Balancing mechanism matched with swing system of extremely unbalanced structure and application thereof

Abstract

The present application belongs to the field of swivel bridge construction, and relates to a balancing mechanism matched with a swivel system of an extremely unbalanced structure and application of the balancing mechanism in swivel bridge construction. The balancing mechanism comprises connecting ropes, connecting devices, counterforce frames, and jacks that apply tension to the connecting ropes. The jacks are controlled to start and stop and / or adjust the tension value according to the comparison result of the real-time tension value measured by a force measuring element and a preset tension value. The sector angle of the sector ring-shaped counterforce frame is adapted to the preset swivel angle of the swivel system. The counterforce frame is concentrically arranged inside and / or outside the lower swivel disc slide and is fixed to the lower bearing platform at the lower part. The upper and lower ends of the connecting ropes are fixed to the jacks and the connecting devices. The connecting devices are slidingly and / or rollingly assembled with the upper part of the counterforce frame. The present application solves the problems of limited counterweight space and low balancing accuracy in the prior art, realizes dynamic and accurate balancing during the swivel process, adapts to complex swivel angle requirements, and has good construction safety, efficiency and economy, and is suitable for construction of various extremely unbalanced swivel bridges.

Description

Technical Field

[0001] This invention belongs to the field of construction technology for swing bridges, specifically relating to a balancing mechanism and its application that is compatible with a swing system for an extremely unbalanced structure. Background Technology

[0002] Swing bridge construction is a highly efficient bridge erection method. After the main bridge structure is cast in a precast yard, it is horizontally rotated using support devices such as ball joints or sliding tracks, allowing the bridge to be precisely positioned on the design axis. This method is particularly suitable for bridge projects spanning complex terrains such as railways, highways, and rivers. It features a short construction period, minimal disruption to the surrounding environment, and high construction safety, and has been widely used in numerous bridge projects both domestically and internationally.

[0003] With the rapid development of transportation infrastructure, bridge spans are constantly increasing and structural forms are becoming more complex, leading to the growing application of highly unbalanced swing bridges. Highly unbalanced swing bridges typically experience unbalanced moments on both sides of the rotation point that significantly exceed the control range of conventional swing bridges due to structural asymmetry (such as a significant difference in length between long and short cantilever arms) and uneven weight distribution (such as lateral eccentricity in wide bridges or weight differences between the inner and outer sides of curved bridges). Traditional balance control methods for such bridges primarily rely on loading counterweights (such as sandbags or concrete blocks) onto the short cantilever side, but this approach has several problems: First, the space available for counterweights on the short cantilever side is often very limited, requiring the use of high-density counterweight materials, which not only increases construction difficulty and cost but may also lead to excessive stress on the counterweight area. Second, traditional counterweight methods have low precision, making it difficult to adapt to the dynamic changes in unbalanced moments during rotation in real time, easily causing rotation jamming, accelerated wear of ball joints, and even structural instability and other safety accidents.

[0004] To solve the above construction difficulties, some improved solutions have been proposed in the prior art. For example, the document "Jack Tensioning and Counter-Pressing Technology for Cast-in-suit 0# Block on T-Structure Bracket of Swivel Bridge on Expressway" discloses a jack tensioning and counter-pressing technology, which pre-presses the cast-in-situ 0# block on the T-structure bracket by means of reverse tensioning with jacks and steel strands, so as to achieve the effect of replacing the traditional stack preloading, and solve the safety risk and construction period cost problems of high-altitude stack loading. However, this technical solution still has obvious defects: first, its application scenario is limited to the bracket preloading stage, aiming to eliminate the elastic and inelastic deformation of the support, and it does not involve the dynamic balance control during the swivel process, so it cannot solve the core problem of real-time change of unbalanced moment of the extremely unbalanced swivel bridge during the rotation process; second, this technology does not provide a reaction force support structure adapted to the swivel angle, and only provides reaction force through a simple anchoring system, which cannot meet the requirement of synchronous rotation of the beam body during the swivel process; third, it lacks an intelligent control mechanism, cannot realize precise adjustment and stable load holding of the tension force, and is difficult to adapt to the strict requirements of extremely unbalanced swivel bridges for balance accuracy; fourth, the reaction force transmission path design of this technology is only for static preloading, without considering the influence of frictional resistance during the swivel process, and cannot ensure the stability of the swivel process.

