A parallel four-main-cable cross-cable crane and its use method

Abstract

The present invention relates to a parallel four-main-cable cable-spanning crane and a method for using the same. The parallel four-main-cable cable-spanning crane comprises a cable support and travel system, a hoisting system, a main truss (8) and a control system. The cable support and travel system and the hoisting system are both two, and the two cable support and travel systems are respectively arranged in parallel at both ends of the main truss (8) through the hoisting system. When the parallel four-main-cable cable-spanning crane provided by the present invention is used for a suspension bridge with a main cable in the form of parallel four main cables and double main cables arranged on one side, the main cables are balanced in force, the overall structure has a light deadweight, good stability, high controllability, and strong adaptability, thereby reducing the difficulty of hoisting operations of super-large span suspension bridges.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a parallel four-main-cable spanning cable crane and a use method thereof. Background Art

[0002] Suspension bridges have strong spanning capabilities due to their structural characteristics and are widely used in basic transportation construction. At present, the construction of many domestic suspension bridges over 2000m has been put on the agenda, and technical research and exploration of suspension bridges with a main span of 3000m has been carried out at home and abroad. For suspension bridges with a main span of over 2000m, if the conventional two main cables are used, the diameter of the main cable is very large and the construction is difficult. Therefore, the main cable can be set as a parallel four main cable and a single-side juxtaposed double main cable, which can not only improve the stress performance of the main cable, but also reduce the difficulty of main cable construction.

[0003] As a large-scale special equipment for lifting the stiffening beam of a suspension bridge, the cable-span crane has obvious advantages when the waterway has the conditions for water lifting operations. At present, the existing cable-span cranes are mainly in the form of double main cables, and the single-side single main cable bearing and walking method is not suitable for the lifting requirements of a four-main-cable suspension bridge. Therefore, it is necessary to provide a new type of cable-span crane that can be used for suspension bridges with parallel four main cables and single-side juxtaposed double main cables. Summary of the invention

[0004] The present invention provides a parallel four-main-cable cable-spanning crane and a method of using the same, aiming to overcome the problem in the prior art that a double-main-cable cable-spanning crane using a single-side single main cable for bearing and traveling is not suitable for the lifting requirements of a four-main-cable suspension bridge.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A parallel four-main-cable cross-cable crane comprises a cable support and traveling system, a hoisting system, a main truss and a control system. The cable support and traveling system and the hoisting system are both two, and the two cable support and traveling systems are respectively arranged in parallel at both ends of the main truss through the hoisting system.

[0007] Furthermore, the cable support and walking system includes two sets of walking mechanisms, a traction mechanism, a connecting shaft box and a parallel connection structure. The two sets of walking mechanisms are arranged in parallel and fixedly connected by the parallel connection structure. The upper ends of the two sets of walking mechanisms are also hinged to the connecting shaft box through a transverse pin shaft; the traction mechanism is arranged on the parallel connection structure.

[0008] Furthermore, the traction mechanism includes a traction steel strand jack, one end of which is fixed to the flat-jointed structure, and the other end is connected to a walking reaction frame arranged on the two main cables through a walking fixed anchor to provide reaction force support during walking.

[0009] Furthermore, the walking mechanism consists of a walking mechanism box, four walking wheel groups and three hoop bodies; the four walking wheel groups are longitudinally arranged in the walking mechanism box; the three hoop bodies are longitudinally installed at the bottom of the walking mechanism box, and each is located between two adjacent four walking wheel groups.

[0010] Furthermore, each of the travel wheel groups is composed of a travel roller and a load transfer cylinder; the four travel rollers are all located in the travel mechanism box, each travel roller is connected to a load transfer cylinder through a pin shaft, and the load transfer cylinder is fixedly connected to the top of the travel mechanism box.

[0011] Furthermore, the load transfer cylinder and the traveling mechanism box are connected by a flange.

