A traction system for midspan load bearing cables

Abstract

The application provides a traction system for a midspan load-bearing cable, comprising: a load-bearing cable used for erecting between a starting cable tower and a terminal cable tower to form a load-bearing structure; a cable releasing device arranged at the side span of the bottom of the starting cable tower and used for releasing the load-bearing cable; a first winch erected at the top of the starting cable tower and used for driving the cable releasing device to release the load-bearing cable; a second winch erected at the top of the starting cable tower and configured with a counter-pulling rope, and used for counter-pulling the position of the load-bearing cable close to the cable releasing device; and a reversing device arranged within the range from the bottom to the top of the starting cable tower and used for adjusting the pulling direction of the counter-pulling rope. The application improves the stress structure of the traction system for the traction installation of the load-bearing cable, so that the load-bearing cable is subjected to counter-pulling constraint and counter-pulling redundancy during traction, and the risk of losing control is reduced while the construction reliability is improved.

Description

Technical Field

[0001] This application relates to the field of traction construction technology, and more specifically, to a traction system for a mid-span load-bearing cable. Background Technology

[0002] As engineering structures that cross obstacles, bridges often face complex construction conditions, such as mountain highway or railway bridges, bridges spanning rivers, and bridges crossing seas. The construction of these types of bridges often encounters complex and ever-changing environmental interference, thus increasing the difficulty of construction.

[0003] In existing technologies, suspension bridges or cable-stayed bridges are commonly used to cross rivers and oceans. They primarily balance the stress on the bridge through the force exerted by suspension cables or stay cables. The construction of suspension cables or stay cables often requires the installation and traction of temporary construction devices, such as the cable traction system for cable-stayed bridges and the catwalk for suspension bridges. Simultaneously, the ropes of these temporary construction devices also need to be installed and tractioned. As the span of the bridge increases, the mass of the aforementioned cable body, composed of stranded or twisted steel strands, also increases. This leads to the risk of cable loss of control during the traction process. Especially during the traction of the load-bearing cable in the mid-span, where the spans of the tower structures on both sides of the mid-span are large, the mass and sag of the load-bearing cable become major factors affecting traction safety as the cable length increases during traction. As the span of the load-bearing cable increases, its own weight has a greater impact. When the force transmitted from the load-bearing cable to the cable release device exceeds the traction force of the cable release device, it will cause the cable release device to automatically release the cable, resulting in the load-bearing cable plunging into the water due to its own weight, causing a construction accident. At the same time, when the sag of the load-bearing cable is too large during the traction process, the traction equipment needs to provide greater traction force to balance the increased directional force caused by the sag. This will lead to an unreasonable increase in the configuration of traction equipment and increase construction costs. Utility Model Content

[0004] This application addresses the shortcomings of existing methods by proposing a traction system for a mid-span load-bearing cable to solve the technical problems existing in related technologies.

[0005] This application provides a traction system for a mid-span load-bearing cable, comprising: Load-bearing cables are used to form a load-bearing structure between the starting tower and the ending tower. A cable release device, located on the side span at the bottom of the starting tower, is used to release the load-bearing cable; The first winch, mounted on top of the starting tower, is used to drive the cable release device to release the load-bearing cable; The second winch is installed on top of the starting tower and equipped with a reverse pull rope for pulling the load-bearing cable back near the release device. A reversing device, located between the bottom and top of the starting tower, is used to adjust the pulling direction of the pull rope.

[0006] Specifically, the main technical concept of this application lies in improving the force-bearing structure of the traction system used for the installation of load-bearing cables, so that the load-bearing cable is simultaneously subjected to counter-tension constraint and counter-tension redundancy during the traction process. The counter-tension constraint will keep the sag of the load-bearing cable within a controllable range to balance the output of the traction force of the traction equipment and reduce the risk of runaway, while the counter-tension redundancy will provide counter-tension buffer when the load-bearing cable suddenly runs away from control, thus avoiding construction accidents.

[0007] Furthermore, the traction system for the mid-span load-bearing cable provided in this application also includes: The third winch is installed at the top of the terminal tower; The traction ropes are respectively connected to the first winch and the third winch; A puller is used to connect the load-bearing cable and the traction rope at both ends.

