Low-retraction structure of prestressed anchorage device

Abstract

The utility model discloses a low retraction structure of prestressed anchorage device, including anchor disc, the anchorage device main part of being sleeved on the surface of anchor disc, the limit board of being sleeved on the surface of anchor disc and being located the one side of anchorage device main part, and including the low retraction subassembly of being sleeved on the surface of anchor disc and being located the one end of being away from limit board, the anchor disc includes prestressed pipeline, the spiral muscle of being wound on the surface of prestressed pipeline, the anchor backing plate of being located the one end of prestressed pipeline and the steel strand of being located the inside of prestressed pipeline, anchor backing plate, the steel strand is seven groups, the anchorage device main part includes first anchor plate, still includes the first anchor clamping piece of being located the inside of first anchor plate, the first anchor clamping piece is seven groups, the first anchor plate is sleeved on the surface of steel strand, and steel strand is respectively embedded in the inside of first anchor clamping piece, the limit board is sleeved on the surface of steel strand. The low retraction structure of prestressed anchorage device in the utility model discloses can further fix steel strand to reduce the retraction amount.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchors, and in particular to a low-retraction structure for a prestressed anchor. Background Technology

[0002] Prestressed anchorages are permanent anchoring devices used in prestressed concrete. They are anchoring tools used in tensioned structures or components to maintain the tension of prestressing tendons and transfer it into the concrete. There are various types of prestressed anchorages. For example, tensioning end anchorages are installed at the ends of prestressing tendons and maintain the anchorage of the prestressing tendons throughout the tensioning process. Common types include wedge-type anchorages for tensioning prestressed steel strands, steel tapered anchors for tensioning high-strength steel wires, upsetting anchors for upsetting high-strength steel wires, nuts for tensioning finely rolled threaded steel bars, and cold-cast upsetting anchors for tensioning multi-strand parallel steel wire bundles. When using prestressed anchors, tensioning is achieved by using jacks to move the steel strands outward. Once the steel strands are pulled to the set tension by the jacks, the pressure is released, and the steel strands will retract inward. Anchoring the steel strands with short conical clamps helps to reduce the amount of retraction, but the steel strands will still retract inward, resulting in poor anchoring efficiency. Therefore, we propose a low-retraction structure for prestressed anchors. Utility Model Content

[0003] The main objective of this invention is to provide a low-retraction structure for prestressed anchorages, which can effectively solve the problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A low-retraction structure for a prestressed anchor includes an anchor plate, an anchor body fitted on the surface of the anchor plate, a limiting plate fitted on the surface of the anchor plate and located on one side of the anchor body, and a low-retraction component fitted on the surface of the anchor plate and located at the end away from the limiting plate.

[0005] Furthermore, the anchor plate includes a prestressed duct, a spiral bar wound on the surface of the prestressed duct, an anchor plate at one end of the prestressed duct, and steel strands inside the prestressed duct and the anchor plate, wherein the steel strands are in seven groups.

[0006] Furthermore, the anchor body includes a first anchor plate and a first anchor clamp disposed inside the first anchor plate, wherein there are seven sets of the first anchor clamp.

[0007] Furthermore, the first anchor plate is sleeved on the surface of the steel strand, and the steel strand is respectively embedded inside the first anchor clamp. The limiting plate is sleeved on the surface of the steel strand and is located on one side of the first anchor plate.

[0008] Furthermore, the low-retraction assembly includes a second anchor plate, a second anchor clip located on one side inside the second anchor plate (seven sets of the second anchor clip), a first gasket located on one side inside the second anchor plate (seven sets of the first gasket), and springs respectively located on one side of the first gaskets and second gaskets respectively located on one side of the springs.

[0009] Furthermore, the first washer, the spring, the second washer, and the second anchor clamp are all sleeved on the surface of the steel strand, and the second anchor plate is located on the surface of the steel strand on the side away from the limiting plate.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are: 1. By setting the first anchor clamp and the second anchor clamp, the steel strand can be limited and fixed, so that the steel strand can only move to one side, thereby reducing the amount of steel strand retraction. 2. By using the first washer, spring, and second washer, the spring can be compressed and store energy when the steel strand retracts, offsetting part of the retraction displacement and thus reducing stress loss. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a detailed drawing of the anchor plate of this utility model; Figure 3 This is a cross-sectional view of the second anchor plate of this utility model; Figure 4 Here is a detailed drawing of the low-retraction component of this utility model; Figure 5 For the present utility model Figure 2 A magnified view of the details at point A.

