A construction method for the combined spatial rotation of a bridge

Abstract

The present invention provides a combined construction method for spatial rotation of bridges, which relates to the technical field of bridge engineering construction. The combined construction method for spatial rotation of bridges includes the following steps: Step 1: Analysis of rotation postures; Step 2: Foundation construction; Step 3: Construction of the rotation system; Step 4: Construction of the upper structure; Step 5: Weighing, counterweight and trial rotation; Step 6: Horizontal rotation; Step 7: Posture conversion; Step 8: Fine adjustment of postures; Step 9: Cantilever casting of the remaining beam segments. The method provided by the present invention can effectively solve the problems that the construction process is restricted by obstacles, resulting in too large design longitudinal slopes and limited bridge type schemes. This method has simple steps, reasonable design, convenient construction, and is economical and effective, and can be applied to various bridge types such as continuous beams, T-shaped rigid frames, and cable-stayed bridges in highway, railway, and municipal engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering construction, and specifically to a bridge spatial rotation combined construction method. Background Art

[0002] With the continuous development of urban construction in China, the urban scale is constantly expanding, and a large number of basic transportation facilities such as railways, highways, and municipal roads are being built. The situation where various traffic projects intersect with each other is increasing. And the rotation construction has become one of the most efficient structural forms for building large-span bridges across railway operating lines, intersecting highways, canyons, and rivers.

[0003] During the bridge rotation process, the rotated part has to sweep through the area within the rotation radius, and there are often interference problems between the rotated part and obstacles such as overhead cables, power towers, and catenary poles; for bridges in the city, the route slope design is often restricted by boundaries such as the spacing of road intersections; for overpass bridges spanning multiple railway tracks, such as those near the station yard or in the parallel section of railway and highway, the increase in span will lead to an increase in beam height. To ensure the clearance requirement under the bridge during construction and operation, the requirement for slope elevation will also increase. Bridge design usually solves the above control factors by increasing the design elevation or relocating and reconstructing the obstacles. However, the conventional treatment methods increase the project scale and project risks, greatly increase the project investment, and the large longitudinal slope also has a greater impact on traffic efficiency and safety. Especially in the northern icing areas, it is easy to cause the braking force of vehicles on the bridge to decrease, forming a greater potential safety hazard.

[0004] In summary, there is currently a lack of a method that is simple in steps, reasonable in design, convenient in construction, economical and effective to solve the problems of excessive route longitudinal slope and limited bridge type scheme caused by obstacles during the construction process. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a bridge spatial rotation combined construction method, which solves the problem of interference between the bridge rotation process and buildings and structures.

[0007] (II) Technical Solutions

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A bridge spatial rotation combined construction method includes the following steps:

[0009] Step 1: Rotation attitude analysis

[0010] Analyze the control elevation during the bridge rotation process to determine the design attitude and construction attitude of the rotated part of the bridge.

[0011] Step 2: Foundation construction

[0012] Level the site, construct protection piles, excavate the foundation pit, and construct the main pier pile foundation. For the working condition of rotating at the bottom of the pier, the first part of the lower bearing platform concrete shall be poured; for the system of rotating at the top of the pier, after the bearing platform is constructed, the pier shall be constructed according to the designed attitude.

[0013] Step 3: Construction of the rotation system

[0014] The rotation system includes a lower turntable, a rotating bearing, an upper turntable, adjustable-height supporting feet, slideways, a boosting reaction seat, a traction reaction seat, a rotating bearing cushion stone, a slideway framework, and a reserved slideway installation notch. When rotating at the bottom of the pier is adopted, the rotation system is located between the upper and lower turntables; when rotating at the top of the pier is adopted, the rotation system is located between the beam bottom and the pier top.

[0015] Step 4: Construction of the superstructure

[0016] For the system of rotating at the bottom of the pier, after the rotation system is constructed, the pier, main beam, and bridge tower shall be constructed according to the construction attitude.

