Intelligent adjusting device and method for unbalanced cable force of middle tower main cable of multi-tower suspension bridge

Abstract

The invention discloses an intelligent adjusting device and method for unbalanced cable force of a middle tower main cable of a multi-tower suspension bridge, and the device comprises an intelligent jack, a pull rod, a main cable locking hoop and a tower top embedded part, which form a stable tension applying system. According to the device, the intelligent jack is adopted as a core component for tension application, reverse tension can be accurately applied, the intelligent jack is installed on the tower top through the tower top embedded part, and the reverse tension generated by the intelligent jack is stably transmitted to the main cable through the pull rod and the main cable locking hoop; unbalanced loads generated in the main beam hoisting process are effectively balanced, relative sliding between a main cable and a cable saddle is avoided, the device is provided with an advanced sensing and control system, the tension can be monitored and adjusted in real time, and accuracy and safety in the construction process are ensured. The device is simple in structure, convenient to operate and suitable for the construction process of the multi-tower suspension bridge, and has important significance for improving the safety and efficiency of bridge construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of suspension bridge construction, and more specifically, relates to an intelligent adjustment device and method for unbalanced cable force of a main cable in a tower of a multi-tower suspension bridge. Background Art

[0002] Compared with the traditional two-tower suspension bridge, the spanning capacity of the multi-tower suspension bridge has been significantly improved. By adding an intermediate tower, the multi-tower suspension bridge can achieve continuous ultra-long spans, which is suitable for terrain conditions such as wide waters, deep valleys, and sandbanks or islands in the middle of rivers. At the same time, the multi-tower structural design reduces the span of the bridge and reduces the deadweight of the upper structure. It is widely used in bridge construction projects. For existing multi-tower suspension bridges, especially small and medium-span suspension bridges, due to the small weight of the main cable, the vertical load acting on the saddle is small. During the main beam hoisting process, when the main beams of the two adjacent main spans are hoisted asymmetrically, due to the difference in cable force, a large unbalanced force will be generated at the top of the tower due to the difference in cable force, resulting in a sliding force at the saddle at the top of the tower that is greater than the friction between the main cable and the saddle, thereby causing relative sliding between the main cable and the saddle, which has a huge impact on the construction of the upper structure and causes safety hazards. The research on the anti-slip of the saddle in the prior art is mainly solved by the following solutions: 1. Improve the anti-slip coefficient of the saddle and enhance the anti-slip ability. However, since the friction coefficient cannot be increased infinitely, there is still a risk of sliding when the ratio of the self-weight of the first beam to the self-weight of the main cable is large; 2. The symmetry of load application during the process of hanging beams on both sides is strictly controlled through absolute symmetrical construction, which requires high coordination of on-site communications and operators, and it is difficult to achieve load synchronization when the span is large. In recent years, some researchers have proposed new technical solutions, such as the patent document with authorization number CN112376422B, which provides a self-balancing system for the main cable force of a suspension bridge, including: a saddle mechanism, including a saddle, a roller and a main cable, the saddle is arranged on the roller, the main cable is arranged on the saddle, and the saddle can slide along the direction of the main cable; a limiting mechanism, including a first limiting block and a second limiting block; a braking mechanism including a brake, and the first side and the second side of the saddle are respectively provided with corresponding brakes. The present invention respectively arranges a first limit stop and a second limit stop at both ends of the saddle, so that the saddle is positioned between the first limit stop and the second limit stop and moves on the roller, thereby adjusting the unbalanced force generated by the main cable; and by arranging a brake, the brake has a braking effect on the saddle, preventing the saddle from sliding under the influence of external factors, thereby improving the self-balancing adjustment effect of the saddle main cable and improving the safety of the cable tower. Another example is the patent document with publication number CN117626822A, which discloses a device and method for reducing the unbalanced horizontal force during the process of lifting the beam of the middle tower of a multi-tower suspension bridge. The middle tower is used as the balance demarcation point. On the other side of the first beam to be lifted, a traction adjustment steel strand is set. One end of the adjustment steel strand is connected to the main cable on the small mileage side that bears the weight of the first beam to be lifted through a temporary locking clamp, and the other end is connected to the anchor device on the side tower on the large mileage side. The adjustment steel strand is in a horizontal direction, and the adjustment steel strand is pulled away from the small mileage side by a tensioning device to balance the horizontal force generated by the main cable on the small mileage side at the cable saddle when the first beam is lifted, which indirectly suppresses the relative sliding between the cable strand and the saddle groove. However, the device in the prior art is not highly intelligent, which affects the construction accuracy, and the device is complex to install and difficult to adjust during the unbalanced force adjustment process, which reduces the construction efficiency. Summary of the invention

