Prefabricated height-adjustable support system for swivel bridge and construction method

Abstract

The invention provides a prefabricated height-adjustable support system for a swivel bridge and a construction method. The system comprises an embedded base, a lower support plate, a height-adjustable core module, an upper support plate and a locking device. The pre-embedded base is of a reinforced concrete structure, the pre-embedded base and a side pier cover beam are cast and formed at the same time before swivel construction, and an anchoring part used for subsequent connection is pre-embedded in the top of the pre-embedded base; the lower support plate is fixedly mounted on the embedded base through the anchoring part; the height-adjustable core module is arranged on the lower support plate, is used for bearing and transmitting an upper structure load and can realize stepless height adjustment in the vertical direction; the upper support plate is supported on the height-adjustable core module, and the top of the upper support plate is used for making contact with a beam bottom embedded part of a swivel beam and transmitting loads. The locking device comprises a temporary locking mechanism and a final locking mechanism. The construction safety and efficiency are remarkably improved, and it is ensured that the stress state of the structure is highly matched with the design.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a prefabricated adjustable height support system and construction method for rotating bridges. Background Technology

[0002] The bridge rotation method has been widely used in the construction of bridges spanning busy railways and highways due to its advantages such as minimal disruption to traffic below and high construction safety. However, for continuous beam bridges with cast-in-place closure sections without side spans, existing technologies mainly face the following two challenges: Firstly, while the technical solution disclosed in existing patent CN116043722A allows for pre-lifting simulation calculations and pouring of the side pier support pads before rotation, this method suffers from complex calculation processes and extremely high precision requirements. More critically, once the support pads are poured, subsequent adjustments are impossible, placing stringent demands on the accuracy of construction measurements and theoretical calculations. In actual construction, any accumulated errors can cause deviations between the support reaction force and the design value after the beam is rotated and lowered, thus posing a potential safety hazard to the structure.

[0003] Secondly, the technical solution disclosed in existing patent CN109505255A, which involves constructing the bearing pads or cap beams after the bridge is rotated, effectively avoids the complex pre-calculation process but introduces new technical challenges. After the rotation, construction workers need to perform high-altitude wet operations in a narrow and enclosed space under the beam, which is difficult to operate and makes it hard to ensure construction quality. In addition, this secondary construction after rotation not only prolongs the construction period but also poses a continuous threat to the safe operation of the existing railway line under the bridge.

[0004] In summary, existing side span bearing construction technologies for rotating bridges generally suffer from the technical dilemma that cannot be adjusted if installed before the rotation, while construction after the rotation carries significantly increased risks. Therefore, there is an urgent need in this field for a side span bearing solution that can complete all installation work before the rotation and enable convenient and precise adjustment after the rotation, to ensure that the stress state of the completed bridge fully matches the design requirements. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, the present invention aims to provide a prefabricated adjustable height bearing system and construction method for rotating bridges. This bearing system can be fully installed on the side piers before rotation, and after rotation, precise positioning of the beam and accurate control of the bearing reaction force can be achieved through simple mechanical operations. This completely eliminates the need for secondary construction after rotation, achieving the technical effects of simplified procedures, guaranteed quality, and ensured safety.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a prefabricated adjustable height support system for rotating bridges, including a pre-embedded base, a lower support plate, an adjustable height core module, an upper support plate, and a locking device.

[0007] The embedded base is a reinforced concrete structure, cast simultaneously with the side pier cap beam before the rotation construction. Anchors for subsequent connections are pre-embedded in its top. As the fundamental load-bearing component of the entire support system, the top elevation and anchor positions of the embedded base must be precisely controlled during the casting process to ensure subsequent installation accuracy.

[0008] The lower support plate is fixedly installed on the pre-embedded base by the anchors. The lower support plate is a thick steel plate with connection holes corresponding to the pre-embedded anchors. The lower support plate is firmly fixed to the pre-embedded base by nuts and other fasteners to form a stable lower support platform.

