Rolling low-friction deflector

Abstract

The utility model discloses a kind of rolling low friction deflector, belong to prestressed variable angle tensioning device technical field, solve the problem that the friction between steel strand and deflector in existing deflector is sliding friction, friction resistance is big, leading to the problem of big friction loss. It includes at least one fan-shaped steel plate, at least one layer of guiding structure is arranged on the steel plate along its radial direction, each layer of guiding structure includes multiple rollers, multiple rollers corresponding to each layer of guiding structure are distributed in the circumferential arc line of steel plate, each roller is rotatably connected with the steel plate. The rolling low friction deflector of the utility model can greatly reduce the friction resistance of prestressed tensioning, reduce engineering cost.

Description

Technical Field

[0001] This utility model relates to the technical field of prestressed variable angle tensioning devices, and more specifically, it relates to a rolling low-friction deflector. Background Technology

[0002] Currently, in the field of prestressed deflection tensioning, because the tensioning space is insufficient to accommodate the tensioning device, it is usually necessary to add a deflector device between the jack and the working anchor plate to deflect the steel strand to the side with more space to install the tensioning device, so as to achieve the effect of tensioning the prestressed tendons.

[0003] Existing deflectors, such as those disclosed in announcement numbers CN221399886U and CN202324652U, are all sliding type. That is, the friction between the steel strand and the deflector is sliding friction, which results in high frictional resistance and high frictional loss, reaching 7% to 10%. This means that the prestress actually transferred to the concrete by the deflection tension is much smaller than the tension control force, and the prestressing tendon cannot be fully utilized. Moreover, because of the high frictional resistance, the deflection angle is also limited, which requires a larger tensioning space to install the deflection device, affecting the stability and aesthetics of the structure itself. The steel strand must be cut longer, increasing the project cost.

[0004] Therefore, there is an urgent need to design a rolling low-friction deflector to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the existing technology. The purpose of this utility model is to provide a rolling low-friction deflector that can greatly reduce the frictional resistance of prestressing tension and reduce engineering costs.

[0006] To achieve the above objectives, this utility model provides a rolling low-friction deflector, comprising at least one fan-shaped steel plate, wherein at least one layer of guide structure is provided on the steel plate along its radial direction, each layer of guide structure includes multiple rollers, and the multiple rollers corresponding to each layer of guide structure are distributed in an arc along the circumference of the steel plate, and each roller is rotatably connected to the steel plate.

[0007] As a further improvement, the steel plate is a single piece, and guide structures are provided on both sides of the steel plate.

[0008] Furthermore, the steel plate consists of multiple pieces arranged in parallel, with a guide structure between adjacent steel plates, and adjacent steel plates are connected by connectors.

[0009] Furthermore, the connector includes a plurality of fastening bolts, each of which is located on one side of the roller.

[0010] Furthermore, the connector includes two positioning plates, which are respectively fixed to both ends of the steel plate, and each positioning plate below the guide structure has a through hole.

[0011] Furthermore, the center position of the arc formed by the roller connection line corresponding to each layer of the guide structure is the same as the center position of the sector of the steel plate.

[0012] Furthermore, the roller end is provided with a stepped shaft, the steel plate is provided with a bearing hole, the stepped shaft is installed in the bearing hole by a rolling bearing, and the outer surface of each roller is provided with a U-shaped groove that matches the steel strand.

[0013] Furthermore, each layer of the guide structure also includes an annular track groove, which is opened on the side of two adjacent steel plates on opposite sides. The annular track groove corresponding to each layer of the guide structure is distributed in an arc along the circumference of the steel plate. Rollers are laid between the annular track grooves corresponding to two adjacent steel plates along their extension direction, and both ends of each roller are movably inserted into the annular track groove.

[0014] Furthermore, each of the annular track grooves has an opening groove on one side of the steel plate extending to the end face of the steel plate, and a plug is detachably installed in the opening groove.

[0015] Furthermore, grooves are provided on the opposite sides of two adjacent steel plates, and a track plate can be detachably installed on each groove. The outer wall of the track plate and the inner wall of the groove form the annular track groove.

[0016] Beneficial effects

[0017] Compared with the prior art, the advantages of this utility model are as follows:

[0018] This utility model's rolling low-friction deflector uses a rotatable roller to contact the prestressing tendon. During tensioning, the prestressing tendon is evenly pressed onto the roller, causing it to rotate and resulting in rolling friction between the tendon and the roller. This significantly reduces the frictional resistance during prestressing tensioning. Tests show that the frictional resistance is reduced from the traditional 10% to less than 3%, solving the technical problem of high frictional resistance in prestressed construction. It fully utilizes the mechanical properties of the prestressing tendon, reduces the tensioning allowance, increases structural stability and aesthetics, reduces the amount of prestressing tendon used, and greatly lowers project costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of this utility model;

[0020] Figure 2This is a side view of Embodiment 1 of the present invention.

[0021] Figure 3 This is an enlarged schematic diagram of the roller structure in Embodiment 1 of this utility model;

[0022] Figure 4 This is a schematic diagram of the main structure of Embodiment 2 of this utility model;

[0023] Figure 5 This is a side view of Embodiment 2 of the present invention.

