Synchronous swivel construction method and system for overpass railway double-width road swivel beam

Abstract

The invention discloses a synchronous swivel construction method and system for an overpass railway double-width road swivel beam. The synchronous swivel construction method and system are suitable for large-tonnage swivel construction and synchronous swivel construction of a double-width swivel T-shaped structure on a single-hole or multi-hole reinforced concrete bridge with a large span, wherein the overpass railway, the expressway, the river, the canyon and the like are spanned on the single-hole or multi-hole reinforced concrete bridge. By adopting a bridge swivel construction method and adopting a construction process of construction first and then swivel and synchronous swivel, pouring prefabrication is performed along the two sides of a railway respectively, and swivel construction is performed synchronously in the same direction. In the construction process, the driving safety of existing line facilities and railway running trains is ensured, meanwhile, the construction quality of the continuous beam is ensured, and it is ensured that the whole project engineering construction period is completed in advance.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a synchronous rotation construction method and system for a double-span highway rotation beam that crosses a railway. Background Art

[0002] With the rapid development of bridge construction technology, the increase in urban construction and passenger demand, when building urban overpasses and railway overpasses located in busy traffic, great attention is paid to train operation and driving safety. When crossing existing railway lines and busy trunk roads, the rotation method is used for construction, which can greatly reduce the impact on the driving and roads of existing railway lines. Without affecting the normal transportation of traffic and train operation, the rotation method has a simple construction process, fast speed, reliable safety, and the quality is relatively easy to control during construction. Through this method, the present invention successfully completes the synchronous rotation construction task of the double-width highway rotation beam, ensures the driving safety of existing line facilities and running trains, and achieves good economic and social benefits. Summary of the invention

[0003] The present application provides a method and system for synchronously rotating a double-span highway rotating beam across a railway, so as to solve the problem of synchronously rotating a double-span highway rotating beam.

[0004] According to the first aspect, an embodiment provides a method for synchronously rotating a rotating beam of a double-span highway across a railway, the method comprising: The first rotating mechanism and the second rotating mechanism of the double-span bridge are constructed on both sides of the railway line, and the corresponding rotating traction system is configured. The first rotating mechanism is used for the rotation of the left-span rotating bridge, and the second rotating mechanism is used for the rotation of the right-span rotating bridge. The first rotating mechanism and the second rotating mechanism both include an upper rotating plate, a lower rotating plate, and a ball joint system between the upper rotating plate and the lower rotating plate, and the ball joint system includes an upper ball joint and a lower ball joint. After the construction of the first rotating mechanism and the second rotating mechanism is completed, the left rotating bridge and the right rotating bridge are constructed respectively, including the pier body construction and the beam body construction; Before the formal rotation construction, the rotating bridge shall be weighed and weighed, equipment shall be installed and debugged, traction cable shall be pre-tightened, and trial rotation shall be carried out; The railway line was blocked and formal rotation construction was carried out. The rotation speed of the rotating bridge was controlled to keep the rotation speed of the two rotating bridges consistent, ensuring the synchronous rotation of the two rotating bridges, thereby realizing the synchronous rotation construction of the two rotating bridges. During the rotation process, the combination of drone data collection and BIM technology was used to accurately control the rotation operation; The posture of the beam is adjusted and positioned, the rotating mechanism is sealed after the rotation is completed, and the joint section of the beam is cast in situ.

[0005] Furthermore, the construction of the first rotating mechanism and the second rotating mechanism specifically includes: The construction process of the lower turntable of the swivel includes: Measure and lay out → Clear the bottom of the foundation pit of lower turntable / lower pedestal → Pour the concrete cushion layer of lower pedestal → Tie the steel bars of lower turntable / lower pedestal → Install the formwork of lower turntable / lower pedestal → Pour the first step concrete of lower turntable / lower pedestal → Install and adjust the lower ball joint bracket and slideway bracket → Accurately position and adjust → Fix the lower ball joint bracket and slideway bracket → Install, calibrate and fix the lower ball joint and slideway steel plate → Tie the steel bars at the bottom of the lower ball joint and slideway steel plate → Tie the steel bars of traction reaction seat and jack reaction seat → Pour the second step concrete of lower turntable / lower pedestal → Install the formwork of traction reaction seat and jack reaction seat → Pour the third step concrete of lower turntable → Install positioning pin and polytetrafluoroethylene slide plate of lower ball joint.

[0006] Furthermore, the construction of the first rotating mechanism and the second rotating mechanism specifically includes: The construction process of the turntable on the swivel includes: Apply lubricating grease to the top surface of the lower ball joint → install the upper ball joint → fine-tune and test run → tie the upper ball joint and the upper turntable disc steel bars, install the formwork → pour the fourth step upper turntable / upper pedestal concrete → tie the octagonal upper turntable steel bars, install the formwork → pour the fifth step upper turntable / upper pedestal concrete.

[0007] Furthermore, the construction of the first rotating mechanism and the second rotating mechanism specifically includes: The first step of concrete pouring of the foundation includes: According to the design drawings, a ball joint installation position is reserved on the top surface of the lower pedestal. The reserved position for ball joint installation is 1.35m below the design elevation of the top surface of the lower pedestal. At the reserved position 0.75m below the elevation of the lower pedestal top, vertical main reinforcement is embedded according to the pedestal reinforcement layout diagram. The horizontal reinforcement is tied according to the drawings. When tying the reinforcement, some reinforcements will be reserved in advance for the installation of the ball joint. After the ball joint is installed, the reinforcements at the reserved position will be filled. The first step of pouring is to pour 2.75m concrete at the lower turntable / lower pedestal height; after the concrete pouring is completed, install the lower ball joint positioning frame, slideway positioning frame, lower ball joint, and slideway steel plate; The second step of concrete pouring of the foundation includes: Before installing the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate, the project professional surveying personnel shall lay out the center position of the ball joint and make clear marks. After the installation is completed and the re-measurement accuracy meets the design requirements; the installation top elevation of the lower ball joint and annular slideway steel plate is 1cm above the top elevation of the lower turntable as the top elevation of the lower ball joint and slideway steel plate; After the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate are installed, tie the steel bars under the lower ball joint of the circular turntable and the annular slideway steel plate and install the outer template. At the same time, tie the steel bars of the jack reaction seat and the traction reaction seat. Pour the second step of concrete at a height of 1.35m below the lower ball joint of the circular turntable and the slideway steel plate. After the concrete pouring is completed, install the jack reaction seat and traction reaction seat template; In the second step, when pouring concrete, it is necessary to note that the top surface of the lower turntable / lower pedestal is 1 cm lower than the top surface of the lower ball joint and the top surface of the slideway to prevent rainwater from soaking the ball joint and the slideway; The third step of concrete pouring of the foundation includes: After the jack reaction seat and traction reaction seat templates are installed, pour the third concrete; after the jack reaction seat and traction reaction seat concrete pouring is completed, remove the template, clean the lower turntable and ball joint, and slideway surface, ensure that there is no debris between the lower ball joint surface and the installation of the polytetrafluoroethylene slide, and blow dry with a hair dryer; Apply butter to the Φ270mm steel rod of the rotating center pin and insert it into the reserved sleeve of the lower turntable, then apply butter to the top surface of the lower ball joint. After the butter application on the top surface of the lower ball joint is completed and inspected to be qualified, start installing the upper ball joint; Before installing the upper ball joint, check whether the contact surface between the upper ball joint and the lower ball joint is clean. If there is any debris, clean it up before installation. During the installation process, fine-tune the center position of the upper ball joint so that the center of the circle is centered after the upper ball joint is installed, and conduct a trial rotation for three to five weeks to make the butter between the upper and lower ball joints fully dense. Remove excess butter that is squeezed out and seal the outside with foam glue to ensure that impurities do not enter the friction surface.

