Post-tensioning method prestress tensioning structure of beam

Abstract

The invention discloses a post-tensioning method prestress tensioning structure of a beam, and belongs to the technical field of building construction. Comprising an abutting ring, screws are symmetrically arranged on the abutting ring, one end of each screw is fixed to the abutting ring, an installation ring and a limiting ring are arranged on each screw, each installation ring is located between the corresponding abutting ring and the corresponding limiting ring, a hydraulic jack is arranged in the middle of each installation ring, and the outer surface of each hydraulic jack is connected to the inner ring of the corresponding installation ring. An end anchor cup is arranged in the middle of the limiting ring, an end clamping piece is arranged on the end anchor cup, the end anchor cup is connected to the inner ring of the limiting ring, an adjusting nut is arranged on the portion, between the abutting ring and the installation ring, of the screw rod, and a limiting nut is arranged on the portion, between the installation ring and the limiting ring, of the screw rod. And the adjusting nut and the limiting nut are both in threaded connection with the screw rod. According to the technical scheme, the steel strand is prevented from rebounding after being tensioned, and the tensioning effect on the steel strand is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and particularly relates to a post-tensioning prestressed tensioning structure for beams. Background Art

[0002] Post-tensioning is a prestressed concrete construction method, and its main construction process is as follows: fabricating components and reserving ducts: first, pouring concrete components and reserving ducts at the positions of prestressing tendons in the components; threading the tendons after the concrete strength reaches the requirement: when the concrete strength reaches more than 75% of the design strength, threading the prestressing tendons into the reserved ducts; tensioning the prestressing tendons: using tensioning equipment to tension the prestressing tendons to make them reach the control stress specified in the design; anchoring the prestressing tendons: using anchors to anchor the tensioned prestressing tendons at the ends of the components, relying on the anchors to prevent the elastic rebound of the prestressing tendons, so that the concrete obtains prestress; grouting the ducts: finally, pouring cement slurry into the ducts to form an integral body of the prestressing tendons and the concrete components.

[0003] During construction, when stretching the steel strand with a tensioning device, it is necessary to sleeved a tapered wedge on the steel strand. By using the rebound of the steel strand after it is released, the tapered wedge is inserted into the hole position of the anchor cup to tighten the steel strand (prestress loss generally occurs at the end of traditional prestress loading. Due to the retraction of the prestressing tendon, the fixture and the anchor ring are tightened, resulting in the loss of the applied prestress). This method requires applying a greater force than the designed prestress to stretch the steel strand, and it is difficult to generate the tension. In particular, after the steel strand rebounds, the prestress applied by the steel strand on the structure often has a large difference from the designed prestress, which will inevitably have a great impact on the project quality.

[0004] The prior art also discloses a device for preventing the rebound of the steel strand. For example, a bridge prestress tensioning device with the patent number CN201510087501.2 includes a bridge, a stress hole arranged in the bridge, a steel strand passing through the prestress hole, a front-end tapered wedge slidably fitted on the steel strand, and a first-stage oil cylinder and a second-stage oil cylinder which are oppositely arranged and interconnected; a first-stage piston fixedly connected with the steel strand is arranged in the first-stage oil cylinder, a second-stage piston for pushing the front-end tapered wedge into the stress hole is arranged in the second-stage oil cylinder, and an elastic locking mechanism for locking the outward sliding of the second-stage piston is arranged in the cylinder wall of the second-stage oil cylinder;

