A cast-in-situ beam swivel method across an existing railway

Abstract

This invention discloses a method for rotating a cast-in-place beam across an existing railway. A rotation system and a monitoring device are installed simultaneously on the pier. After the rotation system and monitoring device are installed, the cast-in-place beam is constructed above the rotation system. The rotation system is then driven to rotate the cast-in-place beam to a preset angle. During the rotation, the rotation angle of the cast-in-place beam is monitored by the monitoring device. This invention monitors the rotation angle of the cast-in-place beam using a monitoring device. Compared to traditional rotation construction methods, it eliminates the need for measuring and calculating the rotation angle using a total station and level during the rotation process, saving time and labor, and ensuring the safety of construction personnel.

Description

Technical Field

[0001] This invention relates to the field of rotating beam construction. More specifically, this invention relates to a method for rotating a cast-in-place beam that crosses an existing railway. Background Technology

[0002] Currently, bridge component rotation construction technology is mostly used for crossing existing railway lines. It has strict requirements for safety management of existing line construction, and the approval process is relatively complicated. Construction must be completed within a given time, otherwise it will affect the transportation safety of the existing railway line.

[0003] Traditional bridge rotation construction precision control involves technicians first using a total station and level to measure and calculate the rotated bridge components, and then notifying on-site personnel to make point-control adjustments to the beam. This method requires a lot of time for measurement and calculation, and technicians need to carry measuring instruments onto the bridge and into the existing railway line, which poses certain safety hazards. It also has the disadvantages of slow beam adjustment measurement, high labor and effort, high construction costs, and poor safety. Summary of the Invention

[0004] Another objective of this invention is to provide a method for rotating cast-in-place beams across existing railways. This method monitors the rotation angle of the cast-in-place beams using a monitoring device. Compared to traditional rotation construction, it eliminates the need to measure and calculate the rotation angle using a total station and level during the rotation process, saving time and effort while ensuring the personal safety of construction personnel.

[0005] To achieve these objectives and other advantages according to the present invention, a method for rotating a cast-in-place beam across an existing railway is provided. A rotating system and a monitoring device are installed simultaneously on the pier. After the rotating system and the monitoring device are installed, a cast-in-place beam is constructed above the rotating system. The rotating system is then driven to rotate to rotate the cast-in-place beam to a preset angle. During the rotation process, the rotation angle of the cast-in-place beam is monitored by the monitoring device. The rotation construction of the cast-in-place beam is then completed.

[0006] The rotation system includes:

[0007] A lower ball joint is provided on the bearing platform, and an upper ball joint is provided above the lower ball joint. The upper ball joint is rotatably connected to the lower ball joint under the drive of the traction device, and the cast-in-place beam is located above the upper ball joint.

[0008] The monitoring device includes:

[0009] An annular rubber ring is fitted between the upper ball joint and the lower ball joint to seal the gap between the upper ball joint and the lower ball joint. The bottom of the annular rubber ring is fixedly connected to the outer side wall of the lower ball joint. The annular rubber ring has a mounting hole located above the lower ball joint.

[0010] A sleeve, one end of which is fixedly disposed on the outer side wall of the annular rubber ring and communicates with the mounting hole, and the other end of the sleeve extends out of the annular rubber ring. The extension direction of the sleeve is parallel to the tangent direction of the circumference of the upper ball joint.

[0011] The metal wire includes a first metal wire and a second metal wire connected in sequence. The first metal wire is fixedly disposed on the outer side wall of the upper ball joint along the circumference of the upper ball joint and located in the inner ring of the annular rubber ring. The end of the second metal wire away from the first metal wire passes through the mounting hole and is coiled in the sleeve before passing out of the outside of the sleeve. The second metal wire is fixedly connected to the inner side wall of the sleeve away from the upper ball joint. The length of the second metal wire coiled in the sleeve is the sum of the angular displacement of the rotating beam when it rotates to a preset angle and the length of the sleeve.

[0012] Wherein, the end of the first metal wire away from the second metal wire is electrically connected to the negative terminal of the power supply, the end of the second metal wire located outside the sleeve is electrically connected to one end of the resistor and the central processing unit, and the other end of the resistor is electrically connected to the positive terminal of the power supply.

[0013] An automatic control system is electrically connected to the central processing unit and the traction device.

[0014] Preferably, the rotating system further includes:

[0015] The lower ball joint frame is fixedly installed in the middle of the top surface of the pier. The lower ball joint is installed on the top surface of the lower ball joint frame. A positioning pin is vertically fixed at the center of the lower ball joint. Multiple polytetrafluoroethylene (PTFE) slides are arranged on the top surface of the lower ball joint. The upper ball joint is rotatably mounted on the multiple PTFE slides through the positioning pin.

