Bridge main cable air unfolding method and system

Abstract

The invention discloses a bridge main cable air cable unfolding method and system, and the method comprises the steps: hoisting a cable disc to a cable unfolding frame through a crawler crane, hoisting and pulling out a front end anchor head to be connected with a small circulation traction system on a platform, starting the small circulation traction system, and pulling a cable strand to be close to a catwalk through a plane cable unfolding region; hoisting a front-end anchor head to be connected with a double-line reciprocating traction system, and starting the traction system to pull the cable strand to a terminal shore tunnel anchor to finish preliminary cable unfolding; a catwalk downward cable unfolding method or a multi-crane circulating lifting cable unfolding method is adopted to unfold the remaining main cable strands in the cable disc in stages, and a rear anchor head in the cable disc of the initial bank is taken out; after the main cable is hoisted, the anchor head is connected with a traction system in a tunnel anchor hole, the traction system in the hole is used for traction into the hole, and the cable unfolding operation of all the main cable strands is completed. According to the method, different aerial cable unfolding methods are adopted according to site conditions, the problem of spatial position conflict between the cable strands and the catwalk portal frame is effectively solved, site requirements are reduced, and cable unfolding flexibility and efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction, and more specifically, relates to a method and system for aerially deploying a bridge main cable. Background Art

[0002] A suspension bridge is a type of bridge with the main cable as the main load-bearing structure. The main cable is fixed to a solid anchor at both ends and supported by a tower. The accuracy and reliability of its installation play a decisive role in the stability and durability of the entire bridge. As a key step in the construction of a suspension bridge, the main cable deployment is in the early stage of the construction of the suspension bridge, and its progress directly affects the start of subsequent construction steps. In addition, the main cable deployment technology has high requirements, and the tension and position of the main cable need to be precisely controlled to ensure that it will not be twisted or damaged during the deployment process. However, bridge construction is often affected by geographical environment and climatic conditions. In mountainous areas, rivers or coastal areas, complex terrain and changeable weather conditions bring additional difficulties to the main cable deployment, and the efficiency of the main cable deployment directly affects the project cost. In addition, the main cable deployment process involves high-altitude operations and heavy object handling, which poses a challenge to the safety of construction workers. Therefore, improving the efficiency and safety of cable deployment is the key to ensuring the progress and quality of the entire project and the safety of personnel. Traditional main cable deployment methods usually transport the main cable from one end to the other and maintain its correct position and tension during the process.

[0003] In the prior art, such as the patent document with application number CN202311352399.5, the invention discloses a suspension bridge main cable erection traction system and method. The main cable erection traction system includes a support mechanism, multiple gantries, a traction mechanism, a winding device, a distance detection device and a control device, which can automatically control the speed of the puller when pulling the main cable strand through the gantries. The distance between the puller and the gantries is measured by the distance detection device and the distance is transmitted to the control device. When the puller approaches the gantries, the control device controls the winch to decelerate so that the puller pulls the main cable strand through the gantries; after the puller passes through the gantries, the control device controls the winch to accelerate so that the puller pulls the main cable strand to resume normal operating speed. The speed of the main cable anchor head passing before and after the gantries is automatically controlled during the erection of the main cable of the suspension bridge. However, during the cable deployment process, this method causes a spatial position conflict between the main cable strands and the catwalk gantry, which not only affects the efficiency of cable deployment but also may lead to construction safety problems, which directly affects the progress of the entire bridge construction. In addition, a large amount of space is required to store cable trays and arrange cable deployment equipment, which is difficult to meet at many bridge construction sites.

[0004] With the deepening of the concept of sustainable development, bridge construction pays more and more attention to environmental protection and resource conservation. The main cable deployment method also needs to consider reducing the impact on the environment. Therefore, it is necessary to provide a fast and efficient cable deployment method to reduce project costs, reduce land occupation, reduce energy consumption, and thus improve the comprehensive benefits of the project. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an aerial cable deployment method and system for a bridge main cable, which adopts a double-line reciprocating traction system to pull the main cable into the terminal shore to complete the initial cable deployment, and then adopts an aerial cable deployment method to deploy the remaining main cable strands in the cable drum in stages to complete the entire cable deployment operation, effectively solving the spatial position conflict problem between the cable strands and the catwalk gantry, reducing site requirements, and improving the flexibility and efficiency of cable deployment.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, the present application provides a method for aerially deploying a bridge main cable, comprising the following specific steps:

[0007] S1: Use a crawler crane to hoist the cable drum onto the cable laying frame, and use the crawler crane to hoist and pull out the front anchor head, connect it to the small circulation traction system on the platform, start the small circulation traction system, and pull the cable strand to the catwalk through the flat cable spreading area;