[0009] The adjustable height core module is mounted on the lower support plate and is used to bear and transmit the load of the superstructure, enabling stepless height adjustment in the vertical direction. This module is the key component for achieving the height adjustable function of this support system, and the design of its adjustment mechanism directly determines the adjustment accuracy and load-bearing capacity of the entire system.

[0010] The upper support plate rests on the adjustable height core module, and its top is used to contact the embedded part at the bottom of the rotating beam and transfer the load. The upper support plate is also a thick steel plate, which moves up and down under the action of the adjustable height core module, and finally comes into close contact with the embedded part at the bottom of the beam, transferring the upper load to the lower structure.

[0011] The locking device includes a temporary locking mechanism and a final locking mechanism. The temporary locking mechanism is used to lock the adjustable core module at a preset rotation height position during the rotation process to ensure sufficient rotation safety clearance between the end of the side span of the rotating beam and the top surface of the support. The final locking mechanism is used to solidify the entire support system into a rigid whole after the beam is lowered and adjusted, so that it functions as a permanent support.

[0012] In a preferred embodiment of the present invention, the adjustable height core module is a wedge-shaped slider assembly, including an upper wedge block, a lower wedge block, and a horizontal drive device. The lower wedge block is mounted on the lower support plate and can slide horizontally, with an inclined wedge-shaped slope machined on its upper surface. The upper wedge block is placed on the inclined surface of the lower wedge block, with a symmetrical inclined surface at its bottom matching the slope of the upper surface of the lower wedge block, and its top surface is horizontal, directly supporting the upper support plate. The horizontal drive device is horizontally mounted on the bracket of the lower support plate, with its piston rod end connected to the lower wedge block. By pushing the lower wedge block to slide horizontally relative to the upper support plate, the upper support plate is raised and lowered vertically.

[0013] Furthermore, the horizontal drive device is a through-hole hydraulic jack, which is connected to a hydraulic control system. The pressure gauge in the hydraulic system can monitor the support reaction force in real time to ensure it matches the design value. Using a hydraulic drive not only achieves smooth and precise jacking control but also enables quantitative management of the support reaction force through the pressure monitoring system.

[0014] Furthermore, the temporary locking mechanism includes at least two adjusting screws, which are inserted through positioning holes pre-set on the lower wedge block. Each adjusting screw has a locking nut at both ends. Temporary locking is achieved by tightening the locking nuts when the wedge block assembly is adjusted to its lowest position before rotation. The adjusting screws can be used for position locking before rotation, and also serve as auxiliary adjustment and temporary pressure holding during the lifting process.

[0015] Furthermore, the final locking mechanism comprises multiple locking plates made of thick steel plates. After the beam height adjustment is completed and the support stress stability is confirmed, the locking plates are symmetrically welded into the lateral gap between the upper and lower support plates, completely eliminating the possibility of movement of the adjustable core module and fixing the entire system into a rigid whole. The welded locking plates transform the originally adjustable support system into a permanent rigid support, ensuring that the support will not shift during bridge operation.

[0016] Furthermore, the wedge-shaped slider assembly includes one or more pairs of matching wedge blocks. In each pair, the lower wedge block is connected to the lower support plate, and the upper wedge block is in contact with the upper support plate. Multiple pairs of wedge blocks work together to improve load-bearing capacity and adjustment stability. The number of wedge blocks can be flexibly configured according to the design requirements of the rotating beam weight and support reaction force to meet the load-bearing needs under different engineering conditions.

[0017] Furthermore, the top of the upper support plate is also provided with a support body, which is used for precise docking and force transmission with the pre-embedded parts at the bottom of the rotating beam. The setting of the support body further optimizes the force transmission path, ensuring that the load can be transmitted evenly and stably to the lower structure.

