Dismantling method of large-span steel strand stay cable

Abstract

The invention relates to a dismantling method for a large-span steel strand stay cable, and belongs to the technical field of bridge maintenance. The dismantling method for the large-span steel strand stay cable comprises the steps that a steel strand is tensioned through a first traction mechanism, so that the steel strand at a fixed end anchorage device is subjected to force unloading, the steel strand subjected to force unloading is cut, and the large-span steel strand stay cable is obtained; the second traction mechanism is used for tensioning the hoisted steel strand so as to unload the steel strand at the tensioning end anchorage device, the unloaded steel strand is cut, the steel strand connected with the second traction mechanism is separated from the tensioning end anchorage device, the remaining steel strand is detached, and all the detached steel strands are carried; by means of the first traction mechanism and the second traction mechanism, the situation that a complex large hanging bracket needs to be installed on the tower top, consequently, installation is inconvenient and complex, and the working efficiency is reduced is avoided, the whole steel strand is broken up into parts by cutting the steel strands at the anchorage device at the fixed end one by one and cutting the steel strands at the anchorage device at the tensioning end in a grouping mode, and the construction cost is reduced. And the hoisting risk and the hoisting cost are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of bridge maintenance, and in particular to a method for dismantling a large-span steel stranded cable. Background Art

[0002] Bridges are widely built as an important transportation facility. Cable-stayed bridges, as a type of bridge that can achieve larger spans, are widely used in various transportation construction projects. The steel strand cable system is widely used in cable-stayed bridge cables, external prestressed tendons, hangers and tie rods and other structures due to its advantages such as single hanging cable and tensioning, multiple protection advantages, and miniaturized construction machinery.

[0003] During the operation of a cable-stayed bridge, the cable is subjected to long-term loads and is susceptible to adverse external environmental factors, which may lead to HDPE casing rupture, severe steel strand rust, and even cable breakage, which seriously threatens the safety of the bridge. The replacement of the steel strand cable is the reverse process of the original installation and construction, and there are technical difficulties such as insufficient length of the old steel strand, high safety risk of working in high-altitude towers, high construction difficulty, and low economic applicability. In particular, in actual operation, operators often cut the steel strand into a "stepped" shape for the sake of convenience, resulting in the length of the upper steel strand being less than the normal reserved length, or even shorter than the elastic elongation of the steel strand under tension, which makes it difficult to replace the steel strand in the future.

[0004] As mentioned above, due to the special structure of the tensioned anchor section, it is not possible to directly use the single tensioning and tensioning technology for removal. The entire cable needs to be tensioned before removal. The traditional method of removing the steel strand cable requires the erection of a large hanger on the top of the tower. The installation and removal of the hanger is extremely difficult and risky. The hoisting weight of the entire cable is also large enough, which poses an extremely unstable safety hazard. Summary of the invention

[0005] The embodiment of the present application provides a method for dismantling a large-span steel strand cable to solve the problems of low efficiency, high risk and low safety in dismantling the existing steel strands of the cable in the related art.

[0006] The present application provides a method for removing a large-span steel strand cable, comprising the following steps:

[0007] Connecting the first traction mechanism to the steel strand near the fixed end anchor, and tensioning the steel strand through the first traction mechanism to relieve the force of the steel strand at the fixed end anchor;

[0008] Cutting the unloading steel strand to separate the steel strand connected to the first traction mechanism from the fixed end anchor;

[0009] The steel strand is hoisted from above the steel strand near the tensioning end anchor by the second traction mechanism, and at the same time, the second traction mechanism tensions the hoisted steel strand to relieve the force of the steel strand at the tensioning end anchor;

[0010] Cut the unloading steel strand to separate the steel strand connected to the second traction mechanism from the tensioning end anchor;

[0011] Remove the remaining steel strands and move all removed steel strands.

[0012] In some embodiments, after the steel strand connected to the first traction mechanism is horizontally placed on the main beam, the steel strand placed on the main beam is cut as a whole at the root of the main tower to separate the steel strand connected to the fixed end anchor in a hanging state;

[0013] The steel strands near the tensioning end anchors are then grouped, hoisted, cut and lowered.

