A construction method for installing super-large circular caisson bridge piers with the assistance of double floating bodies

Abstract

The present invention relates to the technical field of deep-water bridge construction, and specifically to a construction method for installing an extra-large circular caisson pier with the assistance of a double buoy. The method includes: outfitting of the double buoy, rough positioning of the caisson pier, conversion of the longitudinal and transverse adjustment system, loading of the double buoy lifting device, lowering of the caisson pier, precise positioning of the caisson pier, caisson pier placement, caisson pier acceptance re-adjustment, and separation of the double buoys. In general, the construction method of the invention has good installation stability for the caisson pier, and convenient and safe construction.

Description

Technical Field

[0001] The invention relates to the technical field of deep-water bridge construction, and in particular to a construction method for installing an extra-large circular caisson bridge pier with the assistance of double floating bodies. Background Art

[0002] Caisson bridge pier structure is an important foundation structure in deep-water bridge construction. Caisson bridge pier structure refers to a conical frame in which the expanded foundation of the bridge pier is a large-diameter caisson structure, and the diameter of the lower tower column gradually transitions from the bottom to the upper end. The lower tower column and the caisson structure are prefabricated as a whole to form the upper part of the underwater foundation. It is generally used for large bridges in areas with high seismic risks, such as the main piers of cable-stayed bridges or suspension bridges.

[0003] At present, most independent circular caissons at sea are installed with the assistance of crane ships and positioning barges. After the caisson is initially positioned, it starts to be filled with water and sink, so that the crane ship gradually increases the load. When the load reaches the required range, the main hook is slowly loosened under the guidance of the measurement system to lower the caisson. As the caisson continues to sink, the increase in the displacement volume is basically balanced with the increase in the water volume in the box, and the load of the crane ship remains within the required range. When approaching the bed, stop filling the box with water, and reduce the load of the crane ship until the caisson is completely planted, and the installation accuracy is guaranteed to be within the quality standard range. Although the method of installing caissons with the assistance of crane ships can improve the installation efficiency and stability of caissons to a certain extent, it has high requirements for operating technology, may be affected by weather and sea conditions, and has relatively high costs.

[0004] As for the caisson pier structure used in deep-water bridge construction, the scale of the caisson reaches tens of thousands of tons or even more than 100,000 tons. The draft and water-blocking area of ​​the caisson are very large. At the same time, the sea conditions are complex, resulting in large water flow forces and horizontal loads of wind and waves, making positioning and control difficult. At the same time, the caisson piers are circular, and they are easy to rotate when being positioned by tugboats on site, which increases the difficulty of control. The traditional independent pier circular caisson construction method is difficult to meet the construction requirements of the caisson posture and position control. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method for installing super-large circular caisson piers with the assistance of double floats in order to solve the technical problem that the above-mentioned prior art methods are difficult to meet in the construction of deep-water bridge caisson piers.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A construction method for installing a super-large circular caisson bridge pier with double floating bodies is characterized in that two concave floating bodies for auxiliary installation are arranged axially symmetrically on both sides of the central axis of the lower tower column of the caisson bridge pier, and a locking device, a positioning device, a clamping device and a lifting device are fixedly arranged on the double floating bodies. The construction method specifically includes the following steps:

[0008] S1: Double floating body outfitting: The caisson pier is equipped with a longitudinal and transverse adjustment system at the prefabrication yard. The double floating bodies are put in place through a locking device combination. The upper clamping device of the floating body is clamped with the lower tower column of the caisson pier, and the lifting device is connected with the embedded parts of the main lifting point on the caisson.

[0009] S2: Rough positioning of caisson piers: The tugboat tows the caisson piers to the installation position, and then tows them along the two sides of the double buoys. The positioning devices on the double buoys are connected to the anchoring systems on both sides. The positioning devices are started, and the tugboat assists in braking to control the initial position of the caisson piers.