[0008] Furthermore, the construction of the first rotating mechanism and the second rotating mechanism specifically includes: Install the turntable support legs and sand box, and the fourth step of concrete pouring of the foundation includes: The upper turntable is equipped with 8 sets of legs. Before the installation of the legs, the project technicians will lay out the center and edge positions of the legs on site, and the on-site installers will install the legs according to the laid-out positions; a 2cm thick layer of fine sand is laid under the legs as a reserved position for the installation of the polytetrafluoroethylene slide plate; pay attention to the angle of the legs during installation to ensure that the legs are located within the range of the slideway steel plate during the subsequent rotation process; to ensure the structural stability before rotation, 2 sand boxes are set between each set of legs according to the design requirements; Tie the disc steel bars and formwork of the upper turntable / upper pedestal with a height of 1.9m, and pour the fourth step of concrete after the tie-up and formwork of the disc steel bars and formwork of the upper turntable with a height of 1.9m are completed; The fifth step of concrete pouring of the foundation includes: After the remaining 2m high and 13.5m wide octagonal upper turntable / upper pedestal is tied with steel bars and the formwork is installed, the fifth step of concrete is poured.

[0009] Furthermore, the rotation traction system adopts the ZLD automatic continuous jacking system. The entire system is composed of three modular parts: the modular ZLD automatic continuous jacking jack, the ZLDB automatic continuous pumping station, and the ZLDK automatic continuous jacking control console. During the rotation construction, the traction rope is pulled by the jack to drive the upper turntable, and the upper ball joint rotates on the lower turntable along the center axis of the ball joint to finally realize the rotation.

[0010] Furthermore, the rotation process uses a combination of drone data collection and BIM technology to accurately control the rotation operation, including: The real-time tracking technology of UAVs and the real-time positioning technology of high-precision total stations are used to realize the visualization of three-dimensional coordinates, the real-time rotation position information and posture monitoring of the rotating bridge, and the real-time analysis of the geometric position data of the BIM model and the rotating bridge; The production model is produced by drone oblique photography, and based on the BIM data coordinate conversion and alignment, the CAD and drone real-scene three-dimensional models are accurately matched. By comparing the BIM simulation design plan with the real scene, the surrounding terrain and environment are judged, which facilitates the discussion and modification of the design plan.

[0011] Furthermore, the beam posture adjustment and positioning specifically include: When adjusting the posture, the beam line shape should be adjusted first, and then the beam elevation; Beam axis adjustment: The deviation of the beam axis is adjusted by the ZLD automatic continuous jacking jack point control method. The control point is prepared in advance at the beam end. When the beam axis approaches the design position, the automatic traction operation should be stopped to prevent over-rotation. The point control is adopted. The point control time is 10S once. Each time the point is moved, the measurement technician observes it until the beam axis rotates into place. Beam elevation adjustment: An attitude adjustment device is installed between the upper and lower turntables at the center of the turntables symmetrically on both sides of the axis of the rotating bridge. The YDCQ5500 / 52 split front card tensioning jack is used to adjust the tilt angle of the rotating bridge. On-site measurement technicians measure the elevation of the beam end, and through the analysis of the measured data, the lower end of the beam is lifted, and real-time observation is carried out during the lifting process until the design elevation is reached; After the posture adjustment is completed and the position is checked to be correct, the upper turntable should be permanently locked immediately. The torsional resistance of the temporary consolidation device should meet the needs of the rotation construction, and the sealing concrete should be poured in time.

[0012] Furthermore, the method further comprises: The measures adopted to prevent overspeed include: Before the rotation, the rotation angle dial is pasted on the upper turntable, and the cross reflective sticker is pasted on the center line of the beam end. The total station is used to measure the direction of the rotating bridge. The whole process of rotation is dynamically monitored to ensure the accurate positioning of the rotation. During the rotation construction, make corresponding records according to the rotation angle of the beam body, start jogging when the beam body is 5° away from the rotation angle, stop jogging when the beam body is 1° away from the rotation angle, and rely on the inertia of the beam body to rotate. Use 3cm wedge iron to tighten the support legs in time for reinforcement; During the rotation process, if the over-rotation is found during re-measurement due to rotational inertia or measurement error, a force couple boosting system consisting of two 200-ton jacks is used to push the support legs in the opposite direction to make the rotating body rotate back to the designed position; Set up the limit system: To prevent the beam from over-rotating, install a limit device on the slideway steel plate at the rotating position; the on-site measurement technicians measure the center line of the beam, and then use the measured distance from the axis to calculate the arc length corresponding to the circumference of the upper turntable support leg. The calculated length is measured on the slideway steel plate with a box ruler and marked, and 14# I-beams are fully welded at the marked positions.

[0013] According to the second aspect, an embodiment provides a synchronous rotation construction system for a double-span highway rotating beam over a railway, the system comprising: A swivel mechanism construction module, used to construct the first swivel mechanism and the second swivel mechanism of the double-span bridge on both sides of the railway line and configure the corresponding swivel traction system, wherein the first swivel mechanism is used for the swivel of the left-span swivel bridge, and the second swivel mechanism is used for the swivel of the right-span swivel bridge; The bridge construction module is used to carry out the construction of the left-span rotating bridge and the right-span rotating bridge respectively on the basis of completing the construction of the first rotating mechanism and the second rotating mechanism, including the pier body construction and the beam body construction; The pre-rotation construction module is used to carry out the rotating bridge weighing test, equipment installation and commissioning, traction cable pre-tightening work and trial rotation construction before the formal rotation construction; The rotation construction module is used to block the railway line and carry out formal rotation construction, control the rotation speed of the rotating bridge to keep the rotation speed of the two rotating bridges consistent, ensure the synchronous rotation of the two rotating bridges, and thus realize the synchronous rotation construction of the two rotating bridges. During the rotation process, the combination of drone data collection and BIM technology is used to accurately control the rotation operation; The post-rotation construction module is used to adjust and position the beam body posture. After the rotation is completed, the rotation mechanism is sealed and the beam body joint section is cast-in-place.