[0012] Furthermore, the lifting system comprises a bearing structure, two sets of main jack lifting systems and a shoulder pole beam; the bearing structure is a "π"-shaped box structure, which is hinged to the connecting shaft box through a longitudinal pin shaft; the two sets of main jack lifting systems are symmetrically arranged on the bearing structure, and the main jack lifting system includes a main lifting jack and a matching steel strand wire take-up and a steel strand wire guide frame; the main lifting jack is fixed on the bearing structure, the steel strand wire take-up is located on the inner side of the main lifting jack, and the steel strand wire guide frame is arranged above the steel strand wire take-up, and the steel strand wire in the steel strand wire take-up extends from the bottom of the main lifting jack through the steel strand wire guide frame; the steel strand wires of the two sets of main jack lifting systems pass through the two ends of the bearing structure and are connected to the two ends of the shoulder pole beam respectively.

[0013] Furthermore, the main truss is composed of multiple truss segments to form a rectangular structure, the segment trusses are connected by pins, the truss ends and the end bearing structure are flange-connected, and the segment components of the main truss are connected by bolts.

[0014] Furthermore, the method for using the parallel four-main-cable cross-cable crane comprises the following specific steps:

[0015] Step 1: Install the cable support and walking system, lifting system and main truss at the predetermined position of the formed main cable, start the load transfer cylinder of the walking mechanism, move the walking roller up to the hoop body of the walking mechanism to support the top surface of the main cable, tighten the hoop body, and the piston of the load transfer cylinder continues to contract to separate the walking roller from the main cable;

[0016] Step 2: The main lifting jack of the hoisting system lowers the steel strand and connects the shoulder pole beam to the stiffening beam directly below the crane. Start the main lifting jack, lift the stiffening beam into place, and connect the stiffening beam to the sling to complete the force system conversion, and then release the connection between the shoulder pole beam and the stiffening beam.

[0017] Step 3: Start the load transfer cylinder of the traveling mechanism, the piston of the load transfer cylinder pushes out, the traveling roller moves down and is supported on the top surface of the main cable, the hoop body is opened, and the piston continues to push out, so that the traveling mechanism box drives other structures to leave the top surface of the main cable;

[0018] Step 4: Start the traction steel strand jack of the traction mechanism to move the span-cable crane forward as a whole to the predetermined position; when the walking roller moves to the cable clamp position, control the roller to move up to separate from the main cable, continue to start the traction steel strand jack to move the span-cable crane forward until the roller crosses the cable clamp, control the roller to move down and support it on the top surface of the main cable, and realize the function of the span-cable crane crossing the cable clamp by alternately raising and lowering the walking roller;

[0019] Step 5: Start the load transfer cylinder of the walking mechanism, the piston of the load transfer cylinder contracts, driving the walking mechanism box to move down and support it on the top surface of the main cable, tighten the hoop body of the walking mechanism, and the piston continues to contract to make the walking roller separate from the main cable;

[0020] Step 6: Repeat steps 2 to 5 until all stiffening beam sections are hoisted;

[0021] Step 7: Dismantle the main truss, lifting system, cable support and walking system in turn.

[0022] The parallel four-main-cable cross-cable crane provided by the present invention has the following advantages:

[0023] (1) The two sets of walking mechanisms on one side are connected by a parallel joint structure and are hinged to the connecting shaft box through a transverse pin. The end bearing structure is hinged to the connecting shaft box through a pin, which can release the rotation constraints of the whole machine in the longitudinal and transverse directions. The whole machine has good stability and strong adaptability.

[0024] (2) Two main lifting jacks on one side are symmetrically arranged on both sides of the end bearing structure, and the main cable is subjected to balanced force;

[0025] (3) The main truss only bears its own weight and the weight of the hydraulic pump station, control room, etc. The structural force is small and the lightweight design is adopted to reduce the weight of the whole machine;

[0026] (4) The main truss is composed of multiple truss segments. By appropriately adjusting the number of segments or modifying some segments, it can adapt to suspension bridges with different main cable spacings.

