CN119121814A - A method for dismantling a large-span steel strand cable - Google Patents
A method for dismantling a large-span steel strand cable Download PDFInfo
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- CN119121814A CN119121814A CN202411532426.1A CN202411532426A CN119121814A CN 119121814 A CN119121814 A CN 119121814A CN 202411532426 A CN202411532426 A CN 202411532426A CN 119121814 A CN119121814 A CN 119121814A
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- steel
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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Abstract
The application relates to a dismantling method of a long-span steel strand stay cable, which belongs to the technical field of bridge maintenance and comprises the steps of tensioning steel strands through a first traction mechanism so as to enable the steel strands at a fixed end anchor to unload force, cutting the unloaded steel strands, tensioning the hoisted steel strands through a second traction mechanism so as to enable the steel strands at the tension end anchor to unload force, cutting the unloaded steel strands, separating the steel strands connected with the second traction mechanism from the tension end anchor, dismantling the remaining steel strands and carrying all the dismantled steel strands.
Description
Technical Field
The application relates to the technical field of bridge maintenance, in particular to a method for dismantling a long-span steel strand stay cable.
Background
The bridge is widely constructed as an important traffic facility, wherein the cable-stayed bridge is widely applied to various traffic construction projects as a bridge type capable of realizing large span spanning, and the steel strand inhaul cable system is widely applied to structures such as cable-stayed bridge inhaul cables, external prestressed bundles, suspenders, tie bars and the like due to the advantages of single cable hanging, tensioning, multiple protection advantages, miniaturization of construction machines and the like.
During operation of the cable-stayed bridge, the stay cable bears load for a long time and is easy to cause diseases such as HDPE sleeve rupture, serious steel strand corrosion, cable breakage and the like under the action of external environment adverse factors, the safety of the bridge is seriously threatened, the replacement construction of the steel strand stay cable is the reverse process of the original installation construction, and the technical problems of insufficient stay length of the old steel strand, high operation safety risk in a high-altitude tower, high construction difficulty, low economic applicability and the like exist. Particularly in actual operation, operators often cut the reserved length of the steel strand into a step shape due to covet operation convenience, so that the reserved length of the upper layer steel strand is smaller than the normal reserved length and even shorter than the elastic elongation under the tensile force of the steel strand, and the steel strand is difficult to replace in the future.
As mentioned above, due to the special structure of the tensioning and anchoring section, the single tensioning and releasing technology cannot be directly adopted for dismounting, and the whole cable is required to be released Zhang Hou for dismounting. The traditional steel strand stay cable dismantling method needs to set up a large-scale hanging bracket on the tower top, the hanging bracket is extremely difficult to install and dismantle and has extremely high risk, the whole hoisting weight of the stay cable is also large enough, and the potential safety hazard of extremely instability exists.
Disclosure of Invention
The embodiment of the application provides a method for dismantling a long-span steel strand stay cable, which aims to solve the problems of low dismantling efficiency, high dismantling risk and low safety of the existing stay cable steel strand in the related technology.
The embodiment of the application provides a dismantling method of a long-span steel strand stay cable, which comprises the following steps:
Connecting the first traction mechanism with the steel strand close to the fixed end anchor, and tensioning the steel strand through the first traction mechanism so as to unload the steel strand at the fixed end anchor;
cutting the steel strand with the unloading force to separate the steel strand connected with the first traction mechanism from the fixed end anchor;
Hoisting the steel strand from above the steel strand near the tension end anchor through a second traction mechanism, and tensioning the hoisted steel strand by the second traction mechanism to unload the steel strand at the tension end anchor;
Cutting the steel strand with the unloading force to separate the steel strand connected with the second traction mechanism from the tension end anchor;
And removing the residual steel strands, and carrying all the removed steel strands.
In some embodiments, after the steel strand connected with the first traction mechanism is horizontally placed on the main beam, integrally cutting the steel strand placed on the main beam at the root position of the main tower, and separating the steel strand from the steel strand connected with the fixed end anchor in a falling state;
And grouping, hoisting, cutting and lowering the steel strands close to the anchor at the tensioning end.
