacking device and a main tower turning support, and the main tower turning support is rotatably connected to one end of the main tower; the hydraulic jacking device includes a hydraulic crawler, a support rod and a jacking and turning support, and one end of the support rod is rotatably connected to the jacking and turning support; the other end of the support rod away from the jacking and turning support is connected to the other end of the main tower away from the main tower turning support; the hydraulic crawler is movably connected to the support rod and can crawl along the extension direction of the support rod; when the hydraulic crawler crawls towards the side away from the jacking and turning support, it can drive the other end of the main tower to rotate around the main tower turning support, and after the main tower rotates, it drives the support rod to rotate around the jacking and turning support. This system does not need to set up a high-position gantry or high-position jack, greatly saving the consumption and cost of auxiliary measures, reducing the lifting difficulty and safety risk of the main tower, and greatly improving the lifting efficiency of the main tower.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting of the main tower of a cable-stayed bridge, and particularly relates to a main tower top-lifting system and a main tower top-lifting construction method. Background Art

[0002] In the field of hoisting the main tower of a cable-stayed bridge with a weight of nearly a thousand tons, a hydraulic lifting technology using steel strands as rigging is often used to integrally turn over and install the main tower of the cable-stayed bridge. In this installation method, it is generally necessary to temporarily build a high-position gantry near the root of the main tower, and a hydraulic lifter is arranged at the end of the top cross beam of the gantry near the main tower side to lift the main tower, and a balanced guy cable device is arranged at the other end of the top cross beam. The hydraulic lifter is used to continuously adjust the verticality of the gantry, that is, an installation method of lifting while adjusting the balanced guy cable. This method has a high cost for building the high-position gantry, a large occupied area for the traction measures, a high difficulty in high-altitude operation of the hydraulic lifter and a high safety risk. At the same time, since the force on the high-position gantry changes with the change of the turning angle of the main tower, it is necessary to adjust the verticality of the gantry at any time. The adjustment process is complex to operate, time-consuming and laborious, and the working efficiency is low.

[0003] In the prior art, another method for turning over and installing the main tower is to traction and turn over the main tower at a low position. In this method, it is mostly necessary to use a hydraulic jack to lift and turn over the end of the main tower by a certain height in the starting state so that the main tower has a certain initial turning angle. In order to make the main tower have a basic starting angle, it is necessary to gradually increase the height of the jack using a cushion block, and a relatively high replacement cushion block is required. With such a setting, as the height of the cushion block increases, the support stability of the jack gradually becomes worse, and the safety risk is very high. At the same time, even when the jack reaches the maximum height, the turning angle of the main tower is still small. During the subsequent lifting process using a hydraulic lifter, due to the insufficient traction arm, it is necessary to make the hydraulic lifter have a large traction force, which places extremely high requirements on the hydraulic lifter and related foundations, and the feasibility is poor.

[0004] Therefore, there is an urgent need to provide a main tower top-lifting system and a main tower top-lifting construction method that can reduce the occupied area, reduce the traction force, and have high safety. Summary of the Invention

[0005] The purpose of the present invention is to provide a main tower top-lifting system and a main tower top-lifting construction method to solve the problems of large traction force, large occupied area, and large potential safety hazards in the existing main tower lifting system.

[0006] To achieve at least one of the above objects, the present invention provides a main tower lifting system for flipping the main tower of a cable-stayed bridge, which includes a hydraulic jacking device and a main tower flipping support; the main tower flipping support is rotatably connected to one end of the main tower; the hydraulic jacking device includes a hydraulic crawler, a support rod, and a jacking and flipping support; one end of the support rod is rotatably connected to the jacking and flipping support; the other end of the support rod away from the jacking and flipping support is connected to the other end of the main tower away from the main tower flipping support; the hydraulic crawler is movably connected to the support rod and can crawl along the extending direction of the support rod; when the hydraulic crawler crawls toward the side away from the jacking and flipping support, it can drive the other end of the main tower to rotate around the main tower flipping support, and after the main tower rotates, it drives the support rod to rotate around the jacking and flipping support.

[0007] Optionally, the main tower lifting system further includes a pushing support, the pushing support is sleeved on the support rod and is hinged to the other end of the main tower; the number of the hydraulic crawlers is multiple, and the pushing support is connected to all the hydraulic crawlers; when each hydraulic crawler crawls, it can drive the pushing support to move on the support rod, and after the pushing support moves, it can drive the other end of the main tower to rotate around the main tower flipping support.

[0008] Optionally, the hydraulic jacking device further includes a slide rail, the slide rail is arranged along the extending direction of the support rod and is fixedly connected to the support rod; the number of the slide rails corresponds to the number of the hydraulic crawlers, a base is arranged at the end of the hydraulic crawler away from the pushing support, and the base is slidably connected to a corresponding slide rail;

[0009] The hydraulic crawler has an extended cylinder state and a retracted cylinder state; when the hydraulic crawler is in the extended cylinder state, the base can be locked to a corresponding slide rail, and the hydraulic crawler can drive the pushing support to drive the other end of the main tower to rotate; when the hydraulic crawler is in the retracted cylinder state, the base can be unlocked from a corresponding slide rail, and the hydraulic crawler can follow the pushing support to move on the support rod.

[0010] Optionally, a guide plate is arranged on the base, and a guide groove is arranged on the slide rail; after the base is installed on the slide rail, the guide plate can be placed in the guide groove to define the moving direction of the hydraulic crawler on the support rod.

[0011] Optionally, the multiple hydraulic crawlers are evenly arranged in the circumferential direction of the support rod.

[0012] Optionally, the main tower top-lifting system further includes a main tower ear plate, which is fixedly connected to the other end of the main tower and can be rotatably connected to the jacking support; after the jacking support moves, it can drive the main tower to rotate through the main tower ear plate.

[0013] Optionally, the jacking support includes a support body and at least two upper ear plates. The support body is sleeved on the support rod with the slide rail. The jacking support is arranged on the side of the hydraulic crawler away from the jacking and flipping support. All the upper ear plates are arranged on the side of the jacking support away from the hydraulic crawler; all the upper ear plates are connected to the main tower ear plate, and the center lines of the pin holes of all the upper ear plates are parallel to the rotation axis of the main tower flipping support.

[0014] Optionally, the jacking support further includes at least two lower ear plates. All the lower ear plates are evenly arranged in the circumferential direction of the jacking support, and each lower ear plate is connected to a corresponding hydraulic crawler.

