Quick release device and quick release method for old parallel steel strand stay cable

Abstract

The invention relates to the field of bridge engineering, and discloses a quick dismounting device and method for an old parallel steel strand stay cable, and the quick dismounting device comprises a loosening device which is used for transferring and anchoring all steel strands of the old parallel steel strand stay cable, assisting in loosening an anchoring nut, and lowering an anchor head until the old parallel steel strand stay cable reaches a stress-free state; the two double-semicircle fastening devices are respectively fastened at the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base of the old parallel steel strand stay cable; the counter-force tensioning device is connected with the double-semicircle fastening device adjacent to the beam end base through a steel wire rope; the lifting and tensioning device is connected with the double-semicircle fastening device adjacent to the tower end base through a steel wire rope; when the two ends of the old parallel steel strand stay cable are cut, the counter-force tensioning device and the lifting tensioning device are matched to lower the old parallel steel strand stay cable. According to the quick dismounting device and the quick dismounting method, the technical problems of long period and low efficiency of one-by-one tensioning dismounting in a traditional method are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge engineering, and particularly relates to a quick dismounting device and method for old parallel steel strand stay cable. BACKGROUND

[0002] With the rapid development of bridge engineering, as a bridge structure with significant advantages, the cable-stayed bridge has been widely used in the construction of long-span bridges. However, during the service life of the cable-stayed bridge, the stay cable may need to be replaced or repaired due to material aging, damage or other reasons, which involves the dismounting work of the old stay cable.

[0003] In the related art, the traditional dismounting method for the old parallel steel strand stay cable usually adopts the way of tensioning one by one, and the old parallel steel strand stay cable is pulled out by using one small jack at a time, that is, the prestress of the steel strand is released one by one and the old parallel steel strand stay cable is dismounted.

[0004] However, although the traditional method is simple to operate, it has problems of long dismounting period, low efficiency and poor safety. Especially for large cable-stayed bridges, the number of stay cables is large, and the dismounting one by one not only consumes a lot of time and manpower. SUMMARY

[0005] The present application provides a quick dismounting device and method for old parallel steel strand stay cable, which solves the technical problems of long dismounting period and low efficiency of the traditional method of tensioning one by one.

[0006] In a first aspect, the present application provides a quick dismounting device for old parallel steel strand stay cable, the top end of the old parallel steel strand stay cable is provided with an anchor head, an anchor pad and an anchor nut, and the quick dismounting device comprises: a loosening device arranged at the top end of the old parallel steel strand stay cable, used for adapting all steel strands of the old parallel steel strand stay cable, used for assisting in loosening the anchor nut, and used for lowering the anchor head to the old parallel steel strand stay cable to reach a stress-free state; two double-semi-circular fastening devices respectively fastened to the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base of the old parallel steel strand stay cable; a counterforce tensioning device connected to the double-semi-circular fastening device adjacent to the beam end base through a steel wire rope; a lifting tensioning device connected to the double-semi-circular fastening device adjacent to the tower end base through a steel wire rope; When the two ends of the old parallel steel strand stay cable in the stress-free state are cut, the counterforce tensioning device and the lifting tensioning device cooperate to lower the old parallel steel strand stay cable.

[0007] In combination with the first aspect, in an embodiment, the double half-circle fastening device comprises two half-circle hoops, both sides of the half-circle hoops are provided with connecting flanges, the connecting flanges of the two half-circle hoops are in close alignment and are fixed by fastening bolts; the connecting flanges are provided in hoisting holes, and the counterforce tensioning device and the lifting tensioning device are connected to the hoisting holes of the double half-circle fastening device by steel wires. The half-circle hoops are provided with fastening bolt holes in the radial direction, and each fastening bolt hole is provided with a long screw rod.

[0008] In combination with the first aspect, in an embodiment, the counterforce tensioning device comprises a counterforce winch and a fixed pulley structure, both of which are fixedly provided on the top surface of the main beam body, and one end of the steel wire wound and connected by the counterforce winch passes through the fixed pulley structure and is connected to the hoisting hole of the double half-circle fastening device of the adjacent beam end base.

[0009] In combination with the first aspect, in an embodiment, the lifting tensioning device comprises a lifting winch and a hanging pulley block, the lifting winch is provided on the top surface of the main beam body, and the hanging pulley block is provided on the side surface of the top end of the bridge tower body through an auxiliary structure; one end of the steel wire wound and connected by the lifting winch passes through the hanging pulley block and is connected to the hoisting hole of the double half-circle fastening device of the adjacent tower end base.

[0010] In combination with the first aspect, in an embodiment, the lifting tensioning device further comprises a turning structure and a lifting hanger, the lifting hanger is provided on the top surface of the bridge tower body, and part of the lifting hanger extends outward. The hanging pulley block is provided on the extended end of the lifting hanger, and one end of the steel wire wound and connected by the lifting winch passes through the turning structure and the hanging pulley block and is connected to the hoisting hole of the double half-circle fastening device of the adjacent tower end base.