[0005] Therefore, it is urgent to develop a system and construction method specially suitable for the swivel of extremely unbalanced structures, which can realize dynamic and precise balance control during the swivel process, adapt to the requirements of swivel angles, solve the defects existing in traditional counterweighting and existing related technologies, and ensure the safety, stability and efficiency of the construction of extremely unbalanced swivel bridges. Contents of the Invention

[0006] The purpose of the present invention is to provide a balance mechanism matched with the swivel system of an extremely unbalanced structure and the application thereof, which can effectively monitor the real-time change of the unbalanced moment during the rotation process of the extremely unbalanced swivel bridge, control the precise application of the tension force according to the comparison result between the measured value and the set value, and effectively ensure the stable operation and precise control during the swivel process.

[0007] The overall technical concept of the present invention is as follows: The balance mechanism matched with the swivel system of the extremely unbalanced structure is used to apply a balance moment to the extremely unbalanced swivel structure to offset the unbalanced moment during the swivel process; it comprises a connecting cable, a connecting device, and a reaction frame. A jack applies tension force to the connecting cable driven by a hydraulic station, a force measuring element measures the tension force value of the connecting cable in real time, and a control device realizes start-stop control of the jack and / or adjusts the change of the tension force value according to the comparison result between the measured tension force value and the preset tension value; the reaction frame is a fan-ring structure, the fan angle of which is adapted to the preset swivel angle of the swivel system, the reaction frame is concentrically arranged on the inner side and / or the outer side of the lower turntable slideway of the swivel system, and the lower part thereof is fixed to the lower bearing platform; the working end of the jack is connected with the upper end of the connecting cable, the lower end of the connecting cable is fixed with the connecting device, and the connecting device is assembled with the upper part of the reaction frame in a guiding sliding and / or rolling manner.

[0008] Application of a balancing mechanism matched with a swivel system with an extremely unbalanced structure in the construction of swivel bridges.

[0009] The specific technical concept of the present invention further includes: To facilitate the connection between the working end of the jack and the upper end of the connecting cable, a preferred technical implementation means is that the jack adopts a center-hole jack, and the working end of the jack is connected with the upper end of the connecting cable through an anchorage device and clips.

[0010] The main function of the guiding sliding and / or rolling assembly between the connecting device and the upper part of the reaction frame is to facilitate flexible cooperation and smooth operation of components during the swivel process. A preferred technical implementation means is that wear-resistant sliding plates and / or rolling elements are provided at the adjacent position between the connecting device and the upper part of the reaction frame.

[0011] The main function of the force measuring element is to measure the tension value of the connecting cable, and the force measuring element selects a force sensor and / or a dynamometer with a tension or pressure measurement function. These include, but are not limited to, strain gauge type tension sensors, hydraulic tension sensors, magnetoelastic tension sensors, pressure sensors, etc., all without departing from the essence of the present invention. The assembly position of the tension sensor, pressure sensor or dynamometer shall meet the requirements of force transmission path and measurement accuracy. The core assembly positions include: first, the connection node between the jack and the connecting cable, for example, installed at the force output end of the jack, or outside the anchorage device and clips, as well as the joint part between the jack and the bridge deck, that is, the "first transmission point" where the jack applies tension; second, the anchorage end of the connecting cable; third, the fixed end of the connecting cable on the reaction frame side, that is, the connection part between the connecting cable and the connecting device, or the reserved sensor installation interface on the reaction frame; fourth, the intermediate force-bearing section of the connecting cable, for example, a tension sensor or dynamometer is fixed on the intermediate body of the connecting cable through a special fixture, and a "straight section far from bends and free of wear" is preferentially selected; fifth, the liquid working medium output end of the hydraulic station.

[0012] To ensure that the connecting cable has good tensile strength, yield strength, elongation at break and elastic modulus to meet the need of counteracting the unbalanced moment during the swivel process, a preferred technical implementation means is that the connecting cable is a high-strength steel wire rope or steel strand.

[0013] The main function of the reaction frame is to provide stable reaction force support and swivel guidance for the balancing mechanism, including providing reverse acting force, ensuring full-process adaptation of the swivel, and dispersing forces to protect the structure. To facilitate the fixation of the lower part of the reaction frame to the lower bearing platform, a preferred technical implementation means is that the lower part of the reaction frame is fixed to the lower bearing platform by embedding or anchoring.

[0014] To facilitate the control of the action of the center-hole jack by the control device, a preferred technical implementation means is that the control device is electrically connected to the control end of the hydraulic station, and the control device controls the start and stop of the jack and / or adjusts the change of the tension value through the hydraulic station.

