Groove box mixed continuous beam swivel bridge span support structure and construction method

Abstract

This application discloses a bridge span support structure and construction method for a hybrid box girder continuous beam swing bridge, specifically relating to the field of bridge support technology. The structure includes a pile foundation, with a pile cap fixedly connected to the top of the pile foundation. A swing system component is located at the center of the top of the pile cap, and a pier component is fixedly connected to the top of the swing system component. A main beam is located on the top of the pier component, comprising a box girder segment and a channel girder segment. A box girder segment is fixedly connected to the center of the top of the pier component, and channel girder segments are fixedly connected to both sides of the box girder segment. The swing system component includes a ball joint, support legs, a slide rail, an upper turntable, a lower turntable, a swing locking block, and an adaptive composite liner. This application dynamically adjusts the friction coefficient through the adaptive composite liner, achieving zero-interference construction across the bridge using the swing system. The hybrid box girder optimizes material distribution, reduces structural weight, and the modular design of the components facilitates construction.

Description

Technical Field

[0001] This application relates to the field of bridge support technology, and more specifically, to a bridge span support structure and construction method for a trough-box hybrid continuous beam swing bridge. Background Technology

[0002] A swing bridge is a bridge constructed using the swing method. Swing construction refers to a construction method where the bridge structure is fabricated in a location not aligned with the design axis and then rotated into place. This method transforms work done above obstacles into work done on the shore or near the ground. Depending on the direction of rotation, it can be categorized into vertical swing construction, horizontal swing construction, and a combination of both. Horizontal swing construction is the most widely used, primarily for situations where supports cannot be provided, such as crossing canyons, rivers, railways, or highways. According to research, existing traditional swing bridge structures often use a single box girder or T-beam. The swing system is based on a ball joint, with support legs and sliding tracks as safety mechanisms. The swing relies on experience to adjust the traction force. The friction coefficient of traditional ball joints is fixed, which cannot respond to dynamic loads such as wind load and temperature changes during the swing process. This can easily lead to large fluctuations in traction force and difficulty in controlling the swing trajectory. Therefore, a bridge span support structure and construction method for a hybrid box girder continuous beam swing bridge are proposed to address the above problems.

[0003] Application content In order to overcome the above-mentioned defects of the prior art, this application provides a bridge span support structure and construction method for a trough-box hybrid continuous beam swing bridge to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides the following technical solution: a bridge span support structure for a hybrid continuous beam swing bridge, comprising pile foundations, a pile cap fixedly connected to the top of the pile foundations, a swing system assembly disposed at the top center of the pile cap, a pier assembly fixedly connected to the top of the swing system assembly, a main beam disposed at the top of the pier assembly, the main beam comprising a box girder segment and a channel girder segment, a box girder segment fixedly connected to the top center of the pier assembly, and channel girder segments fixedly connected to both sides of the box girder segment, the swing system assembly comprising a ball joint, a support leg, a slide rail, an upper turntable, a lower turntable, a swing locking block, and an adaptive composite liner.

[0005] Preferably, the ball joint has an upper turntable at its top and a lower turntable fixedly connected to its bottom. The lower turntable is fixedly connected to the support platform by bolts. The ball joint is composed of two steel ball panels, and the bottom panel of the ball joint is fixed to the top surface of the lower turntable by pre-embedded bolts. The upper panel of the ball joint is connected to the bottom of the upper turntable through a frustum-shaped conical structure.

[0006] Preferably, the ball joint is surrounded by support legs, and there are eight sets of support legs evenly distributed in the circumferential direction of the ball joint. Each set of support legs is a double cylindrical structure and is installed at the bottom of the upper turntable.

[0007] Preferably, the top of the lower turntable is provided with a slide rail, which is an annular steel plate. The center of the slide rail coincides with the center of the ball joint. The top surface of the slide rail is slidably connected to the bottom surface of the support foot. Rotation locking blocks are provided on both sides of each set of support feet. An adaptive composite pad is provided in the middle of the upper and lower steel ball panels of the ball joint.