[0008] S2: Use crawler crane to hoist the front main cable anchor head and connect it to the double-line reciprocating traction system, start the main cable traction system to pull the cable strand to the terminal bank tunnel anchor and anchor it, completing the initial cable deployment;

[0009] S3: Use the main cable aerial deployment method to deploy the remaining main cable strands in the cable drum in stages, and remove the rear anchor head in the cable drum on the starting shore;

[0010] S4: After taking out the rear anchor head in the cable drum on the starting shore, hoist the rear anchor head of the main cable and connect it to the traction system in the tunnel anchor hole. Use the traction system in the hole to pull it into the hole until the main cable is pulled into the tunnel anchor on the starting shore and anchored, completing all the main cable strand extension operations.

[0011] Furthermore, in step S3, the main cable aerial deployment method includes: a catwalk downward deployment scheme, which adopts a combination of horizontal and vertical deployment schemes to deploy the main cable strands, with vertical deployment as the main method. In the vertical deployment area on the catwalk across the starting shore, a tower top winch is used to cooperate to complete the downward deployment of the main cable strand catwalk, and on the horizontal deployment line channel on the anchor steel platform of the tunnel on the starting shore, a multi-crane system is used to assist in deployment and pull out the main cable strand anchor head.

[0012] Furthermore, the catwalk downward extension scheme includes the following steps:

[0013] Step 1: The wire rope of the first tower top hoist is connected to the main cable strand at the marked position through the cable gripper, and the wire rope is slowly retracted, with manual auxiliary traction until the cable gripper connected to the first tower top hoist reaches the cable deployment area, completing the first stage of cable deployment operation;

[0014] Step 2: Remove the cable gripper, manually assist in pulling the wire rope of the first tower top winch to the marked position, connect the main cable strand through the cable gripper again, and the first tower top winch continues to slowly retract the wire rope, and the strand hangs vertically downward, completing the second stage of cable extension operation;

[0015] Step 3: The wire rope of the second tower top hoist is connected to the main cable strand at the marked position through the cable gripper, and the wire rope is slowly retracted. The main cable strand and the wire rope of the first tower top hoist are manually pulled into the vertical cable extension area together until the cable gripper connected to the second tower top hoist reaches the cable extension area. The vertical droop height of the cable strand increases, and the third stage of cable extension operation is completed;

[0016] Step 4: Remove the cable gripper, manually pull the wire rope of the second tower top hoist to the marked position, connect the main cable strand through the cable gripper again, and the second tower top hoist continues to slowly retract the wire rope. Manually assist in pulling the main cable and the wire rope of the first tower top hoist into the cable extension area until the cable gripper connected to the second tower top hoist is pulled to the cable extension area. The vertical droop height of the cable strand continues to increase, and the cable extension operation of the remaining cable strands is completed;

[0017] Step 5: Use a crawler crane to remove the rear anchor head from the cable drum to complete the entire cable deployment operation.

[0018] Furthermore, in step S3, the main cable aerial extension method further includes: a catwalk upward extension scheme:

[0019] Furthermore, the catwalk downward extension scheme also includes: before step one, marking the catwalk at a position 100m away from the tower top in advance.

[0020] Furthermore, in step S3, the main cable aerial deployment method also includes: a multi-crane cyclic lifting and deployment plan: in the main cable laying site upstream and downstream of the starting shore, crawler cranes, truck cranes and tower cranes of different arm lengths and tonnages are arranged according to the construction site conditions and the required cable deployment lengths, and the cable strands are respectively connected to the lifting points of the cable strands to cooperate with each other to slowly lift the cable strands to complete the deployment of main cables of different lengths.

[0021] Furthermore, the specific steps of the multi-crane cyclic lifting and cable extension scheme may include:

[0022] Step 1: Connect the crawler crane wire rope to the lifting point set on the main cable strand, slowly lift the strand to the flat cable spreading area, and all the strands are separated from the cable spreading track, completing the first stage of cable spreading of the remaining main cable strands in the cable tray;

[0023] Step 2: Use a truck crane to connect and lift the main cable strand at the lifting point set, slowly lift the strand, and complete the second stage of cable deployment;

[0024] Step 3: Use a tower crane to connect and lift the main cable strands at the lifting point, slowly lift the strands to the main cable anchor head and take them out from the cable drum, complete the laying of the remaining strands, and at the same time take out the rear anchor head in the cable drum on the starting shore.