[0015] In order for the through-center jack, connecting cables and connecting devices to meet the requirements of the balance mechanism, a preferred technical implementation means is that the number of jacks, connecting cables and connecting devices is adapted to the unbalanced moment value of the extremely unbalanced structure.

[0016] In order for the reaction frame to better meet the operation requirements with the swivel system, a preferred technical implementation means is that the sector angle of the reaction frame ranges from 30° to 180°, and can be adjusted according to the swivel angle requirement.

[0017] The application of the balance mechanism matched with the swivel system of the extremely unbalanced structure in the construction of swivel bridges includes the following steps: A. Determine the sector angle of the reaction frame, the preset tension value, and the layout scheme of the jacks and connecting cables according to the T-structure design of the swivel bridge and the preset swivel angle. B. During the pouring process of the lower bearing platform, fix the lower part of the reaction frame at the preset position of the lower bearing platform. C. Arrange jacks and anchors at the preset positions of the swivel bridge, fasten and connect the connecting cables with the working ends of the jacks and the connecting devices through the anchors and clips, assemble the connecting devices with the reaction frame, install the force measuring elements, connect the control device, the hydraulic station and the jacks, and complete the installation of the balance mechanism. D. Use supports for support during the construction of the superstructure of the swivel bridge. Before removing the supports, control the posture of the swivel bridge structure through the balance system to prevent overturning after the supports are removed. Use the balance mechanism to assist conventional means for weighing, and accurately calculate the unbalanced moment. E. Lay backing plates under the support feet close to the balance mechanism to reduce the clearance of the support feet and prevent the structure from tilting. F. The control device drives the jacks to tension the connecting cables through the hydraulic station, applying a preset tension force to the swivel bridge in the direction opposite to the direction of the unbalanced moment. G. The force measuring elements monitor the tension value of the connecting cables in real time. According to the comparison result between the measured tension value and the preset tension value, the control device realizes start-stop control of the jacks and / or adjusts the change of the tension value through the hydraulic station, and starts the swivel operation after the connecting cables are stably holding the load. H. After the swivel bridge is rotated into place, the structure is permanently consolidated, and the balance mechanism is dismantled.

[0018] In order to facilitate the operation of the weighing test, a preferred technical implementation means is that in step D, a pressure sensor or a weighing sensor array is used to carry out the weighing test to obtain the weight distribution data of the swivel bridge, and then calculate the unbalanced moment.

[0019] In order to facilitate the setting of the preset tension value and meet the safety requirement of the set value, the preset tension value in step F does not exceed the ratio of the unbalanced moment to the moment arm, and the eccentricity is controlled to be no more than 15 cm.

[0020] To facilitate the adjustment of the prestress of the jack, the preferred technical means is that the force measuring element in step G monitors the tension value in real time. When the tension value fluctuates beyond the preset range of ±3%, the control device controls the start and stop of the jack and / or adjusts the change of the tension value through the hydraulic station to maintain the stability of the load on the connecting cable.

[0021] The essential features and significant technical advancements of this invention are as follows: 1. Precisely adapts to the requirements of extremely unbalanced rotation: Through the reaction frame design of the fan-shaped structure, its fan angle is precisely matched with the rotation angle, ensuring that the connecting cables can always obtain effective reaction force support during the rotation process, solving the problem that traditional reaction structures cannot adapt to the rotation angle; combined with the closed-loop control of the intelligent control system, the tension can be precisely adjusted (accuracy up to ±1%), which can compensate for the dynamic changes of unbalanced torque in real time, effectively control the unbalanced torque during the rotation process, avoid risks such as rotation jamming and ball joint wear, and significantly improve the safety and stability of the construction of extremely unbalanced rotating bridges.

[0022] 2. Breaking through spatial limitations and expanding the scope of application: By adopting "tension balancing" instead of the traditional "stacking counterweight", there is no need to stack a large amount of counterweight material on the short cantilever side. This effectively solves the technical problem of limited counterweight space on the short cantilever side of the extremely unbalanced swing bridge. It can be applied to complex extremely unbalanced swing structures with large differences in cantilever length and severe lateral eccentricity, thus expanding the application scenarios of swing technology.

[0023] 3. Improve construction efficiency and reduce costs: The components of the balancing mechanism can be prefabricated and installed on site; the intelligent control system automates the application, holding, and adjustment of tension without manual intervention, significantly shortening the balancing and debugging time (saving more than 60% of the construction period compared to the traditional counterweight method); the connecting cables, jacks and other components can be reused, reducing material consumption and construction costs; at the same time, it avoids high-altitude stacking operations, reducing safety risks and environmental pressure.