[0008] Preferably, the pier assembly includes a central pier and side piers. The central pier is fixedly connected to the top of the upper turntable, a main beam is fixedly installed at the top of the central pier, and side piers are fixedly supported at the bottom of both ends of the main beam.

[0009] Preferably, an IoT monitoring mechanism is embedded inside the main beam. The IoT monitoring mechanism includes stress sensors, temperature sensors, and a data acquisition unit. The stress sensors are arranged at key sections of the main beam, including the mid-span and pier top sections of the box girder segment and the variable cross-section area of ​​the channel girder segment. The temperature sensors are distributed inside the top plate, bottom plate, and web of the main beam. The data acquisition unit is fixed in the maintenance room of the pier assembly and connected to the cloud monitoring platform through a wireless transmission module. A carbon fiber reinforcement layer is pasted on the surface of the box girder segment of the main beam, and the carbon fiber reinforcement layer is bonded to the concrete surface with epoxy resin adhesive.

[0010] Preferably, the construction method includes: Step 1: Construction of the foundation structure, drilling and pouring pile foundations and pile caps in the foundation pit, covering and curing the pile cap concrete with a membrane after pouring, using a total station to verify the installation position of the rotating system components, determining the coincidence of the ball joint center with the bridge axis, accurately positioning the lower turntable and slide on the top of the pile cap, fixing the lower turntable to the top surface of the pile cap with pre-embedded bolts, and fixing the slide to the top of the lower turntable with a ring-shaped steel plate. Step 2: Install the rotation system components, including hoisting the ball joint and accurately positioning it to the top of the lower turntable, installing the support feet at the bottom of the upper turntable, aligning the center of the ball joint with the bridge axis, and constructing the main beam in sections using the cast-in-place method with supports. First, cast the box girder section, and then symmetrically cast the trough girder section. Tension the corresponding prestressed steel strands after each section of concrete reaches 90% strength. Step 3: Before rotation, a weighing test is conducted. The unbalanced torque is tested by lifting with jacks. Based on the results, counterweights are applied at preset positions on the beam to make the eccentricity approach zero. Step 4: Implement the rotation construction. Use a traction device to rotate the beam 45° counterclockwise at the bottom of the pier. The rotation speed should not exceed 0.02 rad / min. After each segment is completed, rotate the beam into place in one go. During the rotation, use a measuring robot to monitor the beam end coordinates and support gaps in real time. After the beam is in place, immediately install the rotation locking block to fix the support. Then carry out the closure section construction and system conversion, remove the temporary consolidation, and install the side pier support.

[0011] Preferably, in step four, a displacement sensor is installed at the gap between the support leg and the slide rail, and a jack is installed on the pre-set reaction seat on the pier, with the jack applying jacking force in stages. Record displacement sensor data, plot the force versus displacement curve, and calculate the frictional torque based on the abrupt change points in the curve. and unbalanced torque The formula is: Unbalanced torque: Frictional torque: in, and The force is a double-sided upward force. and As the lever arm, adjust the counterweight according to the calculation results to make the residual eccentricity ≤0.01m.

[0012] Preferably, in step four, before preparing to rotate, the quartz sand is gradually blown out. After blowing out the quartz sand at the bottom of the support foot, the gap between the support foot and the slide is not less than 20mm. Before rotating, the slide should be cleaned, a 5mm thick fluoroethylene sliding plate is pasted on the slide steel plate, and a 5mm thick stainless steel plate is pasted under the support foot's walking plate to reduce the friction coefficient between the rotating walking plate and the slide surface.

[0013] Preferably, in step four, the friction adjustment function of the adaptive composite liner is activated during the rotation construction. The friction coefficient of the ball joint is adjusted in real time through the hydraulic system. At the same time, the IoT monitoring agency collects stress data in real time. When the stress change rate at the monitoring point exceeds the threshold, the system automatically issues an early warning and suspends the rotation until the cause is investigated before continuing.

