Rapid traction method and system for main cable

Abstract

The invention discloses a main cable rapid traction method and system, and the method comprises the steps: arranging a traction winch and a main cable traction cable on a platform of a tunnel anchor portal of a starting bank, arranging in-tunnel traction systems in tunnel anchors on two banks, and completing the erection of the traction systems: arranging a cable disc beside a catwalk surface of the tunnel anchor portal of the starting bank, and rotating a cable strand into the catwalk surface through a steering wheel, pulling the cable strand by using an intelligent pulling device until a terminal bank tunnel anchor is reached; a main traction system is used for carrying out secondary dragging traction on a main cable passing section in the hole, then a traction system in a terminal bank hole is used for carrying out relay traction in the hole, and a cable strand anchor head is pulled to the front anchor face of a terminal bank anchor plug body and temporarily anchored; a tower crane, a crawler crane and a truck crane are matched to unfold a cable disc, and a cable head of a main cable strand on the cable disc is moved out; a traction system in the initial bank hole is used for pulling a cable strand head to the front anchor face of the anchor plug body, temporary anchoring is conducted, and traction is completed; by optimizing the traction system assembly and layout, the structure of the traction system is simplified, and the traction efficiency of the main cable strand is improved.

Description

Technical Field

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

[0002] In the field of bridge construction, especially during the construction of long-span suspension bridges, the erection of main cable strands is one of the key links. As the main load-bearing structure of a suspension bridge, the erection accuracy and efficiency of the main cable strands directly affect the overall quality and construction period of the bridge. The erection of main cable strands mainly adopts the parallel wire strand (PPWS) method, and the traction system is the core equipment for realizing the strand erection. In the prior art, the rapid main cable traction system is widely used, which realizes the reciprocating traction of the strands through two traction ropes and a winch. For example, in the patent document with the application number CN202311044578.2, the invention provides a reciprocating traction system, including two sets of longitudinal main cable rapid traction systems and a set of horizontal main cable rapid traction system arranged on one side of the anchor; the two longitudinal main cable rapid traction systems are respectively arranged on the upstream side and the downstream side, and the horizontal main cable rapid traction system is connected and arranged at one end of the two longitudinal main cable rapid traction systems; the horizontal main cable rapid traction system includes a first towing track, a second towing track, a first horizontal traction mechanism, a second horizontal traction mechanism, and a horizontal traction machine; the first towing track and the second towing track are arranged staggeredly; this invention can realize the turning of the main cable strands without a tower crane, reducing the project duration and labor cost increased by the tower crane, and this invention has a low tonnage requirement for the horizontal traction machine for horizontally traction the main cable strands, which can reduce the equipment investment cost; the method of this invention can realize the simultaneous turning and traction of two main cable strands, improving the traction efficiency. However, this invention adopts two sets of longitudinal main cable rapid traction systems and a set of horizontal main cable rapid traction system, with a relatively complex structure and cumbersome operation, which affects the traction efficiency, and the installation and maintenance costs are relatively high. Summary of the Invention

[0003] Aiming at the above defects or improvement requirements of the prior art, the present invention provides a method and system for rapid main cable traction. By optimizing the components and layout of the main traction system and the in-tunnel traction system, the structure of the traction system is simplified, the traction efficiency of the main cable strands is improved, the construction time and cost are reduced, and at the same time, the safety and reliability of the construction are ensured.

[0004] To achieve the above object, according to one aspect of the present invention, the present invention provides a method for rapid main cable traction, characterized by including the following specific steps:

[0005] S100: Arrange a traction winch and a main cable traction cable on the platform at the starting bank tunnel anchor hole entrance. At the same time, install an in-tunnel traction system in the tunnel anchors on both banks to provide a basis for the subsequent traction of the main cable strands, and complete the erection of the traction system, forming two independent small-loop double-line reciprocating traction systems on the upstream and downstream sides of the starting bank respectively:

[0006] S200: Through strand traction, strand shaping, strand saddling, strand anchoring, and strand fixing, pull the reference strand from the starting bank to the ending bank and fix it to complete the erection of the reference strand;

[0007] The strand traction steps include:

