Construction method of external expansion type cable-stayed bridge steel tower combining vertical rotation and horizontal rotation

Abstract

This invention belongs to the field of bridge engineering construction technology, and particularly relates to a construction method for steel towers of an outward-tensioned cable-stayed bridge that combines vertical rotation and horizontal rotation. The method includes the following steps: constructing the bridge substructure and main beam; installing a vertical rotation tower and a vertical rotation hinge on the top surface of the box girder, with the two towers symmetrically arranged along the longitudinal centerline of the bridge and horizontally connected at the top; erecting a scaffold for assembling the upper tower column on the top surface of the box girder along the longitudinal direction, so that the subsequent vertical rotation of the upper tower column takes place on the top surface of the box girder, and the vertical rotation plane coincides with the centerline of the longitudinal direction of the bridge; assembling the upper tower column and upper crossbeam on the scaffold; installing traction cables and back cables; vertically rotating the upper tower column; welding and closing the upper crossbeam; installing a horizontal rotation device on the top surface of the box girder, which allows for the horizontal rotation of the upper tower column; closing the tower column; installing permanent cables; and constructing the bridge deck system and ancillary facilities. The beneficial effect of this invention is that it allows for the construction of outward-tensioned cable-stayed bridge steel tower structures without affecting the safe operation of existing railways.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering construction technology, and in particular relates to a construction method for steel towers of outward-extended cable-stayed bridges that combines vertical rotation and horizontal rotation. Background Technology

[0002] In urban infrastructure construction, it is common to encounter situations where new bridges are built near existing railways. When a new bridge is parallel to and very close to an existing railway, the construction of bridge structures with tall towers, such as cable-stayed bridges or suspension bridges, especially outward-growing tower structures, has a significant impact on the safe operation of the existing railway. As outward-growing towers extend outward with increasing height, their distance from the existing railway also decreases. If methods such as erecting formwork for segmental hoisting or assembling the entire structure horizontally and then rotating it vertically in one go are used to construct the tower, the formwork or horizontal assembly frame may encroach upon the existing railway's boundary, seriously endangering its operation. If the conventional one-time rotation method is used, a large-volume foundation with a rotating hinge seat within it is required. After rotation, the rotating hinge seat cannot be recycled, resulting in poor economic efficiency. Therefore, there is an urgent need for a construction method that is both economical and does not affect the safe operation of the existing railway to solve this technical problem. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a construction method for the steel tower of an outward-facing cable-stayed bridge that combines vertical rotation and horizontal rotation, which can construct the steel tower structure of an outward-facing cable-stayed bridge without affecting the safe operation of the existing railway.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A construction method for an outward-facing cable-stayed bridge steel tower that combines vertical and horizontal rotation includes the following construction steps:

[0006] S1. Construction of the bridge substructure: Construction of bridge pile foundations, abutments, side piers, lower tower columns, and lower crossbeams, and construction of steel-concrete composite tower columns on the top of the lower tower columns;

[0007] S2. Construction of the main bridge beam: Erect a support platform and cast or assemble the box girder on the support platform;

[0008] S3. Installation of vertical rotation device: Install the vertical rotation tower and vertical rotation hinge on the top surface of the completed box girder; the two towers of the vertical rotation tower are symmetrically arranged along the longitudinal bridge centerline, and the top horizontal bracing of the vertical rotation tower is arranged along the transverse bridge direction.

[0009] S4. Assembling the upper tower column: Erect an assembly frame for the upper tower column along the longitudinal direction of the bridge on the top surface of the box girder and on both sides of the vertical tower, so that the vertical rotation of the upper tower column is carried out on the top surface of the box girder and the vertical rotation plane coincides with the centerline of the longitudinal direction of the bridge; Assemble the upper tower column and the upper crossbeam located on the upper tower column on the assembly frame.

[0010] S5. Installation of traction cable and traction cylinder: Install and fix the traction cylinder on the vertical tower, and install the traction cable between the upper tower column and the traction cylinder;

[0011] S6. Start the vertical rotation of the upper tower column: Start the traction cylinder to simultaneously pull the upper tower columns on both sides away from the jig. Stop the traction after there is enough operating space, and lock the traction cable to fix the position of the upper tower column; install the back cable cylinder on the top surface of the box girder, and install the back cable between the upper tower column and the back cable cylinder, while removing the jig at the same time.