[0017] Step 5: Weighing, counterweighting, and trial rotation

[0018] Before rotation, the rotated part shall be weighed to measure its center of gravity position.

[0019] Step 6: Horizontal rotation

[0020] Conduct the formal horizontal rotation according to the construction attitude.

[0021] Step 7: Attitude conversion

[0022] After the horizontal rotation is completed, attitude conversion shall be carried out.

[0023] Step 8: Attitude fine-tuning

[0024] After the attitude conversion is completed, the beam segment shall be comprehensively measured and inspected to calculate the axis and elevation deviation. The deviation adjustment shall be carried out in the order of axis first and then elevation. It can be adjusted by continuously jacking the jacks in a jogging mode. After accurate positioning, the supporting feet can be used to install a limiting device to restrict the rotation of the structure. Fine-tuning jacks shall be installed between the upper and lower bearing platforms on both sides of the bridge axis symmetrically with respect to the center position of the turntable to fine-tune the inclination of the beam body in the transverse direction of the bridge and the elevation of the beam body in the longitudinal direction of the bridge. When fine-tuning the attitude, the alignment shall be given priority.

[0025] Step 9: Cantilever casting of the remaining beam segment

[0026] For the situation where there are other railways, highways, pipelines at the bridge site, or the obstacles cannot be crossed even through attitude conversion, after the rotation is completed, on the basis of the rotated beam segment, the remaining beam segment shall be continuously constructed by the method of cantilever casting.

[0027] Preferably, in Step 3, the specific operation is as follows:

[0028] (1) Install the rotating support cushion stone and the slideway skeleton on the first part of the lower turntable or at the pier top, and adjust their elevation and position;

[0029] (2) Pour the concrete of the second part of the lower turntable after reserving the slideway installation notch;

[0030] (3) Install the rotating support and the slideway. The centers of both the rotating support and the slideway are on the rotation axis, and their position elevations need to be precisely adjusted. The rotating support needs to meet the performance of the swing θ angle while satisfying the horizontal rotation;

[0031] (4) Construct the boosting reaction seat and the traction reaction seat;

[0032] (5) Install the support feet, embed the traction cables, pour the concrete of the upper turntable, and tension the steel tendons of the upper turntable; when installing the support feet, it is necessary to ensure that after the horizontal rotation is completed, a pair of symmetrically arranged support feet are located at positions perpendicular to the bridge axis;

[0033] (6) Temporarily seal the upper and lower turntables after the upper turntable is poured.

[0034] Preferably, in step (5), the specific method is as follows:

[0035] (1) Set up reaction frames, jacks, and sensors at the beam ends;

[0036] (2) Apply a load upward at one end to jack up the beam body, and record the jacking force of the sensor when the rotation occurs instantaneously;

[0037] (3) Obtain the moment by multiplying the jacking force by the lever arm;

[0038] (4) Deduce the bearing friction through the moment balance equation for the center of the bearing.

[0039] Preferably, in step (6), the specific steps are as follows:

[0040] (1) Tighten the horizontal rotation traction cables and hold the load when the cable force reaches the designed traction force;

[0041] (2) Start the boosting jacks and load them in 100 kN increments to the designed boosting force at symmetric positions at the center of the turntable;

[0042] (3) Continuously traction with the traction jacks until the structure starts to move, and make the entire rotating structure rotate horizontally at a uniform speed, with the horizontal rotation angular speed not greater than 0.02 rad / min;

[0043] (4) When the edge of the beam body approaches the side pier during horizontal rotation, install a limiting system between the upper and lower turntables simultaneously;

[0044] (5) When the center line of the rotating beam end is about 1 m from the designed position, reduce the oil supply of the traction cable jacks to decelerate the rotation;

[0045] When it is about 0.5 m away from the designed position, change to manual jogging operation.