[0016] The lower turntable is horizontally arranged and integrally formed with the support platform, the lower ball joint frame and the lower ball joint, and the top surface of the lower ball joint is higher than the top surface of the lower turntable;

[0017] The upper turntable is horizontally set and integrally formed with the upper ball joint. The bottom surface of the upper turntable is higher than the bottom surface of the upper ball joint. The cast-in-place beam is located above the upper turntable. The traction device is connected to the upper turntable. The monitoring device is located between the upper turntable and the lower turntable.

[0018] An annular slide is disposed on the outer periphery of the lower ball joint frame and integrally formed with the lower turntable. A steel plate is fixedly provided on the top surface of the annular slide, and the top surface of the steel plate is higher than the top surface of the lower turntable. Multiple slide plates are spaced apart along the circumference of the annular slide on the steel plate. A support foot is fixedly provided on any slide plate. The support foot is slidably disposed on the steel plate through the slide plate. The upper part of the support foot is integrally formed with the upper turntable.

[0019] Preferably, the traction device includes multiple traction cables, the anchoring ends of which are pre-embedded inside the upper turntable through multiple anchors, the free ends of which extend out of the upper turntable and are wound around the outer periphery of the upper turntable and then connected to multiple tension jacks. The multiple tension jacks are fixedly mounted on multiple traction reaction seats. Any tension jack is electrically connected to the automatic control system, and any traction reaction seat is fixedly mounted on the top of the pier.

[0020] Preferably, a limiting groove is fixedly provided on the inner sidewall of the sleeve near the upper ball joint, the second metal wire passes through the limiting groove, the inner diameter of the limiting groove is the same as the diameter of the second metal wire, and the inner bottom surface of the limiting groove is at the same horizontal height as the position where the second metal wire is fixed on the inner sidewall of the sleeve.

[0021] Preferably, the monitoring device further includes a bracket, which is fixedly mounted on the outer side wall of the lower ball joint, and the sleeve is fixedly connected to the bracket.

[0022] Preferably, the monitoring device further includes multiple hydraulic jacks, which are spaced apart circumferentially along the annular slide. The fixed end of any hydraulic jack is connected to the steel plate, and the telescopic end is vertically upward and abuts against the bottom surface of the upper turntable. The hydraulic jacks are electrically connected to the automatic control system.

[0023] Preferably, the center of the annular slide and the center of the lower ball joint are located at the same position.

[0024] Preferably, the construction of the cast-in-place beam rotation includes the following steps:

[0025] Step S1: After the foundation construction is completed, install the lower ball joint frame, lower ball joint, and annular slide on the foundation.

[0026] Step S2: Cast concrete for the lower turntable on the top surface of the foundation. The concrete for the lower turntable is integrally formed with the foundation, the lower ball joint frame, the lower ball joint and the annular slide.

[0027] Step S3: Install a positioning pin at the center of the lower ball joint, install a polytetrafluoroethylene sliding plate on the surface of the lower ball joint, and hoist the upper ball joint to connect with the lower ball joint.

[0028] Step S4: Install a monitoring device at the gap between the upper and lower ball joints;

[0029] Step S5: Erect formwork on the outer side of the top of the pier, pour concrete for the traction reaction seat, and install tension jacks; install steel plates, sliding plates, support feet, and hydraulic jacks on the annular slide.

[0030] Step S6: Pre-embed the traction cable, erect the formwork and pour the upper turntable concrete. The upper turntable concrete is integrally formed with the upper ball joint and the upper part of the support foot. After the traction cable is wrapped around the outer periphery of the upper turntable, it is connected to the tension jack on the traction reaction seat.

[0031] Step S7: Construct cast-in-place beams on the top surface of the upper turntable;

[0032] Step S8: The upper turntable is rotated by using tension jacks and traction cables to perform a trial rotation of the cast-in-place beam;

[0033] Step S9: The cast-in-place beam is rotated, and its rotation angle is monitored by a monitoring device. Once the cast-in-place beam has rotated to the preset angle, the hydraulic jack is driven to limit the upper turntable, and the rotation of the cast-in-place beam is completed.

[0034] The present invention has at least the following beneficial effects:

[0035] 1. This invention monitors the rotation angle of cast-in-place beams using a monitoring device. Compared with traditional rotation construction, it does not require measuring and calculating the rotation angle using a total station and level during the rotation process, saving time and effort, and ensuring the personal safety of construction personnel.

[0036] 2. In this invention, a hydraulic jack is installed between the steel plate and the upper turntable. The hydraulic jack is electrically connected to the automatic control system, which is electrically connected to the central processing unit. During the rotation process, after the automatic control system receives high-level data transmitted by the central processing unit, the automatic control system immediately shuts down the traction device and simultaneously drives the hydraulic jack to lift and abut against the upper turntable, restricting the rotation of the upper turntable and preventing the cast-in-place beam from continuing to move forward after it has been rotated to the correct position, thus ensuring the rotation accuracy.

[0037] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0038] Figure 1 This is a cross-sectional view of the rotating system of the present invention;

[0039] Figure 2 This is a top view of the rotating system of the present invention.