[0015] Optionally, the main tower top-lifting system further includes a hydraulic lifting device, which is connected to the other end of the main tower away from the main tower flipping support. The hydraulic lifting device and the hydraulic jacking device are arranged on opposite sides of the main tower;

[0016] Under the jacking of the hydraulic jacking device, the main tower has a flipping angle after rotation. The hydraulic lifting device is used to continue driving the other end of the main tower to rotate around the main tower flipping support after the flipping angle of the main tower reaches the predetermined starting angle.

[0017] Optionally, the hydraulic lifting and jacking device includes a traction cable and a hydraulic lifter; one end of the traction cable is connected to the main tower, and the other end is connected to the hydraulic lifter; the hydraulic lifter can gradually tighten the traction cable to drive the other end of the main tower to rotate around the main tower flipping support.

[0018] Optionally, the hydraulic lifting and jacking device further includes a traction anchor seat, a lifter fixing frame and a traction flipping support. The traction cable is connected to the main tower through the traction anchor seat; the lifter fixing frame is rotatably connected to the traction flipping support, and the hydraulic lifter is installed in the lifter fixing frame;

[0019] After the hydraulic lifting device drives the main tower to rotate, the lifter fixing frame can rotate around the traction anchor seat so that the traction cable cannot be bent during the lifting process.

[0020] Optionally, the main tower is an axisymmetric structure, and the symmetry axis of the main tower is perpendicular to the rotation axis of the main tower flipping support.

[0021] Optionally, the number of the hydraulic lifting devices and the hydraulic jacking devices is plural, and the plural hydraulic lifting devices are symmetrically arranged about the symmetry axis of the main tower. Optionally, the main tower top lifting system further includes an anti-overturning device, which is connected to the other end of the main tower and is configured to prevent the main tower from overturning due to the rotation angle exceeding 90°; the anti-overturning device and the hydraulic jacking device are arranged on the same side of the main tower.

[0022] To achieve at least one of the above purposes, the present invention further provides a main tower top lifting construction method, which adopts the main tower top lifting system described in any one of the above, and includes the working steps of lifting the main tower, including:

[0023] The hydraulic crawler includes a first group of hydraulic crawlers and a second group of hydraulic crawlers. When all the first group of hydraulic crawlers are in the cylinder extending state, the first group of hydraulic crawlers drive the main tower to rotate around the main tower turning support when crawling on the support rod, and the second group of hydraulic crawlers move along with the end of the main tower away from the main tower turning support; when all the first group of hydraulic crawlers extend the cylinder to the limit position, all the second group of hydraulic crawlers are in the cylinder extending state, all the first group of hydraulic crawlers are in the cylinder retracting state, and the second group of hydraulic crawlers continue to drive the main tower to rotate around the main tower turning support when crawling on the support rod, and the first group of hydraulic crawlers move along with the end of the main tower away from the main tower turning support, so that the first group of hydraulic crawlers and the second group of hydraulic crawlers alternately crawl on the support rod and continuously drive the main tower to rotate.

[0024] Optionally, the main tower top lifting system further includes a hydraulic lifting device, which is connected to the other end of the main tower away from the main tower turning support, and the hydraulic lifting device and the hydraulic jacking device are arranged on the opposite sides of the main tower;

[0025] When the main tower rotates to a predetermined starting angle under the jacking of the hydraulic jacking device, the hydraulic lifting device can continue to drive the other end of the main tower to rotate around the main tower turning support until the main tower is flipped to a predetermined installation angle.

[0026] In the main tower top lifting system and the main tower top lifting construction method provided by the present invention, the main tower top lifting system includes a hydraulic lifting device and a main tower turning support, and the main tower turning support is rotatably connected to one end of the main tower; the hydraulic lifting device includes a hydraulic crawler, a support rod, and a lifting and turning support, and one end of the support rod is rotatably connected to the lifting and turning support; the other end of the support rod away from the lifting and turning support is connected to the other end of the main tower away from the main tower turning support; the hydraulic crawler is movably connected to the support rod and can crawl along the extending direction of the support rod; when the hydraulic crawler crawls towards the side away from the lifting and turning support, it can drive the other end of the main tower to rotate around the main tower turning support, and after the main tower rotates, it drives the support rod to rotate around the lifting and turning support.

[0027] This main tower top lifting system does not need to set up a high-position gantry or high-position jack, greatly saving the consumption and cost of auxiliary measures, effectively reducing the lifting difficulty and safety risk of the main tower, and greatly improving the lifting efficiency of the main tower. At the same time, this main tower top lifting system has a small floor area and is particularly suitable for the installation operation of the main tower in areas with narrow sites and complex terrains. Brief Description of the Drawings

[0028] Figure 1 It is a simplified structural schematic diagram of the main tower top lifting system in a preferred embodiment of the present invention;

[0029] Figure 2 It is a front view structural schematic diagram of the main tower top lifting system in a preferred embodiment of the present invention, wherein the main tower is in the position before being lifted by the hydraulic lifting device;

[0030] Figure 3 It is a front view structural schematic diagram of the main tower top lifting system in another preferred embodiment of the present invention, wherein the main tower is in the position after being lifted by the hydraulic lifting device;

[0031] Figure 4 It is a top view structural schematic diagram of the main tower top lifting system in a preferred embodiment of the present invention;

[0032] Figure 5 It is a partial front view structural schematic diagram of the main tower top lifting system in a preferred embodiment of the present invention, wherein the solid line represents the position of the main tower before being lifted by the hydraulic lifting device, and the dashed line represents the position of the main tower after being lifted by the hydraulic lifting device;

[0033] Figure 6 It is a partial front view structural schematic diagram of the hydraulic lifting device in a preferred embodiment of the present invention;

[0034] Figure 7 It is Figure 6 the schematic diagram of the A-A cross-section in

[0035] Figure 8 It is a top view structural schematic diagram of a support rod and a slide rail in a preferred embodiment of the present invention;

[0036] Figure 9 It is a three-dimensional structural schematic diagram of a jacking support in a preferred embodiment of the present invention;

[0037] Figure 10 It is a top view structural schematic diagram of a jacking support in a preferred embodiment of the present invention;

[0038] Figure 11 It is a front view structural schematic diagram of a jacking support in a preferred embodiment of the present invention;

[0039] Figure 12 It is a partial front view structural schematic diagram of the main tower top lifting system in a preferred embodiment of the present invention, wherein the solid line represents the position of the main tower before being lifted by the hydraulic lifting equipment, and the dashed line represents the position of the main tower after being lifted by the hydraulic lifting equipment;

[0040] Figure 13 It is a front view structural schematic diagram of the main tower top lifting system in another preferred embodiment of the present invention;

[0041] Figure 14 It is a top view structural schematic diagram of the main tower top lifting system in another preferred embodiment of the present invention.