[0008] Furthermore, the traction system of the mid-span load-bearing cable provided in this application also includes: a sensing unit, which is used to acquire the real-time tension of the traction rope and the counter-tension rope, and to adjust the traction tension of the first winch, the second winch and the third winch.

[0009] Specifically, another technical concept of this application is to utilize the configuration of sensing units to determine the traction state of the traction rope and the counter-traction rope based on the real-time tension of the traction rope and the counter-traction rope, thereby controlling the traction force of each winch so that the traction state of the traction rope and the counter-traction rope is under control and improving the traction reliability of the mid-span load-bearing cable.

[0010] Furthermore, the traction force of the second and third winches is obtained through free cable analysis calculations at unequal height support points.

[0011] In some possible embodiments, the commutator includes a roller seat and a pulley rotatably connected to the roller seat; The roller seat is used to anchor between the cable release device and the bottom of the launching tower; The reverse end of the reverse rope passes through the pulley and is connected to the load-bearing cable.

[0012] Furthermore, the counter-tension end is equipped with a shackle for connecting the load-bearing cable, allowing the counter-tension angle between the counter-tension end and the load-bearing cable to be adjustable. As the load-bearing cable traction progresses, its own weight increases. To ensure its sag is controlled within a manageable range, the counter-tension rope needs to provide a greater counter-tension force to share the weight of the load-bearing cable. After being converted by the pulley, the tension of the counter-tension rope is directed along the top of the starting tower towards the cable release device, opposite to the conversion tension applied by the mid-span load-bearing cable as it transfers its own weight, moving along the cable release device towards the starting tower. A certain angle exists between the counter-tension rope and the load-bearing cable section between the cable release device and the initial tower, causing the tension applied by the counter-tension rope to be roughly converted into a load-bearing component force along the load-bearing cable and a tension component force perpendicular to the load-bearing cable. Since the force of the counter-rotating rope is used to counteract the weight of the load-bearing cable, the smaller the angle between the counter-rotating rope and the load-bearing cable, the higher the efficiency of the second winch's pull force in converting it into the force of the counter-rotating rope. Thus, by adjusting the angle of the counter-rotating rope, the pull output of the second winch can be reduced, thereby improving the reliability of this application.

[0013] Furthermore, the reverse pull end also includes a detachable wire rope buckle, which is used to connect to the load-bearing cable and to connect the shackle. The detachable wire rope buckle makes the connection point between the reverse pull rope and the load-bearing cable adjustable, reducing the difficulty of the reverse pull operation.

[0014] In some possible embodiments, the first winch and the third winch are located on the same cableway line.

[0015] Furthermore, the first winch and the second winch are arranged in parallel.

[0016] Specifically, another technical concept of this application is to arrange the positional relationship of the first winch, the second winch, and the third winch, and to reuse the aforementioned winches, which facilitates the bidirectional transmission of the cable body in the future.

[0017] In some possible embodiments, the traction system for the mid-span load-bearing cable provided in this application further includes: A tower crane, located at the top of the starting tower, is used to hoist the load-bearing cable, thereby raising the traction end of the load-bearing cable to the starting tower, facilitating subsequent connection with the puller and reducing construction difficulty.