[0046] (7) Continuously observe the center line of the beam end, command the oil pump station to jog until it coincides with the central axis of the beam body, add cushion blocks between the limit distribution beam and the support feet to prevent the rotating body from continuing to slide. At this point, the rotating body is basically in place.

[0047] Preferably, in step seven, the specific steps are as follows:

[0048] (1) Determine the adjustment value of the support foot height according to the position where the support foot is located.

[0049] (2) Loosen the bolts between the upper and lower parts of the support foot, extract the sandwich steel plate, and lower the support foot height to meet the gap requirement between the bottom of the support foot and the stainless steel plate of the slideway during attitude adjustment.

[0050] (3) Install a jack between the upper and lower turntables, and make the bridge axis vertically rotate by an angle θ around the rotation axis through the top beam to reach the designed attitude.

[0051] (III) Beneficial effects

[0052] The present invention provides a combined construction method for spatial rotation of a bridge. It has the following beneficial effects:

[0053] 1. The method provided by the present invention can guide engineering designers and constructors to successfully solve the problem of interference with obstacles during the construction of the rotating bridge, conveniently and quickly determine the bridge type scheme, and the provided construction method is safe, effective and highly feasible.

[0054] 2. When crossing railways, highways, power communication line equipment, it can meet the regulations of the management department in terms of policies and regulations, and can also meet the requirements of the property owners of the crossed lines and structures for protecting the safe operation of existing facilities.

[0055] 3. The method provided by the present invention adopts a combined construction method of rotation and cantilever casting. During the whole construction process, there is no need to set up temporary facilities such as scaffolds under the bridge. For the situation where there are obstacles during the horizontal rotation of the bridge, the elevation angle of the construction attitude is used to increase the height of the beam bottom, without the need to relocate and transform the obstacles, reducing the impact on the traffic under the bridge during the project implementation, reducing the bridge building height, improving the bridge landscape effect, and reducing the damage to the surrounding environment during construction.

[0056] 4. The method provided by the present invention can effectively reduce the slope of the approach bridge when the highway crosses the railway, improve the driving safety, and solve the problem that it is easy to cause traffic accidents due to too large a bridge deck slope in the case of road icing in winter in the north.

[0057] 5. The adjustable-height support feet provided by the present invention can efficiently and precisely adjust the height of the support feet in the narrow space between the upper and lower turntables. The support feet have clear force-bearing, simple operation, and high safety. This enables the attitude adjustment process to be completed quickly and accurately positioned, greatly improving the construction efficiency and saving the construction period.

[0058] 6. The method provided by the present invention solves the problem of excessive route gradient caused by crossing obstacles, thereby reducing the bridge height, shortening the bridge length, reducing temporary works, scaling down the project scale, saving investment, and having good social and economic benefits.

[0059] In summary, the method provided by the present invention can effectively solve the problems of excessive design longitudinal slope and limited bridge type plan caused by obstacles restricting the construction process. This method has simple steps, reasonable design, convenient construction, and is economical and effective, and can be applied to various bridge types such as continuous beams, T-shaped rigid frames, and cable-stayed bridges in highway, railway, and municipal engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 is a flow chart of the present invention;

[0061] Figure 2 is a schematic diagram of the rotating surface of the present invention;

[0062] Figure 3 is a schematic diagram of the swing of the rotating part of the present invention;

[0063] Figure 4 is a schematic diagram of the rotating system of the present invention;

[0064] Figure 5 is a construction attitude diagram of the rotating part of the present invention;

[0065] Figure 6 is a schematic diagram of the combination of cantilever casting and rotation of the present invention;

[0066] Figure 7 is an assembly diagram of the adjustable-height support feet of the present invention;

[0067] Figure 8 is an exploded view of the adjustable-height support feet of the present invention.