[0018] The present invention also provides a construction method using the above-mentioned prefabricated adjustable height support system, comprising the following steps: Step S1, Foundation Construction Before Rotation: Construct the main pier and side piers according to the design requirements. Simultaneously pour the pre-embedded base during the construction of the side pier cap beam, precisely controlling the top elevation of the pre-embedded base and the pre-embedded position of the anchors. The construction accuracy of the pre-embedded base directly affects the accuracy of subsequent support installation; therefore, precise measurement methods must be used to ensure that all dimensional deviations are controlled within the allowable range.

[0019] Step S2, Installation and Locking of the Support System: After the concrete of the pre-embedded base reaches its design strength, install the lower support plate, lower wedge block, upper wedge block, horizontal drive device, and upper support plate in sequence. Operate the horizontal drive device to retract the lower wedge block to its limit position, so that the entire support system is at its lowest rotation height. Then, insert the temporary locking mechanism to lock it in place. Measure to ensure that the elevation of the top surface of the upper support plate is lower than the design elevation of the bottom of the beam at the end of the rotating beam, thus forming a safe rotation clearance. Setting this safe rotation clearance is a key parameter to ensure that the beam can safely pass over the support during the rotation process.

[0020] Step S3, Manufacturing the Rotating Beam: A full-length rotating beam of the same length as the completed bridge is manufactured using a cast-in-place method with supports in a direction parallel to the bridge site. This rotating beam has no side spans and is cast in place for closure. Manufacturing the rotating beam along its entire length eliminates the closure section construction step in traditional methods, significantly simplifying the construction process.

[0021] Step S4, Rotation Construction: The rotation system on the main pier is activated to drive the rotating beam to rotate smoothly. During the rotation, the end of the side span of the rotating beam safely passes over the locked side span support system, maintaining a safe rotation clearance at all times. Since the supports are pre-installed and locked in a low position, no additional protective measures are required for the existing railway line under the bridge during the rotation process, and the entire rotation operation does not interfere with traffic under the bridge.

[0022] Step S5, Adjusting the Height of the Side Span Supports: After the body is precisely positioned, the horizontal drive devices on all side span supports are simultaneously activated to push the lower wedge blocks forward. The lifting amount of the upper support plate is monitored in real time by displacement sensors. After lifting to contact with the embedded parts at the bottom of the beam, precise preloading is continued according to the design requirements for the support reaction force. The pressure gauge of the hydraulic system is used to monitor and ensure that the support reaction force matches the design value. The criteria for determining the lifting contact include: the displacement sensor showing that the lifting amount has reached the pre-calculated value, the hydraulic system pressure starting to rise significantly, and the elimination of the gap between the upper support plate and the embedded parts at the bottom of the beam. During precise preloading, the load is gradually increased and the pressure gauge reading is observed until the design support reaction force value is reached. Then, the hydraulic system is locked and temporary locking nuts are installed to maintain pressure.

[0023] Step S6, Final Locking and Bridge Completion: After confirming that all supports are stable under stress, the locking plate is welded between the upper and lower support plates to completely eliminate the possibility of movement of the adjustable core module. The bridge deck system and ancillary facilities are then constructed to bring the bridge into operational status. After final locking, the original adjustable supports are transformed into permanent rigid supports, providing reliable support for the long-term operation of the bridge.

[0024] Furthermore, in step S5, when coordinating the adjustment of each abutment support, a multi-point synchronous jacking control technology is adopted. Displacement sensors and pressure gauges in the hydraulic system simultaneously monitor the jacking displacement and reaction force values ​​of each support, ensuring uniform stress on each support and that the support reaction force reaches the design value. Multi-point synchronous control effectively avoids additional stress on the beam caused by asynchronous jacking of each support, ensuring the safety and controllability of the system conversion process.