[0014] In some embodiments, after the steel strand near the tension end anchor is cut and unloaded, it continues to be suspended by tension through the second traction mechanism;

[0015] Then, the steel strands near the root of the main tower are cut among the suspended steel strands, and the steel strands falling back on the main beam are transported;

[0016] Then, the second traction mechanism is used to lower the remaining suspended steel strands, and after lowering the last group of steel strands, the next group of steel strands are hoisted, cut and lowered in sequence again.

[0017] In some embodiments, the second traction mechanism groups the steel strands evenly before connecting the steel strands near the tensioning end anchors, and suspends the suspension platform on the main tower;

[0018] The second traction mechanism is sequentially hoisted with each group of steel strands to relieve the force of the steel strands at the tensioning end anchor corresponding to each group of steel strands, and at the same time, the steel strands after the force is relieved are cut on the hanging platform;

[0019] The steel strand connected to the second traction mechanism is separated from the tensioning end anchor, and the connected steel strand is lowered to the main beam through the second traction mechanism for transportation.

[0020] In some embodiments, the first traction mechanism is disposed on a side of the main beam close to the fixed end anchor, the first traction mechanism is a winch, and the winch is connected to the steel strand at the fixed end anchor via a first clamp mechanism;

[0021] The second traction mechanism includes an electric hoist and a support frame arranged on the top of the main tower, the electric hoist is located on the main beam and close to the main tower, and the suspension platform and the support frame are connected by a lifting rope assembly;

[0022] A first pulley block is provided on one side of the electric hoist, and a second pulley block is provided on the support frame;

[0023] The steel wire rope of the electric hoist passes around the first pulley block and extends toward the second pulley block, and then passes around the second pulley block and extends to the top of the steel strand of the tensioning end anchor and is hoisted with the steel strand through the second clamp mechanism.

[0024] In some embodiments, the first clamp mechanism and the second clamp mechanism each include a first clamp block and a second clamp block connected to each other;

[0025] The first fixture block and the second fixture block are both provided with wedge-shaped holes inside and open at both ends;

[0026] The side walls of the first fixture block and the second fixture block are both provided with placement openings connected to the wedge-shaped hole.

[0027] In some embodiments, the placement opening of the first fixture block and the placement opening of the second fixture block are opened in opposite directions;

[0028] A conical clamping piece assembly for clamping the steel strand and matching with the wedge-shaped hole is arranged in the wedge-shaped hole.

[0029] In some embodiments, a threaded section is provided on one side of the first fixture block, and an internal thread connected to the threaded section is provided inside the wedge-shaped hole of the second fixture block;

[0030] A lifting ring connected to a winch is arranged on the outer side of the first fixture block.

[0031] In some embodiments, the first clamp mechanism and the second clamp mechanism both include a first clamp block for fixing and clamping the steel strand, wherein a wedge-shaped hole is provided inside the first clamp block and both ends are open;

[0032] The wedge-shaped hole is used to clamp the conical clamping piece assembly of the steel strand.

[0033] In some embodiments, a baffle for limiting the conical clamp assembly is provided on a side of the first clamp block close to the winch;

[0034] The baffle is provided with an opening, wherein the diameter of the opening is smaller than the diameter of the largest end of the conical clip assembly;

[0035] A lifting ring connected to a winch is arranged on the outer side of the first fixture block.

[0036] The beneficial effects of the technical solution provided by this application include:

[0037] The first traction mechanism and the second traction mechanism avoid the need to install a complex large hanger on the top of the tower, which makes the installation inconvenient and complicated, and reduces work efficiency. By cutting the steel strands at the fixed end anchor one by one and cutting the steel strands at the tensioning end anchor in groups, the entire steel strand is broken down into small pieces, reducing the risk and cost of lifting, so that it can be lifted with a small hanger. In addition, the safety of workers is improved by cutting in batches, avoiding excessive force intensity caused by cutting or lifting the entire strand, causing the steel strand to detach, and inconvenience for workers to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram of the structure provided for an embodiment of the present application;

[0040] Figure 2 This is a schematic diagram of a first cutting state provided at the fixed end anchor in an embodiment of the present application;