[0040] Figure 3 This is a schematic diagram of the monitoring device of the present invention;

[0041] Figure 4 This is a schematic diagram of the construction process of the present invention;

[0042] Explanation of reference numerals in the instruction manual:

[0043] 1. Foundation, 2. Lower turntable, 201. Lower ball joint, 202. Upper ball joint, 203. Annular slide, 204. Support leg, 205. Upper turntable, 206. Positioning pin, 3. Traction cable, 301. Tensioning jack, 302. Traction reaction seat, 4. Annular rubber ring, 401. First metal wire, 402. Second metal wire, 403. Sleeve, 404. Hydraulic jack, 405. Central processing unit, 406. Limiting groove, 5. Cast-in-place beam, 6. Sealing concrete. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0045] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] like Figure 1-4 As shown, this invention provides a method for rotating a cast-in-place beam across an existing railway, applied to the Xiaohanying Expressway (Fuyin Expressway to Wujing Expressway section), located in Sizhousi Village, Yunmeng County, Hubei Province. The Xiaohanying Expressway is constructed using a 25m simply supported small box girder (piers 29-30) + a (2×70)m concrete T-shaped box girder (pier 31) + a (5×25)m initially simply supported then continuous small box girder (piers 32-37), with a total length of 290m. Among them, the (2×70)m T-shaped box girder (cast-in-place beam) spans the Handan Expressway. The railway section's cast-in-place beams are rotated using the rotation construction process of this invention. The rotating weight is 26,000 tons, and the rotation is 79.5° counterclockwise. Before the rotation construction, a rotation system and a monitoring device are installed on the pier cap 1. After the rotation system and the monitoring device are installed, the cast-in-place beam 5 is constructed above the rotation system. Then, the rotation system is driven to rotate, thereby rotating the cast-in-place beam 5 to a preset angle. During the rotation process, the rotation angle of the cast-in-place beam 5 is monitored by the monitoring device. The rotation construction of the cast-in-place beam 5 is then completed.

[0047] The rotation system includes:

[0048] A lower ball joint 201 is provided on the bearing platform 1. An upper ball joint 202 is provided above the lower ball joint 201. The upper ball joint 202 is rotatably connected to the lower ball joint 201 under the drive of the traction device. The cast-in-place beam 5 is located above the upper ball joint 202.

[0049] The monitoring device includes:

[0050] An annular rubber ring 4 is sleeved between the upper ball joint 202 and the lower ball joint 201 to seal the gap between the upper ball joint 202 and the lower ball joint 201. The bottom of the annular rubber ring 4 is fixedly connected to the outer side wall of the lower ball joint 201. An installation hole is provided on the annular rubber ring 4, and the installation hole is located above the lower ball joint 201.

[0051] The sleeve 403 has one end fixedly disposed on the outer side wall of the annular rubber ring 4 and communicating with the mounting hole, and the other end of the sleeve 403 extends out of the annular rubber ring 4. The extension direction of the sleeve 403 is parallel to the tangential direction of the circumference of the upper ball joint 202.

[0052] The metal wire includes a first metal wire 401 and a second metal wire 402 connected in sequence. The first metal wire 401 is fixedly disposed on the outer side wall of the upper ball joint 202 along the circumference of the upper ball joint 202 and located in the inner ring of the annular rubber ring 4. The end of the second metal wire 402 away from the first metal wire 401 passes through the mounting hole and is coiled in the sleeve 403 before passing out of the outside of the sleeve 403. The second metal wire 402 is fixedly connected to the inner side wall of the sleeve 403 away from the upper ball joint 202. The length of the second metal wire 402 coiled in the sleeve 403 is the sum of the angular displacement of the rotating beam when it rotates to a preset angle and the length of the sleeve 403.

[0053] Wherein, the end of the first metal wire 401 away from the second metal wire 402 is electrically connected to the negative terminal of the power supply, the end of the second metal wire 402 located outside the sleeve 403 is electrically connected to one end of the resistor and the central processing unit 405, and the other end of the resistor is electrically connected to the positive terminal of the power supply.

[0054] An automatic control system is electrically connected to the central processing unit 405 and the traction device.

