Suspension bridge steel truss girder erecting system and erecting method

Abstract

The application discloses a suspension bridge steel truss erection system and method, relates to the bridge construction technical field, and comprises a tower crane support, two ends of the tower crane support extend to two sides along the longitudinal bridge direction, and one of the extending ends is provided with a pulley mechanism; a walking device comprises a through jack, a walking box body and a plurality of steel strands; a traction device comprises a winch and a plurality of steel wires; when the steel truss is hoisted to a set height by the winch through the steel wires, the steel truss is fixed to the steel strands of the walking device from the steel wires of the traction device. The erection system and method can be applied to large-span suspension bridges, and the requirements for the terrain and the channel transportation conditions are low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge construction, in particular to a system and method for erecting a steel truss girder of a suspension bridge. BACKGROUND

[0002] Currently, the main methods for erecting a steel truss girder of a suspension bridge are the cable crane method and the cable load crane method. When a suspension bridge is built across a river or a sea area, the stiffening girder is generally transported to the bridge site by a ship and then erected vertically by a cable load crane. When a suspension bridge is built across a valley in a mountainous area, the transportation conditions are poor due to the steep terrain on both sides of the valley, and the construction site is narrow. In addition, the river at the bridge site is shallow and narrow, and cannot be navigated. Therefore, the steel truss girder is mainly erected by the cable crane method.

[0003] In the related art, the cable crane method uses the main towers of the suspension bridge and the terrain on both sides of the valley to set up a cable crane system composed of anchorages, towers, bearing cables, trolleys and traction systems. The trolleys are hung on the bearing cables, and the trolleys themselves are not powered and need the traction system on both sides of the bearing cables to provide traction. As the span of the suspension bridge increases, the construction cost of the cable crane method increases significantly, and the safety of the construction decreases significantly. Therefore, the cable crane method is not economical for the construction of a suspension bridge with a main span of more than 900 m.

[0004] The cable load crane method sets a crane on the main cable, vertically lifts the steel truss girder to the design elevation by the lifting system on the crane, then installs the suspender, and completes the erection of a single segment of the steel truss girder. The cable load crane travels along the main cable and does not need to set additional bearing cables. In addition, the crane itself has a power system. When the erection of a segment of the steel truss girder is completed, the crane can travel to the position where the next segment of the steel truss girder is to be erected by the power system, and then erect the next segment of the steel truss girder. The cable load crane method can be used for the construction of a suspension bridge with a main span of more than 900 m. However, the cable load crane method generally transports the segments of the steel truss girder to the bridge site by a ship, and then vertically lifts the segments by the cable load crane. Therefore, it is generally required that the area below the main cable is a water area or a flat terrain, which has high requirements for the terrain and the transportation conditions of the waterway. However, when the main span of the suspension bridge is more than 900 m and the area below the main cable is not a water area or a flat terrain, there is currently no method for erecting the steel truss girder of the suspension bridge.

[0005] Therefore, there is an urgent need for a new erection method that can be used for a large-span suspension bridge and has low requirements for the terrain and the transportation conditions of the waterway. SUMMARY

[0006] In view of the defects in the prior art, the purpose of the present application is to provide a suspension bridge steel truss erection system and method, which can be applied to large-span suspension bridges and has low requirements for terrain and channel transportation conditions.

[0007] To achieve the above purpose, the technical scheme adopted is: a suspension bridge steel truss erection system, comprising: a hanging device, which comprises a tower crane support, the tower crane support is arranged at the top end of the main tower of the suspension bridge, and the two ends of the tower crane support extend to both sides along the longitudinal direction of the bridge, and one of the extending ends is provided with a pulley mechanism;

[0008] A walking device, which comprises a through-jack, a walking box body and a plurality of steel strands, the bottom surface of the walking box body is provided with a plurality of walking wheels for walking along the main cable of the suspension bridge, and the through-jack is vertically fixed to the top surface of the through-jack; the steel strands pass through the through-jack;

[0009] A traction device, which comprises a winch and a plurality of steel wires, the winch is fixed to the tower crane support; a part of the steel wires is used for lifting the steel truss and is connected to the winch through the pulley structure at the side end of the tower crane support; another part of the steel wires is connected to the walking box body and the winch;

[0010] When the steel truss is lifted to a set height by the winch through the steel wires, the steel truss is fixed to the steel strands of the walking device instead of the steel wires of the traction device.