[0041] Figure 3 This is a schematic diagram of a second cutting state provided at the fixed end anchor in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of a third cutting state provided at the fixed end anchor of the embodiment of the present application;

[0043] Figure 5 A schematic diagram of a cutting state provided at the tension end anchor of an embodiment of the present application;

[0044] Figure 6 A schematic diagram of a completely dismantled state provided in an embodiment of the present application;

[0045] Figure 7 A first structural schematic diagram of a first clamp mechanism provided in an embodiment of the present application;

[0046] Figure 8 A first structural schematic diagram of a first fixture block provided in an embodiment of the present application;

[0047] Fig. 9 A schematic diagram of the structure of the second fixture block provided in an embodiment of the present application;

[0048] Fig.10 A schematic diagram of the structure of a tapered clip assembly provided in an embodiment of the present application;

[0049] Fig.11A second structural schematic diagram of the first clamp mechanism provided in an embodiment of the present application;

[0050] Fig.12 A second structural schematic diagram of the first fixture block provided in an embodiment of the present application.

[0051] 1. Main beam; 2. Main tower; 4. Fixed end anchor; 5. Second clamp mechanism; 8. Steel strand; 10. Tension end anchor; 25. Winch; 27. First clamp mechanism; 271. Baffle; 2711. Opening; 272. Lifting ring; 273. First clamp block; 2731. Threaded section; 274. Conical clip assembly; 275. Second clamp block; 2751. Internal thread; 277. Wedge-shaped hole; 278. Placement port; 28. Electric hoist; 281. First pulley block; 282. Second pulley block; 35. Support frame; 36. Suspension platform; 37. Lifting rope assembly. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] The embodiment of the present application provides a method for dismantling a large-span steel strand cable, which can solve the problems of low efficiency, high risk and low safety in dismantling the existing steel strands of the cable.

[0054] See also Figure 1-12 As shown, the embodiment of the present application provides a method for removing a large-span steel strand cable, comprising the following steps:

[0055] Step 1: Connect the first traction mechanism to the steel strand 8 close to the fixed-end anchor 4, and tension the steel strand 8 through the first traction mechanism to relieve the force of the steel strand 8 at the fixed-end anchor 4.

[0056] Before the first traction mechanism is connected to the steel strand 8, it is necessary to first pull out the outer sheath of the steel strand, so that the outer sheath of the steel strand is ring-cut near the position of the fixed end anchor 4, and a power equipment such as a traction vehicle is arranged on the main beam 1. The power equipment is connected to the ring-cut end of the outer sheath of the steel strand through a steel wire rope, and a cutting machine is arranged below the ring-cut end of the outer sheath of the steel strand. When the power equipment pulls the outer sheath of the steel strand, the outer sheath of the steel strand will be cut by the cutting device, so that the outer sheath of the steel strand can be pulled out and split along the length direction at the same time, so that the outer sheath of the steel strand can be separated from the steel strand 8.

[0057] By pre-connecting the first traction mechanism to the segment of the steel strand 8 near the fixed-end anchor 4, the steel strand 8 is tensioned toward the fixed-end anchor 4 through the first traction mechanism, so that the segment of the steel strand 8 between the fixed-end anchor 4 and the connection between the first traction mechanism and the steel strand 8 can be unloaded, avoiding the inconvenience of cutting caused by the force here. After cutting, the force will be suddenly unloaded, causing the steel strand 8 to swing due to the reaction force, which may easily cause injuries to the workers and reduce the construction safety.

[0058] Step 2: Cut the unloading steel strand 8 to separate the steel strand 8 connected to the first traction mechanism from the fixed end anchor 4.

[0059] When the first traction mechanism is connected to the steel strand 8 where the fixed-end anchor 4 is located, it is preferentially connected to one steel strand 8 each time. Each time a steel strand 8 is connected, it is tensioned and then cut to separate the steel strand 8 connected by the first traction mechanism from the fixed-end anchor 4. Then, the connected single steel strand 8 is slowly lowered by the first traction mechanism, and the gravitational inertia of the steel strand 8 is used to fall back toward the root position of the main tower 2 until all the single steel strands 8 fall back onto the main beam 1. Then, the first traction mechanism is released to connect the first traction mechanism to another steel strand 8 and repeat the above process until all the steel strands 8 at the fixed-end anchor 4 are cut and separated.

