Long-span suspension bridge stiffening beam erection system and use method thereof

Abstract

The present invention discloses a system for erecting stiffening beams of a large-span suspension bridge and a method for using the system. A temporary sling is installed on the main cable, and then a bearing cable support beam is installed and a walking bearing cable mechanism is erected. The main cable is used to bear the load, and beam erection equipment is fully saved. The traction mechanism, under the driving action of a first winch, drives a stiffening beam transportation and lifting device that has obtained the stiffening beam to move from one of the bridge towers along the length direction of the walking bearing cable mechanism until it reaches the installation position, and then continues to move forward to reach the other bridge tower to obtain the stiffening beam, so that the construction efficiency is doubled, and only one stiffening beam transportation and lifting device is used to realize the symmetrical installation of the stiffening beam from the span of the main cable to both sides, thereby solving the problem of erecting stiffening beams of large-span suspension bridges when transportation is inconvenient in mountainous areas and the vertical lifting height is too large. In addition, the rotating rope of the traction mechanism is set in a ring shape and is directly installed on the bearing cable support beam, and is driven by the first winch, thereby avoiding the problem that the traction mechanism is directly connected to the winch and the rope coiling pressure is large.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more specifically, to a system for erecting a stiffening beam of a long-span suspension bridge and a method for using the system. Background Art

[0002] Recently, more and more bridges have been built in mountainous areas in China. The mountainous areas have complex topography, large height differences, and crisscrossing valleys. Suspension bridges have great advantages in mountainous and canyon areas due to their excellent spanning capabilities. At the same time, the construction of large-span suspension bridges in mountainous areas also faces the problems of inconvenient transportation and large clearance under the bridge.

[0003] At present, the erection methods of stiffening beams for mountain suspension bridges implemented in China include the erection method of bridge deck crane, the erection method of cable-mounted crane with beam, the erection method of traveling load-bearing cable-transported beam and the erection method of cable crane. Among them, the bridge deck crane is suitable for the assembly process of scattered parts of steel truss suspension bridges. The assembly of scattered parts by bridge deck crane has the disadvantages of long construction period and difficulty in controlling the linear shape of stiffening beams. It is rarely used in China, and most of them adopt the process of segmental lifting. The cable-mounted crane with beam uses the main cable to bear the force for horizontal transportation of stiffening beams, but frequent cable clamps lead to slow travel speed and easy damage to the main cable; the traveling load-bearing cable-transported beam can only solve the problem of horizontal transportation of stiffening beams, and needs to cooperate with the cable-mounted crane to complete the installation of stiffening beams, and the equipment investment is relatively large; the cable crane needs to re-establish a set of force systems, without using the main cable structure, resulting in a large amount of wire rope. In the case of super-large span and super-heavy stiffening beam segments, the construction is difficult and the economic benefits are low. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] Another object of the present invention is to provide a system for erecting stiffening beams for a large-span suspension bridge and a method for using the system, which uses only one set of stiffening beam transportation and lifting devices to achieve symmetrical installation of the stiffening beams from the mid-span of the main cable to both sides, thereby solving the problem of erecting stiffening beams for large-span suspension bridges when transportation is inconvenient in mountainous areas and the vertical lifting height is too high.

[0006] In order to achieve these purposes and other advantages according to the present invention, a long-span suspension bridge stiffening girder erection system is provided, which comprises:

[0007] A plurality of pairs of temporary slings are evenly spaced along the length direction of the main cable, and any pair of temporary slings are respectively arranged on both sides of the main cable, and the upper end of any temporary sling is connected to the main cable, and the lower end extends vertically downward;

[0008] A plurality of load-bearing cable support beams, wherein the lower ends of a pair of temporary slings are connected to a load-bearing cable support beam;

[0009] A traveling load-bearing cable mechanism, which extends along the length direction of the main cable, and whose two ends are respectively connected to the anchoring systems of the bridge towers on both sides, and the traveling load-bearing cable mechanism is fixedly connected to the upper surface of each load-bearing cable support beam;

[0010] A stiffening beam transport and lifting device, which is used to hoist the stiffening beam to be installed, wherein the upper end of the stiffening beam transport and lifting device is slidably connected to the traveling load-bearing cable mechanism, and the lower end is connected to the stiffening beam to be installed;

[0011] The traction mechanism includes two annular closed rotating ropes arranged at intervals along the transverse direction of the suspension bridge and multiple traction ropes. Any rotating rope extends along the length direction of the main cable. The rotation of the two rotating ropes is synchronously linked and driven by a first winch arranged on the top of the bridge tower. Multiple traction ropes connect the stiffening beam transportation and lifting device with the two rotating ropes.