[0011] On the basis of the above technical scheme, the erection system further comprises a track, the bottom surface of the track is fixed to the main cable, and the walking wheels are slidably installed on the top surface of the track; the track comprises a plurality of rail segment units;

[0012] During the walking process of the walking device along the track with the steel truss from the position adjacent to the main tower to a remote position, the rail segment units behind the walking device are removed and installed in front of the walking device.

[0013] On the basis of the above technical scheme, the erection system further comprises a plurality of temporary clamps in the shape of a claw and detachable, the temporary clamps are arranged on the bottom surface of the track, and the temporary clamps are used for clamping the main cable; one temporary clamp is arranged at a set interval on the track.

[0014] On the basis of the above technical scheme, the erection system further comprises a catwalk platform, the catwalk platform is arranged in parallel below the main cable, and the catwalk platform is used for carrying workers and tool parts required by the lifting and walking system.

[0015] On the basis of the above technical scheme, the erection system further comprises a traction cable assembly, the traction cable assembly is tensioned above the main cable, and the traction cable assembly is used for transporting a boom.

[0016] The application also discloses a construction method of the construction system of the steel truss girder of the suspension bridge.

[0017] S1: installing a tower crane support at the top end of a main tower of the suspension bridge, and installing a pulley mechanism at one of the extending ends of the tower crane support; installing a walking device on a main cable adjacent to the main tower; installing winches of traction devices at the top end of the main tower on both sides of the steel truss girder to be installed, and fixing the two winches to both ends of the walking box body through steel wires;

[0018] S2: moving the steel truss girder to a lifting point on the ground, and lifting and transporting the steel truss girder to a set elevation through the steel wires and the pulley mechanism;

[0019] S3: fixing the steel truss girder to the bottom end of the steel strand, and removing the steel wires on the steel truss girder;

[0020] S4: starting the winches on both sides of the steel truss girder to be installed, and moving the steel truss girder along the longitudinal bridge to a design position in the middle of the bridge through the walking device; meanwhile, transporting a boom corresponding to the steel truss girder to the design position in the middle of the bridge; installing the boom, and fixing the steel truss girder from the steel strand to the boom.

[0021] On the basis of the above technical scheme, the construction system further comprises a track, the bottom surface of the track is fixed to the main cable, and the walking wheels are slidably installed on the top surface of the track; the track comprises a plurality of track segment units.

[0022] In step S1, the track is laid along the main cable, and the walking wheels below the walking box body are slidably arranged on the track.

[0023] In step S4, during the walking of the walking device with the steel truss girder along the track, the track segment units behind the walking device are removed and installed in front of the walking device.

[0024] On the basis of the above technical scheme, the construction system further comprises a plurality of temporary clamps in the shape of a claw and detachable, the temporary clamps are arranged on the bottom surface of the track, and the temporary clamps are used for clamping the main cable; one temporary clamp is arranged at a set interval on the track.

[0025] On the basis of the above technical scheme, the construction system further comprises a catwalk platform, the catwalk platform is arranged in parallel below the main cable, and the catwalk platform is used for bearing workers and tool parts required by the hoisting and transporting walking system; the construction system further comprises a traction cable assembly, the traction cable assembly is tensioned above the main cable, and the traction cable assembly is used for transporting the boom.

[0026] In step S1, the track segment units, the temporary clamps and the cable clamp of the track are transported and installed through the catwalk platform.

[0027] In step S4, the transportation and installation of all the hangers are completed by the traction cable assembly.

[0028] The technical scheme provided by the present application has the beneficial effects of:

[0029] The erection system and method of the steel truss girder of the suspension bridge provided by the present application uses the main cable as a walking channel, does not have an automatic force device itself, and uses a winch and a steel wire rope to provide power for walking movement; compared with the cable crane method, the present application does not need to increase a plurality of bearing cables, is suitable for large-span suspension bridges, and is economical; the walking device of the erection system has the ability to walk with the steel truss girder, first uses a traction device and a hanging device to hoist the steel truss girder to a set elevation, and then is fixed to the steel strand of the walking device, so that the steel truss girder is fixed to the walking device through the steel strand, and the steel truss girder is hoisted from the position adjacent to the main tower upward all the time, and there is no requirement for the terrain and the waterway below the main cable, and the requirement for the terrain and the waterway transportation conditions is low.

