Fixing device for anchoring end of steel strand

Abstract

The utility model discloses a fixing device for an anchoring end of a steel strand, belongs to the technical field of steel strands, and solves the problems of low construction efficiency and high cost caused by bolt connection of an extrusion sleeve and a bottom support on the anchoring end of the steel strand in the prior art. The device comprises an extruding machine, a limiting plate is fixed on the extruding machine, and a movable cushion block, a bottom support and an extruding sleeve are arranged between the limiting plate and the extruding machine. Through the interference fit of the bottom support and the extrusion sleeve, the anchoring end extrusion sleeve and the bottom support are more tightly attached, the structure is firmer, the stability is higher, the manufacturing is easier, concrete cracking and tensioning force loss at the anchoring end during tensioning can be greatly reduced, the construction quality of prestress engineering is improved, certain potential safety hazards are avoided, and the construction efficiency is improved. And compared with bolt connection between the extrusion sleeve and the bottom support in the prior art, the construction efficiency is improved, and the construction cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel strand technology, and specifically to a fixing device for the anchoring end of a steel strand. Background Technology

[0002] Steel strands play a crucial role in prestressed technology. Prestressing technology improves a structure's crack resistance, seismic resistance, and deflection resistance by introducing pre-applied stress into the structure. Steel strands are a commonly used material in prestressed structures; they are composed of multiple strands of steel wire twisted together, possessing high strength and good ductility, and can withstand large tensile forces. The prestressed anchorage end refers to the structure used to fix the steel strands during prestressing tensioning, including the base support and compression sleeve fixedly connected to the steel strands. The anchorage end bears very large tensile forces during tensioning. If the anchorage end is not properly secured, the concrete at the anchorage end is prone to cracking during tensioning, causing material damage and loss of tension force, and in severe cases, injury to operators.

[0003] To solve the above problems, the existing technology first extrudes the extrusion sleeve onto the steel strand using an extrusion press, and then uses fixing screws to fix the base to the extrusion sleeve. This solution is complicated and time-consuming to construct, and the cost of processing the base with screws is high. Utility Model Content

[0004] To address the aforementioned problems in the prior art, this utility model provides a fixing device for the anchoring end of steel strands, which solves the problem of low construction efficiency and high cost caused by the bolt connection between the compression sleeve and the base at the anchoring end of the steel strand.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A fixing device for anchoring the end of a steel strand is provided, including an extrusion press, a limit plate fixed on the extrusion press, and a movable pad, a base support, and an extrusion sleeve disposed between the limit plate and the extrusion press. The limit plate and the movable pad are respectively provided with a first through groove and a second through groove. The middle part of the base support is provided with a through hole for the steel strand to pass through and a fixing cylinder for interference fit with the extrusion sleeve. One end of the steel strand passes through the first through groove, the second through groove, and the through hole in sequence and enters the extrusion sleeve. The extrusion sleeve is located between the push rod and the extrusion die on the extrusion press.

[0007] The working principle of this scheme is as follows: The push rod of the extrusion press drives the extrusion sleeve into the extrusion die. Because the inner diameter of the extrusion die is smaller than the outer diameter of the extrusion sleeve, the extrusion die compresses the sleeve, fixing it to the steel strand. The push rod continues to press forward, bringing the extrusion sleeve into contact with the fixed cylinder of the base support. Under the displacement restriction of the movable pad and the limiting plate, the push rod forces the extrusion sleeve into the interior of the fixed cylinder, thus fixing the extrusion sleeve and the base support into a single unit. Finally, the movable pad is removed, completing the prestressed anchorage of the steel strand. This process allows for a tighter fit between the anchorage end extrusion sleeve and the base support, resulting in a more robust structure, greater stability, and simpler fabrication. It significantly reduces concrete cracking at the anchorage end and tension loss during tensioning, improves the construction quality of prestressed engineering, avoids certain safety hazards, and, compared to the bolted connection between the extrusion sleeve and the base support in existing technologies, improves construction efficiency and reduces construction costs.

[0008] Furthermore, the four corners of the limiting plate are welded to the outer wall of the extrusion die with reinforcing bars. The reinforcing bars are welded to fix the limiting plate and the extrusion die, resulting in a simple structure that is easy to directly connect to existing extrusion presses.