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides an intelligent adjustment device and method for the unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge. The present invention applies reverse tension to the main cable through a stable tension application system composed of an intelligent jack, a pull rod, a main cable locking clamp and tower top embedded parts, thereby effectively balancing the unbalanced load generated during the main beam hoisting process, avoiding relative sliding between the main cable and the saddle, and reducing construction risks.

[0004] In order to achieve the above object, according to one aspect of the present invention, the present invention provides an intelligent adjustment device for unbalanced cable force of a main cable in a tower of a multi-tower suspension bridge, comprising:

[0005] The intelligent jack is installed on the top of the tower through the embedded parts on the top of the tower, and is used to apply the pre-tensioning load in advance to adjust the unbalanced load generated during the main beam lifting process;

[0006] The main cable locking clamp is firmly clamped on the main cable as the key point of tension transmission;

[0007] A pull rod, one end of which is connected to the intelligent jack, and the other end of which is connected to the main cable locking clamp to form a stable pre-tensioning load application system;

[0008] High-precision sensors are arranged at key positions of the device to monitor the changes in the cable force on the pull rod and environmental conditions in real time. The smart jack dynamically adjusts the pre-tensioning load according to the changes and transmits the tension to the main cable through the pull rod and the main cable locking clamp.

[0009] Furthermore, the intelligent jack includes a jack bracket and a jack top body fixed inside the jack bracket.

[0010] Furthermore, the intelligent jack is equipped with an advanced monitoring and control system for real-time monitoring and adjustment of the applied pre-tensioning load.

[0011] Furthermore, the intelligent jack has an automatic compensation function and can maintain a constant tension output when environmental conditions change.

[0012] Furthermore, the main cable locking clamp comprises a main cable clamp locked on the main cable by high-strength bolts, and the end of the main cable clamp is connected to a conversion device for changing the force transmission direction through a clamp pin.

[0013] Furthermore, the main cable locking clamp also includes a pull rod connector having one end connected to the pull rod, and the other end of the connector is connected to the conversion device via the clamp pin.

[0014] Furthermore, the pull rod is made of a high-strength material with sufficient strength and rigidity.

[0015] According to another aspect of the present invention, the present invention provides a method for adjusting the unbalanced cable force of the main cable in the middle tower of a multi-tower suspension bridge, which is implemented by using the above-mentioned intelligent adjustment device for the unbalanced cable force of the main cable in the middle tower of a multi-tower suspension bridge, and is characterized by comprising the following specific steps:

[0016] S100: Install the device on the middle tower and main cable of a multi-tower suspension bridge with pre-installed main beams, and calculate the pre-tension load in advance;

[0017] S200: Before the main beam is hoisted, the prestressing load is applied according to the calculated prestressing load using the intelligent jack. During the entire application process, the applied load is continuously monitored using a high-precision monitoring system;

[0018] S300: hoisting the first main beam, during which the tension changes of the pull rods are detected by sensors, and the load applied is appropriately adjusted by intelligent jacks;

[0019] S400: hoisting another main span beam section, and during the installation of the suspension rod, the intelligent jack is slowly unloaded to gradually release part or all of the tension previously applied;

[0020] S500: Hoist the subsequent beam sections and continue with the above steps, i.e. calculate the pre-tension load, apply the appropriate tension, monitor the load changes, and make adjustments if necessary, until the friction force at the saddle exceeds the unbalanced load.