[0008] S201: Place the cable reel and the cable unreeling rack beside the catwalk surface at the starting bank tunnel anchor hole entrance. The strand passes through horizontal and vertical turning wheels and enters the catwalk surface; use the intelligent puller of the main traction system to conduct strand traction, passing through the starting bank tunnel anchor hole entrance, the starting bank tower top, the ending bank tower top, the ending bank tunnel anchor hole entrance, and the front end of the spreader saddle portal frame in the saddle chamber section of the ending bank tunnel anchor in sequence;

[0009] S202: Convert the traction method. First, use the main traction system to conduct secondary pulling traction for the in-tunnel main cable passing section, and then use the in-tunnel traction system at the ending bank to conduct in-tunnel relay traction. Pull the strand anchor head to the front anchor face of the anchor plug body at the ending bank and then conduct temporary anchoring;

[0010] S203: On the platform at the starting bank tunnel anchor hole entrance, use tower cranes, crawler cranes, and truck cranes in cooperation to conduct out-of-tunnel strand spreading for the strands not released in the cable reel, and move out the strand heads of the main cable strands on the cable reel;

[0011] S204: Convert the traction method. Use the in-tunnel traction system at the starting bank to pull the strand head from the support at the starting bank tunnel anchor hole entrance to the front anchor face of the anchor plug body and then conduct temporary anchoring;

[0012] S300: According to the erection process of the reference strand, sequentially complete the traction, shaping, saddling, anchoring, and fixing of other strands until all strands are erected to form a complete main cable structure.

[0013] Furthermore, the step S100 includes the following steps:

[0014] S101: Arrange 2 traction winches respectively at the upstream and downstream tunnel anchor hole platforms of the starting bank, and store the main cable strand reels at the upstream and downstream tunnel anchor hole platforms;

[0015] S102: Install an in-tunnel traction system in the tunnel anchors on both banks respectively. The winches of the in-tunnel traction system at the starting bank are distributed on both sides of the tunnel anchor hole entrance, and the winches of the in-tunnel traction system at the ending bank are arranged in the main cable passing section.

[0016] S103: The main cable traction cable passes through the winches, horizontal and vertical turning wheels of the traction systems in the tunnels on both banks, and then reaches the saddle portal frame of the tunnel anchor. After turning, it is pulled into the front anchor face to form a traction system.

[0017] Further, during the traction process of the cable strands, the traction speed of the main cable strands is controlled at 20 - 30 m / min. At the curve change points such as saddles, the running speed should be appropriately reduced and run at a speed of 4 - 6 m / min.

[0018] Further, during the traction process of the cable strands, the two traction winches of a single set of main traction systems should be synchronized, with the same retracting and releasing speeds, and the passive traction winch should always maintain a certain reverse pulling force.

[0019] Further, the step S200 further includes the following steps:

[0020] S205: After the main cable strands are traction-expanded between the two towers and two anchors, lift and laterally move the cable strands to the designed positions and perform shaping.

[0021] S206: Place the shaped cable strands into the corresponding saddle grooves of the main and dispersion saddles. After adjusting the cable strands, tap and compact them with a rubber mallet, and use inlayable wooden blocks to increase friction. Place zinc blocks in the partition grooves of the saddles and press them tightly with a jack.

[0022] S207: Use a winch to lower the anchor head to the corresponding position. The winch in the anchor chamber pulls the anchor head of the cable strand in the opposite direction, and connect the anchor heads at both ends of the cable strand to the anchoring system. After adjusting the sag of the cable strand, fill and press the zinc blocks, install the cover plate, tighten the tie rod, and perform permanent protection.

[0023] Further, use the winches on the saddle portal frame of the tunnel anchor and the tower top portal frame to cooperate with a pulley block of no less than 40 t for the lifting and lateral movement operations of the cable strands.

[0024] Further, when shaping the cable strands in step 205, first adjust the position of the colored marking wires. Use the cable strand steel sheet fork and hexagonal clips to clamp the cable strands, then slide the clips to make them into a regular hexagon, and then use the cable strand steel sheet fork and quadrilateral shaping tool to adjust them to the normal position and square state.

[0025] Further, the sequence of the cable strands entering the saddle in step 206 is: first the main saddle, then the dispersion saddle. At the main saddle, it is from the side span side to the mid-span side, and at the dispersion saddle, it is from the anchor span side to the tower side direction.

