Method and system for aerial catenary of bridge main cable

Abstract

The application discloses a bridge main cable aerial cable spreading method and system, which comprises the following steps: a cable reel is hoisted to a cable spreading frame by a caterpillar crane, a front end anchor head and a small circulation traction system on a platform are connected by hoisting, the small circulation traction system is started, a cable strand is pulled to a catwalk by a plane cable spreading area, the front end anchor head is connected with a double-wire reciprocating traction system, the traction system is started, the cable strand is pulled to a terminal point tunnel anchor, preliminary cable spreading is completed, the remaining main cable strand in the cable reel is spread in stages by a catwalk downward cable spreading method or a multi-crane circulation lifting cable spreading method, and a rear anchor head in a starting shore cable reel is taken out, the main cable rear anchor head is connected with a tunnel anchor hole traction system, the tunnel anchor hole traction system is used for traction into the hole, and the whole main cable strand spreading operation is completed. According to the method, different aerial cable spreading methods are adopted according to site conditions, the space position conflict problem between the cable strand and the catwalk portal frame is effectively solved, the site requirement is reduced, and the flexibility and efficiency of cable spreading are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bridge construction, and more particularly relates to a method and system for aerial cable spreading of a bridge main cable. BACKGROUND

[0002] Suspension bridges are a type of bridge where the main cable is the primary load-bearing structure, anchored at both ends to strong anchorage points and supported by towers. The accuracy and reliability of the installation of the main cable play a decisive role in the stability and durability of the entire bridge. As a critical step in the construction of suspension bridges, the main cable spreading is in the early stage of suspension bridge construction, and its progress directly affects the start of subsequent construction steps. The main cable spreading technology requires precise control of the tension and position of the main cable to ensure that it does not twist or damage during the spreading process. Bridge construction is often affected by geographical and climatic conditions, and in mountainous, river or coastal areas, complex terrain and variable weather conditions make the main cable spreading more difficult, and the efficiency of the main cable spreading directly affects the project cost. The main cable spreading process involves high-altitude work and heavy lifting, which poses a challenge to the safety of construction personnel. Therefore, improving the efficiency and safety of the spreading is crucial to ensuring the progress and quality of the entire project and the safety of personnel. Traditional main cable spreading 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, which includes a support mechanism, multiple gantries, a traction mechanism, a winding device, a distance detection device, and a control device. The speed of the puller when pulling the main cable strand through the gantry can be automatically controlled, the distance between the puller and the gantry is measured by the distance detection device and transmitted to the control device, and when the puller approaches the gantry, the control device controls the winch to slow down so that the puller pulls the main cable strand at a reduced speed through the gantry. After the puller passes through the gantry, the control device controls the winch to speed up so that the puller pulls the main cable strand back to normal operating speed. This method automatically controls the speed of the main cable anchor head before and after passing through the gantry during the suspension bridge main cable erection process. However, in the spreading process, the main cable strand and the catwalk gantry have a spatial position conflict, which not only affects the efficiency of the spreading, but also may cause safety problems during construction, which directly affects the progress of the entire bridge construction, and a large amount of space is needed to store the cable reel and arrange the spreading equipment, which is difficult to meet in many bridge construction sites.

[0004] With the deepening of the concept of sustainable development, bridge construction is increasingly focusing on environmental protection and resource conservation. The method of main cable deployment also needs to consider minimizing environmental impact. Therefore, there is a need to provide a fast and efficient cable deployment method to reduce project costs, land occupation, and energy consumption, thereby improving the overall benefits of the project. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a method and system for aerial cable laying of bridge main cables. The method employs a dual-line reciprocating traction system to pull the main cable to the terminal bank for initial cable laying, followed by a phased, cyclical aerial cable laying method to lay the remaining main cable strands in the cable reel, completing the entire cable laying operation. This effectively solves the spatial positional conflict between the cable strands and the catenary gantry, reduces site requirements, and improves the flexibility and efficiency of cable laying.

[0006] To achieve the above objectives, according to one aspect of the present invention, this application provides a method for aerial cable deployment of a bridge main cable, comprising the following specific steps:

[0007] S1: Use a crawler crane to lift the cable reel onto the cable laying frame, and use the crawler crane to lift 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 planar cable laying area;

[0008] S2: Use a crawler crane to lift 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 strands to the end bank tunnel anchor and anchor them, completing the initial cable laying.