[0042] [Explanation of reference numerals is as follows]:

[0043] Main tower 1; main tower bracket 11; hydraulic jacking equipment 2; hydraulic crawler 21; support rod 22; jacking and flipping support 23; jacking support 24; support body 241; upper ear plate 242; lower ear plate 243; central hole 244; slide rail 25; guide groove 251; base 26; guide plate 261; clamping block 262; main tower flipping support 3; main tower ear plate 31; hydraulic lifting equipment 4; traction cable 41; hydraulic lifter 42; traction and flipping support 43; traction anchor seat 44; lifter fixing frame 45; anti-overturning device 5. Detailed implementation manners

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In the present invention, unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The following describes the present invention in detail with reference to the accompanying drawings and preferred embodiments. Without conflict, the following embodiments and the features in the embodiments can be mutually supplemented or combined.

[0048] As Figure 1 shown, the present invention provides a main tower top lifting system for installing the main tower 1 of a cable-stayed bridge. Specifically, the main tower top lifting system is used to lift or hoist one end of the main tower 1 horizontally placed on the ground, and make one end of the main tower 1 rotate around the other end until the main tower 1 rotates to the required non-horizontal position, so as to realize the rotation and installation of the main tower 1 on the cable-stayed bridge.

[0049] Referring to Figures 1 to 4 shown, the main tower top lifting system includes a hydraulic lifting device 2 and a main tower turning support 3. The main tower turning support 3 is rotatably connected to one end of the main tower 1, that is, the main tower 1 can rotate around the main tower turning support 3. The hydraulic lifting device 2 includes a hydraulic crawler 21, a support rod 22, and a lifting and turning support 23. One end of the support rod 22 is rotatably connected to the lifting and turning support 23, that is, the support rod 22 can rotate around the lifting and turning support 23. The other end of the support rod 22 away from the lifting and turning support 23 is connected to the other end of the main tower 1 away from the main tower turning support 3. The hydraulic crawler 21 is movably connected to the support rod 22 and can crawl along the extension direction of the support rod 22. When the hydraulic crawler 21 crawls towards the side away from the lifting and turning support 23, it can drive the other end of the main tower 1 to rotate around the main tower turning support 3, and after the main tower 1 rotates, it drives the support rod 22 to rotate around the lifting and turning support 23.

[0050] More specifically, referring to Figures 2 to 5As shown, before the hydraulic jacking device 2 jacks up the main tower 1, first place the main tower 1 on the main tower support 11 and position the main tower 1 on the horizontal ground (as shown by the solid line in Figure 2 and Figure 5 ). As the hydraulic crawler 21 crawls on the support rod 22 and gradually jacks up the main tower 1, the hydraulic crawler 21 can drive the main tower 1 to gradually rotate around the main tower turning support 3 (as shown by the dashed line in Figure 5 ). At this time, a turning angle α is formed between the position of the main tower 1 after rotation and the initial position of the main tower 1 (i.e., the horizontal position) (refer to Figure 3 ), and as the jacking height of the main tower 1 increases, the turning angle α of the main tower 1 gradually increases. When the main tower 1 is jacked up to a certain height, the horizontal distance between the main tower 1 and the jacking and turning support 23 (i.e., the distance between the other end of the main tower 1 away from the main tower turning support 3 and the jacking and turning support 23 in the horizontal direction) will gradually increase.

[0051] To ensure that the hydraulic crawler 21 can always jack up the main tower 1, during the jacking process of the main tower 1, the support rod 22 needs to freely rotate around the jacking and turning support 23 as the rotation angle of the main tower 1 changes. In this way, the main tower 1 can be flipped to any angle and the hydraulic crawler 21 can continue to jack up the main tower 1, greatly reducing the cost of auxiliary measures. At the same time, during the jacking and staying period of the main tower 1, the support rod 22, the main tower 1 and the horizontal ground form a stable triangular structure, which can effectively improve the operation safety and prevent the instantaneous fall of the main tower 1.

[0052] In the main tower top-lifting system provided by this application, there is no need to set up a high-position gantry or jack, thus being able to overcome the problems of too small turning angle α, insufficient traction arm and too large traction force when directly using the traction method to lift the main tower 1. The main tower top-lifting system provided by this application can make the main tower 1 rotate around the main tower turning support 3 by a certain angle through the crawling of the hydraulic crawler 21 on the support rod 22 and the rotation of the support rod 22, so as to gradually increase the turning angle α of the main tower 1. With such a setting, on the one hand, it can reduce the lifting difficulty of the main tower 1, improve the lifting efficiency of the main tower 1, and effectively improve the operation safety and reliability; on the other hand, it can greatly save the dosage and cost of auxiliary measures when lifting the main tower 1, reduce the floor area of the lifting equipment, and is especially suitable for the installation operation of the main tower in areas with narrow sites and complex terrains.

[0053] Further, the present application does not limit the flipping angle α that the main tower 1 can reach after being lifted by the hydraulic lifting device 2. In one example, when the weight of the main tower 1 is small and the height is low, the main tower 1 can be directly lifted to a predetermined installation angle (such as 90°) by the hydraulic lifting device 2. At this time, the flipping angle α of the main tower 1 is set to the predetermined installation angle. In this way, only the hydraulic lifting device 2 can be used to complete the installation of the main tower 1 at the predetermined angle, thereby realizing the rotation and installation operations of the main tower 1 in areas with narrow space and complex terrain.

[0054] Referring Figure 3 As shown, in another example, the flipping angle α of the main tower 1 can also be set to a specific value less than 90° (such as 10°, 20°, or 30°). At this time, the required flipping angle α after the main tower 1 rotates can be defined as the predetermined starting flipping angle. During the rotation and installation process of the main tower 1, the main tower 1 can be first rotated to the predetermined starting flipping angle by the hydraulic lifting device 2, and then the hydraulic lifting device 4 can be used to continue driving the main tower 1 to rotate until the installation of the main tower 1 in the vertical direction is completed.

[0055] In this embodiment, the support rod 22 and the lifting and flipping support 23 are connected by a pin shaft. In this way, the lifting and flipping support 23 can bear the loads of the support rod 22 in other directions except the rotation direction, so that the support rod 22 can only rotate around the lifting and flipping support 23 and cannot move relative to the lifting and flipping support 23. In addition, the main tower flipping support 3 and the main tower 1 are also connected by a pin shaft. In this way, the main tower flipping support 3 can bear the loads of the main tower 1 in other directions except the rotation direction, so that the main tower 1 can only rotate around the main tower flipping support 3 and also cannot move relative to the main tower flipping support 3.

