Anti-collapse device for prestressed tendon

Abstract

The utility model relates to the technical field of installation of prestressed tendons, in particular to an anti-collapse device for prestressed tendons, which comprises a connecting seat, an anchor backing plate fixedly arranged at the end of the connecting seat, a plurality of third notches formed in the side wall of the connecting seat, a cover plate fixedly arranged at the end of the anchor backing plate, a plurality of first notches formed in the side wall of the cover plate and a plurality of second notches formed in the side wall of the cover plate. Second sealing rings are connected to the inner side walls of the first notches in a clamped mode. Compared with a traditional anti-collapse device for the prestressed tendon, the anti-collapse device for the prestressed tendon is provided with the cover plate, the threaded column, the first notch, the positioning groove, the third clamping groove and the second sealing ring according to requirements, and the outer surface of the threaded column is sequentially sleeved with the positioning groove, so that the mounting and positioning precision of the cover plate is improved; the inner size of the third clamping groove is sequentially matched with the outer size of one end of the clamping block, the clamping stability of the clamping block is improved, the second sealing ring is evenly arranged on the outer surface of the prestressed tendon in a sleeving mode, the sealing performance of the first groove opening is improved, corrosion is avoided, and the tensioning safety and stability of the prestressed tendon are improved.

Description

Technical Field

[0001] This utility model relates to the field of prestressed tendon installation technology, and in particular to an anti-collapse device for prestressed tendons. Background Technology

[0002] Prestressing tendons are steel bars or wires used in prestressed concrete structures to apply prestress. Prestressing tendons improve the structural load-bearing capacity. Before the concrete structure bears external loads, the prestressing tendons apply compressive stress to the concrete. When the structure is under load, the tensile stress generated by the prestressing tendons cancels out the tensile stress generated by the external load, thus delaying the appearance and development of concrete cracks and improving the structure's crack resistance and load-bearing capacity. Prestressing tendons are widely used in various types of bridge structures, such as simply supported beam bridges, continuous beam bridges, cable-stayed bridges, and suspension bridges. By applying prestress, the cross-sectional dimensions of the beam can be reduced, the structural self-weight can be lightened, and the span and load-bearing capacity of the bridge can be increased. During the tensioning process, anti-collapse devices are needed to support both ends of the prestressing tendons.

[0003] Existing anti-collapse devices for prestressed tendons typically include anchor plates and clamps. Anchor plates are usually installed at both ends of the beam for clamping. The clamps are cone-shaped for inserting prestressed tendons. By tensioning the prestressed tendons, the clamps tighten under the action of friction, thereby clamping and fixing the two ends of the reinforcing bars, thus preventing the tensioned reinforcing bars from breaking or loosening.

[0004] In the use of existing anti-collapse devices for prestressed tendons, one end of the clamp is usually exposed at the end of the anchor plate. Since the beam consolidation takes a long time, the exposed clamp and the contact point of the prestressed tendon may corrode, thus affecting the stability of the prestressed tendon tensioning and consolidation. Utility Model Content

[0005] In order to overcome the problem that in the use of existing anti-collapse devices for prestressed tendons, one end of the clamp is usually exposed at the end of the anchor plate. Since the beam consolidation takes a long time, the exposed clamp and the contact point of the prestressed tendon may corrode, thus affecting the stability of the prestressed tendon tensioning and consolidation.

[0006] The technical solution of this utility model is as follows: a prestressed tendon anti-collapse device, including a connecting seat, an anchor plate fixedly provided at the end of the connecting seat, a plurality of third slots opened on the side wall of the connecting seat, a cover plate fixedly provided at the end of the anchor plate, a plurality of first slots opened on the side wall of the cover plate, a second sealing ring snapped into the inner side wall of each of the first slots, two threaded posts symmetrically fixed at the end of the anchor plate, two positioning grooves opened on the side wall of the cover plate, a plurality of second slots opened on the side wall of the anchor plate near the cover plate, a clamping assembly provided in the middle of each of the second slots, a clamping block provided in each of the clamping assemblies, a first slot opened on the inner side wall of each clamping block, and a third slot opened on the side wall of the cover plate near the clamping block.

[0007] Preferably, the first slot is connected to the third slot, the internal dimensions of the third slot are adapted to the external dimensions of one end of the clamping block, and the second sealing rings are all annular.

[0008] Preferably, the two positioning slots are symmetrically distributed for the insertion of threaded columns, and the ends of the threaded columns are threaded with nuts.

[0009] Preferably, the second slots are connected to the positioning slots, and each of the second slots is frustum-shaped. The internal dimensions of the second slots are adapted to the external dimensions of the other end of the clamping block, thereby improving the stability of the clamping block.

[0010] Preferably, a second slot is provided on the side wall of each clamping block, and a clamp is engaged inside the second slot.

[0011] Preferably, a fourth slot is provided on the side wall of the cover plate near the third slot, and a first sealing ring is engaged inside the fourth slot. The outer dimensions of the first sealing ring are adapted to the inner dimensions of the fourth slot, thereby improving the sealing performance of the connection between the cover plate and the anchor plate.