[0009] S3: The remaining main cable strands in the cable reel are laid out in stages using the main cable aerial laying method, and the rear anchor head in the initial shore cable reel is removed.

[0010] S4: After removing the rear anchor head from the starting shore cable reel, hoist the rear anchor head of the main cable and connect it to the traction system inside the tunnel anchorage. Use the traction system inside the tunnel to pull the cable into the tunnel until the main cable is pulled into the starting shore tunnel anchorage and anchored, completing all main cable strand extension operations.

[0011] Furthermore, in step S3, the main cable aerial cable laying method includes: a catwalk downward cable laying scheme, which adopts a combination of horizontal and vertical cable laying, with vertical cable laying as the main method. In the vertical cable laying area on the starting bank across the catwalk, the main cable strands are laid downward through the catwalk using a tower top winch. On the horizontal cable laying channel on the anchor steel platform of the starting bank tunnel, a multi-crane system is used to assist in cable laying and pull out the main cable strand anchor head.

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

[0013] Step one: the first tower hoist wire rope through the gripper connection mark position main cable strand, and slowly collect the wire rope, manual auxiliary traction until the first tower hoist gripper to reach the exhibition location, complete the first stage of exhibition work;

[0014] Step two: remove the gripper, and manually assist the first tower hoist wire rope to the mark position, and connect the main cable strand through the gripper again. The first tower hoist continues to slowly collect the wire rope, and the strand is vertically down. The second stage of exhibition work is completed.

[0015] Step three: the second tower hoist wire rope through the gripper connection mark position main cable strand, and slowly collect the wire rope, manual auxiliary traction main cable strand and first tower hoist wire rope together into the vertical exhibition area, until the second tower hoist gripper reaches the exhibition area position, the strand vertically down height increases, complete the third stage of exhibition work;

[0016] Step four: remove the gripper, manually pull the second tower hoist wire rope to the mark position, connect the main cable strand through the gripper again. The second tower hoist continues to slowly collect the wire rope, and the main cable and the first tower hoist wire rope are manually assisted into the exhibition area. Until the second tower hoist gripper is pulled to the exhibition area position, the strand vertically down height continues to increase, and the remaining strand exhibition work is completed.

[0017] Step five: use crawler crane to complete the whole exhibition work.

[0018] Further, in step S3, the main cable aerial exhibition method further comprises: catwalk upward exhibition scheme:

[0019] Further, the catwalk downward exhibition scheme further comprises: marking the catwalk at a position 100 m away from the tower top before step one.

[0020] Further, in step S3, the main cable aerial exhibition method further comprises: multi-crane cyclic lifting exhibition scheme: according to the construction site conditions and the length of the exhibition cable, different arm lengths and tonnage crawler cranes, automobile cranes and different height tower cranes are arranged in the starting shore downstream main cable cable laying field, which are respectively connected with the lifting points of the strand to cooperate with each other to slowly lift the strand and complete the exhibition of main cable of different lengths.

[0021] Further, the specific steps of the multi-crane cyclic lifting exhibition scheme can include:

[0022] Step one: connect the crawler crane wire rope with the set lifting point of the main cable strand, slowly lift the strand to the plane exhibition area, and complete the first stage of exhibition of the remaining main cable strand in the cable tray.

[0023] Step two: connecting and lifting by using the automobile crane at the set lifting point of the main cable strand, slowly lifting the strand, and completing the second stage of strand deployment;

[0024] Step three: connecting and lifting by using the tower crane at the main cable strand deployment lifting point, slowly lifting the strand to the main cable anchor head from the cable drum, and completing the remaining strand deployment, while taking out the rear anchor head in the initial shore cable drum.

[0025] According to another aspect of the present application, the present application provides a bridge main cable aerial deployment system for implementing the above-mentioned bridge main cable aerial deployment method, which comprises a main cable deployment device, a multi-crane system, and an auxiliary assembly, wherein,

[0026] The main cable deployment device comprises a double-line reciprocating traction system for preliminary deployment, a tower top gantry fixed to the top of the main tower, a first tower top winch and a second tower top winch for cooperating with the main cable lowering during catwalk vertical deployment, a turning gantry, a rotating tow wheel installed on the catwalk, a steel wire rope connecting the main cable strand and the first tower top winch and the second tower top winch, and a grip, and an in-hole traction system arranged in the tunnel anchor;

[0027] The multi-crane system is arranged in the initial shore upstream and downstream main cable deployment field, and comprises crawler cranes, automobile cranes, and tower cranes with different arm lengths and tonnages for cooperating with deployment;

[0028] The auxiliary assembly comprises a deployment frame and a small circulation traction system.

