A swivel auxiliary device and a bridge synchronous swivel construction method
By using mechanical guiding devices and automatic locking mechanisms, the problems of electronic equipment failure and manual operation lag during bridge rotation construction have been solved, achieving precise control and improved safety of bridge rotation.
Patent Information
- Application Number
- CN202610775610.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-01
- Publication Date
- 2026-08-25
AI Technical Summary
In existing bridge rotation construction technologies, the high risk of electronic equipment failure, the lag in manual operation response, and the insufficient reliability of mechanical limit methods lead to inaccurate rotation control and potential safety hazards.
A mechanical guiding device is adopted, which realizes the mechanical guidance and automatic locking of the bridge rotation through the guide plate scale and the automatic locking mechanism of the sliding seat, eliminating the dependence on electronic equipment and ensuring the stability and safety of the rotation process.
Even when the electronic monitoring system fails or in harsh environments, the bridge rotation can still be precisely controlled to avoid over-rotation risks and improve the safety, convenience and reliability of construction.
Smart Images
Figure CN122629795A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of bridge rotation construction technology, and more specifically, to a rotation auxiliary device and a method for synchronous bridge rotation construction. Background Technology
[0002] Bridge rotation construction, due to its advantages such as not interrupting existing railway traffic and controllable construction safety risks, has been widely used in bridge construction projects spanning railways, highways, and canyons. Traditional rotation construction typically employs a traction system of ball joints and continuous jacks. By setting ball joints at the bottom of the piers, the superstructure is rotated horizontally, and the rotation angle is measured in real time using electronic monitoring equipment such as total stations and Beidou navigation systems. Operators control the start and stop of the jacks to ultimately position the bridge beam.
[0003] However, existing technologies have the following shortcomings in controlling rotation positioning: First, it relies on electronic equipment, which poses a risk of failure: Angle measurement and positioning judgment mainly rely on electronic instruments such as total stations, Beidou, and angle sensors. Once there is a power outage, signal interruption, or sensor drift, the operator will not be able to accurately obtain the real-time rotation angle, which may easily lead to the rotation exceeding the limit.
[0004] Secondly, there is a lag in manual operation response: even if the electronic monitoring is normal, the operator still needs to manually stop the jack based on the instrument reading. There is a time delay from the detection of the target angle to the execution of the stop, and the reaction speed of different operators varies, making it difficult to guarantee that the jack can be stopped accurately every time.
[0005] Third, the mechanical limiting method is simple and unreliable: some projects set blocks or locking holes on the outer edge of the turntable, but the blocks are rigid collisions, which are easily damaged by large impacts; the locking holes need to be precisely positioned and drilled on the turntable in advance according to the design angle. Once there is a deviation in the hole diameter or a slight over-rotation of the rotating body, the locking pin is difficult to insert accurately, resulting in locking failure. Summary of the Invention
[0006] This invention provides a rotation auxiliary device and a bridge synchronous rotation construction method, which can overcome some or all the defects of the prior art.
[0007] According to a rotating auxiliary device of the present invention, the device body includes a base, the base including two columns for connecting to the ground; two parallel and arc-shaped first guide plates and second guide plates are provided between the two columns; the first guide plates, the second guide plates and the two columns together constitute a guiding section; a first sliding seat for connecting to the ground and sliding along the guiding section is provided below the guiding section; a second sliding seat for connecting to the pier and sliding along the guiding section is provided above the guiding section; a locking mechanism is provided at the second sliding seat, the locking mechanism being used to connect the first sliding seat and the second sliding seat when the second sliding seat passes over the first sliding seat.
[0008] Preferably, the first sliding seat includes a first base plate and a first upright rod arranged perpendicular to the first base plate; the end of the first upright rod away from the first base plate is provided with a first circular plate extending into the guide interval, and the upper surface of the first circular plate extends downward to form a first limiting groove arranged along the length direction of the first upright rod; The second sliding seat includes a second base plate and a second upright rod perpendicular to the second base plate; the end of the second upright rod away from the second base plate is provided with a second circular plate extending into the guide section; the upper surface of the second circular plate extends downward to form a second limiting groove along the length direction of the second upright rod; the locking mechanism includes a locking pin disposed in the second limiting groove; the second circular plate is provided with a baffle for blocking the locking pin and a limiting hole for the baffle to pass through; one end of the baffle is provided with a first limiting plate, and both sides of the baffle are provided with limiting rods connected to the side wall of the second circular plate and passing through the first limiting plate; a tension spring is sleeved on the limiting rod, and the two ends of the tension spring are respectively connected to the first limiting plate and the second circular plate; the side wall of the first circular plate is provided with a fixing plate for pushing the baffle to move; the baffle is provided with a through hole for the locking pin to pass through.
[0009] Preferably, a second limiting plate is provided at the end of the limiting rod that passes through the first limiting plate.
[0010] Preferably, the second limiting groove is provided with a first spring for pushing the locking pin out of the second limiting groove; the side wall of the second upright is provided with a strip-shaped through hole along the length of the second upright, the side wall of the locking pin is provided with a connecting block passing through the strip-shaped through hole, and the end of the connecting block away from the locking pin is provided with a third limiting plate.
[0011] Preferably, both the upper surfaces of the first guide plate and the second guide plate are provided with scale markings.