[0018] The beneficial technical effects of the technical solutions provided in this application include: During the traction process of the mid-span load-bearing cable, one end of the load-bearing cable is positioned at the bottom of the starting tower via a cable release device. This allows the second winch erected on the starting tower to work in conjunction with the pull rope to create a reverse pull cycle between the bottom and top of the starting tower. This reverse pull on the load-bearing cable at the bottom of the starting tower is used to adjust the sag of the load-bearing cable during traction. As the load-bearing cable is continuously released, its own weight causes it to sag naturally due to the increasing span between the starting and ending towers. If the sag is excessive, the horizontal force exerted on it will surge, requiring the traction system to provide greater traction force, leading to an unreasonable increase in the traction system's capacity. Simultaneously, when the force transmitted by the load-bearing cable's own weight exceeds the traction force released by the cable release device, it will trigger the automatic release of the cable, causing a sudden increase in the cable length, which could lead to the cable plunging into the water or mountains below, causing construction accidents. The presence of the second winch and the counter-tension rope allows for adjustment of the sag of the load-bearing cable and the application of gradually increasing counter-tension as the span of the load-bearing cable increases, maintaining the sag within a controllable range and reducing the risk of the load-bearing cable losing control. Simultaneously, the second winch and counter-tension rope provide redundant counter-tension in the event of a loss of control of the load-bearing cable. When the load-bearing cable suddenly loses control and plunges downwards, the counter-tension rope can buffer the cable, providing cushioning during its downward plunge and improving the traction reliability of the load-bearing cable during its span erection. Meanwhile, this application monitors the real-time tension of the first winch, the second winch and the third winch through the sensing unit, and can judge the traction status of the traction rope and the counter-traction rope, so that the load-bearing cable is always within the controllable range, and the risk of the load-bearing cable losing traction control is greatly reduced. The reverse pull end adjusts its reverse pull angle by using shackles and the length of the reverse pull rope, effectively reducing the additional directional force generated by the reverse pull rope relative to the load-bearing rope, reducing the configuration requirements of the third winch, and thus effectively reducing construction costs. In addition, the first, second, and third winches can be reused by arranging them, so that the unidirectional traction system can be transformed into a bidirectional traction system, which facilitates the subsequent reciprocating traction of the cable and reduces construction costs.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A schematic diagram of the composition of a traction system for a mid-span load-bearing cable provided in an embodiment of this application; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the transverse cross-section of a cat walkway provided in an embodiment of this application; Figure 4 This is a schematic diagram of the plan layout of a traction system provided in an embodiment of this application; Reference numerals: 1. Starting tower; 2. Ending tower; 3. Anchorage; 4. Water body; 11. Load-bearing cable; 12. First winch; 13. Cable release device; 14. Second winch; 15. Reverse rope; 16. Directional switch; 17. Third winch; 18. Traction rope; 19. Puller; 20. Tower; 22. Handrail cable; 23. Gantry; 24. Fourth winch; 25. Fifth winch; 26. Sixth winch; 27. Seventh winch; 28. Eighth winch; 29. ​​Ninth winch; 30. Tenth winch; 31. Eleventh winch; 32. Twelfth winch; 161. Roller seat; 162. Pulley. Detailed Implementation The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0021] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in the specification of this application means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by this art. The term "and / or" as used herein refers to at least one of the items defined by the term; for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0022] This application primarily relates to a traction system for the load-bearing cable of the mid-span, used for traction of the load-bearing cable in the mid-span, possessing advantages such as simple and reliable structure and low construction difficulty. It is worth clarifying that "mid-span" is a conceptual definition of a suspension bridge or cable-stayed bridge, as opposed to the "side spans" of such bridge structures. For example, a double-tower suspension bridge includes the mid-span (main span) and the side spans on both sides of the mid-span; a three-tower suspension bridge includes the two mid-spans in the middle of the bridge and the side spans on both sides. Therefore, the starting tower and ending tower in this application are only used to distinguish the starting and ending points of the load-bearing cable traction, and are not used to define the difference between towers. A tower refers to the tower-shaped structure of a suspension bridge or cable-stayed bridge that supports the main cable. Furthermore, the load-bearing cable in this application should be interpreted broadly as a cable body, applicable to other traction scenarios where counter-tensioning ropes can be used.

[0023] For the traction of load-bearing cables between two towers with large spans, sag control is used to ensure the reliability of the traction process. Therefore, this application incorporates a counter-tension rope during the traction process of the load-bearing cable. By restraining the load-bearing cable with counter-tension, the sag of the cable is kept within a controllable range during traction, thus solving the technical problem of easy traction loss of control during long-distance traction of the load-bearing cable. Simultaneously, the counter-tension rope also provides a redundancy mechanism. Even if the traction of the load-bearing cable loses control, the counter-tension rope at its release end can buffer the loss of control, effectively preventing the traction rope from plunging into the water or mountain below due to excessive force, thus avoiding safety accidents. Furthermore, based on the above research and development approach, this application makes full use of the top of the towers by installing a winch on top to construct the traction system. This reduces the reliance on temporary devices for traction system erection during bridge construction, lowering the difficulty and cost of erecting the traction system. It is worth understanding that the sag of the load-bearing cable is the maximum vertical distance that the line connecting its two ends bends downward during the traction process. It is usually expressed by the sag-to-span ratio, such as 1:10, 1:20, etc. 1:10 means that when the span is 1000m, the sag is 100m.