[0056] The present application does not limit the material for preparing the support rod 22, and the support rod 22 can be prepared from a steel column or a steel pipe. The present application also does not limit the shape of the cross-section of the support rod 22, and the cross-sectional shape of the support rod 2 can be cylindrical or other regular and symmetric cross-sectional shapes.

[0057] Continuing to refer to Figure 2 As shown, the main tower top lifting system further includes a jacking support 24. The jacking support 24 is sleeved on the support rod 22 and is hinged to the other end of the main tower 1. The number of hydraulic crawlers 21 is multiple, and the jacking support 24 is connected to all the hydraulic crawlers 21. When each hydraulic crawler 21 crawls, it can drive the jacking support 24 to move on the support rod 22. After the jacking support 24 moves, it can drive the other end of the main tower 1 to rotate around the main tower flipping support 3. With such a configuration, by at least two hydraulic crawlers 21 crawling alternately on the support rod 22, the main tower 1 can be driven to rotate around the main tower flipping support 3, that is, the main tower 1 can be driven to rotate around the ground, so that the main tower 1 is lifted to the predetermined starting flipping angle or the main tower 1 is directly lifted to the predetermined installation angle.

[0058] Specifically, the hydraulic jacking device 2 can connect all the hydraulic crawlers 21 to each other by pushing against the support 24. Among them, a part of the hydraulic crawlers 21 can crawl on the support rod 22 and drive the support 24 to move. When this part of the hydraulic crawlers 21 crawls to the limit position, another part of the hydraulic crawlers 21 can continue to crawl on the support rod 22 and drive the support 24 to move, so as to realize the alternating crawling of all the hydraulic crawlers 21 on the support rod 22.

[0059] Refer to Figures 6 to 8 As shown, the hydraulic jacking device 2 further includes a slide rail 25. The slide rail 25 is arranged along the extension direction of the support rod 22 (i.e., the length direction of the support rod 22) and is fixedly connected to the support rod 22. The number of the slide rails 25 corresponds to the number of the hydraulic crawlers 21. One end of the hydraulic crawler 21 away from the support 24 is provided with a base 26, and the base 26 is slidably connected to a corresponding slide rail 25.

[0060] Furthermore, the hydraulic crawler 21 has an extended cylinder state and a retracted cylinder state. When the hydraulic crawler 21 is in the extended cylinder state, the base 26 can be locked to a corresponding slide rail 25, that is, the base 26 is connected to a corresponding slide rail 25 and cannot move relatively. At this time, the hydraulic crawler 21 can drive the support 24 to drive the other end of the main tower 1 to rotate. When the hydraulic crawler 21 is in the retracted cylinder state, the base 26 can be unlocked from a corresponding slide rail 25, that is, the base 26 can slide relative to the slide rail 25. At this time, the hydraulic crawler 21 can move on the support rod 22 following the support 24.

[0061] Refer to Figures 6 to 8 As shown, in an example, a guide plate 261 is provided on the base 26, and a guide groove 251 is provided on the slide rail 25. After the base 26 is installed on the slide rail 25, the guide plate 261 can be placed in the guide groove 251 to limit the moving direction of the hydraulic crawler 21 on the support rod 22. The guide plate 261 and the guide groove 251 can limit and guide the hydraulic crawler 21. With such a setting, when the support rod 22 rotates by a certain angle, the hydraulic crawler 21 can still continue to crawl in the extension direction of the support rod 22 to ensure that the hydraulic crawler 21 can still work reliably after tilting by a certain angle.

[0062] Continue to refer to Figure 6 and Figure 7As shown, the base 26 includes two symmetrically arranged clamping blocks 262. When the hydraulic crawler 21 is in the cylinder extending state, the two clamping blocks 262 of the base 26 can jointly clamp the slide rail 25 to achieve the locking of the base 26 and a corresponding slide rail 25. At the same time, the hydraulic crawler 21 can drive the jacking support 24 to drive one end of the main tower 1 to move away from the ground. When the hydraulic crawler 21 is in the cylinder retracting state, the two clamping blocks 262 of the base 26 of the hydraulic crawler 21 can automatically release the slide rail 25, that is, when the hydraulic crawler 21 retracts the cylinder without load and returns, the base 26 can automatically separate from the corresponding slide rail 25. At this time, the hydraulic crawler 21 is only connected to the jacking support 24 and can move along with the jacking support 24.

[0063] In this embodiment, the jacking and flipping support 23 is connected to the support rod 22 through the ear plate on the support rod 22. Four slide rails 25 are fixedly connected to the outer periphery of the support rod 22 in a uniformly distributed manner. The jacking support 24 is sleeved outside the support rod 22 and the slide rails 25 and is slidably connected to the support rod 22 and the slide rails 25.

[0064] See Figure 3 As shown, in a preferred embodiment, the main tower top lifting system further includes a main tower ear plate 31. The main tower ear plate 31 is fixedly connected to the other end of the main tower 1 and can be rotatably connected to the jacking support 24. With such a configuration, on the one hand, the connection between the jacking support 24 and the main tower 1 can be achieved through the main tower ear plate 31, and after the jacking support 24 moves, it can drive the main tower ear plate 31 to drive the main tower 1 to rotate. On the other hand, as the main tower 1 rotates, the included angle between the jacking support 24 and the main tower ear plate 31 can change accordingly to ensure that when the main tower 1 rotates to any angle, the jacking support 24 can always jack up the main tower 1.

[0065] Refer to Figures 9 to 11 As shown, the jacking support 24 includes a support body 241 and at least two upper ear plates 242. The support body 241 has a central hole 244, and the shape of the central hole 244 corresponds to the shape of the support rod 22 with the slide rail 25. The support body 241 is sleeved on the support rod 22 with the slide rail 25 to make the jacking support 24 and the slide rail 25 form a sliding connection. The jacking support 24 is arranged on the side of the hydraulic crawler 21 away from the jacking and flipping support 23, and all the upper ear plates 242 are arranged on the side of the jacking support 24 away from the hydraulic crawler 21. All the upper ear plates 242 are respectively connected to the main tower ear plate 31 and are symmetrically arranged along the central axis of the jacking support 24. The center lines of the pin holes of all the upper ear plates 242 are parallel to the rotation axis of the main tower flipping support 3, so as to achieve the consistency of the rotation direction of the main tower ear plate 31 and the rotation direction of the main tower 1.

[0066] In this embodiment, the jacking support 24 has a chute (not labeled) for accommodating the slide rail 25. After the jacking support 24 is sleeved on the support rod 22, the slide rail 25 can pass through the chute to limit and guide the sliding direction of the jacking support 24. Further, the number of upper ear plates 242 is two pairs, and each pair of upper ear plates 242 includes two upper ear plates 242 arranged in parallel. The two pairs of upper ear plates 242 are symmetrically arranged about the central axis of the jacking support 24.

