Tensioning and pre-tightening system and method for rotary main cable strand

Abstract

The invention discloses a rotary main cable strand tensioning and pre-tightening system and method, and relates to the technical field of suspension bridge main cable erection, the rotary main cable strand tensioning and pre-tightening system comprises two sets of embedded parts, two tensioning devices and steel strands corresponding to the tensioning devices, one set of embedded parts is arranged on one side of an anchorage, and the other set of embedded parts is arranged on the other side of the anchorage. One tensioning device is correspondingly arranged on one set of embedded parts, one end of each steel strand is connected with the corresponding tensioning device, the other end of each steel strand is connected with the corresponding cable strand, and the two tensioning devices tension the steel strands so as to simultaneously tension and pre-tighten all the cable strands arranged between the horizontal main cable saddle and the two horizontal rotating cable saddles. The cable strands between the two horizontal rotating cable saddles and the horizontal main cable saddle can be tensioned and pre-tightened at the same time through the two tensioning devices, the required pre-tightening force is achieved, it is guaranteed that the cable strand loads of the two horizontal rotating cable saddles are balanced, the cable strands on the two sides of the anchorage are evenly stressed, the cable strand erecting efficiency is improved, and the cable strand linear quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of main cable installation for suspension bridges, and in particular to a system and method for pre-tensioning a rotary main cable strand. Background Art

[0002] A slewing main cable refers to a main cable that can slew around a certain center point or axis. In bridge structures, it is usually used in single-tower suspension bridges and ground-anchored suspension bridges. As the main component for bearing and transmitting loads, the installation of slewing main cable strands usually involves dividing the main cable into several strands, which are pulled and saddled one by one. The overall order of slewing main cable strands being saddled is: horizontal main cable saddle being saddled, horizontal rotating cable saddle being saddled, main tower top main cable saddle being saddled, and loose cable saddle being saddled.

[0003] In the prior art, the main cable strands of the rotary cable are always in a relaxed state after the horizontal main cable saddle is installed and before the main cable saddle on the top of the main tower is installed. Due to the friction between the strands at the horizontal rotary saddle and the horizontal rotary saddle, when the strands at the horizontal rotary saddle are tightened, it is very easy to cause unbalanced loads on the strands on both sides of the horizontal rotary saddle, resulting in uneven force on the main cable strands. Summary of the Invention

[0004] The embodiments of the present invention provide a system and method for pre-tensioning a rotating main cable strand to solve the technical problem in the related art that when the strands at the existing horizontal rotating saddle are tightened, it is very easy to cause unbalanced loads on the strands on both sides of the horizontal rotating saddle, resulting in uneven force on the main cable strands.

[0005] In a first aspect, a rotary main cable strand tensioning and pre-tensioning system is provided for tensioning all cables disposed between a horizontal main cable saddle and two horizontal rotary cable saddles, comprising: Two groups of embedded parts, one group of embedded parts is arranged on one side of the anchor; Two tensioning devices, one of the tensioning devices is correspondingly provided on a group of the embedded parts; A steel strand corresponding to each tensioning device, one end of the steel strand being connected to the tensioning device and the other end being connected to the corresponding cable strand; The two tensioning devices tension the steel strands to simultaneously tension and pre-tighten all the cable strands arranged between the horizontal main cable saddle and the two horizontal rotation cable saddles.

[0006] In some embodiments, each of the tensioning devices comprises: Two brackets, the two brackets are spaced apart and arranged on a group of embedded parts; A tensioning assembly, the tensioning assembly being arranged on one side of the two brackets in a vertical direction, and the tensioning assembly being connected to one end of the steel strand; A fixing assembly is provided on the corresponding cable strand and connected to the other end of the steel strand.

[0007] In some embodiments, the tensioning assembly includes: An anchor beam, the anchor beam is provided on one side of the two brackets and is detachably connected thereto; A through-type jack is provided below the anchor beam and is connected to one end of the steel strand for tensioning the steel strand.

[0008] In some embodiments, a triangular bracket is provided below the anchor beam, and the through-type jack is provided on the triangular bracket.

[0009] In some embodiments, the tensioning assembly further comprises: A plurality of stiffening plates, one of which is correspondingly arranged at the connection between the anchor beam and the bracket.

[0010] In some embodiments, the tensioning assembly further comprises: A fall chain is arranged above the anchor beam and connected to the circular hole on the anchor beam, and is used to lift the anchor beam.

