Clamping piece type anchorage device

Abstract

The utility model relates to the technical field of prestressed anchorage devices, in particular to a clamping piece type anchorage device which comprises an anchor ring and a clamping piece set which is of a circular tube structure and composed of at least two clamping pieces movably sleeved in a taper hole of the anchor ring, and the outer surface of one side of each clamping piece is of a taper structure. A threaded groove and a release groove are sequentially formed in an inner cavity of the clamping piece in the direction from the narrow opening end of the clamping piece to the wide opening end of the clamping piece, the release groove is communicated with the threaded groove, a limiting groove is formed in the inner cavity of the clamping piece and located in the groove wall of the release groove, a fixing piece of an arc-shaped structure is arranged at the wide face end of the clamping piece, and the fixing piece and the clamping piece are of an integrated structure. A fixing groove is formed in the outer surface of the fixing piece, and the central axes of the fixing groove, the threaded groove and the releasing groove, the fixing piece and the clamping piece are located on the same axis. The utility model provides a clamping piece type anchorage device which is convenient to seal a gap between a clamping piece and a steel strand and convenient to disassemble, and is used for overcoming the defects in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchor technology, specifically to a wedge-type anchor. Background Technology

[0002] Prestressed concrete engineering is a widely used technology in the construction industry. It involves applying prestress to the steel strands in structural members to pre-stress and compressively deform them in the tension zone. This allows the structural members to effectively counteract the tensile stress caused by external loads, significantly improving their crack resistance and stiffness. This construction method enhances the overall stability of the structure, delays the appearance of cracks, and extends the service life and durability of the structure. In prestressed concrete engineering, wedge-type anchors are commonly used. Their working principle is based on the wedge-tightening principle of conical holes to anchor the steel strands. In practice, jacks are first used to prestress the steel strands until the designed pressure value is reached. Then, the jacks are gradually released, and the wedges of the anchor, driven by the steel strands, enter the conical holes of the anchor ring. The conical holes compress the wedges, thus anchoring the steel strands. In this way, the pressure exerted by the steel strand bundle can be transmitted to the building structure through the anchor plate and pad, forming a long-term and effective prestressed state, ensuring the safety and stability of the structure.

[0003] Based on practical application needs, wedge-type anchors can be divided into two main categories: working anchors and tool anchors. Working anchors are installed in structural components and bear the crucial responsibility of maintaining prestress over a long period. Therefore, once installed, a working anchor becomes an integral part of the structural component and cannot be disassembled during the structure's service life. Tool anchors, on the other hand, are primarily used in prestressed engineering processes for tensioning and anchoring prestressed steel strands. Therefore, tool anchors must be designed for reusability, meaning they should be easily disassembled and reinstalled after each tensioning operation to facilitate reuse in different structural projects or at different stages of the same structure. Furthermore, tool anchors should be easily disassembled after tensioning the steel strands to meet the specific requirements of prestressed steel strand construction, thereby ensuring high efficiency and economy in construction.

[0004] However, the key to the design of working anchors lies in ensuring that they can withstand prestress for extended periods. This requires a good seal between the wedges and the prestressed steel strands to prevent corrosion. In reality, however, the gaps between the outer side of the wedges and the prestressed steel strands are not effectively sealed. This allows rainwater or dust to seep through these gaps, corroding the wedges and prestressed steel strands and affecting the long-term use of the working anchor. Furthermore, for tool anchors, because the wedges are located within the tapered holes of the anchor ring and are wrapped around the prestressed steel strands, they are difficult to grasp. Therefore, before disassembling a tool anchor, the steel strands must be cut and then pulled out of the tool anchor. However, if the distance between the tool anchor and the working anchor is too close, the cutting tool cannot easily penetrate between them, making it difficult to cut the steel strands and thus hindering the disassembly of the tool anchor. Therefore, there is room for improvement in the sealing and disassembly of wedge-type anchors to facilitate the sealing and disassembly of the wedges, better meet the needs of prestressed engineering, and also help to increase the market promotion of wedge-type anchors. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a clamp-type anchor that facilitates sealing the gap between the clamp and the steel strand and allows for easy disassembly, thereby overcoming the deficiencies in existing technologies.