[0012] Preferably, the first upright has multiple first reinforcing plates distributed circumferentially along the side wall of the first upright, and multiple first bolt holes are provided at the first base plate; the second upright has multiple second reinforcing plates distributed circumferentially along the side wall of the second upright, and multiple second bolt holes are provided at the second base plate.
[0013] Preferably, a buffer assembly for cooperating with the second reinforcing plate is provided above the guide section. The buffer assembly includes a mounting block, an internal mounting cavity, and two mounting holes communicating with the mounting cavity on the side wall of the mounting block. The mounting cavity contains two first buffer blocks and a second buffer block passing through the mounting holes. The mounting cavity also contains a connecting plate for connecting the first buffer blocks and the second buffer blocks. A second spring for pressing the connecting plate is provided at the bottom of the connecting plate. A cover plate connected to the mounting block and used to seal the opening of the mounting cavity is provided above the mounting block. On the outer side walls of the first guide plate and the second guide plate, there are first reinforcing blocks and second reinforcing blocks respectively arranged at intervals along their length direction; adjacent first reinforcing blocks and the first guide plate together form a first limiting interval; adjacent second reinforcing blocks and the second guide plate together form a second limiting interval; at the end face of the mounting block away from the cover plate, there are multiple first connecting feet and second connecting feet that extend into the first limiting interval and the second limiting interval respectively.
[0014] Preferably, the inner sidewalls of the first guide plate and the second guide plate are respectively provided with two first guide grooves and two guide grooves arranged along their length direction, into which the first circular plate and the second circular plate extend.
[0015] This invention provides a method for synchronous rotation construction of bridges, including the aforementioned rotation auxiliary device, and the steps are as follows. S1. Construction of the Rotation Support System The main rotating pier and its lower turntable, upper turntable, and rotating support system are constructed on both sides of the existing railway. The rotating support system includes ball joints and traction steel strands. Specifically, the pile foundation and pile cap are constructed first. The lower turntable is poured on the pile cap and the lower ball joint is installed, ensuring that the center of the ball joint coincides with the design rotation center and the height difference between the top surfaces is no more than 1 mm. After embedding polytetrafluoroethylene sliding plates on the lower ball joint and applying grease, the upper ball joint and the center positioning pin are hoisted to make the upper and lower ball joints fit together. Then, the upper turntable reinforcement is tied, the traction steel strands are symmetrically embedded and their anchor ends are fixed, and the upper turntable concrete is poured. Finally, the support feet are installed at the bottom of the upper turntable, leaving a 20 mm gap with the slide rail on the top surface of the lower turntable, thus completing the construction of the rotating support system. S2, Cast-in-place beam segment After the concrete of the upper turntable reaches the design strength, the main pier for rotation is constructed on the top surface of the upper turntable. The vertical steel bars of the main pier are connected to the reserved steel bars of the upper turntable. After the formwork is erected, the concrete of the main pier is poured as a whole, so that the bottom of the main pier is fixed to the upper turntable. On the rotating main pier, T-shaped beam segments are symmetrically poured using a hanging basket cantilever to form the beam segments to be rotated. Specifically, the hanging basket is assembled on the block at the top of the main pier. Then, with the block at the top of the main pier as the center, the beam segments are poured symmetrically to both sides in sequence. After each segment is poured, the prestressed steel strands of that segment are tensioned to keep the beam in a cantilever state and maintain stress balance until all the designed segments are poured, forming a complete T-shaped beam segment to be rotated. S3, Weighing and Balancing Test After the beam is poured, a weighing and balancing test is conducted to determine the unbalanced moment. Based on the test results, counterweights are added to the beam. Specifically, jacks and displacement sensors are symmetrically arranged below the upper turntable of the main rotating pier. The jacking force is applied in stages to measure the critical force when the rotating structure changes from a static friction state to a dynamic friction state. The actual unbalanced moment and eccentricity are calculated. Based on the calculation results, counterweights are added to the lighter end of the beam to control the center of gravity offset within the range of 5cm to 15cm. S4, Bridge Rotation First, the base is fixed to the ground by the column, so that the arc center of the guide section coincides with the rotation center of the pier. Then, the arc length position of the first sliding seat in the guide section is calculated according to the design rotation angle, and the first sliding seat is fixedly installed at the arc length position on the ground. Then, the second sliding seat is fixedly connected to the bottom of the pier. Then, a hydraulic synchronous automatic continuous traction system is used to drive the left and right rotating beams to rotate synchronously counterclockwise during the railway closure window. During the rotation, the second sliding seat slides along the guide section with the pier. When the second sliding seat slides directly above the first sliding seat, the second sliding seat and the first sliding seat are aligned vertically, and the locking mechanism is automatically triggered to lock the first sliding seat and the second sliding seat, thereby preventing the pier from continuing to rotate through the fixed anchoring effect of the first sliding seat. S5, Remove auxiliary devices After the rotation is in place, confirm that the locking mechanism has been effectively locked, seal the upper and lower turntables, complete the system conversion, and remove the rotation auxiliary device.
[0016] Through this invention, the combination of the device and method allows the rotation to be completed using the guide plate scale even when the electronic monitoring system fails, and automatically locks in place to prevent over-rotation. The second sliding seat slides with the pier column to the preset position of the first sliding seat, triggering the lock without manual judgment or operation, thus eliminating human error and reaction delay; thereby significantly improving the safety, convenience, and reliability of construction. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the main body of the device in Example 1.