[0011] In some embodiments, the fixing assembly includes: A cable gripper, the cable gripper being provided on the corresponding cable strand; An anchor box is arranged at the other end of the steel strand and is detachably connected to the cable gripper.

[0012] In a second aspect, a method for pre-tensioning a slewing main cable strand is provided, using the aforementioned slewing main cable strand pre-tensioning system, comprising the following steps: Step S10: symmetrically arrange two sets of embedded parts on both sides of the anchor, and one set of embedded parts is correspondingly provided with a tensioning device and a steel strand; Step S20, using two tensioning devices to tension the steel strands to simultaneously tension and pre-tighten the first cable strand disposed between the horizontal main cable saddle and the two horizontal transfer cable saddles; Step S30: adjusting the positions of the two tensioning devices according to the tensioning height of the next cable strand, and using the two tensioning devices to tension the steel strand to simultaneously tension and pre-tighten the next cable strand disposed between the horizontal main cable saddle and the two horizontal transfer cable saddles; Step S40: repeat step S30 until all cables are tensioned and pre-tightened.

[0013] In some embodiments, the step of using two tensioning devices to tension the steel strands to simultaneously tension and pre-tighten the first cable strand disposed between the horizontal main cable saddle and the two horizontal transfer cable saddles includes: The two anchor heads of the first cable strand are pulled out from the anchorage laying area, and the first cable strand is pulled to the horizontal main cable saddle and two horizontal rotation cable saddles of the anchorage on the opposite bank for anchoring. The two tensioning devices are started to tension the steel strands to simultaneously tension and pre-tighten the first cable strand arranged between the horizontal main cable saddle and the two horizontal rotation cable saddles.

[0014] In some embodiments, the step of adjusting the positions of the two tensioning devices according to the tensioning height of the next cable strand and using the two tensioning devices to tension the steel strands to simultaneously tension and pre-tension the next cable strand disposed between the horizontal main cable saddle and the two horizontal transfer cable saddles includes: The two tensioning devices on both sides of the anchor are lifted in sequence according to the tensioning height of the next cable strand, so that the heights of the tensioning devices on both sides of the anchor match the tensioning height of the next cable strand.

[0015] The beneficial effects brought about by the technical solution provided by the present invention include: An embodiment of the present invention provides a system and method for tensioning and pre-tensioning a rotating main cable strand, wherein the system comprises two groups of embedded parts, two tensioning devices, and steel strands corresponding to each tensioning device. One group of embedded parts is arranged on one side of the anchor, and one tensioning device is correspondingly arranged on one group of embedded parts. One end of the steel strand is connected to the tensioning device, and the other end is connected to the corresponding cable strand. The two tensioning devices tension the steel strands to simultaneously tension and pre-tighten all cable strands arranged between the horizontal main saddle and the two horizontal rotation saddles. The two tensioning devices can simultaneously tension and pre-tighten the cable strands between the horizontal main saddle and the two horizontal rotation saddles and make them reach the required pre-tightening force, thereby ensuring that the cable strand loads of the two horizontal rotation saddles are balanced, making the cable strands on both sides of the anchor evenly stressed, improving the cable strand erection efficiency, and ensuring the cable strand linear quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the overall structure of a rotary main cable strand tensioning and pre-tensioning system provided by an embodiment of the present invention; Figure 2 A schematic elevational structural diagram of a rotary main cable strand tensioning and pre-tensioning system provided by an embodiment of the present invention; Figure 3 A schematic plan view of the structure of a rotary main cable strand tensioning and pre-tensioning system provided by an embodiment of the present invention; Figure 4A schematic structural diagram of a fall chain and an anchor beam provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a cable gripper and an anchor box separated from each other provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of the connection between the cable gripper and the anchor box provided in an embodiment of the present invention; Reference numerals: 1. Embedded parts; 2. Anchorage; 3. Tensioning device; 31. Bracket; 32. Tensioning assembly; 321. Anchor beam; 3211. Triangular bracket; 3212. Round hole; 322. Through-hole jack; 323. Stiffener; 324. Fall chain; 33. Fixing assembly; 331. Cable grip; 332. Anchor box; 4. Steel strand; 5. Horizontal main saddle; 6. Horizontal rotation saddle; 7. Claim shares. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0019] The embodiments of the present invention provide a system and method for tensioning and pre-tensioning a rotating main cable strand, which can solve the technical problem in the related art that when the strands at the existing horizontal turning saddle are tightened, it is very easy to cause unbalanced loads on the strands on both sides of the horizontal turning saddle, resulting in uneven force on the main cable strands.