[0006] The technical solution adopted by this utility model is as follows: a clamp-type anchor, including an anchor ring and at least two clamps movably fitted inside the conical hole of the anchor ring to form a clamp group with a circular tubular structure. One outer surface of the clamp is conical. The inner cavity of the clamp is provided with a threaded groove and a release groove in sequence along the direction from the narrow end to the wide end of the clamp. The release groove and the threaded groove are connected. A limiting groove is provided on the inner cavity of the clamp. The limiting groove is located on the groove wall of the release groove. An arc-shaped fixing piece is provided on the wide end of the clamp. The fixing piece and the clamp are an integral structure. A fixing groove is provided on the outer surface of the fixing piece. The fixing groove, the threaded groove, the release groove, the fixing piece, and the central axis of the clamp are all located on the same axis.

[0007] Preferably, the diameter of the release groove is not greater than the inner surface diameter of the fixing plate, and the bottom of the fixing plate is provided with an arc-shaped guide plate. The central axes of the guide plate and the fixing plate are located on the same axis. The guide plate and the fixing plate are an integral structure. The outer surface of the guide plate is in contact with the fixing plate, and the inner surface diameter of the guide plate gradually decreases along the direction from the fixing plate to the clamping plate.

[0008] Preferably, the clamping piece has a clamping groove on the side near the fixing piece, and the outer diameter of the fixing piece is not greater than the outer diameter of the wide end of the clamping piece.

[0009] Preferably, the wide end of the clamping piece and the end of the fixing piece away from the clamping piece are respectively provided with guide grooves. The guide grooves are provided on the outer surface of the fixing piece or the clamping piece, and the groove diameter gradually increases along the direction from the fixing piece to the clamping piece.

[0010] Preferably, the anchor ring has support grooves on both sides, extending from the top to the bottom of the anchor ring. A support block is provided on the support groove, with one side of the support block movably fitted into the support groove. The cross-sectional shape of one side of the support block matches the cross-sectional shape of the support groove. A through hole is provided on the other side of the support groove, and a screw is movably fitted into the through hole. The diameter of the through hole is not greater than the diameter of the screw nut.

[0011] Preferably, the anchor ring has constraint grooves on both sides, located in the upper middle part of the anchor ring. Two clamps are provided on the anchor ring, movably fitted onto both sides of the anchor ring. Bolts and nuts are provided on the sides of the two clamps, connecting them. Constraint blocks are provided on the inner surfaces of the clamps, movably fitted into the constraint grooves. A semi-circular ring-shaped fixing ring is provided at the end of the clamp furthest from the anchor ring, with its outer side installed on one end of the clamp. A disc-shaped limiting plate is provided between the fixing ring and the anchor ring, movably fitted into the clamp. The diameter of the limiting plate is not less than the inner diameter of the fixing ring. A through hole is provided on the limiting plate, with the diameter not greater than the wide end diameter of the clamp.

[0012] Preferably, each of the two clamps has a sleeve hole on both sides, which is fitted onto the bolt. The diameter of the sleeve hole is not greater than the diameter of the bolt nut or the outer diameter of the nut. A spring is fitted onto the bolt, and the two sides of the spring are in contact with the clamp and the nut, respectively.