[0025] Compared with the prior art, the present invention has the following beneficial effects: First, this invention arranges all concrete pouring and support installation work to be completed before the bridge rotation, completely eliminating the risk of high-altitude wet work above existing traffic lines after the rotation. In traditional methods, construction workers need to perform dangerous operations such as concrete pouring and formwork erection in the confined space under the beam, resulting in not only harsh working conditions but also posing a safety threat to operating railways or highways below. This invention fundamentally avoids this risk, significantly improving the inherent safety level of construction operations and substantially enhancing construction safety.

[0026] Secondly, because the support system of this invention is fully installed and ready before the bridge rotation, once the bridge is in place, only the hydraulic system needs to be activated for mechanical lifting to complete the beam lowering. The entire height adjustment process can be completed within a few hours. Compared to the traditional method, which requires a series of procedures such as support pad pouring, curing, and support installation after the rotation, this invention can save 7 to 14 days or more in construction time, significantly improving construction efficiency. This is of great significance for engineering projects that need to restore traffic under the bridge as soon as possible.

[0027] Third, this invention utilizes the mechanical transmission principle of a wedge-shaped slider assembly to convert minute horizontal displacements into precise vertical lifting, achieving stepless continuous adjustment of the support height. The hydraulic system, in conjunction with pressure gauges, monitors the support reaction force in real time, ensuring that the reaction force of each support precisely matches the design value. This closed-loop control method effectively avoids the problem of uneven distribution of support reaction force caused by deviations in the height of the bearing pads in traditional solutions, ensuring that the structural stress of the completed bridge is completely consistent with the design, with high adjustment accuracy and controllable stress.

[0028] Fourth, this invention transforms traditional on-site manual wet work into factory-based, standardized mechanized operations. All components of the support system can be precision-machined and quality-tested in the factory, requiring only assembly on-site. Construction quality is unaffected by human factors such as on-site environmental conditions and operator skill levels, resulting in good product consistency and guaranteed quality. Simultaneously, by reducing on-site wet work, it also avoids potential quality issues during concrete curing, ensuring stable and reliable construction quality.

[0029] Fifth, the prefabricated adjustable height support system of this invention can be modularly designed and mass-produced as a standardized component. By adjusting the number and size parameters of the wedge blocks, it can be applied to rotating bridge projects with different spans and load levels. This standardized design not only reduces design and manufacturing costs but also facilitates rapid installation and interchangeability on the construction site. It is highly adaptable and standardized, and has broad engineering application prospects and promotional value.

[0030] Sixth, this invention retains the adjustable support height function before final locking. If deviations in alignment or reaction force are found during the commissioning phase, secondary adjustments can be made at any time until the design requirements are met before final locking. Furthermore, due to the use of welded steel structure locking, the overall rigidity and durability of the support system are guaranteed, reducing the workload of later operation and maintenance, and making subsequent maintenance convenient.

[0031] Seventh, although the initial manufacturing cost of the prefabricated adjustable bearing system is slightly higher than that of the traditional bearing pad scheme, considering the indirect benefits of shortened construction period, the safety cost savings due to reduced construction risks, and the reduced maintenance costs due to stable quality, the overall economic benefits of this invention are significantly better than those of existing technologies. Especially for bridge projects crossing busy traffic lines, the shortened construction period means less traffic interruption time under the bridge, resulting in more considerable socio-economic benefits and significant economic advantages. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the pre-installed adjustable height support system of the present invention before rotation; Figure 2 yes Figure 1 The diagram shown is a structural schematic of the embodiment after the beam rotation and lowering are completed. Figure 3 yes Figure 1 The illustrated embodiment is a structural diagram of the final locking and bridging process; Figure 4 This is a schematic diagram of the overall layout of the invention before the rotation of a rotating bridge. Figure 5 This is a schematic diagram of the overall layout of the invention applied to the construction of rotating bridges after the beams are lowered and the bridge is completed. In the diagram: 1-Spinning beam; 2-Side pier; 3-Embedded base; 4-Lower support plate; 5-Adjustable height core module; 5a-Upper wedge block; 5b-Lower wedge block; 5c-Horizontal drive device; 6-Upper support plate; 7-Support body; 8-Temporary locking mechanism; 9-Final locking mechanism; 10-Main pier; 11-Spinning system; 12-Existing traffic line. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments described below are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0034] The core technical idea of ​​this invention is as follows: before the rotation construction, a support system with height adjustment function is fully installed on the side pier and locked at a safe height to ensure that the beam can pass safely during the rotation process; after the rotation is in place, the support is precisely lifted to the design elevation through mechanical operation to complete the conversion of the force system.