[0030] The reason why the cable car of the cable crane method of the prior art can only walk empty and the present application can walk with the steel truss girder is that, first, the ascending process of the present application is realized by the hanging device in cooperation with the traction device, and the walking device is only responsible for walking; and the walking device is not provided with an automatic force device, which greatly reduces the weight and makes the center of gravity of the steel truss girder lower, so that the walking device is more safe and stable; second, a track special for the walking device is laid, the special track can perfectly match the walking wheels of the walking box body, has superior stress and good walking performance; at the same time, the track is arranged in sections, and is laid while being disassembled and removed, which greatly saves the cost of the track and is economical. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 The vertical lifting facade diagram of the steel truss girder of the suspension bridge provided by the present application is shown in the figure;

[0033] Figure 2 The longitudinal bridge transportation facade diagram of the steel truss girder of the suspension bridge provided by the present application is shown in the figure;

[0034] Figure 3 The diagram of the suspension bridge provided by the present application is shown in the figure;

[0035] Figure 4 The catwalk platform and the traction cable assembly of the steel truss girder of the suspension bridge provided by the present application are shown in the figure;

[0036] Figure 5 The hoisting schematic view of the closure section of the suspension bridge provided by the embodiment of the present application;

[0037] Reference signs:

[0038] 1, tower crane support; 2, traveling device; 3, track; 4, traction device; 5, temporary holder; 6, main cable; 7, catwalk platform; 8, traction cable assembly; 9, main tower; 10, steel truss beam; 11, boom; 21, through jack; 22, traveling box; 23, traveling wheel; 24, steel strand; 42, winch; 41, steel wire rope; 74, panel layer; 73, handrail cable; 72, protection cable; 71, load-bearing cable; 8, traction cable assembly; 81, gantry load-bearing cable; 82, gantry traction cable. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0040] As shown in Figure 1 , Figure 2 and Figure 3 , the present application discloses an embodiment of a steel truss beam erection system of a suspension bridge, which can be applied to a long-span suspension bridge and has low requirements for terrain and channel transportation conditions; compared with the cable crane method which needs to install a large number of load-bearing cables, the load-bearing main body of the erection system of the present application still uses the main cable 6; compared with the cable crane method which is self-powered and walks, the erection system of the present application has no powered walking equipment; the cable crane method can only walk empty and vertically upward, and has high requirements for the terrain and channel transportation conditions under the bridge; the erection system of the present application can walk with the steel truss beam segment, and has low requirements for the terrain and channel transportation conditions under the bridge.

[0041] The erection system includes a hoisting device, a traveling device 2 and a traction device 4, the hoisting device includes a tower crane support 1, the tower crane support 1 is arranged at the top end of the main tower 9 of the suspension bridge, and the two ends of the tower crane support 1 extend to both sides along the longitudinal direction of the bridge, and one of the extending ends is provided with a pulley mechanism.

[0042] The traveling device 2 comprises a through jack 21, a traveling box 22 and a plurality of steel strands 24, the bottom surface of the traveling box 22 is provided with a plurality of traveling wheels 23 for traveling along the main cable 6 of the suspension bridge. The through jack 21 is vertically fixed to the top surface of the through jack 21, and during the traveling of the traveling wheels 23, the through jack 21 is adjusted accordingly, but always maintains a vertical state. The steel strands 24 pass through the through jack 21 and are used to connect the steel truss girder. After the steel truss girder is first hung to the designed elevation via the hanging device, it is then fixed to the bottom end of the steel strands 24, and the weight of the steel truss girder is transferred to the traveling device 2.

[0043] The traction device 4 comprises a winch 42 and a plurality of steel wires 41, the winch 42 is fixed to the tower crane support 1; a part of the steel wires 41 is used to hoist the steel truss girder 10, one end of the part of the steel wires 41 is connected to the steel wires 41, and the other end passes through the pulley structure at the side end of the tower crane support 1 and extends downward, and the winch 42 hoists the steel truss girder 10 through the part of the steel wires 41. Another part of the steel wires 41 connects the traveling box 22 and the winch 42, specifically, one end of the part of the steel wires 41 is connected to the winch 42, and the other end is connected to the end of the traveling box 22, and the winch 42 moves the traveling box 22 through the part of the steel wires.