[0014] The technical effects and advantages of this application are as follows: 1. Compared with existing technologies, this type of trough-box hybrid continuous beam swing bridge span support structure and construction method provides bending stiffness through the box girder segment of the main beam and reduces self-weight through the trough girder segment. The two are connected into a continuous system by prestressed steel strands. During the swing, the support feet and the slide rail form a safety mechanism. The swing locking block fixes the structure after it is in place. The adaptive composite liner dynamically adjusts the friction coefficient. The swing system achieves zero interference during cross-line construction, significantly reducing the impact on existing traffic. The trough-box hybrid main beam optimizes material distribution, reduces structural self-weight, saves building materials, and the modular design of the components facilitates construction. The adaptive composite liner improves the controllability of the swing process.

[0015] 2. Compared with existing technologies, this type of trough-box hybrid continuous beam swing bridge span support structure and construction method calculates the frictional torque and unbalanced torque based on the curve abrupt change point, adjusts the counterweight according to the calculation results to reduce the residual eccentricity, improves the accuracy through formulaic calculation to reduce the error of frictional torque, and can detect unbalance early through the jacking force and displacement curve to avoid swing jamming. The counterweight adjustment makes the swing start smooth and reduces traction energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a three-dimensional structural diagram of the rotating system components of this application; Figure 3 This is a schematic diagram of the connection structure between the rotating system components and the pier components of this application; Figure 4 This is a schematic diagram of the ball joint and adaptive composite gasket connection structure of this application; Figure 5 This is a schematic diagram of the connection structure between the main beam and the IoT monitoring mechanism in this application; Figure 6 This is a top view of the rotating system components of this application; Figure 7 This is a schematic diagram of the construction method of this application.

[0017] The attached diagram is labeled as follows: 1. Pile foundation; 2. Pile cap; 3. Rotation system component; 301. Ball joint; 302. Support leg; 303. Slide rail; 304. Upper turntable; 305. Lower turntable; 306. Rotation locking block; 307. Adaptive composite liner; 4. Pier component; 401. Middle pier; 402. Side pier; 5. Main beam; 501. Box girder segment; 502. Channel girder segment; 6. Internet of Things monitoring mechanism; 601. Stress sensor; 602. Temperature sensor; 603. Data acquisition unit; 7. Carbon fiber reinforcement layer. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Example 1 As attached Figures 1 to 6The bridge span support structure of a hybrid continuous beam swing bridge shown includes pile foundations 1, a pile cap 2 fixedly connected to the top of the pile foundations 1, a swing system component 3 disposed at the center of the top of the pile cap 2, a pier component 4 fixedly connected to the top of the swing system component 3, and a main beam 5 disposed on the top of the pier component 4. The main beam 5 includes a box girder segment 501. The pier assembly 4 is fixedly connected to the top center of the trough beam segment 502 and the box beam segment 501. The trough beam segments 502 are fixedly connected to both sides of the box beam segment 501. The rotation system assembly 3 includes a ball joint 301, a support leg 302, a slide rail 303, an upper turntable 304, a lower turntable 305, a rotation locking block 306, and an adaptive composite liner 307. The pile foundation 1 bears the vertical load and transfers it to the foundation. The pile cap 2 acts as a transition component to distribute the load to the pile group. The rotation system assembly 3 is installed on the top of the pile cap 2. During the construction phase, the pier bottom is rotated through the ball joint 301, allowing the pier assembly 4 and the main beam 5 to be connected at one time. During the rotation and positioning, the box girder segment 501 of the main beam 5 provides bending stiffness, while the trough girder segment 502 reduces its self-weight. The two are connected into a continuous system by prestressed steel strands. During the rotation, the support leg 302 and the slide rail 303 form a safety mechanism. The rotation locking block 306 fixes the structure after positioning. The adaptive composite liner 307 dynamically adjusts the friction coefficient. The rotation system component 3 achieves zero interference during cross-line construction, significantly reducing the impact on existing traffic. The trough-box hybrid main beam 5 optimizes material distribution, reduces structural self-weight, and saves building materials. The modular design of the components facilitates construction, and the adaptive composite liner 307 improves the controllability of the rotation process.