[0005] In the above-mentioned tensioning device, by setting the elastic locking mechanism, although the movement timing of the secondary piston can be delayed to a certain extent, and then after the tensioning is completed, the secondary piston is used to push and lock the wedge-shaped clamp. However, this method has serious deficiencies in actual use. First of all, it is difficult for the elastic locking mechanism to control the precise locking torque, and thus it is impossible to ensure that when the secondary piston works, the tensioning torque of the steel strand has reached the tensioning requirement. Secondly, since the first-stage oil cylinder and the second-stage oil cylinder are connected, the internal pressure is the same and relatively large. That is, when the elastic locking mechanism is released, the secondary piston will pop out quickly, causing unnecessary danger. At the same time, when the secondary piston pops out, the internal space increases, that is, the internal pressure decreases, and the first-stage piston will also retract, resulting in a change in the tensioning torque of the steel strand. At the same time, after the secondary piston is released, it pops out quickly, which is also likely to cause danger. Therefore, the device for preventing rebound in the prior art cannot accurately control the pre-stress loading value of the steel strand. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a post-tensioning prestressed tensioning structure for a beam to avoid the rebound of the steel strand after the tensioning is completed and improve the tensioning effect on the steel strand.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A post-tensioning prestressed tensioning structure for a beam of the present invention includes a contact ring. Symmetrically arranged on the contact ring are screw rods. One end of each screw rod is fixed to the contact ring. An installation ring and a limit ring are arranged on the screw rod. The installation ring is located between the contact ring and the limit ring. In the middle of the installation ring is a hydraulic jack. The outer surface of the hydraulic jack is connected to the inner ring of the installation ring. In the middle of the limit ring is an end anchor cup. End wedge-shaped clamps are arranged on the end anchor cup. The end anchor cup is connected to the inner ring of the limit ring. An adjusting nut is arranged on the screw rod between the contact ring and the installation ring. A limit nut is arranged on the screw rod between the installation ring and the limit ring. Both the adjusting nut and the limit nut are threadedly connected to the screw rod. The structure further includes a locking anchor cup arranged at the end position of the concrete beam. Locking wedge-shaped clamps are arranged on the locking anchor cup. The prestressed tendon passes through the end of the concrete beam and sequentially passes through the locking anchor cup, the hydraulic jack and the end anchor cup. When the prestressed tendon is tensioned, the adjusting nut contacts the installation ring. One end of the hydraulic jack acts on the end anchor cup, pushing the end anchor cup outwards. After pushing to the designated position, the limit nut is made to contact the limit ring to limit the tensioning position of the prestressed tendon. When the tensioning of the prestressed tendon is completed, the adjusting nut is separated from the contact with the installation ring. The hydraulic jack continues to push. At this time, the other end of the hydraulic jack moves towards the locking anchor cup and squeezes the locking wedge-shaped clamps into the locking anchor cup to lock the prestressed tendon on the locking anchor cup.

[0009] Furthermore, an annular flexible cover is provided between the abutting ring and the mounting ring, and two ends of the annular flexible cover are respectively detachably connected to the abutting ring and the mounting ring.

[0010] Furthermore, a pressing plate is provided between the locking anchor cup and the hydraulic jack. Through holes corresponding to the number of prestressing tendons are provided on the pressing plate, and a plurality of the through holes are respectively sleeved on a plurality of the prestressing tendons in a sliding manner.

[0011] Furthermore, a plurality of columnar blind holes are provided on the locking anchor cup. Springs are arranged in the columnar blind holes. One end of each spring is fixed in the columnar blind hole, a top plate is arranged at the other end of each spring, the top plate is fixed at the end of the spring, a top column is arranged on the top plate, one end of the top column is fixed on the top plate, and the other end of the top column faces the pressing plate.

[0012] Furthermore, a plurality of wedge-shaped grooves are circumferentially arranged at one end of the locking anchor cup located in a receiving groove provided on the concrete beam. First wedge-shaped blocks are arranged in the wedge-shaped grooves. A second wedge-shaped block is arranged on a surface of each first wedge-shaped block facing the inner wall of the receiving groove. A fixing plate is arranged on the locking anchor cup. A limiting column is arranged on the fixing plate. One end of the limiting column is fixed on the fixing plate, the other end of the limiting column passes through an end of the second wedge-shaped block, and the second wedge-shaped block is slidably connected to the limiting column. A locking nut is arranged at the other end of the limiting column. When the end of the second wedge-shaped block is pressed, the end of the second wedge-shaped block pushes the first wedge-shaped block to move towards the middle of the locking anchor cup, thereby jacking the locking anchor cup outwards and separating the bottom surface of the locking anchor cup from the bottom surface of the receiving groove.