[0012] S7. Upper tower column vertical rotation into position: Restart the traction cylinder to continue vertical rotation, and at the same time start the back cable cylinder to control the vertical rotation speed and correction. After the upper tower column is vertically rotated to a vertical state and the upper crossbeam is aligned, temporarily fix the upper tower column to the vertical rotation hinge, and at the same time lock the traction cable and back cable.

[0013] S8. Upper crossbeam welding closure: Weld the upper crossbeam interface to form a complete upper tower column and upper crossbeam structure, and remove the traction cable, traction cylinder and vertical rotation tower;

[0014] S9. Installation of the horizontal rotation device: Install the horizontal rotation device on the top surface of the box girder. The horizontal rotation device is fixedly connected to the upper tower columns on the left and right sides. The upper tower columns can be horizontally rotated by rotating the horizontal rotation device. Install wind cables between the horizontal rotation device and the upper tower columns. After the horizontal rotation device is installed, release the temporary connection between the upper tower column and the vertical rotation hinge, and remove the vertical rotation hinge, back cable and back cable cylinder.

[0015] S10. Upper Tower Column Rotation and Positioning: Start the rotation device to begin rotating the upper tower column. Control the rotation speed and stability of the upper tower column during the rotation process until it has rotated 90° and reached the designed position.

[0016] S11. Tower column closure: The tower column of the closure section is hoisted into place and welded and fixed on the top surface of the box girder using lifting equipment to complete the tower column closure. After the tower column construction is completed, the horizontal rotation device is removed.

[0017] S12. Permanent cable installation: Install permanent cables, tension them to the design tension force according to the design requirements, and then anchor them.

[0018] S13. Construction of bridge deck system and ancillary facilities: Construction of bridge deck paving, installation of expansion joints and guardrail ancillary facilities, dismantling of support platforms, and completion of bridge construction.

[0019] Preferably, in step S4, the upper tower column is divided into two symmetrical left and right parts from the center line of the upper crossbeam, and the two parts of the upper tower column are rotated simultaneously during vertical rotation.

[0020] Preferably, in step S4, the upper tower column is located near the outer edge of the bridge deck, and the upper tower column structure gradually expands outward from bottom to top; the distance between the towers on the left and right sides of the vertical rotating tower is greater than the width of the upper tower column assembly frame and less than the width of the box girder bridge deck, and the distance from the top of the vertical rotating tower to the top surface of the box girder is greater than the height of the upper tower column.

[0021] More preferably, the vertical rotating tower is a portal frame structure.

[0022] Preferably, in step S7, the vertical hinge is set on the box girder, with one end fixed to the box girder and the other end fixed to the outer side of the bottom of the upper tower column.

[0023] More preferably, the dimensions of the vertical hinge are the same as the dimensions of the bottom surface of the upper tower column, and the top elevation of the vertical hinge is consistent with the design elevation of the bottom surface of the upper tower column.

[0024] Preferably, in step S5, the traction cable is positioned between the inner side of the upper tower column and the traction cylinder, and the traction cylinder is fixed on the vertical rotating tower and connected to the traction cable.

[0025] More preferably, at least two sets of traction cables are provided on each of the upper tower columns on the left and right sides, and each set of traction cables is symmetrically arranged along the vertical rotation plane; each traction cable is equipped with a traction cylinder.

[0026] Preferably, in step S6, the backing cable is positioned between the outer side of the upper tower column and the backing cable cylinder, and the backing cable cylinder is fixed to the top surface of the box girder and connected to the backing cable.

[0027] More preferably, at least two sets of back cables are provided on each of the upper tower columns on the left and right sides, and each set of back cables is symmetrically arranged along the vertical rotation plane; each back cable is equipped with a back cable hydraulic cylinder.

[0028] More preferably, in step S6, the number of traction cables and back cables are equal and their positions are aligned.