[0012] In the diagram: 1. Anchor plate; 101. Prestressed duct; 102. Spiral reinforcement; 103. Anchor plate; 104. Steel strand; 2. Anchor body; 201. First anchor plate; 202. First anchor wedge; 3. Limiting plate; 4. Low retraction assembly; 401. Second anchor plate; 402. First gasket; 403. Second anchor wedge; 404. Spring; 405. Second gasket. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] Reference Figure 1-5 A low-retraction structure for a prestressed anchor includes an anchor plate 1, an anchor body 2 fitted on the surface of the anchor plate 1, a limiting plate 3 fitted on the surface of the anchor plate 1 and located on one side of the anchor body 2, and a low-retraction component 4 fitted on the surface of the anchor plate 1 and located at the end away from the limiting plate 3. During tensioning, the limiting plate 3 can restrict the displacement of the first anchor clip 202. Specifically, by fitting the anchor body 2 onto one side of the anchor plate 1 and fixing the position of the anchor body 2 with the limiting plate 3, inserting the anchor plate 1 into the jack and fixing it with the low retraction component 4, the tensioning operation can be carried out.

[0015] In a preferred embodiment, the anchor plate 1 includes a prestressed duct 101, a spiral bar 102 wound on the surface of the prestressed duct 101, an anchor plate 103 disposed at one end of the prestressed duct 101, and steel strands 104 disposed inside the prestressed duct 101 and the anchor plate 103, wherein there are seven sets of steel strands 104. Specifically, the steel strand 104 is inserted into the prestressed duct 101 and the anchor plate 103. The end of the steel strand 104 is anchored by the prestressed duct 101, and the anchor plate 103 is used to anchor the end of the steel strand 104. The steel strand 104 is inserted into the prestressed duct 101 and is made of multiple thin steel wires twisted together, generally seven strands per group.

[0016] In a preferred embodiment, the anchor body 2 includes a first anchor plate 201 and a first anchor clip 202 disposed inside the first anchor plate 201, wherein there are seven sets of the first anchor clip 202; Specifically, the steel strand 104 is fixed by embedding the first anchor clip 202 into the interior of the first anchor plate 201. The first anchor plate 201 is made of steel alloy, which is very hard. The first anchor clip 202 is conical and is embedded in the anchor hole, so that the steel strand 104 can only move outward and will be firmly clamped when it moves inward.

[0017] In a preferred embodiment, the first anchor plate 201 is sleeved on the surface of the steel strand 104, and the steel strand 104 is respectively embedded in the interior of the first anchor clamp 202. The limiting plate 3 is sleeved on the surface of the steel strand 104 and is located on one side of the first anchor plate 201. Specifically, by inserting the steel strand 104 into the interior of the first anchor clamp 202, and having the limiting plate 3 fitted on the surface of the steel strand 104 and located on one side of the first anchor plate 201, the displacement of the first anchor clamp 202 is restricted.

[0018] In a preferred embodiment, the low-retraction component 4 includes a second anchor plate 401, a second anchor clip 403 disposed inside the second anchor plate 401 on one side, the second anchor clip 403 being seven sets, and a first gasket 402 disposed inside the second anchor plate 401 on one side of the second anchor clip 403, the first gasket 402 being seven sets, and a spring 404 disposed on one side of the first gasket 402 and a second gasket 405 disposed on one side of the spring 404. Specifically, by placing the first washer 402, spring 404, and second washer 405 inside the anchor hole on the second anchor plate 401, the second anchor clamp 403 can be further pushed, thereby reducing the amount of retraction of the second anchor clamp 403. The material of the second anchor plate 401 is the same as that of the first anchor plate 201, which is steel alloy. The first washer 402 is fixed inside the anchor hole on the second anchor plate 401 and is located on one side. It is connected to the second washer 405 through the spring 404. Under the pushing action of the spring 404, the second washer 405 will generate a force to move to one side. The function of the second anchor clamp 403 is the same as that of the first anchor clamp 202.