[0013] Furthermore, the contact surfaces of the first wedge-shaped block and the second wedge-shaped block are both wedge-shaped surfaces, and baffles are arranged on two sides of the first wedge-shaped block, and the baffles are fixed on the first wedge-shaped block.

[0014] Furthermore, a rubber pad is arranged on a side surface of the abutting ring in contact with the concrete beam.

[0015] Furthermore, a retaining ring is arranged on the end anchor cup. The inner ring of the retaining ring is threadedly connected to the outer side surface of the end anchor cup, and the retaining ring is in contact with the outer side surface of the limiting ring.

[0016] The beneficial effects of the present invention are as follows:

[0017] In this technical solution, through a simple structural design, the movable end and the limiting end of the hydraulic jack can be changed, so that the movement direction of the hydraulic jack can be reversed. That is, the tensioning operation of the prestressing tendons and the pushing operation of the locking clamping pieces can be completed by one hydraulic jack, thereby avoiding the problem that the prestressing tendons rebound when the tensioning device is removed after the tensioning is completed, resulting in deviation of the prestress.

[0018] Other advantages, objects, and features of the present invention will be set forth in the following description, and to some extent will be obvious to those skilled in the art, or can be taught to those skilled in the art from the practice of the present invention. The objects and other advantages of the present invention can be achieved and obtained through the following description. Brief Description of the Drawings

[0019] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the following drawings are provided for the description of the present invention:

[0020] Figure 1 A three-dimensional schematic diagram of the prestressed tensioning structure of the present invention acting on the end of a concrete beam;

[0021] Figure 2 A three-dimensional schematic diagram of the prestressed tensioning structure of the present invention;

[0022] Figure 3 A three-dimensional schematic diagram of another perspective of the prestressed tensioning structure of the present invention;

[0023] Figure 4 A three-dimensional schematic diagram of the second wedge block located in the receiving groove in the prestressed tensioning structure of the present invention;

[0024] Figure 5 A three-dimensional schematic diagram of the first wedge block and the second wedge block provided on the locking anchor cup in the prestressed tensioning structure of the present invention;

[0025] Figure 6 A three-dimensional schematic diagram of the wedge groove and the columnar blind hole provided on the locking anchor cup in the prestressed tensioning structure of the present invention;

[0026] Figure 7 A three-dimensional schematic diagram of the pressure plate, spring, and top column in the prestressed tensioning structure of the present invention.

[0027] The reference numerals in the drawings are as follows:

[0028] 1, concrete beam; 2, receiving groove; 3, prestressed tendon; 4, locking anchor cup; 5, locking wedge; 6, abutting ring; 7, screw; 8, mounting ring; 9, adjusting nut; 10, hydraulic jack; 11, limiting ring; 12, limiting nut; 13, end anchor cup; 14, end wedge; 15, retaining ring; 16, pressure plate; 17, top column; 18, top plate; 19, spring; 20, columnar blind hole; 21, wedge groove; 22, first wedge block; 23, baffle; 24, second wedge block; 25, fixing plate; 26, limiting column; 27, locking nut; 28, annular flexible cover. Detailed Embodiments