[0026] According to another aspect of the present invention, the present invention provides a main cable rapid traction system for the main cable rapid traction method described above, which is characterized in that it includes a main traction system and an in-tunnel traction system. The main traction system includes a main cable traction cable, a traction winch, an intelligent puller, a supporting wheel, a turning wheel, a tower top guide wheel, and a strand guide frame, and is used to realize the traction of the main cable strand from one end to the other end; the in-tunnel traction system includes a tunnel anchor cable saddle gantry, an in-tunnel traction cable, an in-tunnel winch, an in-tunnel turning wheel, and a traction pulley, and is used to pull the main cable strand into the tunnel anchor for anchoring.

[0027] Furthermore, the intelligent puller has a tension monitoring function and can monitor and control the traction speed and tension of the main cable strand in real time; the tower top guide wheels are arranged at the top of the main tower, and there are two on each side of the tower top to optimize the traction line shape; near both sides of the main tower saddle, the arrangement of the supporting wheels is densified, and the vertical curve of the supporting wheel (14) is made smooth.

[0028] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0029] 1. The main cable rapid traction system of the present invention adopts an independent small-loop double-line reciprocating traction system, and friction-type traction winches are respectively arranged on the upstream side and the downstream side of the starting bank. The winches are on the same bank, and the transmission distance is short, reducing the materials and equipment required for construction, and enabling efficient two-way synchronous traction, greatly improving the traction speed.

[0030] 2. The main cable rapid traction system of the present invention adopts an intelligent puller with a tension monitoring function. It can not only connect the front anchor head of the strand with the main cable traction cable to realize the effective traction of the main cable strand, but also has a tension monitoring function, can monitor and control the traction speed and tension of the main cable strand in real time, and automatically adjust the traction speed and tension according to the actual stress situation of the strand, avoiding strand damage caused by human operation errors or excessive traction force, making the traction process safer and more reliable, and greatly improving the success rate and safety of the traction operation.

[0031] 3. The main cable rapid traction system of the present invention sets two guide wheel groups on each side of the tower top. The bending radius of the strand when passing through the tower top increases, which can significantly improve the line shape of the main cable traction cable, making the traction line shape smoother, the local stress distribution more uniform, thereby effectively reducing the wear of the strand and extending the service life of the strand. At the same time, the smooth line shape makes the dynamic stability of the strand better when passing through the tower top, avoiding safety accidents caused by strand swinging or twisting. Therefore, it is not only beneficial to the protection of the strand, but also can significantly improve the safety of the traction process.

[0032] 4. The main cable rapid traction system of the present invention can significantly improve the traction efficiency of the main cable strands by arranging two groups of supporting wheel sets and two intelligent pulling devices on both the upstream and downstream sides. It realizes the double-line reciprocating traction of the main cable strands. When the main cable strands on one side are pulled to the opposite bank, the intelligent pulling device on the other side can be immediately started to carry out the traction operation of the next main cable strand without waiting for equipment adjustment, greatly shortening the total time of the traction operation and improving the construction efficiency.

[0033] 5. The main cable rapid traction system of the present invention reduces the space required during the cable spreading process by optimizing the layout of the cable spreading equipment of the multi-crane system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall traction method and erection process of the main cable strands in the embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the process flow of the main cable strand traction method in the embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of the layout of the main cable strand traction system in the embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of the cable reel cable releasing and cable strand guiding frame in the embodiment of the present invention;

[0038] Figure 5 It is a schematic diagram of the layout of the in-tunnel traction system in the tunnel anchor in the embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of four steps of the main cable strand traction in the embodiment of the present invention;

[0040] Figure 7 It is a schematic diagram of the cable spreading tower crane and crawler crane in the embodiment of the present invention.

[0041] In all the drawings, the same reference numerals represent the same technical features. Specifically: 1 - main traction system, 11 - main cable traction cable, 12 - traction winch, 13 - intelligent pulling device, 14 - supporting wheel, 15 - turning wheel, 16 - tower top guide wheel, 2 - in-tunnel traction system, 21 - tunnel anchor cable saddle gantry, 22 - in-tunnel traction cable, 23 - in-tunnel winch, 24 - drum, 3 - main cable strand, 4 - tunnel anchor portal platform, 5 - cable strand anchor head, 6 - cable reel, 7 - main tower, 8 - portal turning gantry, 9 - tower crane, 10 - crawler crane. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention 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 invention and are not used 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.