[0025] According to another aspect of the present invention, the present application provides a bridge main cable aerial cable deployment system, which is used to implement the above-mentioned bridge main cable aerial cable deployment method, including: a main cable deployment device, a multi-hoist system and auxiliary components, wherein:

[0026] The main cable deployment device includes a double-line reciprocating traction system for preliminary cable deployment, a first tower top winch and a second tower top winch fixed on the tower top gantry at the top of the main tower for lowering the main cable when the catwalk is vertically deployed, a steering gantry, a rotating tug installed on the catwalk, a steel wire rope and a cable gripper connecting the main cable strand with the first tower top winch and the second tower top winch, and an in-hole traction system arranged in the tunnel anchor;

[0027] The multi-crane system is arranged in the main cable laying field upstream and downstream of the starting shore, including crawler cranes, truck cranes and tower cranes of different heights with different arm lengths and tonnages for laying cables;

[0028] The auxiliary components include a cable-laying rack and a small-circulation traction system.

[0029] Furthermore, a main cable vertical extension area is provided on the starting shore catwalk, and the steering gantry is installed in the main cable vertical extension area to guide the main cable strands to turn to a desired direction.

[0030] Furthermore, the density of the rotary tugboat is increased near the main cable vertical cable extension area, and a tugboat density area is provided, so that the vertical curve of the tugboat at the extension opening of the main cable vertical cable extension area has a smooth transition.

[0031] Furthermore, tunnel anchor hole platforms are provided upstream and downstream of the starting shore, and the main cable strand reels are stored on the tunnel anchor hole platforms.

[0032] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0033] 1. The present invention uses a multi-crane circulation system to perform aerial cable deployment of the main cable by utilizing a multi-crane circulation lifting, thereby solving the problem of spatial position conflict between the cable strands and the catwalk door frame when the main cable is deployed, thereby improving the safety of the construction.

[0034] 2. The present invention reduces the space required in the cable-laying process by optimizing the layout of the cable-laying equipment of the multi-crane system. At the same time, a tunnel anchor hole platform is set at the starting bank, and the cable-laying disc is placed on the tunnel anchor hole platform, which is closer to the catwalk, thereby further saving space and enabling efficient construction in a space-constrained environment, thereby reducing land occupation, reducing energy consumption, and reducing the impact on the environment, which is in line with the concept of sustainable development.

[0035] 3. The catwalk of the present invention extends the cables downward by combining horizontal and vertical methods, combining the horizontal cable extension channel on the tunnel anchor steel platform and the vertical cable extension opening on the catwalk. By arranging a rotatable tugboat in this section, the normal traction and lowering requirements of the main cable are met, thereby improving the flexibility and efficiency of the cable extension. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of a method for aerial deployment of a bridge main cable according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of multiple cranes cyclically lifting and laying cables in embodiment 3 of the present invention;

[0038] Figure 3 This is a schematic diagram of step 1 of extending the catwalk downwards in embodiment 3 of the present invention;

[0039] Figure 4 This is a schematic diagram of step 2 of extending the catwalk downwards in embodiment 3 of the present invention;

[0040] Figure 5 This is a schematic diagram of step 3 of extending the catwalk downwards in embodiment 3 of the present invention;

[0041] Figure 6 This is a schematic diagram of step 4 of extending the catwalk downwards in embodiment 3 of the present invention;

[0042] Figure 7 This is a schematic diagram of auxiliary cable extension of a mobile crane according to Embodiment 4 of the present invention;

[0043] Figure 8 This is a schematic diagram of auxiliary cable extension of a mobile crane according to Embodiment 5 of the present invention;

[0044] Fig. 9 This is a schematic diagram of auxiliary cable extension of a tower crane according to Embodiment 6 of the present invention;

[0045] In all the drawings, the same reference numerals represent the same technical features, specifically: 1-first tower top winch, 2-second tower top winch, 3-steering gantry, 4-rotating tugboat, 5-wire rope, 6-main cable strand, 7-main tower, 8-tower top gantry, 9-main cable vertical extension area, 10-tugboat density area, 11-tunnel anchor hole platform, 12-main cable strand, 13-rope laying site, 14-crawler crane, 15-truck crane, 16-tower crane. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement of the components under a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0048] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] Example 1

[0051] like Figure 2-9 As shown, an embodiment of the present invention provides an aerial cable deployment system based on multi-hoist cyclic lifting, including a main cable deployment device, a multi-hoist system and auxiliary components, wherein:

[0052] The main cable deployment device comprises:

[0053] The first tower top hoist 1 and the second tower top hoist 2 are fixed on the tower top gantry 8 at the top of the main tower 7 and are used to cooperate with the main cable to be lowered when the catwalk is vertically extended, and to pull the main cable strands to the designated position;

[0054] Main cable vertical extension area 9: set at the starting shore catwalk;

[0055] Tunnel anchor portal platform 11: set up upstream and downstream of the starting shore;

[0056] Rotating tugboat 4: installed on the catwalk, the density of the rotating tugboat 4 is increased at the cable-laying opening of the main cable vertical cable-laying area 9, and a tugboat density area 10 is set to guide the main cable strands 6 to move along a predetermined path. They can rotate freely and can automatically adjust the angle according to the actual movement direction of the strands to achieve normal traction of the main cable and lowering of the main cable in the main cable vertical cable-laying area 9.