[0024] The technical solution of this application and how it solves the above-mentioned technical problems are described in detail below with specific embodiments. It should be noted that the following embodiments can be referenced, borrowed, or combined with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be described again.

[0025] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating the composition of a traction system for a mid-span load-bearing cable 11, as provided in one embodiment of this application. This application uses a double-tower suspension bridge as an example, and its application in three-tower suspension bridges or cable-stayed bridges can be deduced accordingly. A double-tower suspension bridge is the most common and standard structural form of suspension bridge, comprising a mid-span (main span) and two side spans. (Reference) Figure 1 As shown, the mid-span in this application refers to the section between the starting tower 1 and the ending tower 2, while the side spans refer to the sections between the anchorage 3 and the starting tower 1, and between the ending tower 2 and the anchorage 3. It is understandable that, since the mid-span is the main structure of the suspension bridge crossing the water body 4 (or mountain) below, its span is relatively large. During the traction process, the sag of the load-bearing cable 11 will increase with the progress of traction, thus posing a risk of loss of control of the load-bearing cable 11. An anchorage refers to a device that uses anchor piles to fix an object.

[0026] Therefore, the traction system provided in this application includes a first winch 12 and a second winch 14 erected on top of the starting tower 1, and a third winch 17 erected on top of the ending tower 2. For ease of understanding, the installation positions of the first winch 12, the second winch 14, and the third winch 17 are described below. Figure 1The diagram shows a top view of the starting tower 1 and an enlarged view of the ending tower 2. The first winch 12 and the second winch 14 are staggered and parallel at the top of the starting tower 1 to respectively mount the traction rope 18 and the counter-traction rope 15. The first winch 12 and the third winch 17 are located on the same cableway line, which can be understood as being on the same horizontal line, and can be used to mount the traction rope 18 between the first winch 12 and the third winch 17. Since the load-bearing cable 11 is connected to the traction rope 18 via a puller 19, the third winch 17 winds up the traction rope 18, while the first winch 12 unwinds it, thus achieving traction of the traction rope 18. It is worth noting that the two ends of the traction rope 18 are wound around the first winch 12 and the third winch 17, respectively. The structure of the puller 19 can be understood by referring to the traction connectors commonly used in bridge construction. Among them, a winch refers to a light and small lifting device that uses a drum to wind a steel wire rope or chain to lift or pull heavy objects.

[0027] Furthermore, during the coordinated traction of the load-bearing cable 11 by the first winch 12, the third winch 17, and the traction rope 18, the second winch 14, the counter-traction rope 15, and the commutator 16 in the traction system operate synchronously. (Refer to...) Figure 2 As shown, Figure 2 for Figure 1 Enlarged diagram of point A in the middle. Figure 2 In this configuration, one end of the reverse tension rope 15 is wound around the second winch 14, and the other end passes through the reversing device 16 and connects to the release end of the load-bearing cable 11, that is, between the release device 13 and the top of the starting tower 1. The release device 13 is a device that winds and stores the cable body, and releases the cable body stored therein under the action of external force, that is, the load-bearing cable 11 is released by the release device 13 when it is being pulled.

[0028] Optionally, the commutator 16 includes a roller seat 161 and a pulley 162 rotatably connected to the roller seat 161. The roller seat 161 is used to anchor between the cable release device 13 and the bottom of the launching tower 1. Figure 2The middle anchor is fixed to the ground foundation of the side span, and the reverse end of the reverse rope 15 passes through the pulley 162 and is connected to the load-bearing cable 11. Therefore, the second winch 14 located at the starting tower 1 can provide traction force in the opposite direction of releasing the load-bearing cable 11, providing a tension force opposite to that of the traction rope 18. Therefore, the counter-tension rope 15 has the following functions: First, it can distribute the weight of the load-bearing cable 11, preventing the load-bearing cable 11 from being affected too much by gravity in the middle span, and balancing the pulling output of the first winch 12 and the third winch 17; Second, the tension of the counter-tension rope 15 can tension the middle span of the load-bearing cable 11, thereby adjusting the sag of the load-bearing cable 11 in the middle span; Third, due to the presence of the counter-tension rope 15, when the load-bearing cable 11 loses control and rushes forward, it can pull back the uncontrolled momentum of the load-bearing cable 11, thereby buffering the loss of control of the load-bearing cable 11 and preventing the load-bearing cable 11 from plunging downwards into the water or mountain when it loses control, thus providing traction insurance for the load-bearing cable 11.