In some embodiments, after the steel strand near the tension end is cut, continuing to suspend by tension of the second traction mechanism;
Cutting the steel stranded wires close to the root position of the main tower in the suspended steel stranded wires to enable the steel stranded wires falling back on the main beam to be carried;
And then the second traction mechanism is used for lowering the remaining suspended steel strands, and after the next group of steel strands are lowered, the steel strands and the next group of steel strands are sequentially lifted, cut and lowered.
In some embodiments, wherein the second traction mechanism groups the steel strands evenly and suspends the suspension platform on the main tower before connecting the steel strands near the tension end anchor;
The second traction mechanism is sequentially hoisted with each group of steel strands, so that the steel strands at the anchor of the tensioning end corresponding to each group of steel strands are subjected to force unloading, and meanwhile, the steel strands subjected to force unloading are cut on a suspension platform;
And separating the steel strand connected with the second traction mechanism from the tension end anchor, and lowering the connected steel strand to the main beam for carrying through the second traction mechanism.
In some embodiments, the first traction mechanism is arranged on one side of the main beam close to the fixed end anchor, the first traction mechanism is a winch, and the winch is connected with the steel strand at the fixed end anchor through a first clamp mechanism;
the second traction mechanism comprises an electric hoist and a support frame arranged at the top of the main tower, the electric hoist is positioned on the main beam and is close to the main tower, and the suspension platform is in transmission connection with the support frame through a lifting rope assembly;
a first pulley block is arranged on one side of the electric hoist, and a second pulley block is arranged on the support frame;
The steel wire rope of the electric hoist extends towards the second pulley block around the first pulley block, and then extends to the upper side of the steel strand of the tension end anchor device around the second pulley block, and is hoisted with the steel strand through the second clamp mechanism.
In some embodiments, the first and second clamp mechanisms each comprise first and second clamp blocks connected to each other;
Wedge-shaped holes are formed in the first clamp block and the second clamp block, and two ends of the wedge-shaped holes are open;
And the side walls of the first clamp block and the second clamp block are provided with placing openings communicated with the wedge-shaped holes.
In some embodiments, the placement opening of the first clamp block is opposite to the placement opening of the second clamp block;
and a conical clamping piece assembly which is used for clamping the steel strand and is matched with the wedge-shaped hole is arranged in the wedge-shaped hole.
In some embodiments, a threaded section is arranged on one side of the first clamp block, and an internal thread connected with the threaded section is arranged inside the wedge-shaped hole of the second clamp block;
And a hanging ring connected with the winch is arranged on the outer side of the first clamp block.
In some embodiments, the first clamp mechanism and the second clamp mechanism each comprise a first clamp block for fixedly clamping the steel strand, wherein a wedge-shaped hole is formed in the first clamp block, and two ends of the first clamp block are open;
and the tapered clamping piece assembly is used for clamping the steel strand in the wedge-shaped hole.
In some embodiments, a baffle for limiting the conical clamping piece assembly is arranged on one side of the first clamp block, which is close to the winch;
The baffle is provided with an opening, and the diameter of the opening is smaller than the diameter of the largest diameter end of the conical clamping piece assembly;
And a hanging ring connected with the winch is arranged on the outer side of the first clamp block.
The technical scheme provided by the application has the beneficial effects that:
The first traction mechanism and the second traction mechanism avoid the need of installing a complicated large-sized hanging bracket on the top of the tower, so that the installation is inconvenient, the installation is complicated, the working efficiency is reduced, the steel strands at the anchor of the fixed end are cut one by one, the steel strands at the anchor of the tensioning end are cut in groups, the whole steel strands are made to be zero, the hanging risk is reduced, the hanging cost is reduced, the small-sized hanging bracket can be used for hanging, the safety of workers is improved through batch cutting, the situation that the stress intensity is overlarge due to the whole cutting or hanging is avoided, the steel strands are separated, and the workers are inconvenient to operate is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a structure provided in an embodiment of the present application;
FIG. 2 is a schematic view of a first cutting state provided at a fixed end anchor according to an embodiment of the present application;
FIG. 3 is a schematic view of a second cutting condition provided at a fixed end anchor in an embodiment of the present application;
FIG. 4 is a schematic view of a third cutting condition provided at a fixed end anchor according to an embodiment of the present application;
FIG. 5 is a schematic view of a cut provided at a tensioned end anchor according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a completely removed state according to an embodiment of the present application;
FIG. 7 is a first schematic view of a first clamping mechanism according to an embodiment of the present application;
FIG. 8 is a first schematic view of a first clamp block according to an embodiment of the present application;
FIG. 9 is a schematic diagram of a second clamp block according to an embodiment of the present application;
FIG. 10 is a schematic view of the structure provided by the tapered clip assembly of the present application;
FIG. 11 is a second schematic view of the first clamping mechanism according to the embodiment of the present application;
Fig. 12 is a second schematic view of the first clamp block according to the embodiment of the present application.