[0029] As Figures 1 to 7As shown in the figure, a post-tensioning prestressing structure for a beam includes a butting ring 6. Symmetrically arranged on the butting ring 6 are screw rods 7. One end of each screw rod 7 is fixed to the butting ring 6. An installation ring 8 and a limiting ring 11 are provided on the screw rod 7. The installation ring 8 is located between the butting ring 6 and the limiting ring 11. In the middle of the installation ring 8 is a hydraulic jack 10. The outer surface of the hydraulic jack 10 is connected to the inner ring of the installation ring 8. In the middle of the limiting ring 11 is an end anchor cup 13. End clamping pieces 14 are provided on the end anchor cup 13. The end anchor cup 13 is connected to the inner ring of the limiting ring 11. An adjusting nut 9 is provided on the screw rod 7 between the butting ring 6 and the installation ring 8. A limiting nut 12 is provided on the screw rod 7 between the installation ring 8 and the limiting ring 11. Both the adjusting nut 9 and the limiting nut 12 are threadedly connected to the screw rod 7. Also included is a locking anchor cup 4 provided at the end position of the concrete beam 1. Locking clamping pieces 5 are provided on the locking anchor cup 4. The prestressing tendon 3 passes through the end of the concrete beam 1 and sequentially passes through the locking anchor cup 4, the hydraulic jack 10, and the end anchor cup 13. When the prestressing tendon 3 is tensioned, the adjusting nut 9 contacts the installation ring 8. One end of the hydraulic jack 10 acts on the end anchor cup 13, pushing the end anchor cup 13 outwards. After pushing to the designated position, the limiting nut 12 contacts the limiting ring 11 to limit the tensioning position of the prestressing tendon 3. When the tensioning of the prestressing tendon 3 is completed, the adjusting nut 9 is disengaged from the contact with the installation ring 8. The hydraulic jack 10 continues to push. At this time, the other end of the hydraulic jack 10 moves towards the locking anchor cup 4 and squeezes the locking clamping pieces 5 into the locking anchor cup 4 to lock the prestressing tendon 3 onto the locking anchor cup 4.

[0030] The working principle of the above technical solution is as follows:

[0031] The tensioning principle is as follows: Use a crane to lift this device to the end of the concrete beam 1. Then, put the prestressing tendon 3 passing through the end of the concrete beam 1 onto the locking anchor cup 4 so that the locking anchor cup 4 is located at the end position of the concrete beam 1. Then, let the end of the prestressing tendon 3 pass through the hydraulic jack 10 and the end anchor cup 13, and lock the end of the prestressing tendon 3 onto the end anchor cup 13 through the end clamping pieces 14. At this time, make the butting ring 6 contact the end of the concrete beam 1, and then rotate the adjusting nut 9 to contact the installation ring 8 to limit the movement of the installation ring 8 towards the concrete beam 1. At this time, the end of the hydraulic jack 10 does not contact the locking clamping pieces 5 on the locking anchor cup 4. Then start the hydraulic jack 10. Since the movement of the installation ring 8 towards the concrete beam 1 is limited, the output end of the hydraulic jack 10 will push the end anchor cup 13 outwards, thereby tensioning the prestressing tendon 3.

[0032] The principle of preventing the prestressed tendon 3 from rebounding is as follows: When the force sensor and other force measuring components provided on the prestressed tendon 3 show that the prestressed tendon 3 is tensioned to meet the requirements, at this time, the limit nut 12 is rotated to contact the limit ring 11, that is, the movement of the limit ring 11 towards the concrete beam 1 is restricted. That is, at this time, the tensioning length and moment of the prestressed tendon 3 are fixed. Then, the adjusting nut 9 is rotated to disengage from the mounting ring 8. That is, at this time, the mounting ring 8 can move towards one end of the concrete beam 1. That is, at this time, the hydraulic jack 10 continues to extend. Since one end is blocked by the limit ring 11, the other end will move towards the locking anchor cup 4. That is, the end of the hydraulic jack 10 will act on the locking wedge 5 and push the locking wedge 5 into the locking anchor cup 4 to lock the prestressed tendon 3. That is, it avoids the problem that when the end anchor cup 13 is loosened, the prestressed tendon 3 rebounds, resulting in deviation of the tensioning moment.

[0033] In this technical solution, through a simple structural design, the movable end and the limit end of the hydraulic jack 10 can be changed, so that the movement direction of the hydraulic jack 10 can be reversed, enabling one hydraulic jack 10 to complete the tensioning operation of the prestressed tendon 3 and the pushing operation of the locking wedge 5. That is, it avoids the problem that when the tensioning device is removed after tensioning, the prestressed tendon 3 rebounds, resulting in deviation of the prestress.

[0034] In an implementable manner, an annular flexible cover 28 is provided between the abutting ring 6 and the mounting ring 8. The two ends of the annular flexible cover 28 are respectively detachably connected to the abutting ring 6 and the mounting ring 8. The annular flexible cover 28 shields the prestressed tendon 3 exposed during tensioning, avoiding debris splashing and causing harm to the operator in case of accidental breakage.