[0020] Figure 1 A revolving main cable strand tensioning and pre-tensioning system provided in an embodiment of the present invention is used for tensioning all cable strands 7 arranged between a horizontal main cable saddle 5 and two horizontal rotation cable saddles 6, comprising: two groups of embedded parts 1, two tensioning devices 3, and steel strands 4 corresponding to each of the tensioning devices 3; one group of the embedded parts 1 is arranged on one side of the anchor 2, and one tensioning device 3 is correspondingly arranged on a group of the embedded parts 1, one end of the steel strand 4 is connected to the tensioning device 3, and the other end is connected to the corresponding cable strand 7, and the two tensioning devices 3 tension the steel strand 4 to simultaneously tension and pre-tighten all cable strands 7 arranged between the horizontal main cable saddle 5 and the two horizontal rotation cable saddles 6.

[0021] The embodiment of the present invention provides a tensioning and pre-tensioning system for a rotary main cable strand, which is provided with two groups of embedded parts, two tensioning devices, and steel strands corresponding to each tensioning device. One group of embedded parts is provided on one side of the anchor, and one tensioning device is provided on a corresponding group of embedded parts. One end of the steel strand is connected to the tensioning device, and the other end is connected to the corresponding strand. The two tensioning devices tension the steel strands to simultaneously tension and pre-tighten all the strands provided between the horizontal main saddle and the two horizontal rotating saddles. The tensioning device can simultaneously tension and pre-tighten the cable strands between the two horizontal rotation saddles and the horizontal main cable saddle and achieve the required pre-tightening force, thereby ensuring that the cable strand loads of the two horizontal rotation saddles are balanced, and the cable strands on both sides of the anchor are evenly stressed, thereby improving the cable strand erection efficiency and ensuring the cable strand linear quality. The two tensioning devices can also prevent the horizontal section of the cable strand between the two horizontal rotation saddles from sagging under its own weight, resulting in cable strand steel wire dislocation and cable strand midpoint deviation, thereby improving the quality of cable strand tensioning and erection.

[0022] As an optional implementation, in one embodiment of the invention, see Figure 1 and Figure 2 As shown, each of the tensioning devices 3 includes: two brackets 31, a tensioning assembly 32 and a fixing assembly 33. The two brackets 31 are arranged at intervals on a group of embedded parts 1. The tensioning assembly 32 is arranged on one side of the two brackets 31 in the vertical direction. The tensioning assembly 32 is connected to one end of the steel strand 4. The fixing assembly 33 is arranged on the corresponding cable strand 7 and connected to the other end of the steel strand 4. One bracket 31 is fixed to one side of the anchor 2 through a group of embedded parts 1. The bracket 31 is used to fix the tensioning assembly 32. The steel strand 4 is arranged between the tensioning assembly 32 and the fixing assembly 33. The steel strand 4 is connected to the corresponding cable strand 7 through the fixing assembly 33. The tensioning assembly 32 tensions the steel strand 4 to pre-tighten the cable strand 7.

[0023] As an optional implementation, in one embodiment of the invention, see Figure 2 and Figure 3As shown, the tensioning assembly 32 includes: an anchor beam 321 and a through-type jack 322. The anchor beam 321 is provided on one side of the two brackets 31 and is detachably connected thereto. The through-type jack 322 is provided below the anchor beam 321. The through-type jack 322 is connected to one end of the steel strand 4 for tensioning the steel strand 4. A plurality of bolt holes are provided on the flange plate of the anchor beam 321 and on the bracket 31. The anchor beam 321 is connected to the two brackets 31 by bolts, which is convenient for disassembly. The position and height of the anchor beam 321 can be arbitrarily adjusted according to the height of the cable strand 7 to be tensioned, and the bolt connection has high load-bearing capacity and reliability. A large circular hole is also provided at the lower end of the flange plate of the anchor beam 321 for passing the steel strand 4 so that the steel strand 4 is connected to the through-type jack 322. The through-type jack 322 tensions the steel strand 4 to pre-tighten the cable strand 7.