[0068] Among them, 201, lower turntable; 202, rotating support; 203, upper turntable; 204, support feet; 205, slideway; 206, boost reaction seat; 207, traction reaction seat; 208, rotating support cushion stone; 209, slideway skeleton; 210, reserved slideway installation notch;

[0069] 300, rotating part; 301, bridge pier; 302, main beam; 303, bridge tower;

[0070] 401, cantilever casting part; 402, highway; 403, railway;

[0071] 501. Upper support leg; 502. Anchor bolt; 503. Shimming washer for height adjustment; 504. Lower support leg; 505. Walking board. Specific implementation mode

[0072] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0073] Embodiment:

[0074] As Figure 1-8 shown, the embodiment of the present invention provides a combined construction method for spatial rotation of a bridge, including the following steps:

[0075] Step 1. Analysis of rotation attitude

[0076] Analyze the control elevation during the bridge rotation process to determine the design attitude and construction attitude of the bridge rotation part 300. As shown in the reference Figure 1 shown, when there is no obstacle, the rotation surface where the bridge rotation part 300 can reach the design position only by horizontal rotation is the design surface, and the attitude of the bridge on the design surface is the design attitude.

[0077] To cross the obstacle during rotation, the bridge rotation part 300 needs to rotate vertically by an angle θ around the rotation axis. The rotated design surface is the construction surface, and the attitude of the bridge within the construction surface is the construction attitude.

[0078] θ is the elevation angle required to cross the obstacle. To ensure the unity of the structural force form, the θ angle is generally between (0° - 3°).

[0079]

[0080] As shown in the reference Figure 2 shown, in the formula, H1 (m) is the elevation of the top of the obstacle crossed during the rotation process; H2 (m) is the design elevation of the lowest point of the beam bottom sweeping the top of the obstacle during the rotation process; H3 (m) is the design elevation of the center of the sliding surface of the rotation device; r (m) is the radius of the sliding surface of the rotation device; L1 (m) is the straight-line distance between the center of the sphere of the sliding surface of the rotation device and the top of the obstacle crossed.

[0081] Step 2: Foundation construction

[0082] Level the site, construct protection piles, excavate the foundation pit, and construct the main pier pile foundation. For the working condition of rotating at the bottom of the pier, the first part of the lower turntable concrete should be poured. For the system of rotating at the top of the pier, after the construction of the bearing platform, the pier should be constructed according to the designed attitude.

[0083] Step 3: Construction of the rotating system

[0084] The rotating system includes a lower turntable 201, a rotating bearing 202, an upper turntable 203, adjustable-height supporting feet 204, slideways 205, a boosting reaction seat 206, a traction reaction seat 207, a rotating bearing cushion stone 208, a slideway framework 209, and a reserved slideway installation notch 210. When rotating at the bottom of the pier is adopted, the rotating system is located between the upper and lower turntables; when rotating at the top of the pier is adopted, the rotating system is located between the bottom of the beam and the top of the pier.

[0085] (1) Position and install the rotating bearing cushion stone 208 and the slideway framework 209 on the first part of the lower turntable 201 or at the top of the pier, and adjust their elevations and positions.

[0086] (2) Pour the second part of the lower turntable 201 concrete after reserving the slideway installation notch 210.

[0087] (3) Install the rotating bearing 202 and the slideways 205. The centers of both the rotating bearing 202 and the slideways 205 are on the rotation axis, and their position elevations need to be precisely adjusted. The rotating bearing 202 needs to meet the performance of the swing θ angle while satisfying the horizontal rotation.

[0088] (4) Construct the boosting reaction seat 206 and the traction reaction seat 207.

[0089] (5) Install the supporting feet 204, embed the traction cables, pour the upper turntable 203 concrete, and tension the steel strands of the upper turntable 203. When installing the supporting feet 204, it is necessary to ensure that after the horizontal rotation is completed, a pair of symmetrically arranged supporting feet 204 are located at positions perpendicular to the bridge axis.

[0090] (6) After the pouring of the upper turntable 203 is completed, the upper and lower turntables need to be temporarily closed.