[0014] The present application provides a synchronous rotation construction method and system for a double-span highway rotating beam over a railway, which is suitable for large-tonnage rotation construction of single-span and multi-span reinforced concrete bridges over railways, highways, rivers, canyons, etc., as well as synchronous rotation construction of double-span rotating T-structures. It has the following beneficial effects: (1) The traction system rotation scheme is adopted to shorten the rotation time. The system is an automatic, continuous, and push-operated ZLDK rotation system. The system has the characteristics of good synchronization and balanced traction force, which can make the entire rotation process smooth; (2) The ZLD automatic continuous jacking system has the safety feature of 24V DC control. The whole system is composed of three modular parts: ZLD automatic continuous jacking jack, ZLDB automatic continuous pumping station, and ZLDK automatic continuous jacking control console. It is easy and fast to install on the construction site, with simple construction machinery, safe operation and easy to master; (3) During the rotation construction process, data collection and information feedback technology are applied to the rotation construction, and parameters such as linear monitoring and weighing and counterweight testing are used to guide the construction to ensure safe and fast construction; (4) The beam positioning accuracy requirement is high. The beam crosses busy lines and highways, and the line blockage construction time is short. The beam positioning fine adjustment adopts the method of sticking reflective cross stickers on the center line of the rotating beam end and using a high-precision total station to conduct real-time monitoring during the rotation process, which greatly shortens the fine adjustment time after the rotation is in place; (5) Use double-span synchronous rotation to avoid mutual influence between the two sections during double-span rotation, ensure simultaneous blocking of the line, and perform rotation synchronously, thus reducing the time required for blocking operations across the railway; (6) The unbalanced counterweight principle is adopted to ensure that the bridge legs are always under force during the rotation process, thus ensuring the stability of the rotation process; (7) Eight sets of support legs are used to provide effective guarantee for stable rotation during the rotation process, and the construction safety is high; (8) From the perspective of the rotation construction effect, the structure is reasonable, the overall stability is good, and it meets the mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A flowchart of a synchronous rotation construction method for a double-span highway rotating beam over a railway provided by one embodiment of the present invention; Figure 2 A schematic diagram of a spherical joint structure of a rotating body in a synchronous rotation construction method of a rotating beam of a double-span highway over a railway provided by an embodiment of the present invention; Figure 3 A structural diagram of a rotating mechanism in a synchronous rotating construction method for a rotating beam of a double-span highway over a railway provided by an embodiment of the present invention; Figure 4An overall construction process of a double-span T-shaped rigid frame rotating bridge in a synchronous rotating construction method of a double-span highway rotating beam over a railway provided by an embodiment of the present invention; Figure 5 An elevation view of a rotating structure in a synchronous rotating construction method for a rotating beam of a double-span highway over a railway provided by an embodiment of the present invention; Figure 6 A schematic diagram of the step-by-step casting of a rotating pier cap in a synchronous rotating construction method for a rotating beam of a double-span highway over a railway provided by an embodiment of the present invention; Figure 7 A schematic diagram of the arrangement of weighing jacks and testing instruments in a synchronous rotation construction method for a double-span highway rotating beam over a railway provided by one embodiment of the present invention; Figure 8 In a method for synchronously rotating a double-span highway rotating beam over a railway provided in one embodiment of the present invention, BIM technology is used to simulate a synchronously rotating construction animation of a double-span rotating T-structure; Fig. 9 In a synchronous rotation construction method of a double-span highway rotating beam over a railway provided by an embodiment of the present invention, before the double-span T-structure is rotated; Fig.10 A double-width T-beam is rotated into place in a synchronous rotation construction method of a double-width highway rotating beam over a railway provided by an embodiment of the present invention; Fig.11 A schematic diagram of the logical structure of a synchronous rotation construction system for a double-span highway rotating beam over a railway provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0017] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0018] The first embodiment of the present invention provides a synchronous rotation construction method for a double-span highway rotating beam over a railway. Figure 1 Provide detailed explanation.

[0019] like Figure 1 As shown, in step S100, the first rotating mechanism and the second rotating mechanism of the double-span bridge are constructed and the corresponding rotating traction system is configured on both sides of the railway line, wherein the first rotating mechanism is used for the rotation of the left-span rotating bridge, and the second rotating mechanism is used for the rotation of the right-span rotating bridge.

[0020] like Figure 1 As shown, in step S200, on the basis of completing the construction of the first rotating mechanism and the second rotating mechanism, the left-span rotating bridge and the right-span rotating bridge are constructed respectively, including the pier body construction and the beam body construction.

[0021] like Figure 1 As shown, in step S300, before the formal rotation construction, the rotating bridge weighing test, equipment installation and commissioning, traction cable pre-tightening work and trial rotation construction are carried out.

[0022] like Figure 1 As shown, in step S400, the railway line is blocked and formal rotation construction is carried out, the rotation speed of the rotating bridge is controlled to keep the rotation speeds of the two rotating bridges consistent, to ensure the synchronous rotation of the two spans, thereby realizing the synchronous rotation construction of the two span rotating bridges, and the rotation process is combined with UAV data collection + BIM technology to accurately control the rotation operation.

[0023] like Figure 1 As shown, in step S500, the posture of the beam body is adjusted and positioned, the rotating mechanism is sealed after the rotation is completed, and the joint section of the beam body is cast in situ.

[0024] The detailed description is given below.

[0025] 1. Process principle like Figure 2 As shown, the principle of the swivel is to set a ball joint sliding device with a small friction coefficient between the upper and lower structures of the swivel, and adopt a rotating system with a steel ball joint as the main central support and an annular slideway as the auxiliary support.

[0026] like Figure 3 As shown in the figure, the swivel structure consists of a swivel lower turntable, a ball joint, an upper turntable, a support leg, an annular slideway, a rotation traction system, etc. The lower ball joint is installed on the lower turntable, and the upper ball joint is fixed on the upper turntable. During the swivel construction, the jack pulls the traction rope to drive the upper turntable, and the upper ball joint rotates on the lower turntable along the central axis of the ball joint, finally realizing the swivel.

[0027] The double-span synchronous rotation construction method is based on the single-span rotation. The ZLD intelligent continuous jacking (rotation) system is used to start the double-span rotating beam synchronously, and the double-span traction line speed is controlled to ensure that the rotation angle and direction are consistent during the rotation construction process, so that the double-span rotations are not affected by each other during the rotation process and can rotate into place at the same time.

[0028] 2. Construction process and operation points 2.1 The overall construction process of the double-span T-shaped rigid frame rotating bridge is as follows Figure 4 shown.

[0029] 2.2 Key points of construction operation of rotating structure 2.2.1 Construction process of the lower turntable of the swivel: Measure and lay out → Clear the bottom of the foundation pit of the lower turntable (lower pedestal) → Pour the concrete cushion layer of the lower pedestal → Tie the steel bars of the lower turntable (lower pedestal) → Install the template of the lower turntable (lower pedestal) → Pour the first step of concrete for the lower turntable (lower pedestal) → Install and adjust the lower ball joint bracket and slideway bracket → Accurately position and adjust → Fix the lower ball joint bracket and slideway bracket → Install, accurately and fix the lower ball joint and slideway steel plate → Tie the steel bars at the bottom of the lower ball joint and slideway steel plate → Tie the steel bars of the traction reaction seat and jack reaction seat → Pour the second step of concrete for the lower turntable (lower pedestal) → Install the template of the traction reaction seat and jack reaction seat → Pour the third step of concrete for the lower turntable → Install the positioning pin and polytetrafluoroethylene slide of the lower ball joint 2.2.2 Construction process of the turntable on the swivel: Apply lubricating grease to the top surface of the lower ball joint → Install the upper ball joint → Fine-tune and test run → Tie the upper ball joint and the upper turntable disc steel bars, install the template → Pour the fourth step of upper turntable (upper pedestal) concrete → Tie the 13.5m wide octagonal upper turntable steel bars, install the template → Pour the fifth step of upper turntable (upper pedestal) concrete 1. First step of pouring concrete like Figure 5As shown in the figure, a ball joint installation position is reserved on the top surface of the lower pedestal according to the design drawing requirements, and a ball joint installation position is reserved 1.35m below the design elevation of the top surface of the lower pedestal (lower square pedestal + upper circular turntable). At the reserved position 0.75m below the elevation of the lower pedestal top, the vertical main reinforcement is embedded according to the pedestal reinforcement layout diagram, and the horizontal reinforcement is tied according to the drawing requirements. When tying the reinforcement, some reinforcements will be reserved in advance for the installation of the ball joint, and the reinforcements at the reserved position will be filled after the ball joint is installed.