[0044] Specifically, when erecting the steel truss girder between the two main towers 9, the traction device 4 is arranged with the winch 42 and the plurality of steel wires 41 at both of the main towers 9, and the winches 42 of the two main towers 9 pull the traveling box 22 to move empty or the traveling box 22 moves together with the steel truss girder through the steel wires 41.

[0045] When the steel truss girder 10 is hoisted to the designed elevation by the winch 42 through the steel wires 41, the steel truss girder 10 is transferred from the steel wires 41 of the traction device 4 to the steel strands 24 of the traveling device 2.

[0046] The suspension bridge steel truss girder erection system of the present application travels on the main cable 6, and the traveling device 2 itself does not have an automatic force device, and the winch 42 and the steel wires 41 are used to provide power for the traveling movement;

[0047] The erection system of the present application still uses the main cable 6 as a walking path, does not need to increase a number of load-bearing cables relative to the cable crane method, is suitable for long-span suspension bridges, and is economical; the walking device 2 of the erection system of the present application has the ability to walk with a steel truss, first uses the traction device 4 and the hanging device to hoist the steel truss 10 to a set elevation, and then is fixed to the steel strand 24 of the walking device 2, so that the steel truss is fixed to the walking device 2 through the steel strand 24, and the steel truss 10 is hoisted from the position adjacent to the main tower upward all the time, without requirements for the terrain and the waterway at other positions below the main cable. One of the main reasons why the cable car of the cable crane method of the prior art can only walk empty is that the erection system of the present application can walk with the steel truss, which is mainly due to the fact that the ascending process of the present application is realized by the hanging device matched with the traction device 4, and the walking device 2 is only responsible for walking; and the walking device 2 is not provided with automatic force equipment, greatly reducing the weight, and the center of gravity is biased to the steel truss, which is more safe and stable.

[0048] In one embodiment, the erection system further comprises a track 3, the bottom surface of the track 3 is fixed to the main cable 6 of the suspension bridge, and the walking wheel 23 is slidably installed on the top surface of the track 3. The track 3 comprises a plurality of track segment units; during the walking process of the walking device 2 with the steel truss 10 along the track 3 from the position adjacent to the main tower 9 to the distance, the track 3 is laid while walking, and the track segment units behind the walking device 2 (behind in the walking direction) are removed while being installed to the front of the walking device 2 (in front in the walking direction). Specifically, the length of the track 3 is only slightly greater than the length of the walking box body 22. Preferably, the length of the track 3 is twice the length of the walking box body 22.

[0049] The erection system of the present application breaks through the cable car of the cable crane method of the prior art which can only walk empty, and enables the walking device 2 to walk with the steel truss, which is mainly due to the fact that the erection system of the present application lays the track 3 special for the walking device 2, the special track 3 can perfectly match the walking wheel 23 of the walking box body 22, has superior stress and good walking performance; at the same time, the track 3 is provided in a segmented manner, and is laid while walking and removed, greatly saving the cost of the track 3 and being economical.

[0050] Further, the erection system further comprises a temporary clamp 5 in the shape of a dog claw, the temporary clamp 5 is fixed to the track bottom surface, and is used for clamping the main cable 6. The temporary clamp 5 is detachable. Under the premise of avoiding the cable clamp on the main cable, one temporary clamp 5 is provided every set interval of the track 3. The set interval is determined according to the strength and rigidity of the track 3.

[0051] Preferably, the bottom surface of each track segment unit is provided with at least one detachable temporary clamp 5.

[0052] In one embodiment, the erection system further comprises a catwalk platform 7, which is arranged in parallel below the main cable 6, and is used to carry workers and tool parts required by the hoisting and walking system. Specifically, the track 3, the temporary clamps 5, the cable clamps, and the like are installed by taking the catwalk platform 7 as a working platform.

[0053] Further, the catwalk platform 7 further comprises a panel layer 74, a handrail cable 73, a protective cable 72, and a bearing cable 71; the bearing cables 71 are arranged in a plane parallel to the main cable 6, the panel layer 74 is arranged on the top surface of all the bearing cables 71 to form a construction platform. The panel layer 74 is provided with a strip-shaped hole for avoiding interference with the steel strand. During the installation of the track 3, the temporary clamps 5, the cable clamps, and the like on the catwalk platform 7, a wooden board or the like is arranged in the strip-shaped hole of the panel layer 74, and the wooden board or the like is removed during the walking of the walking device 2 with the steel truss. The handrail cable 73 and the protective cable 72 are arranged on both sides of the panel layer 74, and function as a protective fence to avoid accidents of the construction personnel and improve the safety performance.

