A tensioning device for prestressed anchors

Abstract

The present invention discloses a tensioning device for prestressed anchors in the technical field of prestressed anchors, including a bridge body, and a plurality of tensioning holes are provided on the surface of the bridge body; during the construction of a prestressed bridge in the present invention, it is necessary to pull the tensioning tendons inside the bridge body. During the installation of the installation cylinder, the support plate is used to make the installation cylinder in a horizontal state. The second pressing block and the second limiting buckle move to the same position as the pulling tendon, so that the tensioning degrees of a plurality of tensioning tendons are the same. Moreover, the blocking block is used to block the first limiting buckle to prevent the first limiting buckle from being driven a long distance by the tensioning tendon. And when the sliding cylinder gradually moves to the side of the installation cylinder away from the bridge body, the first limiting buckle is pushed into the first limiting hole by the pulling rod, the sliding ring and the pushing rod, so that when the sliding cylinder moves to the end of the installation cylinder, the first limiting buckle can be in the first limiting hole to timely limit the tensioning tendon.

Description

Technical Field

[0001] The present invention relates to the technical field of prestressed anchors, and specifically relates to a tensioning device for prestressed anchors. Background Art

[0002] Prestress is the compressive stress pre-applied to a structure during construction to improve its service performance. During the service period of the structure, the pre-compressive stress can completely or partially offset the tensile stress caused by the load, avoiding structural failure, and is commonly used in concrete structures; a prestressed concrete structure is a structure to which pressure is pre-applied before it bears the load, so that compressive stress is generated in the tensile zone concrete when it is under the action of the external load, to offset or reduce the tensile stress generated by the external load.

[0003] A prestressed anchor is an anchor used for tensioning concrete prestress during the construction of a project, and is generally often used in bridge construction. It is pre-installed and positioned, and then concrete is poured and buried at both ends of the concrete, that is, at the two ends of the corrugated pipe. It is an end face provided for the stable action of the jack during tensioning. After applying pre-compressive stress to the steel strand of the prestressed anchor, it can improve the stiffness of the component, delay the time of crack appearance, and increase the durability of the component.

[0004] In the prior art during the construction of a prestressed bridge, it is necessary to tighten the prestressed tendons inside the bridge. When using a tensioning device to tighten the prestressed tendons, it is necessary to use a limiting member to limit the prestressed tendons. After pulling the prestressed tendons out of the bridge, it is necessary to loosen and repeat pulling the prestressed tendons. The loosened prestressed tendons will be limited by the limiting member, but the limiting member will move outward to the outside of the bridge when the prestressed tendons are pulled out. Subsequently, when the prestressed tendons are loosened, the prestressed tendons will drive the limiting member to move towards the side close to the bridge. The limiting member cannot limit the prestressed tendons in time, easily causing the prestressed tendons to rebound, and the limiting member cannot limit multiple prestressed tendons at the same time, resulting in different tensioning degrees of multiple prestressed tendons, thus affecting the quality of the bridge. Summary of the Invention

[0005] The purpose of the present invention is to provide a tensioning device for prestressed anchors to solve the problems raised in the above background art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A tensioning device for a prestressed anchor comprises a bridge body, a plurality of tensioning holes are opened on the surface of the bridge body, the inner sides of the ends of the tensioning holes are inclined, a plurality of tensioning bars are arranged in the tensioning holes, a limiting mechanism is arranged at the ends of the tensioning holes, the limiting mechanism is used to limit and fix the tensioning bars, a blocking mechanism is arranged on the surface of the limiting mechanism, the blocking mechanism is used to block the limiting mechanism, a tensioning mechanism is arranged on the surface of the tensioning bars, the tensioning mechanism is used to tighten the tensioning bars, the limiting mechanism will release the limit on the tensioning bars when the tensioning mechanism pulls the tensioning bars, a pushing mechanism is arranged on the tensioning mechanism, the pushing mechanism is used to push the limiting mechanism to the side close to the tensioning hole in time to limit the tensioning bars when the tensioning mechanism pulls the tensioning bars to the longest at a single time, a supporting mechanism is arranged at the bottom of the tensioning mechanism, the supporting mechanism is used to support the tensioning mechanism when the tensioning mechanism is installed on the surface of the tensioning bars, so that the tensioning mechanism remains stable.