[0067] Continue to refer to Figures 9 to 11 , the jacking support 24 further includes at least two lower ear plates 243. All the lower ear plates 243 are evenly arranged in the circumferential direction of the jacking support 24, and each lower ear plate 243 is connected to a corresponding hydraulic crawler 21. In this embodiment, all the lower ear plates 243 are arranged on the side of the jacking support 24 facing the hydraulic crawler 21, and the position of the lower ear plate 243 corresponds to the position of a corresponding slide rail 25, so as to ensure that the hydraulic crawler 21 always crawls on the slide rail 25.

[0068] In this embodiment, the number of hydraulic crawlers 21 is 4, and the 4 hydraulic crawlers 21 are symmetrically arranged about the support rod 22 (that is, the angle between adjacent hydraulic crawlers 21 is 90°). The number of lower ear plates 243 is 4 pairs, and each pair of lower ear plates 243 includes two lower ear plates 243 arranged in parallel. Among them, the center line of the pin hole of any one pair of lower ear plates 243 in the two pairs of lower ear plates 243 is parallel to the rotation axis of the main tower turning support 3, and the center line of the pin hole of any one pair of lower ear plates 243 in the other two pairs of lower ear plates 243 is perpendicular to the rotation axis of the main tower turning support 3. Each pair of lower ear plates 243 is connected to a corresponding hydraulic crawler 21, so as to realize the connection between the jacking support 24 and the 4 hydraulic crawlers 21. When the hydraulic crawler 21 works, the two pairs of symmetrically arranged lower ear plates 342 bear the same load at the same time and can drive the jacking support 24 and the main tower 1 to be jacked up. At this time, the loads borne by the two pairs of symmetrically arranged lower ear plates 243 in the horizontal direction can cancel each other out, so as to ensure that the support rod 22 only bears the force in the axial direction and does not bear the force in the circumferential or radial direction, so as to ensure that the support rod 22 can only rotate and cannot move.

[0069] Further, the present invention also provides a main tower top-lifting construction method. Using the main tower top-lifting system, the main tower top-lifting construction method includes the working steps of lifting the main tower, including:

[0070] The hydraulic crawler 21 includes a first group of hydraulic crawlers and a second group of hydraulic crawlers. The crawling process of the two groups of hydraulic crawlers 21 on the support rod 22 is as follows: all the hydraulic crawlers in the first group are in the cylinder extending state. At this time, the base 26 of each hydraulic crawler 21 in the first group can be locked with a corresponding slide rail 25, and when the first group of hydraulic crawlers 21 crawls on the support rod 22, it drives the main tower 1 to rotate around the main tower turning support 3. The second group of hydraulic crawlers can move along with one end of the main tower 2 away from the main tower turning support 3. At this time, the base 26 of each hydraulic crawler 21 in the second group is separated from the corresponding slide rail 25.

[0071] When all the hydraulic crawlers in the first group extend the cylinder to the limit position, all the hydraulic crawlers in the second group are in the cylinder extending state. At this time, the base 26 of each hydraulic crawler 21 in the second group can be locked with a corresponding slide rail 25, and when the second group of hydraulic crawlers crawls on the support rod 22, it continues to drive the main tower 1 to rotate around the main tower turning support 3. At the same time, all the hydraulic crawlers in the first group are in the cylinder retracting state. At this time, the first group of hydraulic crawlers can move along with one end of the main tower 1 away from the main tower turning support 3, and the base 26 of each hydraulic crawler 21 in the first group is separated from the corresponding slide rail 25. After all the hydraulic crawlers in the second group extend the cylinder to the limit position, all the hydraulic crawlers in the first group are again in the cylinder extending state to continue pushing the main tower 1 to rotate. In this way, the cycle is repeated, so that the first group of hydraulic crawlers and the second group of hydraulic crawlers alternately crawl on the support rod 22 and continuously drive the main tower 1 to rotate until the main tower 1 is lifted to the predetermined starting angle or the predetermined installation angle.

[0072] It should be explained that when the first group of hydraulic crawlers extend the cylinder to the limit position, the second group of hydraulic crawlers should first be changed to the cylinder extending state so that the base 26 of each hydraulic crawler 21 in the second group can be locked with the corresponding slide rail 25, and then all the hydraulic crawlers in the first group are in the cylinder retracting state, and the base 26 of each hydraulic crawler 21 in the first group is separated from the slide rail 25. In this way, it can be ensured that in any case, the base 26 of a group of hydraulic crawlers is locked with the slide rail 25, thus preventing the bases 26 of all the hydraulic crawlers 21 from being separated from the slide rail 25 and causing the instantaneous fall of the hydraulic crawlers 21 and the jacking support 24.

[0073] In this embodiment, the 4 hydraulic crawlers 21 are divided into two groups, and each group of hydraulic crawlers 21 includes two relatively arranged hydraulic crawlers 21. By alternately making the two groups of hydraulic crawlers 21 in the cylinder extending state and the cylinder retracting state, the continuous movement of the jacking support 24 can be realized and the main tower 1 can be driven to rotate until the main tower 1 is rotated to the predetermined starting angle or the predetermined installation angle.

[0074] In a specific embodiment, after starting the hydraulic jacking device 2, a set of hydraulic crawlers 21 can be in the cylinder extending state, and the other set of hydraulic crawlers 21 follows the jacking support 24 to rise. In another specific embodiment, when the main tower 1 is heavy and it is difficult to start the jacking, after starting the hydraulic jacking device 2, both sets of hydraulic crawlers 21 can be in the cylinder extending state. At this time, when both sets of hydraulic crawlers 21 extend the cylinder to the limit position, one set of hydraulic crawlers 21 can be first in the cylinder retracting state. After this set of hydraulic crawlers 21 retracts the cylinder to the limit position, then this set of hydraulic crawlers 21 is in the cylinder extending state, and at the same time, the other set of hydraulic crawlers 21 is in the cylinder retracting state, so as to realize the alternating extension and retraction of the two sets of hydraulic crawlers 21, thereby realizing the gradual jacking of the jacking support 24 driving the main tower 1, so as to meet the jacking and rotation requirements of the main tower 1 in the initial state.

[0075] In a preferred embodiment, the main tower top lifting system further includes a hydraulic lifting device 4. The hydraulic lifting device 4 is connected to the other end of the main tower 1 away from the main tower turning support 3. The hydraulic lifting device 4 and the hydraulic jacking device 2 are arranged on opposite sides of the main tower 1. Under the jacking of the hydraulic jacking device 2, the main tower 1 has a turning angle α after rotation. The hydraulic lifting device 4 is used to continue driving the other end of the main tower 1 to rotate around the main tower turning support 3 after the turning angle α of the main tower 1 reaches the predetermined starting turning angle.

