A method for tensioning construction of a steel strand cable and a device thereof

Abstract

The application relates to a steel strand cable stay cable tensioning construction method and device, which comprises the following steps: picking up one bundle of steel strands of the cable stay cable, installing an open anchor on the steel strands, and sequentially installing a pulley block, wherein the pulley block comprises a movable pulley and a fixed pulley; tightening a steel wire rope at the outlet of the movable pulley, shortening the distance between the movable pulley and the fixed pulley, cutting off the steel strands between the movable pulley and the fixed pulley when the stress value of the steel strands between the movable pulley and the fixed pulley is zero; removing the cable force of the bundle of steel strands between the open anchor and a main tower until the stress value of the steel strands is zero, and the tensioning construction of the bundle of steel strands is completed, and the open anchor is removed; and the tensioning construction of the remaining steel strands is completed in the same way. In the application, after the open anchor is used to anchor the steel strands, the intermediate tensioning method is adopted, the movable pulley and the fixed pulley are used to cut off the cable force of each steel strand after tensioning, the cable force of the whole cable stay cable is tensioned and removed, and there is no risk of high-altitude operation during the tensioning of the cable stay cable.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a method and apparatus for tensioning steel strand cable stays. Background Technology

[0002] The stay cables are the load-bearing components of a cable-stayed bridge, transferring the weight of the main girder and bridge deck to the towers. Quality issues with the stay cables significantly increase the probability of accidents. Because the stay cables are slender and have lower stiffness compared to the beams and towers, they are susceptible to corrosion and long-term fatigue degradation, resulting in a design life less than half the design reference period of the main girder or towers. Furthermore, environmental factors and external damage further shorten the actual service life of the stay cables compared to their design life. Therefore, during the operation of a cable-stayed bridge, one, two, or more cable replacements are necessary.

[0003] Looking at the historical development of cable-stayed bridges in my country, most of the cables that need to be replaced in recent years are steel strand cables. The replacement of cables is the reverse process of installation. First, the cables need to be unloaded, that is, tensioned.

[0004] Existing technology generally uses tension threads at both ends to unload the stay cables and then gradually replace them, which results in low safety during the replacement of stay cables. Summary of the Invention

[0005] This application provides a method and apparatus for tensioning a steel strand cable-stayed bridge, which can solve the problem of low safety when using tools in related technologies to unload the cable-stayed bridge.

[0006] In a first aspect, embodiments of this application provide a method for tensioning a steel strand cable-stayed bridge, comprising:

[0007] One bundle of steel strands of the cable is lifted up, an open anchor is installed on the steel strand, and a pulley block is installed in sequence, the pulley block including a movable pulley and a fixed pulley;

[0008] Tighten the wire rope at the outlet of the movable pulley to shorten the distance between the movable pulley and the fixed pulley. When the stress value of the steel strand between the movable pulley and the fixed pulley is zero, cut the steel strand between the movable pulley and the fixed pulley.

[0009] The tension of the bundle of steel strands located between the open anchor and the main tower is released until the stress value of the steel strands at that point is zero. The tensioning of the bundle of steel strands is then completed, and the open anchor is removed.

[0010] By analogy, the remaining steel strands were tensioned and laid down.

[0011] In conjunction with the first aspect, in one embodiment, before lifting one bundle of steel strands of the stay cable, the method further includes:

[0012] Remove the outer sheath of the stay cable to expose the steel strands.

[0013] Secondly, this application provides a steel strand cable tensioning construction device, which includes: an open anchor for anchoring the steel strand;

[0014] A pulley block, wherein the open anchor is connected to the pulley block, the pulley block includes a movable pulley and a fixed pulley, a wire rope is provided between the movable pulley and the fixed pulley, and one end of the wire rope is connected to a winch;

[0015] A beam end connector, wherein the beam end connector is connected to a pulley block, and the pulley block is used to connect to a beam end anchor via the beam end connector;

[0016] A first wire rope tension meter and a second wire rope tension meter are used to collect the stress value of the steel strand between the moving pulley and the fixed pulley, and the second wire rope tension meter is used to collect the stress value of the steel strand between the open anchor and the main tower.