[0029] Further, a main cable vertical deployment area is arranged on the catwalk at the initial shore side, and the turning gantry is installed in the main cable vertical deployment area for guiding the main cable strand to turn to the required direction.

[0030] Further, the density of the rotating tow wheels is increased near the main cable vertical deployment area, a tow wheel encryption area is arranged, and the vertical curve of the tow wheels at the deployment opening of the main cable vertical deployment area is smoothly transitioned.

[0031] Further, tunnel anchor hole platforms are arranged upstream and downstream of the initial shore, and the main cable strand drums are stored in the tunnel anchor hole platforms.

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

[0033] 1. The present application uses a multi-crane circulation system to lift the main cable aerial deployment by a multi-crane circulation system, solves the problem of space position conflict between the strand and the catwalk gantry during main cable deployment, and improves the safety of construction.

[0034] 2. The present application optimizes the layout of the multi-crane system exhibition cable equipment, reduces the space required during the exhibition process, and at the same time, sets up a tunnel anchor hole platform at the starting shore, places the cable laying disc on the tunnel anchor hole platform, which is closer to the catwalk, thereby further saving space, enabling efficient construction in a space-limited environment, reducing land occupation, reducing energy consumption, reducing the impact on the environment, and meeting the concept of sustainable development.

[0035] 3. The catwalk downward exhibition of the present application is performed by adopting a horizontal and vertical combination mode, which combines the horizontal exhibition line channel on the tunnel anchor steel platform and the vertical exhibition port on the catwalk, and through the setting of a rotatable tug in this section, the normal traction and lowering requirements of the main cable are met, and the flexibility and efficiency of the exhibition are improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A bridge main cable aerial exhibition method flowchart for an embodiment of the present application;

[0037] Figure 2 An embodiment 3 multi-crane cyclic lifting exhibition schematic diagram of the present application;

[0038] Figure 3 An embodiment 3 catwalk downward exhibition step one schematic diagram of the present application;

[0039] Figure 4 An embodiment 3 catwalk downward exhibition step two schematic diagram of the present application;

[0040] Figure 5 An embodiment 3 catwalk downward exhibition step three schematic diagram of the present application;

[0041] Figure 6 An embodiment 3 catwalk downward exhibition step four schematic diagram of the present application;

[0042] Figure 7 An embodiment 4 automobile crane auxiliary exhibition schematic diagram of the present application;

[0043] Figure 8 An embodiment 5 automobile crane auxiliary exhibition schematic diagram of the present application;

[0044] Figure 9 An embodiment 6 tower crane auxiliary exhibition schematic diagram of the present application;

[0045] In all the drawings, the same reference signs represent the same technical features, specifically: 1 - first tower top winch, 2 - second tower top winch, 3 - turning portal, 4 - rotatable tug, 5 - steel wire rope, 6 - main cable strand, 7 - main tower, 8 - tower top portal, 9 - main cable vertical exhibition area, 10 - tug encryption area, 11 - tunnel anchor hole platform, 12 - main cable strand, 13 - cable laying field, 14 - crawler crane, 15 - automobile crane, 16 - tower crane. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in the various embodiments of the present application 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 the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can implement it, and when the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0048] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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; it can be the internal connection of two elements or the interaction relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In this patent, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0050] Embodiment 1

[0051] As Figures 2-9 shown, the embodiment of the present application provides an aerial cableway system based on multi-crane cyclic lifting, which comprises a main cableway device, a multi-crane system and an auxiliary assembly, wherein:

[0052] The main cableway device comprises:

[0053] First tower top winch 1, second tower top winch 2: fixed on the tower top portal 8 at the top of the main tower 7, used for catwalk vertical cable laying when cooperating with the main cable lowering, pulling the main cable strand to the designated position;

[0054] Main cable vertical cable laying area 9: set on the starting shore catwalk;

[0055] Tunnel anchor hole platform 11: set on the starting shore downstream;

[0056] Rotary tug 4: installed on the catwalk, increasing the density of the rotary tug 4 at the laying position of the main cable vertical cable laying area 9, setting the tug encryption area 10, used for guiding the main cable strand 6 to move along the predetermined path, which can rotate freely, and they can automatically adjust the angle according to the actual movement direction of the strand, realizing the normal traction of the main cable and the lowering of the main cable in the main cable vertical cable laying area 9.