[0011] In combination with the first aspect, in an embodiment, the releasing device comprises: A column support frame comprises a support table and a plurality of column bodies, the top ends of all the column bodies are fixed to the support table, and the bottom ends of all the column bodies abut against the anchor pads at the end portions of the old parallel steel strand cable-stayed cables; A through-center jack is provided on the top surface of the support table; An adapter anchor is provided in the space enclosed by the plurality of column bodies, and the adapter anchor is provided with a steel strand connected outward from the anchor head; A tensioning rod passes through the through-center jack and the support table, and the bottom end of the tensioning rod is connected to the adapter anchor.

[0012] In combination with the first aspect, in an embodiment, the support table is provided with a groove with a central opening facing upward, and the tensioning rod passes through the groove; the releasing device further comprises a limiting nut and an adjusting nut, the limiting nut is fixedly arranged at the top end of the tensioning rod, and the adjusting nut is located in the groove and matches the thread of the tensioning rod; The old parallel steel strand cable-stayed cable is lowered by cooperation of the through jack and the adjusting nut.

[0013] In combination with the first aspect, in an embodiment, the adapter anchor comprises a tensioning column and a tensioning anchor, the tensioning column has a downwardly open threaded blind hole, and the tensioning anchor matches the thread of the threaded blind hole; The tensioning anchor is provided with a plurality of through holes, and each through hole clamps and fixes one steel strand by one anchor clamp piece.

[0014] The second aspect provides a quick release method based on the quick release device. The releasing device is installed at the top end of the old parallel steel strand cable-stayed cable, and all the steel strands are adapter anchored; The releasing device pulls out the steel strands until the anchor pad and the anchor nut are separated, and the anchor nut is removed; the releasing device lowers the anchor head until the parallel steel strand cable-stayed cable reaches a stress-free state; The HDPE outer sleeve pipe wrapped around the parallel steel strand cable-stayed cable is removed, two double half circular fastening devices are respectively installed at the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base, and the double half circular fastening devices clamp the bundled steel strands; The counterforce tensioning device is connected to and tensions the double half circular fastening device adjacent to the beam end base through a steel wire rope; the steel strands of the beam end base are cut; the lifting hanger device is connected to and tensions the double half circular fastening device adjacent to the tower end base through a steel wire rope, and the steel strands of the tower end base are cut; the counterforce tensioning device and the lifting hanger device cooperate to lower the old parallel steel strand cable-stayed cable.

[0015] In combination with the second aspect, in an embodiment, the releasing device comprises a column support frame, a through jack, an adapter anchor and a tensioning rod; The column support frame comprises a support table and a plurality of column bodies, the top ends of all the column bodies are fixed to the support table, and the bottom ends of all the column bodies abut against the anchor pad at the end of the old parallel steel strand cable-stayed cable; the through jack is arranged on the top surface of the support table; the adapter anchor is arranged in the space enclosed by the plurality of column bodies, the adapter anchor is connected to the steel strands extending outward from the anchor head one by one; and the tensioning rod passes through the through jack and the support table, and the bottom end of the tensioning rod is connected to the adapter anchor; The steel strands are pulled out, comprising: The through jack pulls out the steel strands through the tensioning rod and the adapter anchor. The releasing device releases the anchor head, comprising: The through jack releases the steel strand and the anchor head through the tensioning rod and the adapter anchor device.

[0016] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects: 1. The quick disassembly device of the present application first connects all the steel strands of the old parallel steel strand cable-stayed cable through the releasing device, then removes the top end structure of the old parallel steel strand cable-stayed cable by using the releasing device, makes the anchor nut loose, and then assists in releasing the anchor head, so that the old parallel steel strand cable-stayed cable changes from a tight state to a stress-free state. Then, the two double half circle fastening devices are used to fasten the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base of the old parallel steel strand cable-stayed cable, respectively, and the counterforce tensioning device and the lifting tensioning device are connected with the two double half circle fastening devices, respectively, to cooperate with the releasing of the old parallel steel strand cable-stayed cable, so as to realize the whole bundle fastening and disassembly. The quick disassembly device has a simple structure, is efficient and convenient to install, and can realize quick and efficient, safe and reliable disassembly. Compared with the traditional method of disassembling the steel strands one by one, the construction period is short, the efficiency is high, and the safety is strong.

[0017] 2. The quick disassembly device of the present application, the hoisting hole is arranged on the connecting flange, which facilitates the subsequent connection of the double half circle fastening device with the corresponding steel wire rope of the counterforce tensioning device and the corresponding steel wire rope of the lifting tensioning device, and the connection is convenient and fast. More importantly, the steel strands are easily loose in the double half circle fastening device. To this end, the half circle hoop body is provided with a plurality of long screws in the radial direction, and the plurality of long screws provide fastening force from multiple directions to fasten the plurality of steel strands in the double half circle fastening device, thereby effectively preventing the steel strands from loosening.