[0091] To meet the conversion of the 300 rotating part of the bridge from the construction attitude to the designed attitude, there needs to be a large adjustment space for the gap between the supporting feet and the stainless steel plates of the slideways. The present invention provides an adjustable-height supporting foot 204.

[0092] The supporting feet are divided into two types. The first type is a group of supporting feet installed at positions perpendicular to the main beam axis, which play a supporting role during the adjustment of the bridge attitude; the second type is the supporting feet whose heights need to be adjusted before the attitude adjustment.

[0093] The height-adjustable support leg 204 is divided into an upper support leg 501 and a lower support leg 504. The upper support leg 501 is pre-buried in the upper turntable 203. A height-adjusting gasket 503 is provided between the upper and lower support legs. The upper and lower support legs and the height-adjusting gasket 503 are anchored by anchor bolts 502. Sand or other materials are filled into the support leg steel pipe to enhance the bearing capacity. The bottom of the lower support leg 504 is a support footboard 505, which is supported on the lower slide stainless steel plate during rotation and is firmly welded to the support leg steel pipe.

[0094] For the first type of support legs, the height-adjusting spacer 503 can be made of steel plates of different thicknesses, either single or multiple, depending on the height adjustment amount. When the support leg height needs to be increased, the anchor bolts 502 can be loosened, the height-adjusting spacer 503 can be inserted, and the upper and lower support legs can be fastened with anchor bolts; when the support leg height needs to be lowered, the anchor bolts 502 can be loosened, the height-adjusting spacer 503 can be pulled out, and the anchor bolts 502 can be fastened.

[0095] For the second type of support leg, when posture adjustment is required, in order to meet the swing angle requirement, the lower support leg 504 can be replaced with a curved walking plate 505, and a support plate with a curved surface is welded at the corresponding position of the slideway steel plate. The axis of the curved surface of the support leg and the center of the sphere of the sliding surface are on the same axis.

[0096] Step 4: Superstructure construction

[0097] For the pier bottom rotation system, after the rotation system is constructed, the rotation part 300, the pier 301, the main beam 302, and the bridge tower 303 should be constructed according to the construction posture.

[0098] Step 5: Weighing, balancing and trial running

[0099] Before the rotation, the rotating part 300 must be weighed and its center of gravity position measured. The method is as follows:

[0100] (1) Set reaction frame, jack and sensor at the beam end;

[0101] (2) Apply a load upward at one end to lift the beam. When the swivel body rotates (judged by the displacement meter installed between the turntable and the pedestal), record the lifting force of the sensor.

[0102] (3) Obtain the moment through the lifting force and the lever arm;

[0103] (4) Calculate the support friction through the moment balance equation about the support center.

[0104] If necessary, counterweights should be added so that the weight of the entire rotating structure is mainly borne by the central support. Before the formal rotation, the rotating structure should be tested to measure various parameters such as the friction coefficient.

[0105] Step 6: Horizontal rotation

[0106] Conduct the formal horizontal rotation in the construction posture, and the specific steps are as follows:

[0107] (1) Tighten the horizontal rotation traction cable, and hold the load when the cable force reaches the designed traction force;

[0108] (2) Start the boosting jack, and load it in stages of 100 kN at the symmetric positions at the center of the turntable until the designed boosting force is reached;

[0109] (3) Continuously pull with the traction jack until the structure starts to move, and make the entire rotating structure rotate horizontally at a uniform speed, with the horizontal rotation angular velocity not greater than 0.02 rad / min;

[0110] (4) When the edge of the beam body approaches the side pier during horizontal rotation, install the limit system between the upper and lower turntables simultaneously;

[0111] (5) When the center line of the rotating beam end is about 1 m from the designed position, reduce the oil supply of the traction cable jack to decelerate the rotation;

[0112] (6) When it is about 0.5 m from the designed position, change to manual jogging operation;

[0113] (7) Continuously observe the center line of the beam end, and command the oil pump station to jog until the central axis of the beam body coincides. Add cushion blocks between the limit distribution beam and the support feet to prevent the rotating body from sliding continuously. At this point, the rotation is basically in place.