[0020] In a preferred embodiment, the ball joint 301 has an upper turntable 304 at its top and a lower turntable 305 fixedly connected to its bottom. The lower turntable 305 is bolted to the support platform 2. The ball joint 301 consists of two steel ball panels, an upper and a lower one. The bottom panel of the ball joint 301 is fixed to the top surface of the lower turntable 305 by pre-embedded bolts. The upper panel of the ball joint 301 is connected to the bottom of the upper turntable 304 via a frustum-shaped cone structure. The ball joint 301 acts as a rotation pivot, and its lower ball joint panel is fixed to the top surface of the lower turntable 305 by pre-embedded bolts. The upper ball joint panel is connected to the bottom of the upper turntable 304 via a truncated cone. During installation, the lower turntable 305 is first precisely positioned on the top of the foundation 2. The ball joint 301 is hoisted and the horizontal error is calibrated. Then the upper turntable 304 is installed. During rotation, the spherical sliding radius of the ball joint 301 is 6.0m, which causes the upper structure to rotate around the vertical axis. The pre-eccentricity of 0.3m compensates for the unbalanced moment. The load is evenly transmitted through the steel panel of the ball joint 301 to avoid stress concentration. The truncated cone connection enhances the tensile strength of the ball joint 301 and the turntable to prevent the risk of separation. The pre-embedded bolts fix the structure to improve shear resistance.

[0021] In a preferred embodiment, the ball joint 301 is surrounded by support feet 302. There are eight sets of support feet 302 evenly distributed around the circumference of the ball joint 301. Each set of support feet 302 is a double cylindrical structure and is installed at the bottom of the upper turntable 304. The eight sets of symmetrically distributed support feet 302 provide multi-point support, improve the anti-overturning safety factor, disperse contact stress, avoid local deformation of the slide rail 303, allow for compensation of minor deformations, prevent jamming, and the even distribution reduces rotational vibration, making angular velocity control more precise.

[0022] In a preferred embodiment, a slide rail 303 is provided on the top of the lower turntable 305. The slide rail 303 is an annular steel plate, and its center coincides with the center of the ball joint 301. The top surface of the slide rail 303 is slidably connected to the bottom surface of the support leg 302. A rotation locking block 306 is provided on both sides of each set of support legs 302. An adaptive composite pad 307 is provided in the middle of the upper and lower steel ball plates of the ball joint 301. The slide rail 303 is fixed to the top of the lower turntable 305 as an annular track. During rotation, it slides in contact with the bottom surface of the support leg 302. When the gap disappears, the rotation locking block 306 is installed on both sides of each set of support legs 302 after being in place, and the slide rail 303 is locked with high-strength bolts to form a rigid connection. The rotation locking block 306 provides instantaneous fixation to prevent accidental rotation caused by wind load. The adaptive composite liner 307 dynamically balances torque fluctuations and reduces peak traction force. The adaptive composite liner 307 integrates a piezoelectric material layer, using piezoelectric ceramics or polymers as sensors and actuators. It generates electrical signals when compressed and produces micro-deformation when voltage is applied, changing the surface friction characteristics. A microchannel network is prefabricated in the liner, and the interior is filled with a smart magnetorheological fluid with controllable viscosity. By changing the electric or magnetic field applied to the fluid, its viscosity can be adjusted in real time and continuously, thereby changing the effective friction coefficient of the entire friction pair. The surface is made of high-strength, low-wear engineering plastic to ensure durability.

[0023] In a preferred embodiment, the pier assembly 4 includes a central pier 401 and side piers 402. The central pier 401 is fixedly connected to the top of the upper turntable 304. The main beam 5 is fixedly installed at the top of the central pier 401, and the side piers 402 are fixedly supported at the bottom of both ends of the main beam 5. The central pier 401 is fixed to the top of the upper turntable 304 and serves as the main support to transfer the load. The side piers 402 support both ends of the main beam 5 and provide boundary constraints. During construction, the central pier 401 is rigidly connected to the box girder segment 501 of the main beam 5. The side piers 402 adapt to temperature deformation through supports. After rotation, the system transformation makes the main beam 5 form a continuous system. The load is distributed to the foundation through the central pier 401 and the side piers 402. The central pier 401 provides concentrated support to reduce the mid-span bending moment and improve the span stiffness. The side piers 402 have movable supports that allow longitudinal displacement and release temperature stress.