[0029] Alternatively, the roller seat 161 can also be anchored to the bottom of the launching tower 1 by welding to cope with construction constraints.

[0030] Optionally, the tower of the starting tower 1 includes a reversing wheel (not shown in the figure) for steering the load-bearing cable 11. It is worth explaining that the reversing wheel is used to change the orientation of the load-bearing cable 11 from the cable release device 13 toward the top of the starting tower 1 to the top of the starting tower 1 toward the top of the ending tower 2, which facilitates the control of the sag of the load-bearing cable 11 by the pull rope 15 and the traction rope 18.

[0031] Furthermore, the working principle of this application is as follows: the third winch 17 erected at the end tower 2 winds up the cable, while the first winch 12 erected at the starting tower 1 unwinds the cable, causing the traction rope 18 to drive the puller 19 to move towards the end tower 2. Since the load-bearing cable 11 is connected to the traction rope 18 through the puller 19, one end of the load-bearing cable 11 is pulled from the starting tower 1 towards the end tower 2 during the unwinding process of the first winch 12 and the winding process of the third winch 17. The load-bearing cable 11 is stored in the cable release device 13 on the side span at the bottom of the starting tower 1, and the load-bearing cable 11 is gradually released from the cable release device 13 as the traction progresses. Because the load-bearing cable 11 naturally sags under gravity, it has a certain degree of sag. The counter-pull rope 15, wound around the second winch 14, can counter-pull the release end of the load-bearing cable 11 after passing through the commutator 16. The sag of the load-bearing cable 11 is controlled by the constraint of the counter-pull force, thus keeping the sag of the load-bearing cable 11 under control during the traction process. Since the sag of the load-bearing cable 11 is under control during the traction process, the risk of the load-bearing cable 11 suddenly plunging downwards out of control during traction is effectively reduced. At the same time, even if the load-bearing cable 11 suddenly plunges downwards due to uncontrollable factors, the restraint of the counter-pull rope 15 can mitigate the plunging of the load-bearing cable 11, avoiding the occurrence of safety accidents and providing higher traction reliability.

[0032] Optionally, the traction system of the mid-span load-bearing cable 11 provided in this application further includes a sensing unit. The sensing unit is used to acquire the real-time tension of the traction rope 18 and the counter-tension rope 15, and to adjust the traction tension of the first winch 12, the second winch 14, and the third winch 17. It is worth explaining that since the tension exerted by the traction rope 18 and the counter-tension rope 15 on the load-bearing cable 11 is balanced, that is, the sag of the load-bearing cable 11 is under control, the real-time tension monitoring can provide a basis for adjusting the traction tension of the first winch 12, the second winch 14, and the third winch 17, so that the traction tension provided by the second winch 14 can adjust the sag of the load-bearing cable 11, and the traction tension provided by the first winch 12 and the third winch 17 can pull the load-bearing cable 11.

[0033] Optionally, the traction force of the second winch 14 and the third winch 17 can be obtained through free cable analysis calculation at unequal height supports. It is worth noting that the free cable analysis calculation at unequal height supports can be found in the "Road and Bridge Construction Calculation Handbook". Since one end of the load-bearing cable 11 is located at the top of the starting tower 1 and the other end is located on the traction rope 18, and the traction rope 18 has a certain sag, the two ends of the load-bearing cable 11 are at unequal heights. Therefore, the horizontal traction force of the load-bearing cable 11 can be calculated through free cable analysis at unequal height supports. Since the second winch 14 is used to control the sag of the load-bearing cable 11, the counter-tension force required by the second winch 14 and the horizontal traction force required by the third winch 17 can be deduced based on the controlled sag of the load-bearing cable 11.