[0024] As an optional implementation, in one embodiment of the invention, see Figure 2 and Figure 3 As shown, a triangular bracket 3211 is provided under the anchor beam 321, and the through-type jack 322 is provided on the triangular bracket 3211. The triangular bracket 3211 has a strong load-bearing capacity, can maintain the stability of the structure, is not prone to deformation or tipping, and can provide stable and reliable support.

[0025] As an optional implementation, in one embodiment of the invention, see Figure 3 and Figure 4 As shown, the tensioning assembly 32 also includes: multiple stiffening plates 323, one of the stiffening plates 323 is correspondingly arranged at the connection between the anchor beam 321 and the bracket 31, and the stiffening plate 323 can increase the structural rigidity and stability, and can also increase the bending rigidity of the anchor beam 321, thereby improving the stress distribution of the anchor beam 321 and preventing the anchor beam 321 from being locally subjected to excessive force, resulting in the flange plate being torn.

[0026] As an optional implementation, in one embodiment of the invention, see Figure 4 As shown, the tensioning assembly 32 further includes a fall chain 324, which is arranged above the anchor beam 321 and connected to the circular hole 3212 on the anchor beam 321, and is used to lift the anchor beam 321. The fall chain 324 can lift the anchor beam 321 to adapt to the tensioning and pre-tensioning of cable strands 7 at different positions and heights. After the tensioning and pre-tensioning of the first cable strand 7 is completed, the two anchor beams 321 are removed from the two brackets 31, and the fall chain 324 is used to lift the two anchor beams 321 according to the tensioning height of the next cable strand 7, so that the height of the two anchor beams 321 and the two through-type jacks 322 matches the tensioning height of the next cable strand 7.

[0027] As an optional implementation, in one embodiment of the invention, see Figure 5 and Figure 6 As shown, the fixing assembly 33 includes: a cable grip 331 and an anchor box 332, the cable grip 331 is provided on the corresponding cable strand 7, the anchor box 332 is provided at the other end of the steel strand 4 and is detachably connected to the cable grip 331, and a round hole is provided on the top of the anchor box 332 for connecting with the cable grip 331 through a pin shaft. After the tensioning and pre-tightening of the first cable strand 7 is completed, the anchor box 332 is disconnected from the cable grip 331 and the cable grip 331 is removed, and the cable grip 331 is fixed to the next cable strand 7, and the other end of the steel strand 4 and the anchor box 332 are connected to the cable grip 331 again, and the steel strand 4 is tensioned by the through-type jack 322 to tension and pre-tighten the next cable strand 7.

[0028] In a second aspect, a method for pre-tensioning a slewing main cable strand is provided, using the aforementioned slewing main cable strand pre-tensioning system, comprising the following steps: Step S10: symmetrically arrange two groups of embedded parts 1 on both sides of the anchor 2, and a tensioning device 3 and a steel strand 4 are correspondingly arranged on each group of embedded parts 1; Step S20: Using two tensioning devices 3 to tension the steel strands 4 to simultaneously tension and pre-tighten the first cable strand 7 disposed between the horizontal main cable saddle 5 and the two horizontal transfer cable saddles 6; Step S30: adjusting the positions of the two tensioning devices 3 according to the tensioning height of the next cable strand 7, and using the two tensioning devices 3 to tension the steel strand 4 to simultaneously tension and pre-tighten the next cable strand 7 disposed between the horizontal main cable saddle 5 and the two horizontal transfer cable saddles 6; Step S40: repeat step S30 until all the cables 7 are tensioned and pre-tightened.

[0029] The method for pre-tensioning the rotary main cable strands of the embodiment of the present invention is as follows: during anchoring construction, two sets of embedded parts are symmetrically arranged on the saddle groove walls on both sides of the anchor center axis, and the tensioning device and the steel strand are respectively installed and fixed on each set of embedded parts, that is, two brackets, anchor beams, through-type jacks, cable grippers and anchor boxes are respectively installed on both sides of the anchor center axis in sequence, and the tensioning device, that is, the through-type jacks, cable grippers and anchor boxes are started to tension the steel strands to simultaneously tension and pre-tighten the first cable strand arranged between the horizontal main cable saddle and the two horizontal rotating cable saddles, and then the anchor is adjusted according to the tensioning height of the next cable strand. The position of the beam and the through-type jack is adjusted, and the tensioning device is started again, that is, the through-type jack is used to tension the steel strand to simultaneously tension and pre-tighten the next cable strand arranged between the horizontal main cable saddle and the two horizontal rotation cable saddles, until the tensioning and pre-tightening of all cable strands are completed. The two tensioning devices can simultaneously tension and pre-tighten the cable strands between the two horizontal rotation cable saddles and the horizontal main cable saddle and make them reach the required pre-tightening force, ensure the cable strand load balance of the two horizontal rotation cable saddles, make the cable strands on both sides of the anchorage bear the force evenly, improve the cable strand erection efficiency, and ensure the cable strand linear quality.