[0024] In a preferred embodiment, an Internet of Things (IoT) monitoring mechanism 6 is embedded inside the main beam 5. The IoT monitoring mechanism 6 includes a stress sensor 601, a temperature sensor 602, and a data acquisition unit 603. The stress sensor 601 is located at key sections of the main beam 5, including the mid-span and pier top sections of the box girder segment 501 and the variable cross-section area of ​​the trough girder segment 502. The temperature sensor 602 is distributed inside the top plate, bottom plate, and web of the main beam 5. The data acquisition unit 603 is fixed in the maintenance chamber of the pier assembly 4 and connected to a cloud monitoring platform via a wireless transmission module. A carbon fiber reinforcement layer 7 is bonded to the surface of the box girder segment 501 of the main beam 5. The fiber-reinforced layer 7 is bonded to the concrete surface with epoxy resin adhesive. Stress sensors 601 and temperature sensors 602 are embedded in key sections of the main beam 5, such as mid-span and pier top. Data acquisition unit 603 transmits data to the cloud in real time. During the construction phase, it monitors changes in concrete stress, such as prestressing, and during the operation phase, it tracks vehicle-borne effects. The carbon fiber-reinforced layer 7 is bonded to the surface of the box girder segment 501. After construction, it shares the load with the concrete. The carbon fiber-reinforced layer 7 improves bending stiffness, extends fatigue life, provides real-time data early warning to avoid sudden accidents, supports predictive maintenance, and provides support for big data analysis through system integration with the cloud platform, thus optimizing maintenance decisions.

[0025] Example 2 Based on Example 1, the solution in Example 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 7 As shown below, see details: Construction methods include: Step 1: Construction of the foundation structure. Drill and pour pile foundation 1 and pile cap 2 in the foundation pit. After the concrete of pile cap 2 is poured, cover it with a membrane for heat preservation and curing for 7 days. Use a total station to check the installation position of the rotating system component 3 and determine the coincidence of the center of the ball hinge 301 with the bridge axis. Precisely position the lower turntable 305 and slide rail 303 on the top of pile cap 2. The lower turntable 305 is fixed to the top surface of pile cap 2 by pre-embedded bolts. The slide rail 303 is a ring steel plate and is fixed to the top of the lower turntable 305. Step 2: Install the rotation system component 3, including hoisting the ball joint 301 and accurately positioning it on the top of the lower turntable 305, installing the support leg 302 at the bottom of the upper turntable 304, aligning the center of the ball joint 301 with the bridge axis, and constructing the main beam 5 in sections using the bracket casting method. First, cast the box beam section 501, and then symmetrically cast the trough beam section 502. After each section of concrete reaches 90% strength, tension the corresponding prestressed steel strands. Step 3: Before rotation, a weighing test is conducted. The unbalanced torque is tested by lifting with jacks. Based on the results, counterweights are applied at preset positions on the beam to make the eccentricity approach zero. Step 4: Implement the rotation construction. Use a traction device to rotate the beam 45° counterclockwise at the bottom of the pier. The rotation speed should not exceed 0.02 rad / min. After the construction of each segment is completed, rotate the beam into place in one go. During the rotation, the beam end coordinates and the gap of the support leg 302 are monitored in real time by a measuring robot. After the beam is in place, immediately install the rotation locking block 306 to fix the support leg 302, carry out the closure section construction and system conversion, remove the temporary consolidation, and install the side pier 402 support.