[0057] Steel wire rope 5, grip: as a key component connecting the main cable strand 6 and the first tower top winch 1 and the second tower top winch 2, ensuring safe and reliable hoisting and traction process.

[0058] Steering portal 3: installed on the main cable vertical cable laying area 9, used for steering and guiding the main cable, ensuring that the steel wire rope 5 connecting the main cable and the tower top winch smoothly turns to the desired direction.

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

[0060] In-hole 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 strand to the final anchoring position.

[0061] The multi-crane system is arranged in the main cable laying field on the starting shore downstream, including:

[0062] Crawler crane 14: used for hoisting the cable disc from the ground to the laying frame, and assisting in pulling the strand anchor head, as well as providing necessary vertical and horizontal movement support during cable laying. According to the needs, different tonnage crawler cranes can be selected, such as 100t or 150t.

[0063] Automobile crane 15: cooperates with the crawler crane to carry out the main cable strand 6 hoisting and laying operation in a specific section, especially suitable for short-distance fine adjustment.

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

[0065] The auxiliary components include:

[0066] Laying frame: used for supporting and fixing the cable disc, ensuring that the strand can be smoothly laid out;

[0067] Small cycle traction system: a small cycle traction system is arranged in the plane cable spreading area, and is used for traction of the cable strand on the plane cable spreading area.

[0068] Embodiment 2

[0069] Based on the above system, the application provides a bridge main cable aerial cable spreading method, Figure 1 For the flow chart of the bridge main cable aerial cable spreading method provided in the embodiment of the application, the method includes the following specific steps in the embodiment:

[0070] S1: the cable disc is hoisted to the cable spreading frame by the crawler crane, the front end anchor head is hoisted and pulled out by the crawler crane, and is connected with the small cycle traction system on the platform, the small cycle traction system is started, the cable strand is pulled to the catwalk through the plane cable spreading area;

[0071] S2: the front end main cable anchor head is hoisted and connected with the double-wire reciprocating traction system by the crawler crane, the main cable traction system is started, the cable strand is pulled to the terminal tunnel anchor and is anchored, and the preliminary cable spreading is completed;

[0072] S3: the remaining main cable strands in the cable disc are spread by the main cable aerial cable spreading method in stages, and the rear anchor head in the starting shore cable disc is taken out;

[0073] S4: after the rear anchor head in the starting shore cable disc is taken out, the main cable rear anchor head is hoisted and connected with the traction system in the tunnel anchor hole, is pulled into the hole by the hole traction system, and is pulled to the starting shore tunnel anchor and is anchored until the main cable is spread, and the whole main cable strand spreading operation is completed.

[0074] The main cable aerial cable spreading method in the step S3 can include:

[0075] (1) the main cable strand spreading is carried out by adopting a horizontal-vertical combination scheme, vertical cable spreading is mainly used, a vertical cable spreading area is arranged on the catwalk at the starting shore side, rotatable tow wheels are arranged at the two ends of the cable spreading opening of the section, the normal traction and lowering of the main cable are met, the catwalk downward cable spreading of the main cable strand is completed by cooperation of the first and second tower top hoists, a horizontal cable spreading channel is arranged on the starting shore tunnel anchor steel platform, and the main cable strand anchor head is pulled out by the auxiliary cable spreading of the multi-crane system; including the following specific steps:

[0076] Step one: the steel wire rope of the first tower top hoist is connected with the main cable strand at the marked position by the cable gripper, the steel wire rope is slowly reeled, and the traction is manually assisted until the cable gripper connected with the first tower top hoist reaches the cable spreading area position, and the first stage of cable spreading operation is completed; the marked position is a mark made in advance on the catwalk at a position 100 m away from the tower top;

[0077] Step two: remove the gripper, and manually assist the first tower winch wire rope to the marked position, and connect the main cable strand through the gripper again, the first tower winch continues to slowly collect the wire rope, the strand is vertically downward, and the second stage of the strand is completed.