[0057] Steel wire rope 5 and cable gripper: as key components connecting the main cable strand 6 with the first tower top hoist 1 and the second tower top hoist 2, they ensure safe and reliable lifting and traction processes.

[0058] Steering gantry 3: Installed in the main cable vertical cable extension area 9, used to steer and guide the main cable to ensure that the steel wire rope 5 connecting the main cable and the tower top winch is smoothly steered to the required direction.

[0059] Double-line reciprocating traction system: improves traction efficiency and main cable positioning accuracy, ensuring that the cables can be pulled to the designated position smoothly and accurately.

[0060] In-tunnel traction system: When the main cable strand is pulled to the catwalk or near the tunnel anchor, it cooperates with the crane system to pull the cable strand to the final anchoring position.

[0061] The multi-crane system is arranged in the main cable laying field upstream and downstream of the starting shore, and includes:

[0062] Crawler crane 14: used to hoist the cable tray from the ground to the cable rack, assist in pulling the cable strand anchor head, and provide necessary vertical and horizontal movement support during the cable extension process. Crawler cranes of different tonnages can be selected according to needs, such as 100t or 150t.

[0063] Truck crane 15: cooperates with crawler crane to carry out lifting and cable extension operations of main cable strands 6 in specific sections, which is especially suitable for fine adjustment over a shorter distance.

[0064] Tower crane 16: The tower crane can be used as an auxiliary equipment to help complete more difficult cable lifting tasks.

[0065] The auxiliary components include:

[0066] Cable release rack: used to support and fix the cable tray to ensure that the cable strands can be released smoothly;

[0067] Small-loop traction system: A small-loop traction system is set up in the flat cable-laying area to pull the cable strands to move on the flat cable-laying area.

[0068] Example 2

[0069] Based on the above system, the present application provides a method for aerial deployment of bridge main cables. Figure 1 A flow chart of a method for laying out a main cable of a bridge in the air provided in an embodiment of the present application. In this embodiment, the method includes the following specific steps:

[0070] S1: Use a crawler crane to hoist the cable drum onto the cable laying frame, and use the crawler crane to hoist and pull out the front anchor head, connect it to the small circulation traction system on the platform, start the small circulation traction system, and pull the cable strand to the catwalk through the flat cable spreading area;

[0071] S2: Use crawler crane to hoist the front main cable anchor head and connect it to the double-line reciprocating traction system, start the main cable traction system to pull the cable strand to the terminal bank tunnel anchor and anchor it, completing the initial cable deployment;

[0072] S3: Use the main cable aerial deployment method to deploy the remaining main cable strands in the cable drum in stages, and remove the rear anchor head in the cable drum on the starting shore;

[0073] S4: After taking out the rear anchor head in the cable drum on the starting shore, hoist the rear anchor head of the main cable and connect it to the traction system in the tunnel anchor hole. Use the traction system in the hole to pull it into the hole until the main cable is pulled into the tunnel anchor on the starting shore and anchored, completing all the main cable strand extension operations.

[0074] The main cable aerial deployment method in step S3 may include:

[0075] (1) A combination of horizontal and vertical methods is used to lay the main cable strands, with vertical laying as the main method. A vertical laying area is set on the catwalk at the starting shore. Rotatable tugboats are set at the laying ports at both ends of the section to meet the normal traction and lowering requirements of the main cable. The first and second winches on the tower top are used to complete the downward laying of the main cable strand catwalk. A horizontal laying channel is set on the anchor steel platform of the tunnel at the starting shore. A multi-crane system is used to assist in laying and pulling out the anchor head of the main cable strand. The following specific steps are included:

[0076] Step 1: The wire rope of the first tower top hoist is connected to the main cable strand at the marked position through a cable gripper, and the wire rope is slowly retracted, with manual assisted traction until the cable gripper connected to the first tower top hoist reaches the cable deployment area, completing the first stage of cable deployment; the marked position is the mark made in advance on the catwalk 100m away from the tower top;