[0013] The beneficial effects of this utility model are as follows: First, the threaded groove on the clamping plate facilitates the clamping and fixing of the steel strand passing through the inner side of the clamping plate. The release groove facilitates stress release, preventing stress concentration and damage to the clamping plate or steel strand. Furthermore, the clamping plate has a limiting groove in its inner cavity. By placing a sealing ring within the limiting groove, the gap between the outer side of the clamping plate assembly and the steel strand is sealed, preventing rainwater or dust from seeping in and reducing corrosion of the clamping plate's inner cavity. The fixing plate and its fixing groove on the clamping plate facilitate the use of a locking device to engage with the fixing groove. By pulling the locking device, the clamping plate assembly can be pulled out of the anchor ring, fulfilling the need for disassembly.

[0014] Secondly, this invention utilizes guide plates to facilitate the fitting of the sealing ring into the limiting groove for assembly. Clamping grooves on the clamping plates allow for the use of O-rings to limit the positioning of multiple clamping plates, forming a clamping plate assembly with a cylindrical structure. Furthermore, guide grooves on the clamping and fixing plates facilitate the interference fit of the O-ring into the clamping groove and the locking device into the fixing groove, simplifying O-ring assembly and clamping plate retraction.

[0015] Furthermore, this invention uses a support block, screws, and a support groove on the anchor ring to clamp the anchor ring onto the engineering structural member and constrain the rotation of the anchor ring, preventing it from rotating and thus avoiding unnecessary torque in the prestressed engineering. Moreover, this invention uses a clamp, constraint block, and fixing ring to install a limiting plate on one side of the anchor ring, allowing the through holes on the limiting plate to control the movement range of the clamping plate assembly. This facilitates the sliding of the clamping plate assembly on the steel strand to meet the needs of prestressed engineering. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the clip structure in this utility model.

[0018] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0019] Figure 4 This is an exploded view of the assembly of the anchor ring and clamp in this utility model.

[0020] Figure 5 This is an exploded view of the assembly of the two clamps and the limiting plate in this utility model.

[0021] Figure 6 This is a diagram showing the installation of the present invention with steel strands and anchor plates. Detailed Implementation

[0022] like Figures 1 to 5As shown, a clamp-type anchor includes an anchor ring 1 and at least two clamps 2 movably fitted inside the conical hole of the anchor ring 1, forming a cylindrical clamp group. One outer surface of each clamp 2 has a conical structure. The inner cavity of each clamp 2 has a threaded groove 3 and a release groove 4 sequentially formed along the direction from the narrow end to the wide end of the clamp 2. The release groove 4 and the threaded groove 3 are connected. A limiting groove 5 is formed on the inner cavity of each clamp 2, located on the groove wall of the release groove 4. An arc-shaped fixing piece 6 is provided on the wide end of each clamp 2, and the fixing piece 6 is an integral structure with the clamp 2. A fixing groove 7 is formed on the outer surface of the fixing piece 6. The fixing groove 7 and the threaded groove 3 are connected. The central axes of groove 3, release groove 4, fixing plate 6, and clamping plate 2 are all located on the same axis. By fitting a sealing ring inside the limiting groove 5, the sealing ring is interference-fitted onto the steel strand to seal the gap between the outer side of the clamping plate group and the steel strand, preventing rainwater or dust from seeping in from the gap between the outer side of the clamping plate group and the steel strand, thereby reducing corrosion of the inner cavity of clamping plate 2 and improving the performance of clamping plate 2. The fixing groove 7 is used to retrieve the clamping plate group. By using a locking device to snap into the fixing groove 7, the clamping plate group can be pulled out from the anchor ring 1 by pulling the locking device to meet the needs of retrieval of the clamping plate group.

[0023] In this embodiment, the diameter of the release groove 4 is not greater than the inner surface diameter of the fixing plate 6, so as to facilitate the sealing ring to pass through the fixing plate 6. The bottom of the fixing plate 6 is provided with an arc-shaped guide plate 8. The central axes of the guide plate 8 and the fixing plate 6 are located on the same axis. The guide plate 8 and the fixing plate 6 are an integral structure. The outer surface of the guide plate 8 is in contact with the fixing plate 6. The inner surface diameter of the guide plate 8 gradually decreases along the direction from the fixing plate 6 to the clamping plate 2, so as to facilitate guiding the sealing ring to be fitted into the limiting groove 5.