[0060] Step 3: hoist the steel strand 8 from above the steel strand 8 near the tensioning end anchor 10 through the second traction mechanism, and at the same time, the second traction mechanism tensions the hoisted steel strand 8 to relieve the force of the steel strand 8 at the tensioning end anchor 10.

[0061] Step 4: Cut the unloading steel strand 8 to separate the steel strand 8 connected to the second traction mechanism from the tensioning end anchor 10.

[0062] First, the steel strands 8 close to the tensioning end anchor 10 are grouped. Preferably, five steel strands 8 are arranged as one group, but the number is not limited to five, as long as it is within the force range of the second traction mechanism.

[0063] The second traction mechanism is connected to a group of steel strands 8, and then the group of steel strands 8 is tensioned to relieve the force of the segment of the steel strands 8 close to the tensioning end anchor 10.

[0064] Then the unloading steel strand 8 is segmented and cut to separate the steel strand 8 connected to the second traction mechanism from the tensioning end anchor 10. Then the second traction mechanism is lowered to place the steel strand 8 on the main beam 1 for transportation.

[0065] After the lowering is completed, the second traction mechanism is connected to the next group of steel strands 8, and the above operation is repeated until all the steel strands 8 at the tensioning end anchor 10 are lowered.

[0066] Step 5: remove the remaining steel strands 8 and move all the removed steel strands 8.

[0067] When the steel strands 8 connected to the first traction mechanism and the second traction mechanism are completely removed, the remaining steel strands 8 in the tensioning end anchor 10 and the fixed end anchor 4 are removed and carried away.

[0068] The first traction mechanism and the second traction mechanism avoid the need to install a complex large hanger on the top of the tower, which makes the installation inconvenient and complicated, and reduces work efficiency. By cutting the steel strands 8 at the fixed end anchor 4 one by one and cutting the steel strands 8 at the tensioning end anchor 10 in groups, the entire steel strand 8 is broken down into small pieces, reducing the risk and cost of lifting, so that it can be lifted with a small hanger, and the safety of workers is improved by cutting in batches, avoiding excessive force strength caused by cutting or lifting the entire strand, causing the steel strand 8 to detach, and inconvenience for workers to operate.

[0069] In some optional embodiments, see Figure 1-6 As shown, in the method for dismantling the large-span steel strand cable, after the first traction mechanism in step 2 places all the steel strands 8 close to the fixed end anchor 4 completely horizontally on the main beam 1, the steel strands 8 placed on the main beam 1 close to the main tower 2 are cut as a whole, and the cutting position is preferably at a height of 50 cm above the main beam 1.

[0070] After the steel strands 8 placed on the main beam 1 are cut, the cut and separated steel strands 8 are transported, and then the steel strands 8 close to the tensioning end anchor 10 are grouped, hoisted, cut and lowered, and finally all are dismantled and transported.

[0071] The steel strand 8 is divided by multiple segmented cutting, which can prevent the steel strand 8 from being too long and too heavy to be convenient to carry during transportation, and also prevent the steel strand 8 from being too long and too heavy to be dismantled, resulting in difficulty in dismantling and low dismantling efficiency. The safety of the workers is improved, and the steel strand 8 can be prevented from being entangled after being dismantled, causing difficulties in subsequent transportation and decomposition.

[0072] In some optional embodiments, see Figure 1-6 As shown, in the method for dismantling the large-span steel strand cable, after the steel strand 8 unloading force near the tensioning end anchor 10 is cut, it continues to be tension-suspended by the second traction mechanism, and then the steel strand 8 near the root of the main tower 2 among the suspended steel strands 8 is cut so that the steel strand 8 falling back on the main beam 1 is transported, and then the remaining suspended steel strands 8 are lowered by the second traction mechanism, and after the last group of steel strands 8 is lowered, they are hoisted, cut and lowered again in sequence with the next group of steel strands 8.