[0114] Step Seven: Posture Conversion

[0115] After the horizontal rotation is completed, conduct the posture conversion, and the specific steps are as follows:

[0116] (1) Determine the adjustment value of the support foot height according to the position of the support foot;

[0117] (2) Loosen the bolts between the upper and lower parts of the support foot, extract the sandwich steel plate, and reduce the support foot height to meet the gap requirement between the bottom of the support foot and the stainless steel plate of the slideway during posture adjustment;

[0118] (3) Install a jack between the upper and lower turntables, and make the bridge axis vertically rotate by an angle θ around the rotation axis through the top beam to reach the designed posture.

[0119] Step Eight: Posture Fine Tuning

[0120] After the posture conversion is completed, the beam segment should be comprehensively measured and inspected, and the axis and elevation deviations should be calculated. The deviation adjustment should be carried out in the order of axis first and then elevation. It can be adjusted by continuously jogging the jacks. After precise positioning, limit devices can be installed using the support feet to limit the rotation of the structure. Fine-tuning jacks should be installed between the upper and lower bearing platforms symmetrically on both sides of the bridge axis at the center of the turntable to precisely adjust the inclination of the beam body in the transverse direction of the bridge and the elevation of the beam body in the longitudinal direction of the bridge. During posture fine-tuning, the alignment should be the main consideration.

[0121] Step Nine: Cantilever casting of the remaining beam segments

[0122] For the situation where there are other railways 403, highways 402, pipelines, etc. at the bridge site, or the obstacles cannot be crossed through attitude conversion, the present invention adopts a bridge construction method combining swing construction and cantilever casting. After the swing is completed, on the basis of the swung part 300, the cantilever casting method is continued to construct the cantilever casting part 401.

[0123] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined construction method for spatial rotation of bridges, characterized in that, it includes the following steps: Step 1: Analysis of rotation attitude Analyze the control elevation during the bridge rotation process to determine the design attitude and construction attitude of the bridge rotation part; When there are no obstacles, the rotation plane where the bridge rotation part can reach the design position only through horizontal rotation is the design plane, and the attitude of the bridge on the design plane is the design attitude; To cross obstacles during rotation, the bridge rotation part needs to rotate vertically by an angle θ around the rotation axis. The rotated design plane is the construction plane, and the attitude of the bridge within the construction plane is the construction attitude; Step 2: Foundation construction Level the site, construct protective piles, excavate the foundation pit, and construct the main pier pile foundation. For the working condition of rotation at the bottom of the pier, the first part of the lower bearing platform concrete should be poured; for the system of rotation at the top of the pier, after the bearing platform is constructed, the pier should be constructed according to the design attitude; Step 3: Construction of the rotation system The rotation system includes a lower turntable, a rotation bearing, an upper turntable, adjustable-height supporting feet, slideways, a boosting reaction seat, a traction reaction seat, a rotation bearing cushion stone, a slideway framework, and a reserved slideway installation notch. When using rotation at the bottom of the pier, the rotation system is located between the upper and lower turntables; when using rotation at the top of the pier, the rotation system is located between the beam bottom and the pier top; Step 4: Construction of the upper structure For the system of rotation at the bottom of the pier, after the rotation system is constructed, the pier, main beam, and bridge tower should be constructed according to the construction attitude; Step 5: Weighing, counterweighting, and trial rotation Before rotation, the rotation part must be weighed to measure its center of gravity position; Step 6: Horizontal rotation Conduct the formal horizontal rotation in the construction attitude; Step 7: Attitude conversion Conduct attitude conversion after the horizontal rotation is completed; Step 8: Attitude fine-tuning After the attitude conversion is completed, the beam segment should be comprehensively measured and inspected, and the axis and elevation deviations should be calculated. The deviation adjustment should be carried out in the order of axis first and then elevation. It can be adjusted by continuously jacking the jacks in a jogging manner. After precise positioning, a limiting device can be installed using the supporting feet to limit the rotation of the structure. Fine-tuning jacks should be installed between the upper and lower bearing platforms on both sides of the bridge axis symmetrically with respect to the center of the turntable to precisely adjust the inclination of the beam body in the transverse direction of the bridge and the elevation of the beam body in the longitudinal direction of the bridge. When fine-tuning the attitude, the alignment should be the main consideration; Step 9: Cantilever casting of the remaining beam segments For the situation where there are other railways, highways, pipelines at the bridge site, or the obstacles cannot be crossed even through attitude conversion, after the rotation is completed, on the basis of the rotated beam segment, continue to construct the remaining beam segments by means of cantilever casting.