1. The main beam, 2, the main tower, 4, the fixed end anchor, 5, the second clamp mechanism, 8, the steel strand, 10, the tension end anchor, 25, the winch, 27, the first clamp mechanism, 271, the baffle, 2711, the opening, 272, the hanging ring, 273, the first clamp block, 2731, the threaded section, 274, the conical clamping piece assembly, 275, the second clamp block, 2751, the internal thread, 277, the wedge-shaped hole, 278, the placing opening, 28, the electric hoist, 281, the first pulley block, 282, the second pulley block, 35, the support frame, 36, the hanging platform, 37 and the lifting rope assembly.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a method for dismantling a long-span steel strand stay cable, which can solve the problems of low dismantling efficiency, large dismantling risk and low safety of the existing stay cable steel strand.
Referring to fig. 1-12, an embodiment of the application provides a method for dismantling a long-span steel strand stay cable, which comprises the following steps:
step 1, connecting a first traction mechanism with a steel strand 8 close to the fixed end anchor 4, and tensioning the steel strand 8 through the first traction mechanism so as to unload the steel strand 8 at the fixed end anchor 4.
The steel strand outer sheath is required to be pulled away before the first traction mechanism is connected with the steel strand 8, so that the steel strand outer sheath is annularly cut at the position close to the fixed end anchorage device 4, power equipment such as a tractor is arranged on the main beam 1, the power equipment is connected with the annular cutting end of the steel strand outer sheath through a steel wire rope, a cutting machine is arranged below the annular cutting end of the steel strand outer sheath, when the power equipment pulls the steel strand outer sheath, the steel strand outer sheath can be cut by a cutting device, and the steel strand outer sheath can be pulled away and cut along the length direction, so that the steel strand outer sheath can be separated from the steel strand 8.
The steel strand 8 is connected to the section of the steel strand 8 near the fixed end anchor 4 in advance through the first traction mechanism, the steel strand 8 stretches towards the direction of the fixed end anchor 4 through the first traction mechanism, so that the force is discharged from the section of the steel strand 8 between the fixed end anchor 4 and the connection of the first traction mechanism and the steel strand 8, inconvenience in cutting caused by the force is avoided, the steel strand 8 is thrown through the reaction force due to sudden force discharge after cutting, injury is easily caused to workers, and construction safety is reduced.
And 2, cutting the steel strand 8 subjected to force unloading, so that the steel strand 8 connected with the first traction mechanism is separated from the fixed end anchor 4.
When the first traction mechanism is connected with the steel strand 8 where the fixed end anchor 4 is, one steel strand 8 is preferentially connected each time, each steel strand 8 is connected to stretch and cut, the steel strand 8 connected with the first traction mechanism is separated from the fixed end anchor 4, then the connected single steel strand 8 is slowly dropped back towards the root position of the main tower 2 by utilizing the gravity inertia of the steel strand 8 under the first traction mechanism until the single steel strand 8 is completely dropped onto the main beam 1, and then the first traction mechanism is loosened to be connected with one steel strand 8 again to repeat the process until the steel strand 8 at the fixed end anchor 4 is completely cut and separated.
And 3, hoisting the steel strand 8 from above the steel strand 8 close to the tension end anchor 10 through a second traction mechanism, and tensioning the hoisted steel strand 8 through the second traction mechanism to unload the steel strand 8 at the tension end anchor 10.