[0024] 4. Optimize stress performance and extend equipment life: Wear-resistant sliding plates or rolling elements are set between the connecting device and the reaction frame, which greatly reduces the frictional resistance during the rotation process (the friction coefficient is reduced to below 0.05), reduces energy loss and component wear, and extends the service life of core equipment such as ball joints and slides; The reaction frame is firmly connected to the lower bearing platform to form an integrated stress system, ensuring uniform force transmission and avoiding structural damage caused by local stress concentration.

[0025] 5. Dynamic balance control, adaptable to complex working conditions: The tension value is monitored in real time by the force measuring element control device. Based on the comparison between the measured value and the preset value, the control device controls the start and stop of the jack and / or adjusts the tension value through the hydraulic station. It can adapt to the unbalanced torque fluctuation caused by structural deformation, environmental load (such as wind load) and other factors during the rotation process, and realize dynamic balance control. Compared with the existing static preloading technology, it can better meet the construction needs of complex working conditions of extremely unbalanced rotating bridges. Attached Figure Description

[0026] The accompanying drawings of this invention include: Figure 1 This is a schematic elevation view of the rotating system of the present invention used in an extremely unbalanced structure.

[0027] Figure 2 for Figure 1 AA view.

[0028] Figure 3 A schematic diagram of the end face structure for connecting the device and the reaction frame using sliding friction.

[0029] Figure 4 A schematic diagram of the end face structure for connecting the device and the reaction frame using rolling friction.

[0030] Figure 5 This is a schematic diagram of the force measuring element installed at the anchor end of the connecting cable.

[0031] Figure 6 This is a schematic diagram of the structure in which the force measuring element is installed in the middle body of the connecting cable.

[0032] The reference numerals in the attached figures are as follows: 1. Central support; 2. Lower turntable slide; 3. Support legs; 4. Temporary sand box; 5. Jack; 6. Connecting cable; 7. Anchor; 8. Clamping plate; 9. Connecting cable; 10. Connecting device; 11. Reaction frame; 12. Wear-resistant sliding plate; 13. Rolling element; 14. Lower bearing platform; 15. Force measuring element. Detailed Implementation

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but this is not intended to limit the present invention. The scope of protection of the present invention shall be determined by the content of the claims. Any equivalent technical means substitutions made in accordance with the specification shall not depart from the essence of the present invention.

[0034] The overall structure of this embodiment is as shown in the figure, which is a balance mechanism matched with a swivel system of extremely unbalanced structure, configured to apply a balance moment to the extremely unbalanced swivel structure to offset the unbalanced moment during the swivel process; the swivel system includes a support mechanism and the balance mechanism, and the support mechanism includes a central support 1, a lower turntable slideway 2, a support foot 3, a temporary sand box 4 and a lower bearing platform 14, wherein the central support 1, as the core of the swivel system, bears the main weight of the upper structure; the support foot 3, as the "safety leg" of the support mechanism, can effectively prevent the upper structure from excessive vertical deflection during the swivel process, and avoid the occurrence of rollover accidents; the lower turntable slideway 2 is located below the support foot 3, providing a flat walking track for swivel construction; the temporary sand box 4 plays an auxiliary support role in the pouring stage; the lower bearing platform 14 provides a foundation for the arrangement of the central support 1, the lower turntable slideway 2 and the temporary sand box 4. Since the support mechanism pertains to mature prior art, the applicant will not elaborate on its detailed structure and working process herein.

[0035] The balance mechanism includes a connecting cable 6, a connecting device 10, and a reaction frame 11. A jack 6 driven by a hydraulic station applies a tensile force to the connecting cable 6, the jack 5 is selected as a hollow jack, the working end of the jack 5 is connected to the upper end of the connecting cable 6 through an anchorage device 7 and a clip 8, the lower end of the connecting cable 6 is fixed to the connecting device 10, the adjacent position between the connecting device 10 and the upper part of the reaction frame 11 is assembled in a guiding sliding and / or rolling manner through a wear-resistant sliding plate 12 and / or a rolling element 13, a force measuring element 15 measures the tensile force value of the connecting cable 6 in real time, and the control device realizes start-stop control of the jack 5 and / or adjusts the change of the tensile force value according to the comparison result between the measured tensile force value and the preset tensile force value; the reaction frame 11 is of a sector ring structure, the sector angle of which is adapted to the preset swivel angle of the swivel system, the reaction frame 11 is concentrically arranged on the inner side and / or the outer side of the lower turntable slideway 2 of the support mechanism, and the lower part thereof is fixed to the lower bearing platform 14; as shown in Figure 3 , 4 .