2. A combined construction method for spatial rotation of bridges according to claim 1, characterized in that: In the said Step 3, the specific operation is as follows: (1) Position and install the rotation bearing cushion stone and the slideway framework on the first part of the lower turntable or at the top of the pier, and adjust their elevation and position; (2) Pour the second part of the lower turntable concrete after reserving the slideway installation notch; (3) Install the rotation bearing and the slideway. The centers of both the rotation bearing and the slideway are on the rotation axis, and their position elevations need to be precisely adjusted. The rotation bearing needs to meet the performance of swinging at an angle θ while satisfying horizontal rotation; (4) Construct the boosting reaction seat and the traction reaction seat; (5) Install the support legs, embed the traction cables, pour the upper turntable concrete, and tension the upper turntable steel strands; when installing the support legs, it is necessary to ensure that after the horizontal rotation is completed, the symmetrically arranged pair of support legs are located perpendicular to the bridge axis; (6) After the upper turntable is cast, the upper and lower turntables need to be temporarily closed.

3. A bridge space rotation combined construction method according to claim 1, Features: In the step 5, the specific method is: (1) Set up reaction frame, jack and sensor at the beam end; (2) Apply a load upward at one end to lift the beam. When the swivel body rotates, record the lifting force of the sensor. (3) Calculate the moment through the lifting force and the lever arm; (4) Calculate the support friction through the moment balance equation about the support center.

4. A bridge space rotation combined construction method according to claim 1, Features: In step six, the specific steps are as follows: (1) Tighten the horizontal traction rope and hold the load when the rope force reaches the designed traction force; (2) Turn on the boost jack and load the design boost force in stages of 100 kN at the symmetrical position of the turntable center; (3) The traction jack is continuously pulled until the structure starts to move and the entire rotating structure rotates at a uniform speed, with the angular velocity of rotation not exceeding 0.02 rad / min; (4) When the beam is rotated horizontally to the edge close to the side pier, a limit system is installed between the upper and lower turntables; (5) When the center line of the rotating beam end is about 1m away from the design position, reduce the oil supply of the traction cable jack to slow down the rotation; (6) When it is 0.5m away from the design position, it is changed to manual jog operation; (7) Continuously observe the center line of the beam end, command the oil pump station to move until it coincides with the center axis of the beam, and add a pad between the limit distribution beam and the support leg to prevent the swivel from sliding further. At this point, the swivel is basically in place.

5. A bridge space rotation combined construction method according to claim 1, Features: In step seven, the specific steps are as follows: (1) Determine the height adjustment value of the support leg according to the position of the support leg; (2) Loosen the bolts between the upper and lower parts of the support leg, remove the interlayer steel plate, and lower the height of the support leg to meet the clearance requirements between the bottom of the support leg and the stainless steel plate of the slide when adjusting the posture; (3) A jack is installed between the upper and lower turntables, and the bridge axis is rotated vertically by an angle θ around the rotation axis through the top beam to reach the designed posture.

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