[0024] Specifically, the clamping piece 2 has a clamping groove 9 on the side near the fixing piece 6. An O-ring is interference-fitted into the clamping groove 9. The O-ring is used to limit the position of several clamping pieces 2, so that several clamping pieces 2 form the clamping piece group of the circular tubular structure. The outer diameter of the fixing piece 6 is not greater than the outer diameter of the wide end of the clamping piece 2, so as to avoid the O-ring being interference-fitted onto the fixing piece 6, thereby avoiding the fixing piece 6 from affecting the assembly of the O-ring.

[0025] Please refer to it again. Figure 2 and 3 The wide end of the clamping piece 2 and the end of the fixing piece 6 away from the clamping piece 2 are respectively provided with guide grooves 10. The guide grooves 10 are opened on the outer surface of the fixing piece 6 or the clamping piece 2. The groove diameter of the guide groove 10 gradually increases along the direction from the fixing piece 6 to the clamping piece 2, so as to facilitate the O-ring interference fit into the clamping groove 9 and guide the locking device to snap into the fixing groove 7, so as to facilitate the assembly of the O-ring and the recycling of the clamping piece 2.

[0026] Please refer to it again. Figure 1 , 4 In section 5, support grooves 11 are respectively provided on both sides of the anchor ring 1. The support grooves 11 extend from the top of the anchor ring 1 to the bottom of the anchor ring 1. A support block 12 is provided on the support groove 11. One side of the support block 12 is movably fitted into the support groove 11. The cross-sectional shape of one side of the support block 12 matches the cross-sectional shape of the support groove 11. A through hole is provided on the other side of the support groove 11. A screw 13 is movably fitted into the through hole. The diameter of the through hole is not greater than the diameter of the nut of the screw 13. The support block 12 is installed on the anchor plate or engineering structure component by the screw 13, thereby clamping the anchor ring 1 onto the engineering structure component and constraining the rotation of the anchor ring 1 to prevent the anchor ring 1 from rotating, that is, to avoid the prestressing project from generating excess torque.

[0027] Specifically, the anchor ring 1 has constraint grooves 14 on both sides, located in the upper middle part of the anchor ring 1. Two clamps 15 are provided on the anchor ring 1, movably fitted onto both sides of the anchor ring 1. Bolts 16 and nuts 17 are provided on the sides of the two clamps 15, connecting them via bolts 16 and nuts 17. Constraint blocks 18 are provided on the inner surfaces of the clamps 15, movably fitted into the constraint grooves 14. A semi-circular ring structure is provided at the end of the clamp 15 furthest from the anchor ring 1. The outer side of the fixed ring 19 is installed on one end of the clamp 15. A disc-shaped limiting plate 20 is provided between the fixed ring 19 and the anchor ring 1. The limiting plate 20 is movably fitted inside the clamp 15. The diameter of the limiting plate 20 is not less than the inner diameter of the fixed ring 19. A through hole 21 is provided on the limiting plate 20. The diameter of the through hole 21 is not greater than the diameter of the wide end of the clamp 2. Thus, the limiting plate 20 is installed on one side of the anchor ring 1, so that the movement range of the clamp group can be controlled by the limiting plate 20, thereby facilitating the sliding of the clamp group on the steel strand to meet the needs of prestressed engineering.

[0028] In this embodiment, the two clamps 15 are provided with sleeve holes on both sides. The sleeve holes are fitted onto the bolts 16. The diameter of the sleeve holes is not greater than the nut diameter or the outer diameter of the nut of the bolts 16. A spring 22 is fitted on the bolts 16. The two sides of the spring 22 are in contact with the clamps 15 and the nuts 17 respectively. By means of the elastic force of the spring 22, the clamps 15 are pushed to clamp onto the anchor ring 1, and the assembly between the two clamps 15 is buffered.