[0027] (5) The single-side double main cable bearing structure of the cable-spanning crane has good stability during hoisting and traveling.

[0028] Beneficial effects of the present invention: When a parallel four-main-cable cable-span crane provided by the present invention is used for a suspension bridge with parallel four-main-cables and single-side juxtaposed double main cables as the main cables, the main cables are subjected to balanced forces, the overall structure has a light weight, good stability, high controllability, and strong adaptability, thereby reducing the difficulty of hoisting operations on super-large span suspension bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a front view of the parallel four-main-cable cross-cable crane of the present invention;

[0030] Figure 2 It is a top view of the parallel four main cable spanning cable crane of the present invention;

[0031] Figure 3 This is a front view of the cable support and travel system of the present invention;

[0032] Figure 4 It is a side view of the cable support and walking system of the present invention.

[0033] Explanation of the reference numerals in the accompanying drawings: 1. Steel strand guide frame; 2. Steel strand take-up device; 3. Main lifting jack; 4. Bearing structure; 5. Steel strand; 6. Main cable; 7. Shoulder beam; 8. Main truss; 9. Hydraulic pump station; 10. Control room; 11. Connecting shaft box; 12. Load transfer cylinder; 13. Traveling mechanism box; 14. Traveling roller; 15. Hoop body; 16. Flat joint structure; 17. Traction steel strand jack; 18. Cable clamp; 19. Horizontal pin; 20. Pin; 21. Longitudinal pin; 22. Traveling fixed anchor; 23. Traveling reaction frame. DETAILED DESCRIPTION

[0034] Example 1

[0035] like Figures 1 to 4 As shown, the present invention provides a parallel four-main-cable cross-cable crane, including a cable support and traveling system, a hoisting system, a main truss 8 and a control system. The cable support and traveling system and the hoisting system are both two, and the two cable support and traveling systems are respectively arranged in parallel at both ends of the main truss 8 through the hoisting system.

[0036] Furthermore, the cable support and walking system includes two sets of walking mechanisms, a traction mechanism, a connecting shaft box 11 and a parallel structure 16. The two sets of walking mechanisms are arranged in parallel and fixedly connected by the parallel structure 16. The upper ends of the two sets of walking mechanisms are also hinged to the connecting shaft box 11 through a transverse pin shaft 19; the traction mechanism is arranged on the parallel structure 16.

[0037] Furthermore, the traction mechanism includes a traction steel strand jack 17, one end of which is fixed to the flat joint structure 16, and the other end is connected to a walking reaction frame 23 arranged on two main cables through a walking fixed anchor 22, so as to provide reaction force support during walking. The walking reaction frame is generally arranged at 4 to 5 cable clamps away from the hoisting position, and the cable clamps are tightened during installation.

[0038] Furthermore, the travel mechanism is composed of a travel mechanism box 13, four travel wheel groups and three hoop bodies 15; the four travel wheel groups are longitudinally arranged in the travel mechanism box 13; the three hoop bodies 15 are longitudinally installed at the bottom of the travel mechanism box 13, and are connected by bolts. The hoop position can be adjusted according to actual conditions to meet the precise positioning of the cable-mounted crane in the case of different lengths of cable clips 18. Each corresponding part is located between two adjacent four travel wheel groups.

[0039] Furthermore, each of the travel wheel groups is composed of a travel roller 14 and a load transfer cylinder 12; the four travel rollers 14 are all located in the travel mechanism box 13, and each travel roller 14 is connected to a load transfer cylinder 12 through a pin shaft 20, and the load transfer cylinder 12 is fixedly connected above the travel mechanism box 13.

[0040] Furthermore, the load transfer cylinder 12 and the travel mechanism box 13 are connected by flanges.

