Device and method for controlling posture of unbalanced rotation process of cable-stayed rotating bridge

Abstract

The present invention belongs to the technical field of rotating bridge construction, and specifically relates to a device and method for controlling the posture of an unbalanced rotating cable-stayed rotating bridge. The device comprises a circular slideway disposed between an upper rotating body and a lower rotating body; a sliding assembly, eight of which are evenly arranged on the slideway. The sliding assembly comprises: a footboard disposed below a beam; a sliding steel pad disposed in the forward direction of the bottom of the footboard; and a polytetrafluoroethylene plate disposed between the slideway and the sliding steel pad. While being able to fully control the posture of the bridge during rotation, the present invention overcomes the problems existing in conventional operating methods, achieving a smooth rotation of the bridge at minimal cost and in the simplest operating method.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotating bridge construction, and in particular relates to a device and method for controlling the posture of an unbalanced rotating process of a cable-stayed rotating bridge. Background Art

[0002] The original intention of designing a rotating bridge was to enable crossing structures in the shortest possible time and minimize the impact of construction on adjacent facilities. The bridge's tilt during rotation must be strictly controlled to ensure adequate clearance between the rotating beam and existing structures beneath it. The commonly used construction methods for controlling clearance during rotation for existing rotating bridges are: 1. Control the bridge's balance. Precisely measure the bridge's unbalanced weight before rotation, accurately calculate the bridge's counterweight tonnage and location, and use counterweights to achieve a fully balanced rotation state, even when the bridge is capable of unbalanced rotation. This allows for smooth rotation and avoids tilting. 2. Temporarily remove or lower any structures beneath the bridge that could collide with a tilted bridge. This increases clearance during rotation, improves safety, and prevents collisions between the bridge and structures beneath the beam if the superstructure tilts during rotation. ③ Adjust the tilt direction of the rotating bridge. Before the rotation, the entire rotating bridge is tilted toward the side opposite the required clearance height by using jacks at the bottom of the turntable. This lifts the beam section on the side requiring clearance, effectively ensuring the bridge's clearance height and preventing collisions with underlying structures during the rotation. Conventional methods are relatively straightforward and are often the first approach considered when controlling the bridge's rotational position. However, they also have several drawbacks. ① To achieve a fully balanced rotation, a large amount of counterweight is required, and both loading and unloading are time-consuming and labor-intensive. Furthermore, while theoretically achieving a balanced state, this method is not 100% guaranteed. Conditions vary greatly during the rotation process, and tilt may occur due to other factors. ② Removing structures at the bottom of the rotating bridge may seem effective, but not all structures can be removed. Furthermore, maintaining clearance height by demolishing buildings defeats the design intent of the rotating bridge. ③ The rotating bridge is adjusted to the opposite side by jacking, where the clearance height needs to be strictly controlled. Past experience shows that this method is feasible to a certain extent, but it also has certain risks. Although the bridge has been adjusted to the opposite side before the rotation, it may still tilt in the opposite direction due to other reasons during the rotation. Although the probability is relatively small, this possibility still exists. Even if the rotation is successfully completed by adjusting the direction before the rotation, the bridge posture needs to be adjusted by jacking after the rotation. Summary of the Invention

[0003] In order to fully control the posture of the bridge during rotation, overcome the disadvantages of conventional operation methods, and achieve smooth rotation of the bridge with minimal cost and simplest operation methods, the present invention provides a posture control device and method for the unbalanced rotation process of a cable-stayed rotating bridge.

[0004] The present invention adopts the following technical solution: a device for controlling the posture of an unbalanced rotation process of a cable-stayed rotating bridge, comprising:

[0005] The slideway is circular and is arranged on the top surface of the lower support platform and is connected to the lower support platform as a whole;

[0006] Sliding components, 8 of which are provided, the projected midline of the sliding components coincides with the midline of the slideway, and are connected to the upper turntable as a whole, and the sliding components include:

[0007] The support legs are anchored in the upper turntable and rotate together with the upper turntable, and the bottom of the support legs is fixed with a support walking board;

[0008] A sliding steel plate, which is arranged at the bottom of the support walkway on the elevation side of the rotating beam and is placed on the slideway, and its moving direction is consistent with the rotation direction of the bridge;

[0009] The polytetrafluoroethylene plate is arranged between the slideway and the sliding steel pad or the other foot support walking board without the sliding steel pad, and is fastened to the forward end of the foot support walking board.