[0076] In another preferred construction method for lifting the main tower, when the main tower 1 rotates to the predetermined starting turning angle under the jacking of the hydraulic jacking device 2, the hydraulic lifting device 4 can continue to drive the other end of the main tower 1 to rotate around the main tower turning support 3 until the main tower 1 is turned to the predetermined installation angle.

[0077] It should be noted that in the prior art, a jack is used to jack up the main tower 1 so that the main tower 1 has a certain turning angle α. However, since the jack can only jack up the main tower 1 within a limited height, that is, the jack can only make the main tower 1 have a small turning angle α, and the maximum turning angle α that the main tower 1 can reach is always less than the predetermined starting turning angle. At this time, when the hydraulic lifting device 4 continues to lift the main tower 1, the hydraulic lifting device 4 requires a large traction force to continue to lift the main tower 1, which has high requirements for the hydraulic lifting device 4. In this embodiment, the main tower 1 is rotated by a combination of the hydraulic jacking device 2 for jacking and the hydraulic lifting device 4 for lifting, so that the main tower 1 is rotated to the predetermined starting turning angle by the jacking of the hydraulic jacking device 2, and then the main tower 1 can be directly lifted in place by the hydraulic lifting device 4. In this way, the traction force required by the hydraulic lifting device 4 can be greatly reduced, the lifting cost of the hydraulic lifting device 4 can be reduced, and the operation efficiency can be improved.

[0078] See Figure 2 and Figure 12As shown in the figure, the hydraulic lifting device 4 includes a traction cable 41 and a hydraulic lifter 42. One end of the traction cable 41 is connected to the main tower 1, preferably connected to the main tower ear plate 31, and the other end is connected to the hydraulic lifter 42. The hydraulic lifter 42 can gradually tighten the traction cable 41 to drive the other end of the main tower 1 to rotate around the main tower turning support 3. As the traction cable 41 is gradually tightened, that is, the length of the traction cable 41 is gradually reduced, the distance from the end of the traction cable 41 connected to the main tower ear plate 31 to the hydraulic lifter 42 gradually decreases. In this way, a traction force can be provided to the main tower ear plate 31 through the traction cable 41, so that the other end of the main tower 1 continues to rotate around the main tower turning support 3 under the pull of the traction cable 41.

[0079] It should be noted that when the hydraulic jacking device 2 gradually jacks up the main tower 1, the hydraulic lifter 42 synchronously tightens the traction cable 41, so that during the jacking process of the main tower 1, the traction cable 41 is always in a tensioned state. When the main tower 1 is jacked up to the predetermined starting angle (as shown by the solid line in Figure 12 ), the hydraulic jacking device 2 withdraws from work and is removed, and the hydraulic lifter 42 continues to tighten the traction cable 41 to provide a traction force for the other end of the main tower 1 to continue rotating through the traction cable 41, and the main tower 1 continues to rotate around the main tower turning support 3 (as shown by the dotted line in Figure 12 ) until the main tower is rotated to the predetermined installation angle.

[0080] In a preferred embodiment, the hydraulic lifting device 4 further includes a traction turning support 43, a traction anchor seat 44 and a lifter fixing frame 45. The traction turning support 43 is placed on the foundation ground, and the traction cable 41 is connected to the main tower 1 through the traction anchor seat 44. The lifter fixing frame 45 is rotatably connected to the traction turning support 43, and the hydraulic lifter 42 is installed in the lifter fixing frame 45. After the hydraulic lifting device 4 drives the main tower 1 to rotate, the lifter fixing frame 45 can rotate around the traction anchor seat 44 so that the traction cable 41 cannot be bent during the lifting process.

[0081] See Figure 4 As shown in the figure, the main tower 1 is an axisymmetric structure, and the symmetry axis of the main tower 1 is perpendicular to the rotation axis of the main tower turning support 3.

[0082] In a relatively preferred embodiment, the number of the hydraulic lifting devices 4 and the hydraulic jacking devices 2 are both multiple, and the multiple hydraulic lifting devices 4 are symmetrically arranged with respect to the symmetry axis of the main tower 1. With such an arrangement, on the one hand, the main tower can be jacked up and lifted by the multiple hydraulic jacking devices 2 and the multiple hydraulic lifting devices 4, so that the jacking force applied by each hydraulic jacking device 2 and the lifting force applied by each hydraulic lifting device 4 can be reduced, thereby improving the local stress of the main tower 1 structure.

[0083] In a preferred embodiment, the position of each hydraulic lifting device 4 corresponds to the position of a hydraulic jacking device 2. That is to say, the main tower top lifting system has multiple support rods 22 and multiple groups of traction cables 41, and the position of each group of traction cables 41 corresponds to the position of a support rod 22. Among them, each group of traction cables 41 may include one or more traction cables 41. In another preferred embodiment, different numbers of hydraulic lifting devices 4 and hydraulic jacking devices 2 can be set. At this time, the position of each hydraulic lifting device 4 cannot correspond one-to-one with the position of the hydraulic jacking device 2.

[0084] Referring to Figure 13 and Figure 14 shown, the main tower top lifting system further includes an anti-tipping device 5. The anti-tipping device 5 is connected to the other end of the main tower 1 and is used to prevent the main tower 1 from rotating by more than 90 0 degrees and causing tipping. The anti-tipping device 5 and the hydraulic jacking device 2 are arranged on the same side of the main tower 1.

[0085] The structure of the anti-tipping device 5 is not limited in this application. The anti-tipping device 5 can be a steel strand that passes through the main tower 1 and is installed on both sides of the main tower 1 for stretching. Referring to Figure 13 shown, in this embodiment, both the anti-tipping device 5 and the hydraulic jacking device 2 are arranged on the same side of the main tower 1. The anti-tipping device 5 has the same structure as the hydraulic lifting device 4. That is, the anti-tipping device 5 has a cable, a hoist, a support, an anchor base, and a fixing frame. Among them, the anchor base is connected to the main tower ear plate 31. One end of the cable is connected to the anchor base, and the other end is connected to the hoist. The hoist is arranged in the fixing frame, and the fixing frame is rotatably connected to the support arranged on the horizontal plane. If the main tower 1 rotates around the main tower turning support 3 by more than 90°, the cable of the anti-tipping device 5 can provide traction force for the main tower ear plate 31 to prevent the main tower 1 from suddenly falling in the direction opposite to the initial position.