[0019] In a preferred embodiment, the first washer 402, the spring 404, the second washer 405, and the second anchor clamp 403 are all sleeved on the surface of the steel strand 104, and the second anchor plate 401 is located on the surface of the steel strand 104 on the side away from the limiting plate 3. Specifically, by inserting the steel strand 104 into the first washer 402, spring 404, second washer 405 and second anchor clamp 403, when the steel strand 104 retracts, the spring 404 exerts a pushing force on the second washer 405, thereby pushing the second anchor clamp 403 to one side, thus reducing the amount of retraction of the steel strand 104.

[0020] It should be noted that during use, the first anchor plate 201 is fitted onto the surface of the steel strand 104, and the first anchor clamp 202 is embedded into the anchor hole and positioned on the surface of the steel strand 104 to restrict the steel strand 104. The displacement of the first anchor clamp 202 is restricted by the limiting plate 3. The steel strand 104 is then inserted into the jack, and pressure is applied to the jack by a hydraulic drive device equipped with a pressure gauge. A second anchor plate 401 and a second anchor clamp 403 are then installed at one end of the jack. The hydraulic device is activated, and the jack slowly extends. The structure of the first anchor clamp 202 and the second anchor clamp 403 makes... Since the steel strand 104 can only move outward, the second anchor clamp 403 at the tail end of the jack can clamp the steel strand 104 and pull it outward. Conversely, the steel strand 104 at the front end of the jack can slide outward within the first anchor clamp 202. When the steel strand 104 is pulled to the set tension by the jack, the jack releases the pressure, causing the steel strand 104 to want to retract. Under the action of the second anchor clamp 403 and the first anchor clamp 202, the steel strand 104 is restricted. Under the pushing action of the spring 404 and the second washer 405, the steel strand 104 is further restricted, thereby offsetting part of the retraction displacement and achieving low retraction.

[0021] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A low-retraction structure for a prestressed anchor, characterized in that: The system includes an anchor plate (1), an anchor body (2) fitted onto the surface of the anchor plate (1), a limiting plate (3) fitted onto the surface of the anchor plate (1) and located on one side of the anchor body (2), and a low-retraction assembly (4) fitted onto the surface of the anchor plate (1) and located at the end away from the limiting plate (3). The low-retraction assembly (4) includes a second anchor plate (401), a second anchor clip (403) located on one side inside the second anchor plate (401), the second anchor clip (403) being seven in number, and also includes a second anchor clip (403) located inside the second anchor plate (401) and located on one side. The first gasket (402) on one side of the anchor clamp (403) consists of seven sets, and includes a spring (404) respectively disposed on one side of the first gasket (402) and a second gasket (405) respectively disposed on one side of the spring (404). The first gasket (402), spring (404), second gasket (405) and second anchor clamp (403) are all sleeved on the surface of the steel strand (104), and the second anchor plate (401) is located on the surface of the steel strand (104) on the side away from the limiting plate (3).

2. The low-retraction structure of a prestressed anchorage device according to claim 1, characterized in that: The anchor plate (1) includes a prestressed duct (101), a spiral bar (102) wound on the surface of the prestressed duct (101), an anchor plate (103) located at one end of the prestressed duct (101), and steel strands (104) located inside the prestressed duct (101) and the anchor plate (103), wherein there are seven sets of steel strands (104).

3. The low-retraction structure of a pre-stressed anchorage device according to claim 2, characterized in that: The anchor body (2) includes a first anchor plate (201) and a first anchor clip (202) disposed inside the first anchor plate (201), wherein there are seven sets of the first anchor clip (202).

4. The low-retraction structure of a pre-stressed anchorage device according to claim 3, characterized in that: The first anchor plate (201) is fitted on the surface of the steel strand (104), and the steel strand (104) is respectively embedded in the interior of the first anchor clip (202). The limiting plate (3) is fitted on the surface of the steel strand (104) and is located on one side of the first anchor plate (201).

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