[0010] In some embodiments, the bottom of the sliding steel plate in the forward direction is cut into a groove, and a stiffening plate is provided above the sliding steel plate in the forward direction.

[0011] In some embodiments, the total thickness of the sliding steel plate + polytetrafluoroethylene plate is t, t=h×d / L, where the cantilever length of the rotating bridge is L, the distance between the support leg and the center of the rotation is d, and the height of the cantilever beam end needs to be controlled to be h during the rotation process.

[0012] A construction method for a posture control device for an unbalanced rotation process of a cable-stayed rotating bridge, comprising:

[0013] S1: Prepare for rotation construction;

[0014] S2: Conduct a trial rotation to detect any abnormalities in key stress-bearing parts in real time. If any problems are found, stop the trial rotation immediately. Rotation construction can only be carried out after the problems are completely eliminated.

[0015] S3: Perform formal rotation;

[0016] S4: After the rotation is completed, the rotation position monitoring and the rotation bridge posture adjustment are carried out.

[0017] Step S1 includes:

[0018] S11: Construction of the rotating box girder is complete. The bridge deck is cleared of floating and easily falling objects, and the reinforcement bars at the beam ends are checked to see if they are obstructing the rotation.

[0019] S12: Ball joint preparation: remove the sand box, remove the sand box between the upper and lower turntables, clean all the garbage on the slide, and use high-pressure water to wash to ensure the top surface of the slide is clean;

[0020] S13: Slide preparation:

[0021] 1) Slide cleaning: Clean the slide surface and remove rust from the ring steel plate. Use high-pressure air to clean the reserved gap between the slide and the support legs.

[0022] 2) Slideway inspection: Check the smoothness of the slideway; check the gap between the slideway and the support legs; check the path that the support legs pass through within the rotation range, and perform an appearance inspection on the support legs to check for damage;

[0023] 3) Install the medium: Place the PTFE slide under the support foot with the PTFE side facing down, and apply lubricating oil on the slide to reduce friction.

[0024] Step S2 includes:

[0025] S21: Release the temporary consolidation of the beam;

[0026] S22: beam body starts;

[0027] S23: Turn to 3° during trial rotation;

[0028] S24: Inching 1°, perform 5 10s inching, 5 5s inching, and 5 3s inching respectively. The surveyor measures the arc length displacement of the beam end after each inching and records the relevant data. If the displacement of the beam end is irregular and the dispersion is large after several inching, perform more inching.

[0029] S25: After the inching operation is completed and recorded, the bridge is rotated to a predetermined trial rotation angle of 5 degrees;

[0030] S26: Temporary consolidation of beam body.

[0031] Step S3 includes:

[0032] S31: Perform a horizontal rotation, observe the angle of rotation, and report to the on-site supervisor every 5°. During the last 5°, report to the on-site commander every 1°. Within 2m before the closure of the center axis of the bridge deck ends, the monitoring staff will begin reporting monitoring data to the control console in a countdown, reporting every 10cm; within 30cm, report every 1cm.

[0033] S32: When the rotating structure approaches the designed position, the system "pauses" to prevent the structure from over-rotating. After the inertial operation ends, the power system switches from "manual" mode to jog operation. Each time the jog operation is performed, the surveyor measures and reports the current status of the axis movement, and the cycle is repeated until the structural axis is accurately positioned.

[0034] S33: Positioning. After the swivel is in place, accurately adjust the tilt position of the swivel and use wedges to wedge and fix it between the support footboard and the slide. Each support footboard is equipped with 4 wedges to prevent the beam from swinging under external force.

[0035] Step S33 further includes:

[0036] After the rotating body is in place, tighten the iron wedges in the forward direction of the support legs and check whether there are any omissions. After completion, weld and fix them. When over-rotation is found during re-measurement due to rotational inertia or measurement error, the force couple boosting system composed of jacks can be used to push the support legs and the board in the opposite direction to make the rotating body rotate back to the designed position.