[0012] Preferably, a pair of traction cable tugs are symmetrically provided on both sides of any load-bearing cable supporting beam spaced apart in the transverse direction of the suspension bridge, and any pair of traction cable tugs are respectively fixed on the upper surface of the corresponding load-bearing cable supporting beam and the lower surface of the corresponding load-bearing cable supporting beam, and a pair of traction cable tugs is corresponding to one rotating rope, and one side of any rotating rope passes through all the traction cable tugs located on the upper surface of the load-bearing cable supporting beam, and the other side passes through all the traction cable tugs located on the lower surface of the load-bearing cable supporting beam.

[0013] Preferably, the traveling load-bearing cable mechanism comprises two rope groups respectively located on both sides of the load-bearing cable supporting beam and spaced apart along the transverse direction of the suspension bridge, any rope group comprises a plurality of ropes spaced apart along the transverse direction of the suspension bridge, any rope extends along the length direction of the main cable, and its two ends are respectively connected to the anchoring systems of the bridge towers on both sides, and the rope is fixedly connected to the upper surfaces of all the load-bearing cable supporting beams.

[0014] Preferably, the stiffening beam transportation and lifting device comprises:

[0015] A pair of C-type sports cars are arranged at intervals along the length direction of the main cable. A plurality of rollers are arranged on the top of any C-type sports car, one roller is arranged corresponding to one rope, and the bottom of any roller is slidably connected to the top of the corresponding rope;

[0016] Two lifting mechanisms, one lifting mechanism is provided for each C-type sports car, and any lifting mechanism comprises two upper hangers, both upper ends of which are fixedly connected to the bottom of the corresponding C-type sports car, two lower hangers, two lifting steel ropes, and a second winch for driving the two lifting steel ropes to extend and retract upward and downward; a lower hanger and a lifting steel rope are provided correspondingly below an upper hanger, and the upper and lower ends of any lifting steel rope are respectively connected to the corresponding upper hanger and the corresponding lower hanger;

[0017] Two stiffening beam hangers are used to hang the stiffening beams to be installed. One stiffening beam hanger is correspondingly arranged for one lifting mechanism. Any stiffening beam hanger includes two vertical beams and a horizontal beam. The two vertical beams are respectively fixedly connected to the lower ends of the two corresponding lower hangers. The horizontal beam connects the lower ends of the two vertical beams. One end of the horizontal beam is hinged to one of the vertical beams, and the other end is detachably connected to the other vertical beam.

[0018] Preferably, the two C-type sports cars are connected to the two rotating ropes respectively via two traction ropes, and the two C-type sports cars are connected via a connecting rope.

[0019] Preferably, a pair of temporary slings is provided corresponding to one permanent sling of the suspension bridge, and the upper ends of any pair of temporary slings are connected to the permanent cable clamps of the corresponding permanent slings.

[0020] Preferably, any one pair of temporary slings is connected to the main cable via a temporary cable clip.

[0021] The present invention also provides a method for using a long-span suspension bridge stiffening beam erection system, comprising the following steps:

[0022] S1. Install multiple pairs of temporary slings on the main cable and arrange them evenly spaced along the length direction of the main cable. Any temporary sling is symmetrically arranged on both sides of the main cable. The upper end of any temporary sling is connected to the main cable, and the lower end extends vertically downward; the lower end of each pair of temporary slings is connected to a load-bearing cable support beam; set up a walking load-bearing cable mechanism, which extends along the length direction of the main cable, and its two ends are respectively connected to the anchoring system of the bridge towers on both sides. The walking load-bearing cable mechanism is fixedly connected to the upper surface of each load-bearing cable support beam, so that the walking load-bearing cable mechanism is kept parallel to the main cable and maintains a certain tension;