[0043] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] In the description of the present invention, unless otherwise clearly defined 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 integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0047] Embodiment 1

[0048] This embodiment provides a method for quickly towing the main cable. In this embodiment, taking a double-tower suspension bridge as an example, the bank where the cable reel is placed is recorded as the starting bank, and the other bank is the ending bank. Tunnel anchors are used on both banks. Figure 1-2 The following is a flowchart of a method for quickly towing the main cable provided by the embodiments of the present application. The method includes the following specific steps:

[0049] S100: Arrange the traction winch and the main cable traction cable on the platform at the entrance of the tunnel anchor on the starting bank. At the same time, install the in-tunnel traction system in the tunnel anchors on both banks to provide the basis for the subsequent traction of the main cable strands and complete the erection of the traction system, forming two independent small-loop double-track reciprocating traction systems on the upstream and downstream sides of the starting bank respectively;

[0050] The step S100 includes the following steps:

[0051] S101: Arrange 2 traction winches at the platforms at the entrances of the upstream and downstream tunnel anchors on the starting bank respectively, and store the main cable strand reels at the platforms at the entrances of the upstream and downstream tunnel anchors;

[0052] S102: Install a set of in-tunnel traction systems in the tunnel anchors on both banks. The winches of the in-tunnel traction system on the starting bank are distributed on both sides of the tunnel anchor entrance, and the winches of the in-tunnel traction system on the terminal bank are arranged in the main cable passing section.

[0053] S103: The main cable traction cable passes through the winches, horizontal and vertical turning wheels of the in-tunnel traction systems on both banks and then reaches the cable saddle gantry on the tunnel anchor, and then turns and is pulled into the front anchor face to form the traction system.

[0054] S200: Through strand traction, strand shaping, strand entering the saddle, strand entering the anchor and strand fixing, pull the reference strand from the starting bank to the terminal bank and fix it to complete the erection of the reference strand; the specific steps are as follows:

[0055] S201: Place the strand reel and the strand releasing frame beside the catwalk surface at the entrance of the tunnel anchor on the starting bank. Use the crawler crane to lift the strand reel, install the strand reel on the strand releasing frame, and pull out the front anchor head of the strand. Use the crane to lift and pass the anchor head through the strand guiding frame and connect it to the intelligent puller of the traction system for strand traction. Under the traction of the intelligent puller of the strand anchor head, the strand comes out of the strand reel, passes through the strand guiding frame and the idler wheels, and successively passes through the entrance of the tunnel anchor on the starting bank, the top of the starting bank tower, the top of the terminal bank tower, the entrance of the tunnel anchor on the terminal bank, and the front end of the cable saddle gantry in the cable saddle section of the terminal bank tunnel anchor; near both sides of the main tower cable saddle, the arrangement of the strand idler wheels is densified, and the vertical curve of the strand idler wheels is smoothly transitioned.

[0056] The traction speed of the main cable strands is controlled at 20 - 30 m / min. At the curve change points such as the saddle, the running speed should be appropriately reduced and run at a speed of 4 - 6 m / min.

[0057] During the strand traction process by a single set of traction systems, the two traction winches should be synchronized, with the same winding and unwinding speeds, and the passive traction winch should always maintain a certain reverse tension.

[0058] S202: Convert the traction method. First, use the main traction system to conduct secondary pulling traction for the section of the main cable passing through the tunnel, and then use the in-tunnel traction system at the terminal bank to conduct relay traction in the tunnel (front anchor chamber section), and temporarily anchor the strand anchor head in front of the front anchor face of the terminal bank anchor plug body;

[0059] S203: On the platform at the entrance of the tunnel anchor on the starting bank, use the cooperation of tower cranes, crawler cranes and truck cranes to conduct out-of-tunnel cable spreading of the strands not released in the cable reel, and move out the strand heads of the main cable on the cable reel; In this embodiment, there are still main cable strands not released in the cable reel at the starting bank cable laying yard (114 m remaining upstream and 83 m remaining downstream). The upstream strand is lifted and spread for 114 m by using the tower crane 9 arranged at the tunnel entrance in cooperation with the 150 t crawler crane 10 (as Figure 7 shown), and the downstream strand is lifted and spread for 83 m by using the cooperation of the 150 t crawler crane and the 25 t truck crane.