[0007] As a further solution of the present invention, the limiting mechanism includes a stabilizing cylinder, which is fixedly installed in the tensioning hole, and the tensioning rod passes through the stabilizing cylinder. A first pressure block is sleeved on the surface of the tensioning rod, and a plurality of first limiting holes are opened on the surface of the first pressure block. The plurality of tensioning rods all pass through the plurality of first limiting holes, and a first limiting buckle is arranged in the plurality of first limiting holes. The side surface of the first limiting buckle is an inclined surface, and the first limiting buckle will move into the first limiting hole under the action of the tensioning rod to limit the tensioning rod.

[0008] As a further solution of the present invention, the blocking mechanism includes a blocking block, which is in contact with the surface of the first pressure block. A clearance groove is provided on the surface of the blocking block close to the first pressure block, the tensioning rod passes through the blocking block, and the end of the first limit buckle is located in the clearance groove.

[0009] As a further scheme of the present invention, the tensioning mechanism includes a mounting cylinder, which is sleeved on the surface of the tensioning bar, and the surface of the mounting cylinder is connected to two oil pipes. A fixed block is fixedly connected to the inside of the mounting cylinder, and the fixed block is located on the side close to the blocking block. The tensioning bar passes through the fixed block, and the fixed block is fitted with the blocking block. A fixed cylinder is fixedly connected to the surface of the fixed block close to the mounting cylinder. A sliding cylinder is slidingly sealed inside the mounting cylinder, and the sliding cylinder is slidably connected to the surface of the fixed cylinder. The sliding cylinder divides the inside of the mounting cylinder into two closed chambers, and the two oil pipes are respectively connected to the two closed chambers. A second pressure block is fixedly connected to the inside of the sliding cylinder, and a plurality of second limiting holes are opened on the surface of the second pressure block, and a plurality of tensioning bars pass through the plurality of second limiting holes respectively, and a second limiting buckle is provided inside the second limiting hole.

[0010] As a further aspect of the present invention, the pushing mechanism includes a plurality of sliding grooves, all of the plurality of sliding grooves are formed on the surface of the blocking block, the plurality of sliding grooves are arranged at equal angles, a pushing rod is hinged in the sliding groove, the middle position of the pushing rod is hinged in the sliding groove, the plurality of pushing rods respectively correspond to the positions of the plurality of first limit buckles, the pushing rod is telescopic, a sliding ring is slidably connected to the surface of the blocking block, the sliding ring is located at the position of the sliding groove, the end of the pushing rod is hinged to the inner side of the sliding ring, a U-shaped pulling rod is slidably connected to the surface of the mounting cylinder, the pulling rod extends to the side of the sliding ring away from the mounting cylinder, and the side of the pulling rod away from the blocking block extends to the left side of the second pressing block.

[0011] As a further aspect of the present invention, the supporting mechanism includes a support plate, and the support plate is elastically slidably connected to the surface of the mounting cylinder.

[0012] As a further aspect of the present invention, a fixing rod is fixedly connected to the surface of the second pressing block, a baffle is elastically slidably connected to the surface of the fixing rod, a plurality of through holes are formed in the surface of the baffle, the through holes are located on one side of the second limit buckle, and the plurality of tensioning tendons pass through the plurality of through holes.

[0013] As a further aspect of the present invention, a plurality of pulling plates are elastically hinged to the inner surface of the baffle away from the surface, and the ends of the pulling plates are attached to the surface of the tensioning tendons.