[0024] Figure 6 This is a schematic diagram of the main structure of Embodiment 3 of this utility model;

[0025] Figure 7 This is a schematic diagram of the main structure of Embodiment 4 of this utility model;

[0026] Figure 8 for Figure 7 A magnified schematic diagram of the structure of AA.

[0027] Wherein: 1-steel plate, 2-roller, 3-fastening bolt, 4-positioning plate, 5-through hole, 6-annular track groove, 7-track plate, 8-plug, 201-stepped shaft, 202-U-shaped groove. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0029] Example 1

[0030] See Figure 1-3 This is a specific embodiment of the present invention. The rolling low-friction deflector in this embodiment includes at least one fan-shaped steel plate 1. At least one layer of guide structures is arranged on the steel plate 1 along its radial direction. During construction, the prestressed tendon strands are threaded between adjacent layers of guide structures. Each guide structure includes multiple rollers 2, with the number of rollers n = 2 to 200. The multiple rollers 2 corresponding to each guide structure are distributed in an arc along the circumference of the steel plate 1. Each roller 2 is rotatably connected to the steel plate 1, forming a rolling friction mechanism. In this embodiment, the steel plate 1 is a single piece, and guide structures are provided on both sides of the steel plate 1, allowing the steel strands to be guided from both sides of the steel plate 1. This results in a simpler structure and easier manufacturing.

[0031] Preferably, the center of the arc formed by the connecting lines of the rollers 2 corresponding to each layer of guide structure is the same as the center of the fan-shaped circle of the steel plate 1, so that the rollers 2 corresponding to each layer of guide structure are subjected to uniform force, further extending the service life of the steel plate 1.

[0032] Preferably, a stepped shaft 201 is provided at the end of the roller 2, and a bearing hole is provided on the steel plate 1. The stepped shaft 201 is installed in the bearing hole through a rolling bearing to realize the rotational connection of the roller 2. The use of a rolling bearing to install the roller 2 reduces the friction between the roller and the steel plate, making the rotation smoother and more stable. Each roller 2 has a U-shaped groove 202 that matches the steel strand on its outer surface to fix the steel strand in the middle of the roller. During tensioning, the prestressing tendon is always in the middle of the U-groove.

[0033] Example 2

[0034] See Figure 4-5 This is another specific embodiment of the present utility model. This embodiment is basically the same as embodiment 1, except that the steel plate 1 is made of multiple pieces, which are arranged in parallel. A guide structure is provided between two adjacent steel plates 1, and two adjacent steel plates 1 are connected by a connector.

[0035] In this embodiment, the number of steel plates 1 and rollers 2 can be increased according to the arrangement of the prestressing tendons, and multiple rows of rollers 2 can be set up, which makes it more versatile. Moreover, the steel strands of the prestressing tendons are threaded between the two steel plates 1, which can avoid the safety hazard caused by the steel strands detaching from the rollers 2.

[0036] Preferably, the connector includes multiple fastening bolts 3, each of which is located on one side of the roller 2, to avoid interference between the fastening bolts 3 and the steel strands. The fastening bolts 3 connect adjacent steel plates 1, making assembly and disassembly more convenient and further improving construction efficiency.

[0037] Preferably, steel plate 1 can be composed of at least two sections of arc-shaped plates spliced ​​together, with each section having a deflection angle between 15 and 30°. The deflector can be assembled according to the actual deflection angle during tensioning, making it more convenient to use. Furthermore, a stop and a groove are provided between adjacent sections to facilitate docking. After the adjacent sections are docked, they can be fastened with bolts.

[0038] Example 3

[0039] See Figure 6 This is another specific embodiment of the present invention. This embodiment is basically the same as embodiment 2, except that the connecting component includes two positioning plates 4, which are respectively fixed to both ends of the steel plate 1. Specifically, the positioning plates 4 can be fixed to the steel plate 1 by bolts, and each positioning plate 4 below the guide structure has a through hole 5 to allow the steel strand to pass smoothly through the positioning plate. In this embodiment, positioning plates 4 are used to connect multiple steel plates 1, making disassembly and assembly more convenient. At the same time, the setting of the positioning plates 4 can facilitate the connection of the deflector with other construction components.

[0040] Example 4

[0041] See Figure 7-8 In another specific embodiment of this utility model, each layer of guide structure further includes an annular track groove 6. The annular track groove 6 is opened on the side of the opposite side of two adjacent steel plates 1, and the annular track groove 6 corresponding to each layer of guide structure is distributed in an arc along the circumference of the steel plate 1. The roller 2 is cylindrical, and the annular track groove 6 corresponding to two adjacent steel plates 1 is filled with roller 2 along its extension direction. Both ends of each roller 2 are movably inserted into the annular track groove 6, so that the roller 2 can rotate relative to the steel plate 1 and slide along the annular track groove 6.