[0019] Figure 2 This is a schematic diagram of the base in Example 1.
[0020] Figure 3 This is a cross-sectional view of the base in Example 1.
[0021] Figure 4 This is a schematic diagram of the sliding seat assembly in Example 1.
[0022] Figure 5 This is a schematic diagram of the second sliding seat in Example 1.
[0023] Figure 6 This is a schematic diagram of the first sliding seat in Example 1.
[0024] Figure 7 This is a cross-sectional view of the sliding seat assembly in Example 1.
[0025] Figure 8 This is a cross-sectional view of the locking mechanism in Example 1.
[0026] Figure 9 This is a schematic diagram of the buffer component in Example 1.
[0027] Figure 10 This is an exploded view of the buffer component in Example 1. Detailed Implementation
[0028] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.
[0029] Example 1 like Figure 1-10 As shown, this embodiment provides a rotation assist device, which includes a device body 100, a base 110, and two columns 220 for connecting to the ground. Two parallel, arc-shaped first guide plate 230 and second guide plate 270 are provided between the two columns 220. The first guide plate 230, second guide plate 270, and two columns 220 together form a guide section 260. A first sliding seat 420 for connecting to the ground and sliding along the guide section 260 is provided below the guide section 260. A second sliding seat 410 for connecting to a pier and sliding along the guide section 260 is provided above the guide section 260. A locking mechanism is provided at the second sliding seat 410, which connects the first sliding seat 420 and the second sliding seat 410 when the second sliding seat 410 passes above the first sliding seat 420.
[0030] In this embodiment, during the bridge rotation construction, the construction personnel first drive pile foundations on both sides of the existing railway, and then pour a bearing platform on top of the pile foundations. On the bearing platform, the lower turntable is poured and the lower ball joint is precisely installed to ensure that the center of the ball joint coincides with the design rotation center and the height difference between the top surfaces is no more than 1mm. After embedding polytetrafluoroethylene sliding plates on the lower ball joint and applying grease, the upper ball joint and the center positioning pin are hoisted to ensure that the upper and lower ball joints fit tightly together. Then, the upper turntable reinforcement is tied, the traction steel strands are symmetrically pre-embedded and their anchoring ends are fixed, and the upper turntable concrete is poured. Finally, the support feet are installed at the bottom of the upper turntable. After the concrete of the upper turntable reaches the design strength, the main pier for rotation is constructed on the top surface of the upper turntable. The vertical steel bars of the main pier are connected to the reserved steel bars of the upper turntable. After the formwork is erected, the concrete of the main pier is poured as a whole, so that the bottom of the main pier is fixed to the upper turntable. On the rotating main pier, T-shaped beam segments are symmetrically poured using a hanging basket cantilever to form the beam segments to be rotated. Specifically, the hanging basket is assembled on the block at the top of the main pier. Then, with the block at the top of the main pier as the center, the beam segments are poured symmetrically to both sides in sequence. After each segment is poured, the prestressed steel strands of that segment are tensioned to keep the beam in a cantilever state and maintain stress balance until all the designed segments are poured, forming a complete T-shaped beam segment to be rotated. After the cantilever beam is poured, a weighing and balancing test is conducted to determine the unbalanced moment. Based on the test results, counterweights are then added to the beam. The specific steps are as follows: Four jacks are symmetrically arranged along the longitudinal and transverse directions of the spherical hinge between the upper turntable and the top surface of the lower turntable of the rotating main pier, two on each side. Each jack is equipped with a precision pressure sensor with a range of 0–500 kN and an accuracy of ±0.5%FS. Four large-range displacement sensors with a range of ±10 mm and an accuracy of 0.01 mm are installed on the bottom surface of the upper turntable at corresponding positions to the jacks. The magnetic base of the displacement sensors is fixed to the top surface of the lower turntable, and the probe rests against the bottom surface of the upper turntable. All temporary loads on the rotating structure are removed, including any stacked loads. Materials and equipment are limited to the structural self-weight. A total station and prism are placed at each cantilever end of the beam to monitor the vertical displacement of the beam ends during the jacking process. The initial readings of each displacement sensor are recorded, and the elevation difference between the two ends of the beam and the plane position of the cantilever end are measured as the reference data for subsequent calculations. The jacks are jacked synchronously in stages, with a load of 10kN per stage and a holding time of 2 minutes per stage. The changes in the readings of each displacement sensor under each load stage are recorded. When the displacement sensor readings suddenly change, i.e., when the rotating structure begins to detach from the ball joint, the critical jacking forces F1 and F2 on both sides of the longitudinal bridge direction, and F3 and F4 on both sides of the transverse bridge direction are recorded. The test is repeated 2 to 3 times, and the average value is taken as the final critical force. Based on the measured critical force and the jack arrangement radius, calculate the unbalanced moment Mu of the rotating structure = (F1 - F2) × R / 2, where R is the distance from the jack center to the rotating center. Simultaneously calculate the eccentricity e0 = Mu / G, where G is the total weight of the rotating structure. If the eccentricity e0 exceeds 5cm, counterweights are required. Also, based on the above method and the difference in critical force along the transverse bridge direction, determine if there is a lateral imbalance; if so, counterweights are also needed for adjustment. Based on the calculated unbalanced moment and eccentricity, determine the counterweight mass W = Mu / L, where L is the distance from the counterweight point to the rotation center. The counterweight point should preferably be selected at the end of the cantilever end of the beam or at the segment division line. Place the counterweight material at the corresponding position on the upturned side of the beam, using standard weight sandbags, water tanks, or precast concrete blocks. Apply the counterweight symmetrically in stages. After each stage of counterweight is applied, remeasure the beam end height difference and the reading of the upper turntable displacement sensor to observe whether the rotating structure tends to be balanced. Repeat the adjustment until the eccentricity in both the longitudinal and transverse directions is controlled within the range of 5cm to 15cm. After the counterweight is completed, securely fix all counterweight materials to the beam to prevent slippage or falling during the rotation.