[0055] In the above technical solution, the lower ball joint 201 is mounted on the pier 1, and the upper ball joint 202 is mounted above the lower ball joint 201 and is rotatably connected to the lower ball joint 201 via a traction device. The traction device is controlled to start and stop by an automatic control system. The cast-in-place beam 5 is located above the upper ball joint 202, and driving the upper ball joint 202 to rotate will drive the cast-in-place beam 5 to rotate. The annular rubber ring 4 is fitted in the gap between the upper ball joint 202 and the lower ball joint 201. On the one hand, it prevents impurities from entering between the upper ball joint 202 and the lower ball joint 201 and hindering the rotation of the upper ball joint 202. On the other hand, it monitors the rotation angle of the cast-in-place beam 5 by setting a metal wire inside the annular rubber ring 4. Specifically, the first metal wire 4 01 is fixedly mounted on the outer wall of the upper ball joint 202. One end of the first metal wire 401 is connected to one end of the second metal wire 402. The other end of the second metal wire 402 passes through the mounting hole, is coiled inside the sleeve 403, and then extends out of the sleeve 403. The power supply is a storage battery, which can be fixed on the outer wall of the upper ball joint 202. The negative terminal of the storage battery is connected to the other end of the first metal wire 401 through a wire. The second metal wire 402 is located outside the sleeve 403 and is connected to one end of a resistor and the central processing unit 405 through two wires respectively. The other end of the resistor is connected to the positive terminal of the storage battery through a wire to form a complete circuit. The wires can be laid along the outer wall of the upper ball joint 202. During rotation, the workers drive the traction device through the automatic control system, causing the upper ball joint 202 to rotate, thereby causing the cast-in-place beam 5 to rotate. Since the first metal wire 401 is fixed to the outer wall of the upper ball joint 202, the rotation of the upper ball joint 202 will cause the first metal wire 401 to rotate. The first metal wire 401 and the second metal wire 402 are connected to each other. That is, while the first metal wire 401 rotates with the upper ball joint 202, it will gradually straighten the second metal wire 402 coiled in the sleeve 403. The length of the second metal wire 402 coiled in the sleeve 403 is the sum of the angular displacement of the cast-in-place beam 5 rotating to the preset angle and the length of the sleeve 403. The wire 402 is also fixed to the inner wall of the sleeve 403 away from the end of the lower ball joint 201. That is, when the upper ball joint 202 drives the cast-in-place beam 5 to rotate to the preset angle, the part of the second metal wire 402 located inside the sleeve 403 is in a completely straightened state. If the rotation angle is exceeded, the second metal wire 402 breaks instantly. When the second metal wire 402 breaks, the resistance increases instantly. The resistor is electrically connected to the positive terminal of the power supply. The end of the second metal wire 402 connected to the resistor will be pulled to a high level by the positive voltage of the resistor. After the central processing unit 405 detects the high level, it transmits it to the automatic control system. After receiving the high level, the automatic control system immediately shuts down the traction device, and the cast-in-place beam 5 stops rotating with a rotation angle of 79°.The angle is 5°, less than 180°. During the rotation, the wire will not be wound around the circumference of the upper ball joint 202, thus preventing damage to the wire and ensuring circuit continuity. This invention monitors the rotation angle of the cast-in-place beam 5 using a monitoring device. Compared to traditional rotation construction, it eliminates the need for measuring and calculating the rotation angle using a total station and level during the rotation process, saving time and effort and ensuring the safety of construction personnel. Since the sleeve 403 is parallel to the tangent direction of the upper ball joint 202, when the second metal wire 402 is straightened, it will also rotate around the circumference of the upper ball joint 202, ensuring precise control of the rotation angle.

[0056] In another technical solution, the rotating system further includes:

[0057] The lower ball joint frame is fixedly installed in the middle of the top surface of the support 1. The lower ball joint 201 is installed on the top surface of the lower ball joint frame. A positioning pin 206 is vertically fixed at the center of the lower ball joint 201. A plurality of polytetrafluoroethylene sliding plates are arranged on the top surface of the lower ball joint 201. The upper ball joint 202 is rotatably mounted on the plurality of polytetrafluoroethylene sliding plates through the positioning pin 206.

[0058] The lower turntable 2 is horizontally arranged and integrally formed with the support platform 1, the lower ball joint frame and the lower ball joint 201. The top surface of the lower ball joint 201 is higher than the top surface of the lower turntable 2.

[0059] The upper turntable 205 is horizontally set and integrally formed with the upper ball joint 202. The bottom surface of the upper turntable 205 is higher than the bottom surface of the upper ball joint 202. The cast-in-place beam 5 is located above the upper turntable 205. The traction device is connected to the upper turntable 205. The monitoring device is located between the upper turntable 205 and the lower turntable 2.

[0060] An annular slide 203 is disposed on the outer periphery of the lower ball joint frame and integrally formed with the lower turntable 2. A steel plate is fixedly provided on the top surface of the annular slide 203. The top surface of the steel plate is higher than the top surface of the lower turntable 2. Multiple slide plates are spaced apart along the circumference of the annular slide 203 on the steel plate. A support foot 204 is fixedly provided on any slide plate. The support foot 204 is slidably disposed on the steel plate through the slide plate. The upper part of the support foot 204 is integrally formed with the upper turntable 205.