[0023] S2. Install a stiffening beam transport and lifting device, which is used to hoist the stiffening beam to be installed. The upper end of the stiffening beam transport and lifting device is slidably connected to the walking load-bearing cable mechanism, and the lower end is connected to the stiffening beam to be installed; install a traction mechanism, which includes two annular closed rotating ropes arranged at intervals in the transverse direction of the suspension bridge and a plurality of traction ropes, any rotating rope extending along the length direction of the main cable, the rotation of the two rotating ropes is synchronously linked and driven by a first winch arranged on the top of the bridge tower, and the plurality of traction ropes connect the stiffening beam transport and lifting device with the two rotating ropes;

[0024] S3, symmetrically installing stiffening beams from the middle of the main cable span to both sides, using the stiffening beam transportation lifting device to transport the stiffening beam, and then the stiffening beam transportation lifting device transports the stiffening beam to the installation position through the walking load-bearing cable mechanism, and then lifts the stiffening beam to install the stiffening beam;

[0025] Connect the stiffening beam to be installed on the side close to one of the bridge towers with the lower end of the stiffening beam transport and hoisting device, start the first winch to drive the rotating rope to rotate, and then drive the stiffening beam transport and hoisting device to move along the length direction of the main cable toward the direction close to the other bridge tower to the bottom of the installation position, the stiffening beam transport and hoisting device drives the stiffening beam to be installed to move vertically upward to the installation position, install the stiffening beam, and then disconnect the stiffening beam to be installed from the stiffening beam transport and hoisting device;

[0026] S4, using the first winch to pull the stiffening beam transport and lifting device to a side close to another bridge tower, lifting the next stiffening beam to be installed and moving it to the installation position for installation; the stiffening beams are installed symmetrically from the middle of the span of the main cable to both sides;

[0027] S5, repeat steps S3 and S4 until the entire bridge is closed;

[0028] S6. Dismantle the stiffening girder erection system of the large-span suspension bridge in the order of installation first and then dismantling, or installation later and then dismantling.

[0029] The present invention includes at least the following beneficial effects: a system for erecting stiffening beams of a large-span suspension bridge, in which temporary slings are installed on the main cables, and then the load-bearing cable support beams are installed and a traveling load-bearing cable mechanism is erected, and the main cables are used to bear the load, thereby fully saving beam erection equipment; the traction mechanism, driven by the first winch, drives the stiffening beam transport and lifting device that has obtained the stiffening beam to move from one of the bridge towers along the length direction of the traveling load-bearing cable mechanism until it reaches the installation position, and then continues to move forward to the other bridge tower to obtain the stiffening beam, thereby doubling the construction efficiency, and only one stiffening beam transport and lifting device is used to realize the symmetrical installation of the stiffening beam from the middle of the span of the main cable to both sides, thereby solving the problem of erecting stiffening beams of large-span suspension bridges when transportation is inconvenient in mountainous areas and the vertical lifting height is too large; in addition, the rotating rope of the traction mechanism is set in a ring shape and is directly installed on the load-bearing cable support beam, and is driven by the first winch, thereby avoiding the problem that the traction mechanism is directly connected to the winch and the rope coiling pressure is high.

[0030] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the main structure of the long-span suspension bridge stiffening beam erection system of the present invention;

[0032] Figure 2 It is a side structural schematic diagram of the long-span suspension bridge stiffening beam erection system of the present invention;

[0033] Figure 3The figure is a schematic diagram of the overall structure of the present invention applied in the installation process of the stiffening beam of a long-span suspension bridge. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be noted that the operating methods described in the following implementation schemes are conventional methods unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a long-span suspension bridge stiffening beam erection system, which includes:

[0037] A plurality of pairs of temporary slings 1 are evenly spaced along the length direction of the main cable 2, and any pair of temporary slings 1 is respectively arranged on both sides of the main cable 2, and the upper end of any temporary sling 1 is connected to the main cable 2, and the lower end extends vertically downward;