[0017] In conjunction with the second aspect, in one embodiment, the open anchor includes: two anchor bodies and two clamps, the two anchor bodies are detachably connected, and a through hole is formed between the two anchor bodies in use; a locking hole is formed between the two clamps in use, the locking hole is for steel strands to pass through, and the two clamps are inserted into the through hole.

[0018] In conjunction with the second aspect, in one embodiment, the anchor body is provided with mounting holes.

[0019] In conjunction with the second aspect, in one embodiment, the open anchor is connected to the pulley block via a shackle.

[0020] In conjunction with the second aspect, in one embodiment, the movable pulley is connected to the open anchor; the fixed pulley is connected to the beam end connector; a shackle is provided on one side of the movable pulley, and one end of the wire rope is connected to the shackle.

[0021] In conjunction with the second aspect, in one embodiment, a shackle is provided between the beam end connector and the pulley block.

[0022] In conjunction with the second aspect, in one embodiment, the beam end connector includes a sling, one end of which is connected to a shackle, and the other end is used to connect to a beam end anchor.

[0023] In conjunction with the second aspect, in one embodiment, the beam end connector includes a bolt for connection to a beam end anchor.

[0024] The beneficial effects of the technical solutions provided in this application include:

[0025] This application provides a method and apparatus for releasing tension on a steel strand cable-stayed bridge. After anchoring the steel strands with open anchorages, a middle-release method is used, employing movable and fixed pulleys to release tension on each steel strand one by one before cutting, thus achieving tension release and dismantling of the entire cable-stayed bridge. This method can be carried out at any position near the beam end in the middle section of the steel strands. Compared with the traditional method of releasing tension inside the main tower, it is not limited by operating space, has no high-altitude operation risks, requires less labor intensity for personnel, and is highly safe. The use of a winch for tension release allows for more stable control of the cable transitioning to a stress-free state, better control of stress release impact, and reduced safety risks to operators and the bridge structure. The steel strand cable-stayed bridge tension release apparatus is simple to install, and repetitive operations save time. After the tension release of one bundle of steel strands is completed, simply clamp the open anchorage to the steel strand to be released, and a new round of tension release operations can begin, resulting in rapid construction progress. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the overall structure and beam end anchorage provided in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of an open anchor provided in an embodiment of this application.

[0030] In the diagram: 1. Open anchor; 11. Wedge; 12. Mounting hole; 13. Anchor body; 2. Moving pulley; 3. Fixed pulley; 4. Shackle; 5. Lifting strap; 6. Beam end anchor; 7. Winch; 8. Wire rope; 9. First wire rope tension meter; 10. Second wire rope tension meter. Detailed Implementation

[0031] 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.

[0032] This application provides a method and apparatus for tensioning a steel strand cable-stayed bridge, which can solve the problem of low safety when using tools in related technologies to unload cables.

[0033] In a first aspect, embodiments of this application provide a method for tensioning a steel strand cable-stayed bridge, comprising:

[0034] 101: Pick up one strand of the cable-stayed cable, install an open anchor 1 on the strand, and install a pulley block in sequence, the pulley block including a movable pulley 2 and a fixed pulley 3;

[0035] 102: Tighten the wire rope 8 at the outlet of the movable pulley 2 to shorten the distance between the movable pulley 2 and the fixed pulley 3. When the stress value of the steel strand between the movable pulley 2 and the fixed pulley 3 is zero, cut the steel strand between the movable pulley 2 and the fixed pulley 3.

[0036] 103: Release the tension of the bundle of steel strands located between the open anchor 1 and the main tower until the stress value of the steel strands at that point is zero. The tensioning of the bundle of steel strands is then completed, and the open anchor 1 is removed.

[0037] 104: Continue in this manner to complete the tensioning of the remaining steel strands.

[0038] In this application, after anchoring the steel strands with the open anchor 1, the tension is released in the middle. The moving pulley 2 and the fixed pulley 3 are used to release the tension of each steel strand one by one and then cut them, so as to realize the tension release and dismantling of the entire cable. It can be carried out at any position near the beam end in the middle section of the steel strand. Compared with the traditional tension release construction method inside the main tower, it is not limited by the operating space, has no high-altitude operation risk, low personnel workload, and high safety. The use of winch 7 for tension release can more stably control the cable to a stress-free state, better control the stress release impact force, and reduce the safety risks to operators and bridge structure. The installation of the steel strand cable tension release construction device is simple, and the repetitive operation saves more time. After the tension of one bundle of steel strands is completed, the open anchor 1 is simply clamped to the steel strand to be released, and a new round of tension release operation can be started, resulting in fast construction progress.