[0021] Furthermore, in step S100, the pre-tension load is determined by calculating the unbalanced load and the maximum friction force.

[0022] Furthermore, it also includes step S600: unloading the smart jack. After complete unloading, first loosen the pull rod, remove the pull rod connector and place it on the catwalk, then remove the pull rod from the smart jack, and finally remove the smart jack and the main cable locking clamp separately, and use a tower crane to lift and transport the pull rod, smart jack, main cable locking clamp and accessories.

[0023] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0024] 1. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge of the present invention adopts an intelligent jack as a core component, which can accurately apply reverse tension. It is installed on the top of the tower through the tower top embedded parts, and transmits the tension to the main cable through the pull rod and the main cable locking clamp, effectively balancing the unbalanced load generated during the main beam hoisting process, avoiding the relative sliding between the main cable and the saddle, and no balanced loading is required for the hoisting of the main beam between two adjacent spans, thereby reducing the construction difficulty and risk.

[0025] 2. The intelligent adjustment device for unbalanced cable force of the main cable of the multi-tower suspension bridge of the present invention is equipped with advanced high-precision sensors, which can monitor the changes of cable force on the pull rod and environmental conditions in real time, ensure that each lifting is carried out within a controllable range, and adjust the pre-tensioning force applied by the intelligent jack according to the changes, ensuring that the sliding force at the cable saddle is always smaller than the friction force, thereby improving the accuracy of construction.

[0026] 3. One end of the pull rod of the intelligent adjustment device for unbalanced cable force of the main cable of the multi-tower suspension bridge of the present invention is connected to the intelligent jack, and the other end is firmly clamped on the main cable through the main cable locking clamp to form a stable tension application system. The coordinated use of the pull rod and the main cable locking clamp ensures the stable transmission of tension, improves the reliability and safety of the entire system, and avoids construction accidents caused by unstable tension transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the hoisting of the first beam of the three-tower suspension bridge;

[0028] Figure 2 Schematic diagram of the overall structure of the intelligent adjustment device for unbalanced cable force of the main cable in the middle tower of a multi-tower suspension bridge according to an embodiment of the present invention ( Figure 1 (large sample picture of A in the middle);

[0029] Figure 3 This is a schematic diagram of the connection between the intelligent jack and the cable tower according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the main cable locking clamp structure according to an embodiment of the present invention;

[0031] Figure 5 The present invention is a schematic flow chart of a method for adjusting unbalanced cable force in a main cable of a tower of a multi-tower suspension bridge according to an embodiment of the present invention.

[0032] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-pull rod, 2-intelligent jack, 201-jack bracket, 202-jack top body, 3-main cable locking clamp, 301-main cable clamp, 302-clamp pin, 303-conversion device, 304-pull rod connector, 4-tower top embedded part, 5-cable saddle, 6-main cable, 7-cable tower. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] Embodiment 1:

[0038] like Figure 2 As shown, an embodiment of the present invention provides an intelligent adjustment device for the unbalanced cable force of the main cable in a tower of a multi-tower suspension bridge, comprising a pull rod 1, an intelligent jack 2, a main cable locking clamp 3 and a tower top embedded part 4. The intelligent jack 2 is installed on the top of the cable tower 7 through the tower top embedded part 4, and can accurately apply reverse tension. The main cable locking clamp 3 is firmly clamped on the main cable 6. As the key point of tension transmission, one end of the pull rod 1 is connected to the intelligent jack 2, and the other end is connected to the main cable locking clamp 3. The four form a stable tension application system, which works synergistically. The device is also equipped with a high-precision sensor. During the main beam hoisting process, the cable force on the pull rod 1 and the changes in environmental conditions are monitored in real time according to the high-precision sensor. The intelligent jack 2 applies tension in advance and dynamically adjusts the tension according to the changes during the hoisting process to adjust and balance the unbalanced load that may be generated, thereby effectively avoiding the relative sliding between the main cable and the saddle, achieving the balancing effect of the unbalanced load at the cable tower, and reducing the construction risk. Among them,

[0039] The pull rod 1 is a key component for tension transmission, connecting the smart jack 2 and the main cable locking clamp 3. It not only bears the task of accurately transmitting the tension generated by the smart jack 2 to the main cable, but also must have sufficient strength and rigidity to cope with complex stress conditions. The design of the pull rod needs to consider the selection of materials, fatigue resistance and compatibility with the connectors at both ends to ensure the reliability of the entire system.