[0031] Before the bridge rotation, the construction workers installed rotation auxiliary devices on both sides of the pier. First, bolt holes were pre-drilled on the cast-in-place ground platform. Then, bolts were inserted through holes in the base plate 210 at the lower end of the column 220 and fixed to the ground platform, so that the arc center of the guide section 260 coincided with the rotation center of the pier. Then, the arc length position of the first sliding seat 420 required to be fixed in the guide section 260 was calculated according to the design rotation angle. Then, the first sliding seat 420 was pushed to move along the guide section 260 to the arc length position. Then, bolts were inserted through the first bolt holes 640 on the first base plate 650 at the bottom of the first sliding seat 420 and fixed to the ground platform. The second sliding seat 410 is then fixed to the bottom of the pier by bolts passing through the second bolt holes 510 on the second base plate 520. A hydraulic synchronous automatic continuous traction system is then used to drive the left and right rotating beams to rotate synchronously counterclockwise during the railway closure window. During rotation, the second sliding seat 410 slides along the guide section 260 with the pier. When the second sliding seat 410 is about to move directly above the first sliding seat 420, the baffle 570 at the lower end of the second sliding seat 410 will press against the fixed section at the upper end of the first sliding seat 420. When the fixed plate 660 is in place, the baffle 570 will be pushed and the tension spring 502 will be stretched. When the second sliding seat 410 slides to the top of the first sliding seat 420, the second sliding seat 410 and the first sliding seat 420 are aligned vertically to form a sliding seat group 130. At this time, the through hole 820 on the baffle 570 connects the second limiting groove 710 and the first limiting groove 730. The locking pin 580 in the second limiting groove 710 will be pushed by the first spring 720, pass through the through hole 820 and extend into the first limiting groove 730, thereby preventing the pier from continuing to rotate. Compared with existing technologies, this device adopts mechanical guidance, sliding alignment and spring-triggered locking, requiring no power or network support, and can still work normally in harsh weather, vibration and power-free environments; it does not rely on electronic equipment such as total stations, Beidou, and sensors, avoiding the risk of failure such as power outages, signal interruptions, and equipment drift; the fixed position of the first sliding seat 420 is precisely installed according to the preset angle; after the second sliding seat 410 slides into place along the arc-shaped guide rail with the pier, the locking mechanism is automatically triggered, physically locking the first sliding seat 420 and the second sliding seat 410, structurally forcibly preventing the pier from continuing to rotate, without manual intervention, thus avoiding the reaction delay caused by manually stopping the jack based on instrument readings, which could lead to the pier over-rotation; the arc-shaped track formed by the first guide plate 230 and the second guide plate 270 forms a forced constraint on the first sliding seat 420 and the second sliding seat 410, ensuring that the pier can rotate strictly along the designed arc trajectory, effectively suppressing lateral sway and improving the stability of the rotation process.
[0032] In this embodiment, the first sliding seat 420 includes a first base plate 650 and a first upright 630 arranged perpendicular to the first base plate 650; the end of the first upright 630 away from the first base plate 650 is provided with a first circular plate 610 extending into the guide interval 260, and the upper end of the first circular plate 610 extends downward to form a first limiting groove 730 arranged along the length direction of the first upright 630. The second sliding seat 410 includes a second base plate 520 and a second upright 503 perpendicular to the second base plate 520; one end of the second upright 503 away from the second base plate 520 is provided with a second circular plate 560 extending into the guide section 260; the upper end of the second circular plate 560 extends downward to form a second limiting groove 710 along the length direction of the second upright 503; the locking mechanism includes a locking pin 580 disposed in the second limiting groove 710; a baffle 570 for blocking the locking pin 580 is provided at the second circular plate 560, and A limiting hole 830 is provided for the baffle 570 to pass through; a first limiting plate 590 is provided at one end of the baffle 570, and limiting rods 501 are provided on both sides of the baffle 570 to connect with the side wall of the second circular plate 560 and pass through the first limiting plate 590; a tension spring 502 is sleeved on the limiting rod 501, and the two ends of the tension spring 502 are respectively connected to the first limiting plate 590 and the second circular plate 560; a fixing plate 660 for pushing the baffle 570 to move is provided on the side wall of the first circular plate 610; a through hole 820 is provided at the baffle 570 for the locking pin 580 to pass through.
