A quick release device for old parallel steel strand cable

Abstract

The application relates to the field of bridge engineering and discloses a quick dismounting device for old parallel steel strand stay cables, which comprises a loosening device for switching all steel strands of the anchored old parallel steel strand stay cables, a device for assisting in loosening the anchor nut, a device for lowering the anchor head to the old parallel steel strand stay cables 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 of the old parallel steel strand stay cables and the bottom end of the cable guide pipe of the tower end base, a counterforce tensioning device connected to the double-semi-circular fastening device adjacent to the beam end base through a steel wire rope, and 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 cables 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 cables. The quick dismounting device solves the technical problems of long dismounting period and low efficiency of the traditional method of tensioning and dismounting the cables one by one.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering, specifically to a quick-release device for old parallel steel strand cable stays. Background Technology

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

[0003] In related technologies, the traditional method for dismantling old parallel steel strand stay cables usually involves releasing the tension one strand at a time, using small jacks to pull them out one by one, that is, releasing the prestress of the steel strands one by one and dismantling them.

[0004] However, while traditional methods are simple to operate, they suffer from problems such as long dismantling cycles, low efficiency, and poor safety. This is especially true for large cable-stayed bridges with numerous stay cables, where dismantling each cable individually is not only time-consuming and labor-intensive. Summary of the Invention

[0005] This application provides a quick-release device for old parallel steel strand cable stays, which solves the technical problems of long cycle and low efficiency of traditional methods of cable laying and dismantling one cable at a time.

[0006] This application provides a quick-release device for an 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 plate, and an anchor nut. The quick-release device includes: The loosening device is set at the top of the old parallel steel strand cable and is used to transfer all the steel strands anchored in the old parallel steel strand cable. It is used to assist in loosening the anchor nuts and to lower the anchor head until the old parallel steel strand cable reaches a stress-free state. Two double semi-circular fastening devices are respectively fastened to the top end of the cable guide tube of the beam end base and the bottom end of the cable guide tube of the tower end base of the old parallel steel strand cable; The reaction tensioning device is connected to the double semi-circular fastening device of the adjacent beam end base by a steel wire rope. The tensioning device is lifted and connected to a double semi-circular fastening device near the tower end base via a steel wire rope. When the two ends of the old parallel steel strand cable are cut in a stress-free state, the reaction tensioning device and the lifting tensioning device work together to lower the old parallel steel strand cable.

[0007] In one embodiment, in conjunction with the above technical solutions, each of the double semicircular fastening devices is provided with a lifting hole; the reaction tensioning device and the lifting tensioning device are both connected to the lifting hole of the double semicircular fastening device by steel wire rope.

[0008] In one embodiment, in conjunction with the above technical solution, the double semi-circular fastening device includes two semi-circular hoops, each with a connecting flange on both sides. The connecting flanges of the two semi-circular hoops are fitted and aligned and fixed together by fastening bolts. The lifting hole is located on the connecting flange. The semi-circular hoops are provided with a plurality of fastening bolt holes along the radial direction, and a long screw is inserted into each fastening bolt hole. The plurality of long screws are symmetrically arranged along the mating surfaces of the two semi-circular hoops.

[0009] In one embodiment, in conjunction with the above technical solutions, the reaction tensioning device includes a reaction winch and a fixed pulley structure. Both the reaction winch and the fixed pulley structure are fixedly installed on the top surface of the main beam body. One end of the wire rope wound and connected by the reaction winch passes through the fixed pulley structure and is connected to the hoisting hole of the double semi-circular fastening device adjacent to the beam end base.

[0010] In one embodiment, in conjunction with the above technical solutions, the lifting and tensioning device includes a lifting winch and a hanging pulley block. The lifting winch is located on the top surface of the main beam body, and the hanging pulley block is located on the side of the top of the bridge tower body through an auxiliary structure. One end of the steel wire rope wound and connected by the lifting winch passes through the hanging pulley block and is connected to the lifting hole of the double semi-circular fastening device adjacent to the tower end base.

[0011] In one embodiment, in conjunction with the above technical solutions, the lifting and tensioning device further includes a steering structure and a lifting hanger, wherein the lifting hanger is disposed on the top surface of the bridge tower body, and part of the lifting hanger extends outward; The hanging pulley block is located at the extended end of the lifting frame, and one end of the wire rope of the lifting winch passes through the steering structure. The hanging pulley block is connected to the lifting hole of the double semi-circular fastening device near the tower end base.