[0040] like Figure 3 As shown, the intelligent jack 2 is one of the core components of the device of the present invention, which is installed on the top of the cable tower 7 through the tower top embedded part 4. It is equipped with an advanced monitoring and control system, which can monitor and adjust the applied tension in real time to ensure that it is consistent with the expected design value. In addition, the intelligent jack 2 also has an automatic compensation function, which can maintain a constant tension output when the environmental conditions change.

[0041] The smart jack 2 includes a jack bracket 201 and a jack top body 202. One end of the jack bracket 201 is fixedly connected to the tower top embedded part 4, and the other end is connected to the pull rod 1. The jack top body 202 is fixedly installed inside the jack bracket 201, which not only provides a stable support for the smart jack 202, but also ensures that it can apply the required tension at a precise position.

[0042] like Figure 4 As shown, the main cable locking clamp 3 includes a main cable clamp 301, a clamp pin 302, a conversion device 303 and a pull rod connector 304. The main cable clamp 301 is locked at the second cable clamp position of the main cable 6 by high-strength bolts to form a reliable connection point, and its end is connected to the conversion device 303 through the clamp pin 302, and the conversion device 303 is connected to one end of the pull rod connector 304 through the clamp pin 302. The conversion device 303 changes the direction of force transmission and transmits the force to the main cable 6 more stably. The pull rod connector 304 realizes the seamless connection between the pull rod 1 and the main cable locking clamp 3, ensuring the effective transmission of force.

[0043] Before use, the device of the present invention first installs the main cable clamp 301 on the main cable 6 and locks it with high-strength bolts, installs and connects the main cable clamp 301 and the conversion device 303 through the clamp pin 302, and then installs the intelligent jack 2 on the tower top embedded part 4 of the tower top of the cable tower 7 through high-strength bolts. After the installation is completed, install the pull rod 1 on the intelligent jack 2 through the tower top catwalk and pull it to the main cable locking clamp 3 and reserve a part of the excess. Finally, install the pull rod connector 304 at the end of the pull rod 1, connect the pull rod connector 304 and the conversion device 303 through the clamp pin 302 to complete the installation of the device.

[0044] Before the hoisting of the first main girder, a predetermined reverse tension is applied in advance by the intelligent jack 2. Through the combined use of the main cable locking hoop 3 and the tie rod 1, the tension applied by the intelligent jack 2 is transmitted to the main cable 6 to balance part of the unbalanced load generated during the hoisting of the main girder, thereby controlling the sliding force between the main cable 6 and the saddle 5 to be within a safe range, that is, less than the maximum static friction force between the two. The appropriate pre-tensioning load is determined by calculating the unbalanced load and the maximum friction force. For example, when the unbalanced load during the hoisting of the first beam is a, and the sliding load between the main cable and the saddle is b, at this time, a reverse tension load c is applied in advance by the intelligent jack 2. During the hoisting of the first beam, the unbalanced load (a - c) is less than the sliding load b between the main cable 6 and the saddle 5 (the sliding load b is less than or equal to the maximum static friction force between the main cable and the saddle). The above load relationship is b + c > a, c < b. This can prevent sliding caused by asymmetric hoisting of the main girder and can also significantly reduce the risk of main cable slippage, improving the safety and stability of the overall structure.

[0045] As Figure 4 shown, based on the above device, the present invention provides a method for adjusting the unbalanced cable force of the main cable of the middle tower of a multi-tower suspension bridge, including the following specific steps:

[0046] S100: Install the device on the middle tower and the main cable of the multi-tower suspension bridge for pre-hoisting the main girder, and calculate the pre-tension load in advance; the pre-tension load is determined by calculating the unbalanced load and the maximum friction force.