[0026] In a preferred embodiment, in step four, a displacement sensor is installed at the gap between the support leg 302 and the slide rail 303, and a jack is installed on the preset reaction seat of the bearing platform 2, with the jack applying jacking force step by step. Record displacement sensor data, plot the force versus displacement curve, and calculate the frictional torque based on the abrupt change points in the curve. and unbalanced torque The formula is: Unbalanced torque: Frictional torque: in, and The force is a double-sided upward force. and As the lever arm, the counterweight is adjusted according to the calculation results to make the residual eccentricity ≤0.01m. Among them, the formulaic calculation improves the accuracy and reduces the friction torque error. The imbalance can be detected early by the top force and displacement curve to avoid the rotation jamming. The counterweight adjustment makes the rotation start smooth and reduces traction energy consumption.

[0027] In a preferred embodiment, in step four, before preparing to rotate, the quartz sand is gradually blown out. After blowing out the quartz sand at the bottom of the support foot 302, the gap between the support foot 302 and the slide rail 303 is not less than 20mm. Before rotation, the slide rail 303 should be cleaned. A 5mm thick polytetrafluoroethylene (PTFE) sliding plate is pasted on the steel plate of the slide rail 303, and a 3mm thick stainless steel plate is pasted under the running plate of the support foot 302 to reduce the friction coefficient between the rotating running plate and the surface of the slide rail 303. Among them, the PTFE sliding plate reduces the sliding friction coefficient, the stainless steel plate is wear-resistant and extends the service life of the slide rail 303, and the gap ≥20mm prevents thermal expansion jamming. The standardized process ensures construction consistency and reduces human error.

[0028] As a preferred implementation, in step four, the friction adjustment function of the adaptive composite liner 307 is activated during the rotation construction. The friction coefficient of the ball joint 301 is adjusted in real time through the hydraulic system. At the same time, the IoT monitoring mechanism 6 collects stress data in real time. When the stress change rate at the monitoring point exceeds the threshold, the system automatically issues an early warning and suspends the rotation. The rotation continues after the cause is investigated. The dynamic adjustment of the friction coefficient is used to deal with unbalanced torque fluctuations and improve the success rate of the rotation. The automatic early warning mechanism reduces the risk of accidents. The linkage with the IoT monitoring mechanism 6 realizes closed-loop control, reduces manual intervention, and adapts to changing environments.

[0029] The working process of this application is as follows: First, pile foundation 1 and pile cap 2 are drilled and poured in the foundation pit. After the concrete of pile cap 2 is poured, it is covered with a membrane for heat preservation and curing. The installation position of the rotation system component 3 is checked using a total station to determine the coincidence of the center of the ball hinge 301 with the bridge axis. The lower turntable 305 and slide rail 303 are precisely positioned on the top of pile cap 2. The lower turntable 305 is fixed to the top surface of pile cap 2 by pre-embedded bolts. The slide rail 303 is a ring-shaped steel plate, which is fixed to the top of the lower turntable 305. The rotation system component 3 is installed, including hoisting the ball hinge 301 and precisely positioning it on the top of the lower turntable 305. The support legs 302 are installed on the upper turntable. At the bottom of plate 304, the center of calibrated ball hinge 301 is aligned with the bridge axis. The main beam 5 is constructed in sections using the cast-in-place method with supports. First, the box girder segment 501 is poured, followed by the symmetrical pouring of the trough girder segment 502. After each segment of concrete reaches 90% strength, the corresponding prestressed steel strands are tensioned. Before rotation, the quartz sand is gradually blown out. After blowing out the quartz sand at the bottom of the support foot 302, the gap between the support foot 302 and the slide rail 303 should not be less than 20mm. Before rotation, the slide rail 303 should be cleaned. A 5mm thick fluoroethylene sliding plate is pasted on the steel plate of the slide rail 303, and a 3mm thick stainless steel plate is pasted under the running plate of the support foot 302. To reduce the friction coefficient between the rotating platform and the slide rail 303 surface, a gap of ≥20mm is maintained to prevent thermal expansion and jamming. Standardized procedures ensure construction consistency and reduce human error. A weighing test is conducted before rotation, and the unbalanced torque is tested by lifting with jacks. Based on the results, counterweights are applied at preset positions on the beam to bring the eccentricity close to zero before rotation construction. During rotation construction, the friction adjustment function of the adaptive composite liner 307 is activated, and the friction coefficient of the ball joint 301 is adjusted in real time through the hydraulic system. Simultaneously, the IoT monitoring mechanism 6 collects stress data in real time. When the stress change rate at the monitoring point exceeds the threshold, [the system will detect the stress change]. The system automatically issues a warning and pauses the rotation. After investigating the cause, it resumes, using a traction device to rotate 45° counterclockwise around the pier base at a speed not exceeding 0.02 rad / min. After each segment is completed, the bridge is rotated into place in one go. During the rotation, a measuring robot monitors the beam end coordinates and the gap between the support legs 302 in real time. After the bridge is in place, the rotation locking block 306 is immediately installed to fix the support legs 302. The closure section construction and system conversion are then carried out, the temporary consolidation is removed, and the side pier 402 support is installed. The above describes the working principle of the bridge span support structure and construction method of this type of trough-box hybrid continuous beam rotating bridge.