[0037] Step S4 includes:

[0038] S41: Linear measurement, adjustment of lateral inclination, axial lateral and longitudinal deviations. After the pad locking and plane positioning between the upper and lower plates are completed, the rotating structure is precisely positioned and the structure is constrained and fixed.

[0039] S42: Elevation adjustment is performed by using a jack between the upper and lower platforms. After precise adjustment, the elevation error is controlled within 1 cm.

[0040] S43: The turntable on the swivel has eight pairs of sliding components. Iron wedges are used to secure the gap between the welded steel plate under the foot support and the 35mm stainless steel plate on the slide. The pre-buried steel bars of the upper and lower turntables are welded to ensure the precise positioning of the structure and prevent slight deviation.

[0041] S44: Concrete is poured to seal the turntable, consolidating the structure in the shortest possible time. After the turntable is in place, the upper surface of the lower turntable is cleaned, the reserved steel bars are welded, and the formwork is erected to pour sealing concrete, connecting the upper and lower turntables into one.

[0042] Compared with the existing technology, the purpose of the present invention is to use a simple tool that can fully control the posture of the bridge during rotation, overcome the disadvantages of conventional operation methods, and achieve smooth rotation of the bridge at the lowest cost and simplest operation method. At the same time, this tool is simple to manufacture, low in cost, and can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of the attitude control device during the unbalanced rotation process of the cable-stayed rotating bridge;

[0044] Figure 2 Schematic diagram of the sliding assembly structure;

[0045] In the figure, 1- slideway, 2- foot support walkway, 3- sliding steel pad, 4- polytetrafluoroethylene plate. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] like Figure 1 、 2 As shown, a device for controlling the posture of an unbalanced rotation process of a cable-stayed rotating bridge comprises:

[0048] The slide 1 is circular and is arranged on the top surface of the lower support platform and connected to the lower support platform as a whole;

[0049] The sliding assembly, whose projected centerline coincides with the centerline of the slideway and is connected to the upper turntable as a whole, includes:

[0050] Support legs, 8 of which are evenly arranged and anchored in the upper turntable, rotating with the upper turntable;

[0051] The foot support walking board 2 is located at the bottom of the foot support and is fixed to the foot support;

[0052] Sliding steel plate 3, which is set at the bottom of the support walkway on the side where the elevation of the rotating beam needs to be strictly controlled, and is placed on the slideway. Its moving direction is consistent with the direction of bridge rotation;

[0053] The polytetrafluoroethylene plate 4 is arranged between the slideway and the sliding steel pad or the other foot support walking board without the sliding steel pad, and is fastened to the forward end of the foot support walking board with a wire.

[0054] The bottom of the sliding steel plate 3 in the forward direction is cut into a groove, and a stiffening plate is arranged above the sliding steel plate 3 in the forward direction.

[0055] The total thickness of the sliding steel plate 3 + polytetrafluoroethylene plate 4 is t, t=h×d / L, where it is assumed that the cantilever length of the rotating bridge is L, the radius of the slide axis is d, and the height of the cantilever beam end needs to be controlled to be h during the rotation process.

[0056] Assuming that the cantilever length of the rotating bridge is L, the distance between the support leg and the rotation center is d, the height of the cantilever beam end that needs to be controlled during the rotation is h, and the support leg that needs to be supported is t, then the support height t=22mm is calculated by t=h*d / L, and the thickness of the polytetrafluoroethylene plate at the bottom of the support leg is 4mm, so t=18mm steel plate is used to make the sliding steel pad at the bottom of the support leg.

[0057] This sliding steel plate is welded from 18mm steel and 30mm steel plates, with a groove cut into the bottom of the plate in the direction of travel. The plate is placed between the bottom of the support footboard and the polytetrafluoroethylene plate at the top of the slideway, creating a tool that not only supports the foot but also slides with the foot.

[0058] This sliding steel plate is welded together from four 500×800×18mm steel plates and four 150×150×30mm triangular steel plates. These plates are welded together according to the designed shape and specially treated at the corresponding positions to form a sliding steel plate that can slide along with the swivel support legs.