[0035] Example 1: Wedge-shaped slider support system Reference Figures 1 to 2 The pre-installed adjustable height side span support system of this embodiment mainly consists of the following components: The embedded base 3 is a reinforced concrete structure, constructed concurrently with the pouring of the cap beam on top of the side pier 2. Anchors are precisely embedded in the top of the embedded base 3, extending a certain length beyond the top surface for subsequent fixation of the lower support plate 4. The elevation of the top surface of the embedded base 3 must be precisely controlled to ensure that the entire support system meets the requirements for safe rotation clearance after installation.

[0036] The lower support plate 4 is a thick steel plate with connection holes corresponding to the pre-embedded anchors. The lower support plate 4 is firmly fastened to the pre-embedded base 3 with nuts. The upper surface of the lower support plate 4 is precision machined to provide a flat sliding surface for the lower wedge block 5b.

[0037] The adjustable height core module 5 adopts a wedge-shaped slider assembly structure. The upper wedge block 5a is placed on the inclined surface of the lower wedge block 5b, with its top surface being horizontal to directly support the upper support plate 6. Its bottom has two symmetrical wedge-shaped inclined surfaces, the slope of which matches the upper surface of the lower wedge block 5b. The lower wedge block 5b is mounted on the lower support plate 4 and can slide freely in the horizontal direction. The upper surface of each lower wedge block 5b has an inclined surface that matches the slope of the bottom inclined surface of the upper wedge block 5a. When the lower wedge block 5b moves forward or backward in the horizontal direction, the wedge-shaped inclined surfaces cause the upper wedge block 5a, along with the upper support plate 6, to undergo corresponding lifting and lowering movements.

[0038] The horizontal drive device 5c employs a through-hole hydraulic jack, horizontally mounted on a dedicated bracket of the lower support plate 4, with its piston rod end connected to the lower wedge block 5b. The hydraulic jack is connected to the hydraulic control system via a dedicated oil pipe, enabling precise control of the horizontal displacement of the lower wedge block 5b. The hydraulic system is equipped with a pressure gauge, which monitors the jack's output force in real time, thereby calculating the support reaction force value.

[0039] The upper support plate 6 is a thick steel plate, the bottom surface of which contacts the top surface of the upper wedge block 5a. The top is provided with a support body 7, which is used to precisely connect with the beam bottom embedded parts at the bottom of the rotating beam 1 and transfer the load.

[0040] The temporary locking mechanism 8 consists of two or more adjusting screws. Before rotation, when the wedge-shaped slider assembly is at its lowest position, the adjusting screws are inserted into the positioning holes pre-set on the lower wedge block 5b, with the screws passing through the lower wedge block 5b. Locking nuts are provided at both ends of the adjusting screws; tightening the nuts temporarily locks the position of the wedge-shaped slider assembly, ensuring the stability of the support system during rotation. During the lifting and height adjustment phase, the adjusting screws can also be used for auxiliary adjustment and temporary pressure holding.

[0041] The final locking mechanism 9 consists of locking plates made of multiple thick steel plates; in this embodiment, four locking plates are used. After the beam height adjustment is completed and the support stress stability is confirmed, these locking plates are symmetrically arranged in the lateral gap between the upper support plate 6 and the lower support plate 4, and then firmly connected to the upper and lower support plates by welding. After welding, the entire support system is fixed into a rigid whole, completely eliminating the possibility of any future movement of the adjustable core module 5.