[0041] When the parallel four-main-cable cross-cable crane of the present invention is traveling, the clamp body 15 is opened, and the traveling rollers 14 are alternately raised and lowered to realize the function of crossing the cable clamp 18. The two sets of traveling mechanisms on one side are connected by a flat joint structure 16, and at the same time, the two sets of traveling mechanisms on one side are hinged to the connecting shaft box 11 by a transverse pin 19, which can release the rotation constraint of the connecting shaft box 11 along the direction of the main cable 6, ensuring that the end bearing structure 4 and the main truss 8 are always located in the vertical plane. The transverse pin 19 and the connecting shaft box 11 are connected by flange end faces, and the transverse pin 19 is inserted into the connecting shaft box 11 for a certain length, so that the connecting shaft box 11 and the pin 19 bear the bending moment together. The traction steel strand jack 17 is arranged at the center of the double main cables on one side, and the synchronization of the crane travel is easier to control in the case of multiple fulcrums.

[0042] Furthermore, the hoisting system comprises a bearing structure 4, two sets of main jack lifting systems and a shoulder beam 7; the bearing structure 4 is a "π"-shaped box structure, which is hinged with the connecting shaft box 11 through the longitudinal pin 21, and can release its rotation constraint in the transverse direction of the bridge, so as to eliminate the adverse effect of the single-side juxtaposed double main cable erection error on the main bearing structure of the crane, and minimize the additional bending moment generated by the main truss 8 of the crane. The outer side of the longitudinal pin 21 is fixed with double round nuts, which can withstand large axial forces. Two sets of main jack lifting systems are symmetrically arranged on the bearing structure 4, and the main jack lifting system includes a main lifting jack 3 and a matching steel strand take-up device 2 and a steel strand guide frame 1; the main lifting jack 3 is fixed on the bearing structure 4, the steel strand take-up device 2 is located inside the main lifting jack 3, the steel strand guide frame 1 is arranged above the steel strand take-up device 2, and the steel strand 5 in the steel strand take-up device 2 extends from the bottom of the main lifting jack 3 through the steel strand guide frame 1; the steel strand 5 of the two sets of main jack lifting systems passes through the two ends of the bearing structure 4 and is connected to the two ends of the shoulder pole beam 7. The shoulder pole beam 7 is connected to the stiffening beam. The end bearing structure 4 directly bears the load of the main lifting jack 3 and is the main load-bearing component of the crane.

[0043] Furthermore, the main truss 8 is composed of multiple truss segments to form a rectangular structure, each segment truss is connected by a pin, the truss end is connected to the end bearing structure 4 by a flange, and each segment component of the main truss 8 is connected by bolts. The truss segment is composed of H-shaped steel, angle steel and channel steel.

[0044] Furthermore, the control system is composed of two hydraulic pump stations 9 and a control room 10; the two cable supports and travel systems, two hoisting systems, and two hydraulic pump stations 9 are symmetrically arranged on the main truss 8 with the control room 10 as the center; the main truss 8 only bears its own weight and the weight of the hydraulic pump station 9, the control room 10, etc., and the structural stress is small, and a lightweight design can be adopted to reduce the weight of the whole machine. The main truss 8 can also serve as a communication channel between the upstream and downstream main cables, and at the same time provide part of the lateral connection stiffness when the crane is traveling.

[0045] Furthermore, the two hydraulic pump stations 9 are respectively connected to the load transfer cylinder 12 of the cable support and walking system at one end, the traction steel strand jack 17 and the main lifting jack 3 of the lifting system; the hydraulic pump station 9 has its own generator to provide power for the above components. Preferably, a hydraulic control check valve and a balance valve are set in the hydraulic circuit between the traction steel strand jack 17 and the main lifting jack 3 and the hydraulic pump station, so that the oil circuit can be locked in case of an emergency to ensure the safety of the stiffening beam lifting.