[0059] Steel plates should be cut using a plasma cutter to ensure that the cut steel plates are flat and free of deformation, distortion, or burrs. After cutting, a 18mm steel plate should be cut into a 10x20mm groove on one side in the width direction to serve as the sliding groove for the sliding steel backing plate. A 10x10mm groove should be cut on both sides of the bevel edge of the triangular stiffener to serve as the weld for the fillet welds, primarily to improve weld quality.

[0060] Identify the support leg that requires strict control of the beam's downward deflection during the rotation process. Lay a Teflon slide plate 30cm wider on each side than the sliding steel plate on the slideway in the direction of the rotation leg's advance. Then, place the manufactured sliding steel plate on the Teflon plate and push it into the bottom of the support leg, centering it at the base. This way, during the rotation process, the Teflon slide plate and the sliding steel plate will move forward together on the slideway, pushed by the support leg's running board.

[0061] After the rotation is completed, use a jack to place it on the slide, lift the turntable until the sliding steel plate is no longer under pressure, then pull out the sliding steel plate and polytetrafluoroethylene plate at the bottom of the support leg, and they can be recycled later.

[0062] A construction method for a posture control device for an unbalanced rotation process of a cable-stayed rotating bridge, comprising:

[0063] S1: Prepare for rotation construction;

[0064] Step S1 includes:

[0065] S11: Construction of the rotating box girder is complete. Check the bridge deck for any floating or easily falling objects, and confirm whether the beam end reinforcements are obstructing the rotation.

[0066] S12: Ball joint preparation: remove the sand box, remove the sand box between the upper and lower turntables, clean the dry sand between the slide and the support legs, and use high-pressure water to rinse after removal to ensure cleanliness;

[0067] S13: Slide preparation:

[0068] 1) Slide cleaning: Clean the slide surface and remove rust from the ring steel plate. Use high-pressure air to clean the reserved gap between the slide and the support legs.

[0069] 2) Slideway inspection: Check the smoothness of the slideway; check the gap between the slideway and the support legs; check the path that the support legs pass through within the rotation range, and perform an appearance inspection on the support legs to check for damage;

[0070] 3) Install the medium: Place the PTFE slide under the support foot with the PTFE side facing down, and apply lubricating oil on the slide to reduce friction.

[0071] S2: Conduct a trial rotation to detect any abnormalities in key stress-bearing parts in real time. If any problems are found, stop the trial rotation immediately. Rotation construction can only be carried out after the problems are completely eliminated.

[0072] Step S2 includes:

[0073] S21: Release the temporary consolidation of the beam;

[0074] S22: beam body starts;

[0075] S23: Turn to 3° during trial rotation;

[0076] S24: Inching 1°, perform 5 10s inching, 5 5s inching, and 5 3s inching respectively. The surveyor measures the arc length displacement of the beam end after each inching and records the relevant data. If the displacement of the beam end is irregular and the dispersion is large after several inching, perform more inching.

[0077] S25: After the inching operation is completed and recorded, the bridge is rotated to a predetermined trial rotation angle of 5 degrees;

[0078] S26: Temporary consolidation of beam body.

[0079] S3: Perform formal rotation;

[0080] Step S3 includes:

[0081] S31: Perform a horizontal rotation, observe the angle of rotation, and report to the on-site supervisor every 5°. During the last 5°, report to the on-site commander every 1°. Within 2m before the closure of the center axis of the bridge deck ends, the monitoring staff will begin reporting monitoring data to the control console in a countdown, reporting every 10cm; within 30cm, report every 1cm.

[0082] S32: When the rotating structure approaches the designed position, the system "pauses" to prevent the structure from over-rotating. After the inertial operation ends, the power system switches from "manual" mode to jog operation. Each time the jog operation is performed, the surveyor measures and reports the current status of the axis movement, and the cycle is repeated until the structural axis is accurately positioned.

[0083] S33: Positioning. After the swivel is in place, accurately adjust the tilt position of the swivel and use wedges to wedge and fix it between the support footboard and the slide. Each support footboard is equipped with 4 wedges to prevent the beam from swinging under external force.