[0010] S3: Conversion of longitudinal and transverse adjustment system: The longitudinal and transverse adjustment system on the caisson pier is connected and locked with the anchoring systems on both sides, and the clamping device between the double buoys and the caisson pier is released to complete the conversion of the longitudinal and transverse adjustment system;

[0011] S4: Loading of the double-floating lifting device: The double-floating lifting device is loaded by injecting water into the caisson pier compartment and the load is controlled within the capacity of the lifting device;

[0012] S5: Lowering the caisson piers: Slowly loosen the floating lifting device to ensure that the increase in the drainage volume is balanced with the increase in the water filling volume in the caisson;

[0013] S6: Precise positioning of caisson bridge piers: When the caisson bridge piers are 50 cm away from the foundation bed, stop the pressure injection of the caisson bridge piers, use the longitudinal and transverse adjustment system on the caisson bridge piers to control the plane position, and use the double floating lifting device to control the elevation deviation around the caisson bridge piers;

[0014] S7: Caisson pier landing: completely lowered using the double-floating lifting device until the caisson pier is landed;

[0015] S8: Acceptance and re-adjustment of caisson bridge piers: After the caisson bridge piers are placed, the plane position is re-measured. If it does not meet the quality standard requirements, the floating body lifting device is controlled to float the caisson bridge piers, and steps S6 and S7 are repeated to adjust and install until it meets the quality requirements;

[0016] S9: Separation of double buoys: Release all cables on the double buoys and caisson piers, release the locking devices of the double buoys, separate the double buoys, recover the corresponding equipment, and complete the installation.

[0017] In step S1, the longitudinal and transverse adjustment system is composed of an electric winch and a cable guide roller, including a longitudinal adjustment system and a transverse adjustment system. After the electric winch rope passes through the cable guide roller, it is connected to the anchoring system arranged in advance on both sides. The angle between the longitudinal adjustment system and the connecting rope of the anchoring relative to the longitudinal axis of the bridge is within the range of 15-45°, and the angle between the connecting rope of the transverse adjustment system and the anchoring relative to the longitudinal axis of the bridge is within the range of 60-90°. The main lifting point embedded parts are embedded in the inclined top plate of the caisson structure, and are kept vertical with the connecting rope of the pulley block hanger of the floating body lifting device. The centroid of the rectangle formed by the positions of the four main lifting point embedded parts as vertices coincides with the plumb line of the center of gravity of the caisson pier.

[0018] In the steps S2 and S3, the anchoring system is arranged along the longitudinal direction of the bridge within a range of 20 to 30 m outward on both sides of the caisson piers, with a longitudinal spacing of 70 to 80 m, to ensure that the angle between the anchoring system and the connecting rope of the positioning device on the double floating body relative to the longitudinal axis of the bridge is within a range of 30 to 60 degrees, the angle between the anchoring system and the connecting rope of the longitudinal adjustment system on the caisson pier relative to the longitudinal axis of the bridge is within a range of 15 to 45 degrees, and the angle between the anchoring system and the connecting rope of the transverse adjustment system on the caisson pier relative to the longitudinal axis of the bridge is within a range of 60 to 90 degrees.

[0019] In step S4, the water injection rate ensures that the sinking speed of the caisson pier is no more than 0.1 m / min.

[0020] In step S6, the plane position axis deviation is controlled to be ±50 mm, and the elevation deviation around the caisson pier is controlled to be ±50 mm.

[0021] In step S8, after the caisson pier is planted, if it does not meet the installation quality standard, the floating body lifting device can be controlled to make the caisson pier float 50cm with a height deviation of ±100mm, and then readjust the installation.

[0022] The construction method is applicable to super-large circular caisson bridge piers, which refer to piers whose expanded foundation is a caisson structure with a diameter of 90m or more, a conical frame in which the diameter of the lower tower column gradually transitions from the bottom to the upper end, and the lower tower column and the caisson structure are prefabricated in an integrated manner.