And 4, cutting the steel strand 8 with the unloading force, and separating the steel strand 8 connected with the second traction mechanism from the tension end anchor 10.
The steel strands 8 near the tensioning end anchor 10 are first grouped, preferably five steel strands 8 being provided in a group, but not limited to five, as long as they are within the stress range of the second traction mechanism.
The second traction mechanism is connected to a set of steel strands 8 and then the set of steel strands 8 is tensioned to unload the segments of steel strands 8 near the tensioned end anchor 10.
Then cutting the section of the steel strand 8 with the unloading force, separating the steel strand 8 connected with the second traction mechanism from the tension end anchor 10, then enabling the second traction mechanism to lower the steel strand 8, and enabling the steel strand 8 connected with the second traction mechanism to be placed on the main beam 1 for carrying.
After the lowering is completed, the second traction mechanism is connected with the steel strand 8 of the next group, and the operation is repeated until all the steel strands 8 at the anchor 10 of the tensioning end are lowered.
And 5, removing the residual steel stranded wires 8, and carrying all the removed steel stranded wires 8.
After the steel strands 8 connected with the first traction mechanism and the second traction mechanism are removed, the residual steel strands 8 in the tensioning end anchor 10 and the fixed end anchor 4 are removed, taken out and carried.
The first traction mechanism and the second traction mechanism avoid the need of installing a complicated large-sized hanging bracket on the top of the tower, so that the installation is inconvenient, the installation is complicated, the working efficiency is reduced, the steel strands 8 at the fixed end anchorage 4 are cut one by one, the steel strands 8 at the tensioning end anchorage 10 are cut in groups, the whole steel strands 8 are integrated into zero, the hanging risk is reduced, the hanging cost is reduced, the small-sized hanging bracket can be used for hanging, the safety of workers is improved through batch cutting, the overlarge stress intensity caused by whole cutting or hanging is avoided, the steel strands 8 are separated, and the operation is inconvenient for the workers.
In some alternative embodiments, referring to fig. 1-6, in the method for removing the long span steel strand stay cable, after the first traction mechanism in step 2 completely horizontally places all the steel strands 8 near the fixed end anchor 4 on the main beam 1, the steel strands 8 placed on the main beam 1 are integrally cut near the main tower 2, and the cutting position is preferably a height 50cm above the main beam 1.
After cutting the steel strands 8 placed on the main beam 1, carrying the cut and separated steel strands 8, grouping, hoisting, cutting and lowering the steel strands 8 close to the tension end anchor 10, and finally removing and carrying all the steel strands.
The steel strand wires 8 are cut apart through segmentation cutting many times, and the steel strand wires 8 overlength is overweight when avoiding the transport is inconvenient to carry, also avoids steel strand wires 8 overlength when demolising to lead to demolishing the difficulty, demolishs inefficiency, has improved staff's security, and avoids steel strand wires 8 to demolish the back and can entanglement together, causes the difficulty for follow-up transport and decomposition.
In some alternative embodiments, referring to fig. 1-6, in the method for removing the long span steel strand stay cable, after the steel strands 8 near the tension end anchor 10 are cut, the steel strands 8 continue to be suspended by tension of the second traction mechanism, then the steel strands 8 near the root position of the main tower 2 in the suspended steel strands 8 are cut to enable the steel strands 8 falling back on the main beam 1 to be carried, then the remaining suspended steel strands 8 are lowered by using the second traction mechanism, and after the next group of steel strands 8 are lowered, the steel strands 8 are sequentially lifted, cut and lowered again with the next group of steel strands 8.
When the steel strand 8 close to the tension end anchor 10 is subjected to force unloading cutting, the second traction mechanism is continuously used for traction of the steel strand 8, then the steel strand 8 on the main beam 1is integrally cut at a position close to the main tower 2 and with the height of 50cm, the steel strand 8 on the main beam 1is firstly cut and carried, then the steel strand 8 connected with the second traction mechanism is lifted and lowered, and then the steel strand 8 is carried away.