[0077] Step 2: Remove the cable gripper, manually assist in pulling the wire rope of the first tower top winch to the marked position, connect the main cable strand through the cable gripper again, and the first tower top winch continues to slowly retract the wire rope, and the strand hangs vertically downward, completing the second stage of cable extension operation;

[0078] Step 3: The wire rope of the second tower top hoist is connected to the main cable strand at the marked position through the cable gripper, and the wire rope is slowly retracted. The main cable strand and the wire rope of the first tower top hoist are manually pulled into the vertical cable extension area together until the cable gripper connected to the second tower top hoist reaches the cable extension area. The vertical droop height of the cable strand increases, and the third stage of cable extension operation is completed;

[0079] Step 4: Remove the cable gripper, manually pull the wire rope of the second tower top hoist to the marked position, connect the main cable strand through the cable gripper again, and the second tower top hoist continues to slowly retract the wire rope. Manually assist in pulling the main cable and the wire rope of the first tower top hoist into the cable extension area until the cable gripper connected to the second tower top hoist is pulled to the cable extension area. The vertical droop height of the cable strand continues to increase, and the cable extension operation of the remaining cable strands is completed;

[0080] Step 5: Use a crane to remove the anchor head from the cable drum to complete the entire cable deployment operation.

[0081] (2) Multi-crane cyclic lifting and cable laying scheme: In the main cable laying site upstream and downstream of the starting shore, crawler cranes, truck cranes and tower cranes of different arm lengths and tonnages are arranged according to the construction site conditions and the required cable lengths. They are connected to the cable lifting points and cooperate with each other to slowly lift the cables to complete the laying of main cables of different lengths. The specific steps may include:

[0082] Step 1: Connect the crawler crane wire rope to the lifting point set on the main cable strand, slowly lift the strand to the flat cable extension area, and all the strands are separated from the cable extension track, completing the first stage of cable extension of the remaining main cables in the cable tray;

[0083] Step 2: Use a truck crane to connect and lift the main cable strand at the lifting point set, and slowly lift the strand to complete the second stage of cable deployment.

[0084] Step 3: Use a tower crane to connect and lift the main cable strands at the lifting point, slowly lift the strands to the main cable anchor head and take them out from the cable drum, complete the laying of the remaining strands, and at the same time take out the rear anchor head in the cable drum on the starting shore.

[0085] like Figure 2 As shown, in this embodiment, three types of cranes cooperate with cyclic lifting to perform aerial deployment of the main cable, and different combinations of crane deployment schemes can also be selected according to the required deployment length and site space.

[0086] Embodiment 3:

[0087] The technical solution of the aerial cable deployment method of the present invention is further illustrated by Example 3. The embodiment of the present invention is the deployment of the main cable of a super-large bridge across a river in a certain engineering project. The main cable strands are deployed by combining horizontal and vertical deployment, with vertical deployment being the main method. The vertical deployment is carried out on the catwalk across the starting shore. The length of the cable required to be vertically deployed on the catwalk is 74m. A main cable deployment area is set on the catwalk with a length of 36m; the horizontal deployment is to deploy 18m of cable in a plane on the anchor hole platform of the tunnel on the starting shore, and a crane is used to deploy 20m of cable, with a total of 38m of horizontal deployment, of which 18m of cable deployment has been completed on the platform when the main cable is pulled. The specific steps are as follows:

[0088] like Figure 3 Step 1 of extending the catwalk downward in this embodiment:

[0089] S101: A double-line reciprocating traction system is used to tow the main cable strand from the starting shore cable-laying field to the terminal shore tunnel anchor saddle chamber section. The remaining main cable length in the main cable drum is 114m.

[0090] S102: The traction system in the terminal shore tunnel is used to tow the ship to the front anchor surface, and the fall chain is used to anchor the ship. In this state, the remaining length of the cable strand in the cable drum on the starting shore is 96m, and the tugboat in the vertical cable extension area of ​​the catwalk is perpendicular to the forward direction of the catwalk.

[0091] S104: A mark has been made in advance on the catwalk at a position 100m away from the tower top. The first tower top winch and φ24mm steel wire rope are used to connect the main cable strands at the marked position through the rope grip.

[0092] S105: Manual cooperation is used to turn the rotating tugboat in the cable deployment area to the forward direction of the parallel catwalk.

[0093] S106: The first tower top winch slowly retracts the wire rope, and the operator assists in pulling the main cable into the vertical cable extension area in the tugboat density area.