[0023] A double-floating auxiliary installation structure adopted in the above-mentioned construction method is characterized in that it includes two concave floating bodies, the openings of the floating bodies are opposite to each other and are arranged axially symmetrically on both sides of the lower tower column of the super-large circular caisson bridge pier, and a locking device, a positioning device, a clamping device and a lifting device are fixedly connected to the floating bodies; the locking device is located at the connection between the two floating bodies and is used for the combination and separation of the two floating bodies; the positioning device is located at the corner of the floating body and is connected to the anchoring system pre-arranged around the floating body through a cable; the clamping device is located at the opening of the floating body, and its inner surface is in contact with the surface of the lower tower column; the lifting device is located between the positioning device and the clamping device, and is connected to the main lifting point embedded parts preset on the caisson foundation of the super-large circular caisson bridge pier through a cable.

[0024] The main body material of the floating body is steel.

[0025] The positioning device comprises a positioning electric winch and a cable guide roller. After the rope from the positioning electric winch passes through the cable guide roller, it is connected to an anchoring system arranged in advance around the floating body.

[0026] The clamping device includes a clamping frame, a hydraulic clamping ring, a mooring point, a flexible mooring cable, and a hand chain hoist. The clamping frame is processed and arranged according to the gap between the floating body and the lower tower column, and is fixed at the opening of the floating body. A hydraulic clamping ring is arranged on the clamping frame, which is controlled to move by a hydraulic system, and the inner surface is in contact with the surface of the lower tower column. The mooring point on the clamping frame is connected to the embedded part of the lower tower column through a flexible mooring cable, and is tightened and fixed by a hand chain hoist.

[0027] The lifting device includes a pulley block hanger and a hydraulic winch. The rope from the hydraulic winch passes through the pulley block hanger and is connected to the main lifting point embedded parts preset on the caisson foundation of the super-large circular caisson pier. After the double floating bodies are assembled, the centroid of the rectangle formed with the positions of the four pulley block hangers as vertices coincides with the plumb line of the center of gravity of the caisson pier, which is used to control the vertical displacement of the caisson pier.

[0028] By adopting the construction method of the present invention, the tugboat can be towed along the two sides of the double floating bodies, solving the problem of the tugboat rotating along the circular caisson; the longitudinal and transverse adjustment system can be converted to solve the problem of large horizontal force on the caisson pier; the caisson pier can be precisely positioned, and the elevation deviation around the caisson pier can be completely controlled by the double floating lifting device; if it does not meet the installation quality standard, the floating lifting device can be controlled to float the caisson pier and readjust the installation. Overall, by adopting the construction method of the present invention, the caisson pier has good installation stability and convenient and safe construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a top view of the construction effect of the super-large circular caisson bridge pier installed with the assistance of double floating bodies according to the present invention.

[0030] Figure 2 It is a left view of the construction effect of the super-large circular caisson bridge pier assisted by the double floating bodies of the present invention.

[0031] Figure 3 It is a top view of the construction effect of the double-floating body assisted installation of the super-large circular caisson bridge pier of the present invention under an ideal state.

[0032] Figure 4 It is a schematic diagram of the large-scale clamping device between the double floating bodies and the super-large circular caisson bridge pier of the present invention.

[0033] Figure 5 It is a flow chart of the construction method of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Example 1

[0035] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, a construction method for installing a super-large circular caisson bridge pier with the assistance of a double floating body comprises the following steps:

[0036] S1: Outfitting of the twin pontoons 1. The caisson pier 6 is equipped with the longitudinal and transverse adjustment system 7 at the prefabrication site. The twin pontoons 1 are put in place by the locking device 2. The holding device 4 on the pontoons is held tightly with the lower tower column of the caisson pier 6. The lifting device 5 is connected with the embedded parts 8 of the main lifting points on the caisson.