[0036] The force measuring element 15 adopts a strain gauge type tension sensor, a hydraulic type tension sensor, a magnetoelastic type tension sensor or a dynamometer, etc. When the force measuring element 15 adopts a strain gauge type tension sensor, a hydraulic type tension sensor, or a magnetoelastic type tension sensor, it is installed at the anchoring end of the connecting cable 6, specifically as shown in Figure 5 , when a tension sensor or a dynamometer is used, it is fixed on the middle body of the connecting cable 6 through a special fixture, specifically as shown in Figure 6 , the connecting cable 6 is a high-strength steel wire rope or a steel strand.

[0037] The lower part of the reaction frame 11 is fixed to the lower bearing platform 14 by embedding or anchoring.

[0038] The control device is electrically connected to the control end of the hydraulic station, and controls the start-stop and / or tension value output of the jack 5 through the hydraulic station.

[0039] The quantities of the jack 5, the connecting cables 6 and the connecting devices 10 are adapted to the unbalanced moment value of the extremely unbalanced structure.

[0040] The sector angle of the reaction frame 11 ranges from 30° to 180°, and can be adjusted according to the requirements of the swivel angle.

[0041] The application of the balancing mechanism matched with the swivel system of the extremely unbalanced structure in the construction of swivel bridges comprises the following steps: A. Determine the sector angle of the reaction frame 11, the preset tension value, and the layout scheme of the jack 5 and the connecting cables 6 according to the T-structure design of the swivel bridge and the preset swivel angle; B. During the pouring process of the lower bearing platform 14, fix the lower part of the reaction frame 11 at the preset position of the lower bearing platform 14; C. Arrange the jack 5 and the anchor 7 at the preset positions of the swivel bridge, fasten and connect the connecting cables 6 with the working end of the jack 5 and the connecting device 10 through the anchor 7 and the clamping piece 8, assemble the connecting device 10 with the reaction frame 11, install the force measuring element, connect the control device, the hydraulic station and the jack 5, and complete the installation of the balancing mechanism; D. Use supports to support the superstructure of the swivel bridge during construction. Before removing the supports, control the posture of the swivel bridge structure through the balancing system to prevent overturning after the supports are removed, use the balancing mechanism to assist conventional means in weighing, and accurately calculate the unbalanced moment; E. Lay backing plates under the support feet close to the balancing mechanism to reduce the gaps of the support feet and prevent the structure from tilting; F. The control device drives the jack 5 to tension the connecting cables 6 through the hydraulic station, applying a preset tension force to the swivel bridge in the direction opposite to the unbalanced moment; G. The force measuring element monitors the tension value of the connecting cables 6 in real time. According to the comparison result between the measured tension value and the preset tension value, the control device realizes the start-stop control of the jack 5 and / or adjusts the change of the tension value through the hydraulic station, and starts the swivel operation after the connecting cables 6 maintain a stable load; H. After the swivel bridge is rotated into place, the structure is permanently consolidated, and the balancing mechanism is removed.

[0042] In step D, a pressure sensor or a load cell array is used to carry out a weighing test to obtain the weight distribution data of the swivel bridge, and then calculate the unbalanced moment.

[0043] In step F, the preset tension value does not exceed the ratio of the unbalanced moment to the force arm, and the eccentricity is controlled to be no more than 15 cm.

[0044] In step G, the force measuring element monitors the tension value in real time. When the fluctuation of the tension value exceeds the preset range of ±3%, the control device controls the start and stop of the jack 5 and / or adjusts the change of the tension value through the hydraulic station to maintain the stable load holding of the connecting cables 6.

Claims

1. A balance mechanism matched with a swivel system of an extremely unbalanced structure, configured to apply a balance moment to the extremely unbalanced swivel structure to counteract the unbalanced moment during the swivel process, characterized in that The system includes a connecting cable (6), a connecting device (10), and a reaction frame (11). A jack (5), driven by a hydraulic station, applies tension to the connecting cable (6). A force measuring element (15) measures the tension value of the connecting cable (6) in real time. The control device, based on the comparison between the measured tension value and the preset tension value, controls the start / stop of the jack (5) and / or adjusts the tension value. The reaction frame (11) has a fan-shaped ring structure, and the fan angle is adapted to the preset rotation angle of the rotation system. The force frame (11) is concentrically located inside and / or outside the lower turntable slide (2) of the rotating system and its lower part is fixed to the lower support (14); the working end of the jack (5) is connected to the upper end of the connecting cable (6), the lower end of the connecting cable (6) is fixed to the connecting device (10), the connecting device (10) is guided to slide and / or roll on the upper part of the reaction frame (11), and wear-resistant sliding plate (12) and / or rolling body (13) are provided at the upper adjacent part of the connecting device (10) and the reaction frame (11).