[0039] During the tensioning of the steel strand, a tensioning device for the inclined cable of the steel strand is required. This device includes an open anchor 1 and a pulley block. The open anchor 1 is used to anchor the steel strand; the pulley block includes a movable pulley 2 and a fixed pulley 3. The movable pulley 2 is connected to the open anchor 1 via a shackle 4, and the movable pulley 2 and the fixed pulley 3 are connected to the shackle 4 via a wire rope 8. The wire rope 8 is pulled out from the outlet of the movable pulley 2 and connected to a winch 7.

[0040] In addition, the steel strand cable tensioning construction device also includes a beam end connector, and the beam end connector is connected to the fixed pulley 3 in the pulley block so that the pulley block is connected to the beam end anchor 6 through the beam end connector, thereby realizing the positioning of the fixed pulley 3.

[0041] Based on the above embodiments, in this embodiment, before lifting one bundle of steel strands of the stay cable, the method further includes:

[0042] 100: Remove the outer sheath of the stay cable to expose the steel strands.

[0043] Specifically, the PE sheath of the cable to be constructed is cut off to expose the steel strands inside.

[0044] Then proceed to step 101: lift up one strand of the cable-stayed cable, install an open anchor 1 on the strand, and install a pulley block in sequence, the pulley block including a movable pulley 2 and a fixed pulley 3.

[0045] Specifically, each strand of steel wire is tightly arranged together. Tools are needed to lift one bundle of steel wire and hoist it to a certain height to separate it from the other strands. At this time, open anchor 1 is installed. Since traditional anchors are mostly closed type and insert the steel wire from the end face, in this embodiment, a special open anchor 1 is set to meet the side installation. With the use of clamps, the steel wire is clamped and anchored, so that the anchor point does not slip when stretched.

[0046] The open anchor 1 includes two anchor bodies 13 and two clamping plates 11. The two anchor bodies 13 are detachably connected. When in use, a through hole is formed between the two anchor bodies 13. When in use, a locking hole is formed between the two clamping plates 11. The locking hole is for steel strands to pass through, and the two clamping plates 11 are inserted into the through hole.

[0047] Specifically, such as Figure 3 As shown, both anchor bodies 13 have grooves. After the two anchor bodies 13 are aligned, the two grooves form a through hole. The two anchor bodies 13 are separated so that the steel strand is placed in the groove, and then the two anchor bodies 13 are fixed with bolts. At this point, the steel strand is located in the through hole. In this embodiment, the diameter of the through hole is larger than the diameter of the steel strand. Therefore, the two anchor bodies can be adjusted to any position on the steel strand as needed, and then, with the clamping piece 11, the steel strand can be clamped and anchored, preventing slippage at the anchor point during tension.

[0048] After the two clamping pieces 11 are aligned, a locking hole is formed between them. The diameter of the locking hole is less than or equal to the diameter of the steel strand, and the two clamping pieces 11 form a cylindrical structure whose diameter is adapted to the diameter of the through hole. Therefore, after the two clamping pieces 11 lock the steel strand, they are inserted into the through hole, which limits the two anchor bodies 13 and prevents them from continuing to slip on the steel strand.

[0049] Furthermore, the diameters at both ends of the through hole are different, so the cylindrical structure formed after the two clamping pieces 11 are aligned is set as a conical hole. When the two clamping pieces 11 are aligned and inserted into the through hole, the two clamping pieces 11 and the two anchor bodies 13 are locked together by the through hole structure with different diameters.

[0050] The sequential installation of the pulley block here refers to connecting the movable pulley 2 to the open anchor 1 via shackle 4. The anchor body 13 has an installation hole, through which the shackle 4 connects the movable pulley 2 to the open anchor 1. The movable pulley 2 needs to be kept suspended and parallel to the cable using a hand-operated hoist or crane. The movable pulley 2 and the fixed pulley 3 are connected via wire rope 8 and shackle 4. The wire rope 8 is pulled out from the movable pulley 2 and connected to the winch 7.