[0086] In a non-limiting embodiment, the working process of the hydraulic lifting device includes the following stages:

[0087] 1) Initial installation stage

[0088] During the initial installation, the main tower 1 is assembled on the bridge deck and placed in a horizontal position. One end of the main tower 1 is hinged to the main tower flip support 3 on the ground through the ear plate, and the other end is welded to the main tower ear plate 31. The slide rail 25 is fixedly connected to the support rod 22 in advance, and the jacking support 24 is inserted into the support rod 22 provided with the slide rail 25. The jacking flip support 23 is fixedly set on the bridge deck or foundation in the area near the main tower 1, and the support rod 22 of the hydraulic jacking equipment 2 is hinged to the jacking flip support 23. The upper ear plate 242 of the jacking support 24 is hinged to the main tower ear plate 31, and one end of the hydraulic crawler 21 is hinged to the lower ear plate 243 of the jacking support 24. The base 26 is installed on the slide rail 25, and the guide plate 261 is placed in the guide groove 251 of the slide rail 25, so that the guide plate 261 and the guide groove 251 form a one-way sliding connection, and the installation of the hydraulic jacking equipment 2 is completed.

[0089] Then install the traction anchor seat 44 at the other end of the main tower 1 away from the main tower flip support 3, install the traction flip support 43 on the other side of the ground away from the hydraulic jacking device 2, and hinge the lifter fixing frame 45 with the traction flip support 43, and install the hydraulic lifter 42 in the lifter fixing frame 45. Connect one end of the traction cable 41 to the traction anchor seat 44, and the other end to the hydraulic lifter 42, and evenly tension the traction cable 41. Connect the hydraulic crawler 21 and the hydraulic lifter 42 to the hydraulic system, and connect the communication and computer control equipment at the same time, and complete the initial installation after debugging.

[0090] 2) Load lifting stage

[0091] Start the hydraulic lifting system, so that the first group of hydraulic crawlers symmetrically arranged at 180° on the support rod 22 is in the extended cylinder state, and the clamping block 262 of the base 26 corresponding to the hydraulic crawler 21 in the extended cylinder state is locked with the slide rail 25. The hydraulic crawler 21 pushes the jacking support 24 to move up along the support rod 22, and the support rod 22 rotates around the jacking flip support 23, so that the end of the main tower 1 away from the main tower flip support 3 is lifted and rotated. At this time, the second group of hydraulic crawlers arranged at 90° on the support rod 22 moves up with the jacking support 24, and the base 26 corresponding to the second group of hydraulic crawlers is not locked with the slide rail 25. When the first group of hydraulic crawlers extends the cylinder to the limit position, the second group of hydraulic crawlers begins to change to the extended cylinder state, and continues to push the jacking support 24 to move up along the support rod 22, thereby driving the end of the main tower 1 to continue to lift and rotate. At this time, the first group of hydraulic crawlers is in the retracted cylinder state (that is, the first group of hydraulic crawlers return to retract the cylinder). When the second group of hydraulic crawlers 21 extends the cylinder to the limit position, the first group of hydraulic crawlers has returned to retract the cylinder to the limit position. At this time, the first group of hydraulic crawlers is transformed into the extended cylinder state again, and then the second group of hydraulic crawlers is transformed into the retracted cylinder state to start the next cycle. This is repeated many times, and the end of the main tower 1 can be continuously lifted and rotated to the predetermined starting angle. In the process of lifting and rotating the main tower 1, as the rotation angle of the main tower 1 increases, the hydraulic lifter 42 in the hydraulic lifting device 4 needs to continuously tighten the traction cable 41 so that the traction cable 41 is always in a tensioned state.

[0092] 3) Load lifting stage

[0093] When the main tower 1 is lifted to the predetermined lifting angle, the hydraulic lifting device 4 at the other end of the main tower 1 starts to work. At this time, the hydraulic lifter 42 drives the traction cable 41 and the traction anchor seat 44 at its tail end to move under a certain pressure, so that the main tower 1 that has reached the predetermined lifting angle is in a traction force balance state under the traction force of the hydraulic lifter 42. Then the hydraulic lifter 42 gradually rotates the main tower 1 to the predetermined installation angle, thereby completing the installation of the main tower 1. In the process of the hydraulic lifter 42 lifting the main tower 1, all the loads of the hydraulic crawlers 21 are transferred. At this time, the hydraulic crawlers 21 are all retracted to the extreme position and the load is completely released. In this process, a crane can be used to assist in the removal of the hydraulic lifting device 2 to make the hydraulic lifting device 2 stop working.

[0094] After the main tower 1 reaches the installation angle, the hydraulic lifter 42 is mechanically locked, and then the reserved steel plate at the position of the main tower flip support 3 is completed. After the prestressed cables are installed and pre-tensioned on both sides of the main tower 1, the hydraulic lifting device 4 is unloaded, and the hydraulic lifting device 4 and auxiliary components such as the connecting ear plates are removed by a crane. At this point, the installation of the main tower 1 is completed.

[0095] If the predetermined installation angle of the main tower 1 is close to 90°, an anti-tipping device 5 needs to be pre-installed on the main tower 1, or a single-sided cable of the bridge needs to be pre-installed on the main tower 1 and tightened in cooperation to prevent the main tower 1 from tipping over transiently during the rotation process and causing a safety accident.

[0096] In another non-limiting embodiment, the main tower 1 can be directly lifted to the predetermined installation angle by only the hydraulic jacking device 2, and the main tower 1 will no longer use the hydraulic lifting device 4 to tow the main tower 1 subsequently. At this time, the anti-tipping device 5 can be arranged on the side of the main tower 1 facing the hydraulic jacking device 2 to be used as a safety protection device for the main tower 1, and at the same time, the hydraulic jacking device 2 and the anti-tipping device 5 can be used together to limit the rotation angle of the main tower 1.

[0097] In summary, in the main tower top-lifting system and the main tower top-lifting construction method provided by the present invention, the main tower top-lifting system does not need to be provided with a high-position gantry or a jack, which greatly saves the usage and cost of auxiliary measures, effectively reduces the lifting difficulty and safety risk of the main tower 1, and greatly improves the lifting efficiency of the main tower 1. At the same time, the main tower top-lifting system has a small floor area and is particularly suitable for the installation operation of the main tower 1 in areas with narrow space and complex terrain.

[0098] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A main tower lifting system for flipping the main tower of a cable-stayed bridge, characterized in that, It includes a hydraulic jacking device and a main tower tipping support; the main tower tipping support is rotatably connected to one end of the main tower; the hydraulic jacking device includes a hydraulic crawler, a support rod, and a jacking and tipping support; one end of the support rod is rotatably connected to the jacking and tipping support; the other end of the support rod far from the jacking and tipping support is connected to the other end of the main tower far from the main tower tipping support; the hydraulic crawler is movably connected to the support rod and can crawl along the extending direction of the support rod; when the hydraulic crawler crawls towards the side away from the jacking and tipping support, it can drive the other end of the main tower to rotate around the main tower tipping support, and after the main tower rotates, it drives the support rod to rotate around the jacking and tipping support.