[0018] 3. The quick disassembly device of the present application, in the actual use process, the stand support frame abuts against the anchor pad, the through jack drives the adapter anchor device outward through the tensioning rod, the adapter anchor device drives the steel strand outward, and then drives the anchor head and the anchor nut outward. When the anchor nut no longer abuts against the anchor pad, the anchor nut is removed, the top end structure of the old parallel steel strand cable-stayed cable is loosened, and then the through jack drives the adapter anchor device downward through the tensioning rod, slowly making the steel strand change from a tight state to a stress-free state, and completing the preliminary loosening work of the old parallel steel strand cable-stayed cable disassembly, thereby laying a foundation for the whole disassembly.

[0019] 4. The quick disassembly device of the present application, the limiting nut is used for limiting, the adjusting nut and the through jack cooperate to release the old parallel steel strand cable-stayed cable. In the releasing process of the releasing device, the adjusting nut is first screwed upward by a distance, and then the through jack is released downward by a distance. The adjusting nut can effectively prevent the through jack from releasing too much and being unstable. The limiting nut and the adjusting nut further ensure the safety performance of the whole bundle releasing of the old parallel steel strand cable-stayed cable.

[0020] 5. The quick disassembly method of the present application, first, the end structure of the old parallel steel strand cable is disassembled by the loosening device, then the parallel steel strand cable is lowered by the loosening device to make it from a taut state to a relaxed state; then two additional double half circle fastening devices are added to clamp the steel strand from the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base; then the counterforce tensioning device and the lifting hanger device are connected by the steel wire rope and tension the two double half circle fastening devices; the two ends of the steel strand are cut; the counterforce tensioning device and the lifting hanger device cooperate to lower the old parallel steel strand cable; the whole process is convenient and fast, and can efficiently realize the clamping, lowering and disassembly of the old parallel steel strand cable. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 Application schematic diagram of the quick disassembly device provided by the embodiments of the present application; Figure 2 Structure schematic diagram of the loosening device provided by the embodiments of the present application; Figure 3 End structure schematic diagram of the old parallel steel strand cable; Figure 4 Structure schematic diagram of the double half circle fastening device provided by the embodiments of the present application; Figure 5 Structure schematic diagram of the half circle clamp body of the double half circle fastening device provided by the embodiments of the present application; In the figure: 1, old parallel steel strand cable; 11, HDPE outer sleeve; 12, anchor head; 13, steel strand; 14, anchor pad; 15, anchor nut; 2, double half circle fastening device; 21, half circle clamp body; 22, lock bolt hole; 23, fastening bolt hole; 24, hoisting hole; 100, loosening device; 3, through-hole jack; 4, tensioning rod; 5, tensioning column; 6, tensioning anchor device; 7, column support frame; 8, limiting nut; 9, adjusting nut; 10, support table; 201, counterforce winch; 202, fixed pulley structure; 301, lifting hanger; 302, hanging pulley block; 303, steering structure; 304, lifting winch; 400, main beam body; 500, bridge tower body. DETAILED DESCRIPTION

[0023] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described in the embodiments of the present application in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0024] The embodiment of the present application provides a quick dismounting device for old parallel steel strand cable, which solves the technical problems of long dismounting period and low efficiency of traditional method.

[0025] In the first aspect, the present application discloses a quick dismounting device for old parallel steel strand cable, specifically, the top end structure of the old parallel steel strand cable is a conventional structure, that is, the top end of the old parallel steel strand cable is provided with an anchor head 12, an anchor pad 14 and an anchor nut 15, the anchor head 12 is used for penetrating all steel strands, and the anchor head 12 is threadedly connected with the anchor nut 15, and the anchor nut 15 tightly presses and fits the anchor pad 14 to the tower end base. Further, the outer diameter of the anchor nut 15 is greater than the round hole of the anchor pad 14, and the outer diameter of the anchor head 12 is less than the round hole of the anchor pad 14. Figure 1 The quick dismounting device of the present application comprises a loosening device 100, a counterforce tensioning device, a lifting tensioning device and two double-semi-circular fastening devices 2.

[0026] The loosening device 100 is arranged at the top end of the old parallel steel strand cable 1, and is used for adapting all steel strands 13 of the old parallel steel strand cable 1. Specifically, the loosening device 100 anchors the steel strands 13 extending outward from the anchor head 12. The loosening device 100 is also used for assisting in loosening the anchor nut 15, and after the anchor nut 15 is loosened, the anchor head 12 can be lowered through the anchor pad 14. The loosening device 100 is also used for lowering the anchor head 12 to the old parallel steel strand cable 1 to reach a stress-free state.