[0033] In this embodiment, when the device is not in use, the tension spring 502 will pull the first limiting plate 590, causing the through hole 820 on the baffle 570 to be misaligned with the opening of the second limiting groove 710, so that the baffle 570 blocks the opening of the second limiting groove 710, preventing the locking pin 580 from extending out of the second limiting groove 710 and affecting the normal rotation of the second sliding seat 410.
[0034] In this embodiment, a second limiting plate 840 is provided at one end of the limiting rod 501 that passes through the first limiting plate 590.
[0035] In this embodiment, the second limiting plate 840 is used to prevent the limiting rod 501 from separating from the first limiting plate 590.
[0036] In this embodiment, the second limiting groove 710 is provided with a first spring 720 for pushing the locking post 580 out of the second limiting groove 710; the side wall of the second upright 503 is provided with a strip-shaped through hole 540 arranged along the length direction of the second upright 503, the side wall of the locking post 580 is provided with a connecting block passing through the strip-shaped through hole 540, and the end of the connecting block away from the locking post 580 is provided with a third limiting plate 550.
[0037] In this embodiment, after the bridge rotation is completed, the construction workers will dismantle the device. First, the connecting bolts between the first sliding seat 420 and the second sliding seat 410 and the pier and abutment need to be released. Then, the locking state between the first sliding seat 420 and the second sliding seat 410 is released. The construction workers push the third limiting plate 550 upward. The third limiting plate 550 moves axially along the second upright 503. At this time, the locking post 580 will be lifted, disengaged from the first limiting groove 730 and the through hole 820, and retracted into the second limiting groove 710. Then, the first sliding seat 420 and the second sliding seat 410 are pushed to separate them. After the first sliding seat 420 and the second sliding seat 410 are separated, the tension spring 502 will pull the first limiting plate 590, so that the baffle 570 re-seals the opening of the second limiting groove 710. This makes it convenient for the construction workers to release the locking state between the first sliding seat 420 and the second sliding seat 410.
[0038] In this embodiment, scale marks 250 are provided on the upper surfaces of both the first guide plate 230 and the second guide plate 270.
[0039] In this embodiment, the scale mark 250 represents the rotation angle. The scale mark is directly set on the upper surfaces of the first guide plate 230 and the second guide plate 270. When the second sliding seat 410 slides along the guide interval 260 with the pier column, the operator can intuitively and in real-time read the angle that has been rotated by observing the scale mark corresponding to the edge of the second sliding seat 410. This eliminates the need for electronic devices and is unaffected by obstructed viewing angles. The scale mark directly reflects the arc length from the 0° starting position to the corresponding angle position. During installation, simply moving the first sliding seat 420 to the design angle position corresponding to the scale mark completes the positioning, eliminating the need for complex measurement calculations. This results in high installation accuracy and speed. Both the first guide plate 230 and the second guide plate 270 are equipped with scale marks 250, which can be observed by the operator from both sides at the same time to verify each other, improve the accuracy of readings, and avoid misjudgment caused by parallax on one side.
[0040] In this embodiment, the first upright 630 has a plurality of first reinforcing plates 620 distributed circumferentially along the side wall of the first upright 630, and a plurality of first bolt holes 640 are provided at the first base plate 650; the second upright 503 has a plurality of second reinforcing plates 530 distributed circumferentially along the side wall of the second upright 503; and a plurality of second bolt holes 510 are provided at the second base plate 520.
[0041] Through this embodiment, the first reinforcing plate 620 and the second reinforcing plate 530 can better improve the overall structural strength of the second sliding seat 410 and the first sliding seat 420.
[0042] In this embodiment, a buffer assembly 120 for cooperating with the second reinforcing plate 530 is provided above the guide section 260. The buffer assembly 120 includes a mounting block 920, an mounting cavity 1004 inside the mounting block 920, and two mounting holes 1003 communicating with the mounting cavity 1004 on the side wall of the mounting block 920. Two first buffer blocks 960 and second buffer blocks 940 passing through the mounting holes 1003 are provided inside the mounting cavity 1004. A connecting plate 1001 for connecting the first buffer blocks 960 and the second buffer blocks 940 is also provided inside the mounting cavity 1004. A second spring 1002 for pressing the connecting plate 1001 is provided at the bottom of the connecting plate 1001. A cover plate 910 connected to the mounting block 920 and used to seal the opening of the mounting cavity 1004 is provided above the mounting block 920. On the outer side walls of the first guide plate 230 and the second guide plate 270, there are first reinforcing blocks 240 and second reinforcing blocks 280 respectively arranged at intervals along their length direction; adjacent first reinforcing blocks 240 and the first guide plate 230 together form a first limiting interval; adjacent second reinforcing blocks 280 and the second guide plate 270 together form a second limiting interval; at the end face of the mounting block 920 away from the cover plate 910, there are a plurality of first connecting feet 950 and second connecting feet 930 respectively extending into the first limiting interval and the second limiting interval.