[0094] S107: The first tower top winch pulls 19m. At this time, the No. 1 winch connected to the rope gripper has been pulled to the rope deployment area, completing the first stage of rope deployment. In this state, 19m of rope has been deployed.

[0095] like Figure 4 Step 2 of extending the catwalk downward in this embodiment:

[0096] S201: Remove the cable grip, manually pull the wire rope of the first tower top winch to the marked position, and use the φ24mm wire rope of the first tower top winch to connect the main cable strand through the cable grip.

[0097] S202: Manual cooperation is used to turn the rotating tugboat in the cable deployment area to the forward direction of the parallel catwalk.

[0098] S203: The first tower top winch slowly retracts the wire rope, and the operator assists in pulling the main cable into the vertical cable extension area at the tugboat density area to complete the second stage of cable extension. In this state, 38m of cable has been extended, and the vertical height of the cable strand is about 32m.

[0099] like Figure 5 Step 3 of extending the catwalk downward in this embodiment:

[0100] S301: Use the φ24mm steel wire rope of the second tower top winch to connect the main cable strands through a cable grip at the mark position 100m away from the tower top.

[0101] S302: The second tower top winch slowly retracts the wire rope, and the operator assists in the main cable traction in the tugboat density area, pulling the main cable and the first tower top winch wire rope into the cable deployment area.

[0102] S303: The second tower top winch pulls 19m. At this time, the second tower top winch connected to the rope gripper has been pulled to the rope deployment area, completing the third stage of rope deployment. In this state, 57m of rope has been deployed, and the vertical height of the rope strand is about 41m.

[0103] like Figure 6 Step 4 of extending the catwalk downward in this embodiment:

[0104] S401: Remove the rope gripper and manually pull the wire rope of the second tower top winch to the marked position.

[0105] S402: The φ24mm steel wire rope of the second tower top winch is connected to the main cable strand through a cable gripper.

[0106] S403: The second tower top winch slowly retracts the wire rope, and the operator assists in the main cable traction in the tugboat density area, pulling the main cable and the first tower top winch wire rope into the cable deployment area.

[0107] S404: The second tower top winch pulls 19m. At this time, the winch connected to the rope gripper has been pulled to the rope deployment area, completing the fourth stage of rope deployment. In this state, 76m of rope has been deployed, and the vertical height of the rope strand is about 52m.

[0108] S405: After the vertical cable deployment is completed, the remaining cable strand length in the main cable drum is 20m. The horizontal cable deployment crane is used to remove the rear anchor head and hoist it to the traction system at the starting shore tunnel entrance, and then the cable crane in the starting shore tunnel is used to pull it into the tunnel.

[0109] Embodiment 4:

[0110] like Figure 7The figure shows the schematic diagram of the auxiliary cable deployment of the automobile crane in this embodiment: after the upstream main cable is pulled to the terminal shore and anchored, the remaining main cable strand length in the cable drum is 114m, and the cable needs to be deployed to pull out the main cable strand anchor head. In this embodiment, a crawler crane and an automobile crane are used to coordinate the cable deployment. A 150t crawler crane and a 30t automobile crane are arranged in the upstream main cable laying field, wherein the arm length of the 150t crawler crane is 52m, and the arm length of the 30t automobile crane is 40m. The specific cable deployment steps are as follows:

[0111] Step 1: Connect the wire rope of the 150t crawler crane to the lifting point set on the main cable strand, and slowly lift the strand to the flat cable extension area until all the strands are off the cable extension track. In this state, 80m of cable extension has been completed and the maximum lifting weight is 15t.

[0112] Step 2: Use a 30t truck crane to connect and lift the main cable strand at the set lifting point, slowly lift the strand to the main cable anchor head and take it out from the cable drum to complete the 32m cable extension. The maximum lifting weight of the truck crane is 0.6t.

[0113] Step 3: The crawler crane and the truck crane swing their booms to the right at the same time to connect the main cable anchor head with the traction system in the tunnel. The truck crane slowly releases the hook, and the traction system in the tunnel pulls inwards synchronously, removing the connecting wire rope of the truck crane.

[0114] Step 4: The crawler crane cooperates with the traction system in the tunnel to slowly release the hook until the main cable is completely pulled into the tunnel anchor on the starting bank.

[0115] Embodiment 5:

[0116] like Figure 8 The figure shows the auxiliary cable deployment schematic diagram of the automobile crane in this embodiment. This embodiment is the downstream cable deployment scheme of embodiment 5. After the downstream main cable is pulled to the terminal shore and anchored, the remaining main cable strand length is 83m, and the main cable strand anchor head needs to be pulled out for cable deployment. A 100t crawler crane and a 30t automobile crane are arranged in the downstream main cable laying field, wherein the arm length of the 100t crawler crane is 39m, and the arm length of the 30t automobile crane is 40m. The specific cable deployment steps are as follows:

[0117] Step 1: Use a 1000t crawler crane to lift the anchor head of the main cable strand and carry out the first cable extension, completing 54m of cable extension.