[0078] Step three: the wire rope of the second tower winch is connected to the main cable strand at the marked position through the gripper, and slowly collects the wire rope, manually assists the main cable strand and the first tower winch wire rope to enter the vertical strand area together, until the gripper connected by the second tower winch reaches the strand area position, the vertically downward height of the strand increases, and the third stage of the strand is completed.

[0079] Step four: remove the gripper, manually pull the second tower winch wire rope to the marked position, connect the main cable strand through the gripper again, and the second tower winch continues to slowly collect the wire rope, and manually assists the main cable and the first tower winch wire rope to enter the strand area, until the gripper connected by the second tower winch is pulled to the strand area position, the vertically downward height of the strand continues to increase, and the remaining strand is completed.

[0080] Step five: the whole strand is completed by using a crane to take out the rear anchor head in the cable tray.

[0081] (2) Multi-crane cyclic lifting strand scheme: according to the construction site conditions and the length of the strand to be expanded, different arm length, different tonnage crawler cranes, automobile cranes and different height tower cranes are arranged in the starting shore downstream main cable strand field, which are connected to the lifting points of the strand respectively and cooperated with each other to slowly lift the strand to complete the expansion of the main cable of different lengths. The specific steps can include:

[0082] Step one: connect the crawler crane wire rope with the set lifting point of the main cable strand, slowly lift the strand to the plane strand area, and the strand is completely separated from the strand track, and the first stage of the remaining main cable in the cable tray is completed.

[0083] Step two: use the automobile crane to connect and lift at the set lifting point of the main cable strand, slowly lift the strand to complete the second stage of the strand.

[0084] Step three: use the tower crane to connect and lift at the strand lifting point of the main cable strand, slowly lift the strand to take out the main cable anchor head from the cable tray, complete the remaining strand expansion, and take out the rear anchor head in the starting shore cable tray.

[0085] As shown in Figure 2 , in this embodiment, three kinds of cranes are used to cooperate and cyclically lift to expand the main cable in the air, and different combinations of crane expansion schemes can be selected according to the length of the required strand and the space of the site.

[0086] Example 3:

[0087] The technical scheme of the aerial cable stretching method of the present application is further illustrated by the following embodiment 3. The main cable stretching of the present embodiment is for a main cable of a super large bridge across a river in a project, and the main cable strand is stretched by a planar and vertical combination scheme, with vertical stretching as the main method. The vertical stretching is performed on the catwalk at the starting bank, and the catwalk vertical stretching cable length is 74 m. The main cable stretching area is set on the catwalk, and the length is 36 m. The planar stretching is performed on the tunnel anchor hole platform at the starting bank, and the planar stretching length is 18 m. The planar stretching is performed by a crane, and the planar stretching length is 20 m. The total planar stretching length is 38 m, of which 18 m is completed on the platform during the main cable traction. The specific steps are as follows:

[0088] As Figure 3 Step 1 of the catwalk downward stretching of the present embodiment:

[0089] S101: The main cable strand is pulled from the starting bank to the terminal tunnel anchor saddle section by using a double-line reciprocating traction system. The remaining main cable length in the main cable reel is 114 m.

[0090] S102: The main cable strand is pulled to the front anchor surface by using the terminal tunnel anchor saddle section, and the chain is connected to the anchor. In this state, the remaining cable length in the starting bank reel is 96 m, and the catwalk vertical stretching area is perpendicular to the catwalk advancing direction.

[0091] S104: The mark is made on the catwalk at a position 100 m away from the tower top. The first tower top winch and the φ24 mm steel wire rope are connected to the main cable strand at the mark position by using a cable gripper.

[0092] S105: The rotating towboat in the stretching area is turned to be parallel to the catwalk advancing direction.

[0093] S106: The first tower top winch slowly retracts the steel wire rope, and the operation personnel assist in pulling the main cable into the vertical stretching area.

[0094] S107: The first tower top winch pulls 19 m. At this time, the No. 1 winch connected to the cable gripper has been pulled to the stretching area position, and the first stage stretching is completed. In this state, 19 m of the cable has been stretched.