[0029] Preferably, in step S9, the horizontal rotation device includes a horizontal rotation hinge and a slide rail installed on the top surface of the box girder, and a cross beam installed and fixed between the upper tower columns on the left and right sides. The horizontal rotation hinge is located at the center of the bridge tower and is set between the top surface of the box girder and the cross beam. The cross beam is set above the horizontal rotation hinge. Four orthogonally arranged sliding shoes are provided at the bottom of the cross beam. The slide rail is set between the top surface of the box girder and the sliding shoes.

[0030] More preferably, the slide is an annular slide concentric with the flat hinge, the diameter of the annular slide is larger than the diameter of the flat hinge and slightly smaller than the width of the box girder, and a polytetrafluoroethylene plate is provided between the top of the slide and the slide shoe.

[0031] More preferably, in step S9, the wind cables are arranged between the upper tower column and the cross beam, and the number of wind cables is not less than 4, and they are arranged symmetrically in the front, back, left and right.

[0032] More preferably, in step S9, the installation process of the horizontal rotation device is as follows: the horizontal rotation hinge and the slide are installed sequentially on the top surface of the box girder, a polytetrafluoroethylene plate is set above the slide, a cross beam with a sliding shoe is installed and fixed between the upper tower columns, and finally the wind cable is installed between the cross beam and the upper tower columns.

[0033] The beneficial effects of this invention are as follows: The construction method for externally oriented cable-stayed bridge steel towers that combines vertical and horizontal rotation provides a method that fully leverages the advantages of both methods. This ensures that the entire construction process of the cable-stayed bridge or suspension bridge, especially the tower structure, remains within the bridge deck area, minimizing the impact of tower construction on the surrounding environment and ensuring the safe operation of existing railways. Furthermore, all temporary facilities used during tower construction can be recycled, avoiding resource waste. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the elevation of the tower column before vertical rotation in the construction method of this invention;

[0035] Figure 2 This is a schematic diagram of the cross-section of the tower column before vertical rotation in the construction method of this invention;

[0036] Figure 3 This is a schematic elevation view of the tower column during the vertical rotation process in the construction method of this invention;

[0037] Figure 4 This is a cross-sectional schematic diagram of the tower column during the vertical rotation process in the construction method of this invention;

[0038] Figure 5 This is a schematic diagram of the elevation of the tower column after it has been vertically rotated and positioned according to the construction method of this invention;

[0039] Figure 6 This is a schematic diagram of the cross-section of the tower column after it has been vertically rotated and positioned according to the construction method of this invention;

[0040] Figure 7 This is a schematic diagram of the elevation of the tower column before horizontal rotation in the construction method of this invention;

[0041] Figure 8 This is a schematic diagram of the cross section of the tower column before horizontal rotation in the construction method of this invention;

[0042] Figure 9 This is a schematic diagram of the elevation of the tower column after it has been horizontally rotated and positioned according to the construction method of this invention;

[0043] Figure 10 This is a schematic diagram of the cross section of the tower column after it has been rotated and positioned according to the construction method of this invention;

[0044] Figure 11 This is a schematic elevation view of a cable-stayed bridge constructed using the construction method of this invention after completion.

[0045] Figure 12 This is a schematic diagram of the cross-section of a cable-stayed bridge after construction using the construction method of this invention.

[0046] Figure 13 This is a plan view of the tower column horizontal rotation device in the construction method of the present invention.

[0047] In the diagram: 11. Pile foundation; 12. Pier cap; 13. Side pier column; 14. Lower tower column; 15. Steel-concrete composite section tower column; 16. Upper tower column; 17. Closure section tower column; 18. Lower crossbeam; 19. Upper crossbeam; 20. Box girder; 21. Permanent cable; 22. Support platform; 23. Vertical rotating tower; 24. Vertical rotating hinge; 25. Frame; 26. Traction cable; 27. Traction cylinder; 28. Backing cable; 29. ​​Backing cable cylinder; 30. Horizontal rotating hinge; 31. Cross beam; 32. Slipper; 33. Slipway; 34. PTFE sheet; 35. Wind cable; 36. Existing railway. Detailed Implementation

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0050] This invention provides a construction method for an externally oriented cable-stayed bridge steel tower that combines vertical and horizontal rotation, as shown in the attached figure. Figure 1 ~Attached Figure 13 The construction process includes the following steps:

[0051] S1. Construction of the bridge substructure. Construction of bridge pile foundation 11, abutment 12, side pier column 13, lower tower column 14, lower crossbeam 18, and construction of steel-concrete composite section tower column 15 on top of lower tower column 14.