[0035] In an implementable manner, a pressing plate 16 is provided between the locking anchor cup 4 and the hydraulic jack 10. Through holes corresponding to the number of prestressed tendons 3 are provided on the pressing plate 16, and several through holes are respectively slidably sleeved on several prestressed tendons 3. Since the middle part of the hydraulic jack 10 is hollow, it cannot contact all the locking wedges 5 on the locking anchor cup 4. Therefore, the pressing plate 16 is provided. The end of the hydraulic jack 10 pushes the pressing plate 16 to make the pressing plate 16 contact the locking wedges 5 on each prestressed tendon 3, and then all the locking wedges 5 can be pushed into the locking anchor cup 4, improving the locking effect and further improving the effect of preventing rebound.

[0036] In an implementable manner, several cylindrical blind holes 20 are provided on the locking anchor cup 4. Springs 19 are provided in the cylindrical blind holes 20. One end of each spring 19 is fixed in the cylindrical blind hole 20, and a top plate 18 is provided at the other end of the spring 19. The top plate 18 is fixed to the end of the spring 19. A top column 17 is provided on the top plate 18. One end of the top column 17 is fixed to the top plate 18, and the other end of the top column 17 faces the pressing plate 16.

[0037] When the pressing plate 16 is pushed by the hydraulic jack 10 towards the locking anchor cup 4, it will first come into contact with the top column 17. That is, the top column 17 will push the spring 19, and then push the locking anchor cup 4 to move on the prestressed tendon 3, so that the end of the locking anchor cup 4 abuts tightly against the receiving groove 2 provided on the concrete beam 1. Then, when the hydraulic jack 10 continues to push the pressing plate 16, the pressing plate 16 will push the top column 17 to compress the spring 19, causing the top column 17 to enter the cylindrical blind hole 20, and then the pressing plate 16 will contact and push the locking clip 5. The advantage of this setting is that when the pressing plate 16 contacts the locking clip 5, the end of the locking anchor cup 4 abuts tightly against the receiving groove 2. That is, after the locking clip 5 is locked, the position of the locking anchor cup 4 will not change, further avoiding the subsequent situation of the prestressed tendon 3 generating rebound displacement (if it is locked before reaching the position, the subsequent prestressed tendon 3 will rebound and pull the locking anchor cup 4 to abut against the concrete beam 1);

[0038] At the same time, this method can also avoid the large sliding friction force between the locking anchor cup 4 and the prestressed tendon 3, resulting in the need for a certain torque for the locking anchor cup 4 to slide to the designated position. At this time, if the top column 17 is not provided, then the pressing plate 16 directly contacts the locking clip 5, and the locking anchor cup 4 needs a torque to be pushed to slide. Then it may cause the problem that the locking anchor cup 4 does not move into the receiving groove 2, and the pressing plate 16 will push the locking clip 5 into the locking anchor cup 4, making it more difficult for the locking anchor cup 4 to move to the designated position.

[0039] In an implementable manner, a plurality of wedge-shaped grooves 21 are provided on the circumference of one end of the locking anchor cup 4 located in the receiving groove 2 provided on the concrete beam 1. First wedge-shaped blocks 22 are provided in the wedge-shaped grooves 21. A second wedge-shaped block 24 is provided on a surface of the first wedge-shaped block 22 facing the inner wall of the receiving groove 2. A fixing plate 25 is provided on the locking anchor cup 4. A limiting column 26 is provided on the fixing plate 25. One end of the limiting column 26 is fixed to the fixing plate 25. The other end of the limiting column 26 passes through the end of the second wedge-shaped block 24, and the second wedge-shaped block 24 is slidably connected to the limiting column 26. A locking nut 27 is provided at the other end of the limiting column 26. When the end of the second wedge-shaped block 24 is pressed, the end of the second wedge-shaped block 24 pushes the first wedge-shaped block 22 towards the middle of the locking anchor cup 4, and then jacks up the locking anchor cup 4 outward, so that the bottom surface of the locking anchor cup 4 is separated from the bottom surface of the receiving groove 2.