[0073] After the steel strand 8 near the tensioning end anchor 10 is unloaded and cut, the second traction mechanism continues to pull the steel strand 8, and then the steel strand 8 on the main beam 1 is cut as a whole at a position close to the main tower 2 and at a height of 50 cm. The steel strand 8 on the main beam 1 is cut and transported first, and then the steel strand 8 connected to the second traction mechanism is hoisted and lowered, and then transported away.

[0074] In some optional embodiments, see Figure 1-6 As shown, in the method for dismantling the large-span steel strand cable, the second traction mechanism evenly groups the steel strands 8 before connecting the steel strands 8 near the tensioning end anchor 10, and suspends the suspension platform 36 on the main tower 2;

[0075] The second traction mechanism is hoisted with each group of steel strands 8 in turn to relieve the force on the steel strands 8 at the tensioning end anchor 10 corresponding to each group of steel strands 8. At the same time, the steel strands 8 after the force relief are cut on the hanging platform 36 to separate the steel strands 8 connected by the second traction mechanism from the tensioning end anchor 10. The connected steel strands 8 are lowered by the second traction mechanism to the main beam 1 for transportation.

[0076] The steel strands 8 near the tensioning end anchor 10 are evenly grouped before being connected to the second traction mechanism. In this embodiment, five strands are preferably grouped together. Each second traction mechanism is connected to a group of steel strands 8, which are then cut and lowered. A hanging platform 36 is provided on one side of the main tower 2. The hanging platform 36 allows workers to move to a higher cutting position and then cut the steel strands 8.

[0077] In some optional embodiments, see Figure 1-12 As shown, in the method for removing the large-span steel strand cable, the first traction mechanism is arranged on one side of the main beam 1 close to the fixed end anchor 4, the first traction mechanism is a winch 25, and the winch 25 is connected to the steel strand 8 at the fixed end anchor 4 through a first clamp mechanism 27;

[0078] The second traction mechanism includes an electric hoist 28 and a support frame 35 disposed on the top of the main tower 2. The electric hoist 28 is located on the main beam 1 and close to the main tower 2. The suspension platform 36 and the support frame 35 are connected by a lifting rope assembly 37.

[0079] A first pulley group 281 is provided on one side of the electric hoist 28, and a second pulley group 282 is provided on the support frame 35. The wire rope of the electric hoist 28 passes around the first pulley group 281 and extends toward the second pulley group 282, then passes around the second pulley group 282 and extends to the top of the steel strand 8 of the tensioning end anchor 10, and is hoisted with the steel strand 8 through the second clamp mechanism 5.

[0080] A winch 25 is set at a position of the main beam 1 near the fixed end anchor 4 to connect the steel strand 8 near the fixed end anchor 4, an electric hoist 28 and a first pulley group 281 are set at a position of the main beam 1 near the main tower 2, a support frame 35 is fixed on the top of the main tower 2 and a second pulley group 282 is fixed on the support frame 35, the steel wire rope of the electric hoist 28 passes through the first pulley group 281 and changes direction to extend toward the second pulley group 282, then passes through the second pulley group 282 and changes direction again, extending toward the steel strand 8 until it is connected to the steel strand 8.

[0081] A lifting rope assembly 37 for suspending a suspension platform 36 is provided on the support frame 35 , wherein the winch 25 is connected to the steel strand 8 via a first clamp mechanism 27 , and the electric hoist 28 is connected to the steel strand 8 via a second clamp mechanism 5 .

[0082] In some optional embodiments, see Figure 1 and Figure 7-10 As shown, in the method for dismantling the large-span steel strand cable, the first clamp mechanism 27 and the second clamp mechanism 5 both include a first clamp block 273 and a second clamp block 275 which are connected to each other, the first clamp block 273 and the second clamp block 275 both have wedge-shaped holes 277 opened inside and are open at both ends, and the side walls of the first clamp block 273 and the second clamp block 275 both have placement openings 278 connected to the wedge-shaped holes 277.

[0083] In this embodiment, the placement opening 278 of the first clamp block 273 and the placement opening 278 of the second clamp block 275 have opening directions opposite to each other, and a conical clip assembly 274 for clamping the steel strand 8 and cooperating with the wedge-shaped hole 277 is disposed in the wedge-shaped hole 277 .