[0038] A plurality of load-bearing cable support beams 3, the lower ends of a pair of temporary slings 1 are connected to a load-bearing cable support beam 3;

[0039] A traveling load-bearing cable mechanism 4, which extends along the length direction of the main cable 2, and whose two ends are respectively connected to the anchoring systems of the bridge towers 5 on both sides, and the traveling load-bearing cable mechanism 4 is fixedly connected to the upper surface of each load-bearing cable support beam 3;

[0040] A stiffening beam transport and lifting device 23, which is used to hoist the stiffening beam to be installed, wherein the upper end of the stiffening beam transport and lifting device is slidably connected to the traveling load-bearing cable mechanism 4, and the lower end is connected to the stiffening beam to be installed 6;

[0041] The traction mechanism includes two annular closed rotating ropes 8 arranged at intervals in the transverse direction of the suspension bridge 7 and a plurality of traction ropes 9. Any rotating rope 8 extends along the length direction of the main cable 2. The rotation of the two rotating ropes 8 is synchronously linked and driven by the first winch arranged on the top of the bridge tower 5. The plurality of traction ropes 9 connect the stiffening beam transport and lifting device with the two rotating ropes 8.

[0042] First, install multiple pairs of temporary slings on the main cable, which can be evenly spaced with reference to the position of the permanent slings. Then connect a load-bearing cable support beam to the lower end of each pair of temporary slings. Then set up a walking load-bearing cable mechanism on the load-bearing cable support beam, and connect the two ends of the walking load-bearing cable mechanism to the anchoring system of the bridge towers on both sides. Then install the traction mechanism on the load-bearing cable support beam, and then install the stiffening beam transportation and lifting device on the walking load-bearing cable mechanism close to one of the bridge towers so that it can slide smoothly on the walking load-bearing cable mechanism. Then connect the traction mechanism with the stiffening beam transportation and lifting device. After the stiffening beam transportation and lifting device takes the stiffening beam to be installed, start the first winch, and the traction mechanism drives the stiffening beam transportation and lifting device to move horizontally in the target direction. After reaching the target position, use the stiffening beam transportation and lifting device itself to pull up the stiffening beam to be installed in the vertical direction to the installation height, and the transportation work is completed.

[0043] The large-span suspension bridge stiffening beam erection system of the present invention installs temporary slings on the main cables, and then installs the load-bearing cable support beams and erects the walking load-bearing cable mechanism, uses the main cables to bear the weight, and fully saves the beam erection equipment. The traction mechanism, driven by the first winch, drives the stiffening beam transportation and lifting device that has obtained the stiffening beam to move from one of the bridge towers along the length direction of the walking load-bearing cable mechanism until it reaches the installation position, and then it can continue to move forward to reach the other bridge tower and take the stiffening beam, which doubles the construction efficiency. Only one stiffening beam transportation and lifting device is used to realize the symmetrical installation of the stiffening beam from the span of the main cable to both sides, which solves the problem of inconvenient transportation in mountainous areas and too large vertical lifting height in erecting stiffening beams of large-span suspension bridges. In addition, since the C-type sports car has a long movement distance, the rotating rope of the traction mechanism is set to a ring shape and is directly installed on the load-bearing cable support beam, driven by the first winch, avoiding the problem of the traction mechanism being directly connected to the winch and the high rope coiling pressure in the past.

[0044] In another technical solution, Figure 2 As shown, a pair of traction rope tugs 10 are symmetrically arranged on both sides of any load-bearing cable support beam 3 arranged in a spaced manner in the transverse direction of the suspension bridge 7, and any pair of traction rope tugs 10 are respectively fixed on the upper surface of the corresponding load-bearing cable support beam 3 and the lower surface of the corresponding load-bearing cable support beam 3. A pair of traction rope tugs 10 are correspondingly arranged for one rotating rope 8, and one side of any rotating rope 8 passes through all the traction rope tugs 10 located on the upper surface of the load-bearing cable support beam 3, and the other side passes through all the traction rope tugs 10 located on the lower surface of the load-bearing cable support beam 3. The rotating ropes on the corresponding sides are supported by the two pairs of traction rope tugs respectively, and will not interfere with the permanent slings or other devices of the main cable itself.