[0047] S200: Apply the pre-tension load and monitor: Before hoisting the main girder, apply the pre-tension load through the intelligent jack 2 installed on the top of the tower. This tension value is based on the previous calculation and is designed to balance any possible unbalanced load and prevent relative sliding between the main cable and the saddle. During the entire application process, a high-precision sensor is used to continuously monitor the applied load situation to ensure that the actually applied tension conforms to the design value. At the same time, the monitoring system is also responsible for recording changes in environmental conditions (such as temperature, humidity), which may affect the material properties and thus change the required tension value.

[0048] S300: Hoist the first main girder and make dynamic adjustments: Hoist the first main girder according to the predetermined plan. As the main girder is gradually in place, the cable force on the tie rod will change accordingly. Through sensors distributed at various key positions, these changes can be tracked in real time and the data can be fed back to the control system. If it is found that the cable force of the tie rod deviates from the expected range, dynamic and appropriate adjustments are made through the intelligent jack to ensure that the sliding force at the saddle is always less than the friction force, ensuring the structural stability and safety.

[0049] S400: Hoisting and slowly unloading another main span beam section: After the hoisting of the first main beam is completed, the other main span beam sections will be hoisted. During this period, the smart jack needs to gradually release part or all of the tension previously applied according to the hoisting progress. This process is also strictly monitored to ensure that each step is smoothly transitioned and does not affect the stability of the overall structure.

[0050] S500: Hoisting of subsequent beam segments: As more beam segments are added, the bridge structure gradually takes shape. Throughout the process, the previously mentioned steps are repeated, namely calculating the prestressing load, applying appropriate tension, monitoring load changes, and making adjustments when necessary, until the friction at the saddle exceeds the unbalanced load. And continuous monitoring and adjustment are carried out during this process: before each hoisting of a new beam segment, the potential unbalanced load is recalculated and the tension applied by the smart jack is adjusted accordingly. In this way, it is ensured that each hoisting is carried out within a controllable range. The ultimate goal is to make the friction at the saddle large enough so that even if there is an unbalanced load, it cannot cause relative sliding between the main cable and the saddle. This marks the successful completion of this stage of work and also lays a solid foundation for the subsequent construction.

[0051] S600: Dismantling device: Unload the smart jack. After complete unloading, loosen the tie rod first, remove the tie rod connector and place it on the catwalk, then remove the tie rod from the smart jack, and finally remove the smart jack and main cable locking clamp respectively. Use a tower crane to hoist and transport the tie rod, smart jack, main cable locking clamp and accessories to both sides of the side tower.

[0052] Embodiment 2:

[0053] In a three-tower suspension bridge project, the device of the present invention is used to balance the unbalanced cable force of the main cable of the middle tower. The specific use steps are as follows:

[0054] Step 1: The device of the present invention is installed on the middle tower and the main cable, and the prestressing load is calculated according to the environmental conditions and material properties to adapt to different construction conditions.

[0055] Step 2: Due to the change in ambient temperature, the monitoring system records the temperature increase and adjusts the required tension value based on the material's characteristics at high temperatures to ensure that the actual applied tension is consistent with the designed value.

[0056] Step 3: When the first main beam was hoisted, the uneven weight distribution of the main beam caused the cable force to change beyond the expected range. The control system made dynamic adjustments based on the data fed back by the sensor and added additional tension through the smart jack to maintain the stability and safety of the structure.

[0057] Step 4: Lift the other main span beam section and slowly release the pre-tension load applied by the jacks during the process.

[0058] Step 5: As the beam segments are added, the bridge structure is gradually formed. During this process, the pre-tension load is recalculated due to the change in unbalanced load caused by the addition of beam segments, and the tension applied by the jack is adjusted accordingly to ensure that each lifting is carried out within a controllable range.

[0059] Step 6: After dismantling the device, use a tower crane to safely remove and transport the pull rod, smart jack, main cable locking clamp and accessories.