[0084] After the rotating body is in place, tighten the iron wedges in the forward direction of the support legs and check whether there are any omissions. After completion, weld and fix them. When over-rotation is found during re-measurement due to rotational inertia or measurement error, the force couple boosting system composed of jacks can be used to push the support legs and the board in the opposite direction to make the rotating body rotate back to the designed position.

[0085] S4: After the rotation is completed, the rotation position monitoring is carried out.

[0086] Step S4 includes:

[0087] S41: Linear measurement, adjustment of lateral inclination, axial lateral and longitudinal deviations. After the pad locking and plane positioning between the upper and lower plates are completed, the rotating structure is precisely positioned and the structure is constrained and fixed.

[0088] S42: Elevation adjustment is performed by using a jack between the upper and lower platforms. After precise adjustment, the elevation error is controlled within 1 cm.

[0089] S43: The turntable on the swivel has eight pairs of sliding components. Iron wedges are used to secure the gap between the welded steel plate under the foot support and the 35mm stainless steel plate on the slide. The pre-buried steel bars of the upper and lower turntables are welded to ensure the precise positioning of the structure and prevent slight deviation.

[0090] S44: Concrete is poured to seal the turntable, consolidating the structure in the shortest possible time. After the turntable is in place, the upper surface of the lower turntable is cleaned, the reserved steel bars are welded, and the formwork is erected to pour sealing concrete, connecting the upper and lower turntables into one.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for controlling the posture of an unbalanced rotation process of a cable-stayed rotating bridge, characterized in that: include: A slideway (1), wherein the slideway (1) is circular and is arranged on the top surface of the lower support platform and is connected to the lower support platform as a whole; Sliding components, wherein 8 sliding components are provided, the projected midline of the sliding components coincides with the midline of the slideway (1), and is connected to the upper turntable as a whole, and the sliding components include: A support leg (2), wherein the support leg (2) is anchored in the upper turntable and rotates together with the upper turntable, and a support foot board is fixed at the bottom of the support leg (2); A sliding steel pad (3), the sliding steel pad (3) being arranged at the bottom of the foot support walkway on the elevation side of the rotating beam and placed on the slideway (1), and its moving direction is consistent with the rotation direction of the bridge; A polytetrafluoroethylene plate (4), the polytetrafluoroethylene plate (4) being arranged between the slideway (1) and the sliding steel pad (3) or the remaining foot support walking plate not provided with the sliding steel pad (3), and being fastened to the forward end of the foot support walking plate; The sliding steel pad (3) is a detachable independent component, and forms a sliding fit with the foot support plate (2) through a groove structure; The polytetrafluoroethylene plate (4) is connected to the forward end of the foot support board by means of an iron wire; The total thickness of the sliding steel pad (3) + polytetrafluoroethylene plate (4) is t, t=h×d / L, wherein the cantilever length of the rotating bridge is L, the distance between the support leg (2) and the center of the rotating body is d, and the height of the cantilever beam end needs to be controlled to be h during the rotation process.

2. The device for controlling the posture of an unbalanced rotation process of a cable-stayed rotating bridge according to claim 1 is characterized in that: The bottom of the sliding steel pad (3) in the forward direction is cut into a groove, and a stiffening plate is provided above the sliding steel pad (3) in the forward direction.

3. A construction method for the unbalanced rotation process posture control device of the cable-stayed rotating bridge according to claim 1, characterized in that: include: S1: Prepare for the rotation construction. Before the rotation, calculate the total thickness t of the sliding steel pad (3) and the polytetrafluoroethylene plate (4) according to the formula t=h×d / L, where L is the cantilever length of the rotating bridge, d is the distance between the support leg and the center of the rotation, and h is the height of the beam end to be controlled; S2: Conduct a trial rotation to detect any abnormalities in key stress-bearing parts in real time. If any problems are found, stop the trial rotation immediately. Rotation construction can only be carried out after the problems are completely eliminated. S3: Perform formal rotation; S4: After the rotation is completed, the rotation position monitoring and the rotation bridge posture adjustment are carried out. After the rotation is completed, the sliding steel pad (3) and the polytetrafluoroethylene plate (4) are removed and recycled.