[0118] Step 3: Use a 30t truck crane to carry out the second cable extension, and complete the extension of 29m. After the cable extension is completed, the crawler crane boom swings to the left and hoist the main cable anchor head to the traction system in the tunnel.

[0119] Step 4: The truck crane and crawler crane swing their booms to the left synchronously, hoist the main cable anchor head to the traction system in the tunnel, the crawler crane slowly lowers the hook, the traction system in the tunnel pulls synchronously, the crawler crane hook is released, the truck crane slowly lowers the hook, the truck crane hook is released, and the main cable is deployed.

[0120] Embodiment 6:

[0121] like Fig. 9 The figure shows a schematic diagram of tower crane auxiliary cable extension in this embodiment. The difference between the embodiment of the present invention and embodiment 3 is that tower crane auxiliary cable extension is adopted. After the upstream main cable is pulled to the terminal shore and anchored, the remaining main cable strand length is 114m, and the cable extension needs to be performed to pull out the main cable strand anchor head. A 150t crawler crane and a WA7025 tower crane are arranged in the upstream main cable laying field, wherein the arm length of the 150t crawler crane is 52m, and the arm length of the tower crane is 35m. The specific cable extension steps are as follows:

[0122] Step 1: Connect the wire rope of the 150t crawler crane to the lifting point set on the main cable strand, and slowly lift the strand to the flat cable extension area until all the strands are off the cable extension track. In this state, 60m of cable extension has been completed.

[0123] Step 2: Use a tower crane to connect and lift the main cable strand at the set lifting point, slowly lift the strand to the main cable anchor head and take it out from the cable drum to complete the cable extension of 54m.

[0124] Step 3: The crawler crane boom swings to the right and the tower crane boom swings to the left, connecting the main cable anchor head with the traction system in the tunnel. The tower crane slowly releases the hook, and the traction system in the tunnel pulls inwards synchronously, removing the tower crane connecting wire rope.

[0125] Step 4: The crawler crane cooperates with the traction system in the tunnel to slowly release the hook until the main cable is completely pulled into the tunnel anchor on the starting bank.

[0126] In summary of the above embodiments, different main cable aerial laying methods can be selected according to the site conditions, construction space and required cable laying length to achieve fast, efficient and safe construction of suspension bridges.

[0127] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for laying out the main cable of a bridge in the air, characterized in that: The specific steps include: S1: Use a crawler crane to hoist the cable drum onto the cable laying frame, and use the crawler crane to hoist and pull out the front anchor head, connect it to the small circulation traction system on the platform, start the small circulation traction system, and pull the cable strand to the catwalk through the flat cable spreading area; S2: Use crawler crane to hoist the front main cable anchor head and connect it to the double-line reciprocating traction system, start the main cable traction system to pull the cable strand to the terminal bank tunnel anchor and anchor it, completing the initial cable deployment; S3: Use the main cable aerial deployment method to deploy the remaining main cable strands in the cable drum in stages, and remove the rear anchor head in the cable drum on the starting shore; S4: After taking out the rear anchor head in the cable drum on the starting shore, hoist the rear anchor head of the main cable and connect it to the traction system in the tunnel anchor hole. Use the traction system in the hole to pull it into the hole until the main cable is pulled into the tunnel anchor on the starting shore and anchored, completing all the main cable strand extension operations.

2. A method for laying out a bridge main cable in the air according to claim 1, characterized in that: In the step S3, the main cable aerial deployment method includes: a catwalk downward deployment scheme, which adopts a combination of horizontal and vertical schemes to deploy the main cable strands, with vertical deployment as the main method. In the vertical deployment area on the catwalk across the starting shore, the tower top winch is used to cooperate to complete the downward deployment of the main cable strand catwalk, and on the horizontal deployment channel on the anchor steel platform of the tunnel on the starting shore, a multi-crane system is used to assist in the deployment and pull out the main cable strand anchor head.