In some alternative embodiments, referring to fig. 1-6, the method of removing a long span strand stay cable, wherein a second traction mechanism uniformly groups the strands 8 and suspends a suspension platform 36 on the main tower 2 prior to connecting the strands 8 adjacent to the tension end anchor 10;
The second traction mechanism is sequentially hoisted with each group of steel strands 8, so that the steel strands 8 at the tension end anchor 10 corresponding to each group of steel strands 8 are subjected to force unloading, meanwhile, the steel strands 8 subjected to force unloading are cut on the suspension platform 36, the steel strands 8 connected with the second traction mechanism are separated from the tension end anchor 10, and the connected steel strands 8 are lowered to the main beam 1 through the second traction mechanism for carrying.
The steel strands 8 near the tension end anchor 10 are evenly grouped, preferably in groups of five in this embodiment, before being connected to the second traction means, each of which is connected to a group of steel strands 8 and then cut down, and a suspension platform 36 is provided on one side of the main tower 2, by means of which suspension platform 36 the staff can be moved to a raised cutting position and then cut the steel strands 8.
In some alternative embodiments, referring to fig. 1-12, in the method for removing the long span steel strand stay cable, a first traction mechanism is arranged on one side of the main beam 1 near the fixed end anchor 4, the first traction mechanism is a winch 25, and the winch 25 is connected with the steel strand 8 at the fixed end anchor 4 through a first clamp mechanism 27;
The second traction mechanism comprises an electric hoist 28 and a support frame 35 arranged at the top of the main tower 2, the electric hoist 28 is positioned on the main beam 1 and is close to the main tower 2, and the suspension platform 36 is in transmission connection with the support frame 35 through a lifting rope assembly 37;
The first pulley block 281 is arranged on one side of the electric hoist 28, the second pulley block 282 is arranged on the supporting frame 35, a steel wire rope of the electric hoist 28 bypasses the first pulley block 281 and extends towards the second pulley block 282, and then bypasses the second pulley block 282 to extend to the upper side of the steel stranded wire 8 of the tensioning end anchor 10 to be hoisted with the steel stranded wire 8 through the second clamp mechanism 5.
The steel wire rope of the electric hoist 28 passes through the first pulley block 281 and changes direction to extend towards the second pulley block 282, then passes through the second pulley block 282 again to change direction to extend towards the steel strand 8 until being connected with the steel strand 8.
Wherein a lifting rope assembly 37 for suspending a suspension platform 36 is provided on the support frame 35, wherein the hoist 25 is connected with the steel strand 8 through the first clamp mechanism 27, and the electric hoist 28 is connected with the steel strand 8 through the second clamp mechanism 5.
In some alternative embodiments, referring to fig. 1 and fig. 7-10, in the method for removing the long span steel strand stay cable, the first clamp mechanism 27 and the second clamp mechanism 5 each include a first clamp block 273 and a second clamp block 275 which are connected to each other, the inside of the first clamp block 273 and the inside of the second clamp block 275 are both provided with wedge holes 277, both ends of the first clamp block 273 and the second clamp block 275 are opened, and the side walls of the first clamp block 273 and the second clamp block 275 are provided with placing openings 278 which are communicated with the wedge holes 277.
In this embodiment, the placement opening 278 of the first clamp block 273 is opposite to the placement opening 278 of the second clamp block 275, and a tapered clamping piece assembly 274 for clamping the steel strand 8 and matching the tapered hole 277 is disposed in the tapered hole 277.
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 hoisting ring 272 connected to the hoist 25 is provided on the outer side of the first clamp block 273.