4. The construction method of the device for controlling the posture of the unbalanced rotation process of the cable-stayed rotating bridge according to claim 3 is characterized in that: The step S1 comprises: S11: Construction of the rotating box girder is complete. Check the bridge deck for any floating or easily falling objects, and confirm whether the beam end reinforcements are obstructing the rotation. S12: Ball joint preparation: remove the sand box, remove the sand box between the upper and lower turntables, clean the dry sand between the slide and the support legs, and use high-pressure water to rinse after removal to ensure cleanliness; S13: Slide preparation: 1) Slide cleaning: Clean the slide surface and remove rust from the ring steel plate. Use high-pressure air to clean the reserved gap between the slide and the support legs. 2) Slideway inspection: Check the smoothness of the slideway; check the gap between the slideway and the support legs; check the path that the support legs pass through within the rotation range, and perform an appearance inspection on the support legs to check for damage; 3) Install the medium: Place the PTFE slide under the support foot with the PTFE side facing down, and apply lubricating oil on the slide to reduce friction.

5. The construction method of the device for controlling the posture of the unbalanced rotation process of the cable-stayed rotating bridge according to claim 3 is characterized in that: The step S2 comprises: S21: Release the temporary consolidation of the beam; S22: beam body starts; S23: Turn to 3° during trial rotation; S24: Inching 1°, perform 5 10s inching, 5 5s inching, and 5 3s inching respectively. The surveyor measures the arc length displacement of the beam end after each inching and records the relevant data. If the displacement of the beam end is irregular and the dispersion is large after several inching, perform more inching. S25: After the inching operation is completed and recorded, the bridge is rotated to a predetermined trial rotation angle of 5 degrees; S26: Temporary consolidation of beam body.

6. The construction method of the device for controlling the posture of the unbalanced rotation process of the cable-stayed rotating bridge according to claim 4 is characterized in that: The step S3 comprises: S31: Perform a horizontal rotation, observe the angle of rotation, and report to the on-site supervisor every 5°. During the last 5°, report to the on-site commander every 1°. Within 2m before the closure of the center axis of the bridge deck ends, the monitoring staff will begin reporting monitoring data to the control console in a countdown, reporting every 10cm; within 30cm, report every 1cm. S32: When the rotating structure approaches the designed position, the system "pauses". To prevent the structure from over-rotating, it first uses inertia to run. Then the power system changes from "manual" state to jog operation. Each time the jog operation is performed, the surveyor measures and reports the current status data of the axis. This cycle is repeated until the structural axis is accurately in place. S33: Positioning. After the swivel is in place, accurately adjust the tilt position of the swivel and use wedges to wedge and fix it between the support footboard and the slide. Each support footboard is equipped with 4 wedges to prevent the beam from swinging under external force.

7. The construction method of the device for controlling the posture of the unbalanced rotation process of the cable-stayed rotating bridge according to claim 6 is characterized in that: The step S33 further includes: After the rotating body is in place, tighten the iron wedges in the forward direction of the support legs and check whether there are any omissions. After completion, weld and fix them. When over-rotation is found during re-measurement due to rotational inertia or measurement error, the force couple boosting system composed of jacks can be used to push the support legs and the board in the opposite direction to make the rotating body rotate back to the designed position.

8. The construction method of the device for controlling the posture of an unbalanced rotation process of a cable-stayed rotating bridge according to claim 4 is characterized in that: The step S4 comprises: S41: Linear measurement, adjustment of lateral inclination, axial lateral and longitudinal deviations. After the pad locking and plane positioning between the upper and lower plates are completed, the rotating structure is precisely positioned and the structure is constrained and fixed. S42: Elevation adjustment is performed by using a jack between the upper and lower platforms. After precise adjustment, the elevation error is controlled within 1 cm. S43: The turntable on the swivel has eight pairs of sliding components. Iron wedges are used to secure the gap between the welded steel plate under the foot support and the 35mm stainless steel plate on the slide. The pre-buried steel bars of the upper and lower turntables are welded to ensure the precise positioning of the structure and prevent slight deviation. S44: Carry out the sealing concrete pouring construction to complete the turntable structure consolidation in the shortest time. After the turntable is in place, clean the upper surface of the lower turntable, weld the reserved steel bars, and set up the mold to pour the sealing concrete to connect the upper turntable and the lower turntable into one.

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