[0037] S2: Rough positioning of the caisson bridge pier 6. The tugboat tows the caisson bridge pier to the installation position, and then tows it along the two sides of the double buoys 1, connects the positioning device 3 on the double buoys with the anchoring systems 9 on both sides, starts the positioning device 3, and uses the tugboat to assist in braking to control the initial position of the caisson bridge pier 6;

[0038] S3: Conversion of the longitudinal and transverse adjustment system. The longitudinal and transverse adjustment system 7 on the caisson pier is connected and locked with the anchoring systems 9 on both sides, and the clamping device 4 between the double floating body 1 and the caisson pier 6 is released to complete the conversion of the longitudinal and transverse adjustment system;

[0039] S4: Loading of the double-floating lifting device 5. The double-floating lifting device 5 is loaded by injecting water into the compartment of the caisson pier 6, and the load is controlled within the capacity of the lifting device;

[0040] S5: lowering the caisson pier 6. Slowly loosening the floating body lifting device 5 to ensure that the increase in the drainage volume is balanced with the increase in the water filling volume in the caisson;

[0041] S6: Precise positioning of caisson bridge pier 6. When caisson bridge pier 6 is 50 cm away from the foundation, stop water injection of caisson bridge pier, use the longitudinal and transverse adjustment system 7 on the caisson bridge pier to control the plane position, and use the double floating lifting device 5 to control the elevation deviation around caisson bridge pier 6;

[0042] S7: The caisson pier 6 is placed on the bed. The double-floating lifting device 5 is fully used to lower the caisson pier 6 until it is placed on the bed;

[0043] S8: Acceptance and re-adjustment of caisson bridge pier 6. After the caisson bridge pier 6 is placed, the plane position is re-measured. If it does not meet the quality standard requirements, the floating body lifting device 5 is controlled to float the caisson bridge pier 6 by 50 cm, and steps S6 and S7 are repeated to adjust the installation until it meets the quality requirements;

[0044] S9: Separation of the double buoys. Release all cables between the double buoys 1 and the caisson pier 6, release the locking device 2 of the double buoys 1, separate the double buoys, recover the corresponding equipment, and complete the installation.

[0045] In step S1, the longitudinal and transverse adjustment system is composed of an electric winch and a cable guide roller. After the electric winch rope passes through the cable guide roller, it is connected to the anchoring system arranged in advance on both sides. The angle between the longitudinal adjustment system and the connecting rope of the anchoring relative to the longitudinal axis of the bridge is within the range of 15-45°, and the angle between the connecting rope of the transverse adjustment system and the anchoring relative to the longitudinal axis of the bridge is within the range of 60-90°. The main lifting point embedded parts are embedded in the inclined top plate of the caisson structure, and are kept vertical with the connecting rope of the pulley block hanger of the floating body lifting device. The centroid of the rectangle formed by the positions of the four main lifting point embedded parts as vertices coincides with the plumb line of the center of gravity of the caisson pier.

[0046] In the steps S2 and S3, the anchoring system is arranged along the longitudinal direction of the bridge within a range of 20 to 30 m outward on both sides of the caisson piers, with a longitudinal spacing of 70 to 80 m, to ensure that the angle between the anchoring system and the connecting rope of the positioning device on the double floating body relative to the longitudinal axis of the bridge is within a range of 30 to 60 degrees, the angle between the anchoring system and the connecting rope of the longitudinal adjustment system on the caisson pier relative to the longitudinal axis of the bridge is within a range of 15 to 45 degrees, and the angle between the anchoring system and the connecting rope of the transverse adjustment system on the caisson pier relative to the longitudinal axis of the bridge is within a range of 60 to 90 degrees.

[0047] In step S4, the water injection rate ensures that the sinking speed of the caisson pier is no more than 0.1 m / min.

[0048] In step S6, the plane position axis deviation is controlled to be ±50 mm, and the elevation deviation around the caisson pier is controlled to be ±50 mm.

