Shape memory alloy pre-stressed anchor rod
Through the design of prestressed anchors of shape memory alloy, the shape memory alloy is shortened by heating to generate tension, which solves the problems of large volume and difficult operation of anchor pulling equipment in the prior art, and achieves more efficient anchor pulling and Improved operational efficiency.
Patent Information
- Application Number
- CN202421115481.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The existing prestressed anchors have large equipment, heavy mass, and difficult operation during the anchor pulling process, especially in high steep slope terrain, resulting in high difficulty in pulling anchors and low operating efficiency.
The shape memory alloy prestressed anchor is used to shorten the shape memory alloy parts during heating and generate tension. Combined with the connecting block, reaction support and support protection plate, the automatic pulling of the anchor is realized, replacing the traditional jack equipment.
It reduces the difficulty of anchor pulling, improves operating efficiency, and simplifies equipment operation, especially in complex terrain.
Smart Images
Figure CN222349677U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a prestressed anchor rod, in particular to a shape memory alloy prestressed anchor rod. Background Art
[0002] Prestressed anchor rods are generally composed of anchor heads, rod bodies and pads. As a key component of the supporting structure, their safety and reliability are crucial to the quality and safety of the project. In projects such as foundation pit support and slope reinforcement, anchor rods are commonly used engineering materials. The principle is to drive one end of the anchor rod into the soil or rock mass, and then grouting to form the anchor rod and the soil into a whole. This method is similar to installing anchor bolts on the wall. After the anchor rod grouting solidifies, equipment is used to pull the anchor rod at the exposed end. The commonly used equipment is a jack. During the anchor rod pulling process, when the force reaches a certain value, the end of the anchor rod is immediately connected to the supporting pile or lattice mesh and other components, and then the jack is removed. The anchoring force generated by the anchor head applies a certain prestressing stress to the surrounding rock, actively reinforcing the surrounding rock. Since the jack requires an oil pump to work, the equipment is large in size and heavy in weight, and it is difficult to operate on terrain such as high and steep slopes. Therefore, it is urgently needed to develop a prestressed anchor rod that can reduce the difficulty of anchor rod pulling. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a shape memory alloy prestressed anchor rod that reduces the difficulty of anchor rod pulling and improves the working efficiency.
[0004] The technical solution adopted by the utility model is: the utility model includes an anchor rod body and a pulling structure, the pulling structure includes a shape memory alloy part, a connecting block, and a reaction force bracket. During construction, the head of the anchor rod body is inserted into the rock and soil body, the tail of the anchor rod body is fixedly connected to one end of the shape memory alloy part, the other end of the shape memory alloy part is fixedly connected to the connecting block, one end of the reaction force bracket is fixedly connected to the connecting block, and the other end of the reaction force bracket is against one side of the rock and soil body; when the shape memory alloy part is heated, the shape memory alloy part is shortened, and the distance between the connecting block and the rock and soil body remains unchanged, so that the shape memory alloy part generates a pulling force on the anchor rod body.
[0005] Furthermore, a support and protection plate is provided on the outer side of the rock and soil body, and a through hole for the anchor rod body is provided on the support and protection plate. The tail of the anchor rod body passes through the through hole and is fixedly connected to the shape memory alloy part.
[0006] Furthermore, the support and protection plate is located between the reaction support and the rock and soil body. When the shape memory alloy member is shortened, the shape memory alloy member pulls the connecting block inward, and the connecting block presses the support and protection plate against the outside of the rock and soil body through the reaction support.
[0007] Furthermore, a fastening nut is provided on the side surface of one end of the shape memory alloy component. After the anchor cable at the tail of the anchor rod body is inserted into the mounting hole at one end of the shape memory alloy component, the fastening nut presses and fixes the anchor cable in the mounting hole of the shape memory alloy component.
[0008] Furthermore, an electric heating plate is arranged on the outer side of the shape memory alloy part.