[0043] In this embodiment, after the construction workers have fixed the first sliding seat 420 and the base 110, they install the buffer assembly 120 above the base 110 and on one side of the first sliding seat 420 to block the second sliding seat 410. When installing the buffer assembly 120, the second connecting foot 930 and the first connecting foot 950 below the mounting block 920 are respectively inserted into the first limiting interval and the second limiting interval on the first guide plate 230 and the second guide plate 270 for limiting. When the second sliding seat 410 moves toward the buffer assembly 120 along with the pier, the first buffer block 960 and the buffer assembly 120... The second buffer block 940 will first contact the second reinforcing plate 530 on the second sliding seat 410. During the movement of the second sliding seat 410, the second sliding seat 410 will squeeze the first buffer block 960 and the second buffer block 940. At this time, the second spring 1002 in the mounting cavity 1004 will provide a reaction force to the connecting plate 1001, thereby slowing down the movement speed of the second sliding seat 410. This allows the buffer assembly 120 to provide smooth deceleration buffer at the end of the stroke, avoiding rigid impact. It also reduces damage to the connection between the first sliding seat 420 and the second sliding seat 410, as well as damage to the locking post 580.
[0044] When the installer installs the buffer assembly 120, the cover plate 910 above the mounting block 920 can be opened, and then the second spring 1002, the first buffer block 960, the second buffer block 940 and the connecting plate 1001 can be placed into the mounting cavity 1004. Finally, the cover plate 910 and the mounting block 920 can be welded together.
[0045] The first reinforcing block 240 and the second reinforcing block 280 can further strengthen the structural strength of the first guide plate 230 and the second guide plate 270, and can also form the first limiting interval and the second limiting interval for fixing the buffer assembly 120. When the construction personnel need to remove the buffer assembly 120, they only need to lift the buffer assembly 120 upwards so that the second connecting foot 930 and the first connecting foot 950 below the buffer assembly 120 are disengaged from the first limiting interval and the second limiting interval.
[0046] In this embodiment, the inner sidewalls of the first guide plate 230 and the second guide plate 270 are respectively provided with two first guide grooves 310 and second guide grooves 320 arranged along their length direction, into which the first circular plate 610 and the second circular plate 560 extend.
[0047] In this embodiment, the first circular plate 610 and the second circular plate 560 move along the first guide groove 310 and the second guide groove 320 on the first guide plate 230 and the second guide plate 270, making the first sliding seat 420 and the second sliding seat 410 more stable when moving.
[0048] This embodiment provides a method for synchronous rotation construction of a bridge, including the aforementioned rotation auxiliary device, and the steps are as follows. S1. Construction of the Rotation Support System The main rotating pier and its lower turntable, upper turntable, and rotating support system are constructed on both sides of the existing railway. The rotating support system includes ball joints and traction steel strands. Specifically, the pile foundation and pile cap are constructed first. The lower turntable is poured on the pile cap and the lower ball joint is installed, ensuring that the center of the ball joint coincides with the design rotation center and the height difference between the top surfaces is no more than 1 mm. After embedding polytetrafluoroethylene sliding plates on the lower ball joint and applying grease, the upper ball joint and the center positioning pin are hoisted to make the upper and lower ball joints fit together. Then, the upper turntable reinforcement is tied, the traction steel strands are symmetrically embedded and their anchor ends are fixed, and the upper turntable concrete is poured. Finally, the support feet are installed at the bottom of the upper turntable, leaving a 20 mm gap with the slide rail on the top surface of the lower turntable, thus completing the construction of the rotating support system. S2, Cast-in-place beam segment After the concrete of the upper turntable reaches the design strength, the main pier for rotation is constructed on the top surface of the upper turntable. The vertical steel bars of the main pier are connected to the reserved steel bars of the upper turntable. After the formwork is erected, the concrete of the main pier is poured as a whole, so that the bottom of the main pier is fixed to the upper turntable. On the rotating main pier, T-shaped beam segments are symmetrically poured using a hanging basket cantilever to form the beam segments to be rotated. Specifically, the hanging basket is assembled on the block at the top of the main pier. Then, with the block at the top of the main pier as the center, the beam segments are poured symmetrically to both sides in sequence. After each segment is poured, the prestressed steel strands of that segment are tensioned to keep the beam in a cantilever state and maintain stress balance until all the designed segments are poured, forming a complete T-shaped beam segment to be rotated. S3, Weighing and Balancing Test After the beam is poured, a weighing and balancing test is conducted to determine the unbalanced moment. Based on the test results, counterweights are added to the beam. Specifically, jacks and displacement sensors are symmetrically arranged below the upper turntable of the main rotating pier. The jacking force is applied in stages to measure the critical force when the rotating structure changes from a static friction state to a dynamic friction state. The actual unbalanced moment and eccentricity are calculated. Based on the calculation results, counterweights are added to the lighter end of the beam to control the center of gravity offset within the range of 5cm to 15cm. S4, Bridge Rotation First, the base 110 is fixed to the ground via the column 220, so that the arc center of the guide section 260 coincides with the rotation center of the pier. Then, the arc length position that the first sliding seat 420 needs to be fixed in the guide section 260 is calculated according to the design rotation angle, and the first sliding seat 420 is fixedly installed at the arc length position on the ground. Then, the second sliding seat 410 is fixedly connected to the bottom of the pier. Then, a hydraulic synchronous automatic continuous traction system is used to drive the left and right rotating beams to rotate synchronously counterclockwise during the railway closure window. During the rotation, the second sliding seat 410 slides along the guide section 260 with the pier. When the second sliding seat 410 slides to directly above the first sliding seat 420, the second sliding seat 410 and the first sliding seat 420 are aligned vertically, and the locking mechanism is automatically triggered to lock the first sliding seat 420 and the second sliding seat 410 together, thereby preventing the pier from continuing to rotate through the fixed anchoring effect of the first sliding seat 420. S5, Remove auxiliary devices After the rotation is in place, confirm that the locking mechanism has been effectively locked, seal the upper and lower turntables, complete the system conversion, and remove the rotation auxiliary device.