[0027] The two double-semi-circular fastening devices 2 are respectively fastened to the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base of the old parallel steel strand cable 1 after the HDPE (High Density Polyethylene) outer sleeve pipe 11 is removed. Specifically, the old parallel steel strand cable 1 to be removed is provided with the HDPE outer sleeve pipe 11 for preventing rust of the steel strands, and the HDPE outer sleeve pipe 11 needs to be removed before the steel strands are cut off.

[0028] The counterforce tensioning device connects the double-semi-circular fastening devices 2 adjacent to the beam end base through a steel wire rope, and provides tensioning force for the old parallel steel strand cable 1 cut off at the bottom end.

[0029] The counterforce tensioning device connects the double-semi-circular fastening devices 2 adjacent to the beam end base through a steel wire rope, and provides tensioning force for the old parallel steel strand cable 1 cut off at the bottom end.

[0030] The lifting tension device is connected to the double half-circle fastening device 2 near the tower end base through a steel wire rope, and provides tension to the old parallel steel strand cable 1 cut at the top end.

[0031] When the two ends of the old parallel steel strand cable 1 in the unstressed state are cut, the counterforce tension device and the lifting tension device cooperate to lower the old parallel steel strand cable 1, and the lowering is stable and safe.

[0032] Specifically, the two ends of the old parallel steel strand cable 1 in the unstressed state need to be cut, and the cutting positions are respectively the gap between the double half-circle fastening device 2 and the top end of the cable guide pipe of the beam end base, and the gap between the double half-circle fastening device 2 and the bottom end of the cable guide pipe of the tower end base.

[0033] The quick release device of the present application first connects all the steel strands 13 of the old parallel steel strand cable 1 through the loosening device 100, then removes the top end structure of the old parallel steel strand cable 1 using the loosening device 100, so that the anchor nut 15 is loosened, and then assists in lowering the anchor head 12, so that the old parallel steel strand cable 1 reaches the unstressed state from the taut state, and then uses two double half-circle fastening devices 2 to fasten the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base of the old parallel steel strand cable 1 respectively, and uses the counterforce tension device and the lifting tension device to connect the two double half-circle fastening devices 2 respectively, and cooperates to lower the old parallel steel strand cable 1, which can realize whole bundle fastening and whole bundle removal, and the quick release device has simple structure, efficient and convenient installation, and can realize quick and efficient, safe and reliable removal. Compared with the traditional method of removing steel strands one by one, the construction period is short, the efficiency is high, and the safety is strong.

[0034] As shown in Figure 4 and Figure 5 In one embodiment, each double half-circle fastening device 2 is provided with a lifting hole 24, and the counterforce tension device and the lifting tension device are connected to the lifting hole 24 of the double half-circle fastening device 2 through a steel wire rope, which is convenient to install and stable to lift.

[0035] In one embodiment, the double half-circle fastening device 2 comprises two half-circle hoop bodies 21, and the two sides of the half-circle hoop body 21 are provided with connecting flanges. The connecting flanges of the two half-circle hoop bodies 21 are fitted and aligned, and are fixed by fastening bolts. The lifting hole 24 is provided on the connecting flange. Specifically, the connecting flange is provided with a plurality of locking bolt holes 22, and a plurality of fastening bolts pass through the plurality of locking bolt holes 22 one by one to fasten the two half-circle hoop bodies 21.

[0036] The semicircular hoop 21 is provided with a plurality of fastening bolt holes 23 along the radial direction, and a long screw is inserted into each fastening bolt hole 23; the plurality of long screws are symmetrically arranged along the mating surfaces of the two semicircular hoops 21. Specifically, the plurality of long screws can provide fastening force from multiple directions, and can tightly fix multiple steel strands to the double semicircular fastening device 2 to prevent the steel strands from loosening.

[0037] The quick-release device of this application has a lifting hole 24 located on the connecting flange, which facilitates the subsequent connection of the double semi-circular fastening device 2 to the corresponding steel wire rope of the reaction tensioning device and the corresponding steel wire rope of the lifting tensioning device, making the connection convenient and quick. More importantly, several steel strands are prone to loosening when encircled within the double semi-circular fastening device 2. To address this, the semi-circular hoop 21 is provided with several long screws along the radial direction. These long screws provide fastening force from multiple directions, which can fasten multiple steel strands to the double semi-circular fastening device 2, effectively preventing the steel strands from loosening.

[0038] Preferably, the outer wall of the semicircular hoop 21 also includes arc-shaped reinforcing ribs, which enhance the structural strength of the semicircular hoop 21.