[0014] As a further aspect of the present invention, a plurality of ejecting rods are fixedly connected to the surface of the second limit buckle close to one side of the pulling plate, the ejecting rods are located on the right side of the pulling plate, so as to push the pulling plate away from the tensioning tendon when the baffle moves.

[0015] As a further aspect of the present invention, a plurality of friction strips are fixedly connected to the end of the pulling plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In the process of constructing a prestressed bridge according to the present invention, it is necessary to pull the tensioning bars inside the bridge body. In the process of installing the installation tube, the support plate is used to make the installation tube in a horizontal state, and the second pressing block and the second limiting buckle are moved to the same position as the pulling bar, thereby ensuring that the subsequent second pressing block and multiple second limiting buckles can pull the tensioning bars at the same time, so that the tensioning degrees of multiple tensioning bars are the same, and the blocking block is used to block the first limiting buckle to prevent the first limiting buckle from being driven by the tensioning bar for a long distance, thereby causing the tensioning bar to be loosened. When the sliding cylinder moves to the side of the installation cylinder away from the bridge body, it will move back more, reducing the tensioning effect, and when the sliding cylinder gradually moves to the side of the installation cylinder away from the bridge body, the pulling rod, the sliding ring and the pushing rod are used to push the first limit buckle into the first limit hole, so that when the sliding cylinder moves to the rear end of the installation cylinder, the first limit buckle can be in the first limit hole to limit the tensioning bar in time, avoiding that when the sliding cylinder moves to tighten the tensioning bar and then releases it, the first limit buckle cannot limit the tensioning bar in time, thereby causing the tensioning bar to move back and affect the tensioning effect.

[0018] The second limit buckle is moved to the second limit hole to limit the tensioning bar, and the second limit buckle is moved to the second limit hole to limit the tensioning bar.

[0019] After the installation cylinder and the sliding cylinder are sleeved on the surface of the tensioning bar, the tensioning bar will pass through the baffle plate, and then the baffle plate will be pushed toward the side close to the installation cylinder, and the baffle plate will drive the pulling plate to move together. Then, when the baffle plate moves toward the side away from the installation cylinder, the pulling plate will drive the tensioning bar to move together, so that multiple tensioning bars can be straightened before the sliding cylinder pulls the tensioning bars, ensuring that the subsequent movement of the sliding cylinder, the second limit buckle and the second pressure block can keep pulling multiple tensioning bars at the same time, thereby achieving the pulling effect of multiple tensioning bars and improving the strength of the bridge body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure of the present invention after being cut apart;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle;

[0023] Figure 4 It is a structural schematic diagram of the tensioning mechanism in the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the tensioning mechanism of the present invention after being cut open;

[0025] Figure 6 It is a structural schematic diagram of the connection relationship between the first pressing block and the first limiting buckle in the present invention;

[0026] Figure 7 It is a schematic structural diagram of the first limiting buckle in the present invention;

[0027] Figure 8 It is a structural schematic diagram of the connection relationship between the blocking block, the sliding ring, the pushing rod and the pulling rod in the present invention;

[0028] Figure 9 It is a schematic diagram of the structure of the sliding ring and the push rod in the present invention;

[0029] Figure 10 It is a structural schematic diagram of the connection relationship between the second pressing block and the second limiting buckle in the present invention;