[0012] The beneficial effects of this utility model are:

[0013] Compared to traditional anti-collapse devices for prestressed tendons, this device incorporates a cover plate, threaded post, first slot, positioning slot, third slot, and second sealing ring, all designed to meet specific requirements. The positioning slot is sequentially fitted onto the outer surface of the threaded post to improve the positioning accuracy of the cover plate. The internal dimensions of the third slot are sequentially adapted to the external dimensions of one end of the clamping block, enhancing the stability of the clamping block connection. The second sealing ring is evenly fitted onto the outer surface of the prestressed tendon, improving the sealing of the first slot and thus preventing corrosion and enhancing the safety and stability of prestressed tendon tensioning. Furthermore, the inclusion of a fourth slot and a first sealing ring, with the first sealing ring being annular and matching the internal dimensions of the fourth slot, improves the sealing of the connection between the anchor plate and the cover plate. Attached Figure Description

[0014] Figure 1 The diagram shown is a three-dimensional structural schematic of an anti-collapse device for prestressed tendons according to this utility model.

[0015] Figure 2 The diagram shown is a schematic representation of the overall unfolded structure of an anti-collapse device for prestressed tendons according to this utility model.

[0016] Figure 3 The diagram shown is a schematic representation of the structure of a prestressed tendon anti-collapse device cover plate according to this utility model.

[0017] Figure 4 The diagram shown is a schematic diagram of the anchor plate structure of an anti-collapse device for prestressed tendons according to this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Connecting seat; 2. Anchor plate; 3. Cover plate; 4. Threaded post; 5. First groove; 6. Second groove; 7. Clamp assembly; 701. Clamping block; 702. First slot; 703. Second slot; 704. Clamp; 8. Positioning groove; 9. Third groove; 10. Third slot; 11. Fourth slot; 12. First sealing ring; 13. Second sealing ring. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Please see Figures 1-4 A prestressed tendon anti-collapse device includes a connecting seat 1, which is inserted into the interior of a beam. An anchor plate 2 is fixedly mounted on the end of the connecting seat 1 to form an integral structure, and the anchor plate 2 is used to support the end of the beam. Several third slots 9 are opened on the side wall of the connecting seat 1 for the insertion of prestressed tendons. A cover plate 3 is fixedly mounted on the end of the anchor plate 2. The cover plate 3 is disc-shaped and used for support and limitation. Several first slots 5 are opened on the side wall of the cover plate 3, and the first slots 5 and the third slots 9 correspond one-to-one for the insertion of prestressed tendons. A second sealing ring 13 is snapped onto the inner wall of the first slot 5. The second sealing ring 13 is elastic and can be sleeved on the outer surface of the prestressing tendon, thereby improving the sealing performance of the prestressing tendon inserted into the first slot 5. Two threaded posts 4 are symmetrically fixed at the end of the anchor plate 2. Two positioning grooves 8 are opened on the side wall of the cover plate 3. Several second slots 6 are opened on the side wall of the anchor plate 2 near the cover plate 3. A clamping assembly 7 is provided in the middle of each second slot 6. Each clamping assembly 7 includes a clamping block 701. The inner wall of the clamp 701 is provided with a first slot 702 for locking and limiting the prestressing tendon. After tensioning, the clamp 701 is sleeved on the outer surface of the prestressing tendon under the action of friction, thereby preventing the prestressing tendon from breaking and loosening. The cover plate 3 is provided with a third slot 10 on the side wall near the clamp 701. Two threaded posts 4 are inserted into the positioning groove 8 in sequence. The nut is threaded to the end of the threaded post 4 to initially fix the cover plate 3. The cover plate 3 can prevent the clamp 701 from sliding, loosening and falling off during tensioning, thus improving the tensioning efficiency. For safety, tighten the nut to make the cover plate 3 and the anchor plate 2 fit tightly together, so that the other end of the clamping block 701 is engaged in the third groove 10 to protect the clamping block 701. The internal dimensions of the third groove 10 are adapted to the external dimensions of one end of the clamping block 701, which improves the stability of the clamping of the clamping block 701. The second sealing ring 13 is evenly sleeved on the outer surface of the prestressing tendon to improve the sealing of the first groove 5, thereby reducing the corrosion of moisture in the air, and thus improving the safety and stability of the prestressing tendon tensioning.

[0021] Please see Figures 1-4The first slot 5 is connected to the third slot 10. The internal dimensions of the third slot 10 are adapted to the external dimensions of one end of the clamping block 701. The second sealing rings 13 are all annular. The two positioning slots 8 are symmetrically distributed for the threaded post 4 to be inserted. The ends of the threaded post 4 are all threaded with nuts. The second slot 6 is connected to the positioning slot 8. The second slot 6 is all frustum-shaped. The internal dimensions of the second slot 6 are adapted to the external dimensions of the other end of the clamping block 701, which improves the stability of the clamping block 701.