[0012] In one embodiment, based on the above technical solutions, the release device includes: The column support frame includes a support platform and several column bodies. The top of all column bodies is fixed to the support platform, and the bottom of all column bodies abuts against the anchor plate at the end of the old parallel steel strand cable. A through-hole jack is installed on the top surface of the support platform; The transition anchor is set in the space enclosed by several column bodies, and each transition anchor is connected to a steel strand extending outward from the anchor head. The tension rod passes through the through-hole jack and the support platform, and its bottom end is connected to the adapter anchor.

[0013] In one embodiment, based on the above technical solutions, the support platform is provided with a groove with the central opening facing upwards, and the tension rod passes through the groove; the release device also includes a limiting nut and an adjusting nut, the limiting nut is fixedly set at the top of the tension rod, the adjusting nut is located in the groove, and the adjusting nut matches the tension rod; the through-hole jack and the adjusting nut cooperate to lower the old parallel steel strand cable.

[0014] In one embodiment, in conjunction with the above technical solutions, the transition anchor includes a tensioning column and a tensioning anchor. The tensioning column has a downward-opening threaded blind hole, and the thread of the tensioning anchor matches the threaded blind hole. The tensioning anchor has several through holes, and each through hole clamps and fixes a steel strand through an anchor clamp.

[0015] In one embodiment, in conjunction with the above technical solutions, both the tensioning column and the tensioning anchor are cylindrical, and the outer diameter of the tensioning column is equal to the anchor head at the end of the old parallel steel strand cable, and the outer diameters of both the tensioning column and the anchor head are smaller than the inner diameter of the reserved hole in the anchor plate.

[0016] The beneficial effects of the technical solutions provided in this application include at least the following: 1. The quick-release device of this application first transfers all the steel strands of the old parallel steel strand stay cable to anchor through a loosening device. Then, the top structure of the old parallel steel strand stay cable is removed using the loosening device, causing the anchor nuts to loosen. Then, the anchor head is lowered with assistance, allowing the old parallel steel strand stay cable to go from a taut state to a stress-free state. Afterwards, two double semi-circular fastening devices are used to fasten the top end of the cable guide tube of the beam end base and the bottom end of the cable guide tube of the tower end base of the old parallel steel strand stay cable respectively. The two double semi-circular fastening devices are connected by a reaction tensioning device and a lifting tensioning device respectively. With the lowering of the old parallel steel strand stay cable, the entire bundle can be fastened and dismantled. The quick-release device has a simple structure, is highly efficient and convenient to install, and can achieve fast, efficient, safe and reliable dismantling. Compared with the traditional method of releasing and dismantling steel strands one by one, the construction period is short, the efficiency is high, and the safety is strong.

[0017] 2. The quick-release device of this application has a lifting hole located on the connecting flange, which facilitates the subsequent connection of the double semi-circular fastening device 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. To address this, several long screws are arranged radially on the semi-circular hoop, which provide fastening force from multiple directions, effectively securing multiple steel strands to the double semi-circular fastening device and preventing the steel strands from loosening.

[0018] 3. In actual use, the quick-release device of this application, the column support is held against the anchor plate, the through-hole jack drives the transfer anchor to pull outward through the tension rod, the transfer anchor drives the steel strand to pull outward, and then drives the anchor head and anchor nut to move outward. When the anchor nut is no longer held against the anchor plate, the anchor nut is removed, the top structure of the old parallel steel strand cable is loosened, and then the through-hole jack drives the transfer anchor to lower down through the tension rod, slowly making the steel strand go from a taut state to a stress-free state, completing the preliminary loosening work for the removal of the old parallel steel strand cable, laying the foundation for the entire dismantling.