[0030] Figure 11 It is a structural schematic diagram of the connection relationship between the baffle and the fixing rod in the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1-bridge body, 2-tensioning hole, 3-tensioning reinforcement, 4-stabilizing cylinder, 5-first pressure block, 6-first limiting hole, 7-first limiting buckle, 8-blocking block, 9-allowing groove, 10-installing cylinder, 11-oil pipe, 12-fixing block, 13-fixing cylinder, 14-sliding cylinder, 15-second pressure block, 16-second limiting hole, 17-second limiting buckle, 18-sliding groove, 19-pushing rod, 20-sliding ring, 21-pulling rod, 22-support plate, 23-fixing rod, 24-baffle, 25-through port, 26-pulling plate, 27-pushing rod, 28-friction strip. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0034] See also Figures 1-11, the present invention provides a technical solution: a tensioning device for prestressed anchors, including a bridge body 1. A plurality of tensioning holes 2 are provided on the surface of the bridge body 1. The inner side of the end of the tensioning hole 2 is an inclined surface. A plurality of tensioning tendons 3 are arranged in the tensioning hole 2. A limiting mechanism is provided at the end of the tensioning hole 2, and the limiting mechanism is used to limit and fix the tensioning tendon 3. A blocking mechanism is arranged on the surface of the limiting mechanism, and the blocking mechanism is used to block the limiting mechanism. A tensioning mechanism is arranged on the surface of the tensioning tendon 3, and the tensioning mechanism is used to tighten the tensioning tendon 3. The limiting mechanism will release the limit on the tensioning tendon 3 when the tensioning mechanism pulls the tensioning tendon 3. A pushing mechanism is arranged on the tensioning mechanism, and the pushing mechanism is used to push the limiting mechanism toward the side close to the tensioning hole 2 to limit the tensioning tendon 3 when the tensioning mechanism pulls the tensioning tendon 3 to a preset position (the preset position refers to the optimal installation position of the tensioning tendon 3 obtained through calculation before the construction of the prestressed anchor). A supporting mechanism is arranged at the bottom of the tensioning mechanism, and the supporting mechanism is used to support the tensioning mechanism when the tensioning mechanism is installed on the surface of the tensioning tendon 3 to keep the tensioning mechanism stable;

[0035] The limiting mechanism includes a stabilizing cylinder 4. The stabilizing cylinder 4 is fixedly installed in the tensioning hole 2. The tensioning tendon 3 passes through the stabilizing cylinder 4. A first pressing block 5 is sleeved on the surface of the tensioning tendon 3. A plurality of first limiting holes 6 are provided on the surface of the first pressing block 5. A plurality of tensioning tendons 3 all pass through the plurality of first limiting holes 6. A first limiting buckle 7 is arranged in each of the plurality of first limiting holes 6. The side surface of the first limiting buckle 7 is an inclined surface, and the first limiting buckle 7 will move into the first limiting hole 6 under the action of the tensioning tendon 3 to limit the tensioning tendon 3;

[0036] The blocking mechanism includes a blocking block 8. The blocking block 8 is attached to the surface of the first pressing block 5. A relief groove 9 is provided on the surface of the blocking block 8 close to the first pressing block 5. The tensioning tendon 3 passes through the blocking block 8, and the end of the first limiting buckle 7 is located in the relief groove 9;

[0037] The tensioning mechanism includes an installation cylinder 10. The installation cylinder 10 is sleeved on the surface of the tensioning tendon 3. Two oil pipes 11 are communicated with the surface of the installation cylinder 10. A fixing block 12 is fixedly connected inside the installation cylinder 10. The fixing block 12 is located on the side close to the blocking block 8. The tensioning tendon 3 passes through the fixing block 12. The fixing block 12 is attached to the blocking block 8. A fixing cylinder 13 is fixedly connected to the surface of the fixing block 12 close to the installation cylinder 10. A sliding cylinder 14 is slidably sealed inside the installation cylinder 10. The sliding cylinder 14 is slidably connected to the surface of the fixing cylinder 13. The sliding cylinder 14 divides the inside of the installation cylinder 10 into two sealed cavities. The two oil pipes 11 are respectively communicated with the two sealed cavities. A second pressing block 15 is fixedly connected inside the sliding cylinder 14. A plurality of second limiting holes 16 are provided on the surface of the second pressing block 15. A plurality of tensioning tendons 3 respectively pass through the plurality of second limiting holes 16. A second limiting buckle 17 is arranged inside the second limiting hole 16;