[0095] As Figure 4 Step 2 of the catwalk downward stretching of the present embodiment:

[0096] S201: The cable gripper is removed, and the first tower top winch steel wire rope is manually pulled to the mark position. The φ24 mm steel wire rope of the first tower top winch is connected to the main cable strand by using a cable gripper.

[0097] S202: The rotating towboat in the stretching area is turned to be parallel to the catwalk advancing direction.

[0098] S203: The first tower top winch slowly retracts the steel wire rope, and the operating personnel assist in pulling the main cable into the vertical cable spreading area at the spreader opening area, to complete the second stage of cable spreading. In this state, 38 m of cable spreading has been completed, and the vertical height of the cable strand is about 32 m.

[0099] As Figure 5 Step three of the downward cable spreading of the catwalk of the present embodiment:

[0100] S301: The φ24 mm steel wire rope of the second tower top winch is connected to the main cable strand at a position 100 m away from the tower top by means of a cable gripper.

[0101] S302: The second tower top winch slowly retracts the steel wire rope, and the operating personnel assist in pulling the main cable into the cable spreading area.

[0102] S303: The second tower top winch is pulled for 19 m, at which time the cable gripper connected to the second tower top winch has been pulled to the cable spreading area position, to complete the third stage of cable spreading. In this state, 57 m of cable spreading has been completed, and the vertical height of the cable strand is about 41 m.

[0103] As Figure 6 Step four of the downward cable spreading of the catwalk of the present embodiment:

[0104] S401: The cable gripper is removed, and the second tower top winch steel wire rope is manually pulled to the marked position.

[0105] S402: The φ24 mm steel wire rope of the second tower top winch is connected to the main cable strand by means of a cable gripper.

[0106] S403: The second tower top winch slowly retracts the steel wire rope, and the operating personnel assist in pulling the main cable into the cable spreading area.

[0107] S404: The second tower top winch is pulled for 19 m, at which time the cable gripper connected to the second tower top winch has been pulled to the cable spreading area position, to complete the fourth stage of cable spreading. In this state, 76 m of cable spreading has been completed, and the vertical height of the cable strand is about 52 m.

[0108] S405: After the vertical cable spreading is completed, the remaining cable strand length in the main cable reel is 20 m. A horizontal cable spreading crane is used to take out the rear anchor head and hoist it to the starting shore cave opening pulling system, and the cable hoist in the starting shore cave is used to pull it into the cave.

[0109] Example 4:

[0110] As Figure 7The diagram shown illustrates the cable laying process assisted by a truck crane in this embodiment: After the upstream main cable is pulled to the anchorage at the terminal bank, the remaining length of the main cable strands in the cable reel is 114m, requiring cable laying to pull out the anchor head of the main cable strands. In this embodiment, a crawler crane and a truck crane are used in conjunction for cable laying. One 150t crawler crane and one 30t truck crane are arranged in the upstream main cable laying area, with the 150t crawler crane having a boom length of 52m and the 30t truck crane having a boom length of 40m. The specific cable laying steps are as follows:

[0111] Step 1: Connect the 150t crawler crane wire rope to the lifting point set on the main cable strand, and slowly lift the cable strand until it is completely detached from the cable spreading track in the planar cable spreading area. In this state, 80m of cable spreading 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 strands at the designated lifting point. Slowly lift the strands until the main cable anchor head is removed from the cable reel, completing the cable extension of 32m. The maximum lifting weight of the truck crane is 0.6t.

[0113] Step 3: Simultaneously swing the booms of the crawler crane and the truck crane to the right to connect the main cable anchor head to the tunnel traction system. The truck crane slowly releases its hook, while the tunnel traction system pulls inward in sync, disconnecting the truck crane's connecting wire rope.

[0114] Step 4: The crawler crane, in conjunction with the tunnel traction system, slowly releases the hook until the main cable is fully pulled into the starting bank tunnel anchor.

[0115] Example 5:

[0116] like Figure 8 The diagram shown illustrates the crane-assisted cable deployment in this embodiment. This embodiment is the downstream cable deployment scheme of Embodiment 5. After the downstream main cable is pulled to the anchorage at the terminal bank, the remaining main cable strand length is 83m. Cable deployment is required to pull out the main cable strand anchor head. One 100t crawler crane and one 30t truck crane are arranged in the downstream main cable laying area. The 100t crawler crane has a boom length of 39m, and the 30t truck crane has a boom length of 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 for the first cable extension, completing 54m of cable extension.