[0019] 4. In the quick-release device of this application, the limiting nut is used for extreme limiting. The adjusting nut and the through-hole jack work together to lower the old parallel steel strand cable. During the lowering process of the release device, the adjusting nut is first turned upwards a certain distance, and then the through-hole jack is lowered a certain distance. The adjusting nut can effectively prevent the through-hole jack from lowering too much and causing instability. The limiting nut and the adjusting nut further ensure the safety performance of the entire bundle of old parallel steel strand cable. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram illustrating the application of the quick-release device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the release device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the end structure of an old parallel steel strand cable-stayed bridge. Figure 4 This is a schematic diagram of the structure of the double semi-circular fastening device provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the semicircular hoop of the double semicircular fastening device provided in the embodiments of this application; In the diagram: 1. Old parallel steel strand cable; 11. HDPE outer casing; 12. Anchor head; 13. Steel strand; 14. Anchor plate; 15. Anchor nut; 2. Double semi-circular fastening device; 21. Semi-circular hoop; 22. Locking bolt hole; 23. Fastening bolt hole; 24. Lifting hole; 100. Release device; 3. Through-hole jack; 4. Tensioning rod; 5. Tensioning column; 6. Tensioning anchor; 7. Column support; 8. Limit nut; 9. Adjusting nut; 10. Support platform; 201. Reaction winch; 202. Fixed pulley structure; 301. Lifting frame; 302. Suspension pulley block; 303. Steering structure; 304. Lifting winch; 400, main beam body; 500, bridge tower body. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0023] This application provides a quick-release device for old parallel steel strand stay cables, solving the technical problems of long cycle and low efficiency of traditional methods of laying and dismantling cables one by one.

[0024] like Figure 1 This application discloses a quick-release device for a conventional parallel steel strand stay cable. Specifically, the top structure of the conventional parallel steel strand stay cable is a conventional structure, namely, the top of the conventional parallel steel strand stay cable is provided with an anchor head 12, an anchor plate 14, and an anchor nut 15. The anchor head 12 is used to thread all the steel strands, and the anchor head 12 is threadedly connected to the anchor nut 15. The anchor nut 15 presses the anchor plate 14 tightly against the tower end base. Further, the outer diameter of the anchor nut 15 is larger than the circular hole of the anchor plate 14, and the outer diameter of the anchor head 12 is smaller than the circular hole of the anchor plate 14.

[0025] The quick-release device of this application includes a release device 100, a reaction tensioning device, a lifting tensioning device, and two double semi-circular fastening devices 2.

[0026] The loosening device 100 is located at the top of the old parallel steel strand stay cable 1. The loosening device 100 is used to transfer and anchor all the steel strands 13 of the old parallel steel strand stay cable 1. Specifically, the loosening device 100 anchors the steel strands 13 that extend outward from the anchor head 12. The loosening device 100 also assists in loosening the anchor nut 15. After the anchor nut 15 is loosened, the anchor head 12 can be lowered through the anchor plate 14. The loosening device 100 is also used to lower the anchor head 12 until the old parallel steel strand stay cable 1 reaches a stress-free state.

[0027] Two double semi-circular fastening devices 2 are respectively fastened to the top end of the cable guide tube at the beam end base and the bottom end of the cable guide tube at the tower end base of the old parallel steel strand stay cable 1 after the HDPE (High Density Polyethylene) outer sleeve 11 has been removed. Specifically, the old parallel steel strand stay cable 1 to be removed is equipped with an HDPE outer sleeve 11 to prevent the steel strand from rusting, and the HDPE outer sleeve 11 needs to be removed before cutting the steel strand.

[0028] The reaction tensioning device is connected to the double semi-circular fastening device 2 of the adjacent beam end base by a steel wire rope, and provides tension to the old parallel steel strand cable 1 cut off at the bottom.

[0029] The lifting tensioning device is connected to the double semi-circular fastening device 2 near the tower end base via a steel wire rope, and provides tension to the old parallel steel strand cable 1 cut off at the top.

[0030] When the two ends of the old parallel steel strand cable 1 in a stress-free state are cut, the reaction tensioning device and the lifting tensioning device work together to lower the old parallel steel strand cable 1, and the lowering is stable and safe.

[0031] Specifically, both ends of the old parallel steel strand cable 1 in the stress-free state need to be cut. The cutting locations are the gap between the double semi-circular fastening device 2 and the top of the cable guide tube of the beam end base, and the gap between the double semi-circular fastening device 2 and the bottom of the cable guide tube of the tower end base.

[0032] The quick-release device of this application first uses a loosening device 100 to transfer all the steel strands 13 of the old parallel steel strand stay cable 1 to anchor them. Then, the loosening device 100 is used to remove the top structure of the old parallel steel strand stay cable 1, so that the anchoring nut 15 is loosened. Then, the anchor head 12 is lowered to allow the old parallel steel strand stay cable 1 to go from a taut state to a stress-free state. After that, two double semi-circular fastening devices 2 are used to fasten the top end of the cable guide tube of the beam end base and the bottom end of the cable guide tube of the tower end base of the old parallel steel strand stay cable 1 respectively. The two double semi-circular fastening devices 2 are connected by a reaction tensioning device and a lifting tensioning device respectively. With the lowering of the old parallel steel strand stay cable 1, the entire bundle can be fastened and dismantled. The quick-release device has a simple structure, is highly efficient and convenient to install, and can achieve fast, efficient, safe and reliable dismantling. Compared with the traditional method of releasing and dismantling steel strands one by one, the construction period is short, the efficiency is high and the safety is strong.