[0038] The pushing mechanism includes a plurality of sliding grooves 18, all of the plurality of sliding grooves 18 are formed on the surface of the blocking block 8, the plurality of sliding grooves 18 are arranged at equal angles, a push rod 19 is hinged in the sliding groove 18, the middle position of the push rod 19 is hinged in the sliding groove 18, the plurality of push rods 19 respectively correspond to the positions of a plurality of first limit buckles 7, the push rod 19 is telescopic, a sliding ring 20 is slidably connected to the surface of the blocking block 8, the sliding ring 20 is located at the position of the sliding groove 18, the end of the push rod 19 is hinged to the inner side of the sliding ring 20, a U-shaped pull rod 21 is slidably connected to the surface of the mounting cylinder 10, the pull rod 21 extends to the side of the sliding ring 20 away from the mounting cylinder 10, and the side of the pull rod 21 away from the blocking block 8 extends to the left side of the second pressing block 15;

[0039] The supporting mechanism includes a supporting plate 22, and the supporting plate 22 is elastically and slidably connected to the surface of the mounting cylinder 10;

[0040] In the process of building a prestressed bridge, after the construction of the bridge body 1 is completed, the tensioning bar 3 needs to be inserted into the tensioning hole 2, and then the stabilizing tube 4 is installed in the tensioning hole 2, the tensioning bar 3 will pass through the stabilizing tube 4, the first pressure block 5 is sleeved on the surface of the tensioning bar 3, the tensioning bar 3 will pass through the first limiting hole 6, and then the first limiting buckle 7 is sleeved on the surface of the tensioning bar 3, and then the first limiting buckle 7 is pushed into the first limiting hole 6, and then the blocking block 8 is sleeved on the surface of the tensioning bar 3 and the blocking block 8 is fit with the first pressure block 5, and then the tensioning bar 3 is passed through the fixed block 12, the fixed tube 13, the sliding tube 14, the second pressure block 15 and the second limiting buckle 17, and then the position of the installation tube 10 is adjusted so that the support plate 22 supports the installation tube 10 so that the installation tube 10 can be in In a horizontal state, the second pressing block 15 and the second limiting buckle 17 move to the same position of the tensioning bar, thereby ensuring that the subsequent second pressing block 15 and multiple second limiting buckles 17 can pull the tensioning bar 3 at the same time, so that the tensioning degrees of multiple tensioning bars 3 are the same, and then hydraulic oil is injected into the closed cavity close to the side of the bridge body 1 through the oil pipe 11. The sliding cylinder 14 will drive the second pressing block 15 to move together under the action of the hydraulic oil, and the second limiting buckle 17 will move into the second limiting hole 16 driven by the tensioning bar 3. The second limiting buckle 17 will be squeezed by the second limiting hole 16 to limit the tensioning bar 3. The second limiting buckle 17 will drive the tensioning bar 3 to move to the side away from the bridge body 1, and the tensioning bar 3 will be tightened. When the tensioning bar 3 is pulled out of the bridge body 1, The tensioning bar 3 will bring the first limit buckle 7 out of the first limit hole 6 position, and the first limit buckle 7 will move into the yield groove 9. The blocking block 8 will block the first limit buckle 7 to prevent the first limit buckle 7 from being driven a long distance by the tensioning bar 3, which will cause the tensioning bar 3 to move back more when it is released, reducing the tensioning effect. When the sliding cylinder 14 gradually moves to the side of the installation cylinder 10 away from the bridge body 1, the end of the sliding cylinder 14 will move to the position of the pulling rod 21, and the sliding cylinder 14 will drive the pulling rod 21 to move away from the bridge body 1. The movement of the pulling rod 21 will drive the sliding ring 20 to move together. The movement of the sliding ring 20 will drive the pushing rod 19 to swing, and the pushing rod 19 will push the first limit buckle 7 into the first limit hole 6, so that the first limit buckle 7 can make the first limiting buckle 7 be in the first limiting hole 6 to limit the tensioning bar 3 in time when the sliding cylinder 14 moves to the rear end of the installation cylinder 10, so as to avoid that when the sliding cylinder 14 moves to tighten the tensioning bar 3 and then releases it, the first limiting buckle 7 cannot limit the tensioning bar 3 in time, so that the tensioning bar 3 will move back and affect the tensioning effect. Then, when hydraulic oil is injected into the other oil pipe 11, the sliding cylinder 14 will move to the side close to the bridge body 1, and the tensioning bar 3 will drive the first limiting buckle 7 to move into the first limiting hole 6 and limit the tensioning bar 3, and the second limiting block will move out of the second limiting hole 16. Then, the two oil pipes 11 are alternately injected with hydraulic oil, and the sliding cylinder 14 can tighten the tensioning bar 3, thereby increasing the prestress of the bridge body 1.Ensure the strength of the bridge body 1.,