[0040] It is not difficult to understand that the prestressed tendon 3 will produce prestress loss after being tensioned for a period of time. In the prior art, after the prestress loss occurs, it is necessary to re-tension, and it is necessary to sleeve the hydraulic jack 10 and the anchor cup, etc. This method does not change the operation and has a large workload; therefore, in the present technical solution, after the prestress loss occurs, it is only necessary to use the ends of the hydraulic jack 10 to act on the second wedge block 24 at the same time (the middle part of the hydraulic jack 10 is hollow and the edge is round, that is, the edge can just abut against the round The second wedge block 24 is squeezed, that is, the second wedge block 24 pushes the first wedge block 22 to move inwardly. Under the action of the wedge groove 21, the second wedge block 24 will lift the locking anchor cup 4 upward, which can be decomposed into the moving distance of the prestressed tendon 3. Therefore, the loss of the prestressed tendon 3 can be compensated. After it is lifted to a certain height, it is only necessary to fix the position of the second wedge block 24 by the locking nut 27 to achieve the locking of the lifting position.

[0041] It is not difficult to understand that the setting of the top column 17 and the spring 19 is preferably that the pressure plate 16 contacts the end of the hydraulic jack 10 during tensioning, and at the same time, the pressure plate 16 presses the locking anchor cup 4 against the receiving groove 2 through the top column 17 (this can be achieved by changing the position of the adjusting nut 9, and it is not difficult to understand that the pressure plate 16 is not in contact with the locking clip 5 at this time), that is, the first wedge block 22 is squeezed by the locking anchor cup 4 and into the receiving groove 2 (because the first wedge block 22 can easily slide out of the wedge groove 2 of the locking anchor cup 4 under normal conditions), thereby avoiding the problem of falling off during tensioning.

[0042] In one practicable manner, the contact surfaces of the first wedge block 22 and the second wedge block 24 are both wedge-shaped surfaces, and baffles 23 are provided on both sides of the first wedge block 22. The baffles 23 are fixed on the first wedge block 22. The baffles can limit the rotation of the second wedge block 24 to avoid the problem of rotation when squeezed.

[0043] In an practicable manner, a rubber pad is provided on the side of the abutment ring 6 that contacts the concrete beam 1 .

[0044] In one feasible manner, a retaining ring 15 is provided on the end anchor cup 13, and the inner ring of the retaining ring 15 is threadedly connected to the outer surface of the end anchor cup 13. The retaining ring 15 contacts the outer surface of the limiting ring 11. The retaining ring 15 can prevent the end anchor cup 13 from moving when it is pulled, thereby achieving tensioning and facilitating disassembly at a later time.

[0045] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A post-tensioned prestressed structure of a beam, characterized in that: The invention comprises an abutment ring (6), wherein a screw rod (7) is symmetrically arranged on the abutment ring (6), one end of the screw rod (7) is fixed on the abutment ring (6), a mounting ring (8) and a limiting ring (11) are arranged on the screw rod (7), the mounting ring (8) is located between the abutment ring (6) and the limiting ring (11), a hydraulic jack (10) is arranged in the middle of the mounting ring (8), the outer surface of the hydraulic jack (10) is connected to the inner ring of the mounting ring (8), and the limiting ring (11) is arranged in the middle of the mounting ring (8). An end anchor cup (13), the end anchor cup (13) is provided with an end clip (14), the end anchor cup (13) is connected to the inner ring of the limiting ring (11), an adjusting nut (9) is provided on the screw rod (7) between the abutment ring (6) and the mounting ring (8), a limiting nut (12) is provided on the screw rod (7) between the mounting ring (8) and the limiting ring (11), the adjusting nut (9) and the limiting nut (12) are both threadedly connected to the screw rod (7), and also includes a screw rod (14) arranged on the concrete beam. (1) A locking anchor cup (4) is arranged at the end position, and a locking clip (5) is arranged on the locking anchor cup (4). The prestressed tendon (3) passes through the end of the concrete beam (1) and passes through the locking anchor cup (4), the hydraulic jack (10) and the end anchor cup (13) in sequence. When the prestressed tendon (3) is tensioned, the adjusting nut (9) and the mounting ring (8) are in contact, and one end of the hydraulic jack (10) acts on the end anchor cup (13) to push the end anchor cup (13) outward. After being pushed to a designated position, the limiting nut (12) contacts the limiting ring (11) to limit the tensioning position of the prestressed tendon (3). When the tensioning of the prestressed tendon (3) is completed, the adjusting nut (9) is separated from the contact with the mounting ring (8), and the hydraulic jack (10) continues to push. At this time, the other end of the hydraulic jack (10) moves toward the locking anchor cup (4) and squeezes the locking clip (5) into the locking anchor cup (4), thereby locking the prestressed tendon (3) on the locking anchor cup (4).