[0118] Step 3: Use a 30t truck crane for the second cable extension, extending the cable to 29m. After the cable extension is completed, swing the crawler crane boom to the left and hoist the main cable anchor head into the tunnel traction system.

[0119] Step 4: The truck crane and crawler crane simultaneously swing their booms to the left to hoist the main cable anchor head into the tunnel traction system. The crawler crane slowly lowers its hook, and the tunnel traction system simultaneously pulls it. The crawler crane hook is released, and the truck crane hook is slowly lowered and released, completing the main cable deployment.

[0120] Example 6:

[0121] As Figure 9 shown, it is a tower crane auxiliary cable-stayed diagram of the embodiment, the embodiment of the application and the difference of example 3 is that the tower crane auxiliary cable-stayed is used, after the upstream main cable is pulled to the terminal shore into the anchor, the remaining main cable length is 114m, and the main cable anchor head needs to be pulled out. The upstream main cable is arranged in the cable-stayed field 1 150t crawler crane and 1 WA7025 tower crane, wherein the 150t crawler crane arm length is 52m, and the tower crane arm length is 35m. The specific cable-stayed steps are as follows:

[0122] Step one: connect the 150t crawler crane wire rope with the set lifting point of the main cable, slowly lift the cable to the plane cable-stayed area, and the cable is completely separated from the cable-stayed track, which has completed the cable-stayed 60m.

[0123] Step two: use the tower crane to connect and lift at the set lifting point of the main cable, slowly lift the cable to the main cable anchor head from the cable reel, complete the cable-stayed 54m.

[0124] Step three: the crawler crane arm swings right, the tower crane arm swings left, the main cable anchor head is connected with the hole pulling system, the tower crane slowly releases the hook, and the hole pulling system synchronously pulls inward, and the tower crane connection wire rope is removed.

[0125] Step four: the crawler crane cooperates with the hole pulling system to slowly release the hook until the main cable is completely pulled into the starting shore tunnel anchor.

[0126] According to the above examples, the main cable aerial cable-stayed method can be selected according to the site conditions, construction space and the length of the cable-stayed cable to realize the rapid, efficient and safe construction of the suspension bridge.

[0127] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of aerial catenary for a bridge main cable, characterized in that, The method comprises the following specific steps: S1: adopt the crawler crane to hoist the cable disc to the cable laying frame, and use the crawler crane to hoist the front end anchor head and connect the small circulation traction system on the platform, start the small circulation traction system, and pull the cable strand to the catwalk through the plane cable laying area; S2: adopt the crawler crane to hoist the front end main cable anchor head and connect the double-wire reciprocating traction system, start the main cable traction system to pull the cable strand to the terminal anchor and anchor, and complete the preliminary cable laying; S3: adopt the main cable aerial cable laying method to lay the remaining main cable strand in the cable disc in stages, and take out the rear anchor head in the starting shore cable disc; The main cable aerial cable laying method comprises a catwalk downward cable laying scheme: the main cable strand is laid by adopting a horizontal-vertical combination scheme, vertical cable laying is mainly used, vertical cable laying is carried out on the vertical cable laying area on the catwalk on the starting shore, the tower top winch is used to complete the catwalk downward cable laying of the main cable strand, and the anchor head of the main cable strand is pulled out on the horizontal cable laying channel on the starting shore tunnel anchor hole platform by using a multi-crane system to assist cable laying. Further, the multi-crane circulation lifting cable laying scheme comprises the following steps: S4: after the rear anchor head in the starting shore cable disc is taken out, the main cable rear anchor head is hoisted and connected with the traction system in the tunnel anchor hole, the hole traction system is used to pull into the hole, until the main cable is pulled into the starting shore tunnel anchor and anchored, and the whole main cable strand laying operation is completed.