[0052] S2. Construction of the main bridge beam. Erect a support platform 22, and cast or assemble the box girder 20 on the support platform 22.

[0053] S3. Vertical rotation device installation

[0054] A vertical rotating tower 23 and a vertical rotating hinge 24 are installed on the top surface of the completed box girder 20. Details are as follows:

[0055] The vertical rotating tower 23 is a portal frame structure set on the box girder 20, including towers symmetrically arranged on the left and right sides and a top horizontal bracing. The two towers of the vertical rotating tower 23 are symmetrically arranged along the longitudinal centerline of the bridge, and the top horizontal bracing of the vertical rotating tower 23 is arranged along the transverse direction of the bridge. It is required that the distance between the towers on the left and right sides is greater than the width of the upper tower column 16 sets of splicing frame 25 and less than the width of the bridge deck of the box girder 20, and the distance from the top horizontal bracing to the top surface of the box girder 20 is greater than the height of the upper tower column 16.

[0056] The vertical hinge 24 is set on the box girder 20, with one end fixed to the box girder 20 and the other end fixed to the bottom outer side of the upper tower column 16. The dimensions of the vertical hinge 24 are the same as the bottom dimensions of the upper tower column 16, and the top elevation of the vertical hinge 24 is consistent with the design elevation of the bottom surface of the upper tower column 16.

[0057] S4. Assembly of the upper tower column 16. An assembly frame 25 for the upper tower column 16 is erected on the top surface of the box girder 20 and on both sides of the vertical tower 23 along the longitudinal direction of the bridge, so that the vertical rotation of the upper tower column 16 is carried out on the top surface of the box girder 20 and the vertical rotation plane coincides with the centerline of the longitudinal direction of the bridge; and the upper tower column 16 and the upper crossbeam 19 are assembled on the frame 25.

[0058] The upper tower column 16 is divided into two symmetrical left and right parts from the center line of the upper crossbeam 19. The upper crossbeam 19 is located on the upper part of the upper tower column 16, and the upper tower column 16 is located near the outer edge of the bridge deck. The structure of the upper tower column 16 gradually expands outward from the bottom to the top of the bridge.

[0059] S5. Installation of traction cable 26 and traction cylinder 27

[0060] A fixed traction cylinder 27 is installed on the vertical rotation tower 23, and a traction cable 26 is installed between the traction cylinder 27 and the inner side of the upper tower column 16. At least two sets of traction cables 26 are set on each of the left and right upper tower columns 16, and each set of traction cables 26 is symmetrically arranged along the vertical rotation plane. The traction cylinder is connected to the traction cable 26, and one traction cylinder 27 is set for each traction cable 26.

[0061] The above steps S1-S5 can be referred to the appendix. Figure 1 Appendix Figure 2 The structure.

[0062] S6. Start the vertical rotation of the upper tower column 16, and install the backing cable and backing cable cylinder.

[0063] Reference Figure 3 , Figure 4During vertical rotation, both parts of the upper tower column 16 are rotated simultaneously, and the vertical rotation of the upper tower column 16 takes place on the top surface of the box girder 20, with the rotation plane coinciding with the centerline of the bridge's travel direction. The specific operation is as follows: The traction cylinder 27 is activated to simultaneously pull the upper tower columns 16 on both sides away from the support frame 25. Once operating space is available, traction is stopped, and the traction cable 26 is locked to fix the position of the upper tower column 16. A back cable cylinder 29 is installed on the top surface of the box girder 20, and a back cable 28 is installed between the upper tower column 16 and the back cable cylinder 29. Simultaneously, the support frame 25 is removed.