[0054] As shown in FIG. 1, Figure 4 In one embodiment, the erection system further comprises a traction cable assembly 8, which is arranged above the main cable 6, and is used to transport the suspender 11.

[0055] Specifically, the traction cable assembly 8 comprises two gantry bearing cables 81 and two gantry traction cables 82. Specifically, when the walking device 2 walks with the steel truss to a designated position, the traction cable assembly 8 transports the suspender 11, fixes the top end of the suspender 11 to the cable clamp on the main cable, fixes the bottom end of the suspender 11 to the steel truss, and then releases the bottom end of the steel strand from the steel truss, so as to convert the weight of the steel truss to the suspender 11.

[0056] As shown in FIG. 1, Figure 1 , Figure 2 , Figure 3 and Figure 5 The present application further discloses an embodiment of an erection method based on the above-mentioned erection system of the steel truss of the suspension bridge, which comprises the following steps:

[0057] S1: installing the tower crane support 1 at the top end of the main tower 9 of the suspension bridge, and installing a pulley mechanism at one of the extending ends of the tower crane support 1; installing the walking device 2 on the main cable 6 adjacent to the main tower 9; installing the traction device 4 at the top end of the main tower on both sides of the steel truss 10 to be installed, and fixing the two winches 42 of the traction device 4 at the two ends of the walking box body 22 through the steel wire rope 41, so as to achieve the purpose of longitudinal walking of the walking box body 22.

[0058] S2: moving the steel truss 10 to the hoisting point on the ground, that is, below the main cable adjacent to the main tower 9. The winch 42 hoists the steel truss 10 to a designated elevation through the steel wire rope 41 and the pulley mechanism of the tower crane support 1.

[0059] S3: Fix the steel truss 10 to the bottom end of the steel strand 24 of the walking device 2, and remove the steel wire rope 41 on the steel truss 10; at this time, the steel truss 10 is supported from the steel wire rope 41 of the traction device 4, and is changed to be supported by the steel strand 24 of the walking device 2.

[0060] S4: Start the winch 42 on both sides, and move the walking device 2 to the midspan design position along the longitudinal bridge; at the same time, transport the boom 11 to the midspan design position; install the boom 11, gradually lower the steel truss 10 through the steel strand 24, and fix the steel truss 10 from the steel strand 24 to the boom 11, that is, complete the erection of the steel truss, and only need to connect the two steel trusses to complete the work.

[0061] The application utilizes the erection system of the steel truss of the suspension bridge to perform the erection method of the steel truss, which is different from the conventional cable crane method and the cable load crane method, discloses a new erection method of the steel truss of the suspension bridge, can be applied to the large-span suspension bridge, and has low requirements for the terrain and the transportation conditions of the channel; the erection method of the application first installs the walking device 2 on the main cable 6, utilizes the traction device 4 to first complete the lifting work of the steel truss, then transfers the steel truss to the steel strand 24 of the walking device 2, then uses the steel strand to walk with the steel truss 10 to the midspan, until reaching the midspan design position, and then transfers the steel truss 10 to the boom 11 to complete the erection work.

[0062] The erection method of the application still uses the main cable 6 as the walking channel, does not need to increase a plurality of bearing cables relative to the cable crane method, is suitable for the large-span suspension bridge, and is good in economy; the erection system of the application has the walking device 2 with the ability of walking with the steel truss, first uses the traction device 4 and the hanging device to hoist the steel truss 10 to the set elevation, and then fixes the steel truss to the steel strand 24 of the walking device 2, so that the steel truss is fixed to the walking device 2 through the steel strand 24, and the steel truss 10 is hoisted from the position adjacent to the main tower all the time, and has no requirement for the terrain and the channel below the main cable.

[0063] One of the main reasons that the erection method of the application can walk with the steel truss is that the lifting process is realized by the hanging device matched with the traction device 4, and the walking device 2 is only responsible for walking; and the walking device 2 is not provided with automatic force equipment, greatly reduces the weight, and the gravity center is biased to the steel truss, which is more safe and stable.

[0064] The second reason is that the erection system of the application lays the track 3 special for the walking device 2, the special track 3 can perfectly match the walking wheels 23 of the walking box body 22, has superior stress and good walking performance; at the same time, the track 3 is arranged in sections, and is laid while being disassembled and laid, which greatly saves the cost of the track 3 and is good in economy.