[0060] S204: Convert the traction method. Use the in-tunnel traction system on the starting bank to pull the strand head from the support at the entrance of the tunnel anchor on the starting bank to the front anchor face of the anchor plug body and then conduct temporary anchoring. Specifically, use the in-tunnel traction system of the tunnel anchor to pull the main cable anchor head under the spreader saddle gantry, then replace the traction pulley, continue to pull it to the front anchor face, and use a chain block to cooperate for entering the anchor;

[0061] S205: After the main cable strands are traction-expanded between the two towers and two anchors, lift and horizontally move the strands to the designed position and conduct shaping;

[0062] The traction-completed main cable strands are placed on the catwalk carrier rollers. Since the strands are about 1.5 m lower than the designed position of the main cable and are carried out at a position about 2.2 m away from its center line during the traction erection process, use the winches on the spreader saddle gantry of the tunnel anchor and the tower top gantry to cooperate with a pulley block of no less than 40 t to conduct the lifting and horizontal movement operations of the strands;

[0063] When shaping the strands, first adjust the position of the colored marking wire, use the strand steel sheet fork and hexagonal clips to clamp the strands, then slide the clips to make them into a regular hexagon, and then use the strand steel sheet fork and quadrilateral shaping tool to adjust them to the normal position and square state.

[0064] S206: Place the shaped strands into the corresponding saddle grooves of the main and spreader saddles, adjust the strands and then tap and compact them with a rubber mallet, and use an inlaid wooden block to increase friction. Place zinc blocks in the saddle partition grooves and press them tightly with a jack;

[0065] The order of strand entry into the saddle is: first the main saddle, then the spreader saddle. At the main saddle, it is from the side span side to the mid-span side, and at the spreader saddle, it is from the anchor span side to the tower side direction;

[0066] S207: Lower the anchor head to the corresponding position using a winch. In the anchor chamber, use the winch to pull the strand anchor head in the opposite direction, and connect the anchor heads at both ends of the strand to the anchoring system through a tie rod.

[0067] S208: After adjusting the sag of the strand, remove the wedge-shaped wood in the saddle groove, fill it with zinc blocks, install the cover plate, tighten the tie rod, and finally perform permanent protection.

[0068] Among them, steps S201 - S204 are the strand traction steps. As Figure 5 is the schematic diagram of the strand traction step.

[0069] S300: According to the erection process of the reference strand, successively complete the traction, shaping, saddle entry, anchor entry and fixation of other strands until all strands are erected to form a complete main cable structure.

[0070] Embodiment 2

[0071] As Figure 2-6 shown, the embodiment of the present invention provides a main cable rapid traction system for implementing the main cable rapid traction method in Embodiment 1, including a main traction system 1 and an in-tunnel traction system 2. The main traction system 1 is used for the traction of the main cable strands, and the in-tunnel traction system 2 is used to pull the main cable strands into the tunnel anchor for anchoring. Among them, the main traction system 1 includes a main cable traction cable 11, a traction winch 12, an intelligent puller 13, a supporting wheel 14, a turning wheel 15, a tower top guide wheel 16 and a strand guide frame. Among them,

[0072] The main cable traction cable 11 uses a φ36mm (6×36WS+IWR) steel wire rope as the carrier for pulling the main cable strand 3, connects the traction winch 12 and the main cable strand 3, bears the traction force, and pulls the main cable strand 3 from one end to the other end.

[0073] The traction winch 12 is a 30t friction-type traction winch, which is respectively arranged at the upstream tunnel anchor entrance platform 4 and the downstream tunnel anchor entrance platform 5 of the suspension bridge, and is used to pull the main cable traction cable 1, provide the traction force, and drive the traction of the main cable strand 3.

[0074] The intelligent puller 13 is used to connect the strand anchor head 6 and the main cable traction cable 1, pull the main cable strand 3, and it has a tension monitoring function, which can monitor and control the traction speed and tension of the main cable strand 3 in real time to ensure the safety of the main cable strand during the traction process.