[0041] During the process of the sliding cylinder 14 moving to pull the tensioning tendon 3, when the sliding cylinder 14 moves back after pulling the tensioning tendon 3, it is necessary for manual operation to move the second limit buckle 17 back into the second limit hole 16. As a further solution of the present invention, a fixing rod 23 is fixedly connected to the surface of the second pressing block 15. A baffle 24 is elastically slidably connected to the surface of the fixing rod 23. A plurality of through holes 25 are formed in the surface of the baffle 24. The through holes 25 are located on one side of the second limit buckle 17. A plurality of tensioning tendons 3 pass through the plurality of through holes 25;

[0042] During the process of the sliding cylinder 14 moving to drive the second pressing block 15 and the second limit buckle 17 to move to pull the tensioning tendon 3, and then when moving back toward the bridge body 1 after pulling the tensioning tendon 3, the second limit buckle 17 will move out of the second limit hole 16, and the baffle 24 will block the second limit buckle 17. The baffle 24 can make the second limit buckle 17 move to a position where the restriction on the tensioning tendon 3 is released and will not be at a relatively far distance from the second pressing block 15. When the sliding cylinder 14 moves back away from the bridge body 1 subsequently, the second limit buckle 17 can quickly move into the second limit hole 16 under the action of the tensioning tendon 3 to limit the tensioning tendon 3, eliminating the need for manual operation to move the second limit buckle 17, which can reduce the adjustment time of the second limit buckle 17 during the reciprocating movement of the sliding cylinder 14 and improve the pulling efficiency of the tensioning tendon 3.

[0043] During the process of pulling the tensioning tendon 3, when the installation cylinder 10 and the sliding cylinder 14 are sleeved on the surface of the tensioning tendon 3, the tensioning tendon 3 cannot maintain a straightened state. As a further solution of the present invention, a plurality of pulling plates 26 are elastically hinged inside the surface of the baffle 24 away from it. The end of the pulling plate 26 is in contact with the surface of the tensioning tendon 3;

[0044] After the installation cylinder 10 and the sliding cylinder 14 are sleeved on the surface of the tensioning tendon 3, the tensioning tendon 3 will pass through the baffle 24. Subsequently, by pushing the baffle 24 toward the side close to the installation cylinder 10, the baffle 24 will drive the pulling plates 26 to move together. Then, when the baffle 24 moves away from the side of the installation cylinder 10, the pulling plates 26 will drive the tensioning tendon 3 to move together, so that a plurality of tensioning tendons 3 can be straightened before the sliding cylinder 14 pulls the tensioning tendon 3, ensuring that the second limit buckle 17 and the second pressing block 15 can simultaneously pull a plurality of tensioning tendons 3 when the sliding cylinder 14 moves subsequently, improving the pulling effect of the plurality of tensioning tendons 3 and enhancing the strength of the bridge body 1.