[0084] In this embodiment, a threaded section 2731 is provided on one side of the first clamp block 273, an internal thread 2751 connected to the threaded section 2731 is provided inside the wedge-shaped hole 277 of the second clamp block 275, and a lifting ring 272 connected to the winch 25 is provided on the outer side of the first clamp block 273.

[0085] The steel strand 8 is placed into the wedge-shaped hole 277 of the first clamp block 273 through the placement opening 278, and the first clamp block 273 is sleeved on the outside of the steel strand 8. Then, the conical clamp assembly 274 is inserted into the wedge-shaped hole 277 from the opening on one side of the first clamp block 273 close to the threaded section 2731, and sleeved on the outside of the steel strand 8. The conical clamp assembly 274 is used to clamp the steel strand 8 in the wedge-shaped hole 277. Then, the placement opening 278 of the second clamp block 275 is used to sleeve the second clamp block 275 on the outside of the steel strand 8, and the steel strand 8 is located in the wedge-shaped hole 277 of the second clamp block 275. Then, the second clamp block 275 uses its internal internal thread 2751 to cooperate with the threaded section 2731 of the first clamp block 273, so that the second clamp block 275 is screwed on the threaded section 2731 of the first clamp block 273, so that the first clamp block 273 and the second clamp block 275 are connected together, and the placement opening 278 of the second clamp block 275 is in the opposite direction to the placement opening 278 of the first clamp block 273 after the second clamp block 275 is installed, so that the steel wire rope 8 is clamped alternately with the first clamp block 273 and the second clamp block 275, further improving the clamping force of the first clamp mechanism 27 and the second clamp mechanism 5.

[0086] After the first traction mechanism and the second traction mechanism are connected and cut, the steel strand 8 will rotate after cutting because the steel strand 8 is spirally wound together, causing the conical clamp assembly 274 to rotate. The second clamp block 275 plays a secondary positioning, limiting and clamping role on the steel strand 8, and also prevents the self-rotating steel strand 8 from causing the conical clamp assembly 274 to rotate and generate centrifugal force to fly out of the first clamp block 273. The conical clamp assembly 274 in the first clamp block 273 is limited by the second clamp block 275 to prevent it from detaching, thereby improving safety.

[0087] The conical clip assembly 274 is composed of two arc-shaped clips, and the shape of the conical clip assembly 274 is adapted to the wedge-shaped hole 277. The directions of the conical clip assemblies 274 inside the first clamp block 273 and the second clamp block 275 are the same, so that the second clamp block 275 can limit the conical clip assembly 274 in the first clamp block 273.

[0088] The diameter of the wedge-shaped hole 277 on the side close to the threaded section 2731 is larger than the diameter on the side away from the threaded section 2731 , and the lifting ring 272 is U-shaped. The lifting ring 272 is arranged on the outside of the first clamp block 273 and faces the second clamp block 275 . It can also be understood that the second clamp block 275 is inside the U-shaped lifting ring 272 .

[0089] In some optional embodiments, see Figure 1 and Figure 9-12As shown, in the method for dismantling the large-span steel strand cable, the first clamp mechanism 27 and the second clamp mechanism 5 both include a first clamp block 273 for fixing and clamping the steel strand 8, the first clamp block 273 has a wedge-shaped hole 277 inside and open at both ends, and a conical clamp assembly 274 for clamping the steel strand 8 is inside the wedge-shaped hole 277.

[0090] In this embodiment, a baffle 271 for limiting the conical clamp assembly 274 is provided on the side of the first clamp block 273 close to the winch 25, and an opening 2711 is provided on the baffle 271. The diameter of the opening 2711 is smaller than the diameter of the conical clamp assembly 274 at the maximum end. A lifting ring 272 connected to the winch 25 is provided on the outer side of the first clamp block 273.

[0091] The diameter of the wedge-shaped hole 277 on the side close to the baffle 271 is larger than the diameter on the side away from the baffle 271, and the lifting ring 272 is U-shaped. The lifting ring 272 is arranged on the outside of the first clamp block 273 and faces the baffle 271. It can also be understood that the baffle 271 is inside the U-shaped lifting ring 272, and the conical clip assembly 274 is composed of two arc-shaped clips, and the shape of the conical clip assembly 274 is adapted to match the wedge-shaped hole 277.