[0049] In step S8, after the caisson pier is planted, if it does not meet the installation quality standard, the floating body lifting device can be controlled to make the caisson pier float 50cm with a height deviation of ±100mm, and then readjust the installation.

[0050] The construction method is applicable to super-large circular caisson bridge piers, which refer to piers whose expanded foundation is a caisson structure with a diameter of 90m or more, a conical frame in which the diameter of the lower tower column gradually transitions from the bottom to the upper end, and the lower tower column and the caisson structure are prefabricated in an integrated manner. Example 2

[0051] like Figure 1 , Figure 2 , Figure 4 As shown, a double-floating auxiliary installation structure used in Example 1 includes two concave floating bodies 1 arranged axially symmetrically, a locking device 2, a positioning device 3, a clamping device 4 and a lifting device 5 are fixedly arranged on the floating body 1, and a longitudinal and transverse adjustment system 7 and a mooring embedded part 8 are arranged in advance on the caisson pier 6, and an anchoring system 9 is arranged in advance on both sides of the caisson pier installation position. The clamping device 4 includes a clamping frame 4-1, a hydraulic clamping ring 4-2, a mooring point and a flexible mooring cable 4-3, and a hand winch 4-4.

[0052] The holding frame 4-1 is processed and arranged according to the gap between the floating body and the lower tower column, and is fixed at the opening of the floating body. A hydraulic holding ring 4-2 is arranged on the holding frame 4-1, which is controlled to move by the hydraulic system, and the inner surface is in contact with the surface of the lower tower column. The mooring point on the holding frame 4-1 is connected to the embedded part of the lower tower column through a flexible mooring cable 4-3, and is tightened and fixed by a hand winch 4-4. The mooring points are arranged on the upper and lower sides of the holding frame 4-1. Example 3

[0053] like Figure 2 , Figure 3 , Figure 4 As shown, in an ideal state, the sea conditions in the construction waters are good. By selecting a suitable meteorological window, the wind is below level 5 (less than 8m / s), the wave height is less than 1m, the water flow velocity is less than 0.3m / s, and the water flow force and wind and wave horizontal load can be ignored. The construction method of a double buoy assisted installation of an extra-large circular caisson bridge pier in Example 1 can be simplified and includes the following steps:

[0054] S1': outfitting of the twin buoys 1. At the prefabrication site where the caisson pier 6 is connected, the twin buoys 1 are put in place by means of the locking device 2, the holding device 4 on the buoys is held tightly to the caisson pier 6, and the lifting device 5 is connected to the embedded parts 8 of the main lifting points on the caisson;

[0055] S2': Rough positioning of the caisson pier 6. The tugboat tows the caisson pier to the installation position, and then tows it along the two sides of the double buoys 1, connects the positioning device 3 on the double buoys with the anchoring systems 9 on both sides, starts the positioning device 3, and uses the tugboat to assist in braking to control the initial position of the caisson pier 6;

[0056] S3': Release the clamping device 4. Loosen the hand chain hoist 4-4 of the clamping device 4 between the double floating body 1 and the caisson bridge pier 6, release the connection between the flexible mooring cable 4-3 and the embedded part of the lower tower column, and control the movement of the hydraulic clamping ring 4-2 through the hydraulic system to make the gap between the inner surface of the hydraulic clamping ring 4-2 and the surface of the lower tower column of the caisson bridge pier 6 within the range of 3~5cm;

[0057] S4': Loading of the double-floating lifting device 5. The double-floating lifting device 5 is loaded by injecting water into the compartment of the caisson pier 6, and the load is controlled within the capacity of the lifting device;

[0058] S5': lower the caisson pier 6. Slowly release the floating body lifting device 5 to ensure that the increase in the drainage volume is balanced with the increase in the water filling volume in the caisson;