[0045] During the process of pulling the tensioning tendon 3, the baffle 24 will be relatively close to the second limit buckle 17 under the restriction of the pulling plate 26, which affects the second limit buckle 17 from moving out of the second limit hole 16. A further solution of the present invention is that a plurality of pushing rods 27 are fixedly connected to the surface of the second limit buckle 17 close to the pulling plate 26. The pushing rods 27 are located on the right side of the pulling plate 26 to push the pulling plate 26 away from the tensioning tendon 3 when the baffle 24 moves;

[0046] During the process of pulling the tensioning tendon 3, when the baffle 24 moves to a position relatively close to the second limit buckle 17, the pushing rod 27 will push the pulling plate 26, so that the end of the pulling plate 26 is separated from the tensioning tendon 3, so that the second limit buckle 17 can move out of the second limit hole 16 to release the limit on the tensioning tendon 3, ensuring the reciprocating movement of the sliding cylinder 14.

[0047] During the process of pulling the tensioning tendon 3, the friction between the pulling plate 26 and the tensioning tendon 3 is small. As a further solution of the present invention, a plurality of friction strips 28 are fixedly connected to the end of the pulling plate 26;

[0048] During the process of pulling the tensioning tendon 3, the friction strips 28 at the end of the pulling plate 26 will contact the tensioning tendon 3, increasing the friction between the pulling plate 26 and the tensioning tendon 3, ensuring that the pulling plate 26 can act on the movement of the tensioning tendon 3 and straightening the tensioning tendon 3.

Claims

1. A tensioning device for a prestressed anchor, comprising a bridge body (1), characterized in that: The bridge body (1) is provided with a plurality of tensioning holes (2) on its surface, the inner side of the end of the tensioning hole (2) being an inclined surface, a plurality of tensioning bars (3) being provided in the tensioning hole (2), a limiting mechanism being provided at the end of the tensioning hole (2), the limiting mechanism comprising a plurality of first limiting buckles (7) respectively provided on the surfaces of the plurality of tensioning bars (3), and the tensioning bars (3) being limited and fixed by the first limiting buckles (7), a blocking mechanism being provided on the surface of the limiting mechanism, the blocking mechanism being used to block the limiting mechanism, the tensioning mechanism being provided on the surface of the tensioning bars (3), The tensioning mechanism is used to tighten the tensioning bar (3); the limiting mechanism will release the limiting position of the tensioning bar (3) when the tensioning mechanism pulls the tensioning bar (3); a pushing mechanism is provided on the tensioning mechanism; the pushing mechanism is used to push the limiting mechanism toward a side close to the tensioning hole (2) to limit the tensioning bar (3) when the tensioning mechanism pulls the tensioning bar (3) to a preset position; a supporting mechanism is provided at the bottom of the tensioning mechanism; the supporting mechanism is used to support the tensioning mechanism when the tensioning mechanism is installed on the surface of the tensioning bar (3) so as to keep the tensioning mechanism stable; The blocking mechanism comprises a blocking block (8) penetrated by the tensioning bar (3), the blocking block (8) being sleeved on the surface of the tensioning bar (3), a clearance groove (9) being provided on the surface of the blocking block (8) on a side close to the bridge body (1), and an end of the first limiting buckle (7) being located in the clearance groove (9); The pushing mechanism comprises a plurality of sliding grooves (18), wherein the plurality of sliding grooves (18) are all provided on the surface of the blocking block (8), and the plurality of sliding grooves (18) are arranged at equal angles. A pushing rod (19) is hinged in the sliding groove (18), and the middle position of the pushing rod (19) is hinged in the sliding groove (18). The plurality of pushing rods (19) respectively correspond to the positions of the plurality of first limit buckles (7), and the pushing rod (19) is retractable. A sliding ring (20) is slidably connected to the surface of the blocking block (8), and the sliding ring (20) is located at the position of the sliding groove (18). The end of the pushing rod (19) is hinged to the inner side of the sliding ring (20). The tensioning mechanism is located on the side of the blocking block (8) away from the bridge body (1). A U-shaped pulling rod (21) is slidably provided on the tensioning mechanism, and the two ends of the pulling rod (21) extend to the left and right sides of the tensioning mechanism respectively. When the tensioning reinforcement (3) is tightened to a preset position, the tensioning mechanism pushes the pulling rod (21) to move.