[0051] The beam end connector includes a sling 5, one end of which is connected to a shackle 4, and the other end is used to connect to the beam end anchor 6. Specifically, the lifting ring of the fixed pulley 3 connects to two slings 5 ​​via the shackle 4, and the fixed pulley 3 is connected to the flange face of the beam end anchor 6 via the shackle 4 and the sling 5. Figure 2 The second wire rope tension meter 10 and the first wire rope tension meter 9 are installed at appropriate positions on sections A and B of the steel strand, thus completing the installation of the steel strand cable tensioning construction device.

[0052] Next, proceed to step 102: tighten the wire rope 8 at the outlet of the movable pulley 2 to shorten the distance between the movable pulley 2 and the fixed pulley 3. When the stress value of the steel strand between the movable pulley 2 and the fixed pulley 3 is zero, cut the steel strand between the movable pulley 2 and the fixed pulley 3.

[0053] Specifically, since the wire rope 8 extending from the movable pulley 2 is connected to the winch 7, the working speed of the winch 7 is controlled to slowly tighten the wire rope 8. At this time, the movable pulley 2 slowly drives the open anchor 1 to move towards the fixed pulley 3, so that the A section of steel strand is tightened and the B section of steel strand is relaxed, so as to slowly release the internal stress of the B section of steel strand. The tension value of the B section of steel strand is monitored in real time by reading the first wire rope tension meter 9. When the internal stress of the B section of steel strand drops to zero, the B section of steel strand is cut with a cutting tool.

[0054] Then proceed to step 103: release the tension of the bundle of steel strands located between the open anchor 1 and the main tower until the stress value of the steel strands at that point is zero. The tensioning of the bundle of steel strands is then completed, and the open anchor 1 is removed.

[0055] Specifically, the winch 7 is then adjusted to rotate slowly in the opposite direction to release the internal stress of the A section of steel strand. The tension value of the A section of steel strand is monitored in real time by reading the second wire rope tension meter 10. When the internal stress of the A section of steel strand drops to zero, the open anchor 1 is removed, thus completing the tensioning construction of this bundle of steel strand.

[0056] Next, proceed to step 104: and so on, to complete the tensioning of the remaining steel strands.

[0057] Specifically, repeat the above steps to gradually complete the tensioning of the remaining steel strands.

[0058] Therefore, this method can be used at any position near the beam end in the middle section of the steel strand. Compared with the traditional method of tensioning inside the main tower, it is not limited by operating space, has no risk of working at height, and requires less labor intensity. At the same time, this method is simple to install, and repetitive operations save time. After the tensioning of one bundle of steel strands is completed, simply clamp the open anchor 1 with the steel strand to be tensioned, and then connect the open anchor 1 to the pulley block through the shackle 4 to start a new round of tensioning operations, which is fast. Compared with other intermediate tensioning methods, the construction equipment structure of this invention is simple and the components used are... With fewer and mostly standard components, the use of a winch 7 for tension release allows for more stable control of the cable transitioning to a stress-free state, better control of stress release impact, and reduced safety risks to operators and the bridge structure. Meanwhile, other tension release methods on the market rely heavily on visual observation of the strand's deformation to determine if the internal stress of the steel strand has been completely unloaded, which is inefficient and prone to safety risks due to incomplete unloading. This invention introduces a first wire rope tension meter 9 and a second wire rope tension meter 10 during operation, enabling better real-time monitoring of the tension release process.

[0059] Secondly, this application provides a steel strand cable tensioning construction device, which includes: an open anchor 1, a pulley block, and a beam end connector. The open anchor 1 is used to anchor the steel strand. The open anchor 1 is connected to the pulley block, which includes a movable pulley 2 and a fixed pulley 3, and a steel wire rope 8 is arranged between the movable pulley 2 and the fixed pulley 3. The beam end connector is connected to the pulley block, and the pulley block is used to connect to the beam end anchor 6 through the beam end connector. A first steel wire rope tension meter 9 and a second steel wire rope tension meter 10 are provided. The first steel wire rope tension meter 9 is used to collect the stress value of the steel strand between the movable pulley 2 and the fixed pulley 3, and the second steel wire rope tension meter 10 is used to collect the stress value of the steel strand between the open anchor 1 and the main tower.