[0092] The steel strand 8 is placed into the wedge-shaped hole 277 of the first clamp block 273 through the placement opening 278, and the first clamp block 273 is sleeved on the outside of the steel strand 8. Then, the conical clamp assembly 274 is inserted into the wedge-shaped hole 277 from the side opening of the first clamp block 273 close to the threaded section 2731, and sleeved on the outside of the steel strand 8. The conical clamp assembly 274 is used to clamp the steel strand 8 in the wedge-shaped hole 277. After the first traction mechanism and the second traction mechanism are connected to the steel strand 8 for cutting, because the steel strand 8 is spirally wound together, the steel strand 8 will rotate after cutting. Therefore, it is necessary to fix the baffle 271 at the end with the largest diameter of the wedge-shaped hole 277 in the first clamp block 273. The diameter of the opening 2711 of the baffle 271 is larger than the diameter of the steel strand 8 and smaller than the maximum diameter of the conical clamp assembly 274, so as to prevent the conical clamp assembly 274 from flying out.

[0093] The baffle plate 271 and the first clamp block 273 are fixed in a detachable manner, a first bolt hole is opened on the outer wall of the first clamp block 273, and a second bolt hole corresponding to the first bolt hole is opened on the baffle plate 271. When the conical clamp assembly 274 needs to be installed, the baffle plate 271 is removed. After the conical clamp assembly 274 is installed, the baffle plate 271 and the first clamp block 273 are connected and fixed by bolts passing through the first bolt hole and the second bolt hole.

[0094] Working principle and process of this application:

[0095] The first traction mechanism is connected to the steel strand 8 near the fixed-end anchor 4, and the steel strand 8 is tensioned by the first traction mechanism to relieve the force of the steel strand 8 at the fixed-end anchor 4.

[0096] The unloading steel strand 8 is cut to separate the steel strand 8 connected to the first traction mechanism from the fixed end anchor 4.

[0097] The steel strand 8 is hoisted from above the steel strand 8 near the tensioning end anchor 10 by the second traction mechanism, and at the same time, the second traction mechanism tensions the hoisted steel strand 8 to relieve the force of the steel strand 8 at the tensioning end anchor 10.

[0098] The unloading steel strand 8 is cut to separate the steel strand 8 connected to the second traction mechanism from the tensioning end anchor 10 .

[0099] The remaining steel strands 8 are removed, and all the removed steel strands 8 are transported.

[0100] When the steel strands 8 connected to the first traction mechanism and the second traction mechanism are completely removed, the remaining steel strands 8 in the tensioning end anchor 10 and the fixed end anchor 4 are removed and carried away.

[0101] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0102] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0103] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for dismantling a large-span steel strand cable. It is characterized in that include: The first traction mechanism is connected to the steel strand (8) near the fixed end anchor (4), and the steel strand (8) is tensioned by the first traction mechanism so as to relieve the force of the steel strand (8) at the fixed end anchor (4); Cutting the unloading steel strand (8) to separate the steel strand (8) connected to the first traction mechanism from the fixed end anchor (4); The steel strand (8) is hoisted from above the steel strand (8) near the tensioning end anchor (10) by means of a second traction mechanism, and at the same time the second traction mechanism tensions the hoisted steel strand (8) so as to relieve the force of the steel strand (8) at the tensioning end anchor (10); Cutting the unloading steel strand (8) to separate the steel strand (8) connected to the second traction mechanism from the tensioning end anchor (10); The remaining steel strands (8) are removed, and all the removed steel strands (8) are transported.

2. The method for removing a large-span steel strand cable according to claim 1, Features: After the steel strand (8) connected to the first traction mechanism is horizontally placed on the main beam (1), the steel strand (8) placed on the main beam (1) is cut as a whole at the root of the main tower (2) to separate the steel strand (8) in a hanging state connected to the fixed end anchor (4); Then the steel strands (8) near the tensioning end anchor (10) are grouped, hoisted, cut and lowered.