[0039] like Figure 2 and Figure 3 As shown, the reaction tensioning device includes a reaction winch 201 and a fixed pulley structure 202. Both the reaction winch 201 and the fixed pulley structure 202 are fixedly installed on the top surface of the main beam body 400. One end of the wire rope wound and connected to the reaction winch 201 passes through the fixed pulley structure 202 and is connected to the lifting hole 24 of the double semi-circular fastening device 2 adjacent to the beam end base. Specifically, one end of the wire rope is wound around the reaction winch 201, and the other end is fixed to the lifting hole 24 of the double semi-circular fastening device 2 adjacent to the beam end base.

[0040] The reaction tensioning device is mainly used to tension the bottom end of the old parallel steel strand cable 1 to prevent the old parallel steel strand cable 1 from swinging significantly during subsequent cutting, thus preventing safety accidents and ensuring a smooth and safe lowering.

[0041] In one embodiment, the lifting tensioning device includes a lifting winch 304 and a hanging pulley block 302. The lifting winch 304 is disposed on the top surface of the main beam body 400, and the hanging pulley block 302 is disposed on the top side of the bridge tower body 500 through an auxiliary structure.

[0042] One end of the wire rope of the hoisting winch 304 is passed through the hanging pulley block 302 and connected to the hoisting hole 24 of the double semi-circular fastening device 2 near the tower end base.

[0043] The lifting and tensioning device is mainly used to tension the top of the old parallel steel strand cable 1. Both the top and bottom of the old parallel steel strand cable 1 are tensioned, which can effectively achieve a smooth and safe lowering, providing a structural foundation for the complete dismantling of the cable.

[0044] Further, the lifting tensioning device further comprises a turning structure 303 and a lifting hanger 301, the lifting hanger 301 is arranged on the top surface of the bridge tower body 500, and part of the lifting hanger 301 extends outward and is in a suspended state.

[0045] The hanging pulley block 302 is arranged at the extended end of the lifting hanger 301, and one end of the steel wire rope wound and connected by the lifting winch 304 passes through the turning structure 303, the hanging pulley block 302, and is connected to the lifting hole 24 of the double-semicircular fastening device 2 adjacent to the tower end base.

[0046] Specifically, the turning structure 303 and the hanging pulley block 302 are mainly used for turning the steel wire rope, so that the lifting winch 304 and the counterforce winch 201 can be arranged on the top surface of the main girder body 400, facilitating operation and assisting in lowering the old parallel steel strand cable-stayed cable.

[0047] In one embodiment, the loosening device 100 comprises a column support frame 7, a through-hole jack 3, an adapter anchor device, and a tensioning rod 4.

[0048] The column support frame 7 comprises a support table 10 and a plurality of column bodies, the top ends of all the column bodies are fixed to the support table 10, and the bottom ends of all the column bodies abut against the anchor pad 14 at the end of the old parallel steel strand cable-stayed cable 1. The column support frame 7 forms the support base of the entire structure.

[0049] The through-hole jack 3 is arranged on the top surface of the support table 10.

[0050] The adapter anchor device is arranged in the space enclosed by the plurality of column bodies, and the adapter anchor device is arranged in the space enclosed by the plurality of column bodies. Specifically, the space is enclosed by the plurality of column bodies, the support table 10, and the anchor head 12, and the adapter anchor device is installed in the space.

[0051] The tensioning rod 4 passes through the through-hole jack 3 and the support table 10, and the bottom end of the tensioning rod 4 is connected to the adapter anchor device. Specifically, the through-hole jack 3 can drive the tensioning rod 4 to move up and down to provide driving force.

[0052] In actual use, the quick release device of the present application, the column support frame 7 abuts against the anchor pad 14, the through-hole jack 3 drives the adapter anchor device to move outward through the tensioning rod 4, the adapter anchor device drives the steel strand 13 to move outward, and then drives the anchor head 12 and the anchor nut 15 to move outward. When the anchor nut 15 no longer abuts against the anchor pad 14, the anchor nut 15 is removed, the top end structure of the old parallel steel strand cable-stayed cable 1 is loosened, and then the through-hole jack 3 drives the adapter anchor device to move downward through the tensioning rod 4, slowly making the steel strand 13 from a tight state to a stress-free state, completing the preliminary loosening work of the old parallel steel strand cable-stayed cable 1 and laying a foundation for the entire disassembly.

[0053] Specifically, the tension rod 4 can set its length as needed, and can also be lengthened during use.

[0054] Further, the support table 10 is provided with a groove with an upwardly open central opening, and the tension rod 4 passes through the groove.

[0055] The releasing device 100 further comprises a limiting nut 8 and an adjusting nut 9. The limiting nut 8 is fixedly arranged at the top end of the tension rod 4, and is used for limiting the tension rod 4 from being separated from the through-rod jack 3 due to excessive lowering of the through-rod jack 3 during the lowering process.