[0075] The strand guide frame 4 is installed at the outlet of the cable reel 6 and is used to guide the main cable strand 5 out of the cable reel 6 and into the traction system to ensure that the strand smoothly enters the traction path;

[0076] The carrier rollers 14 are distributed in the catwalk and tunnel anchor saddle sections, including horizontal rollers and vertical rollers, and are used to support the main cable strands 3 and adjust their positions. The main cable strands 3 are towed to the top of the main tower 7 under the support of the carrier rollers 14 on the catwalk. On both sides of the cable saddle near the main tower 7, the arrangement of the carrier rollers 14 is densified to form a densified carrier roller area, and the vertical curve of the carrier rollers 14 is smoothly transitioned to ensure the smooth transition of the main cable strands 3 at the top of the tower.

[0077] The turning wheels 15 are arranged in the tunnel anchor saddle section and the portal turning gantry 8 at the entrance, including horizontal and vertical turning wheels, and are used to change the direction of the towing cable.

[0078] The top tower guide wheels 16 are arranged at the top of the main tower 7 to guide the main cable towing cable 11, optimize the towing alignment. Two of the top tower guide wheels 8 are used on both sides of the top of the tower, making the towing alignment smoother, reducing the wear and stress concentration of the main cable strands 3 at the top of the tower, and improving the safety and stability of the towing process.

[0079] The in-tunnel towing system 2 is respectively arranged in the tunnel anchors on both banks, including the tunnel anchor cable dispersion saddle gantry 21, the in-tunnel towing cable 22, the in-tunnel winch 23, the in-tunnel turning wheels and the towing pulleys.

[0080] The tunnel anchor cable dispersion saddle gantry 21 is arranged at the tunnel anchor, supports the main cable strands, and disperses them into strands and anchors them on the anchor block respectively.

[0081] The in-tunnel towing cable 22 uses a φ24mm steel wire rope.

[0082] The in-tunnel winch 23 uses a 10t winch.

[0083] The main towing system 1 tows the main cable strands to the tunnel anchor cable dispersion saddle gantry 21 at the entrance of the tunnel anchor, and then the in-tunnel towing system 2 tows the main cable strands 3 into the tunnel anchor for anchoring. Through the cooperation of the in-tunnel winch 23 and the in-tunnel towing cable 22, the accurate towing and anchoring of the main cable strands 3 in the tunnel are realized.

[0084] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A main cable rapid pulling method, characterized in that: The specific steps include: S100: Arrange the traction winch and main cable traction rope on the tunnel anchor hole platform at the starting bank, and lay the tunnel traction system in the tunnel anchors on both sides to provide a basis for the subsequent main cable strand traction, complete the installation of the traction system, and form two independent small-circulation double-line reciprocating traction systems on the upstream and downstream sides of the starting bank respectively: S200: The reference cable strand is towed from the starting shore to the end shore and fixed by cable strand towing, cable strand shaping, cable strand saddle placement, cable strand anchoring and cable strand fixing, thereby completing the installation of the reference cable strand; The cable strand pulling step comprises: S201: The cable tray and the cable laying frame are arranged beside the catwalk surface at the anchor hole of the starting bank tunnel, and the cable strands are turned into the catwalk surface through the horizontal and vertical steering wheels; the cable strands are towed by the intelligent puller of the main traction system, and pass through the anchor hole of the starting bank tunnel, the tower top of the starting bank, the tower top of the terminal bank, the anchor hole of the terminal bank tunnel, and the front end of the cable saddle gantry of the anchor saddle room section of the terminal bank tunnel in sequence; S202: switching the traction mode, first using the main traction system to perform secondary pulling and traction of the main cable through the tunnel section, and then using the tunnel traction system at the terminal shore to perform relay traction in the tunnel, and then temporarily anchoring the cable strand anchor head after pulling it to the front anchor surface of the anchor plug body at the terminal shore; S203: On the tunnel anchor hole platform at the starting bank, use a tower crane, crawler crane and truck crane to spread the cables out of the hole where the cables are not released from the cable drum, and move the cable heads of the main cable strands on the cable drum out; S204: switching the traction mode, using the traction system in the starting bank tunnel to pull the cable strand and cable head from the starting bank tunnel anchor hole bracket to the front anchor surface of the anchor plug body for temporary anchoring; S300: According to the installation process of the reference cable strand, the pulling, shaping, saddle placement, anchoring and fixing of other cables are completed in sequence until all cables are installed to form a complete main cable structure.