2. The main tower top lifting system according to claim 1, characterized in that, It further includes a pushing support, the pushing support is sleeved on the support rod and is hinged to the other end of the main tower; the number of the hydraulic crawlers is multiple, and the pushing support is connected to all the hydraulic crawlers; when each hydraulic crawler crawls, it can drive the pushing support to move on the support rod, and after the pushing support moves, it can drive the other end of the main tower to rotate around the main tower tipping support.

3. The main tower top lifting system according to claim 2, characterized in that, The hydraulic jacking device further includes a slide rail, the slide rail is arranged along the extending direction of the support rod and is fixedly connected to the support rod; the number of the slide rails corresponds to the number of the hydraulic crawlers, a base is arranged at the end of the hydraulic crawler far from the pushing support, and the base is slidably connected to a corresponding slide rail. The hydraulic crawler has an extended cylinder state and a retracted cylinder state; when the hydraulic crawler is in the extended cylinder state, the base can be locked to a corresponding slide rail, and the hydraulic crawler can drive the pushing support to drive the other end of the main tower to rotate; when the hydraulic crawler is in the retracted cylinder state, the base can be unlocked from a corresponding slide rail, and the hydraulic crawler can move on the support rod following the pushing support.

4. The main tower top lifting system according to claim 3, wherein A guide plate is arranged on the base, and a guide groove is arranged on the slide rail; after the base is installed on the slide rail, the guide plate can be placed in the guide groove to define the moving direction of the hydraulic crawler on the support rod.

5. The main tower top lifting system according to claim 2, wherein The multiple hydraulic crawlers are uniformly arranged in the circumferential direction of the support rod.

6. The main tower top lifting system according to claim 3, characterized in that It further includes a main tower ear plate, the main tower ear plate is fixedly connected to the other end of the main tower and can be rotatably connected to the pushing support; after the pushing support moves, it can drive the main tower to rotate through the main tower ear plate.

7. The main tower top lifting system according to claim 6, characterized in that, The pushing support includes a support body and at least two upper ear plates, the support body is sleeved on the support rod with the slide rail, the pushing support is arranged on the side of the hydraulic crawler far from the jacking and tipping support; all the upper ear plates are arranged on the side of the pushing support far from the hydraulic crawler; all the upper ear plates are respectively connected to the main tower ear plate, and the center lines of the pin holes of all the upper ear plates are parallel to the rotation axis of the main tower tipping support.

8. The main tower top lifting system according to claim 7, characterized in that, The jacking bearing further includes at least two lower ear plates, and all the lower ear plates are evenly arranged in the circumferential direction of the jacking bearing. Each lower ear plate is connected to a corresponding hydraulic crawler.

9. The main tower top lifting system according to any one of claims 1-8, characterized in that, It further includes a hydraulic lifting device, which is connected to the other end of the main tower away from the main tower turning bearing. The hydraulic lifting device and the hydraulic jacking device are arranged on opposite sides of the main tower. Under the jacking of the hydraulic jacking device, the main tower has a turning angle after rotation. The hydraulic lifting device is used to continue driving the other end of the main tower to rotate around the main tower turning bearing after the turning angle of the main tower reaches a predetermined starting angle.

10. The main tower top lifting system according to claim 9, characterized in that, The hydraulic lifting device includes a traction cable and a hydraulic lifter; one end of the traction cable is connected to the main tower, and the other end is connected to the hydraulic lifter; the hydraulic lifter can gradually tighten the traction cable to drive the other end of the main tower to rotate around the main tower turning bearing.

11. The main tower top lifting system according to claim 10, characterized in that, The hydraulic lifting device further includes a traction anchor seat, a lifter fixing frame, and a traction turning bearing. The traction cable is connected to the main tower through the traction anchor seat; the lifter fixing frame is rotatably connected to the traction turning bearing, and the hydraulic lifter is installed in the lifter fixing frame. After the hydraulic lifting device drives the main tower to rotate, the lifter fixing frame can rotate around the traction anchor seat so that the traction cable cannot be bent during the lifting process.

12. The main tower top lifting system according to claim 10, characterized in that, The main tower is an axisymmetric structure, and the axis of symmetry of the main tower is perpendicular to the axis of rotation of the main tower turning bearing.

13. The main tower top lifting system according to claim 12, wherein, The number of the hydraulic lifting devices and the hydraulic jacking devices is multiple, and the multiple hydraulic lifting devices are symmetrically arranged with respect to the axis of symmetry of the main tower.

14. The main tower top lifting system according to claim 1, characterized in that, It further includes an anti-tipping device, which is connected to the other end of the main tower and is used to prevent the main tower from tipping over due to the rotation angle exceeding 90°; the anti-tipping device and the hydraulic jacking device are arranged on the same side of the main tower.

15. A construction method for lifting the main tower top, which adopts the main tower top lifting system described in any one of claims 1-14, and is characterized in that, It includes the working steps of jacking and lifting the main tower, including: The hydraulic crawler includes a first group of hydraulic crawlers and a second group of hydraulic crawlers. The first group of hydraulic crawlers are all in the cylinder extending state. When the first group of hydraulic crawlers crawl on the support rod, they drive the main tower to rotate around the main tower turning bearing, and the second group of hydraulic crawlers move along with the end of the main tower away from the main tower turning bearing. When the first group of hydraulic crawlers all extend the cylinder to the limit position, the second group of hydraulic crawlers are all in the cylinder extending state, the first group of hydraulic crawlers are all in the cylinder retracting state. When the second group of hydraulic crawlers crawl on the support rod, they continue to drive the main tower to rotate around the main tower turning bearing, and the first group of hydraulic crawlers move along with the end of the main tower away from the main tower turning bearing, so that the first group of hydraulic crawlers and the second group of hydraulic crawlers alternately crawl on the support rod and continuously drive the main tower to rotate.

16. The main tower top lifting construction method according to claim 15, characterized in that, The main tower top lifting system further includes a hydraulic lifting device, which is connected to the other end of the main tower away from the main tower turning support, and the hydraulic lifting device and the hydraulic jacking device are arranged on opposite sides of the main tower; When the main tower rotates to a predetermined starting angle under the jacking of the hydraulic jacking device, the hydraulic lifting device can continue to drive the other end of the main tower to rotate around the main tower turning support until the main tower is turned to a predetermined installation angle.

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