[0056] The adjusting nut 9 is located in the groove and is threadedly matched with the tension rod 4. The tension rod 4 is provided with an outer thread in the circumferential direction, and the adjusting nut 9 is provided with an inner thread, which are matched with each other. The through-rod jack 3 and the adjusting nut 9 cooperate to lower the old parallel steel strand cable 1.

[0057] During the lowering process of the releasing device 100, the adjusting nut 9 is first screwed upward by a distance, and then the through-rod jack 3 is lowered by a distance. The adjusting nut 9 can effectively prevent the through-rod jack 3 from being lowered by too large an amplitude and being unstable.

[0058] The quick release device of the present application is provided with the limiting nut 8 for limiting, the adjusting nut 9 and the through-rod jack 3 for cooperating to lower the old parallel steel strand cable 1, and during the lowering process of the releasing device 100, the adjusting nut 9 is first screwed upward by a distance, and then the through-rod jack 3 is lowered by a distance. The adjusting nut 9 can effectively prevent the through-rod jack 3 from being lowered by too large an amplitude and being unstable. The limiting nut 8 and the adjusting nut 9 further ensure the safety performance of the whole bundle of the old parallel steel strand cable 1.

[0059] In one embodiment, the adapter anchor comprises a tensioning column 5 and a tensioning anchor 6. The tensioning column 5 is provided with a threaded blind hole with a downward opening, and the tensioning anchor 6 is threadedly matched with the threaded blind hole.

[0060] The tensioning anchor 6 is provided with a plurality of through holes. Each through hole clamps and fixes one steel strand by one anchor clamping piece. The plurality of through holes clamp all the steel strands 13 of the old parallel steel strand cable 1 by the anchor clamping pieces.

[0061] The adapter anchor is divided into two parts, which is convenient for subsequent installation and disassembly.

[0062] Preferably, the bottom of the tension rod 4 is provided with a circular plate, and the top ends of all the steel strands 13 are adjacent to the circular plate.

[0063] Specifically, the axes of the tensioning column 5, the tensioning anchor 6, the threaded blind hole, the groove of the support table 10, the tension rod 4, the limiting nut 8 and the adjusting nut 9 are all coaxial.

[0064] In one embodiment, the tensioning column 5 and the tensioning anchor 6 are both cylindrical, and the outer diameter of the tensioning column 5 is equal to the anchor head 12 at the end of the old parallel steel strand cable-stayed cable 1, and the outer diameters of the tensioning column 5 and the anchor head 12 are both smaller than the inner diameter of the reserved hole of the anchor pad 14, so that after the anchor nut 15 is removed, the tensioning column 5 and the anchor head 12 can both pass through the inner diameter of the reserved hole of the anchor pad 14, and then be lowered.

[0065] In a second aspect, the application further discloses a quick release method based on the quick release device described above, comprising the steps of: The release device 100 is installed at the top end of the old parallel steel strand cable-stayed cable 1 and anchors all the steel strands 13. Specifically, all the steel strands 13 are originally anchored to the anchor head 12, and the release device 100 further re-anchors all the steel strands 13 extending from the anchor head 12, facilitating external pulling.

[0066] The release device 100 pulls the steel strands 13 outward until the anchor pad 14 and the anchor nut 15 are separated, and the anchor nut 15 is removed, i.e., the end structure of the old parallel steel strand cable-stayed cable 1 is adjusted from fastening to loosening. The release device 100 lowers the anchor head 12 until the parallel steel strand cable-stayed cable 1 reaches a stress-free state, i.e., the parallel steel strand cable-stayed cable 1 changes from a taut state to a relaxed state.

[0067] The HDPE outer sleeve pipe 11 wrapped around the parallel steel strand cable-stayed cable 1 is removed, and two double-semi-circular fastening devices 2 are respectively installed at the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base. The double-semi-circular fastening device 2 tightly clamps the bundled steel strands 13, facilitating subsequent cutting and lowering.

[0068] The counterforce tensioning device connects and tensions the double-semi-circular fastening device 2 adjacent to the beam end base through a steel wire rope, provides a tensioning force, cuts the steel strands 13 of the beam end base, and at this time the bottom end of the cut steel strands 13 remains stationary. The lifting hanger device connects and tensions the double-semi-circular fastening device 2 adjacent to the tower end base through a steel wire rope, provides a tensioning force, cuts the steel strands 13 of the tower end base, and at this time the top end of the cut steel strands 13 remains stationary. Then, the counterforce tensioning device and the lifting hanger device cooperate to lower the old parallel steel strand cable-stayed cable 1.