[0030] As an optional embodiment, in one embodiment of the invention, the step of using two tensioning devices 3 to tension the steel strands 4 to simultaneously tension and pre-tighten the first cable strand 7 arranged between the horizontal main cable saddle 5 and the two horizontal rotation cable saddles 6 includes: pulling out the two anchor heads of the first cable strand 7 from the cable-releasing area of the anchor 2, and pulling the first cable strand 7 to the horizontal main cable saddle 5 and the two horizontal rotation cable saddles 6 of the opposite bank anchor 2 for anchoring, and starting the two tensioning devices 3 to tension the steel strands 4 to simultaneously tension and pre-tighten the first cable strand 7 arranged in the horizontal main cable saddle 5 and the horizontal rotation cable saddle 6.

[0031] Specifically, the two anchor heads of the first cable strand 7 are pulled out from the cable-releasing area of the anchor 2, and the first cable strand 7 is pulled into the horizontal main cable saddle 5 and the two horizontal rotation cable saddles 6 of the opposite-bank anchor 2 for anchoring. After the first cable strand 7 enters the horizontal main cable saddle 5 and the two horizontal rotation cable saddles 6 of the opposite-bank anchor 2, the cable gripper 331 is connected to the corresponding cable strand 7, and then the anchor box 332 is connected to the cable gripper 331, and the two tensioning devices 3, i.e., the through-type jacks 322, are started to tension the steel strand 4, so as to simultaneously tension and pre-tighten the first cable strand 7 arranged in the horizontal main cable saddle 5 and the horizontal rotation cable saddle 6. After the tensioning force of the first cable strand 7 reaches the preset value, the first cable strand 7 is inserted into the bridge tower main cable saddle and the opposite-bank anchorage loose cable saddle, thereby completing the tensioning and erection of the first cable strand 7.

[0032] As an optional implementation, in one embodiment of the invention, the step of adjusting the positions of the two tensioning devices 3 according to the tensioning height of the next cable strand 7, and using the two tensioning devices 3 to tension the steel strand 4 to simultaneously tension and pre-tighten the next cable strand 7 arranged between the horizontal main cable saddle 5 and the two horizontal rotation cable saddles 6, includes: sequentially raising the two tensioning devices 3 on both sides of the anchor 2 according to the tensioning height of the next cable strand 7, so that the heights of the tensioning devices 3 on both sides of the anchor 2 match the tensioning height of the next cable strand 7.

[0033] Specifically, after the tensioning and pre-tightening of the first cable strand 7 is completed, the two anchor beams 321 are removed from the two brackets 31, and the two anchor beams 321 are sequentially lifted using the fall chains 324 according to the tensioning height of the next cable strand 7, so that the heights of the two anchor beams 321 and the two through-type jacks 322 match the tensioning height of the next cable strand 7.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0036] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is to be construed in the widest possible manner consistent with the principles and novel features of the present invention.

Claims

1. A main cable strand tensioning and pre-tensioning system for tensioning all cables (7) arranged between a horizontal main cable saddle (5) and two horizontal rotating cable saddles (6), characterized in that: include: Two groups of embedded parts (1), one group of embedded parts (1) is arranged on one side of the anchor (2); Two tensioning devices (3), one tensioning device (3) being correspondingly provided on a group of embedded parts (1); A steel strand (4) corresponding to each tensioning device (3), one end of the steel strand (4) being connected to the tensioning device (3) and the other end being connected to the corresponding cable strand (7); The two tensioning devices (3) tension the steel strands (4) to simultaneously tension and pre-tighten all the cable strands (7) disposed between the horizontal main cable saddle (5) and the two horizontal rotating cable saddles (6).