3. A method for laying out a bridge main cable in the air according to claim 2, characterized in that: The catwalk downward extension scheme comprises the following steps: Step 1: The wire rope of the first tower top hoist is connected to the main cable strand at the marked position through the cable gripper, and the wire rope is slowly retracted, with manual auxiliary traction until the cable gripper connected to the first tower top hoist reaches the cable deployment area, completing the first stage of cable deployment operation; Step 2: Remove the cable gripper, manually assist in pulling the wire rope of the first tower top winch to the marked position, connect the main cable strand through the cable gripper again, and the first tower top winch continues to slowly retract the wire rope, and the strand hangs vertically downward, completing the second stage of cable extension operation; Step 3: The wire rope of the second tower top hoist is connected to the main cable strand at the marked position through the cable gripper, and the wire rope is slowly retracted. The main cable strand and the wire rope of the first tower top hoist are manually pulled into the vertical cable extension area together until the cable gripper connected to the second tower top hoist reaches the cable extension area. The vertical droop height of the cable strand increases, and the third stage of cable extension operation is completed; Step 4: Remove the cable gripper, manually pull the wire rope of the second tower top hoist to the marked position, connect the main cable strand through the cable gripper again, and the second tower top hoist continues to slowly retract the wire rope. Manually assist in pulling the main cable and the wire rope of the first tower top hoist into the cable extension area until the cable gripper connected to the second tower top hoist is pulled to the cable extension area. The vertical droop height of the cable strand continues to increase, and the cable extension operation of the remaining cable strands is completed; Step 5: Use a crawler crane to remove the rear anchor head from the cable drum to complete the entire cable deployment operation.

4. A method for laying out a bridge main cable in the air according to claim 3, characterized in that: The catwalk downward extension scheme also includes: before step 1, marking the catwalk at a position 100m away from the tower top in advance.

5. A method for laying out a bridge main cable in the air according to any one of claims 1 to 4, characterized in that: In step S3, the main cable aerial deployment method also includes: a multi-crane cyclic lifting and deployment plan: in the main cable laying field upstream and downstream of the starting shore, crawler cranes, truck cranes and tower cranes of different arm lengths and tonnages are arranged according to the construction site conditions and the required cable deployment lengths, and the cable strands are respectively connected to the cable lifting points to cooperate with each other to slowly lift the cable strands to complete the deployment of main cables of different lengths.

6. A method for laying out a bridge main cable in the air according to claim 5, characterized in that: The specific steps of the multi-crane cyclic lifting and cable extension scheme include: Step 1: Connect the crawler crane wire rope to the lifting point set on the main cable strand, slowly lift the strand to the flat cable spreading area, and all the strands are separated from the cable spreading track, completing the first stage of cable spreading of the remaining main cable strands in the cable tray; Step 2: Use a truck crane to connect and lift the main cable strand at the lifting point set, slowly lift the strand, and complete the second stage of cable deployment; Step 3: Use a tower crane to connect and lift the main cable strands at the lifting point, slowly lift the strands to the main cable anchor head and take them out from the cable drum, complete the laying of the remaining strands, and at the same time take out the rear anchor head in the cable drum on the starting shore.

7. An aerial cable deployment system for a bridge main cable, used to implement an aerial cable deployment method for a bridge main cable as claimed in any one of claims 1 to 6, comprising a main cable deployment device, a multi-hoist system and auxiliary components, wherein: The main cable deployment device comprises a double-line reciprocating traction system for preliminary cable deployment, a first tower top winch (1) and a second tower top winch (2) fixed on a tower top gantry (8) at the top of the main tower (7) for lowering the main cable in coordination with the main cable when the catwalk is vertically deployed, a steering gantry (3), a rotating tug (4) installed on the catwalk, a steel wire rope (5) and a cable gripper connecting the main cable strand (6) with the first tower top winch (1) and the second tower top winch (2), and an in-tunnel traction system arranged in a tunnel anchor; The multi-crane system comprises crawler cranes (14) of different arm lengths and tonnages, truck cranes (15) and tower cranes (16) of different heights that are compatible with the cable extension; The auxiliary components include a cable-laying rack and a small-circulation traction system.

8. The aerial cable deployment system for bridge main cables according to claim 7, characterized in that: A main cable vertical extension area (9) is provided on the catwalk across the starting shore, and the steering gantry (3) is installed on the main cable vertical extension area (9) to guide the main cable strand (6) to turn in a desired direction.

9. The aerial cable deployment system for bridge main cables according to claim 8, characterized in that: The density of the rotary tugboat (4) is increased near the main cable vertical cable extension area (9), and a tugboat density area (10) is provided, so that the vertical curve of the tugboat at the extension opening of the main cable vertical cable extension area (9) has a smooth transition.

10. The main cable aerial deployment system for a bridge according to claim 9, characterized in that: Tunnel anchor hole platforms (11) are arranged upstream and downstream of the starting bank, and main cable strand reels are stored on the tunnel anchor hole platforms (11).

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