[0046] Furthermore, a central control system is provided in the control room 10, which is connected to the hydraulic pump station 9 via a data line, and is mainly used for the whole process control of the crane cable walking and positioning, stiffening beam hoisting, etc., and monitoring the working status and operation process of all jacks, power systems, steel strand take-ups, etc. on the cross-cable crane, which belongs to the prior art and will not be described in detail here. Preferably, a central control system can control all the action mechanisms of the two cranes online, which can be conveniently used for double-machine lifting operations with larger tonnage.

[0047] Example 2

[0048] On the basis of Example 1, the present invention provides a method for using a parallel four-main-cable cross-cable crane, and the specific steps are as follows:

[0049] Step 1: Install the cable support and walking system, lifting system, and main truss 8 at the predetermined position of the formed main cable, start the load transfer cylinder of the walking mechanism, move the walking roller up to the hoop body of the walking mechanism to support the top surface of the main cable, tighten the hoop body, and the load transfer cylinder piston continues to contract to separate the walking roller from the main cable;

[0050] Step 2: The main lifting jack of the hoisting system lowers the steel strand and connects the shoulder pole beam to the stiffening beam directly below the crane (usually transported by water), starts the main lifting jack, lifts the stiffening beam into place, and connects the stiffening beam to the sling to complete the force system conversion, and then releases the connection between the shoulder pole beam and the stiffening beam;

[0051] Step 3: Start the load transfer cylinder of the traveling mechanism, the piston of the load transfer cylinder pushes out, the traveling roller moves down and is supported on the top surface of the main cable, the hoop body is opened, and the piston continues to push out, so that the traveling mechanism box drives other structures to leave the top surface of the main cable;

[0052] Step 4: Start the traction steel strand jack of the traction mechanism to move the span-cable crane forward as a whole to the predetermined position; when the walking roller moves to the cable clamp position, control the roller to move up to separate from the main cable, continue to start the traction steel strand jack to move the span-cable crane forward until the roller crosses the cable clamp, control the roller to move down and support it on the top surface of the main cable, and realize the function of the span-cable crane crossing the cable clamp by alternately raising and lowering the walking roller;

[0053] Step 5: Start the load transfer cylinder of the walking mechanism, the piston of the load transfer cylinder contracts, driving the walking mechanism box to move down and support it on the top surface of the main cable, tighten the hoop body of the walking mechanism, and the piston continues to contract to make the walking roller separate from the main cable;

[0054] Step 6: Repeat steps 2 to 5 until all stiffening beam sections are hoisted;

[0055] Step 7: Dismantle the main truss, lifting system, cable support and walking system in turn.

[0056] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design that is the same or similar to the present invention belongs to the protection scope of the present invention. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry and are not described here one by one.

Claims

1. A parallel four-main-cable cross-cable crane, comprising a cable support and walking system, a hoisting system, a main truss (8) and a control system, characterized in that: The cable support and travel system and the hoisting system are both two, and the two cable support and travel systems are respectively arranged in parallel at both ends of the main truss (8) through the hoisting system; The cable support and travel system comprises two groups of travel mechanisms, a traction mechanism, a connecting shaft box (11) and a parallel connection structure (16); the two groups of travel mechanisms are arranged in parallel and fixedly connected via the parallel connection structure (16); the upper ends of the two groups of travel mechanisms are also hinged to the connecting shaft box (11) via a transverse pin (19); the traction mechanism is arranged on the parallel connection structure (16); The walking mechanism is composed of a walking mechanism box (13), four walking wheel groups and three hoop bodies (15); the four walking wheel groups are longitudinally arranged in the walking mechanism box (13); the three hoop bodies (15) are longitudinally installed at the bottom of the walking mechanism box (13), and each hoop body is located between two adjacent four walking wheel groups; the lifting system comprises a bearing structure (4), two sets of main jack lifting systems and a shoulder pole beam (7); the bearing structure (4) is a "π"-shaped box structure, which is hinged to the connecting shaft box (11) through a longitudinal pin shaft (21); The main truss (8) is a rectangular structure formed by combining multiple truss segments. The segment trusses are connected by pins, the truss ends are connected to the end bearing structure (4) by flanges, and the segment components of the main truss (8) are connected by bolts.