[0064] The aforementioned backstay cables and backstay cylinders are configured as follows: the backstay cable 28 is positioned between the outer side of the upper tower column 16 and the backstay cylinder 29. The backstay cylinder 29 is fixed to the top surface of the box girder 20 and connected to the backstay cable 28. At least two sets of backstay cables 28 are installed on each of the left and right upper tower columns 16. Each set of backstay cables 28 is symmetrically arranged along the vertical rotation plane, and each backstay cable 28 is equipped with one backstay cylinder 29. The number of backstay cables 28 and the traction cables 26 are equal, and their positions are aligned.

[0065] S7. The upper tower column 16 is vertically rotated into position. The traction cylinder 27 is restarted to continue the vertical rotation, while the back cable cylinder 29 is activated to control the rotation speed and correct deviation. Once the upper tower column 16 is vertically rotated and the upper crossbeam 19 is aligned, the upper tower column 16 is temporarily fixed to the vertical hinge 24, and the traction cable 26 and back cable 28 are locked simultaneously. See the schematic diagram after the upper tower column is vertically rotated into position. Figure 5 , Figure 6 .

[0066] S8. The upper crossbeam 19 is welded together. The joint of the upper crossbeam 19 is welded to form a complete structure of the upper tower column 16 and the upper crossbeam 19. The traction cable 26, traction cylinder 27 and vertical rotating tower 23 are then removed.

[0067] S9. Installation of the horizontal rotation device

[0068] A plan view of the upper tower column horizontal rotation device of the present invention is shown below. Figure 13 As shown. The horizontal rotation device includes a horizontal rotation hinge 30 and a slide rail 33 respectively installed on the top surface of the box girder 20, and a cross beam 31 installed between the upper tower columns 16. The horizontal rotation hinge 30 is located between the top surface of the box girder 20 and the cross beam 31, at the exact center of the bridge tower. The cross beam 31 is installed above the horizontal rotation hinge 30 and is connected and fixed to the upper tower column 16. Four orthogonally arranged sliding shoes 32 are provided at the bottom of the cross beam 31. The slide rail 33 is located between the top surface of the box girder 20 and the sliding shoes 32. The cross beam 31 can slide on the slide rail 33 through the sliding shoes 32, thereby driving the upper tower columns 16 on both sides to rotate.

[0069] In this invention, the slide 33 is an annular slide 33 concentric with the horizontal pivot 30. The diameter of the annular slide 33 is larger than the diameter of the horizontal pivot 30 and slightly smaller than the width of the box girder 20. A polytetrafluoroethylene plate 34 is provided between the top of the slide 33 and the sliding shoe 32, which can effectively reduce the friction during horizontal rotation.

[0070] During installation, the horizontal pivot hinge 30 and the slide rail 33 are installed sequentially on the top surface of the box girder 20. A polytetrafluoroethylene plate 34 is placed above the slide rail 33. A fixed cross beam 31 is installed between the upper tower columns 16. The cross beam 31 can slide on the slide rail 33 through the sliding shoe 32. Finally, wind cables 35 are installed between the cross beam 31 and the upper tower column 16. The wind cables 35 are arranged between the upper tower column 16 and the cross beam 31, with no fewer than four cables, symmetrically arranged front, back, left, and right. After the horizontal pivot device is installed, the temporary fastening between the upper tower column 16 and the vertical pivot hinge 24 is released, and the vertical pivot hinge 24, the back cable 28, and the back cable cylinder 29 are removed.

[0071] A schematic diagram of the upper tower column 16 before horizontal rotation after the horizontal rotation device is installed is shown below. Figure 7 and Figure 8 As shown.

[0072] S10. Position the upper tower column 16 by horizontal rotation. Start the jacks to rotate the horizontal rotation device, beginning the horizontal rotation of the upper tower column 16. Control the rotation speed and stability of the upper tower column 16 during the rotation process until it has rotated 90° to the designed position. Figure 9 and Figure 10 As shown.

[0073] S11. Tower column closure. Using lifting equipment, the closure section tower column 17 was hoisted into place on the top surface of box girder 20 and welded in place to complete the tower column closure. After the tower column construction was completed, the horizontal rotation device was removed.