[0029] The method for assembling this product onto the anchor plate is as follows: (e.g.) Figures 1 to 6As shown, the procedure includes the following steps: First, several steel strands are passed through corrugated pipes installed within the engineering structure component. Anchor plates are then fitted onto the tensioning ends of the steel strands, ensuring that the anchor plates abut against the corrugated pipes embedded in the precast beam ducts. The anchor plates are then installed on the engineering structure component. Next, several steel strands are passed through the conical hole of the anchor ring 1, allowing the anchor ring 1 to be installed on the anchor plate. Then, one side of the support block 12 is fitted into the support groove 11, and a screw 13 is fitted onto the other side of the support block 12. The screw 13 is then installed on the anchor plate or engineering structure component to clamp the anchor ring 1 onto the engineering structure component, preventing rotation of the anchor ring 1 and thus avoiding excessive torque in the prestressed engineering. Next, several clamping pieces 2 are assembled into a tubular clamping piece group, and an O-ring is interference-fitted into the clamping groove 9 to fix one side of the clamping piece group. The clamping piece group is then fitted onto the steel strands, and using tools such as steel pipes, the clamping piece group is pushed into the conical hole of the anchor ring 1. Next, several steel strands are passed through the through holes 21 of the limiting plate 20. The limiting plate 20 and the anchor ring 1 are then wrapped inside two clamps 15, so that the constraint block 18 is fitted into the constraint groove 14. Bolts 16, nuts 117, and springs 22 are used to connect the two clamps 15 to limit the movement range of the clamp 2, facilitating the prestressing process. Finally, after the prestressing process is completed, the sealing ring is first fitted onto the steel strands, and then pushed into the limiting groove 5, so that the sealing ring is pressed into the limiting groove 5 to seal the gap between the clamp and the steel strands.

[0030] The method of assembling this product onto the jack is similar to that of assembling it onto the anchor plate, and therefore will not be described again. It should be noted that when removing this product from the steel strand, the tool anchor needs to be disassembled, and the tool anchor is mounted on the jack. Therefore, first remove the anchor ring 1 from the jack, then use the locking device to slip onto the steel strand, and lock it into the fixing groove 7. Pulling the locking device will then remove the clamping plate assembly from the anchor ring 1, thus fulfilling the need for disassembling the clamping plate assembly. After the clamping plate assembly is disassembled, remove the anchor ring 1 from the steel strand to complete the disassembly of this product.

[0031] In this embodiment, the threaded groove 3 on the clamping piece 2 facilitates the clamping and fixing of the steel strand passing through the inner side of the clamping piece 2. The release groove 4 helps to release stress and avoid stress concentration that could damage the clamping piece 2 or the steel strand. Furthermore, this embodiment uses a limiting groove 5 on the inner cavity of the clamping piece 2. By placing a sealing ring in the limiting groove 5, the gap between the outer side of the clamping piece assembly and the steel strand is sealed, thereby preventing rainwater or dust from seeping into the gap between the outer side of the clamping piece assembly and the steel strand, reducing corrosion of the inner cavity of the clamping piece 2. The fixing piece 6 on the clamping piece 2 and the fixing groove 7 on the fixing piece 6 facilitate the use of a locking device to snap into the fixing groove 7. By pulling the locking device, the clamping piece assembly can be pulled out from the anchor ring 1, satisfying the need for disassembling the clamping piece assembly.