[0030] In the first step of pouring, the height of the lower turntable (lower pedestal) is 2.75m concrete. After the concrete pouring is completed, the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate are installed.

[0031] 2. The second step of concrete pouring of the foundation Before installing the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate, the project professional surveyor will lay out the center position of the ball joint and make clear marks. After installation and re-measurement, the accuracy meets the design requirements. The top elevation of the lower ball joint and annular slideway steel plate is 1 cm above the top elevation of the lower turntable.

[0032] After the installation of the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate is completed, tie the steel bars under the circular turntable lower ball joint and the annular slideway steel plate and install the outer formwork. At the same time, tie the steel bars of the jack reaction seat and traction reaction seat. Pour the second step of concrete at a height of 1.35m below the circular turntable lower ball joint and slideway steel plate. After the concrete pouring is completed, install the jack reaction seat and traction reaction seat formwork.

[0033] When pouring concrete in the second step, it is necessary to note that the top surface of the lower turntable (lower pedestal) is 1 cm lower than the top surface of the lower ball joint and the top surface of the slide to prevent rainwater from soaking the ball joint and the slide.

[0034] 3. The third step of pouring concrete After the jack reaction seat and traction reaction seat templates are installed, pour the third concrete. After the jack reaction seat and traction reaction seat concrete pouring is completed, remove the template, clean the lower turntable and ball joint, and slideway surface, ensure that there is no debris between the lower ball joint surface and the installation of the polytetrafluoroethylene slide, and blow dry with a hair dryer.

[0035] Apply butter to the Φ270mm steel rod of the rotating center pin and insert it into the reserved sleeve of the lower turntable, then apply butter to the top surface of the lower ball joint. After the butter application on the top surface of the lower ball joint is completed and inspected and passed, start installing the upper ball joint.

[0036] Before installing the upper ball joint, check whether the contact surface between the upper ball joint and the lower ball joint is clean. If there is any debris, clean it up before installation. During the installation process, fine-tune the center position of the upper ball joint so that the center of the circle is centered after the upper ball joint is installed, and test-rotate it for three to five weeks to make the butter between the upper and lower ball joints fully dense. Remove the excess butter that is squeezed out, and seal the outside with foam glue to ensure that impurities do not enter the friction surface.

[0037] 4Install the turntable support legs and sand box, and pour concrete for the fourth step of the foundation The upper turntable is equipped with 8 sets of legs. Before the legs are installed, the project technicians will lay out the center and edge positions of the legs on site, and the on-site installers will install the legs according to the laid-out positions. A 2cm thick layer of fine sand is laid under the legs as a reserved position for the installation of the polytetrafluoroethylene slide. Pay attention to the angle of the legs during installation to ensure that the legs are located within the range of the slideway steel plate during the rotation process. To ensure the structural stability before rotation, two sand boxes are set between each set of legs according to the design requirements.

[0038] The upper turntable (upper pedestal) is tied with disc reinforcement of 1.9m in height and the formwork is installed. After the tying of the disc reinforcement of 1.9m in height and the installation of the formwork are completed, the fourth step of concrete is poured.

[0039] 5. The fifth step of the foundation is to pour concrete After the remaining 2m high and 13.5m wide octagonal upper turntable (upper bearing platform) is tied with steel bars and the formwork is installed, the fifth step of concrete pouring is completed. Figure 6 shown.

[0040] 2.2.3 Calculation of traction force and power reserve coefficient of rotating structure and equipment configuration 1 Calculation of traction and power reserve coefficient of rotating structure: The total weight of the rotating body G is 92000kN Calculation of rotational traction force: T=2fGR / 3D R is the radius of the ball joint plane, R=1.75m, D is the turntable diameter, D=11.5m, f is the friction coefficient of the ball joint, fstatic=0.1, fdynamic=0.06 Considering the influence of the contact between the support leg and the slide, and the support reaction force N of the support leg does not exceed 2000kN, then: T=2fGR / 3D+fNR / D N is the maximum support force of the support leg during rotation construction, N=2000kN, R is the rotation radius of the support leg, R=2.15m Calculation results: Maximum traction required for starting: T3=2fstatic GR / 3D+fstatic NR support / D=1023kN Required traction during rotation: T4=2f dynamic GR / 3D+f dynamic NR support / D=614kN Power reserve coefficient at start-up: K3=3500 / 1023=3.42 Power reserve coefficient when rotating: K4=3500 / 614=2.7 Meet the requirements.

[0041] 2 Rotation traction equipment configuration According to the calculation data of the traction force and power reserve coefficient of the rotating structure, the traction system of this bridge uses two 3500KN jacks and a synchronous automatic continuous traction system (the traction system consists of a continuous jack, a hydraulic pump station and a control console) to form a horizontal rotating force couple, and the rotating system rotates by pulling and anchoring 17 Φs12.2 steel strands wrapped around the 11.5m diameter turntable. The jack reaction seat uses two 3500KN jacks, which are arranged symmetrically.

[0042] 2.3 Key points of the construction of the rotating bridge 2.3.1 Remove the beam support, sand box, and clean up the debris between the upper and lower turntables 1 Remove all the supports of the beam body, then put sand in the 16 sand boxes between the upper and lower turntables and remove the sand boxes. When removing the sand boxes, pay attention to grouping and removing them symmetrically.

[0043] 2 Clean up the 2-3cm fine sand layer between the support foot and the slide steel plate, the surface of the slide steel plate, and the debris between the upper and lower turntables.

[0044] 2.3.2 Cleaning of rotating bridge Before the rotation construction, clean up the materials and tools on the rotating bridge and in the beam box room, otherwise it will increase the weight of the rotating structure and affect the weighing test results of the rotating structure.

[0045] 2.3.3 Weighing test 1 Before the weighing test of the rotating bridge, the construction of ancillary facilities such as the anti-collision wall and protective net above the beam should be completed to ensure the accuracy of the weighing test of the rotating beam.

[0046] 2 In order to ensure the stability of the rotation construction process, weighing tests and counterweighting are carried out using the principle of unbalanced counterweights, so that one end of the rotating bridge body is first approached by the railway side and slightly tilted. The eccentricity of the beam meets the requirement of 5cm≤e≤15cm, and the weighing and counterweighting test must be entrusted to a unit with relevant qualifications.

[0047] 3 The purpose of the counterweight is to make the rotating bridge reach a balanced state and improve the stability of the rotation process.

[0048] There are two commonly used counterweight schemes: the absolute balanced counterweight scheme for the beam and the longitudinally inclined counterweight scheme for the beam. The absolute balanced counterweight is actually not conducive to the stability of the rotation, so the longitudinally inclined counterweight scheme for the beam is adopted on site.