Placing the steel stranded wire 8 into the wedge-shaped hole 277 of the first clamp block 273 through the placing opening 278, sleeving the first clamp block 273 on the outer side of the steel stranded wire 8, then enabling the conical clamping piece assembly 274 to be inserted into the wedge-shaped hole 277 from one side opening of the first clamp block 273, which is close to the threaded section 2731, sleeving the steel stranded wire 8 on the outer side of the steel stranded wire 8, clamping the steel stranded wire 8 in the wedge-shaped hole 277 by utilizing the conical clamping piece assembly 274, sleeving the second clamp block 275 on the outer side of the steel stranded wire 8 by utilizing the placing opening 278 of the second clamp block 275, positioning the steel stranded wire 8 in the wedge-shaped hole 277 of the second clamp block 275, enabling the second clamp block 275 to be matched with the threaded section 2731 of the first clamp block 273 by utilizing the internal threads 2751 of the second clamp block 275, enabling the second clamp block 275 to be screwed on the threaded section 2731 of the first clamp block 273, enabling the first clamp block 273 to be connected with the second clamp block 275, enabling the placing opening 278 of the second clamp block 275 to be opposite to the placing opening 278 of the first clamp block 275 after the second clamp block 275 is installed, and further improving the clamping force of the second clamp block 8 and the second clamp mechanism 27.
After the first traction mechanism and the second traction mechanism are connected with the steel strand wires 8 for cutting, because the steel strand wires 8 are spirally wound together, the steel strand wires 8 can automatically rotate after being cut, the conical clamping piece assembly 274 is driven to rotate, the secondary positioning, limiting and clamping effects on the steel strand wires 8 are achieved through the second clamping piece 275, the steel strand wires 8 which automatically rotate are prevented from rotating to generate centrifugal force to fly out of the first clamping piece 273, the conical clamping piece assembly 274 in the first clamping piece 273 is limited through the second clamping piece 275, separation is avoided, and safety is improved.
Wherein the conical clamping piece assembly 274 is composed of two arc clamping pieces, the shape of the conical clamping piece assembly 274 is matched with the wedge-shaped hole 277, the direction of the conical clamping piece assembly 274 inside the first clamping piece 273 is the same as that of the second clamping piece assembly 275, and the second clamping piece 275 can limit the conical clamping piece assembly 274 in the first clamping piece 273.
Wherein the diameter of the wedge-shaped hole 277 near the threaded section 2731 is larger than the diameter of the ring 272 far from the threaded section 2731, wherein the ring 272 is U-shaped, and the ring 272 is disposed outside the first clamp block 273 and faces the second clamp block 275, which can also be understood as the second clamp block 275 being inside the U-shaped ring 272.
In some alternative embodiments, referring to fig. 1 and 9-12, in the method for removing the long span steel strand stay cable, the first clamping mechanism 27 and the second clamping mechanism 5 each comprise a first clamping block 273 for fixedly clamping the steel strand 8, a wedge-shaped hole 277 is formed in the first clamping block 273, two ends of the wedge-shaped hole 277 are open, and a conical clamping piece assembly 274 for clamping the steel strand 8 is arranged in the wedge-shaped hole 277.
In this embodiment, a baffle 271 for limiting the conical clip assembly 274 is disposed on one side of the first clamp block 273 near the hoist 25, an opening 2711 is disposed on the baffle 271, the diameter of the opening 2711 is smaller than that of the largest diameter end of the conical clip assembly 274, and a hanging ring 272 connected with the hoist 25 is disposed on the outer side of the first clamp block 273.
The diameter of the side, close to the baffle 271, of the wedge-shaped hole 277 is larger than that of the side, far away from the baffle 271, of the lifting ring 272, the lifting ring 272 is in a U shape, the lifting ring 272 is arranged on the outer side of the first clamp block 273 and faces the baffle 271, and the baffle 271 can also be understood as the inside of the U-shaped lifting ring 272, the conical clamping piece assembly 274 is composed of two arc clamping pieces, and the shape of the conical clamping piece assembly 274 is matched with the wedge-shaped hole 277.
The steel strand 8 is placed into the wedge-shaped hole 277 of the first clamp block 273 through the placement opening 278, the first clamp block 273 is sleeved on the outer side of the steel strand 8, then the conical clamping piece assembly 274 is inserted into the wedge-shaped hole 277 from the opening of one side of the first clamp block 273, which is close to the threaded section 2731, and sleeved on the outer side of the steel strand 8, the steel strand 8 is clamped in the wedge-shaped hole 277 by the conical clamping piece assembly 274, after the steel strand 8 is connected for cutting, the first traction mechanism and the second traction mechanism are spirally wound together, the steel strand 8 can automatically rotate after cutting, so that a baffle 271 is required to be fixed at one end, which is close to the first clamp block 273 and has the largest diameter of the wedge-shaped hole 277, the diameter of an opening 2711 of the baffle 271 is larger than the diameter of the steel strand 8 and smaller than the largest diameter of the conical clamping piece assembly 274, and the conical clamping piece assembly 274 can prevent the conical clamping piece assembly 274 from flying out and separating.