2. The balancing mechanism for a rotating system with a highly unbalanced structure as described in claim 1, characterized in that... The jack (5) is a through-hole jack, and the working end of the jack (5) is connected to the upper end of the connecting cable (6) through the anchor (7) and the clamp (8).

3. The balancing mechanism for a rotating system with a highly unbalanced structure as described in claim 1, characterized in that... The force measuring element (15) is selected from force sensors and / or force gauges with tensile force measurement function.

4. The balancing mechanism for a rotating system with a highly unbalanced structure as described in claim 1, characterized in that... The connecting cable (6) is a high-strength steel wire rope or steel strand.

5. The balancing mechanism for a rotating system with a highly unbalanced structure as described in claim 1, characterized in that... The lower part of the reaction frame (11) is fixed to the lower bearing platform (14) by pre-embedding or anchoring.

6. The balancing mechanism for a rotating system with an extremely unbalanced structure according to claim 1 or 2, characterized in that... The control device is electrically connected to the control terminal of the hydraulic station. The control device controls the start and stop of the jack (5) and / or adjusts the change of the tension value through the hydraulic station.

7. The balancing mechanism for a rotating system with a highly unbalanced structure according to claim 1 or 2, characterized in that... The number of jacks (5), connecting cables (6) and connecting devices (10) is matched to the unbalanced torque value of the extremely unbalanced structure.

8. The balancing mechanism for a rotating system with a highly unbalanced structure as described in claim 1, characterized in that... The fan angle of the reaction frame (11) ranges from 30° to 180° and can be adjusted according to the rotation angle requirements.

9. The application of the balance mechanism matched with the extremely unbalanced structure rotation system according to any one of claims 1 to 8 in the construction of a swivel bridge, characterized in that Includes the following steps: A. Based on the T-structure design and preset rotation angle of the swing bridge, determine the sector angle of the reaction frame (11), the preset tension value, and the arrangement scheme of the jacks (5) and connecting cables (6); B. During the pouring of the lower foundation (14), the lower part of the reaction frame (11) is fixed to the preset position of the lower foundation (14); C. Arrange jacks (5) and anchors (7) at the preset positions of the swing bridge, and fasten the connecting cable (6) to the working end of the jack (5) and the connecting device (10) through the anchor (7) and the clamp (8). Assemble the connecting device (10) with the reaction frame (11), assemble the force measuring element, connect the control device, hydraulic station and jack (5) to complete the installation of the balancing mechanism. D. When constructing the upper structure of the swing bridge, a support frame is used. Before removing the support frame, the attitude of the swing bridge structure is controlled by a balancing system to prevent it from overturning after the support frame is removed. A balancing mechanism is used to assist conventional methods of weighing and to accurately calculate the unbalanced moment. E. Lay pads under the support legs near the balancing mechanism to reduce the gap between the support legs and prevent the structure from tilting. F. The control device drives the jack (5) through the hydraulic station to tension the connecting cable (6) and apply a preset tension force opposite to the direction of the unbalanced torque to the rotating bridge; G. The force measuring element monitors the tension value of the connecting cable (6) in real time. Based on the comparison between the measured tension value and the preset tension value, the control device controls the start and stop of the jack (5) and / or adjusts the change of the tension value through the hydraulic station. When the connecting cable (6) is stably loaded, the rotation operation is started. H. After the swing bridge is rotated into place, the structure is permanently fixed and the balancing mechanism is removed.

10. The application according to claim 9, characterized in that... In step D, a weighing experiment is conducted using a pressure sensor or a weighing sensor array to obtain the weight distribution data of the rotating bridge, and then the unbalanced torque is calculated.

11. The application according to claim 9, characterized in that... In step F, the preset tension value does not exceed the ratio of the unbalanced torque to the lever arm, and the eccentricity is controlled to be no greater than 15cm.

12. The application according to claim 9, characterized in that... In step G, the force measuring element monitors the tension value in real time. When the tension value fluctuates beyond the preset range of ±3%, the control device controls the start and stop of the jack (5) and / or adjusts the change of the tension value through the hydraulic station to maintain the stability of the load on the connecting cable (6).

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