[0033] like Figure 4 and Figure 5 As shown, in one embodiment, each double semicircular fastening device 2 is provided with a lifting hole 24. The reaction tensioning device and the lifting tensioning device are both connected to the lifting hole 24 of the double semicircular fastening device 2 by steel wire rope, which makes installation convenient and lifting stable.

[0034] In one embodiment, the double semi-circular fastening device 2 includes two semi-circular hoops 21. Connecting flanges are provided on both sides of each semi-circular hoop 21. The connecting flanges of the two semi-circular hoops 21 are aligned and connected by fastening bolts. Lifting holes 24 are provided on the connecting flanges. Specifically, the connecting flanges are provided with several locking bolt holes 22, through which several fastening bolts pass to fasten the two semi-circular hoops 21.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Furthermore, the lifting tensioning device also includes a steering structure 303 and a lifting hanger 301. The lifting hanger 301 is located 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.

[0044] The hanging pulley block 302 is installed at the extended end of the lifting frame 301. One end of the wire rope connected to the lifting winch 304 passes through the steering structure 303. The hanging pulley block 302 is connected to the lifting hole 24 of the double semi-circular fastening device 2 near the tower end base.

[0045] Specifically, the steering structure 303 and the hanging pulley block 302 are mainly used to turn the wire rope, so that the hoisting winch 304 and the reaction winch 201 can be set on the top surface of the main beam 400 for easy operation and to assist in lowering the old parallel steel strand cable.

[0046] In one embodiment, the release device 100 includes a column support 7, a through jack 3, a transition anchor and a tension rod 4.

[0047] The column support frame 7 includes a support platform 10 and several column bodies. The top of all column bodies is fixed to the support platform 10, and the bottom of all column bodies abuts against the anchor plate 14 at the end of the old parallel steel strand stay cable 1. The column support frame 7 forms the supporting foundation for the entire structure.

[0048] The through-hole jack 3 is set on the top surface of the support platform 10.

[0049] The transition anchor is installed within the space enclosed by several column bodies, and each transition anchor is connected to a steel strand 13 extending outward from the anchor head 12. Specifically, the space is formed by the several column bodies, the support platform 10, and the anchor head 12, and the transition anchor is installed in this space.

[0050] The tension rod 4 passes through the through-hole jack 3 and the support platform 10, and the bottom end of the tension rod 4 is connected to the adapter anchor. Specifically, the through-hole jack 3 can drive the tension rod 4 to move up and down, providing driving force.

[0051] In actual use, the quick-release device 100 of this application has the column support 7 abutting against the anchor plate 14. The through-hole jack 3 drives the transfer anchor to pull outward through the tension rod 4. The transfer anchor drives the steel strand 13 to pull outward, which in turn drives the anchor head 12 and the anchor nut 15 to move outward. When the anchor nut 15 no longer abuts against the anchor plate 14, the anchor nut 15 is removed, and the top structure of the old parallel steel strand cable 1 is loosened. Then, the through-hole jack 3 drives the transfer anchor to lower down through the tension rod 4, slowly allowing the steel strand 13 to go from a taut state to a stress-free state, completing the preliminary loosening work for the removal of the old parallel steel strand cable 1, laying the foundation for the entire dismantling.

[0052] Specifically, the tension rod 4 can be set to its own length as needed, or it can be extended during use.

[0053] Furthermore, the support platform 10 is provided with a groove with the central opening facing upwards, through which the tension rod 4 passes.

[0054] The release device 100 also includes a limit nut 8 and an adjusting nut 9. The limit nut 8 is fixedly installed at the top of the tension rod 4 for extreme limit, preventing the tension rod 4 from separating from the through jack 3 during the lowering process due to excessive lowering.

[0055] The adjusting nut 9 is located within the groove, and its thread matches that of the tension rod 4. The tension rod 4 has an external thread in its circumference, while the adjusting nut 9 has an internal thread, and the two are matched. The through-hole jack 3 and the adjusting nut 9 work together to lower the old parallel steel strand cable 1.

[0056] During the lowering process of the release device 100, the adjusting nut 9 is first turned upwards a certain distance, and then the through-hole jack 3 is lowered a certain distance. The adjusting nut 9 can effectively prevent the through-hole jack 3 from being lowered too much and causing instability.