[0034] Optionally, the reverse pull end is equipped with a shackle for connecting the load-bearing cable 11, allowing the reverse pull angle between the reverse pull end and the load-bearing cable 11 to be adjustable. It is worth explaining that the second winch 14 is located at the top of the starting tower 1, making it difficult to provide traction force opposite to the cable release direction. After the reversing via the directional switch 16, a reverse force is needed. However, there is an angle between the load-bearing cable 11 and the directional switch 16. To balance the component force generated by this angle, the directional switch 16 is positioned as close as possible to the cable release device 13. In practice, the tension applied by the reverse pull rope 15 to the load-bearing cable 11 between the starting tower 1 and the cable release device 13 is roughly converted into a bearing component force along the load-bearing cable 11 and a tension component force perpendicular to the load-bearing cable 11. Since the bearing component force is mainly used to share the weight of the load-bearing cable 11, theoretically, the larger the proportion of the bearing component force in the tension, the higher the conversion efficiency of the reverse pull rope tension. Based on the force component analysis, the smaller the angle between the tension force and the load-bearing load-bearing force, the higher the conversion efficiency of the load-bearing load-bearing force. That is, the smaller the angle between the counter-tension rope 15 and the load-bearing cable 11, the greater the value of the tension provided by the counter-tension rope 15 converted into the load-bearing load-bearing force. Therefore, the smaller the angle, the smaller the tension provided by the counter-tension rope 15 when sharing the same weight. In other words, the smaller the tension angle between the counter-tension rope 15 and the load-bearing cable 11, the smaller the tension output provided by the second winch 14 when sharing the same weight. Therefore, adjusting the tension angle between the counter-tension rope 15 and the load-bearing cable 11 can prevent the counter-tension rope 15 from generating excessive load-bearing force that is not used for the load-bearing cable 11, reducing the maximum rated tension required by the second winch 14, thus reducing the configuration requirements of the second winch. Understandably, given a constant sag, the closer the traction of the load-bearing cable 11 is to the end tower 2, the greater the tension required by the second winch 14 to share the weight of the load-bearing cable 11.

[0035] Optionally, the reverse pull end also includes a detachable wire rope buckle for connecting to the load-bearing cable 11 and for shackle connection, so that the reverse pull end can be easily disassembled when it is pulled close to the starting tower 1 by the load-bearing cable 11, and then fixed again to the load-bearing cable 11 near the cable release device 13, reducing the difficulty of reverse pull cycle operation.

[0036] Optionally, the first winch 12, the second winch 14, and the third winch 17 provided in this application are mounted on the tower 20. The tower 20 is a temporary support structure erected on the top of the launching tower 1, used to mount various temporary equipment.

[0037] Optionally, a tower crane (not shown in the figure) is also installed on the tower 20. It can be understood by referring to the tower crane on the top of the tower in bridge construction. The tower crane is used to lift the load-bearing cable 11 at the bottom of the starting tower 1 to the top of the starting tower 1.

[0038] Optionally, the load-bearing cable 11 provided in this application can be the load-bearing cable 11 of the gantry 23 or the catwalk cable. Since the catwalk refers to a linear temporary construction path erected under and parallel to the main cable during suspension bridge construction, it runs throughout the entire construction of the suspension bridge deck system. The catwalk is erected after the traction rope 18 is completed. It is understood that the traction rope 18 is initially wound around the first winch 12, and then connected to the third winch 17 via a pilot cable in conjunction with ferries, drones, rockets, etc., thus forming the traction rope 18 connecting the starting tower 1 and the ending tower 2.

[0039] Please see Figure 3 , Figure 3 This is a schematic cross-sectional view of a catwalk provided in one embodiment of this application. The catwalk includes a mast 23, mast 23 load-bearing cables 11 for supporting the top two sides of the mast 23, handrail cables 22 disposed in the middle of the mast 23, and catwalk cables (not shown) disposed at the bottom of the mast 23 for erecting a temporary walkway. The traction system provided in this application first pulls the mast 23 load-bearing cables 11 with a traction rope 18, then installs the mast 23 based on the mast 23 traction cables, and then pulls the handrail cables 22 and catwalk cables through the traction system and the mast 23, thereby completing the erection of the catwalk.