[0045] In another technical solution, Figure 1 and Figure 2As shown, the traveling load-bearing cable mechanism 4 includes two rope groups respectively located on both sides of the load-bearing cable support beam 3 and arranged at intervals in the transverse direction of the suspension bridge 7. Any rope group includes a plurality of ropes arranged at intervals in the transverse direction of the suspension bridge. Any rope extends along the length direction of the main cable, and its two ends are respectively connected to the anchoring systems of the bridge towers on both sides, and the rope is fixedly connected to the upper surface of all the load-bearing cable support beams 3. Each rope group includes a plurality of ropes, which evenly bear the weight of the stiffening beam, and also make the stiffening beam transportation and lifting device more stable during the walking process and not easy to shake.

[0046] In another technical solution, Figure 1 and Figure 2 As shown, the stiffening beam transportation and lifting device comprises:

[0047] A pair of C-type sports cars 11 are arranged at intervals along the length direction of the main cable 2. A plurality of rollers 12 are arranged on the top of any C-type sports car 11. One roller is arranged corresponding to one rope. The bottom of any roller is slidably connected to the top of the corresponding rope; two lifting mechanisms, one lifting mechanism is arranged corresponding to one C-type sports car 11. Any lifting mechanism includes two upper hangers 13 whose upper ends are fixedly connected to the bottom of the corresponding C-type sports car 11, two lower hangers 14, two lifting steel wire ropes 15, and a second winch for driving the two lifting steel wire ropes 15 to extend and retract upward and downward; a lower hanger 14 and a lifting steel wire rope 15 are arranged correspondingly below an upper hanger 13. The upper and lower ends of any lifting steel wire rope 15 are respectively connected to the corresponding upper hanger 13 and the corresponding lower hanger 14;

[0048] Two stiffening beam hangers 16 are used to hang the stiffening beam 6 to be installed. One lifting mechanism corresponds to one stiffening beam hanger 16. Any stiffening beam hanger 16 includes two vertical beams 17 and a horizontal beam 18. The two vertical beams 17 are respectively fixedly connected to the lower ends of the two corresponding lower hangers 14. The horizontal beam 18 connects the lower ends of the two vertical beams 17. One end of the horizontal beam 18 is hinged to one of the vertical beams 17, and the other end is detachably connected to the other vertical beam 17.

[0049] Any lifting wire rope is pulled out from the second winch installed at one of the bridge towers, passed through the upper and lower brackets of a C-type sports car, and then pulled to the other bridge tower for anchoring. When taking the stiffening beam, first use the second winch to release the wire rope, and the lower bracket descends until the vertical beam reaches the horizontal position of the stiffening beam. Remove the crossbeam at the bottom of the stiffening beam hanger, let the stiffening beam pass between the two vertical beams, and then insert the crossbeam to hold the stiffening beam. Then use the rollers of the C-type sports car to slide on the corresponding ropes to transport the stiffening beam to the specified position in the horizontal direction. Then use the second winch to rewind the lifting wire rope to shrink the length of the lifting wire rope on the C-type sports car to lift the stiffening beam to the specified position in the vertical direction, and then install the stiffening beam. Setting up a pair of C-type sports cars is conducive to evenly distributing the weight of the stiffening beam on the walking load-bearing cable mechanism, and is also conducive to maintaining balance during the transportation of the stiffening beam. The bottom crossbeam of the stiffening beam hoist is designed to be detachable. It is closed when the stiffening beam is hoisted to hold the stiffening beam. After installation, the crossbeam is opened so that the stiffening beam transportation and lifting device can return smoothly when empty and is not affected by the stiffening beam. The C-type sports car straddles the steel wire rope of the walking load-bearing cable and can avoid the permanent sling when walking. The C-type sports car uses the principle of levers for multi-level distribution, which can lengthen the sports car, increase the number of rollers, and evenly distribute the weight of the stiffening beam on each roller.