[0061] In this technical solution, the lower ball joint 201 is fixedly installed on the bearing platform 1 via a lower ball joint frame. The lower ball joint frame provides support for the installation of the lower ball joint 201, improving the stability of the lower ball joint 201 during installation. To further improve the stability of the lower ball joint 201 during installation, a lower turntable 2 is integrally formed with the bearing platform 1, the lower ball joint frame, and the lower ball joint 201. The upper ball joint 202 and the lower ball joint 201 are rotatably connected by a positioning pin 206. A polytetrafluoroethylene sliding plate is used to improve the rotation effect of the upper ball joint 202. The rotation system mainly drives the cast-in-place beam 5 to rotate through the rotation of the upper ball joint 202. To improve the load-bearing capacity of the upper ball joint 202, an upper turntable 205 is provided... The upper ball joint 202 is integrally formed, and the cast-in-place beam 5 is set above the upper turntable 205. The annular slide 203 is set on the outer periphery of the lower ball joint frame and integrally formed with the lower turntable 2. The top surface of the annular slide 203 is provided with a sliding support foot 204. The upper part of the support foot 204 is integrally formed with the upper turntable 205. The support foot 204 and the annular slide 203 connect the upper turntable 205 and the lower turntable 2 together, which can improve the stability of the overall structure. When rotating, the middle part of the upper turntable 205 rotates through the positioning pin 206, and the outer periphery of the upper turntable 205 slides in the annular slide 203 through the support foot 204, ensuring the stability of the upper turntable 205 when rotating and improving construction safety.

[0062] In another technical solution, the traction device includes multiple traction cables 3, whose anchoring ends are pre-embedded in the interior of the upper turntable 205 through multiple anchors, and whose free ends extend out of the exterior of the upper turntable 205 and are wound around the outer periphery of the upper turntable 205 before being connected to multiple tension jacks 301. The multiple tension jacks 301 are respectively fixedly mounted on multiple traction reaction seats 302. Any tension jack 301 is electrically connected to the automatic control system, and any traction reaction seat 302 is fixedly mounted on the top of the pier 1.

[0063] In this technical solution, two traction cables 3 are pre-embedded. The anchoring ends of the two traction cables are symmetrically arranged along the center of the upper turntable 205. The anchorage and the anchoring ends of the traction cables are pre-embedded when the upper turntable 205 is poured. The exposed part of the traction cable 3 is smoothly wrapped around the upper turntable 205 and then connected to the corresponding tension jack 301. The tension jack 301 is fixed by the traction reaction seat 302. During the rotation, the tension jack is driven by the automatic control system to continuously tension, which drives the two traction cables 3 to tighten in the same direction, thereby realizing the rotation.

[0064] In another technical solution, a limiting groove 406 is fixedly provided on the inner sidewall of the sleeve 403 near the upper ball joint 202. The second metal wire 402 passes through the limiting groove 406. The inner diameter of the limiting groove 406 is the same as the diameter of the second metal wire 402, and the inner bottom surface of the limiting groove 406 is at the same horizontal height as the position where the second metal wire 402 is fixed on the inner sidewall of the sleeve 403.

[0065] In this technical solution, the limiting groove 406 is a U-shaped groove, with its two free ends fixedly set on the inner side wall of the sleeve 403. The second metal wire 402 passes through the limiting groove 406, and the limiting groove 406 plays a limiting and guiding role for the second metal wire 402, so that the second metal wire 402 can move smoothly out of the sleeve 403. The inner bottom surface of the limiting groove 406 is at the same height as the position where the second metal wire 402 is fixed in the sleeve 403, so that when the part of the second metal wire 402 in the sleeve 403 is in a fully taut state, it is still parallel to the length direction of the sleeve 403, so as to ensure that the length of the second metal wire 402 stretched out of the sleeve 403 is equal to the angular displacement of the cast-in-place beam 5, further ensuring the rotation accuracy.

[0066] In another technical solution, the monitoring device further includes a bracket, which is fixedly mounted on the outer wall of the lower ball joint 201, and the sleeve 403 is fixedly connected to the bracket.

[0067] In this technical solution, to prevent the upper part of the annular rubber ring 4 from twisting during the rotation of the upper ball joint 202, which would cause the sleeve 403 to move and affect the rotation accuracy, a bracket is set between the sleeve 403 and the lower ball joint 201 to fix the position of the sleeve 403. Both the bracket and the sleeve 403 are made of steel. One end of the bracket is welded to the outer wall of the sleeve 403 near the upper ball joint 202, and the other end is connected to the outer wall of the lower ball joint 201 by bolts. The resistor and the central processing unit 405 can also be fixed on the bracket to prevent them from vibrating during construction and affecting their service life.

[0068] In another technical solution, the monitoring device further includes multiple hydraulic jacks 404, which are spaced apart circumferentially along the annular slide 203. The fixed end of any hydraulic jack 404 is connected to the steel plate, and the telescopic end is vertically upward and abuts against the bottom surface of the upper turntable 205. The hydraulic jacks 404 are electrically connected to the automatic control system.