[0065] In one embodiment, the erection system further comprises a track 3, the track 3 is fixed to the bottom surface of the main cable 6 of the suspension bridge, and the running wheel 23 is slidably installed on the top surface of the track 3. The track 3 comprises a plurality of track segment units; during the process of the running device 2 carrying the steel truss 10 walking along the track 3 from the position adjacent to the main tower 9 to the far position, the track 3 is laid while walking, and the track segment units behind the walking direction of the running device 2 are removed and installed in front of the walking direction of the running device 2.

[0066] In step S1, the track 3 is laid along the main cable 6, and the running wheel 23 below the running box 22 is slidably arranged on the track 3;

[0067] In step S4, during the process of the running device 2 carrying the steel truss 10 walking along the track 3, the track segment units behind the walking direction of the running device 2 are removed and installed in front of the walking direction of the running device 2.

[0068] In one embodiment, the erection system further comprises a temporary clamp 5 in the shape of a claw, the temporary clamp 5 is fixed to the bottom surface of the track, and is used to clamp the main cable 6. The temporary clamp 5 is detachable. The track 3 is provided with a temporary clamp 5 at a certain interval, and the certain interval is determined according to the strength and rigidity of the track 3.

[0069] In one embodiment, the erection system further comprises a catwalk platform 7, the catwalk platform 7 is arranged in parallel below the main cable 6, and the catwalk platform 7 is used to carry workers and tool parts required by the hoisting and running system. Specifically, the track 3, the temporary clamp 5, the cable clamp and the like are installed by taking the catwalk platform 7 as a working platform.

[0070] Further, the catwalk platform 7 further comprises a panel layer 74, a handrail cable 73, a protective cable 72 and a bearing cable 71; a plurality of bearing cables 71 are formed in a plane parallel to the main cable 6, the panel layer 74 is laid on the top surface of all the bearing cables 71 to form a construction platform. The panel layer 74 is provided with a strip-shaped hole for avoiding interference with the steel strand. During the process of installing the track 3, the temporary clamp 5 and the cable clamp on the catwalk platform 7, a wooden board or the like is laid in the strip-shaped hole of the panel layer 74, and the wooden board or the like is removed during the process of the running device 2 carrying the steel truss to walk. The handrail cable 73 and the protective cable 72 are tensioned on both sides of the panel layer 74, and function as a protective fence to avoid accidents of construction workers and improve safety performance.

[0071] The erection system further comprises a traction cable assembly 8, the traction cable assembly 8 is tensioned above the main cable 6, and the traction cable assembly 8 is used to transport the boom 11.

[0072] Specifically, the traction cable assembly 8 contains two portal load-bearing cables 81 and two portal traction cables 82. Specifically, when the travelling device 2 walks the steel truss to the set position, the traction cable assembly 8 carries the boom 11, fixes the top end of the boom 11 to the cable clamp on the main cable, fixes the bottom end of the boom 11 to the steel truss, then loosens the bottom end of the steel strand from the steel truss, and converts the weight of the steel truss to the boom 11.

[0073] In step S1, the rail segment units of the track 3, the temporary clamps 5, and the cable clamps are all transported and installed by the catwalk platform 7.

[0074] In step S4, the transportation and installation of all booms 11 are completed by the traction cable assembly 8.

[0075] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "includes a" does not exclude the presence of additional identical elements in the process, method, article or device that includes the element.

[0077] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above.