[0050] In another technical solution, Figure 1 and Figure 2 As shown, two C-type sports cars 11 are connected to two rotating ropes 8 through two traction ropes 9, respectively, and the two C-type sports cars 11 are connected through a connecting rope 19. The first winch drives the rotating rope to rotate clockwise or counterclockwise, and the rotating rope first drives and pulls one of the traction ropes, which pulls the corresponding first C-type sports car, and then pulls the next C-type sports car through the connecting rope between the sports cars, and the next C-type sports car then pulls the corresponding traction rope, thereby forming a circular motion system, and synchronously driving the two C-type sports cars to move.

[0051] In another technical solution, Figure 2 As shown, a pair of temporary slings 1 is arranged corresponding to a permanent sling 20 of the suspension bridge, and the upper ends of any pair of temporary slings 1 are connected to the permanent cable clamps 21 of the corresponding permanent slings 20. The permanent cable clamps are components that bear the transport load of the entire stiffening beam. The temporary slings can be fixed on the permanent cable clamps by means of grooves, etc. Two temporary slings are arranged under each permanent locking clamp and connected to the load-bearing cable support beam, so that the load-bearing cable support beam can be adaptively rotated when a sports car passes by, and the lengths of the two temporary slings are consistent, so that the connection line of the load-bearing cable support beam is parallel to the main cable axis.

[0052] In another technical solution, Figure 1As shown, any pair of temporary slings 1 is connected to the main cable 2 through a temporary cable clamp 22. The temporary cable clamp is arranged close to the top of the permanent cable clamp to prevent the temporary cable clamp from sliding down. Two temporary slings are arranged under each temporary cable clamp and connected to the load-bearing cable support beam, so that the load-bearing cable support beam can be adaptively rotated when the sports car passes by, and the lengths of the two temporary slings are consistent, so that the connection line of the load-bearing cable support beam is parallel to the main cable axis.

[0053] The present invention also provides a method for using a long-span suspension bridge stiffening beam erection system, comprising the following steps:

[0054] S1. Install multiple pairs of temporary slings on the main cable and arrange them evenly spaced along the length direction of the main cable. Any temporary sling is symmetrically arranged on both sides of the main cable. The upper end of any temporary sling is connected to the main cable, and the lower end extends vertically downward; the lower end of each pair of temporary slings is connected to a load-bearing cable support beam; set up a walking load-bearing cable mechanism, which extends along the length direction of the main cable, and its two ends are respectively connected to the anchoring system of the bridge towers on both sides. The walking load-bearing cable mechanism is fixedly connected to the upper surface of each load-bearing cable support beam, so that the walking load-bearing cable mechanism is kept parallel to the main cable and maintains a certain tension;

[0055] When constructing a suspension bridge, a catwalk is first set up along the length of the main cable at a certain distance below the main cable installation position to facilitate construction workers. The installation of the stiffening beam is completed below the catwalk. Therefore, when installing temporary slings from the main cable, the length of the temporary slings, the height of the load-bearing cable support beam, and the height of the traveling load-bearing cable mechanism should be determined in combination with the catwalk position, the distance between the mid-span steel truss and the main cable, and the height of the stiffening beam transportation and lifting device. The traveling load-bearing cable mechanism should also maintain the tension and line shape required for construction. Suspension bridges are generally symmetrically arranged with two main cables. Therefore, the same steps are taken on the two main cables to install the large-span suspension bridge stiffening beam erection system, and stiffening beams are installed at the bottom of both sides of the suspension bridge along its transverse direction to ensure the synchronous lifting construction of the stiffening beams.

[0056] S2. Install a stiffening beam transport and lifting device, which is used to hoist the stiffening beam to be installed. The upper end of the stiffening beam transport and lifting device is slidably connected to the walking load-bearing cable mechanism, and the lower end is connected to the stiffening beam to be installed; install a traction mechanism, which includes two annular closed rotating ropes arranged at intervals in the transverse direction of the suspension bridge and a plurality of traction ropes, any rotating rope extending along the length direction of the main cable, the rotation of the two rotating ropes is synchronously linked and driven by a first winch arranged on the top of the bridge tower, and the plurality of traction ropes connect the stiffening beam transport and lifting device with the two rotating ropes;