2. The post-tensioned prestressed structure of a beam according to claim 1, characterized in that: An annular flexible cover (28) is provided between the abutment ring (6) and the mounting ring (8), and two ends of the annular flexible cover (28) are detachably connected to the abutment ring (6) and the mounting ring (8), respectively.

3. The post-tensioned prestressed structure of a beam according to claim 1, characterized in that: A pressure plate (16) is provided between the locking anchor cup (4) and the hydraulic jack (10), and the pressure plate (16) is provided with through holes corresponding to the number of prestressed tendons (3), and a plurality of the through holes are respectively slidably sleeved on a plurality of the prestressed tendons (3).

4. The post-tensioned prestressed structure of a beam according to claim 3, characterized in that: The locking anchor cup (4) is provided with a plurality of columnar blind holes (20), each of the columnar blind holes (20) being provided with a spring (19), one end of the spring (19) being fixed in the columnar blind hole (20), a top plate (18) being provided on the other end of the spring (19), the top plate (18) being fixed on the end of the spring (19), a top column (17) being provided on the top plate (18), one end of the top column (17) being fixed on the top plate (18), and the other end of the top column (17) being arranged toward the pressure plate (16).

5. The post-tensioned prestressed structure of a beam according to claim 4, characterized in that: A plurality of wedge-shaped grooves (21) are provided on the circumference of one end of the locking anchor cup (4) located in the receiving groove (2) provided on the concrete beam (1), each of the wedge-shaped grooves (21) is provided with a first wedge-shaped block (22), a second wedge-shaped block (24) is provided on a surface of the first wedge-shaped block (22) facing the inner wall of the receiving groove (2), a fixing plate (25) is provided on the locking anchor cup (4), a limiting column (26) is provided on the fixing plate (25), one end of the limiting column (26) is fixed on the fixing plate (25), and the fixing plate (25) is provided with a fixing column (26). The other end of the limiting column (26) passes through the end of the second wedge block (24), and the second wedge block (24) is slidably connected to the limiting column (26). A locking nut (27) is provided on the other end of the limiting column (26). When the end of the second wedge block (24) is pressed, the end of the second wedge block (24) pushes the first wedge block (22) to move toward the middle of the locking anchor cup (4), thereby pushing the locking anchor cup (4) outward, so that the bottom surface of the locking anchor cup (4) is separated from the bottom surface of the accommodating groove (2).

6. The post-tensioned prestressed structure of a beam according to claim 5, characterized in that: The contact surfaces of the first wedge block (22) and the second wedge block (24) are both wedge-shaped surfaces, and baffles (23) are provided on both sides of the first wedge block (22), and the baffles (23) are fixed on the first wedge block (22).

7. The post-tensioned prestressed structure of a beam according to claim 1, characterized in that: A rubber pad is provided on the side surface of the abutment ring (6) that contacts the concrete beam (1).

8. The post-tensioned prestressed structure of a beam according to claim 1, characterized in that: The end anchor cup (13) is provided with a retaining ring (15), the inner ring of the retaining ring (15) is threadedly connected to the outer surface of the end anchor cup (13), and the retaining ring (15) contacts the outer surface of the limiting ring (11).

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