[0009] Furthermore, the first and second through slots are two U-shaped slots with their openings facing each other. The semi-circular holes on the two U-shaped slots can form a circular hole, which facilitates the limiting of the steel strand.

[0010] Furthermore, a lifting handle is provided on the top of the movable pad. The lifting handle makes it easy for workers to lift and move the movable pad upwards.

[0011] Furthermore, four reinforcing ribs are welded around the outer wall of the fixed cylinder to the end face of the base. The four reinforcing ribs welded to the outer wall of the fixed cylinder significantly enhance the axial compressive strength of the base and prevent the fixed cylinder from deforming or cracking during interference fit.

[0012] Furthermore, the inner wall of the fixed cylinder is evenly provided with multiple flanges for extruding and contacting the steel strand. The flanges allow the extrusion sleeve to deform and make an interference fit with the fixed cylinder.

[0013] Furthermore, the distance between the limiting plate and the end face of the extrusion sleeve is greater than the sum of the lengths of the movable pad, the base, and the extrusion sleeve. This redundant design of the distance between the limiting plate and the end face of the extrusion sleeve provides sufficient space for the installation of the movable pad, the base, and the extrusion sleeve.

[0014] This utility model discloses a fixing device for the anchoring end of a steel strand, the advantages of which are:

[0015] This invention, through the interference fit between the base support and the extrusion sleeve, allows the anchor end extrusion sleeve and the base support to fit more tightly, resulting in a more robust structure, improving the construction quality of prestressed engineering, avoiding certain safety hazards, and compared with the bolted connection between the extrusion sleeve and the base support in the prior art, this invention improves construction efficiency and reduces construction costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixing device;

[0017] Figure 2 This is a front view of the limiting plate;

[0018] Figure 3 This is a front view of the movable pad.

[0019] Figure 4 This is a front view of the base.

[0020] The components are: 1. Extrusion press; 11. Extrusion die; 12. Top rod; 2. Limiting plate; 21. Reinforcing bar; 22. First through groove; 3. Movable pad; 31. Second through groove; 32. Lifting handle; 4. Base support; 41. Through hole; 42. Fixed cylinder; 43. Flange; 44. Reinforcing rib; 5. Extrusion sleeve; 6. Steel strand. Detailed Implementation

[0021] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0022] This embodiment provides a fixing device for the anchoring end of steel strand, which solves the problem of low construction efficiency and high cost caused by the bolt connection between the extrusion sleeve and the bottom support on the anchoring end of steel strand in the prior art. It is shown in detail below.

[0023] refer to Figure 1 A fixing device for anchoring the end of a steel strand includes an extruder 1 and a limiting plate 2, with a movable pad 3, a base support 4 and an extrusion sleeve 5 disposed between the limiting plate 2 and the extruder 1.

[0024] Specifically, the four corners of the limiting plate 2 are welded to the outer wall of the extrusion die 11 by steel bars 21. The steel bars 21 are welded to fix the limiting plate 2 and the extrusion die 11, which is simple in structure and convenient to be directly fixedly connected to the existing extrusion machine 1.

[0025] The distance between the end face of the limiting plate 2 and the end face of the extrusion sleeve 5 is greater than the sum of the lengths of the movable pad 3, the base 4, and the extrusion sleeve 5. The redundant design of the distance between the end faces of the limiting plate 2 and the extrusion sleeve 5 provides sufficient space for the installation of the movable pad 3, the base 4, and the extrusion sleeve 5.

[0026] For details, please refer to Figure 2 and Figure 3 The limiting plate 2 and the movable pad 3 are respectively provided with a first through groove 22 and a second through groove 31. The first through groove 22 and the second through groove 31 are two U-shaped grooves with their openings facing each other. The semi-circular holes on the two U-shaped grooves can form a round hole, which facilitates the limiting of the steel strand 6. In addition, the top of the movable pad 3 is provided with a lifting handle 32. The lifting handle 32 is provided so that the worker can easily lift and move the movable pad 3 upwards.