[0074] S12. Installation of permanent cable 21. Install permanent cable 21, tension it to the design tension force according to the design requirements, and then anchor it.

[0075] S13. Bridge Deck and Ancillary Facilities Construction. This involves constructing the bridge deck pavement, installing expansion joints and guardrail ancillary facilities, dismantling support platform 22, and completing the bridge construction. A schematic diagram of the completed cable-stayed bridge is shown below. Figure 11 and Figure 12 As shown.

[0076] In the above construction method, the lower tower column 14 and the lower crossbeam 18 are concrete structures, while the upper tower column 16, the closure section tower column 17, and the upper crossbeam 19 are steel structures.

[0077] The foregoing detailed examples of the present invention are merely preferred embodiments and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A construction method for an outward-extended cable-stayed bridge steel tower combining vertical and horizontal rotation, characterized in that, The construction steps include the following: S1. Construction of the bridge substructure: Construction of bridge pile foundations, abutments, side piers, lower tower columns, and lower crossbeams, and construction of steel-concrete composite tower columns on the top of the lower tower columns; S2. Construction of the main bridge beam: Erect a support platform and cast or assemble the box girder on the support platform; S3. Installation of vertical rotation device: Install the vertical rotation tower and vertical rotation hinge on the top surface of the completed box girder; The two towers of the vertical rotating tower are symmetrically arranged along the longitudinal bridge centerline, and the top horizontal bracing of the vertical rotating tower is arranged along the transverse bridge direction. S4. Assembling the upper tower column: Erect an assembly form for the upper tower column along the longitudinal direction of the bridge on the top surface of the box girder and on both sides of the vertical tower, so that the vertical rotation of the upper tower column is carried out on the top surface of the box girder and the vertical rotation plane coincides with the centerline of the longitudinal direction of the bridge; Assemble the upper tower column and the upper crossbeam located on the upper tower column on the assembly form. S5. Installation of traction cable and traction cylinder: Install and fix the traction cylinder on the vertical tower, and install the traction cable between the upper tower column and the traction cylinder; S6. Start the vertical rotation of the upper tower column: Start the traction cylinder to simultaneously pull the upper tower columns on both sides away from the jig. Stop the traction after there is enough operating space, and lock the traction cable to fix the position of the upper tower column. Install the back cable cylinder on the top surface of the box girder, and install the back cable between the upper tower column and the back cable cylinder. At the same time, remove the jig. S7. Upper tower column vertical rotation into position: Restart the traction cylinder to continue vertical rotation, and at the same time start the back cable cylinder to control the vertical rotation speed and correction. After the upper tower column is vertically rotated to a vertical state and the upper crossbeam is aligned, temporarily fix the upper tower column to the vertical rotation hinge, and at the same time lock the traction cable and back cable. S8. Upper crossbeam welding closure: Weld the upper crossbeam interface to form a complete upper tower column and upper crossbeam structure, and remove the traction cable, traction cylinder and vertical rotation tower; S9. Installation of the horizontal rotation device: Install the horizontal rotation device on the top surface of the box girder. The horizontal rotation device is fixedly connected to the upper tower columns on the left and right sides. The upper tower columns can be horizontally rotated by rotating the horizontal rotation device. Install wind cables between the horizontal rotation device and the upper tower columns. After the horizontal rotation device is installed, release the temporary connection between the upper tower column and the vertical rotation hinge, and remove the vertical rotation hinge, back cable and back cable cylinder. S10. Upper Tower Column Rotation and Positioning: Start the rotation device to begin rotating the upper tower column. Control the rotation speed and stability of the upper tower column during the rotation process until it has rotated 90° and reached the designed position. S11. Tower column closure: The tower column of the closure section is hoisted into place and welded and fixed on the top surface of the box girder using lifting equipment to complete the tower column closure. After the tower column construction is completed, the horizontal rotation device is removed. S12. Permanent cable installation: Install permanent cables, tension them to the design tension force according to the design requirements, and then anchor them. S13. Construction of bridge deck system and ancillary facilities: Construction of bridge deck paving, installation of expansion joints and guardrail ancillary facilities, dismantling of support platforms, and completion of bridge construction.