[0042] Example 2: Specific Implementation Steps of the Construction Method Reference Figure 4 and Figure 5 This embodiment details the complete method for constructing a rotating bridge using the aforementioned prefabricated adjustable height support system.

[0043] Step S1, Foundation Construction Stage Before Rotation: Construct the main pier 10 and side pier 2 according to the design drawings. During the construction of the cap beam of side pier 2, simultaneously pour the pre-embedded base 3, and precisely control the top elevation of the pre-embedded base 3 and the pre-embedded position of the anchors. Precision measuring instruments are used for positioning and verification during construction to ensure that all dimensional deviations are controlled within the design allowable range.

[0044] Step S2, Support System Installation and Locking Stage: After the concrete strength of the pre-embedded base 3 reaches the design requirements, first install the lower support plate 4 and secure it with anchors. Then, install the lower wedge block 5b, upper wedge block 5a, horizontal drive device 5c, and upper support plate 6 in sequence. After installation, operate the horizontal drive device 5c to retract the lower wedge block 5b to its travel limit position. At this point, the entire support system is at its lowest height, i.e., the rotation height. Then, insert the adjusting screw of the temporary locking mechanism 8 and tighten the locking nut to lock the wedge block assembly in this position. Finally, measure the top surface elevation of the upper support plate 6 to ensure it is lower than the design elevation of the bottom of the beam at the side span of the rotating beam 1, forming a rotation safety gap between them. The value of this rotation safety gap should be determined comprehensively based on the deflection calculation results of the rotating beam 1 and the actual site conditions, and is generally not less than 50 mm.

[0045] Step S3, Manufacturing Stage of the Rotating Beam: The rotating beam 1 is manufactured using a cast-in-place method with supports in a direction parallel to the bridge site. The rotating beam 1 of this invention is manufactured along its entire length, identical to the completed bridge, without any side span cast-in-place closure sections. This full-length manufacturing method not only simplifies the construction process but also avoids potential quality issues arising from the construction of the closure section. Embedded parts are pre-embedded at the side span support locations on the bottom of the rotating beam 1 for subsequent connection with the support body 7.

[0046] Step S4, Rotation Construction Stage: The rotation system 11 on the main pier 10 is activated, driving the rotating beam 1 to rotate smoothly around the main pier 10. During the rotation, the end of the side span of the rotating beam 1 safely passes over the locked side span support system. Because the support system is at its lowest rotation height and reliably locked, the designed rotation safety clearance is maintained between the end of the beam's side span and the top surface of the support at all times. The entire rotation process does not interfere with the existing traffic line 12 under the bridge, and no additional protective measures are required for the existing line.

[0047] Step S5, Side Span Support Height Adjustment Stage: After the rotating beam 1 is precisely positioned, the horizontal drive device 5c of all side span supports 2 is simultaneously activated. The hydraulic jack pushes the lower wedge block 5b forward horizontally, and through the action of the wedge-shaped inclined surface, the upper wedge block 5a, along with the upper support plate 6, is lifted upwards. During the lifting process, the lifting amount of the upper support plate 6 is monitored in real time by displacement sensors and compared with the pre-calculated value. When the displacement sensor shows that the lifting amount has reached the pre-calculated value, the hydraulic system pressure begins to rise significantly, and it is visually confirmed that the gap between the support body 7 at the top of the upper support plate 6 and the pre-embedded part at the bottom of the beam has been eliminated, it is determined that the support has been lifted into position and is in contact with the bottom of the beam.