[0057] S3, symmetrically installing stiffening beams from the middle of the main cable span to both sides, using the stiffening beam transportation lifting device to transport the stiffening beam, and then the stiffening beam transportation lifting device transports the stiffening beam to the installation position through the walking load-bearing cable mechanism, and then lifts the stiffening beam to install the stiffening beam;

[0058] Connect the stiffening beam to be installed on the side close to one of the bridge towers with the lower end of the stiffening beam transport and lifting device, start the first winch to drive the rotating rope to rotate, and then drive the stiffening beam transport and lifting device to move along the length direction of the main cable toward the direction close to the other bridge tower to the bottom of the installation position, the stiffening beam transport and lifting device drives the stiffening beam to be installed to move vertically upward to the installation position, install the stiffening beam, and then disconnect the stiffening beam to be installed from the stiffening beam transport and lifting device.

[0059] S4, using the first winch to pull the stiffening beam transport and lifting device to a side close to another bridge tower, lifting the next stiffening beam to be installed and moving it to the installation position for installation; the stiffening beams are installed symmetrically from the middle of the span of the main cable to both sides;

[0060] S5, repeat steps S3 and S4 until the entire bridge is closed;

[0061] S6. Dismantle the stiffening girder erection system of the large-span suspension bridge in the order of installation first and then dismantling, or installation later and then dismantling.

[0062] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A long-span suspension bridge stiffening beam erection system, characterized in that: It includes: A plurality of pairs of temporary slings are evenly spaced along the length direction of the main cable, and any pair of temporary slings are respectively arranged on both sides of the main cable, and the upper end of any temporary sling is connected to the main cable, and the lower end extends vertically downward; A plurality of load-bearing cable support beams, wherein the lower ends of a pair of temporary slings are connected to a load-bearing cable support beam; A traveling load-bearing cable mechanism, which extends along the length direction of the main cable, and whose two ends are respectively connected to the anchoring systems of the bridge towers on both sides, and the traveling load-bearing cable mechanism is fixedly connected to the upper surface of each load-bearing cable support beam; A stiffening beam transport and lifting device, which is used to hoist the stiffening beam to be installed, wherein the upper end of the stiffening beam transport and lifting device is slidably connected to the traveling load-bearing cable mechanism, and the lower end is connected to the stiffening beam to be installed; A traction mechanism, comprising two annular closed rotating ropes arranged at intervals in the transverse direction of the suspension bridge and a plurality of traction ropes, wherein any rotating rope extends in the length direction of the main cable, the two rotating ropes rotate synchronously and are driven by a first winch arranged on the top of the bridge tower, and the plurality of traction ropes connect the stiffening beam transport and lifting device with the two rotating ropes; A pair of traction rope tugs are symmetrically arranged on both sides of any load-bearing cable support beam arranged at intervals in the transverse direction of the suspension bridge, and any pair of traction rope tugs are respectively fixed on the upper surface of the corresponding load-bearing cable support beam and the lower surface of the corresponding load-bearing cable support beam, and a pair of traction rope tugs are corresponding to one rotating rope, and one side of any rotating rope passes through all the traction rope tugs located on the upper surface of the load-bearing cable support beam, and the other side passes through all the traction rope tugs located on the lower surface of the load-bearing cable support beam; The traveling load-bearing cable mechanism comprises two rope groups respectively located on both sides of the load-bearing cable support beam spaced apart in the transverse direction of the suspension bridge, each rope group comprises a plurality of ropes spaced apart in the transverse direction of the suspension bridge, each rope extends along the length direction of the main cable, and both ends of each rope are respectively connected to the anchoring systems of the bridge towers on both sides, and the rope is fixedly connected to the upper surfaces of all the load-bearing cable support beams; The stiffening beam transportation and lifting device comprises: A pair of C-type sports cars are arranged at intervals along the length direction of the main cable. A plurality of rollers are arranged on the top of any C-type sports car, one roller is arranged corresponding to one rope, and the bottom of any roller is slidably connected to the top of the corresponding rope; Two lifting mechanisms, one lifting mechanism is provided for each C-type sports car, and any lifting mechanism comprises two upper hangers, both upper ends of which are fixedly connected to the bottom of the corresponding C-type sports car, two lower hangers, two lifting steel ropes, and a second winch for driving the two lifting steel ropes to extend and retract upward and downward; a lower hanger and a lifting steel rope are provided correspondingly below an upper hanger, and the upper and lower ends of any lifting steel rope are respectively connected to the corresponding upper hanger and the corresponding lower hanger; Two stiffening beam hangers, which are used to hang the stiffening beams to be installed. One stiffening beam hanger is correspondingly provided for one lifting mechanism. Any stiffening beam hanger comprises two vertical beams and a horizontal beam. The two vertical beams are respectively fixedly connected to the lower ends of the two corresponding lower hangers. The horizontal beam connects the lower ends of the two vertical beams. One end of the horizontal beam is hinged to one of the vertical beams, and the other end is detachably connected to the other vertical beam. A pair of temporary slings is arranged corresponding to a permanent sling of a suspension bridge. The upper ends of any pair of temporary slings are connected to the permanent cable clamps of the corresponding permanent slings, and the temporary slings are fixed by grooves on the permanent cable clamps.