Claims

1. A bridge span support structure for a trough-box hybrid continuous beam swing bridge, comprising pile foundations (1), characterized in that: The top of the pile foundation (1) is fixedly connected to a pile cap (2). A rotating system component (3) is provided at the center of the top of the pile cap (2). A pier component (4) is fixedly connected to the top of the rotating system component (3). A main beam (5) is provided at the top of the pier component (4). The main beam (5) includes a box beam segment (501) and a channel beam segment (502). A box beam segment (501) is fixedly connected at the center of the top of the pier component (4). Channel beam segments (502) are fixedly connected to both sides of the box beam segment (501). The rotating system component (3) includes a ball joint (301), a support leg (302), a slide (303), an upper turntable (304), a lower turntable (305), a rotating locking block (306), and an adaptive composite liner (307).

2. The bridge span support structure of a trough-box hybrid continuous beam rotating bridge according to claim 1, characterized in that: The ball joint (301) has an upper turntable (304) at its top and a lower turntable (305) fixedly connected to its bottom. The lower turntable (305) is fixedly connected to the support platform (2) by bolts. The ball joint (301) is composed of two steel ball panels, and the bottom panel of the ball joint (301) is fixed to the top surface of the lower turntable (305) by pre-embedded bolts. The upper panel of the ball joint (301) is connected to the bottom of the upper turntable (304) through a frustum conical structure.

3. The bridge span support structure of a trough-box hybrid continuous beam rotating bridge according to claim 2, characterized in that: The ball joint (301) is surrounded by support feet (302). There are eight sets of support feet (302) evenly distributed around the circumference of the ball joint (301). Each set of support feet (302) is a double cylindrical structure and is installed at the bottom of the upper turntable (304).

4. The bridge span support structure of a trough-box hybrid continuous beam rotating bridge according to claim 3, characterized in that: The lower turntable (305) is provided with a slide (303) at the top. The slide (303) is an annular steel plate. The center of the slide (303) coincides with the center of the ball joint (301). The top surface of the slide (303) is slidably connected to the bottom surface of the support foot (302). A rotation locking block (306) is provided on both sides of each set of support feet (302). An adaptive composite pad (307) is provided in the middle of the upper and lower steel ball panels of the ball joint (301).

5. The bridge span support structure of a trough-box hybrid continuous beam rotating bridge according to claim 3, characterized in that: The pier assembly (4) includes a middle pier (401) and side piers (402). The top of the upper turntable (304) is fixedly connected to the middle pier (401). The top of the middle pier (401) is fixedly provided with a main beam (5). The bottom of both ends of the main beam (5) is fixedly supported by side piers (402).

6. The bridge span support structure of a trough-box hybrid continuous beam rotating bridge according to claim 5, characterized in that: The main beam (5) is equipped with an Internet of Things (IoT) monitoring mechanism (6). The IoT monitoring mechanism (6) includes a stress sensor (601), a temperature sensor (602), and a data acquisition unit (603). The stress sensor (601) is arranged at key sections of the main beam (5), including the mid-span and pier top sections of the box girder segment (501) and the variable cross-section area of ​​the channel girder segment (502). The temperature sensor (602) is distributed inside the top plate, bottom plate, and web of the main beam (5). The data acquisition unit (603) is fixed in the maintenance room of the pier assembly (4) and connected to the cloud monitoring platform through a wireless transmission module. The surface of the box girder segment (501) of the main beam (5) is covered with a carbon fiber reinforcement layer (7). The carbon fiber reinforcement layer (7) is bonded to the concrete surface with epoxy resin adhesive.