[0049] Through this embodiment, the combination of the device and method allows the rotation to be completed by relying on the guide plate scale even when the electronic monitoring system fails, and the risk of over-rotation is prevented by automatic locking when in position. The second sliding seat 410 slides with the pier column to the preset position of the first sliding seat 420 and triggers locking, eliminating the need for manual judgment and operation, thereby eliminating human error and reaction delay; thus significantly improving the safety, convenience and reliability of construction.
[0050] In this embodiment, a counterweight is applied to the lighter end of the beam. The counterweight can be a sandbag, a water tank, or a precast concrete block. During the application of the counterweight, the height difference between the two ends of the beam is monitored in real time until the height difference between the two ends does not exceed ±5% of the design value.
[0051] In this embodiment, sandbags, water tanks, and precast blocks can be added or removed in stages as needed, facilitating real-time adjustments on-site. Closed-loop control by monitoring elevation changes ensures that the center of gravity offset falls precisely within the design allowable range, avoiding insufficient or excessive counterweight. Meanwhile, materials such as sandbags and water tanks are readily available, inexpensive, and reusable.
[0052] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.
[0053] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, they should all fall within the protection scope of the present invention.
Claims
1. A rotation assist device, characterized in that: The device includes a main body (100), which includes a base (110) and two columns (220) for connecting to the ground. Two parallel and arc-shaped first guide plate (230) and second guide plate (270) are provided between the two columns (220). The first guide plate (230), the second guide plate (270) and the two columns (220) together form a guide section (260). A first sliding seat (420) for connecting to the ground and sliding along the guide section (260) is provided below the guide section (260). A second sliding seat (410) for connecting to the pier and sliding along the guide section (260) is provided above the guide section (260). A locking mechanism is provided at the second sliding seat (410) for connecting the first sliding seat (420) and the second sliding seat (410) when the second sliding seat (410) passes above the first sliding seat (420).
2. The rotation assist device according to claim 1, characterized in that: The first sliding seat (420) includes a first base plate (650) and a first upright (630) arranged perpendicular to the first base plate (650); the end of the first upright (630) away from the first base plate (650) is provided with a first circular plate (610) extending into the guide section (260), and the upper end of the first circular plate (610) extends downward to form a first limiting groove (730) arranged along the length direction of the first upright (630); The second sliding seat (410) includes a second base plate (520) and a second upright (503) perpendicular to the second base plate (520); the end of the second upright (503) away from the second base plate (520) is provided with a second circular plate (560) extending into the guide section (260); the upper end of the second circular plate (560) extends downward to form a second limiting groove (710) along the length direction of the second upright (503); the locking mechanism includes a locking pin (580) provided in the second limiting groove (710); the second circular plate (560) is provided with a baffle (570) for blocking the locking pin (580), and a baffle for supplying the baffle. (570) A limiting hole (830) through which the baffle (570) passes; a first limiting plate (590) is provided at one end of the baffle (570), and limiting rods (501) are provided on both sides of the baffle (570) to connect with the side wall of the second circular plate (560) and pass through the first limiting plate (590); a tension spring (502) is sleeved on the limiting rod (501), and the two ends of the tension spring (502) are respectively connected to the first limiting plate (590) and the second circular plate (560); a fixing plate (660) for pushing the baffle (570) to move is provided at the side wall of the first circular plate (610); a through hole (820) for the locking pin (580) to pass through is provided at the baffle (570).
3. The rotation assist device according to claim 2, characterized in that: The end of the limiting rod (501) that passes through the first limiting plate (590) is provided with a second limiting plate (840).
4. The rotation assist device according to claim 2, characterized in that: The second limiting groove (710) is provided with a first spring (720) for pushing the locking post (580) out of the second limiting groove (710); the side wall of the second upright (503) is provided with a strip-shaped through hole (540) arranged along the length direction of the second upright (503); the side wall of the locking post (580) is provided with a connecting block passing through the strip-shaped through hole (540); the end of the connecting block away from the locking post (580) is provided with a third limiting plate (550).
5. A rotation assist device according to claim 1, characterized in that: Both the first guide plate (230) and the second guide plate (270) have scale markings (250) on their upper surfaces.
6. A rotation assist device according to claim 2, characterized in that: The first upright (630) has multiple first reinforcing plates (620) distributed circumferentially along the side wall of the first upright (630), and multiple first bolt holes (640) at the first base plate (650); the second upright (503) has multiple second reinforcing plates (530) distributed circumferentially along the side wall of the second upright (503); and multiple second bolt holes (510) at the second base plate (520).