2. A method of aerial catenary for a bridge main cable according to claim 1, characterized in that, The catwalk downward cable laying scheme comprises the following steps: Step one: the steel wire rope of the first tower top winch is connected with the main cable strand at the marked position through a cable gripper, the steel wire rope is slowly reeled in, manual assistance is used to pull until the cable gripper connected with the first tower top winch reaches the cable laying area position, and the first stage of cable laying is completed; Step two: the cable gripper is removed, the steel wire rope of the first tower top winch is manually pulled to the marked position, the main cable strand is connected with the cable gripper again, the first tower top winch continues to slowly reel in the steel wire rope, the main cable strand vertically drops, and the second stage of cable laying is completed; Step three: the steel wire rope of the second tower top winch is connected with the main cable strand at the marked position through a cable gripper, the steel wire rope is slowly reeled in, the main cable strand and the steel wire rope of the second tower top winch are manually pulled into the vertical cable laying area together, until the cable gripper connected with the second tower top winch reaches the cable laying area position, the vertical dropping height of the main cable strand increases, and the third stage of cable laying is completed; Step four: the cable gripper is removed, the steel wire rope of the second tower top winch is manually pulled to the marked position, the main cable strand is connected with the cable gripper again, the second tower top winch continues to slowly reel in the steel wire rope, the main cable strand and the steel wire rope of the second tower top winch are manually pulled into the cable laying area, until the cable gripper connected with the second tower top winch is pulled to the cable laying area position, the vertical dropping height of the main cable strand continues to increase, and the remaining cable laying operation is completed; Step five: the rear anchor head in the cable disc is taken out by using the crawler crane to complete the whole cable laying operation.

3. A method of aerial catenary for a bridge main cable according to claim 2, wherein The catwalk downward cable laying scheme further comprises the following steps before step one: a mark is made on the catwalk at a position 100 m away from the tower top.

4. The method of claim 1, wherein, The specific steps of the multi-crane cyclic lifting and cable-stayed scheme include: Step 1: connecting the steel wire rope of the crawler crane with the set lifting point of the main cable strand, slowly lifting the strand to the plane cable-stayed area, and completely separating the strand from the cable-stayed track to complete the first-stage cable-stayed of the remaining main cable strand in the cable drum; Step 2: connecting and lifting the strand at the set lifting point of the main cable strand by using the truck crane, slowly lifting the strand to complete the second-stage cable-stayed; Step 3: connecting and lifting the strand at the cable-stayed lifting point of the main cable strand by using the tower crane, slowly lifting the strand to the main cable anchor head from the cable drum to complete the cable-stayed of the remaining strand, and taking out the rear anchor head in the initial shore cable drum.

5. A bridge main cable aerial cable-stayed system for realizing the bridge main cable aerial cable-stayed method according to any one of claims 1-4, comprising a main cable cable-stayed device, a multi-crane system and an auxiliary assembly, wherein, the main cable cable-stayed device comprises a double-line reciprocating traction system for preliminary cable-stayed, a first tower top winch (1) and a second tower top winch (2) for cooperating with the main cable lowering during the vertical cable-stayed of the catwalk, which are fixed on the tower top gantry (8) at the top of the main tower (7), a turning gantry (3), a rotating tugger (4) installed on the catwalk, a steel wire rope (5) connecting the main cable strand (6) and the first tower top winch (1) and the second tower top winch (2), and a cable gripper, and an in-hole traction system arranged in the tunnel anchor; the multi-crane system comprises crawler cranes (14), truck cranes (15) and tower cranes (16) with different arm lengths and tonnages for cooperating with the cable-stayed; the auxiliary assembly comprises a cable-stayed frame and a small-cycle traction system.

6. A bridge main cable aerial catenary system according to claim 5, characterised in that, A main cable vertical cable-stayed area (9) is arranged on the initial shore catwalk, and the turning gantry (3) is installed on the main cable vertical cable-stayed area (9) for guiding the main cable strand (6) to the required direction.

7. A bridge main cable aerial catenary system according to claim 6, characterised in that, The density of the rotating tugger (4) is increased near the main cable vertical cable-stayed area (9), a tugger encryption area (10) is arranged, and the vertical curve of the tugger at the cable-stayed opening of the main cable vertical cable-stayed area (9) is smoothly transitioned.

8. A bridge main cable aerial catenary system according to claim 7, characterised in that, A tunnel anchor hole platform (11) is arranged on the initial shore downstream, and the main cable strand cable drums are stored in the tunnel anchor hole platform (11).

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