2. A main cable rapid pulling method according to claim 1, characterized in that: The step S100 includes the following steps: S101: Arrange two traction winches at the upstream and downstream tunnel anchor opening platforms on the starting shore respectively, and store the main cable strands at the upstream and downstream tunnel anchor opening platforms; S102: a set of in-tunnel traction systems is respectively arranged in the tunnel anchors on both sides, the winches of the in-tunnel traction system on the starting bank are distributed on both sides of the tunnel anchor opening, and the winches of the in-tunnel traction system on the ending bank are arranged in the main cable passing section; S103: The main cable traction rope passes through the winches, horizontal and vertical steering wheels of the traction system in the tunnels on both sides and reaches the tunnel anchor saddle gantry, and then turns and is pulled into the front anchor surface to form a traction system.

3. A main cable rapid pulling method according to claim 1, characterized in that: During the cable strand traction process, the traction speed of the main cable strand is controlled at 20-30 m / min. At the change of the saddle curve, the running speed should be appropriately reduced to 4-6 m / min.

4. A main cable rapid pulling method according to claim 3, characterized in that: During the cable strand traction process, the two traction winches of the single main traction system should be kept synchronous, with the same retraction and release speeds, and the passive traction winch always maintains a certain counter-pulling force.

5. A main cable rapid pulling method according to any one of claims 1 to 4, characterized in that: The step S200 further includes the following steps: S205: After the main cable strands are pulled and deployed between the two towers and two anchors, the strands are lifted and moved horizontally to the designed position and shaped; S206: placing the shaped cable strands into the corresponding saddle grooves of the main and loose cable saddles, and after adjusting the cable strands, hitting and compacting them with a rubber hammer, and using a embeddable wooden block to increase friction, and placing a zinc block in the saddle partition groove and pressing it with a jack; S207: Use the winch to lower the anchor head to the corresponding position, and use the winch in the anchor room to pull the anchor head of the cable strand back, and connect the anchor heads at both ends of the cable strand to the anchoring system; after the verticality of the cable strand is adjusted, fill with zinc blocks, install the cover plate, and tighten the pull rod for permanent protection.

6. A main cable rapid pulling method according to claim 5, characterized in that: In step 205, the winches on the tunnel anchor cable saddle gantry and the tower top gantry are used in conjunction with a pulley group of no less than 40 tons to lift and move the cable strands horizontally.

7. A main cable rapid pulling method according to claim 6, characterized in that: When the cable strand is shaped in step 205, the position of the colored marking wire is first adjusted, the cable strand is clamped by a cable strand steel fork and a hexagonal clamp, and then the clamp is slid to shape it into a regular hexagon, and then the cable strand steel fork and a quadrilateral shaping tool are used to adjust it to a normal position and a square state.

8. A main cable rapid pulling method according to claim 7, characterized in that: In step 206, the order of cable strands entering the saddle is: main cable saddle first, then loose cable saddle, the main cable saddle is from the side span side to the middle span side, and the loose cable saddle is from the anchor span side to the tower side.

9. A main cable fast pulling system, used to implement a main cable fast pulling method according to any one of claims 1 to 8, characterized in that: The invention comprises a main traction system (1) and an in-tunnel traction system (2), wherein the main traction system (1) comprises a main cable traction rope (11), a traction winch (12), an intelligent puller (13), a supporting wheel (14), a steering wheel (15), a tower top guide wheel (16) and a cable strand guide frame, and is used to realize traction of the main cable strand (3) from one end to the other end; and the in-tunnel traction system (2) comprises a tunnel anchor saddle gantry (21), an in-tunnel traction rope (22), an in-tunnel winch (23), an in-tunnel steering wheel and a traction pulley, and is used to traction the main cable strand (3) into the tunnel anchor for anchoring.

10. A main cable rapid traction system according to claim 9, characterized in that: The intelligent puller (13) has a tension monitoring function and can monitor and control the traction speed and tension of the main cable strand (3) in real time; the tower top guide wheel (16) is arranged at the top of the main tower (7), and two are used on each side of the tower top to optimize the traction line shape; the arrangement of the supporting wheel (14) is increased on both sides of the main tower saddle, and the vertical curve of the supporting wheel (14) is smoothly transitioned.

Images