[0059] S6': Precise positioning of caisson bridge pier 6. When caisson bridge pier 6 is 50cm away from the foundation, stop water injection into the caisson bridge pier, use the double floating lifting device 5 to control the elevation deviation around the caisson bridge pier 6, and then control the movement of hydraulic holding ring 4-2 through the hydraulic system on the holding device 4, so that the inner surface of the hydraulic holding ring 4-2 is in close contact with the surface of the lower tower column of the caisson bridge pier 6, and use the positioning device 3 on the double floating body to control the plane position;

[0060] S7': The caisson bridge pier 6 is placed on the bed. The hydraulic system on the clamping device 4 controls the movement of the hydraulic holding ring 4-2, so that the gap between the inner surface of the hydraulic holding ring 4-2 and the surface of the lower tower column of the caisson bridge pier 6 is within the range of 1-3 cm, and the double floating lifting device 5 is fully utilized to lower the caisson bridge pier 6 until the bed is placed;

[0061] S8': Acceptance and re-adjustment of caisson bridge pier 6. After the caisson bridge pier 6 is placed, the plane position is re-measured. If it does not meet the quality standard requirements, the floating body lifting device 5 is controlled to float the caisson bridge pier 6 by 50cm, and steps S6' and S7' are repeated to adjust the installation until it meets the quality requirements;

[0062] S9': separation of the double buoys. Release all cables between the double buoys 1 and the caisson pier 6, release the locking device 2 of the double buoys 1, separate the double buoys, recover the corresponding equipment, and complete the installation.

[0063] In step S2', the anchoring system is arranged longitudinally of the bridge within 20-30m outwards from both sides of the caisson piers, with a longitudinal spacing of 200-250m, to ensure that the angle between the anchoring system and the connecting rope of the positioning device on the double buoys relative to the longitudinal axis of the bridge is within 30-60°.

[0064] In step S4', water is injected to ensure that the sinking speed of the caisson pier is no more than 0.1 m / min.

[0065] In the step S6', the plane position axis deviation is controlled to be ±50 mm, and the elevation deviation around the caisson pier is controlled to be ±50 mm.

[0066] In the step S8', after the caisson pier is planted, if it does not meet the installation quality standard, the floating body lifting device can be controlled to make the caisson pier float 50cm with a height deviation of ±100mm, and then readjust the installation.

[0067] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A construction method for installing a super-large circular caisson bridge pier with the aid of double floating bodies, characterized in that: Two auxiliary concave floating bodies are arranged axially symmetrically on both sides of the central axis of the lower tower column of the super-large circular caisson bridge pier, and a locking device, a positioning device, a holding device and a lifting device are fixedly arranged on the double floating bodies. The construction method specifically includes the following steps: S1: Double floating body outfitting: The caisson pier is equipped with a longitudinal and transverse adjustment system at the prefabrication yard. The double floating bodies are put in place through a locking device combination. The holding device on the floating body is held tightly with the lower tower column of the caisson pier, and the lifting device is connected with the embedded parts of the main lifting point on the caisson. S2: Rough positioning of caisson piers: The tugboat tows the caisson piers to the installation position, and then tows them along the two sides of the double buoys. The positioning devices on the double buoys are connected to the anchoring systems on both sides. The positioning devices are started, and the tugboat assists in braking to control the initial position of the caisson piers. S3: Conversion of longitudinal and transverse adjustment system: The longitudinal and transverse adjustment system on the caisson pier is connected and locked with the anchoring systems on both sides, and the clamping device between the double buoys and the caisson pier is released to complete the conversion of the longitudinal and transverse adjustment system; S4: Loading of the double-floating lifting device: The double-floating lifting device is loaded by injecting water into the caisson pier compartment and the load is controlled within the capacity of the lifting device; S5: Lowering the caisson piers: Slowly loosen the floating lifting device to ensure that the increase in the drainage volume is balanced with the increase in the water filling volume in the caisson; S6: Precise positioning of caisson bridge piers: When the caisson bridge piers are 50 cm away from the foundation bed, stop the pressure injection of the caisson bridge piers, use the longitudinal and transverse adjustment system on the caisson bridge piers to control the plane position, and use the double floating lifting device to control the elevation deviation around the caisson bridge piers; S7: Caisson pier landing: completely lowered using the double-floating lifting device until the caisson pier is landed; S8: Acceptance and re-adjustment of caisson bridge piers: After the caisson bridge piers are placed, the plane position is re-measured. If it does not meet the quality standard requirements, the floating body lifting device is controlled to float the caisson bridge piers, and steps S6 and S7 are repeated to adjust and install until it meets the quality requirements; S9: Separation of double buoys: Release all cables on the double buoys and caisson piers, release the locking devices of the double buoys, separate the double buoys, recover the corresponding equipment, and complete the installation.