[0040] In some possible embodiments, please refer to Figure 4 , Figure 4 This is a schematic plan view of a traction system provided in one embodiment of this application. This application can reuse the first winch 12, the second winch 14, and the third winch 17 provided in the traction system. Since the main cable of a suspension bridge consists of hundreds of strands, unidirectional traction would inevitably extend the construction period. Therefore, this application also reuses the traction system for bidirectional traction of the main cable strands later. According to... Figure 4 The first winch 12 and the third winch 17 are reused on the first cableway line, and the second winch 14 is reused on the second cableway line. It is worth explaining that the suspension cables are erected on the side spans and middle spans of the suspension bridge. The first cableway line includes the fourth winch 24 located at the anchorage 3 on the side of the starting tower 1, the fifth winch 25 and the first winch 12 located at the top of the starting tower 1, the third winch 17 and the sixth winch 26 located at the terminal tower 2, and the seventh winch 27 located at the anchorage 3 on the side of the terminal tower 2. The second cableway line includes the eighth winch 28 located at the anchorage 3 on the side of the starting tower 1, the second winch 14 and the ninth winch 29 located at the top of the starting tower 1, the tenth winch 30 and the eleventh winch 31 located at the terminal tower 2, and the twelfth winch 32 located near the anchorage 3 on the side of the terminal tower 2. By working together on the first and second cableways, the construction time for erecting the main cable strands can be shortened.

[0041] In summary, this application provides a traction system for a mid-span load-bearing cable. The traction system uses a first winch, a third winch, and a traction rope positioned between them to pull the load-bearing cable. A second winch, in conjunction with a directional switch and a counter-tension rope, provides counter-tension to the load-bearing cable at the cable release point. This ensures that the sag of the load-bearing cable remains controllable during traction, reducing the risk of loss of control during large-span traction. Simultaneously, the counter-tension rope provides redundancy for the load-bearing cable; even if the load-bearing cable loses control, the counter-tension rope can buffer the loss of control, improving the reliability of the load-bearing cable traction.

[0042] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in related technologies that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0043] In the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate directions or positional relationships based on the exemplary directions or positional relationships shown in the accompanying drawings. They are used to facilitate the description or simplification of the embodiments of this application and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0047] The above description is only a partial implementation of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application, without departing from the technical concept of this application, also fall within the protection scope of the embodiments of this application.

Claims

1. A traction system for a mid-span load-bearing cable, characterized in that, include: Load-bearing cables are used to form a load-bearing structure between the starting tower and the ending tower. A cable release device, located on the side span at the bottom of the starting tower, is used to release the load-bearing cable; The first winch, mounted on top of the starting tower, is used to drive the cable release device to release the load-bearing cable; The second winch is installed on top of the starting tower and equipped with a reverse pull rope for pulling the load-bearing cable back near the release device. A reversing device, located between the bottom and top of the starting tower, is used to adjust the pulling direction of the pull rope.

2. The traction system for the mid-span load-bearing cable as described in claim 1, characterized in that, Also includes: The third winch is installed at the top of the terminal tower; The traction ropes are respectively connected to the first winch and the third winch; A puller is used to connect the load-bearing cable and the traction rope at both ends.

3. The traction system for the mid-span load-bearing cable as described in claim 2, characterized in that, Also includes: The sensing unit is used to acquire the real-time tension of the traction rope and the counter-traction rope, and to adjust the traction tension of the first winch, the second winch and the third winch.

4. The traction system of the mid-span load-bearing cable as described in claim 3, characterized in that, The traction force of the second and third winches was obtained through free cable analysis calculations at unequal height support points.

5. The traction system for the mid-span load-bearing cable as described in claim 1, characterized in that, The commutator includes a roller seat and a pulley rotatably connected to the roller seat; The roller seat is used to anchor between the cable release device and the bottom of the launching tower; The reverse end of the reverse rope passes through the pulley and is connected to the load-bearing cable.

6. The traction system for the mid-span load-bearing cable as described in claim 5, characterized in that, The reverse pull end is provided with a shackle for connecting the load-bearing cable.

7. The traction system for the mid-span load-bearing cable as described in claim 6, characterized in that, The reverse pull end also includes a detachable wire rope buckle, which is used to connect the load-bearing cable and to allow the shackle to connect.

8. The traction system for the mid-span load-bearing cable as described in claim 1, characterized in that, The first winch and the third winch are located on the same cableway line.

9. The traction system of the mid-span load-bearing cable as described in claim 8, characterized in that, The first winch and the second winch are arranged in parallel.

10. The traction system for the mid-span load-bearing cable as described in claim 1, characterized in that, Also includes: A tower crane, located at the top of the starting tower, is used to hoist the load-bearing cable.

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