[0048] After proper contact is achieved, continue operating the hydraulic system for precise pre-compression. Gradually increase the hydraulic pressure while observing the pressure gauge readings until the reaction force of each support reaches the design requirements. Once the design support reaction force is reached, lock the hydraulic system and install temporary locking nuts to maintain pressure. When coordinating the adjustment of each abutment support, multi-point synchronous jacking control technology is adopted. Through the synchronous distribution valve of the hydraulic control system, as well as the displacement sensors and pressure gauges of each support, synchronous monitoring and control of the jacking displacement and reaction force of each support are achieved, ensuring that each support is subjected to uniform force and that the reaction force value meets the design requirements.

[0049] Step S6, Final Locking and Bridge Completion Stage: After confirming that all side pier supports are stable under stress and that the reaction values ​​match the design, final locking is performed. Prefabricated locking plates are symmetrically arranged in the lateral gap between the upper support plate 6 and the lower support plate 4, and the locking plates are securely connected to the upper and lower support plates by welding. After welding, the entire support system is transformed into a permanent rigid support, and the adjustment function of the original adjustable core module 5 is completely eliminated. Subsequently, the bridge deck system and related ancillary facilities are constructed. After all construction is completed, the bridge can enter formal operation.

[0050] In summary, this invention, through its innovative pre-installed adjustable-height support system design, perfectly solves the technical challenges of constructing side-span supports for rotating bridges. This system completes all installation work before the rotation, allowing for precise adjustment of the support height and accurate control of the reaction force after rotation with only simple mechanical operations. Compared to existing technologies, this invention significantly improves construction safety and efficiency, ensures a high degree of consistency between the structural stress state and the design, and possesses significant engineering application value and broad market prospects.

[0051] The above are merely specific embodiments of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention. Any other aspects not described in detail are prior art.

Claims

1. A prefabricated adjustable height support system for a rotating bridge, characterized in that, Includes a pre-embedded base, a lower support plate, an adjustable core module, an upper support plate, and a locking device; The pre-embedded base is a reinforced concrete structure, which is cast and formed at the same time as the side pier cap beam before the rotation construction, and its top is pre-embedded with anchors for subsequent connection. The lower support plate is fixedly installed on the pre-embedded base by the anchor; The adjustable height core module is set on the lower support plate and is used to bear and transmit the load of the upper structure and can achieve stepless height adjustment in the vertical direction. The upper support plate is supported on the adjustable height core module, and its top is used to contact the pre-embedded part at the bottom of the rotating beam and transfer the load. The locking device includes a temporary locking mechanism and a final locking mechanism. The temporary locking mechanism is used to lock the adjustable core module at a preset rotation height position during the rotation process to ensure a safe rotation clearance. The final locking mechanism is used to solidify the entire support system into a rigid whole after the beam is lowered and the height is adjusted, so that it can work as a permanent support.

2. The prefabricated adjustable height support system for a rotating bridge according to claim 1, characterized in that, The adjustable height core module is a wedge-shaped slider assembly, including an upper wedge block, a lower wedge block, and a horizontal drive device; the lower wedge block is mounted on the lower support plate and can slide in the horizontal direction, and its upper surface is machined with an inclined wedge-shaped slope; the upper wedge block is placed on the slope of the lower wedge block, and its bottom is machined with a symmetrical slope that matches the slope of the upper surface of the lower wedge block, and its top surface is a horizontal surface that directly supports the upper support plate; The horizontal drive device is horizontally mounted on the bracket of the lower support plate, and its piston rod end is connected to the lower wedge block. The upper support plate is lifted and lowered in the vertical direction by pushing the lower wedge block to slide relative to it in the horizontal direction.

3. The prefabricated adjustable height support system for a rotating bridge according to claim 2, characterized in that, The horizontal drive device is a through-hole hydraulic jack, which is connected to a hydraulic control system. The pressure gauge of the hydraulic system can monitor the support reaction force in real time to ensure that it matches the design value.

4. The prefabricated adjustable height support system for a rotating bridge according to claim 2, characterized in that, The temporary locking mechanism includes at least two adjusting screws, which are inserted through positioning holes pre-set on the lower wedge block. Both ends of the adjusting screws are equipped with locking nuts. Temporary locking is achieved by locking the wedge block assembly to the lowest position before rotation.