[0069] In this technical solution, the hydraulic jack 404 is positioned between the steel plate and the upper turntable 205. Firstly, it temporarily secures the rotation system before rotation. Specifically, after the upper turntable 205 is constructed, workers use the automatic control system to drive the hydraulic jack 404 to lift it, supporting the weight of the upper turntable 205 and the superstructure, thus ensuring the stability of the rotation system during the construction of the cast-in-place beam 5. After the cast-in-place beam 5 is completed, workers use the automatic control system to control the hydraulic jack 404 to reset. Secondly, during the rotation process, after the automatic control system receives high-level data transmitted from the central processor 405, it immediately shuts off the traction device while simultaneously driving the hydraulic jack 404 to lift and engage with the upper turntable 205, restricting the rotation of the upper turntable 205 and preventing the cast-in-place beam 5 from continuing to move forward after it has been rotated to its position, thus ensuring rotation accuracy.

[0070] In another technical solution, the center of the annular slide 203 and the center of the lower ball joint 201 are located at the same position.

[0071] In this technical solution, the center of the annular slide 203 and the center of the lower ball joint 201 are located at the same position, which can further ensure the stability of the upper turntable 205 when it rotates.

[0072] In another technical solution, the construction of the cast-in-place beam 5 by rotation specifically includes the following steps:

[0073] Step S1: After the construction of the foundation 1 is completed, install the lower ball joint frame, lower ball joint 201 and annular slide 203 on the foundation 1.

[0074] After the lower ball joint frame is hoisted onto the bearing platform 1, its position is adjusted to the center of the bearing platform 1. Then, the lower ball joint frame is welded and fixed to the pre-embedded steel plate on the bearing platform 1. The lower ball joint 201 is hoisted and connected to the lower ball joint frame, and its height and levelness are adjusted to the design standard using the adjusting bolts on the lower ball joint frame. After the lower ball joint 201 is installed, the annular slide 203 is installed. Depending on the site conditions, the annular slide 203 can be hoisted as a whole or hoisted in sections and then spliced. During hoisting, two perpendicular ropes can be used to determine the center of the annular slide 203, ensuring that the center of the annular slide 203 coincides with the rotation center of the ball joint. After hoisting, fine-tuning is performed, and then the annular slide 203 is fixed.

[0075] Step S2: Cast concrete for the lower turntable on the top surface of the foundation 1 using a formwork. The concrete for the lower turntable is integrally formed with the foundation 1, the lower ball joint frame, the lower ball joint 201, and the annular slide 203.

[0076] Step S3: Install a positioning pin 206 at the center of the lower ball joint 201, install a polytetrafluoroethylene sliding plate on the surface of the lower ball joint 201, and hoist the upper ball joint 202 to connect with the lower ball joint 201.

[0077] Place the positioning pin 206 at the center of the lower ball joint 201, adjust the perpendicularity and peripheral clearance, and then install the PTFE sliding plates of the lower ball joint 201 and the upper ball joint 202. Before installing the PTFE sliding plates, clean the top surface of the lower ball joint 201 thoroughly. Ensure there are no foreign objects on the ball joint surface or inside the holes where the PTFE sliding plates will be installed, and dry the spherical surface. Place the PTFE sliding plates into their corresponding mounting holes from the inside out according to their numbers. After installation, ensure their top surfaces are on the same spherical surface. After inspection and approval, apply PTFE powder or grease between the PTFE sliding plates on the spherical surface. Make sure the PTFE butter powder evenly fills the space between the PTFE sliding plates and is slightly higher than the PTFE sliding plates, ensuring that there is a layer of PTFE butter powder on the top surface. The entire installation process should keep the spherical surface clean and strictly prohibit bringing debris onto the spherical surface. Lift the upper ball joint 202, apply a layer of PTFE powder to the convex spherical surface of the upper ball joint 202, then align the upper ball joint 202 with the positioning pin 206 and gently lower it onto the lower ball joint 201. Use a chain hoist to finely adjust the position of the upper ball joint 202 so that it is horizontal and consistent with the outer ring gap of the lower ball joint 201. Test rotate the upper ball joint 202 to ensure that it can rotate and remove the excess butter that has been squeezed out.

[0078] Step S4: Install a monitoring device in the gap between the upper ball joint 202 and the lower ball joint 201;

[0079] Install monitoring devices at the gaps between the upper and lower ball joint edges to prevent debris from entering the ball joint friction part, and at the same time prepare for the monitoring of the rotation angle of the subsequent cast-in-place beam 5.

[0080] Step S5: Cast concrete for the traction reaction seat 302 on the outer side of the top of the foundation 1 and install the tension jack 301; install steel plate, sliding plate, support foot 204 and hydraulic jack 404 on the annular slide 203.

[0081] The traction reaction seat 302 adopts a reinforced concrete structure; the installation of steel plates and sliding plates requires that multiple sliding plates be located on the same horizontal plane; the support legs 204 are manufactured as a whole in the factory and transported to the site for installation; and one hydraulic jack 404 is set between each of two adjacent support legs 204.