[0032] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A clamp-type anchor, comprising an anchor ring (1) and at least two clamps (2) movably fitted within the conical hole of the anchor ring (1) forming a clamp assembly with a circular tubular structure, characterized in that: The outer surface of one side of the clamp (2) is conical. The inner cavity of the clamp (2) is provided with a threaded groove (3) and a release groove (4) in sequence from the narrow end to the wide end of the clamp (2). The release groove (4) and the threaded groove (3) are connected. A limiting groove (5) is provided on the inner cavity of the clamp (2). The limiting groove (5) is located on the groove wall of the release groove (4). An arc-shaped fixing piece (6) is provided on the wide end of the clamp (2). The fixing piece (6) and the clamp (2) are an integral structure. A fixing groove (7) is provided on the outer surface of the fixing piece (6). The fixing groove (7), the threaded groove (3), the release groove (4), the fixing piece (6), and the central axis of the clamp (2) are all located on the same axis.

2. The clamp-type anchorage according to claim 1, characterized in that: The groove diameter of the release groove (4) is not greater than the inner surface diameter of the fixing plate (6). The bottom of the fixing plate (6) is provided with an arc-shaped guide plate (8). The central axes of the guide plate (8) and the fixing plate (6) are located on the same axis. The guide plate (8) and the fixing plate (6) are an integral structure. The outer surface of the guide plate (8) is in contact with the fixing plate (6). The inner surface diameter of the guide plate (8) gradually decreases along the direction from the fixing plate (6) to the clamping plate (2).

3. The wedge-type anchorage according to claim 1, characterized in that: The clamping piece (2) has a clamping groove (9) on the side near the fixing piece (6), and the outer diameter of the fixing piece (6) is not greater than the outer diameter of the wide end of the clamping piece (2).

4. The clamp-type anchorage according to claim 1, characterized in that: The wide end of the clamping piece (2) and the end of the fixing piece (6) away from the clamping piece (2) are respectively provided with guide grooves (10). The guide grooves (10) are opened on the outer surface of the fixing piece (6) or the clamping piece (2). The groove diameter of the guide grooves (10) gradually increases along the direction from the fixing piece (6) to the clamping piece (2).

5. The wedge-type anchor according to claim 1, characterized in that: The anchor ring (1) has support grooves (11) on both sides. The support grooves (11) extend from the top of the anchor ring (1) to the bottom of the anchor ring (1). A support block (12) is provided on the support groove (11). One side of the support block (12) is movably fitted into the support groove (11). The cross-sectional shape of one side of the support block (12) matches the cross-sectional shape of the support groove (11). A through hole is provided on the other side of the support groove (11). A screw (13) is movably fitted into the through hole. The diameter of the through hole is not greater than the diameter of the nut of the screw (13).

6. The wedge-type anchor according to claim 1, characterized in that: The anchor ring (1) has constraint grooves (14) on both sides. The constraint grooves (14) are located in the upper middle part of the anchor ring (1). Two clamps (15) are provided on the anchor ring (1). The two clamps (15) are movably fitted on both sides of the anchor ring (1). Bolts (16) and nuts (17) are provided on the sides of the two clamps (15). The two clamps (15) are connected to the nuts (17) by the bolts (16). Constraint blocks (18) are provided on the two clamps (15). The constraint blocks (18) are installed on the inner side of the clamps (15). The movable set is in the constraint groove (14). A semi-circular ring structure fixing ring (19) is provided on the end of the clamp (15) away from the anchor ring (1). The outer side of the fixing ring (19) is installed on one end of the clamp (15). A disc-shaped limiting plate (20) is provided between the fixing ring (19) and the anchor ring (1). The limiting plate (20) is movable in the clamp (15). The diameter of the limiting plate (20) is not less than the inner diameter of the fixing ring (19). A through hole (21) is opened on the limiting plate (20). The diameter of the through hole (21) is not greater than the diameter of the wide end of the clamp (2).

7. The wedge-type anchor according to claim 6, characterized in that: The two clamps (15) are provided with sleeve holes on both sides, which are fitted onto the bolt (16). The diameter of the sleeve hole is not greater than the nut diameter or the outer diameter of the nut of the bolt (16). A spring (22) is fitted on the bolt (16), and the two sides of the spring (22) are in contact with the clamp (15) and the nut (17) respectively.

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