[0060] The open anchor 1 is used to anchor the steel strand. The pulley block includes a movable pulley 2 and a fixed pulley 3. The movable pulley 2 is connected to the open anchor 1 via a shackle 4. The movable pulley 2 and the fixed pulley 3 are connected via a wire rope 8 and a shackle 4. A shackle 4 is provided on one side of the movable pulley 2. One end of the wire rope 8 is connected to the shackle 4, and the other end of the wire rope 8 is pulled out from the outlet of the movable pulley 2 and connected to the winch 7. The open anchor 1 includes two anchor bodies 13 and two clamps 11. The two anchor bodies 13 are detachably connected. In use, a through hole is formed between the two anchor bodies 13. In use, a locking hole is formed between the two clamps 11. The locking hole allows the steel strand to pass through, and the two clamps 11 are inserted into the through hole. After the two clamping plates 11 lock the steel strand, they are inserted into the through hole. At this time, the two anchor bodies 13 can be limited so that the two anchor bodies 13 will not continue to slide on the steel strand, thereby achieving clamping and anchoring of the steel strand and preventing the anchor point from slipping when stretched.

[0061] The anchor body 13 has an installation hole, and the shackle 4 passes through the installation hole to connect the movable pulley 2 to the open anchor 1.

[0062] In addition, the steel strand cable tensioning construction device also includes a beam end connector, and the beam end connector is connected to the fixed pulley 3 in the pulley block so that the fixed pulley 3 in the pulley block is connected to the beam end anchor 6 through the beam end connector, thereby realizing the positioning of the fixed pulley 3.

[0063] A shackle 4 is provided between the beam end connector and the pulley block. The beam end connector includes a lifting strap 5, one end of which is connected to the shackle 4, and the other end is used to connect to the beam end anchor 6. The fixed pulley 3 is connected to the beam end connector; that is, the lifting ring of the fixed pulley 3 is connected to two lifting straps 5 via the shackle 4. The fixed pulley 3 is connected to the flange surface of the beam end anchor 6 via the shackle 4 and the lifting straps 5. Figure 2 The second wire rope tension meter 10 and the first wire rope tension meter 9 are installed at appropriate positions on sections A and B of the steel strand, thus completing the installation of the steel strand cable tensioning construction device.

[0064] In addition, the beam end connector may also include bolts for connecting to the beam end anchor 6. That is, one end of the bolt is connected to the fixed pulley 3, and the other end is connected to the flange face of the fixed pulley 3.

[0065] During construction, the PE sheath of the cable to be constructed is removed to expose the steel strands inside. Since each steel strand is tightly packed together, a tool is used to lift one bundle of steel strands and hoist it to a certain height to separate it from the other steel strands. At this point, an open anchor 1 is installed. Because traditional anchors are mostly closed-type and insert the steel strand from the end face, in this embodiment, a dedicated open anchor 1 is set to meet the requirements of side installation. With the use of clamps, the steel strands are clamped and anchored, so that the anchor point does not slip during tension.

[0066] Since the wire rope 8 extending from the movable pulley 2 is connected to the winch 7, the working speed of the winch 7 is controlled to slowly tighten the wire rope 8. At this time, the movable pulley 2 slowly drives the open anchor 1 to move towards the fixed pulley 3, so that the A section of steel strand is tightened and the B section of steel strand is relaxed, so as to slowly release the internal stress of the B section of steel strand. The tension value of the B section of steel strand is monitored in real time by reading the first wire rope tension meter 9. When the internal stress of the B section of steel strand drops to zero, the B section of steel strand is cut with a cutting tool.

[0067] Then adjust the winch 7 to rotate slowly in the opposite direction to release the internal stress of the A section of steel strand. Monitor the tension value of the A section of steel strand in real time by reading the second wire rope tension meter 10. When the internal stress of the A section of steel strand drops to zero, remove the open anchor 1. This completes the tensioning construction of this bundle of steel strand.

[0068] Finally, repeat the above steps to gradually complete the tensioning of the remaining steel strands.

[0069] 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.

[0070] 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.