[0027] For details, please refer to Figure 4 The base support 4 has a through hole 41 for the steel strand to pass through and a fixed cylinder 42 for interference fit with the extrusion sleeve 5 in the middle. Four reinforcing ribs 44 are welded to the outer wall of the fixed cylinder 42 and located on the end face of the base support 4. The four reinforcing ribs 44 are welded to the outer wall of the fixed cylinder 42, which significantly enhances the axial compressive strength of the base support 4 and prevents the fixed cylinder 42 from deforming or cracking when interference fit is applied.

[0028] To achieve an interference fit between the fixed cylinder 42 and the extrusion sleeve 5, multiple flanges 43 are evenly arranged on the inner wall of the fixed cylinder 42 for extrusion contact with the steel strand 6. The flanges 43 allow the extrusion sleeve 5 to deform and achieve an interference fit with the fixed cylinder 42.

[0029] Specifically, one end of the steel strand 6 passes sequentially through the first through groove 22, the second through groove 31, and the through hole 41 and enters the extrusion sleeve 5. In this embodiment, the extruder 1 is a prior art technology, including a push rod 12 and an extrusion die 11, and the extrusion sleeve 5 is located between the push rod 12 and the extrusion die 11 on the extruder 1.

[0030] In summary, the working principle of this scheme is as follows: the push rod 12 of the extruder 1 drives the extrusion sleeve 5 to be squeezed into the extrusion die 11. Because the inner diameter of the extrusion die 11 is smaller than the outer diameter of the extrusion sleeve 5, the extrusion sleeve 5 is squeezed into a thinner shape by the extrusion die 11 and then fixed on the steel strand 6. The push rod 12 continues to squeeze forward, bringing the extrusion sleeve 5 into contact with the fixed cylinder 42 of the base support 4. Under the displacement restriction of the movable pad 3 and the limiting plate 2, the push rod 12 squeezes the extrusion sleeve 5 into the interior of the fixed cylinder 42, thereby fixing the extrusion sleeve 5 and the base support 4 into a whole. Finally, the movable pad 3 is removed to complete the prestressed anchoring of the steel strand 6.

[0031] This solution allows the anchor end compression sleeve 5 and the base support 4 to fit more tightly, resulting in a more robust structure, greater stability, and simpler manufacturing. It can significantly reduce concrete cracking at the anchor end and tension loss during tensioning, improve the construction quality of prestressed engineering, avoid certain safety hazards, and compared with the bolted connection between the compression sleeve 5 and the base support 4 in the existing technology, this solution improves construction efficiency and reduces construction costs.

[0032] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A fixing device for the anchoring end of a steel strand, characterized in that, The device includes an extruder (1), a limiting plate (2) fixed on the extruder (1), a movable pad (3), a base (4) and an extrusion sleeve (5) provided between the limiting plate (2) and the extruder (1); the limiting plate (2) and the movable pad (3) are respectively provided with a first through groove (22) and a second through groove (31); the base (4) is provided with a through hole (41) for steel strand to pass through and a fixed cylinder (42) for interference fit with the extrusion sleeve (5) in the middle; one end of the steel strand (6) passes through the first through groove (22), the second through groove (31) and the through hole (41) in sequence and enters the extrusion sleeve (5); the extrusion sleeve (5) is located between the top rod (12) and the extrusion die (11) on the extruder (1).

2. The fixing device for anchoring the end of a steel strand according to claim 1, characterized in that, The four corners of the limiting plate (2) are all welded to the outer wall of the extrusion mold (11) by steel bars (21).

3. The fixing device for anchoring the end of a steel strand according to claim 1, characterized in that, The first through groove (22) and the second through groove (31) are two U-shaped grooves with their openings facing each other.

4. The fixing device for anchoring the end of a steel strand according to claim 1, characterized in that, The top of the movable pad (3) is provided with a lifting handle (32).

5. The fixing device for anchoring the end of a steel strand according to claim 1, characterized in that, The outer wall of the fixed cylinder (42) is welded with four reinforcing ribs (44) located on the end face of the base (4).

6. The fixing device for anchoring the end of a steel strand according to claim 1, characterized in that, The inner wall of the fixed cylinder (42) is uniformly provided with a plurality of flanges (43) for extruding contact with the steel strand (6).

7. The fixing device for anchoring the end of a steel strand according to claim 1, characterized in that, The distance between the limiting plate (2) and the end face of the extrusion sleeve (5) is greater than the sum of the lengths of the movable pad (3), the base (4), and the extrusion sleeve (5).

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