[0082] Step S6: Pre-embed traction cable 3, erect formwork and pour concrete for the upper turntable. The upper turntable concrete is integrally formed with the upper ball joint 202 and the upper part of the support leg 204. After the traction cable 3 is wrapped around the outer periphery of the upper turntable 205, it is connected to the tension jack 301 on the traction reaction seat 302.

[0083] The fixed end of the pre-embedded traction cable 3 is fixed with a 19-hole anchor (P anchor). The anchoring ends of a pair of traction cables 3 should be on the same diameter line and symmetrical about the center of the upper turntable 205. The pre-embedded height of each traction cable 3 should be consistent with the traction direction. The exit point of each traction cable 3 should also be symmetrical about the center of the upper turntable 205. When pouring the upper turntable 205, the traction cable support steel bars should be pre-embedded and a semi-circular groove should be reserved at the traction center. The exposed part of the traction cable 3 should be smoothly wrapped around the upper turntable and then connected to the tensioning jack 301.

[0084] Step S7: Construct cast-in-place beam 5 on the top surface of the upper turntable 205;

[0085] Before constructing the cast-in-place beam 5, the hydraulic jack 404 is driven by the automatic control system to lift and contact the upper turntable 205 to ensure the stability of the rotation system when constructing the cast-in-place beam 5.

[0086] Step S8: The upper turntable 205 is rotated by the tension jack 301 and the traction cable 3 to perform a test rotation of the cast-in-place beam 5;

[0087] The hydraulic jack 404 is reset by the automatic control system, and then the tensioning jack 301 is driven to continuously tension and wind up the traction cable 3, which drives the upper turntable 205 to rotate for a test rotation. Various data during the rotation process are recorded to determine whether the rotation requirements are met.

[0088] Step S9: The cast-in-place beam 5 is rotated and its rotation angle is monitored by the monitoring device. When the cast-in-place beam 5 is rotated to the preset angle, the hydraulic jack 404 is driven to limit the upper turntable 205, and the rotation of the cast-in-place beam 5 is completed.

[0089] The automatic control system drives the traction device to rotate the cast-in-place beam 5. After the automatic control system receives the high-level data transmitted by the central processor 405, it shuts down the traction device and drives the hydraulic jack 404 to lift and limit the upper turntable 205. After the rotation is in place, the sealing concrete 6 is poured to seal the hinge, connecting the upper turntable 205 and the lower turntable 2 into one unit. To avoid wasting resources, the hydraulic jack 404 can be connected to the steel plate with bolts. After the rotation is completed, the workers place a limit frame between the upper turntable 205 and the steel plate to replace the hydraulic jack 404. Then the hydraulic jack 404 is removed. Other components of the monitoring device can also be removed according to the on-site construction conditions.

[0090] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for rotating a cast-in-place beam across an existing railway, characterized in that, Simultaneously, a monitoring device is installed on the pier to rotate the beam. After the rotation system and monitoring device are installed, a cast-in-place beam is constructed above the rotation system. Then, the rotation system is driven to rotate to rotate the cast-in-place beam to a preset angle. During the rotation process, the rotation angle of the cast-in-place beam is monitored by the monitoring device. The rotation construction of the cast-in-place beam is then completed. The rotation system includes: A lower ball joint is provided on the bearing platform, and an upper ball joint is provided above the lower ball joint. The upper ball joint is rotatably connected to the lower ball joint under the drive of the traction device, and the cast-in-place beam is located above the upper ball joint. The monitoring device includes: An annular rubber ring is fitted between the upper ball joint and the lower ball joint to seal the gap between the upper ball joint and the lower ball joint. The bottom of the annular rubber ring is fixedly connected to the outer side wall of the lower ball joint. The annular rubber ring has a mounting hole located above the lower ball joint. A sleeve, one end of which is fixedly disposed on the outer side wall of the annular rubber ring and communicates with the mounting hole, and the other end of the sleeve extends out of the annular rubber ring. The extension direction of the sleeve is parallel to the tangent direction of the circumference of the upper ball joint. The metal wire includes a first metal wire and a second metal wire connected in sequence. The first metal wire is fixedly disposed on the outer side wall of the upper ball joint along the circumference of the upper ball joint and located in the inner ring of the annular rubber ring. The end of the second metal wire away from the first metal wire passes through the mounting hole and is coiled in the sleeve before passing out of the outside of the sleeve. The second metal wire is fixedly connected to the inner side wall of the sleeve away from the upper ball joint. The length of the second metal wire coiled in the sleeve is the sum of the angular displacement of the rotating beam when it rotates to a preset angle and the length of the sleeve. Wherein, the end of the first metal wire away from the second metal wire is electrically connected to the negative terminal of the power supply, the end of the second metal wire located outside the sleeve is electrically connected to one end of the resistor and the central processing unit, and the other end of the resistor is electrically connected to the positive terminal of the power supply. An automatic control system is electrically connected to the central processing unit and the traction device.