[0060] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent adjustment device for unbalanced cable force of the main cable in a multi-tower suspension bridge, characterized in that: include: An intelligent jack (2) is installed on the top of the tower through a tower top embedded part (4) and is used to apply a pre-tensioning load in advance to adjust the unbalanced load generated during the main beam hoisting process; The main cable locking clamp (3) is firmly clamped on the main cable as a key point for tension transmission; A pull rod (1), one end of which is connected to the intelligent jack (2), and the other end of which is connected to the main cable locking clamp (3), so as to form a stable pre-tensioning load application system; High-precision sensors are arranged at key positions of the device to monitor in real time the changes in the cable force on the pull rod (1) and environmental conditions. The intelligent jack (2) dynamically adjusts the pre-tensioning load according to the changes and transmits the tension to the main cable through the pull rod (1) and the main cable locking clamp (3).

2. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge according to claim 1 is characterized in that: The intelligent jack (2) comprises a jack support (201) and a jack top body (202) fixed inside the jack support.

3. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge according to claim 2 is characterized in that: The intelligent jack (2) is equipped with an advanced monitoring and control system for real-time monitoring and adjusting the magnitude of the applied pre-tensioning load.

4. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge according to claim 3 is characterized in that: The intelligent jack (2) has an automatic compensation function and is used to maintain a constant tension output when environmental conditions change.

5. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge according to any one of claims 1 to 4, characterized in that: The main cable locking clamp (3) comprises a main cable clamp (301) which is locked on the main cable by high-strength bolts, and the end of the main cable clamp is connected to a conversion device (303) for changing the force transmission direction via a clamp pin (302).

6. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge according to claim 5, characterized in that: The main cable locking clamp (3) also includes a pull rod connector (304) having one end connected to the pull rod (1), and the other end of which is connected to the conversion device (303) via the clamp pin (302).

7. The intelligent adjustment device for unbalanced cable force of the main cable in the tower of a multi-tower suspension bridge according to any one of claims 1 to 4, characterized in that: The pull rod (1) is made of a high-strength material with sufficient strength and rigidity.

8. A method for adjusting the unbalanced cable force of the main cable in the middle tower of a multi-tower suspension bridge, which is implemented by using the intelligent adjustment device for unbalanced cable force of the main cable in the middle tower of a multi-tower suspension bridge according to any one of claims 1 to 7, characterized in that: The specific steps include: S100: Install the device on the middle tower and main cable of a multi-tower suspension bridge with pre-installed main beams, and calculate the pre-tension load in advance; S200: Before the main beam is hoisted, the prestressing load is applied according to the calculated prestressing load using the intelligent jack. During the entire application process, the applied load is continuously monitored using a high-precision monitoring system; S300: hoisting the first main beam, during which the tension changes of the pull rods are detected by sensors, and the applied load is dynamically adjusted appropriately by intelligent jacks; S400: hoisting another main span beam section, and during the installation of the suspension rod, the intelligent jack is slowly unloaded to gradually release part or all of the tension previously applied; S500: Hoist the subsequent beam sections and continue with the above steps, i.e. calculate the pre-tension load, apply the appropriate tension, monitor the load changes, and make adjustments if necessary, until the friction force at the saddle exceeds the unbalanced load.

9. A method for adjusting unbalanced cable force of a main cable in a tower of a balanced multi-tower suspension bridge according to claim 8, characterized in that: In step S100 , the pre-tension load is determined by calculating the unbalanced load and the maximum friction force.

10. A method for adjusting unbalanced cable force of a main cable in a tower of a balanced multi-tower suspension bridge according to claim 9, characterized in that: It also includes step S600: unloading the smart jack. After complete unloading, first loosen the pull rod, remove the pull rod connector and place it on the catwalk, then remove the pull rod from the smart jack, and finally remove the smart jack and the main cable locking clamp separately, and use a tower crane to lift and transport the pull rod, smart jack, main cable locking clamp and accessories.

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