[0049] The idea of ​​this counterweight scheme is: concrete prefabricated blocks are used for weighing and counterweighting at the construction site. During the rotation process, the rotating beam should be slightly inclined in the direction of the beam axis, that is, the support leg on one side of the rotating beam axis is lowered to contact the slideway steel plate, and the support leg on the other side of the axis is raised to slightly leave the slideway steel plate. The advantages of this treatment are: the rotating beam forms two vertical support points, thereby increasing the stability of the rotating beam in the vertical plane during the rotation process; by using the longitudinal tilt counterweight of the beam body, the collision between the cantilever end of the rotating beam and the pier column passing through the rotation range during the rotation process is effectively solved, which greatly improves the safety of the rotation construction.

[0050] 4. Measurement point layout and equipment 1) Layout of test equipment: Estimation of the number of jacks: The rotation radius of the ball joint space is 7m, the distance between the BP14# pier jack and the rotation center is 2.15m, and the distance between the FP4# jack and the rotation center is 2.15m. Based on the static friction coefficient of similar projects and actual measured experience, two 500-ton jacks are required for jacking on each side.

[0051] Arrangement of vertical displacement sensor: An intelligent displacement meter is installed on the slideway on the opposite side of the jacking. Two displacement meters are arranged on the opposite side of the jacking (one for main use and one for standby verification). One vertical displacement meter is arranged at 90 degrees to the left and right of the jacking to monitor the changes in vertical displacement.

[0052] Horizontal displacement meter arrangement: Arrange one displacement meter in the horizontal direction on the opposite side of jacking to assist in judging the sliding state.

[0053] Weighing jack and testing equipment are arranged as follows Figure 7 shown.

[0054] 2) Actual investment in test equipment: Four 500t hydraulic jacks for applying lifting force; 2 pressure sensors, used to control the lifting force value; 4 vertical intelligent displacement meters, used to measure lifting displacement; 1 horizontal intelligent displacement meter, used to assist in determining the critical sliding state; 3 walkie-talkies and labor protection tools such as safety helmets.

[0055] 2.3.4 Layout of monitoring points for rotating bridge 1 Before the trial rotation construction, the centerline of the rotating bridge body shall be rechecked and measured according to the data provided by the design, and the centerline position of the beam end shall be marked with reflective stickers.

[0056] 2 During the formal rotation construction process, two groups of surveying technicians were arranged to conduct measurement and observation on the beams of the connecting sections of the two rotating bridges on both sides of the two rotating bridges.

[0057] 2.3.5 Reporting of the construction plan for the closure of the operating line 1. According to the overall construction progress of the rotating bridge on site and the expected rotation time, the rotation construction plan shall be reported to the relevant departments of the Railway Bureau one month in advance to determine the rotation construction time.

[0058] 2 One day before the rotation construction blockade point, in accordance with the relevant regulations and requirements of the Railway Bureau, the Railway Bureau Construction Office will organize all relevant units to hold a pre-construction preparation meeting.

[0059] 2.3.6 Installation and commissioning of rotating equipment Install the ZLD intelligent automatic continuous jacking jack, ZLDB automatic continuous pumping station, ZLDK automatic continuous jacking console and other rotating power equipment. Connect the main console and pumping station with 12-core solenoid valve cable and 4-core pressure sensor cable. Connect the main console and jack with 10-core proximity switch cable. The main console and pumping station are connected to three-phase 380V power supply and the casing is reliably grounded. After installation, conduct a trial run to check whether the equipment is running normally and whether the console signal and data transmission are smooth and good.

[0060] 2.3.7 Pre-tightening of traction rope The reserved traction rope steel strands are arranged in sequence along the traction direction, wound on the upper turntable and passed through the ZLD intelligent automatic continuous jacking jack. Then, each steel strand in the traction rope is pre-tightened one by one by using the manually operated YDC240QX prestressed single tensioning jack. Finally, the ZLD intelligent automatic continuous jacking jack is activated to pre-tighten the entire bundle of traction rope steel strands under 2Mpa oil pressure, so that each steel strand in the same bundle of traction ropes has the same holding force.

[0061] 2.3.8 Trial rotation 5° construction Before the formal rotation construction, the rotating bridge should be tested for 5°. Before the trial rotation, the concrete strength of the rotating bridge body must reach the design strength before the trial rotation of the bridge can be implemented. Through the trial rotation, real-time detection of key stress-bearing parts such as ball joints, upper and lower turntables, and slideways to see if there are cracks and other abnormalities. If problems are found, stop the trial rotation in time, and only after the problems are completely eliminated can the rotation construction be carried out. At the same time, during the trial rotation construction, measure the starting traction force to see if a boost is needed. Measure the traction force of the normal rotation. Measure the inching distance at different times, etc. Collect necessary information for the formal rotation.

[0062] 1 During the trial run, the following data should be tested and collected: 1) During rotation, measure the angle of the main bridge rotating per minute and the horizontal chord distance of the cantilever end so as to control the rotation speed within the design requirements.

[0063] 2) The measurement team should measure the horizontal chord distance that the cantilever end rotates each time it moves, so as to provide an operational basis for precise positioning after the rotation is initially in place.

[0064] 2 During the trial run, check whether the rotating structure is balanced and stable, whether there are any faults, and whether there are cracks in the key stress-bearing parts. If there are any abnormalities, stop the test run, find out the cause and take corresponding measures to rectify it before continuing the trial run. After the trial run is completed, use wedge blocks to fix the support legs.

[0065] 2.3.9 Formal Transformation 1 Formal rotation construction 1) After all the work is ready, the weather conditions meet the requirements, and the personnel of the automatic continuous rotation jack, pump station, control console, and command and control console are in place, the rotation personnel will start the power system equipment after receiving the rotation order from the commander-in-chief, and make it run in the "automatic" state. The forces of the symmetrical jacks used in each rotation are always equal in magnitude and opposite in direction to ensure that the upper turntable only bears the dynamic couple balanced with the friction torque, and no overturning torque is generated.

[0066] 2) The operation method is the same as the construction method of trial rotation of 5°. When an abnormal situation occurs, press the "auto stop" or "emergency stop" button to stop the ongoing operation and continue to operate after the abnormality is eliminated.

[0067] 3) The staff at each inspection point monitors the displacement of the observation base point, ball joint, slideway, and support feet set on the bridge in real time, and promptly reports any abnormalities to the control console. The general control personnel shall immediately order the rotation construction to be stopped. During the operation of the equipment, the personnel at each post must pay close attention and always pay attention to observe and monitor the operation of the power system equipment and various parts of the rotation. If an abnormal situation occurs, the equipment must be shut down immediately for processing, and the equipment can be restarted to continue operation only after the hidden dangers are completely eliminated.

[0068] 4) Within 2m before the central axis of the two ends of the bridge deck is closed, the staff at the monitoring point begins to report the monitoring data to the control console in countdown, reporting once every 10cm; within 30cm, reporting once every 1cm; so that the operators of the control system can grasp the rotation situation in time, which is conducive to operating the control system and making the rotation meet the design requirements.

[0069] 5) The axis deviation is mainly adjusted by continuous jack point control. According to the test results, the stroke of each jack point is determined and converted into the beam end stroke. After each point operation, the surveyor measures and reports the current status of the axis once, and repeats the cycle until the axis of the rotating bridge is accurately in place.

[0070] 6) Lock the beam body and rotate it. After accurately measuring the plane position and elevation and finding that they are in line with the designed position, immediately use steel wedges to wedge the four corners of the support leg. At the same time, use 14# I-beams to weld the running steel plates at the bottom of the support leg to temporarily lock the beam body.