Claims

1. A system for erecting steel trusses of a suspension bridge, characterized in that: Include: A hanging device, comprising a tower crane support (1), wherein the tower crane support (1) is arranged at the top of a main tower (9) of a suspension bridge, and both ends of the tower crane support (1) extend to both sides along the longitudinal direction of the bridge, and a pulley mechanism is arranged at one of the extended ends; A running device (2) comprising a through-hole jack (21), a running box (22) and a plurality of steel strands (24); a plurality of running wheels (23) for running along the main cable (6) of the suspension bridge are provided on the bottom surface of the running box (22); the through-hole jack (21) is vertically fixed to the top surface of the running box (22); and the steel strands (24) pass through the through-hole jack (21); A traction device (4) comprising a hoist (42) and a plurality of steel wire ropes (41), wherein the hoist (42) is fixed to the tower crane support (1); a portion of the steel wire ropes (41) is used for lifting the steel truss (10), and passes through a pulley mechanism at a side end of the tower crane support (1) and is connected to the hoist (42); another portion of the steel wire ropes (41) is connected to the traveling box (22) and the hoist (42); When the steel truss (10) is hoisted to a set height by the winch (42) via the steel wire rope (41), the steel truss (10) is transferred from the steel wire rope (41) of the traction device (4) to the steel strand (24) of the running device (2); The erection system further comprises a track (3), the bottom surface of the track (3) is fixed to the main cable (6), and the running wheel (23) is slidably mounted on the top surface of the track (3); the track (3) comprises a plurality of track segment units; When the running device (2) carries the steel truss (10) along the track (3) from a position adjacent to the main tower (9) to a distant place, the rail segment unit at the rear of the running device (2) is removed and installed at the front of the running device (2).

2. The system for erecting a steel truss girder for a suspension bridge according to claim 1, wherein: The erection system further comprises a plurality of claw-shaped and detachable temporary clamps (5), the temporary clamps (5) being arranged on the bottom surface of the track (3), and the temporary clamps (5) being used to clamp the main cable (6); a temporary clamp (5) is arranged at each set interval of the track (3).

3. The system for erecting a steel truss girder for a suspension bridge according to claim 1, wherein: The erection system further comprises a catwalk platform (7), which is arranged parallel to and below the main cable (6). The catwalk platform (7) is used to carry workers and tool parts required for hoisting the traveling device.

4. The system for erecting a steel truss girder for a suspension bridge according to claim 1, wherein: The erection system further comprises a traction cable assembly (8), wherein the traction cable assembly (8) is tensioned above the main cable (6), and the traction cable assembly (8) is used to transport the boom (11).

5. A method for erecting a suspension bridge steel truss based on the erection system of claim 1, characterized in that: The following steps are involved: S1: Install a tower crane support (1) at the top of the main tower (9) of the suspension bridge, and install a pulley mechanism at one of the protruding ends of the tower crane support (1); install a running device (2) on the main cable (6) near the main tower (9); install winches (42) of the traction device (4) at the top of the main tower (9) on both sides of the steel truss (10) to be installed, and the two winches (42) are fixed to the two ends of the running box (22) through steel wire ropes (41); S2: The steel truss (10) is moved to the lifting point on the ground, and the hoist (42) lifts the steel truss (10) to the set height through the steel wire rope (41) and the pulley mechanism; S3: Fix the steel truss (10) to the bottom end of the steel strand (24), and remove the steel wire rope (41) on the steel truss (10); S4: The winches (42) on both sides of the steel truss (10) to be installed are started, and the running device (2) moves the steel truss (10) along the longitudinal direction of the bridge to the mid-span design position; at the same time, the corresponding hanger (11) of the steel truss (10) is transported to the mid-span design position; the hanger (11) is installed, and the steel truss (10) is transferred from the steel strand (24) to the hanger (11) for fixation.

6. The method for erecting a suspension bridge steel truss system according to claim 5, wherein: Step S1 includes laying a track (3) along the main cable (6), and slidably setting the running wheel (23) below the running box (22) on the track (3); In step S4, while the running device (2) is moving along the track (3) with the steel truss (10), the rail segment units at the rear of the running device (2) are removed and installed in front of the running device (2).

7. The method for erecting a suspension bridge steel truss system according to claim 6, wherein: The erection system further comprises a plurality of claw-shaped and detachable temporary clamps (5), the temporary clamps (5) being arranged on the bottom surface of the track (3), and the temporary clamps (5) being used to clamp the main cable (6); a temporary clamp (5) is arranged at each set interval of the track (3).

8. The method for erecting a suspension bridge steel truss system according to claim 7, wherein: The erection system further comprises a catwalk platform (7), the catwalk platform (7) being arranged parallel to and below the main cable (6), the catwalk platform (7) being used to carry workers and tool parts required for hoisting the traveling device; the erection system further comprises a traction cable assembly (8), the traction cable assembly (8) being tensioned above the main cable (6), the traction cable assembly (8) being used to transport the boom (11); In step S1, the rail segment units, temporary clamps (5) and cable clamps of the track (3) are transported and installed via the catwalk platform (7); In step S4, all the transportation and installation work of the boom (11) is completed through the traction rope assembly (8).

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