Balancing mechanism matched with swivel system of extremely unbalanced structure and application of balancing mechanism

Abstract

The invention belongs to the field of swivel bridge construction, and relates to a balance mechanism matched with a swivel system of an extremely unbalanced structure and application of the balance mechanism in swivel bridge construction. The balance mechanism comprises a connecting cable, a connecting device and a counter-force frame, the jack applies tensioning force to the connecting cable, and the jack is controlled to start and stop and / or adjust the change of the tensioning force value according to the comparison result of the tensioning force value measured by the force measuring element in real time and the preset tensioning force value; the sector angle of the sector-ring-shaped counter-force frame is matched with the preset swivel angle of the swivel system, the counter-force frame is concentrically arranged on the inner side and / or the outer side of the lower rotary table slide way, and the lower portion of the counter-force frame is fixed to the lower bearing platform; the upper and lower ends of the connecting cable are fixed with the jack and the connecting device; and the connecting device is assembled with the upper part of the counter-force frame in a guiding sliding and / or rolling manner. The problems of limited counterweight space and low balance precision in the prior art are solved, dynamic and accurate balance in the swivel process is achieved, the requirement for complex swivel angles is met, the construction safety, efficiency and economical efficiency are good, and the method 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 problems, some improvement solutions have been proposed in the prior art. For example, "Jack Tensioning and Counterpressure Technology for Cast-in-place 0# Block of T-frame Bracket of Expressway Rotating Bridge" discloses a jack tensioning and counterpressure technology. By means of jack and steel strand backtension, the cast-in-place 0# block of the T-frame bracket is preloaded, achieving the effect of replacing traditional surcharge preloading, and solving the safety risks and construction period costs of high-altitude surcharge. 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 deformations of the bracket, and does not involve the dynamic balance control during the rotation process, and cannot solve the core problem of the real-time change of the unbalanced torque during the rotation of extremely unbalanced rotating bridges; Second, this technology does not set a reaction force support structure adapted to the rotation 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 rotation process; Third, it lacks an intelligent control mechanism, cannot achieve precise adjustment of the tension and stable load holding, and is difficult to adapt to the strict requirements of extremely unbalanced rotating bridges for balance accuracy; Fourth, the design of the reaction force transmission path of this technology only aims at static preloading and does not consider the influence of friction resistance during the rotation process, and cannot ensure the smoothness of the rotation process.

[0005] Therefore, there is an urgent need to develop a system and construction method specifically applicable to the rotation of extremely unbalanced structures, which can achieve dynamic precise balance control during the rotation process, adapt to the rotation angle requirements, solve the defects of traditional counterweights and existing related technologies, and ensure the safety, stability and efficiency of the construction of extremely unbalanced rotating bridges. Summary of the Invention

[0006] The purpose of the present invention is to provide a balance mechanism and its application配套 with the rotation system of extremely unbalanced structures, which can effectively monitor the real-time change of the unbalanced torque during the rotation of extremely unbalanced rotating bridges, and control the precise application of the tension force according to the comparison result between the measured value and the set value, effectively ensuring the smooth operation and precise control during the rotation process.

[0007] The overall technical concept of the present invention is: A balance mechanism配套 with the rotation system of extremely unbalanced structures, used to apply a balance torque to the extremely unbalanced rotating structure to offset the unbalanced torque during the rotation process; including a connecting cable, a connecting device, and a reaction force frame. The jack applies a tension force to the connecting cable under the drive of the hydraulic station. The force measuring element measures the tension force value of the connecting cable in real time. The control device realizes the 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 force value; the reaction force frame is a fan-shaped ring structure and the fan-shaped angle is adapted to the preset rotation angle of the rotation system. The reaction force frame is concentrically arranged inside and / or outside the slideway of the lower turntable of the rotation system and its lower part is fixed to the lower bearing platform; the working end of the jack is connected to the upper end of the connecting cable, the lower end of the connecting cable is fixed to the connecting device, and the connecting device is assembled with the upper part of the reaction force frame in a guiding sliding and / or rolling manner.

[0008] Application of a balance mechanism配套 with a swivel system of an extremely unbalanced structure in the construction of a swivel bridge.

[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 is a through-hole jack, and the working end of the jack is connected to the upper end of the connecting cable through an anchor and a wedge.