[0022] Please see Figures 3-4 Each clamping block 701 has a second slot 703 on its side wall. Each second slot 703 has a clamp 704 inside it. The clamp 704 is made of silicone and is in the shape of a ring. The clamp 704 inside the second slot 703 improves the stability of the clamping block 701 assembly and positioning. The cover plate 3 has a fourth slot 11 on its side wall near the third slot 10. The fourth slot 11 has a first sealing ring 12 inside it. The first sealing ring 12 is made of metal. The external dimensions of the first sealing ring 12 are adapted to the internal dimensions of the fourth slot 11, improving the sealing performance of the connection between the cover plate 3 and the anchor plate 2.

[0023] During operation, the operator first moves the device to the designated location, inserts the connecting seat 1 into the inside of the beam and fixes it together with concrete, so that the anchor plate 2 is supported at the end of the beam. The prestressing tendons are then inserted sequentially into the third slot 9 and through the second slot 6. Prestressing tendons are steel bars or wires used to apply prestress in prestressed concrete structures. Several sets of clamping blocks 701 are sequentially fitted onto the outer surface of the prestressing tendons, with the tips of the clamping blocks 701 engaging inside the second slot 6. The prestressing tendons are then sequentially inserted into the third slot 10 and the first slot 5. Nuts are threaded onto the end of the threaded post 4 to initially fix the cover plate 3. The cover plate 3 prevents the clamping blocks 701 from engaging. Tensioning prevents slippage and loosening, improving tensioning safety. When tensioning is complete, the clamp 701 is engaged inside the second slot 6 under the action of the friction force of the prestressing tendon, thus preventing the tendon from slipping, loosening, and breaking due to friction. The operator then tightens the nut to make the cover plate 3 and the anchor plate 2 fit tightly together, so that the other end of the clamp 701 is engaged in the third slot 10 to protect the clamp 701. The internal dimensions of the third slot 10 are adapted to the external dimensions of one end of the clamp 701, improving the stability of the clamp 701 engagement. The second sealing ring 13 is evenly fitted on the outer surface of the prestressing tendon, improving the sealing of the first slot 5, thereby improving the safety and stability of tensioning the first slot 5.

[0024] Through the above steps, by setting up a cover plate 3, a threaded post 4, a first groove 5, a positioning groove 8, a third slot 10, and a second sealing ring 13 according to requirements, the positioning groove 8 is sequentially fitted onto the outer surface of the threaded post 4 to improve the installation and positioning accuracy of the cover plate 3. The internal dimensions of the third slot 10 are sequentially adapted to the external dimensions of one end of the clamping block 701 to improve the clamping stability of the clamping block 701. The second sealing ring 13 is evenly fitted onto the outer surface of the prestressing tendon to improve the sealing performance of the first groove 5, thereby improving the safety and stability of the prestressing tendon tensioning.

Claims

1. A prestressed tendon anti-collapse device, comprising a connecting seat (1); characterized in that: An anchor plate (2) is fixed at the end of the connecting seat (1). Several third slots (9) are opened on the side wall of the connecting seat (1). A cover plate (3) is fixed at the end of the anchor plate (2). Several first slots (5) are opened on the side wall of the cover plate (3). A second sealing ring (13) is snapped on the inner side wall of each first slot (5). Two threaded posts (4) are symmetrically fixed at the end of the anchor plate (2). Two positioning grooves (8) are opened on the side wall of the cover plate (3). Several second slots (6) are opened on the side wall of the anchor plate (2) near the cover plate (3). A clamping assembly (7) is provided in the middle of each second slot (6). Each clamping assembly (7) includes a clamping block (701). A first slot (702) is opened on the inner side wall of each clamping block (701). A third slot (10) is opened on the side wall of the cover plate (3) near the clamping block (701).

2. The anti-collapse device for prestressed tendons according to claim 1, characterized in that: The first slot (5) is connected to the third slot (10). The internal dimensions of the third slot (10) are adapted to the external dimensions of one end of the clamping block (701). The second sealing rings (13) are all annular.

3. The anti-collapse device for prestressed tendons according to claim 2, characterized in that: Two positioning slots (8) are symmetrically distributed for the insertion of threaded columns (4), and the ends of the threaded columns (4) are threaded with nuts.

4. The anti-collapse device for prestressed tendons according to claim 1, characterized in that: The second slot (6) is connected to the positioning slot (8) respectively. The second slot (6) is truncated cone-shaped. The internal dimensions of the second slot (6) are adapted to the external dimensions of the other end of the clamping block (701).

5. The anti-collapse device for prestressed tendons according to claim 1, characterized in that: Each clamping block (701) has a second slot (703) on its side wall, and each second slot (703) has a clamp (704) inside it.

6. The anti-collapse device for prestressed tendons according to claim 1, characterized in that: A fourth slot (11) is provided on the side wall of the cover plate (3) near the third slot (10). A first sealing ring (12) is engaged inside the fourth slot (11). The external dimensions of the first sealing ring (12) are compatible with the internal dimensions of the fourth slot (11).

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