Wherein adopt detachable mode to fix between baffle 271 and the first anchor clamps piece 273, seted up first bolt hole on the outer wall of first anchor clamps piece 273, seted up the second bolt hole that corresponds with first bolt hole on the baffle 271, demolish the baffle 271 before needing to install toper clamping piece subassembly 274, after installing toper clamping piece subassembly 274, pass first bolt hole and second bolt hole through the bolt and make baffle 271 and first anchor clamps piece 273 connect fixedly.
The working principle and the working process of the application are as follows:
the first traction mechanism is connected with the steel strand 8 close to the fixed end anchor 4, and the steel strand 8 is tensioned through the first traction mechanism, so that the steel strand 8 at the fixed end anchor 4 is unloaded.
Cutting the steel strand 8 with the force removed, and separating the steel strand 8 connected with the first traction mechanism from the fixed end anchor 4.
And hoisting the steel strand 8 from above the steel strand 8 close to the tension end anchor 10 through the second traction mechanism, and tensioning the hoisted steel strand 8 through the second traction mechanism so as to unload the steel strand 8 at the tension end anchor 10.
Cutting the steel strand 8 with the unloading force, and separating the steel strand 8 connected with the second traction mechanism from the tension end anchor 10.
And removing the residual steel stranded wires 8, and carrying all the removed steel stranded wires 8.
After the steel strands 8 connected with the first traction mechanism and the second traction mechanism are removed, the residual steel strands 8 in the tensioning end anchor 10 and the fixed end anchor 4 are removed, taken out and carried.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or indirectly connected via an intervening medium, or may be in communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for dismantling the long-span steel strand stay cable is characterized by comprising the following steps of:
Connecting the first traction mechanism with the steel strand (8) close to the fixed end anchor (4), and tensioning the steel strand (8) through the first traction mechanism so as to unload the steel strand (8) at the fixed end anchor (4);
Cutting the steel stranded wire (8) with the unloading force, so that the steel stranded wire (8) connected with the first traction mechanism is separated from the fixed end anchor (4);
Hoisting the steel strand (8) from above the steel strand (8) close to the tension end anchor (10) through a second traction mechanism, and tensioning the hoisted steel strand (8) through the second traction mechanism so as to unload the steel strand (8) at the tension end anchor (10);
Cutting the steel strand (8) with the unloading force, so that the steel strand (8) connected with the second traction mechanism is separated from the tensioning end anchor (10);
and removing the residual steel stranded wires (8), and carrying all the removed steel stranded wires (8).
2. The method for removing the long-span steel strand stay cable according to claim 1, wherein:
After the steel stranded wires (8) connected with the first traction mechanism are horizontally placed on the main beam (1), integrally cutting the steel stranded wires (8) placed on the main beam (1) at the root position of the main tower (2), and separating the steel stranded wires (8) connected with the fixed end anchor (4) in a falling state;
And grouping, hoisting, cutting and lowering the steel strands (8) close to the tension end anchor (10).
3. The method for removing the long-span steel strand stay cable according to claim 1, wherein:
wherein after cutting the steel strand (8) which is close to the tension end anchor (10) and is unloaded, the steel strand is continuously suspended by the tension of a second traction mechanism;
then cutting the steel stranded wires (8) close to the root position of the main tower (2) in the suspended steel stranded wires (8) to enable the steel stranded wires (8) falling back on the main beam (1) to be carried;
And then the second traction mechanism is used for lowering the remaining suspended steel strands (8), and after the next group of steel strands (8) are lowered, the steel strands and the next group of steel strands (8) are sequentially lifted, cut and lowered.