2. A parallel four-main-cable cross-cable crane according to claim 1, characterized in that: The traction mechanism comprises a traction steel strand jack (17), one end of which is fixed to the parallel structure (16), and the other end of which is connected to a travel reaction frame (23) arranged on two main cables via a travel fixing anchor (22) to provide reaction force support during travel.

3. A parallel four-main-cable cross-cable crane according to claim 2, characterized in that: Each of the travel wheel assemblies is composed of a travel roller (14) and a load transfer cylinder (12); The four travel rollers (14) are all located in the travel mechanism box (13), and each travel roller (14) is connected to a load transfer cylinder (12) via a pin shaft (20). The load transfer cylinder (12) is fixedly connected above the travel mechanism box (13).

4. A parallel four-main-cable cross-cable crane according to claim 3, characterized in that: The load transfer cylinder (12) and the travel mechanism box (13) are connected by a flange.

5. The parallel four-main-cable cross-cable crane according to claim 1 is characterized in that: Two sets of main jack lifting systems are symmetrically arranged on the bearing structure (4), and the main jack lifting system comprises a main lifting jack (3) and a matching steel strand wire take-up device (2) and a steel strand wire guide frame (1); the main lifting jack (3) is fixed on the bearing structure (4), the steel strand wire take-up device (2) is located on the inner side of the main lifting jack (3), the steel strand wire guide frame (1) is arranged above the steel strand wire take-up device (2), and the steel strand wire (5) in the steel strand wire take-up device (2) extends from the bottom of the main lifting jack (3) through the steel strand wire guide frame (1); the steel strand wire (5) of the two sets of main jack lifting systems respectively passes through the two ends of the bearing structure (4) and is connected to the two ends of the shoulder pole beam (7).

6. The method for using a parallel four-main-cable cross-cable crane according to any one of claims 2 to 5, characterized in that: Specific steps for: Step 1: Install the cable support and walking system, lifting system and main truss at the predetermined position of the formed main cable, start the load transfer cylinder of the walking mechanism, move the walking roller up to the hoop body of the walking mechanism to support the top surface of the main cable, tighten the hoop body, and the piston of the load transfer cylinder continues to contract to separate the walking roller from the main cable; Step 2: The main lifting jack of the hoisting system lowers the steel strand and connects the shoulder pole beam to the stiffening beam directly below the crane. Start the main lifting jack, lift the stiffening beam into place, and connect the stiffening beam to the sling to complete the force system conversion, and then release the connection between the shoulder pole beam and the stiffening beam. Step 3: Start the load transfer cylinder of the traveling mechanism, the piston of the load transfer cylinder pushes out, the traveling roller moves down and is supported on the top surface of the main cable, the hoop body is opened, and the piston continues to push out, so that the traveling mechanism box drives other structures to leave the top surface of the main cable; Step 4: Start the traction steel strand jack of the traction mechanism to move the span-cable crane forward as a whole to the predetermined position; when the walking roller moves to the cable clamp position, control the roller to move up to separate from the main cable, continue to start the traction steel strand jack to move the span-cable crane forward until the roller crosses the cable clamp, control the roller to move down and support it on the top surface of the main cable, and realize the function of the span-cable crane crossing the cable clamp by alternately raising and lowering the walking roller; Step 5: Start the load transfer cylinder of the walking mechanism, the piston of the load transfer cylinder contracts, driving the walking mechanism box to move down and support it on the top surface of the main cable, tighten the hoop body of the walking mechanism, and the piston continues to contract to make the walking roller separate from the main cable; Step 6: Repeat steps 2 to 5 until all stiffening beam sections are hoisted; Step 7: Dismantle the main truss, lifting system, cable support and walking system in turn.

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