[0069] The quick disassembly method of the present application first disassembles the end structure of the old parallel steel strand cable 1 through the loosening device 100, and then lowers the parallel steel strand cable 1 from the loosening device 100 to make it from a taut state to a relaxed state; then two additional double half circle fastening devices 2 are added to clamp the steel strands from the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base; then the counterforce tensioning device and the lifting hanger device are connected by a steel wire rope and tension the two double half circle fastening devices 2; the two ends of the steel strands are cut; the counterforce tensioning device and the lifting hanger device cooperate to lower the old parallel steel strand cable 1; the whole process is convenient and fast, and can efficiently realize the clamping and lowering of the whole bundle, and the disassembly efficiency of the old parallel steel strand cable 1 is high.

[0070] It is worth noting that after cutting, the remaining steel strands inside the cable guide pipe of the beam end base and the cable guide pipe of the tower end base can be additionally and separately extracted.

[0071] In one embodiment, the loosening device 100 includes a column support frame 7, a through-hole jack 3, an adapter anchor and a tensioning rod 4.

[0072] The column support frame 7 includes a support table 10 and a plurality of column bodies, the top ends of all the column bodies are fixed to the support table 10, and the bottom ends of all the column bodies abut against the anchor pad 14 at the end of the old parallel steel strand cable 1. The column support frame 7 forms the support base of the whole structure.

[0073] The through-hole jack 3 is arranged on the top surface of the support table 10.

[0074] The adapter anchor is arranged in the space enclosed by the plurality of column bodies, and the adapter anchor is connected to the steel strands 13 extending outward from the anchor head 12. Specifically, the space is enclosed by the plurality of column bodies, the support table 10 and the anchor head 12, and the adapter anchor is installed in the space.

[0075] The tensioning rod 4 passes through the through-hole jack 3 and the support table 10, and the bottom end of the tensioning rod 4 is connected to the adapter anchor. Specifically, the through-hole jack 3 can drive the tensioning rod 4 to move up and down, providing driving force.

[0076] Pulling the steel strands 13 out, includes: The through-hole jack 3 pulls the steel strands 13 out through the tensioning rod 4 and the adapter anchor The loosening device 100 lowers the anchor head 12, including: The through-hole jack 3 lowers the steel strands 13 and the anchor head 12 through the tensioning rod 4 and the adapter anchor.

[0077] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] It should be noted that in the present application, relational terms such as "first" and "second", and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0079] The above is only a specific embodiment of the present application, which enables those skilled in the art to 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 these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A quick release device for old parallel steel strand cable, the top end of the old parallel steel strand cable is provided with an anchor head (12), an anchor backing plate (14) and an anchor nut (15), characterized in that, The quick release device comprises: a loosening device (100) arranged at the top end of the old parallel steel strand cable (1), used for connecting all steel strands (13) of the old parallel steel strand cable (1) anchored, used for assisting in loosening the anchor nut (15), and used for lowering the anchor head (12) to the old parallel steel strand cable (1) to reach a stress-free state; two half-circle fastening devices (2) respectively fastened to the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base of the old parallel steel strand cable (1); a counterforce tensioning device connected to the half-circle fastening device (2) adjacent to the beam end base through a steel wire rope; a lifting tensioning device connected to the half-circle fastening device (2) adjacent to the tower end base through a steel wire rope; when the two ends of the old parallel steel strand cable (1) in the stress-free state are cut, the counterforce tensioning device and the lifting tensioning device cooperate to lower the old parallel steel strand cable (1).

2. The quick release device of the old parallel steel strand cable according to claim 1, wherein: the half-circle fastening device (2) comprises two half-circle hoops (21), the two sides of the half-circle hoops (21) are provided with connecting flanges, the connecting flanges of the two half-circle hoops (21) are matched and aligned and are fixed by fastening bolts; the connecting flanges are provided with hoisting holes (24), and the counterforce tensioning device and the lifting tensioning device are connected to the hoisting holes (24) of the half-circle fastening device (2) through steel wire ropes; the half-circle hoops (21) are provided with a plurality of fastening bolt holes (23) in the radial direction, a long screw rod is arranged in each fastening bolt hole (23), and the plurality of long screw rods are symmetrically arranged along the abutting surface of the two half-circle hoops (21).

3. The quick release device of the old parallel steel strand cable according to claim 2, wherein: the counterforce tensioning device comprises a counterforce winch (201) and a fixed pulley structure (202), and the counterforce winch (201) and the fixed pulley structure (202) are fixedly arranged on the top surface of the main beam body (400); one end of the steel wire rope wound and connected by the counterforce winch (201) passes through the fixed pulley structure (202) and is connected to the hoisting hole (24) of the half-circle fastening device (2) adjacent to the beam end base.

4. The quick release device of the old parallel steel strand cable according to claim 2, wherein: the lifting tensioning device comprises a lifting winch (304) and a hanging pulley block (302), the lifting winch (304) is arranged on the top surface of the main beam body (400), and the hanging pulley block (302) is arranged on the top end side surface of the bridge tower body (500) through an auxiliary structure; one end of the steel wire rope wound and connected by the lifting winch (304) passes through the hanging pulley block (302) and is connected to the hoisting hole (24) of the half-circle fastening device (2) adjacent to the tower end base.