4. The method for removing the long-span steel strand stay cable according to claim 1, wherein:
The second traction mechanism makes the steel strands (8) uniformly grouped before connecting the steel strands (8) close to the tension end anchor (10), and hangs a hanging platform (36) on the main tower (2);
the second traction mechanism is sequentially hoisted with each group of steel strands (8) so as to enable the steel strands (8) at the tension end anchorage device (10) corresponding to each group of steel strands (8) to unload force, and simultaneously, the steel strands (8) after unloading force are cut on the suspension platform (36);
and separating the steel stranded wires (8) connected with the second traction mechanism from the tension end anchor (10), and lowering the connected steel stranded wires (8) to the main beam (1) for carrying through the second traction mechanism.
5. The method for removing the long-span steel strand stay cable according to claim 1, wherein:
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 with a steel strand (8) at the fixed end anchor (4) through a first clamp mechanism (27);
the second traction mechanism comprises an electric hoist (28) and a support frame (35) arranged at the top of the main tower (2), the electric hoist (28) is positioned on the main beam (1) and is close to the main tower (2), and the suspension platform (36) is in transmission connection with the support frame (35) through a lifting rope assembly (37);
a first pulley block (281) is arranged on one side of the electric hoist (28), and a second pulley block (282) is arranged on the support frame (35);
the steel wire rope of the electric hoist (28) bypasses the first pulley block (281) to extend towards the second pulley block (282), and then bypasses the second pulley block (282) to extend to the upper side of the steel stranded wire (8) of the tensioning end anchor (10) to be hoisted with the steel stranded wire (8) through the second clamp mechanism (5).
6. The method for removing the long-span steel strand stay cable according to claim 5, wherein:
The first clamp mechanism (27) and the second clamp mechanism (5) comprise a first clamp block (273) and a second clamp block (275) which are connected with each other;
wedge-shaped holes (277) are formed in the first clamp block (273) and the second clamp block (275), and two ends of the wedge-shaped holes are open;
the side walls of the first clamp block (273) and the second clamp block (275) are respectively provided with a placement opening (278) communicated with the wedge-shaped hole (277).
7. The method for removing the long-span steel strand stay cable according to claim 6, wherein:
The opening direction of the placement opening (278) of the first clamp block (273) is opposite to that of the placement opening (278) of the second clamp block (275);
A conical clamping piece assembly (274) used for clamping the steel stranded wires (8) and matched with the wedge-shaped hole (277) is arranged in the wedge-shaped hole (277).
8. The method for removing the long-span steel strand stay cable according to claim 7, wherein:
a threaded section (2731) is arranged on one side of the first clamp block (273), and an internal thread (2751) connected with the threaded section (2731) is arranged in the wedge-shaped hole (277) of the second clamp block (275);
And a hanging ring (272) connected with the winch (25) is arranged on the outer side of the first clamp block (273).
9. The method for removing the long-span steel strand stay cable according to claim 5, wherein:
The first clamp mechanism (27) and the second clamp mechanism (5) comprise a first clamp block (273) for fixedly clamping the steel strand (8), a wedge-shaped hole (277) is formed in the first clamp block (273), and two ends of the wedge-shaped hole are open;
A tapered clip assembly (274) is disposed within the wedge aperture (277) for gripping a steel strand (8).
10. The method for removing the long-span steel strand stay cable according to claim 9, wherein:
a baffle (271) for limiting the conical clamping piece assembly (274) is arranged on one side, close to the winch (25), of the first clamp block (273);
the baffle plate (271) is provided with an opening (2711), and the diameter of the opening (2711) is smaller than the diameter of the largest diameter end of the conical clamping piece assembly (274);
And a hanging ring (272) connected with the winch (25) is arranged on the outer side of the first clamp block (273).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411532426.1A CN119121814A (en) | 2024-10-30 | 2024-10-30 | A method for dismantling a large-span steel strand cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411532426.1A CN119121814A (en) | 2024-10-30 | 2024-10-30 | A method for dismantling a large-span steel strand cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119772643A (en) * | 2025-03-10 | 2025-04-08 | 中国公路工程咨询集团有限公司 | A kind of inclined cable cutting mechanism with fixing function and construction method thereof |
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