3. The method for dismantling a large-span steel strand cable according to claim 1, Features: After the steel strand (8) near the tension end anchor (10) is cut, it continues to be suspended by tension through the second traction mechanism; Then, the steel strands (8) near the root of the main tower (2) among the suspended steel strands (8) are cut so that the steel strands (8) that fall back on the main beam (1) can be transported; Then, the remaining suspended steel strands (8) are lowered by using the second traction mechanism, and after the last group of steel strands (8) are lowered, they are hoisted, cut and lowered again in sequence with the next group of steel strands (8).

4. The method for dismantling a large-span steel strand cable according to claim 1, Features: The second traction mechanism evenly groups the steel strands (8) before connecting the steel strands (8) near the tensioning end anchor (10), and suspends a suspension platform (36) on the main tower (2); The second traction mechanism is sequentially hoisted with each group of steel strands (8) to relieve the force of the steel strands (8) at the tensioning end anchor (10) corresponding to each group of steel strands (8), and the steel strands (8) after the force relief are cut on the suspension platform (36); The steel strand (8) connected to the second traction mechanism is separated from the tensioning end anchor (10), and the connected steel strand (8) is lowered to the main beam (1) through the second traction mechanism for transportation.

5. The method for removing a large-span steel strand cable according to claim 1, Features: The first traction mechanism is arranged on a side of the main beam (1) close to the fixed end anchor (4), the first traction mechanism is a winch (25), and the winch (25) is connected to the steel strand (8) at the fixed end anchor (4) via a first clamp mechanism (27); The second traction mechanism comprises an electric hoist (28) and a support frame (35) arranged on the top of the main tower (2), the electric hoist (28) is located on the main beam (1) and close to the main tower (2), and the suspension platform (36) and the support frame (35) are connected by a lifting rope assembly (37); A first pulley block (281) is disposed on one side of the electric hoist (28), and a second pulley block (282) is disposed on the support frame (35); The steel wire rope of the electric hoist (28) passes around the first pulley block (281) and extends toward the second pulley block (282), then passes around the second pulley block (282) and extends to the top of the steel strand (8) of the tensioning end anchor (10), and is hoisted with the steel strand (8) through the second clamp mechanism (5).

6. The method for removing a large-span steel strand cable according to claim 5, Features: The first clamp mechanism (27) and the second clamp mechanism (5) both comprise a first clamp block (273) and a second clamp block (275) connected to each other; The first clamp block (273) and the second clamp block (275) are both provided with wedge-shaped holes (277) inside and both ends are open; The side walls of the first clamp block (273) and the second clamp block (275) are both provided with placement openings (278) communicating with the wedge-shaped hole (277).

7. The method for removing a large-span steel strand cable according to claim 6, Features: The placement opening (278) of the first fixture block (273) and the placement opening (278) of the second fixture block (275) have opening directions opposite to each other; A conical clamping piece assembly (274) for clamping the steel strand (8) and matching with the wedge-shaped hole (277) is arranged in the wedge-shaped hole (277).

8. The method for removing a large-span steel strand cable according to claim 7, Features: A threaded section (2731) is provided on one side of the first clamp block (273), and an internal thread (2751) connected to the threaded section (2731) is provided inside the wedge-shaped hole (277) of the second clamp block (275); A lifting ring (272) connected to a winch (25) is provided on the outer side of the first clamp block (273).

9. The method for dismantling a large-span steel strand cable according to claim 5, Features: The first clamp mechanism (27) and the second clamp mechanism (5) both comprise a first clamp block (273) for fixing and clamping the steel strand (8); a wedge-shaped hole (277) is provided inside the first clamp block (273) and both ends are open; The wedge-shaped hole (277) is used to clamp the conical clamping piece assembly (274) of the steel strand (8).

10. The method for dismantling a large-span steel strand cable according to claim 9, Features: A baffle (271) for limiting the conical clamp assembly (274) is provided on one side of the first clamp block (273) close to the winch (25); The baffle (271) is provided with an opening (2711), and the diameter of the opening (2711) is smaller than the diameter of the largest end of the conical clip assembly (274); A lifting ring (272) connected to a winch (25) is provided on the outer side of the first clamp block (273).

Images