5. The quick release device of the old parallel steel strand cable according to claim 4, wherein: The lifting tension device further comprises a turning structure (303) and a lifting hanger (301), the lifting hanger (301) is arranged on the top surface of the bridge tower body (500), and part of the lifting hanger (301) extends outward; The hanging pulley block (302) is arranged on the extended end of the lifting hanger (301), one end of the steel wire rope wound by the lifting winch (304) passes through the turning structure (303) and the hanging pulley block (302) and is connected to the hoisting hole (24) of the double-semicircle fastening device (2) adjacent to the tower end base.

6. The quick release device of the old parallel steel strand cable-stayed cable according to claim 1, characterized in that the releasing device (100) comprises: The releasing device (100) comprises: The column support frame (7) comprises a support table (10) and a plurality of column bodies, the top ends of all the column bodies are fixed to the support table (10), and the bottom ends of all the column bodies abut against the anchor pad (14) at the end of the old parallel steel strand cable-stayed cable (1); The through jack (3) is arranged on the top surface of the support table (10); The adapter anchor is arranged in the space enclosed by the plurality of column bodies, and the adapter anchor is connected to the steel strand (13) extending outward from the anchor head (12); The tension rod (4) passes through the through jack (3) and the support table (10), and the bottom end of the tension rod (4) is connected to the adapter anchor.

7. The quick release device of the old parallel steel strand cable-stayed cable according to claim 6, characterized in that: The support table (10) is provided with a groove with a central opening facing upward, and the tension rod (4) passes through the groove; the releasing device (100) further comprises a limiting nut (8) and an adjusting nut (9), the limiting nut (8) is fixedly arranged at the top end of the tension rod (4), the adjusting nut (9) is located in the groove, and the adjusting screw (9) is matched with the tension rod (4); The through jack (3) and the adjusting nut (9) cooperate to lower the old parallel steel strand cable-stayed cable (1).

8. The quick release device of the old parallel steel strand cable-stayed cable according to claim 6, characterized in that: The adapter anchor comprises a tension column (5) and a tension anchor (6), the tension column (5) has a threaded blind hole with a downward opening, and the tension anchor (6) is threadedly matched with the threaded blind hole; The tension anchor (6) is provided with a plurality of through holes, each through hole clamps and fixes one steel strand by one anchor clamping piece.

9. A quick release method based on the quick release device of claim 1, characterized in that, The steps comprise: The releasing device (100) is installed at the top end of the old parallel steel strand cable-stayed cable (1), and all the steel strands (13) are adapter anchored; The releasing device (100) pulls out the steel strands (13) until the anchor pad (14) and the anchor nut (15) are separated, and the anchor nut (15) is removed; the releasing device (100) lowers the anchor head (12) until the parallel steel strand cable-stayed cable (1) reaches a stress-free state; The HDPE outer sleeve (11) wrapped in the parallel steel strand cable (1) is removed, two double half circle fastening devices (2) are respectively installed at the top end of the cable guide pipe of the beam end base and the bottom end of the cable guide pipe of the tower end base, the double half circle fastening device (2) clamps the whole bundle of steel strands (13); The counterforce tensioning device is connected with the double half circle fastening device (2) near the beam end base through a steel wire rope and tensions the double half circle fastening device (2); the steel strands (13) of the beam end base are cut; the lifting hanger device is connected with the double half circle fastening device (2) near the tower end base through a steel wire rope and tensions the double half circle fastening device (2), the steel strands (13) of the tower end base are cut; the old parallel steel strand cable (1) is lowered by the counterforce tensioning device and the lifting hanger device.

10. The quick release method of claim 9, wherein: The releasing device (100) comprises a column support frame (7), a through-hole jack (3), an adapter anchor and a tensioning rod (4); The column support frame (7) comprises a support table (10) and a plurality of column bodies, the top ends of all the column bodies are fixed to the support table (10), and the bottom ends of all the column bodies abut against the anchor pad (14) at the end of the old parallel steel strand cable (1); the through-hole jack (3) is arranged on the top surface of the support table (10); the adapter anchor is arranged in the space enclosed by the plurality of column bodies, the adapter anchor is connected with the steel strands (13) extending outward from the anchor head (12) one by one; the tensioning rod (4) passes through the through-hole jack (3) and the support table (10), and the bottom end of the tensioning rod (4) is connected to the adapter anchor; The external pulling of the steel strands (13) comprises: The through-hole jack (3) pulls the steel strands (13) outward through the tensioning rod (4) and the adapter anchor; The releasing device (100) lowers the anchor head (12), which comprises: The through-hole jack (3) lowers the steel strands (13) and the anchor head (12) through the tensioning rod (4) and the adapter anchor.

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