7. A construction method for a bridge span support structure of a trough-box hybrid continuous beam swing bridge, employing the bridge span support structure of any one of claims 1-6, characterized in that: The construction method includes: Step 1: Construction of the foundation structure, drilling and pouring pile foundation (1) and pile cap (2) in the foundation pit, covering the pile cap (2) with a membrane for heat preservation and curing after concrete pouring, using a total station to check the installation position of the rotating system component (3), determining the coincidence of the center of the ball hinge (301) with the bridge axis, accurately positioning the lower turntable (305) and slide (303) on the top of the pile cap (2), fixing the lower turntable (305) to the top surface of the pile cap (2) with pre-embedded bolts, and fixing the slide (303) to the top of the lower turntable (305) with a ring steel plate. Step 2: Install the rotating system components (3), including hoisting the ball joint (301) and accurately positioning it on the top of the lower turntable (305), installing the support legs (302) at the bottom of the upper turntable (304), calibrating the center of the ball joint (301) to coincide with the bridge axis, and constructing the main beam (5) in sections using the bracket casting method. First, pour the box beam section (501), and then symmetrically pour the trough beam section (502). After the concrete strength of each section reaches 90%, tension the corresponding prestressed steel strands. Step 3: Before rotation, a weighing test is conducted. The unbalanced torque is tested by lifting with jacks. Based on the results, counterweights are applied at preset positions on the beam to make the eccentricity approach zero. Step 4: Implement the rotation construction. Use a traction device to rotate the beam 45° counterclockwise at the bottom of the pier. The rotation speed should not exceed 0.02 rad / min. After each segment is completed, rotate the beam into place in one go. During the rotation, use a measuring robot to monitor the beam end coordinates and the gap of the support foot (302) in real time. After the beam is in place, immediately install the rotation locking block (306) to fix the support foot (302), carry out the closure section construction and system conversion, remove the temporary consolidation, and install the side pier (402) support.

8. The construction method of the bridge span support structure of the trough-box hybrid continuous beam swing bridge according to claim 7, characterized in that: In step four, a displacement sensor is installed at the gap between the support leg (302) and the slide rail (303), and a jack is installed on the pre-set reaction seat on the support platform (2). The jack applies jacking force step by step. Record displacement sensor data, plot the force versus displacement curve, and calculate the frictional torque based on the abrupt change points in the curve. and unbalanced torque The formula is: Unbalanced torque: Frictional torque: in, and The force is a double-sided upward force. and As the lever arm, adjust the counterweight according to the calculation results to make the residual eccentricity ≤0.01m.

9. The construction method of the bridge span support structure of the trough-box hybrid continuous beam swing bridge according to claim 8, characterized in that: In step four, before the rotation is prepared, the quartz sand is gradually blown out. After the quartz sand at the bottom of the support foot (302) is blown out, the gap between the support foot (302) and the slide (303) is not less than 20mm. Before rotation, the slide should be cleaned. A 5mm thick fluoroethylene sliding plate is pasted on the steel plate of the slide (303), and a 3mm thick stainless steel plate is pasted under the walking plate of the support foot (302) to reduce the friction coefficient between the rotating walking plate and the surface of the slide (303).

10. The construction method of the bridge span support structure of the trough-box hybrid continuous beam swing bridge according to claim 9, characterized in that: In step four, the friction adjustment function of the adaptive composite liner (307) is activated during the rotation construction. The friction coefficient of the ball joint (301) is adjusted in real time through the hydraulic system. At the same time, the Internet of Things monitoring mechanism (6) collects stress data in real time. When the stress change rate at the monitoring point exceeds the threshold, the system automatically issues an early warning and suspends the rotation until the cause is investigated and the rotation continues.

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