2. The method for rotating a cast-in-place beam across an existing railway as described in claim 1, characterized in that, The rotation system also includes: The lower ball joint frame is fixedly installed in the middle of the top surface of the pier. The lower ball joint is installed on the top surface of the lower ball joint frame. A positioning pin is vertically fixed at the center of the lower ball joint. Multiple polytetrafluoroethylene (PTFE) slides are arranged on the top surface of the lower ball joint. The upper ball joint is rotatably mounted on the multiple PTFE slides through the positioning pin. The lower turntable is horizontally arranged and integrally formed with the support platform, the lower ball joint frame and the lower ball joint, and the top surface of the lower ball joint is higher than the top surface of the lower turntable; The upper turntable is horizontally set and integrally formed with the upper ball joint. The bottom surface of the upper turntable is higher than the bottom surface of the upper ball joint. The cast-in-place beam is located above the upper turntable. The traction device is connected to the upper turntable. The monitoring device is located between the upper turntable and the lower turntable. An annular slide is disposed on the outer periphery of the lower ball joint frame and integrally formed with the lower turntable. A steel plate is fixedly provided on the top surface of the annular slide, and the top surface of the steel plate is higher than the top surface of the lower turntable. Multiple slide plates are spaced apart along the circumference of the annular slide on the steel plate. A support foot is fixedly provided on any slide plate. The support foot is slidably disposed on the steel plate through the slide plate. The upper part of the support foot is integrally formed with the upper turntable.

3. The method for rotating a cast-in-place beam across an existing railway as described in claim 2, characterized in that, The traction device includes multiple traction cables, whose anchoring ends are pre-embedded inside the upper turntable through multiple anchors. The free ends extend out of the upper turntable and are wound around the outer periphery of the upper turntable before being connected to multiple tension jacks. The multiple tension jacks are fixedly mounted on multiple traction reaction seats. Any tension jack is electrically connected to the automatic control system, and any traction reaction seat is fixedly mounted on the top of the pier.

4. The method for rotating a cast-in-place beam across an existing railway as described in claim 1, characterized in that, A limiting groove is fixedly provided on the inner side wall of the sleeve near the upper ball joint. The second metal wire passes through the limiting groove. The inner diameter of the limiting groove is the same as the diameter of the second metal wire, and the inner bottom surface of the limiting groove is at the same horizontal height as the position where the second metal wire is fixed on the inner side wall of the sleeve.

5. The method for rotating a cast-in-place beam across an existing railway as described in claim 1, characterized in that, The monitoring device also includes a bracket, which is fixedly mounted on the outer side wall of the lower ball joint, and the sleeve is fixedly connected to the bracket.

6. The method for rotating a cast-in-place beam across an existing railway as described in claim 2, characterized in that, The monitoring device also includes multiple hydraulic jacks, which are spaced apart circumferentially along the annular slide. The fixed end of any hydraulic jack is connected to the steel plate, and the telescopic end is vertically upward and abuts against the bottom surface of the upper turntable. The hydraulic jacks are electrically connected to the automatic control system.

7. The method for rotating a cast-in-place beam across an existing railway as described in claim 2, characterized in that, The center of the annular slide and the center of the lower ball joint are located at the same position.

8. The method for rotating a cast-in-place beam across an existing railway as described in any one of claims 1-7, characterized in that, The specific steps involved in the construction of a cast-in-place beam rotation are as follows: Step S1: After the foundation construction is completed, install the lower ball joint frame, lower ball joint, and annular slide on the foundation. Step S2: Cast concrete for the lower turntable on the top surface of the foundation. The concrete for the lower turntable is integrally formed with the foundation, the lower ball joint frame, the lower ball joint and the annular slide. Step S3: Install a positioning pin at the center of the lower ball joint, install a polytetrafluoroethylene sliding plate on the surface of the lower ball joint, and hoist the upper ball joint to connect with the lower ball joint. Step S4: Install a monitoring device at the gap between the upper and lower ball joints; Step S5: Erect formwork on the outer side of the top of the pier, pour concrete for the traction reaction seat, and install tension jacks; install steel plates, sliding plates, support feet, and hydraulic jacks on the annular slide. Step S6: Pre-embed the traction cable, erect the formwork and pour the upper turntable concrete. The upper turntable concrete is integrally formed with the upper ball joint and the upper part of the support foot. After the traction cable is wrapped around the outer periphery of the upper turntable, it is connected to the tension jack on the traction reaction seat. Step S7: Construct cast-in-place beams on the top surface of the upper turntable; Step S8: The upper turntable is rotated by using tension jacks and traction cables to perform a trial rotation of the cast-in-place beam; Step S9: The cast-in-place beam is rotated, and its rotation angle is monitored by a monitoring device. Once the cast-in-place beam has rotated to the preset angle, the hydraulic jack is driven to limit the upper turntable, and the rotation of the cast-in-place beam is completed.

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