2. A tensioning device for a prestressed anchor according to claim 1, characterized in that: The limiting mechanism comprises a stabilizing cylinder (4), the stabilizing cylinder (4) being fixedly mounted in the tensioning hole (2), the tensioning bar (3) passing through the stabilizing cylinder (4), a first pressing block (5) being sleeved on the surface of the tensioning bar (3), a plurality of first limiting holes (6) being formed on the surface of the first pressing block (5), a plurality of the tensioning bars (3) all passing through the plurality of first limiting holes (6), a first limiting buckle (7) being provided in the plurality of first limiting holes (6), a side surface of the first limiting buckle (7) being an inclined surface, and the first limiting buckle (7) will move into the first limiting hole (6) under the action of the tensioning bar (3) to limit the tensioning bar (3).

3. A tensioning device for a prestressed anchor according to claim 2, characterized in that: The tensioning mechanism comprises a mounting tube (10), wherein the mounting tube (10) is sleeved on the surface of the tensioning bar (3), the surface of the mounting tube (10) is connected to two oil pipes (11), a fixing block (12) is fixedly connected inside the mounting tube (10), the fixing block (12) is located on a side close to the blocking block (8), the tensioning bar (3) passes through the fixing block (12), the fixing block (12) is fitted with the blocking block (8), a fixing tube (13) is fixedly connected to the surface of the fixing block (12) on a side close to the mounting tube (10), and the mounting tube (10) ) is provided with a sliding cylinder (14) for internal sliding sealing, the sliding cylinder (14) is slidably connected to the surface of the fixed cylinder (13), the sliding cylinder (14) divides the interior of the mounting cylinder (10) into two closed chambers, the two oil pipes (11) are respectively connected to the two closed chambers, a second pressure block (15) is fixedly connected to the interior of the sliding cylinder (14), a plurality of second limiting holes (16) are provided on the surface of the second pressure block (15), a plurality of the tensioning bars (3) respectively pass through the plurality of second limiting holes (16), and a second limiting buckle (17) is provided inside the second limiting hole (16).

4. A tensioning device for a prestressed anchor according to claim 3, characterized in that: The support mechanism comprises a support plate (22), and the support plate (22) is elastically slidably connected to the surface of the mounting tube (10).

5. A tensioning device for a prestressed anchor according to claim 3, characterized in that: A fixing rod (23) is fixedly connected to the surface of the second pressing block (15), a baffle (24) is elastically slidably connected to the surface of the fixing rod (23), a plurality of through openings (25) are formed on the surface of the baffle (24), the through openings (25) are located on one side of the second limiting buckle (17), and a plurality of the tensioning bars (3) pass through the plurality of through openings (25).

6. A tensioning device for a prestressed anchor according to claim 5, characterized in that: A plurality of pulling plates (26) are elastically hingedly connected to the baffle plate (24) away from the surface, and the ends of the pulling plates (26) are in contact with the surface of the tensioning bar (3).

7. A tensioning device for a prestressed anchor according to claim 6, characterized in that: A plurality of push rods (27) are fixedly connected to a surface of the second limit buckle (17) on one side close to the pulling plate (26); the push rods (27) are located on the right side of the pulling plate (26) so as to push the pulling plate (26) away from the tensioning bar (3) when the baffle plate (24) moves.

8. A tensioning device for a prestressed anchor according to claim 6, characterized in that: A plurality of friction strips (28) are fixedly connected to the end of the pulling plate (26).

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