2. The construction method for installing a super-large circular caisson bridge pier with double floating bodies as claimed in claim 1 is characterized by: In step S1, the longitudinal and transverse adjustment system is composed of an electric winch and a cable guide roller, and is divided into a longitudinal adjustment system and a transverse adjustment system. After the rope from the electric winch passes through the cable guide roller, it is connected to the anchoring systems arranged in advance on both sides. The connecting ropes of the longitudinal adjustment system and the anchoring system are at an angle of 15 to 45° relative to the longitudinal axis of the bridge, and the connecting ropes of the transverse adjustment system and the anchoring system are at an angle of 60 to 90° relative to the longitudinal axis of the bridge. The main hanging point embedded parts are buried in the inclined top plate of the caisson structure, and are kept vertical with the connecting rope of the pulley block hanger of the floating body lifting device. The centroid of the rectangle formed with the positions of the four main hanging point embedded parts as vertices coincides with the plumb line of the center of gravity of the caisson pier.

3. The construction method for installing a super-large circular caisson bridge pier with double floating bodies as claimed in claim 2 is characterized by: In the steps S2 and S3, the anchoring system is arranged along the longitudinal direction of the bridge within a range of 20 to 30 m outward on both sides of the caisson piers, with a longitudinal spacing of 70 to 80 m, to ensure that the angle between the anchoring system and the connecting rope of the positioning device on the double floating body relative to the longitudinal axis of the bridge is within a range of 30 to 60 degrees, the angle between the anchoring system and the connecting rope of the longitudinal adjustment system on the caisson pier relative to the longitudinal axis of the bridge is within a range of 15 to 45 degrees, and the angle between the anchoring system and the connecting rope of the transverse adjustment system on the caisson pier relative to the longitudinal axis of the bridge is within a range of 60 to 90 degrees.

4. The construction method for installing a super-large circular caisson bridge pier with double floating bodies as claimed in claim 1 is characterized by: In step S4, the water injection rate ensures that the sinking speed of the caisson pier is no more than 0.1 m / min.

5. The construction method for installing a super-large circular caisson bridge pier with double floating bodies as claimed in claim 1 is characterized by: In step S6, the plane position axis deviation is controlled to be ±50 mm, and the elevation deviation around the caisson pier is controlled to be ±50 mm.

6. The construction method for installing a super-large circular caisson bridge pier with double floating bodies as claimed in claim 1 is characterized by: In step S8, after the caisson pier is planted, if it does not meet the installation quality standard, the floating body lifting device can be controlled to make the caisson pier float 50cm with a height deviation of ±100mm, and then readjust the installation.

7. A construction method for installing a super-large circular caisson bridge pier with the aid of double floating bodies according to any one of claims 1 to 6, characterized in that: The construction method is applicable to super-large circular caisson bridge piers, which refer to piers whose expanded foundation is a caisson structure with a diameter of 90m or more, a conical frame in which the diameter of the lower tower column gradually transitions from the bottom to the upper end, and the lower tower column and the caisson structure are prefabricated in an integrated manner.

Images