[0057] In this application's quick-release device, the limiting nut 8 is used for extreme limiting, and the adjusting nut 9 and the through-hole jack 3 work together to lower the old parallel steel strand cable 1. During the lowering process of the release device 100, the adjusting nut 9 is first turned upwards a certain distance, and then the through-hole jack 3 is lowered a certain distance. The adjusting nut 9 can effectively prevent the through-hole jack 3 from lowering too much and causing instability. The limiting nut 8 and the adjusting nut 9 further ensure the safety performance of the entire bundle of old parallel steel strand cable 1 being lowered.

[0058] In one embodiment, the transition anchor includes a tensioning column 5 and a tensioning anchor 6, the tensioning column 5 having a downward-opening threaded blind hole, and the tensioning anchor 6 having threads that match the threaded blind hole.

[0059] The tensioning anchor 6 has several holes, each hole holding and fixing a steel strand through an anchor clamp. All the steel strands 13 of the old parallel steel strand stay cable 1 are held in place by the anchor clamps through these holes.

[0060] The transition anchor is divided into two parts, which facilitates subsequent installation and disassembly.

[0061] Preferably, a circular plate is provided at the bottom of the tension rod 4, and the top ends of all steel strands 13 are close to the circular plate.

[0062] Specifically, the axes of tensioning column 5, tensioning anchor 6, threaded blind hole, groove of support platform 10, tensioning rod 4, limit nut 8 and adjusting nut 9 are all coaxial.

[0063] In one embodiment, both the tensioning column 5 and the tensioning anchor 6 are 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 1. The outer diameters of both the tensioning column 5 and the anchor head 12 are smaller than the inner diameter of the reserved hole in the anchor plate 14, so that after the anchoring nut 15 is removed, both the tensioning column 5 and the anchor head 12 can pass through the inner diameter of the reserved hole in the anchor plate 14 and be lowered.

[0064] This application also discloses a quick-release method based on the above-mentioned quick-release device, comprising the following steps: The easing device 100 is installed at the top of the old parallel steel strand stay cable 1 and transfers and anchors all the steel strands 13. Specifically, all the steel strands 13 were originally anchored to the anchor head 12. The easing device 100 further transfers and anchors all the steel strands 13 extending from the anchor head 12 again to facilitate external pulling.

[0065] The loosening device 100 pulls the steel strand 13 outward until the anchor plate 14 and anchor nut 15 are disengaged. The anchor nut 15 is then removed, thus adjusting the end structure of the old parallel steel strand stay cable 1 from tight to loose. The loosening device 100 lowers the anchor head 12 until the parallel steel strand stay cable 1 reaches a stress-free state, that is, the parallel steel strand stay cable 1 changes from a taut state to a relaxed state.

[0066] The HDPE outer sleeve 11 wrapped around the parallel steel strand cable 1 is removed, and two double semi-circular fastening devices 2 are installed at the top of the cable guide tube at the beam end base and the bottom of the cable guide tube at the tower end base, respectively. The double semi-circular fastening devices 2 tighten the entire bundle of steel strands 13, which is convenient for subsequent cutting and lowering.

[0067] The reaction tensioning device connects to and tensions the double semi-circular fastening device 2 adjacent to the beam end base via steel wire rope, providing tension force to cut the steel strand 13 at the beam end base. At this time, the bottom end of the cut steel strand 13 remains stationary. The lifting hanger device connects to and tensions the double semi-circular fastening device 2 adjacent to the tower end base via steel wire rope, providing tension force to cut the steel strand 13 at the tower end base. At this time, the top end of the cut steel strand 13 remains stationary. Afterwards, the reaction tensioning device and the lifting hanger device work together to lower the old parallel steel strand cable 1.

[0068] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0069] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0070] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A quick-release device for an old parallel steel strand stay cable, wherein the top end of the old parallel steel strand stay cable is provided with an anchor head (12), an anchor plate (14), and an anchor nut (15), characterized in that, The quick-release device includes: The loosening device (100) is set at the top of the old parallel steel strand cable (1) for transferring all the steel strands (13) of the old parallel steel strand cable (1) to anchor, for assisting in loosening the anchor nut (15), and for lowering the anchor head (12) until the old parallel steel strand cable (1) reaches a stress-free state. Two double semi-circular fastening devices (2) are fastened to the top end of the cable guide tube of the beam end base and the bottom end of the cable guide tube of the tower end base of the old parallel steel strand cable (1), respectively. The reaction tensioning device is connected to the double semi-circular fastening device (2) of the adjacent beam end base by steel wire rope. The tensioning device is lifted and connected to the double semi-circular fastening device (2) near the tower end base via a steel wire rope. When the two ends of the old parallel steel strand cable (1) in a stress-free state are cut, the reaction tensioning device and the lifting tensioning device cooperate to lower the old parallel steel strand cable (1).