[0071] 2 Calculation of rotation time and traction speed The design requires an angular velocity of 0.02 rad / min, which is approximately 1.15° / min.

[0072] Calculated based on the ramp rotating bridge with the maximum rotation angle of 66°C (including the trial rotation angle), the rotation time T = 66° / 1.15° = 57.4min. That is, the theoretical rotation time is about 60min.

[0073] According to the design speed, the traction speed V1=ωr1=0.02×2.75=0.115m / min=3.9m / h. When the traction speed reaches 3.9m / h, the linear speed of the cantilever end of the bridge is V2=ωr2=0.02×65=1.3m / min.

[0074] The linear speed of the cantilever end of the bridge body that meets the specification requirements shall not exceed 1.5m / min.

[0075] 2.3.10 Control measures for synchronous rotation of double-width T-frame 1) There is an operator at each control console on the north and south sides of the railway. The two rotating T-structures use two sets of hydraulic equipment of the same model and specification. The nominal oil pressure of the jacks is the same. The pressure of the oil pressure gauge is controlled during the rotation. Before the rotation, the rotation angle dial is pasted on the upper turntable. During the rotation, the rotation scales of the two turntables are observed in real time to see if they are consistent.

[0076] The two bridges started the ZLDK automatic continuous jacking control console synchronously and communicated in real time using walkie-talkies. The main console controlled the traction speed of the continuous traction jack and the rotation speed of the T-beam to keep the rotation speed of the two T-beams consistent, thus ensuring the synchronous rotation of the two T-beams and finally achieving the synchronous positioning of the two T-beams.

[0077] 2) During the rotation process, the combination of "UAV data collection + BIM technology" is used to accurately control the rotation operation. This method uses the real-time tracking technology of drones and the real-time positioning technology of high-precision total stations to realize the visualization of three-dimensional coordinates, the real-time rotation position information and posture monitoring of the rotating bridge, and the real-time analysis of the geometric position data of the BIM model and the rotating bridge. Achieve full control of the whole process to ensure the accuracy and safety of the rotation process. Use BIM technology to simulate the construction animation of the synchronous rotation of the double-span rotating T-structure, such as Figure 8 shown.

[0078] The production model is produced by drone oblique photography, and based on the BIM data coordinate conversion and alignment, the CAD and drone real-scene three-dimensional models are accurately matched. The comparison between the BIM simulation design plan and the real scene can be clearly seen, and the surrounding terrain and environment can be judged, which facilitates the discussion and modification of the design plan.

[0079] 2.3.11 Beam posture adjustment and positioning 1) When adjusting the posture, the beam line shape should be adjusted first, and then the beam elevation should be adjusted.

[0080] 2) Beam axis adjustment The deviation of the beam axis is mainly adjusted by the ZLD automatic continuous jacking jack point control method. The control point is prepared in advance at the beam end. When the beam axis approaches the design position, in order to prevent over-rotation, the automatic traction operation should be stopped and the point control should be adopted. The point control time is 10S once. Each time the point is moved, the measurement technician observes it until the beam axis rotates into place.

[0081] 3) Beam elevation adjustment An attitude adjustment device (YDCQ5500 / 52 split front cardan tensioning jack) is installed between the upper and lower turntables at the center of the turntables symmetrically on both sides of the axis of the rotating bridge. The YDCQ5500 / 52 split front cardan tensioning jack is used to adjust the inclination angle of the rotating T-structure. The on-site measurement technicians measure the elevation of the beam end and lift the lower end of the beam through analysis of the measured data. Real-time observation is carried out during the lifting process until the designed elevation is reached.

[0082] 4) After the posture adjustment is completed, the position should be checked to be correct, and the upper turntable should be permanently locked immediately. The torsional resistance of the temporary consolidation device should meet the needs of the rotation construction, and the sealing concrete should be poured in time.

[0083] 2.3.12 Measures to prevent overspeed 1 Before rotation, paste the rotation angle dial on the upper turntable, and paste a cross reflective sticker on the center line of the beam end. Use a total station to measure the direction of the rotating bridge. Perform full dynamic monitoring during the rotation process to ensure that the rotation is accurately positioned.

[0084] 2 During the rotation construction, make corresponding records according to the rotation angle of the beam, start inching when it is 5° away from the corner, stop inching when it is 1° away from the corner, rely on the inertia of the beam to rotate, and use 3cm wedge iron to wedge and reinforce the support legs in time.

[0085] 3. If over-rotation is found during re-measurement due to rotational inertia or measurement error during the rotation process, a couple boosting system consisting of two 200-ton jacks can be used to push the support legs in the opposite direction to make the rotating body rotate back to the designed position.

[0086] 4 Limiting system To prevent the beam from over-rotating, a limit device is installed on the slideway steel plate where the rotation is located. On-site measurement technicians measure the center line of the beam, and then use the measured distance from the axis value to calculate the arc length corresponding to the circumference of the upper turntable support leg. The calculated length is measured on the slideway steel plate with a box ruler and marked. 14# I-beam is fully welded at the marked position.

[0087] 2.3.13 Sealing of the upper and lower turntables 1After the rotation is completed, seal the upper and lower turntables. Extend the steel bars reserved in advance for the upper and lower turntables and weld them together. After welding, install the side formwork on the outside of the turntable and pour concrete.

[0088] 2 In order to ensure the density of the upper and lower turntables after the sealing concrete is poured, a Φ15cm grouting hole is reserved in advance on the top of the upper turntable during construction. After the sealing concrete between the upper and lower turntables solidifies, the grouting method is used to fill the gap caused by concrete shrinkage, thereby ensuring the density of the sealing concrete between the upper and lower turntables after pouring.

[0089] 3. Materials and equipment 3.1 Traction system equipment composition Table 3.1-1: Composition of traction system equipment (double pier rotation, two groups of 4 piers)

[0090] Application examples: When the S43 Hohhot Airport Expressway Shibugeng Interchange Crossing Tangbao Railway Overpass Project crosses the Tangbao Railway trunk line, how to ensure the safety of existing line facilities and running trains during construction is a major problem. The S43 Hohhot Airport Expressway Shibugeng Interchange Crossing Tangbao Railway Overpass Project is located between Hohhot South Station and Shaliang Station. The railway mileage is from K875m+900m to K875m+300m on the Tangbao Up and Down Lines. The designed road intersection angles with the Tangbao Railway are 62°, 114.2°, 120.5°, and 59° respectively. The rotation angles are 62°, 66°, 59°, and 59° respectively, and a total of 2 tracks are crossed. The cross-line rotating bridge structure adopts: one 2×62m T-shaped rigid frame continuous beam plus three 2×70m T-shaped rigid frame continuous beams, with bridge lengths of 124m, 140m, 140m, and 140m, respectively. The bridge width is 13.3m, the height is 18m, and the weight of the four rotating beams is about 36,000 tons. The rotating angle, span, and weight are large. In addition, the Tangbao Railway is a national railway Class I, a trunk railway, with an average of one train passing every 3-5 minutes. It is a double-track electrified railway. The railway roadbed filling height in the construction section is about 4.5m. During the rotation process, the minimum crossing distance between the bottom of the beam and the contact network support is 1.57m. Communication and signal optical cables are installed on both sides of the railway roadbed slope foot. There are Tangbao through-line and self-closing lines at the foot of the line near the bridge. The safety risk of operating line construction is extremely high. In order to reduce the impact on railway transportation when the Tangbao line trains are not interrupted, the synchronous rotation construction technology of the double-span highway rotating beams across the railway is adopted to ensure the normal operation of the running trains. Before and after rotation Fig. 9 and Fig.10 shown.