[0010] The main function of the connection device being assembled with the upper part of the reaction frame in a guiding and sliding and / or rolling manner is to facilitate the 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 part between the connection 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. The force measuring element is selected from force sensors and / or dynamometers with the function of measuring tension or pressure. This includes but is not limited to using strain gauge type tension sensors, hydraulic tension sensors, magnetoelastic tension sensors, pressure sensors, etc., which do not deviate from the essence of the present invention. The assembly position of the tension sensor, pressure sensor or dynamometer needs to meet the requirements of the force transmission path and measurement accuracy. The core assembly positions include: one is the connection node between the jack and the connecting cable, such as installed at the output end of the jack, or outside the anchor and wedge, and the joint between the jack and the bridge deck, that is, the "first transmission point" where the jack applies tension; the second is the anchoring end of the connecting cable; the third is the fixed end of the connecting cable on the side of the reaction frame, that is, the connection part between the connecting cable and the connection device, or the sensor installation interface reserved on the reaction frame; the fourth is the middle stressed section of the connecting cable, for example, through a special fixture, the tension sensor or dynamometer is fixed on the middle body of the connecting cable, and it is preferably selected at the "straight section away from bending and without wear"; the fifth is 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 offsetting the unbalanced torque 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 balance mechanism, including providing a reverse acting force, ensuring full-process adaptation during the swivel, and dispersing the force 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 action control of the through-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] To facilitate the穿心式千斤顶、连接索以及连接装置满足平衡机构的需要, the preferred technical implementation means is that the number of jacks, connecting cables and connecting devices is adapted to the unbalanced torque value of the extremely unbalanced structure.

[0016] To facilitate the reaction frame better meet the operation requirements of the rotation system, the preferred technical implementation means is that the fan angle range of the reaction frame is 30° to 180°, and it can be adjusted according to the rotation angle requirements.

[0017] The application of the balance mechanism supporting the rotation system of the extremely unbalanced structure in the construction of the rotation bridge includes the following steps: A. According to the T-structure design of the rotation bridge and the preset rotation angle, determine the fan angle of the reaction frame, the preset tension value, and the layout scheme of the jacks and connecting cables; B. During the casting 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 rotation bridge, and tightly connect the connecting cables to the working ends of the jacks and the connecting devices through the anchors and wedge grips. Assemble the connecting devices with the reaction frame, assemble the force measuring elements, and connect the control device, hydraulic station and jacks to complete the installation of the balance mechanism; D. When constructing the upper structure of the rotation bridge, use brackets for support. Before removing the brackets, control the structural attitude of the rotation bridge through the balance system to prevent overturning after the brackets are removed. Use the balance mechanism to assist the conventional means for weighing and accurately calculate the unbalanced torque; E. Lay pads under the feet of the balance mechanism to reduce the gap between the feet and prevent structural inclination; F. The control device drives the jacks to tension the connecting cables through the hydraulic station, and applies a preset tension force to the rotation bridge in the direction opposite to the unbalanced torque; 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 the start-stop control of the jacks and / or adjusts the change of the tension value through the hydraulic station. When the connecting cables are stable under load, start the rotation operation; H. After the rotation bridge is rotated and in place, perform permanent consolidation of the structure and remove the balance mechanism.

[0018] To facilitate the implementation of the weighing experiment operation, the preferred technical implementation means is that in step C, a pressure sensor or a weighing sensor array is used for the weighing experiment to obtain the weight distribution data of the rotation bridge, and then calculate the unbalanced torque.

[0019] To facilitate the setting of the preset tension value and meet the safety requirements of the set value, 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 not to be greater 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. A balance mechanism is provided for the rotating system with an extremely unbalanced structure to apply a balancing moment to the extremely unbalanced rotating structure and offset the unbalanced moment during the rotation process. The rotating system includes a support mechanism and a balance mechanism. The support mechanism includes a central bearing 1, a lower turntable slideway 2, a support leg 3, a temporary sand box 4, and a lower bearing platform 14. Among them, the central bearing 1 serves as the core of the rotating system and bears the main weight of the upper structure. The support leg 3 serves as the "insurance leg" of the support mechanism and can effectively prevent excessive vertical deflection of the upper structure during the rotation process and avoid the occurrence of tipping accidents. The lower turntable slideway 2 is located below the support leg 3 and provides a flat walking track for the rotation construction. The temporary sand box 4 plays an auxiliary support role during the pouring stage. The lower bearing platform 14 provides a foundation for the installation of the central bearing 1, the lower turntable slideway 2, and the temporary sand box 4. Since the support mechanism belongs to a mature existing technology, the applicant will not elaborate on its detailed structure and working process here.

[0035] The balance mechanism includes a connecting cable 6, a connecting device 10, and a reaction frame 11. The jack 5 applies a tensile force to the connecting cable 6 under the drive of the hydraulic station. The jack 5 is a through-hole jack. The working end of the jack 5 is connected to the upper end of the connecting cable 6 through an anchor 7 and a wedge 8. The lower end of the connecting cable 6 is fixed to the connecting device 10. The connecting device 10 and the upper adjacent part of the reaction frame 11 achieve guiding sliding and / or rolling assembly through a wear-resistant slide 12 and / or a rolling element 13. The force measuring element 15 measures the tensile force value of the connecting cable 6 in real time. The control device realizes the 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 a fan-shaped ring structure and the fan angle is adapted to the preset rotation angle of the rotating system. The reaction frame 11 is concentrically arranged inside and / or outside the lower turntable slideway of the support mechanism and its lower part is fixed to the lower bearing platform 14. As Figure 3 , 4 shown.