[0071] 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 method of tensioning a steel strand cable, characterized in that, It includes: Provided is a steel strand cable stay construction device, which comprises an open anchor (1), a pulley block, a beam end connector, a first steel wire rope tension gauge (9) and a second steel wire rope tension gauge (10), the open anchor (1) is used for anchoring a steel strand; the open anchor (1) is connected with the pulley block, the pulley block comprises a movable pulley (2) and a fixed pulley (3), a steel wire rope (8) is arranged between the movable pulley (2) and the fixed pulley (3), and one end of the steel wire rope (8) is connected with a winch (7); the beam end connector is connected with the pulley block, and the pulley block is used for connecting with a beam end anchor (6) through the beam end connector; the first steel wire rope tension gauge (9) is used for collecting a steel strand stress value between the movable pulley and the fixed pulley, and the second steel wire rope tension gauge (10) is used for collecting a steel strand stress value between the open anchor and a main tower; One of the steel strands of the cable stay is lifted, and the open anchor (1) is installed on the steel strand, wherein the open anchor (1) comprises two anchor bodies (13) and two clamping pieces (11), the two anchor bodies (13) are detachably connected, and a through hole is formed between the two anchor bodies (13) during use; a locking hole is formed between the two clamping pieces (11) during use, the locking hole is used for passing the steel strand, the two clamping pieces (11) are inserted into the through hole, and a pulley block is sequentially installed, the pulley block comprises a movable pulley (2) and a fixed pulley (3); the movable pulley (2) is connected with the open anchor (1); the fixed pulley (3) is connected with a beam end connector; one side of the movable pulley (2) is provided with a shackle (4), and one end of the steel wire rope (8) is connected with the shackle (4); the pulley block is sequentially installed as follows: the movable pulley (2) is connected with the open anchor (1) through the shackle (4), wherein an installation hole is formed in the anchor body (13), the shackle (4) passes through the installation hole to connect the movable pulley (2) with the open anchor (1), and the movable pulley (2) is kept in suspension and parallel to the cable stay by using a hand-operated hoist or a crane; the movable pulley (2) and the fixed pulley (3) are connected through the steel wire rope (8) and the shackle (4), and the steel wire rope (8) is pulled out from the movable pulley (2) to connect the winch (7); The steel wire rope (8) at the outlet of the movable pulley (2) is tightened, the distance between the movable pulley (2) and the fixed pulley (3) is shortened, and when the steel strand stress value between the movable pulley (2) and the fixed pulley (3) is zero, the steel strand between the movable pulley (2) and the fixed pulley (3) is cut, wherein the steel wire rope (8) passing out of the movable pulley (2) is connected with the winch (7), and the method specifically comprises the following steps: the speed of the winch (7) is controlled to tighten the steel wire rope (8); the movable pulley (2) drives the open anchor (1) to move towards the fixed pulley (3), so that the A section steel strand is tightened and the B section steel strand is loosened, so as to release the internal stress of the B section steel strand; the B section steel strand tension value is monitored in real time through the first steel wire rope tension gauge (9), and when the internal stress of the B section steel strand is reduced to zero, the B section steel strand is cut by using a cutting tool at this time; When the cable force of the bundle of steel strands between the open anchor (1) and the main tower is removed until the steel strand stress value at the location is zero, the bundle of steel strands is tensioned and the open anchor (1) is removed; By analogy, the tensioning construction of the remaining steel strands is completed.

2. The steel strand stay cable tensioning construction method according to claim 1, characterized in that, Before picking up one bundle of steel strands of the cable, the method further comprises: The outer sheath of the cable is stripped to expose the steel strands.

3. The steel strand cable tensioning construction method of claim 1, wherein: The anchor body (13) is provided with a mounting hole.

4. The steel strand cable tensioning construction method of claim 1, wherein: The open anchor (1) and the pulley block are connected through a shackle (4).

5. The steel strand cable tensioning construction method of claim 1, wherein: The beam end connector and the pulley block are provided with a shackle (4).

6. The steel strand cable tensioning construction method of claim 5, wherein: The beam end connector comprises a sling (5), one end of the sling (5) is connected with the shackle (4), and the other end is used for connecting with the beam end anchor (6).

7. The steel strand cable tensioning construction method of claim 1, wherein: The beam end connector comprises a bolt, and the bolt is used for connecting with the beam end anchor (6).

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