[0042] In this embodiment, the rollers 2 are evenly distributed along the annular track groove 6, so that the annular track groove 6 is evenly filled with rollers 2, resulting in a larger contact area with the steel strand and better guiding performance. Moreover, when the deflector is installed, the steel strand is not yet bent and may generate rolling friction with the rollers at the bottom of the channel, reducing friction and greatly reducing the installation difficulty.

[0043] In this embodiment, the center of the arc of the annular track groove 6 is the same as the center of the fan-shaped circle of the steel plate 1, so that the rollers 2 corresponding to each layer of guide structure are subjected to uniform force, further extending the service life of the steel plate 1.

[0044] In this embodiment, each annular track groove 6 has an opening groove on one side of the steel plate 1 extending to the end face of the steel plate 1. The opening groove connects the annular track groove 6 with the end face of the steel plate 1, making it convenient to install the roller 2 into the annular track groove 6 through the opening groove, which makes the roller installation more convenient. At the same time, oil can be injected into the annular track groove 6 through the opening groove to lubricate the roller 2, making it more convenient to use. A plug 8 is detachably installed in the opening groove. The plug 8 can be installed by threaded connection or bolt connection, which can prevent the roller 2 from slipping out.

[0045] In this embodiment, grooves are provided on the opposite sides of two adjacent steel plates 1. A track plate 7 can be detachably installed on each groove. Specifically, the track plate 7 can be installed on the steel plate 1 by countersunk screws. The outer wall of the track plate 7 and the inner wall of the groove form the annular track groove 6, which facilitates the disassembly and replacement of track plates 7 of different widths, thereby installing rollers of different diameters to accommodate steel strands of different diameters.

[0046] In this embodiment, the multiple steel plates 1 are also connected together by positioning plates 4 or fastening bolts 3, and a segmented splicing structure can also be adopted, which will not be described in detail here.

[0047] This utility model's rolling low-friction deflector uses a rotatable roller to contact the prestressing tendon. During tensioning, the prestressing tendon is evenly pressed onto the roller, causing it to rotate and resulting in rolling friction between the tendon and the roller. This significantly reduces the frictional resistance during prestressing tensioning. Tests show that the frictional resistance is reduced from the traditional 10% to less than 3%, solving the technical problem of high frictional resistance in prestressed construction. It fully utilizes the mechanical properties of the prestressing tendon, reduces the tensioning allowance, increases structural stability and aesthetics, reduces the amount of prestressing tendon used, and greatly lowers project costs.

[0048] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. A rolling low-friction deflector, characterized in that, It includes at least one fan-shaped steel plate (1), and at least one layer of guide structure is provided on the steel plate (1) along its radial direction. Each layer of guide structure includes multiple rollers (2). The multiple rollers (2) corresponding to each layer of guide structure are distributed in an arc along the circumference of the steel plate (1). Each roller (2) is rotatably connected to the steel plate (1).

2. The rolling low-friction deflector according to claim 1, characterized in that, The steel plate (1) is a single piece, and guide structures are provided on both sides of the steel plate (1).

3. The rolling low-friction deflector according to claim 1, characterized in that, The steel plate (1) consists of multiple pieces, which are arranged in parallel. A guide structure is provided between two adjacent steel plates (1), and the two adjacent steel plates (1) are connected by connectors.

4. The rolling low-friction deflector according to claim 3, characterized in that, The connector includes a plurality of fastening bolts (3), each of which is located on one side of the roller (2).

5. The rolling low-friction deflector according to claim 3, characterized in that, The connector includes two positioning plates (4), which are fixed to both ends of the steel plate (1), and each positioning plate (4) below the guide structure has a through hole (5).

6. The rolling low-friction deflector according to any one of claims 1-5, characterized in that, The center of the arc formed by the connecting lines of the rollers (2) corresponding to each layer of the guide structure is the same as the center of the fan-shaped circle of the steel plate (1).

7. The rolling low-friction deflector according to claim 6, characterized in that, The roller (2) is provided with a stepped shaft (201) at its end. The steel plate (1) is provided with a bearing hole. The stepped shaft (201) is installed in the bearing hole by a rolling bearing. The outer surface of each roller (2) is provided with a U-shaped groove (202) that matches the steel strand.

8. The rolling low-friction deflector according to any one of claims 3-5, characterized in that, Each layer of the guide structure also includes an annular track groove (6). The annular track groove (6) is opened on the side of the opposite side of two adjacent steel plates (1). The annular track groove (6) corresponding to each layer of the guide structure is distributed in an arc along the circumference of the steel plate (1). Rollers (2) are laid between the annular track grooves (6) corresponding to two adjacent steel plates (1) along their extension direction. Both ends of each roller (2) are movably inserted into the annular track groove (6).

9. The rolling low-friction deflector according to claim 8, characterized in that, Each of the annular track grooves (6) has an opening groove on one side of the steel plate (1) that extends to the end face of the steel plate (1), and a plug (8) is detachably installed in the opening groove.

10. The rolling low-friction deflector according to claim 8, characterized in that, Grooves are provided on the opposite sides of two adjacent steel plates (1), and a track plate (7) can be detachably installed on each groove. The outer wall of the track plate (7) and the inner wall of the groove form the annular track groove (6).

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