2. The quick-release device for a used parallel steel strand cable stay as described in claim 1, characterized in that: Each of the double semicircular fastening devices (2) is provided with a lifting hole (24); the reaction tensioning device and the lifting tensioning device are both connected to the lifting hole (24) of the double semicircular fastening device (2) by steel wire rope.

3. The quick-release device for a used parallel steel strand cable stay as described in claim 2, characterized in that: The double semicircular fastening device (2) includes two semicircular hoops (21). Both sides of the semicircular hoops (21) are provided with connecting flanges. The connecting flanges of the two semicircular hoops (21) are fitted and aligned and connected and fixed by fastening bolts. The lifting hole (24) is provided on the connecting flange. The semicircular hoop (21) is provided with a number of fastening bolt holes (23) in the radial direction, and a long screw is inserted into each fastening bolt hole (23); the number of long screws are symmetrically arranged along the mating surfaces of the two semicircular hoops (21).

4. The quick-release device for a pre-existing parallel steel strand cable stay as described in claim 2, characterized in that: 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 coiled by the reaction winch (201) passes through the fixed pulley structure (202) and is connected to the hoisting hole (24) of the double semi-circular fastening device (2) near the beam end base.

5. The quick-release device for a used parallel steel strand cable stay as described in claim 2, characterized in that: The lifting and tensioning device includes a lifting winch (304) and a hanging pulley block (302). The lifting winch (304) is located on the top surface of the main beam body (400), and the hanging pulley block (302) is located on the top side of the bridge tower body (500) through an auxiliary structure. One end of the wire rope of the hoisting winch (304) passes through the hoisting pulley block (302) and is connected to the hoisting hole (24) of the double semi-circular fastening device (2) near the tower end base.

6. The quick-release device for a pre-existing parallel steel strand cable stay as described in claim 5, characterized in that: The lifting and tensioning device also includes a steering structure (303) and a lifting hanger (301), the lifting hanger (301) being disposed on the top surface of the bridge tower body (500), and part of the lifting hanger (301) extending outward; The hanging pulley block (302) is located at the extended end of the lifting frame (301). One end of the wire rope of the lifting winch (304) passes through the steering structure (303). The hanging pulley block (302) is connected to the lifting hole (24) of the double semi-circular fastening device (2) near the tower end base.

7. The quick-release device for a former parallel steel strand cable stay as described in claim 1, characterized in that, The release device (100) includes: The column support (7) includes a support platform (10) and several column bodies. The top of all column bodies is fixed to the support platform (10), and the bottom of all column bodies abuts against the anchor plate (14) at the end of the old parallel steel strand cable (1). A through-hole jack (3) is installed on the top surface of the support platform (10); The transition anchor is set in the space enclosed by several column bodies, and the transition anchor is connected to the steel strand (13) extending outward from the anchor head (12). Tension rod (4) passes through the through jack (3) and support platform (10), and the bottom end of tension rod (4) is connected to the transition anchor.

8. The quick-release device for a former parallel steel strand cable stay as described in claim 7, characterized in that, The support platform (10) is provided with a groove with the central opening facing upward, and the tension rod (4) passes through the groove; the release device (100) also includes a limiting nut (8) and an adjusting nut (9), the limiting nut (8) is fixedly set at the top of the tension rod (4), the adjusting nut (9) is located in the groove, and the adjusting nut (9) matches the tension rod (4). The through-hole jack (3) and adjusting nut (9) work together to lower the old parallel steel strand cable (1).

9. The quick-release device for a former parallel steel strand cable stay as described in claim 7, characterized in that, The transition anchor includes a tensioning column (5) and a tensioning anchor (6), wherein the tensioning column (5) has a downward-opening threaded blind hole, and the tensioning anchor (6) has threads that match the threaded blind hole; The tensioning anchor (6) has several holes, and each hole is secured by an anchor clamp to hold a steel strand.

10. The quick-release device for a used parallel steel strand cable stay as described in claim 9, characterized in that, 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 (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 plate (14).

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