2. The long-span suspension bridge stiffening girder erection system according to claim 1, characterized in that: The two C-type sports cars are respectively connected with the two rotating ropes through two traction ropes, and the two C-type sports cars are connected with each other through a connecting rope.

3. The long-span suspension bridge stiffening girder erection system according to claim 1 or 2, characterized in that: Any pair of temporary slings is connected to the main cable through a temporary cable clamp.

4. The method for using the long-span suspension bridge stiffening girder erection system according to claim 1, characterized in that: The following steps are involved: S1. Install multiple pairs of temporary slings on the main cable and arrange them evenly spaced along the length direction of the main cable. Any temporary sling is symmetrically arranged on both sides of the main cable. The upper end of any temporary sling is connected to the main cable, and the lower end extends vertically downward; the lower end of each pair of temporary slings is connected to a load-bearing cable support beam; set up a walking load-bearing cable mechanism, which extends along the length direction of the main cable, and its two ends are respectively connected to the anchoring system of the bridge towers on both sides. The walking load-bearing cable mechanism is fixedly connected to the upper surface of each load-bearing cable support beam, so that the walking load-bearing cable mechanism is kept parallel to the main cable and maintains a certain tension; S2. Install a stiffening beam transport and lifting device, which is used to hoist the stiffening beam to be installed. The upper end of the stiffening beam transport and lifting device is slidably connected to the walking load-bearing cable mechanism, and the lower end is connected to the stiffening beam to be installed; install a traction mechanism, which includes two annular closed rotating ropes arranged at intervals in the transverse direction of the suspension bridge and a plurality of traction ropes, any rotating rope extending along the length direction of the main cable, the rotation of the two rotating ropes is synchronously linked and driven by a first winch arranged on the top of the bridge tower, and the plurality of traction ropes connect the stiffening beam transport and lifting device with the two rotating ropes; S3, symmetrically installing stiffening beams from the middle of the main cable span to both sides, using the stiffening beam transportation lifting device to transport the stiffening beam, and then the stiffening beam transportation lifting device transports the stiffening beam to the installation position through the walking load-bearing cable mechanism, and then lifts the stiffening beam to install the stiffening beam; Connect the stiffening beam to be installed on the side close to one of the bridge towers with the lower end of the stiffening beam transport and hoisting device, start the first winch to drive the rotating rope to rotate, and then drive the stiffening beam transport and hoisting device to move along the length direction of the main cable toward the direction close to the other bridge tower to the bottom of the installation position, the stiffening beam transport and hoisting device drives the stiffening beam to be installed to move vertically upward to the installation position, install the stiffening beam, and then disconnect the stiffening beam to be installed from the stiffening beam transport and hoisting device; S4, using the first winch to pull the stiffening beam transport and lifting device to a side close to another bridge tower, lifting the next stiffening beam to be installed and moving it to the installation position for installation; the stiffening beams are installed symmetrically from the middle of the span of the main cable to both sides; S5, repeat steps S3 and S4 until the entire bridge is closed; S6. Dismantle the stiffening girder erection system of the large-span suspension bridge in the order of installation first and then dismantling, or installation later and then dismantling.

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