7. A rotation assist device according to claim 6, characterized in that: A buffer assembly (120) for cooperating with the second reinforcing plate (530) is provided above the guide section (260). The buffer assembly (120) includes a mounting block (920), and a mounting cavity (1004) is provided inside the mounting block (920). Two mounting holes (1003) communicating with the mounting cavity (1004) are provided on the side wall of the mounting block (920). Two first buffer blocks (960) and second buffer blocks (940) passing through the mounting holes (1003) are provided inside the mounting cavity (1004). A connecting plate (1001) for connecting the first buffer blocks (960) and the second buffer blocks (940) is also provided inside the mounting cavity (1004). A second spring (1002) for pressing the connecting plate (1001) is provided at the bottom of the connecting plate (1001). A cover plate (910) connected to the mounting block (920) and used to seal the opening of the mounting cavity (1004) is provided above the mounting block (920). On the outer side walls of the first guide plate (230) and the second guide plate (270), there are first reinforcing blocks (240) and second reinforcing blocks (280) spaced apart along their length direction; adjacent first reinforcing blocks (240) and the first guide plate (230) together form a first limiting interval; adjacent second reinforcing blocks (280) and the second guide plate (270) together form a second limiting interval; at the end face of the mounting block (920) away from the cover plate (910), there are multiple first connecting feet (950) and second connecting feet (930) that extend into the first limiting interval and the second limiting interval respectively.
8. A rotation assist device according to claim 2, characterized in that: The first guide plate (230) and the second guide plate (270) are respectively provided with two first guide grooves (310) and second guide grooves (320) arranged along their length direction on the inner sidewalls, into which the first circular plate (610) and the second circular plate (560) extend.
9. A method for synchronous rotation construction of a bridge, comprising a rotation auxiliary device as described in any one of claims 1-8, comprising the following steps: S1. Construction of the Rotation Support System The main rotating pier and its lower turntable, upper turntable, and rotating support system are constructed on both sides of the existing railway. The rotating support system includes ball joints and traction steel strands. Specifically, the pile foundation and pile cap are constructed first. The lower turntable is poured on the pile cap and the lower ball joint is installed, ensuring that the center of the ball joint coincides with the design rotation center and the height difference between the top surfaces is no more than 1 mm. After embedding polytetrafluoroethylene sliding plates on the lower ball joint and applying grease, the upper ball joint and the center positioning pin are hoisted to make the upper and lower ball joints fit together. Then, the upper turntable reinforcement is tied, the traction steel strands are symmetrically embedded and their anchor ends are fixed, and the upper turntable concrete is poured. Finally, the support feet are installed at the bottom of the upper turntable, leaving a 20 mm gap with the slide rail on the top surface of the lower turntable, thus completing the construction of the rotating support system. S2, Cast-in-place beam segment After the concrete of the upper turntable reaches the design strength, the main pier for rotation is constructed on the top surface of the upper turntable. The vertical steel bars of the main pier are connected to the reserved steel bars of the upper turntable. After the formwork is erected, the concrete of the main pier is poured as a whole, so that the bottom of the main pier is fixed to the upper turntable. On the rotating main pier, T-shaped beam segments are symmetrically poured using a hanging basket cantilever to form the beam segments to be rotated. Specifically, the hanging basket is assembled on the block at the top of the main pier. Then, with the block at the top of the main pier as the center, the beam segments are poured symmetrically to both sides in sequence. After each segment is poured, the prestressed steel strands of that segment are tensioned to keep the beam in a cantilever state and maintain stress balance until all the designed segments are poured, forming a complete T-shaped beam segment to be rotated. S3, Weighing and Balancing Test After the beam is poured, a weighing and balancing test is conducted to determine the unbalanced moment. Based on the test results, counterweights are added to the beam. Specifically, jacks and displacement sensors are symmetrically arranged below the upper turntable of the main rotating pier. The jacking force is applied in stages to measure the critical force when the rotating structure changes from a static friction state to a dynamic friction state. The actual unbalanced moment and eccentricity are calculated. Based on the calculation results, counterweights are added to the lighter end of the beam to control the center of gravity offset within the range of 5cm to 15cm. S4, Bridge Rotation First, the base (110) is fixed to the ground via the column (220), so that the arc center of the guide section (260) coincides with the rotation center of the pier. Then, the arc length position that the first sliding seat (420) needs to be fixed in the guide section (260) is calculated according to the design rotation angle, and the first sliding seat (420) is fixedly installed at the arc length position on the ground. Then, the second sliding seat (410) is fixedly connected to the bottom of the pier. Then, a hydraulic synchronous automatic continuous traction system is used to drive the pier during the railway closure window. The two rotating beams on the left and right sides rotate counterclockwise synchronously. During the rotation, the second sliding seat (410) slides along the guide section (260) with the pier column. When the second sliding seat (410) slides to the top of the first sliding seat (420), the second sliding seat (410) and the first sliding seat (420) are aligned vertically. The locking mechanism is automatically triggered to lock the first sliding seat (420) and the second sliding seat (410) together, thereby preventing the pier column from continuing to rotate through the fixed anchoring effect of the first sliding seat (420). S5. Dismantle auxiliary devices After the rotation is in place, confirm that the locking mechanism has been effectively locked, seal the upper and lower turntables, complete the system conversion, and remove the rotation auxiliary device.
10. A bridge synchronous rotation construction method according to claim 9, characterized in that: A counterweight is applied to the lighter end of the beam. The counterweight can be a sandbag, a water tank, or a precast concrete block. During the application of the counterweight, the height difference between the two ends of the beam is monitored in real time until the height difference between the two ends does not exceed ±5% of the design value.