2. The construction method of the external tension type cable-stayed bridge steel tower combined with the vertical rotation and the horizontal rotation according to claim 1, characterized in that, In step S4, the upper tower column is located near the outer edge of the bridge deck, and the upper tower column structure gradually expands outward from bottom to top; the distance between the towers on the left and right sides of the vertical rotating tower is greater than the width of the upper tower column assembly frame and less than the width of the box girder bridge deck, and the distance from the top of the vertical rotating tower to the top surface of the box girder is greater than the height of the upper tower column.

3. The construction method of the steel tower of the outer opening type cable-stayed bridge combined with the vertical rotation and the horizontal rotation according to claim 2, characterized in that, The vertical rotating tower is a portal frame structure.

4. The construction method of the external tension type cable-stayed bridge steel tower combined with the vertical rotation and the horizontal rotation according to claim 1, characterized in that, In step S7, the vertical hinge is set on the box girder, with one end fixedly connected to the box girder and the other end fixedly connected to the outer side of the bottom of the upper tower column. The size of the vertical hinge is the same as the size of the bottom surface of the upper tower column, and the top elevation of the vertical hinge is consistent with the design elevation of the bottom surface of the upper tower column.

5. The construction method of the external tension type cable-stayed bridge steel tower combined with the vertical rotation and the horizontal rotation according to claim 1, characterized in that, In step S5, the traction cable is set between the inner side of the upper tower column and the traction cylinder, and the traction cylinder is fixed on the vertical rotating tower and connected to the traction cable. At least two sets of traction cables are installed on each of the upper tower columns on the left and right sides, and each set of traction cables is symmetrically arranged along the vertical rotation plane; each traction cable is equipped with a traction cylinder.

6. The construction method for an externally oriented cable-stayed bridge steel tower combining vertical and horizontal rotation according to claim 1, characterized in that, In step S6, the backing cable is set between the outer side of the upper tower column and the backing cable cylinder. The backing cable cylinder is fixed to the top surface of the box girder and connected to the backing cable. At least two sets of back cables are installed on each of the upper tower columns on the left and right sides, and each set of back cables is symmetrically arranged along the vertical rotation plane; each back cable is equipped with a back cable hydraulic cylinder.

7. The construction method of the external tension type cable-stayed bridge steel tower combined with the vertical rotation and the horizontal rotation according to claim 1, characterized in that, In step S6, the number of back ropes and traction ropes are equal and their positions are aligned.

8. The construction method of the external tension type cable-stayed bridge steel tower combined with the vertical rotation and the horizontal rotation according to claim 1, characterized in that, In step S9, the horizontal rotation device includes a horizontal rotation hinge installed on the top surface of the box girder and a slide rail, and a cross beam installed and fixed between the upper tower columns on the left and right sides. The horizontal rotation hinge is located at the center of the bridge tower and is set between the top surface of the box girder and the cross beam. The cross beam is set above the horizontal rotation hinge. Four orthogonally arranged sliding shoes are provided at the bottom of the cross beam. The slide rail is set between the top surface of the box girder and the sliding shoes. The slide is an annular slide concentric with the horizontal hinge. The diameter of the annular slide is larger than the diameter of the horizontal hinge and slightly smaller than the width of the box girder. A polytetrafluoroethylene plate is provided between the top of the slide and the slide shoe.

9. The construction method of the steel tower of the outer opening type cable-stayed bridge combined with the vertical rotation and the horizontal rotation according to claim 8, characterized in that, In step S9, the wind cables are placed between the upper tower column and the cross beam, with no fewer than four wind cables arranged symmetrically in all directions.

10. The construction method for an externally oriented cable-stayed bridge steel tower combining vertical and horizontal rotation according to claim 9, characterized in that, In step S9, the installation process of the horizontal rotation device is as follows: the horizontal rotation hinge and the slide are installed on the top surface of the box girder in sequence, a polytetrafluoroethylene plate is set above the slide, a cross beam with a sliding shoe is installed and fixed between the upper tower columns, and finally the wind cable is installed between the cross beam and the upper tower columns.

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