2. The main cable strand tensioning and pre-tensioning system according to claim 1, characterized in that: Each of the tensioning devices (3) comprises: Two brackets (31), the two brackets (31) are arranged on a group of embedded parts (1) at intervals; A tensioning assembly (32), the tensioning assembly (32) being arranged on one side of the two brackets (31) in a vertical direction, and the tensioning assembly (32) being connected to one end of the steel strand (4); A fixing assembly (33), the fixing assembly (33) being arranged on the corresponding cable strand (7) and connected to the other end of the steel strand (4).

3. The main cable strand tensioning and pre-tensioning system according to claim 2, characterized in that: The tensioning assembly (32) comprises: An anchor beam (321), the anchor beam (321) is provided on one side of the two brackets (31) and is detachably connected thereto; A through-type jack (322), the through-type jack (322) is arranged below the anchor beam (321), and the through-type jack (322) is connected to one end of the steel strand (4) and is used for tensioning the steel strand (4).

4. The main slewing cable strand tensioning and pre-tensioning system according to claim 3, characterized in that: A triangular bracket (3211) is provided below the anchor beam (321), and the through-type jack (322) is provided on the triangular bracket (3211).

5. The main cable strand tensioning and pre-tensioning system according to claim 3, characterized in that: The tensioning assembly (32) further comprises: A plurality of stiffening plates (323), one stiffening plate (323) being correspondingly provided at a connection between the anchor beam (321) and the bracket (31).

6. The main slewing cable strand tensioning and pre-tensioning system according to claim 3, characterized in that: The tensioning assembly (32) further comprises: A fall chain (324) is provided above the anchor beam (321) and connected to the circular hole (3212) on the anchor beam (321), and is used to lift the anchor beam (321).

7. The main cable strand tensioning and pre-tensioning system according to claim 2, characterized in that: The fixing assembly (33) comprises: A cable gripper (331), the cable gripper (331) being provided on the corresponding cable strand (7); An anchor box (332), the anchor box (332) is provided at the other end of the steel strand (4) and is detachably connected to the cable gripper (331).

8. A method for pre-tensioning a slewing main cable strand, using the slewing main cable strand pre-tensioning system according to claim 1, characterized in that: The following steps are involved: Step S10, symmetrically arranging two groups of embedded parts (1) on both sides of the anchor (2), and correspondingly arranging a tensioning device (3) and a steel strand (4) on each group of embedded parts (1); Step S20, using two tensioning devices (3) to tension the steel strands (4) to simultaneously tension and pre-tighten the first cable strand (7) disposed between the horizontal main cable saddle (5) and the two horizontal transfer cable saddles (6); Step S30, adjusting the positions of the two tensioning devices (3) according to the tensioning height of the next cable strand (7), and using the two tensioning devices (3) to tension the steel strand (4) to simultaneously tension and pre-tighten the next cable strand (7) disposed between the horizontal main cable saddle (5) and the two horizontal transfer cable saddles (6); Step S40, repeating step S30 until all the cables (7) are tensioned and pre-tightened.

9. The method for pre-tensioning the rotary main cable strand according to claim 8, characterized in that: The step of using two tensioning devices (3) to tension the steel strands (4) to simultaneously tension and pre-tighten the first cable strand (7) disposed between the horizontal main cable saddle (5) and the two horizontal transfer cable saddles (6) comprises: The two anchor heads of the first cable strand (7) are pulled out from the cable-laying area of the anchor (2), and the first cable strand (7) is pulled to the horizontal main cable saddle (5) and two horizontal rotation cable saddles (6) of the anchor (2) on the opposite bank for anchoring, and the two tensioning devices (3) are started to tension the steel strands (4) to simultaneously tension and pre-tighten the first cable strand (7) arranged between the horizontal main cable saddle (5) and the two horizontal rotation cable saddles (6).

10. The method for pre-tensioning the rotary main cable strands according to claim 9, characterized in that: The steps of adjusting the positions of the two tensioning devices (3) according to the tensioning height of the next cable strand (7), and using the two tensioning devices (3) to tension the steel strand (4) to simultaneously tension and pre-tighten the next cable strand (7) arranged between the horizontal main cable saddle (5) and the two horizontal transfer cable saddles (6) include: The two tensioning devices (3) on both sides of the anchor (2) are sequentially lifted according to the tensioning height of the next cable strand (7), so that the heights of the tensioning devices (3) on both sides of the anchor (2) match the tensioning height of the next cable strand (7).

Images