[0091] During the construction of the continuous beam across the Tangbao Railway on the S43 Hohhot Airport Expressway project, the bridge rotation construction method was adopted, and the construction technology of "build first and then rotate" and "synchronous rotation" was adopted. The precasting was carried out on both sides of the railway, and the rotation construction was carried out synchronously and in the same direction. During the construction process, the driving safety of the existing line facilities and railway running trains was ensured, while the construction quality of the continuous beam was guaranteed, and the overall project construction period was ensured to be completed ahead of schedule.

[0092] This construction method combines the actual construction process and explores the application of the rotation construction of the railway overpass on the highway to achieve the synchronous rotation of the double spans across the railway under complex environmental conditions. On the basis of summary and analysis, a new application of the traditional construction technology of the railway overpass was made, forming a safer and more reliable construction process, providing valuable experience for similar projects so that it can be promoted and improved in future projects.

[0093] Corresponding to the above-disclosed synchronous rotation construction method of a double-span highway swivel beam over a railway, the embodiment of the present invention further discloses a synchronous rotation construction system for a double-span highway swivel beam over a railway, such as Fig.11As shown, it specifically includes: A swivel mechanism construction module, used to construct the first swivel mechanism and the second swivel mechanism of the double-span bridge on both sides of the railway line and configure the corresponding swivel traction system, wherein the first swivel mechanism is used for the swivel of the left-span swivel bridge, and the second swivel mechanism is used for the swivel of the right-span swivel bridge; The bridge construction module is used to carry out the construction of the left-span rotating bridge and the right-span rotating bridge respectively on the basis of completing the construction of the first rotating mechanism and the second rotating mechanism, including the pier body construction and the beam body construction; The pre-rotation construction module is used to carry out the rotating bridge weighing test, equipment installation and commissioning, traction cable pre-tightening work and trial rotation construction before the formal rotation construction; The rotation construction module is used to block the railway line and carry out formal rotation construction, control the rotation speed of the rotating bridge to keep the rotation speed of the two rotating bridges consistent, ensure the synchronous rotation of the two rotating bridges, and thus realize the synchronous rotation construction of the two rotating bridges. During the rotation process, the combination of drone data collection and BIM technology is used to accurately control the rotation operation; The post-rotation construction module is used to adjust and position the beam body posture. After the rotation is completed, the rotation mechanism is sealed and the beam body joint section is cast-in-place.

[0094] It should be noted that, for the detailed description of the synchronous rotation construction system of a double-span highway rotating beam over a railway provided in an embodiment of the present invention, reference can be made to the relevant description of the synchronous rotation construction method of a double-span highway rotating beam over a railway provided in an embodiment of the present application, which will not be repeated here.

[0095] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A synchronous rotation construction method for a double-span highway rotating beam over a railway, characterized in that: The method comprises: The first rotating mechanism and the second rotating mechanism of the double-span bridge are constructed on both sides of the railway line, and the corresponding rotating traction system is configured. The first rotating mechanism is used for the rotation of the left-span rotating bridge, and the second rotating mechanism is used for the rotation of the right-span rotating bridge. The first rotating mechanism and the second rotating mechanism both include an upper rotating plate, a lower rotating plate, and a ball joint system between the upper rotating plate and the lower rotating plate, and the ball joint system includes an upper ball joint and a lower ball joint. After the construction of the first rotating mechanism and the second rotating mechanism is completed, the left rotating bridge and the right rotating bridge are constructed respectively, including the pier body construction and the beam body construction; Before the formal rotation construction, the rotating bridge shall be weighed and weighed, equipment shall be installed and debugged, traction cable shall be pre-tightened, and trial rotation shall be carried out; The railway line was blocked and formal rotation construction was carried out. The rotation speed of the rotating bridge was controlled to keep the rotation speed of the two rotating bridges consistent, ensuring the synchronous rotation of the two rotating bridges, thereby realizing the synchronous rotation construction of the two rotating bridges. During the rotation process, the combination of drone data collection and BIM technology was used to accurately control the rotation operation; The posture of the beam is adjusted and positioned, the rotating mechanism is sealed after the rotation is completed, and the joint section of the beam is cast in situ.

2. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 1, characterized in that: The construction of the first rotating mechanism and the second rotating mechanism specifically includes: The construction process of the lower turntable of the swivel includes: Measure and lay out → Clear the bottom of the foundation pit of lower turntable / lower pedestal → Pour the concrete cushion layer of lower pedestal → Tie the steel bars of lower turntable / lower pedestal → Install the formwork of lower turntable / lower pedestal → Pour the first step concrete of lower turntable / lower pedestal → Install and adjust the lower ball joint bracket and slideway bracket → Accurately position and adjust → Fix the lower ball joint bracket and slideway bracket → Install, calibrate and fix the lower ball joint and slideway steel plate → Tie the steel bars at the bottom of the lower ball joint and slideway steel plate → Tie the steel bars of traction reaction seat and jack reaction seat → Pour the second step concrete of lower turntable / lower pedestal → Install the formwork of traction reaction seat and jack reaction seat → Pour the third step concrete of lower turntable → Install positioning pin and polytetrafluoroethylene slide plate of lower ball joint.

3. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 2, characterized in that: The construction of the first rotating mechanism and the second rotating mechanism specifically includes: The construction process of the turntable on the swivel includes: Apply lubricating grease to the top surface of the lower ball joint → install the upper ball joint → fine-tune and test run → tie the upper ball joint and the upper turntable disc steel bars, install the formwork → pour the fourth step upper turntable / upper pedestal concrete → tie the octagonal upper turntable steel bars, install the formwork → pour the fifth step upper turntable / upper pedestal concrete.

4. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 2, characterized in that: The construction of the first rotating mechanism and the second rotating mechanism specifically includes: The first step of concrete pouring of the foundation includes: According to the design drawings, reserve a ball joint installation position on the top surface of the lower cap, and set a preset distance downward from the design elevation of the top surface of the lower cap as the reserved position for ball joint installation; at the reserved position at the preset distance downward from the top elevation of the lower cap, embed the vertical main reinforcement according to the cap reinforcement layout diagram, and tie the horizontal reinforcement according to the drawings. When tying the reinforcement, reserve some reinforcement for the ball joint installation position in advance, and fill the reinforcement at the reserved position after the ball joint is installed; In the first step, pour concrete of the preset height of the lower turntable / lower pedestal; after the concrete pouring is completed, install the lower ball joint positioning frame, slideway positioning frame, lower ball joint, and slideway steel plate; The second step of concrete pouring of the foundation includes: Before installing the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate, the project professional surveying personnel shall lay out the center position of the ball joint and make clear marks. After installation and re-measurement, the accuracy shall meet the design requirements. The upper preset distance from the lower turntable top elevation to the lower ball joint and slideway steel plate top elevation; After the lower ball joint positioning frame, slideway positioning frame, lower ball joint and slideway steel plate are installed, tie the steel bars under the lower ball joint of the circular turntable and the annular slideway steel plate and install the outer template. At the same time, tie the steel bars of the jack reaction seat and the traction reaction seat. Pour the concrete of the preset height under the lower ball joint of the circular turntable and the slideway steel plate in the second step. After the concrete pouring is completed, install the jack reaction seat and traction reaction seat template; In the second step, when pouring concrete, it is necessary to pay attention to the preset distance below the top surface of the lower turntable / lower pedestal than the top surface of the lower ball joint and the top surface of the slideway to prevent rainwater from soaking the ball joint and the slideway; The third step of concrete pouring of the foundation includes: After the jack reaction seat and traction reaction seat templates are installed, pour the third concrete; after the jack reaction seat and traction reaction seat concrete pouring is completed, remove the template, clean the lower turntable and ball joint, and slideway surface, ensure that there is no debris between the lower ball joint surface and the installation of the polytetrafluoroethylene slide, and blow dry with a hair dryer; Apply grease to the steel rod of the rotating center pin and insert it into the reserved sleeve of the lower turntable, then apply grease to the top surface of the lower ball joint. After the grease is applied to the top surface of the lower ball joint and it is inspected and qualified, start to install the upper ball joint; Before installing the upper ball joint, check whether the contact surface between the upper ball joint and the lower ball joint is clean. If there is any debris, clean it up before installation. During the installation process, fine-tune the center position of the upper ball joint so that the center of the circle is centered after the upper ball joint is installed, and conduct a trial rotation for three to five weeks to make the butter between the upper and lower ball joints fully dense. Remove excess butter that is squeezed out and seal the outside with foam glue to ensure that impurities do not enter the friction surface.

5. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 3, characterized in that: The construction of the first rotating mechanism and the second rotating mechanism specifically includes: Install the turntable support legs and sand box, and the fourth step of concrete pouring of the foundation includes: The upper turntable is equipped with multiple sets of legs. Before the legs are installed, the project technicians will lay out the center and edge positions of the legs on site, and the on-site installers will install the legs according to the laid-out positions. A layer of fine sand is laid under the legs as a reserved position for the installation of the polytetrafluoroethylene slide. During installation, pay attention to the angle of the legs to ensure that the legs are located within the range of the slideway steel plate during the subsequent rotation process. To ensure the structural stability before rotation, multiple sand boxes are set between each set of legs according to design requirements. Tie up the disc reinforcement and formwork of the preset height of the upper turntable / upper pedestal. After the tie up of the disc reinforcement and formwork of the preset height of the upper turntable are completed, pour the fourth step of concrete; The fifth step of concrete pouring of the foundation includes: After the octagonal upper turntable reinforcement and formwork installation of the remaining preset height and width of the upper turntable / upper pedestal are completed, the fifth step of concrete pouring is completed.

6. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 1, characterized in that: The rotation traction system adopts the ZLD automatic continuous jacking system. The whole system is composed of three modular parts: the modular ZLD automatic continuous jacking jack, the ZLDB automatic continuous pumping station, and the ZLDK automatic continuous jacking control console. During the rotation construction, the traction rope is pulled by the jack to drive the upper turntable, and the upper ball joint rotates on the lower turntable along the center axis of the ball joint to finally realize the rotation.

7. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 1, characterized in that: During the rotation process, drone data collection + BIM technology are combined to accurately control the rotation operation, including: The real-time tracking technology of UAVs and the real-time positioning technology of high-precision total stations are used to realize the visualization of three-dimensional coordinates, the real-time rotation position information and posture monitoring of the rotating bridge, and the real-time analysis of the geometric position data of the BIM model and the rotating bridge; The production model is produced by drone oblique photography, and based on the BIM data coordinate conversion and alignment, the CAD and drone real-scene three-dimensional models are accurately matched. By comparing the BIM simulation design plan with the real scene, the surrounding terrain and environment are judged, which facilitates the discussion and modification of the design plan.

8. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 1, characterized in that: Beam posture adjustment and positioning, including: When adjusting the posture, the beam line shape should be adjusted first, and then the beam elevation; Beam axis adjustment: The deviation of the beam axis is adjusted by the ZLD automatic continuous jacking jack point control method. The control point is prepared in advance at the beam end. When the beam axis approaches the design position, the automatic traction operation should be stopped and point control should be adopted to prevent over-rotation. After each point control, the measurement technicians will observe it until the beam axis rotates into place. Beam elevation adjustment: An attitude adjustment device is installed between the upper and lower turntables at the center of the turntables symmetrically on both sides of the axis of the rotating bridge. The split front card tensioning jack is used to adjust the inclination angle of the rotating bridge. On-site measurement technicians measure the elevation of the beam end, and through the analysis of the measured data, the lower end of the beam is lifted, and real-time observation is carried out during the lifting process until the designed elevation is reached; After the posture adjustment is completed and the position is checked to be correct, the upper turntable should be permanently locked immediately. The torsional resistance of the temporary consolidation device should meet the needs of the rotation construction, and the sealing concrete should be poured in time.

9. The synchronous rotation construction method of a double-span highway rotating beam over a railway as claimed in claim 1, characterized in that: The method further comprises: The measures adopted to prevent overspeed include: Before the rotation, the rotation angle dial is pasted on the upper turntable, and the cross reflective sticker is pasted on the center line of the beam end. The total station is used to measure the direction of the rotating bridge. The whole process of rotation is dynamically monitored to ensure the accurate positioning of the rotation. During the rotation construction, make corresponding records according to the rotation angle of the beam body, start jogging when the distance from the rotation angle is 5°, stop jogging when the distance from the rotation angle is 1°, rely on the inertia of the beam body to rotate, and use wedge iron to tighten the support feet in time for reinforcement; During the rotation process, if the over-rotation is found during re-measurement due to rotational inertia or measurement error, a force couple boosting system consisting of multiple jacks is used to push the support legs in the opposite direction to make the rotating body rotate back to the designed position; Set up a limit system: To prevent the beam from over-rotating, a limit device is installed on the slideway steel plate at the rotating position; the on-site measurement technicians measure the center line of the beam, and then use the measured distance from the axis to calculate the arc length corresponding to the circumference of the upper turntable support leg. The calculated length is measured on the slideway steel plate with a box ruler and marked, and an I-beam is fully welded at the marked position.

10. A synchronous rotation construction system for a double-span highway rotating beam over a railway, characterized in that: The system comprises: A swivel mechanism construction module, used to construct the first swivel mechanism and the second swivel mechanism of the double-span bridge on both sides of the railway line and configure the corresponding swivel traction system, wherein the first swivel mechanism is used for the swivel of the left-span swivel bridge, and the second swivel mechanism is used for the swivel of the right-span swivel bridge; The bridge construction module is used to carry out the construction of the left-span rotating bridge and the right-span rotating bridge respectively on the basis of completing the construction of the first rotating mechanism and the second rotating mechanism, including the pier body construction and the beam body construction; The pre-rotation construction module is used to carry out the rotating bridge weighing test, equipment installation and commissioning, traction cable pre-tightening work and trial rotation construction before the formal rotation construction; The rotation construction module is used to block the railway line and carry out formal rotation construction, control the rotation speed of the rotating bridge to keep the rotation speed of the two rotating bridges consistent, ensure the synchronous rotation of the two rotating bridges, and thus realize the synchronous rotation construction of the two rotating bridges. During the rotation process, the combination of drone data collection and BIM technology is used to accurately control the rotation operation; The post-rotation construction module is used to adjust and position the beam body posture. After the rotation is completed, the rotation mechanism is sealed and the beam body joint section is cast-in-place.

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