5. The prefabricated adjustable height support system for a rotating bridge according to any one of claims 1 to 4, characterized in that, The final locking mechanism includes multiple locking plates made of thick steel plates. After the beam height adjustment is completed and the support is confirmed to be stable, the locking plates are symmetrically welded into the lateral gap between the upper support plate and the lower support plate, completely eliminating the possibility of movement of the adjustable core module and fixing the entire system into a rigid whole.

6. The prefabricated adjustable height support system for a rotating bridge according to claim 2, characterized in that, The wedge-shaped slider assembly includes one or more pairs of matching wedge blocks. In each pair of wedge blocks, the lower wedge block is connected to the lower support plate, and the upper wedge block is in contact with the upper support plate. Multiple pairs of wedge blocks work together to improve load-bearing capacity and adjustment stability.

7. The prefabricated adjustable height support system for a rotating bridge according to claim 6, characterized in that, The top of the upper support plate is also provided with a support body, which is used to precisely connect with the pre-embedded parts at the bottom of the rotating beam and transmit force.

8. A construction method using the prefabricated adjustable height support system according to any one of claims 2 to 7, characterized in that, Includes the following steps: S1: Construct the main pier and side pier according to the design requirements. Simultaneously pour the pre-embedded base when constructing the cap beam of the side pier, and accurately control the top surface elevation of the pre-embedded base and the pre-embedded position of the anchor. S2: After the concrete of the pre-embedded base reaches the design strength, install the lower support plate, lower wedge block, upper wedge block, horizontal drive device and upper support plate in sequence. Operate the horizontal drive device to make the lower wedge block retreat to the limit position so that the entire support system is at the lowest rotation height. Insert the temporary locking mechanism to lock it. Measure to ensure that the elevation of the top surface of the upper support plate is lower than the design elevation of the bottom of the beam at the side span of the rotating beam, thus forming a safe rotation gap. S3: A full-length rotating beam of the same length as the completed bridge is manufactured using the support casting method in a direction parallel to the bridge site. The rotating beam has no side span cast-in-place closure section. S4: Start the rotation system on the main pier to drive the rotating beam to rotate smoothly. During the rotation process, the end of the side span of the rotating beam passes safely over the locked side span support system and always maintains a safe rotation gap. S5: After the body is precisely positioned, the horizontal drive device on all the side pier supports is started simultaneously to push the lower wedge block forward. The lifting amount of the upper support plate is monitored in real time by the displacement sensor. After being lifted to contact the embedded part at the bottom of the beam, the support reaction force is precisely pre-pressed according to the design requirements. The pressure gauge of the hydraulic system is used to monitor and ensure that the support reaction force is consistent with the design value. S6: After confirming that all supports are under stable stress, weld the locking plate between the upper and lower support plates to completely eliminate the possibility of movement of the adjustable core module, and construct the bridge deck system and ancillary facilities to put the bridge into operation.

9. The construction method according to claim 8, characterized in that, In step S5, when coordinating the adjustment of each side pier support, a multi-point synchronous jacking control technology is adopted. The jacking displacement and reaction force of each support are monitored simultaneously through displacement sensors and pressure gauges of the hydraulic system to ensure that each support is subjected to uniform force and that the support reaction force reaches the design value.

10. The construction method according to claim 8, characterized in that, The criteria for determining when the jacking reaches contact with the embedded part at the bottom of the beam in step S5 include: the displacement sensor showing that the jacking amount has reached the pre-calculated value, the hydraulic system pressure starting to rise significantly, and the gap between the upper support plate and the embedded part at the bottom of the beam being eliminated; when performing precise preloading, the pressure is gradually loaded and the pressure gauge reading is observed until the designed support reaction force value is reached, then the hydraulic system is locked and a temporary locking nut is installed to maintain the pressure.

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