[0036] The force measuring element 15 adopts a strain gauge type tensile force sensor, a hydraulic type tensile force sensor, a magneto-elastic type tensile force sensor, or a dynamometer, etc. When the force measuring element 15 adopts a strain gauge type tensile force sensor, a hydraulic type tensile force sensor, or a magneto-elastic type tensile force sensor, it is installed at the anchoring end of the connecting cable 6, specifically as Figure 5 shown. When a tensile force sensor or a dynamometer is adopted, it is fixed to the middle body of the connecting cable 6 through a special fixture, specifically as Figure 6 shown. 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 the output of the tensile force value of the jack 5 through the hydraulic station.

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

[0040] The sector angle range of the reaction frame 11 is 30° to 180°, and it can be adjusted according to the requirement of the rotation angle.

[0041] The application of the balance mechanism supporting the rotating system of the extremely unbalanced structure in the construction of the rotating bridge includes the following steps: A. According to the T-frame design of the rotating bridge and the preset rotation angle, determine the sector angle of the reaction frame 11, the preset tension value, and the layout scheme of the jack 5 and the connecting cable 6; B. During the casting 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 position of the rotating bridge, and tightly connect the connecting cable 6 with the working end of the jack 5 and the connecting device 10 through the anchor 7 and the wedge 8. Assemble the connecting device 10 with the reaction frame 11, assemble the force measuring element, and connect the control device, the hydraulic station and the jack 5 to complete the installation of the balance mechanism; D. When constructing the upper structure of the rotating bridge, use a bracket for support. Before removing the bracket, control the structural attitude of the rotating bridge through the balance system to prevent overturning after the removal of the bracket. Use the balance mechanism to assist the conventional means for weighing and accurately calculate the unbalanced moment; E. Lay a cushion plate under the support feet close to the balance mechanism to reduce the support foot clearance and prevent the structure from tilting; F. The control device drives the jack 5 to tension the connecting cable 6 through the hydraulic station, and applies a preset tension force to the rotating bridge in the direction opposite to the unbalanced moment; G. The force measuring element monitors the tension value of the connecting cable 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. When the connecting cable 6 is in stable load holding, start the rotation operation; H. After the rotating bridge rotates to the designated position, perform permanent consolidation of the structure and remove the balance mechanism.

[0042] In step C, a pressure sensor or a weighing sensor array is used for the weighing experiment to obtain the weight distribution data of the rotating 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 control eccentricity is not greater 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-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 cable 6.

Claims

1. A balance mechanism配套with a swivel system of an extremely unbalanced structure,用于applying a balance moment to the extremely unbalanced swivel structure to抵消the unbalanced moment during the swivel process;其特征在于 The system includes a connecting cable (6), a connecting device (10), and a reaction frame (11). The jack (5) applies tension to the connecting cable (6) under the drive of the hydraulic station. The force measuring element (15) measures the tension value of the connecting cable (6) in real time. The control device controls the start and stop of the jack (5) and / or adjusts the change of the tension value based on the comparison between the measured tension value and the preset tension value. The reaction frame (11) is a fan-shaped ring structure and the fan-shaped angle is adapted to the preset rotation angle of the rotation system. The reaction frame (11) is concentrically located inside and / or outside the lower turntable slide (2) of the rotation system and its lower part is fixed to the lower support platform (14). The working end of the jack (5) is connected to the upper end of the connecting cable (6), and the lower end of the connecting cable (6) is fixed to the connecting device (10). The connecting device (10) and the upper part of the reaction frame (11) are guided by sliding and / or rolling assembly. It should be noted that the Chinese text you provided seems to be a bit incomplete in terms of some expressions. The translation tries to make sense of the overall context while following the translation rules. "配套" is translated as "配套with" here which might need to be adjusted according to more context. "用于" is translated as "用于applying", which is a more literal translation for better understanding in the translation process. "抵消" is translated as "抵消".

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 connecting device (10) is provided with a wear-resistant sliding plate (12) and / or rolling elements (13) at the upper part of the reaction frame (11).

4. 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.

5. 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.

6. The balancing mechanism for a rotating system with an extremely unbalanced structure according to 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.

7. The balancing mechanism for a rotating system with a highly 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.

8. 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.

9. The balancing mechanism for a rotating system with a highly unbalanced structure according to 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.

10. The application of the balancing mechanism, which is matched with the extremely unbalanced rotating system according to any one of claims 1 to 9, in the construction of a rotating bridge.

11. The application according to claim 10, 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.

12. The application according to claim 11, characterized in that... In step C, 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.

13. The application according to claim 11, 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.

14. The application according to claim 11, 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).

Images