[0009] Furthermore, an anchor cable clamp is provided at the tail of the anchor rod body, the anchor cable clamp is located outside the supporting protective plate, and the anchor cable clamp is used to fix the anchor cable of the anchor rod body. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the utility model;
[0011] Figure 2 It is a structural schematic diagram of a shape memory alloy component. DETAILED DESCRIPTION
[0012] like Figure 1 and Figure 2 As shown, in this embodiment, the utility model includes an anchor body 1 and a pulling structure 2, the pulling structure 2 includes a shape memory alloy 21, a connecting block 22, and a reaction support 23. During construction, the head of the anchor body 1 is inserted into the rock and soil body 3, the tail of the anchor body 1 is fixedly connected to one end of the shape memory alloy 21, the other end of the shape memory alloy 21 is fixedly connected to the connecting block 22, one end of the reaction support 23 is fixedly connected to the connecting block 22, and the other end of the reaction support 23 is against one side of the rock and soil body 3; when the shape memory alloy 21 is heated, the shape memory alloy 21 is shortened, and the distance between the connecting block 22 and the rock and soil body 3 remains unchanged, so that the shape memory alloy 21 generates a pulling force on the anchor body 1. In this embodiment, the shape memory alloy 21 can be a shape memory alloy block, or a shape memory alloy spring.
[0013] In this embodiment, a support and protection plate 4 is provided on the outer side of the rock and soil body 3, and a through hole 5 for the anchor body 1 is provided on the support and protection plate 4. The tail of the anchor body 1 passes through the through hole 5 and is fixedly connected to the shape memory alloy part 21.
[0014] In this embodiment, the support and protective plate 4 is located between the reaction support 23 and the rock and soil body 3. When the shape memory alloy part 21 is shortened, the shape memory alloy part 21 pulls the connecting block 22 inward, and the connecting block 22 presses the support and protective plate 4 against the outside of the rock and soil body 3 through the reaction support 23.
[0015] In this embodiment, a fastening nut 6 is provided on the side of one end of the shape memory alloy part 21. After the anchor cable at the tail of the anchor rod body 1 is inserted into the mounting hole 7 at one end of the shape memory alloy part 21, the fastening nut 6 presses and fixes the anchor cable in the mounting hole 7 of the shape memory alloy part 21.
[0016] In this embodiment, an electric heating plate 8 is disposed on the outer side of the shape memory alloy member 21 .
[0017] In this embodiment, an anchor cable clamp 9 is provided at the tail of the anchor rod body 1 . The anchor cable clamp 9 is located outside the supporting protective plate 4 . The anchor cable clamp 9 is used to fix the anchor cable of the anchor rod body 1 .
[0018] In this embodiment, the utility model proposes to use a shape memory alloy cylinder instead of a jack, such as Figure 1 and Figure 2 As shown, one end of the shape memory alloy is connected to the anchor rod, and the other end is connected to the reaction frame. When the shape memory alloy is heated, the shape memory alloy will undergo a martensitic phase transformation, that is, the shape memory alloy will shorten, and at this time, a tensile force will be generated on the anchor rod, thereby completing the pulling of the anchor rod. The specific structure of the shape memory alloy cylinder is that one end is fixedly connected to the connecting block 22, and the other end is provided with a hole, the anchor rod can be inserted into the hole, and then the fastening nut is tightened, so that the anchor rod and the memory alloy cylinder are fixed. After the memory alloy is energized, the anchor rod is locked with an anchor cable clamp, and the reaction frame and the memory alloy cylinder can be disassembled.
[0019] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.
Claims
1. A shape memory alloy prestressed anchor rod, comprising an anchor rod body (1) and a pulling structure (2), characterized in that: The pulling structure (2) comprises a shape memory alloy part (21), a connecting block (22), and a reaction force support (23). During construction, the head of the anchor rod body (1) is inserted into the rock and soil body (3), the tail of the anchor rod body (1) is fixedly connected to one end of the shape memory alloy part (21), the other end of the shape memory alloy part (21) is fixedly connected to the connecting block (22), one end of the reaction force support (23) is fixedly connected to the connecting block (22), and the other end of the reaction force support (23) is against one side of the rock and soil body (3); when the shape memory alloy part (21) is heated, the shape memory alloy part (21) is shortened, and the distance between the connecting block (22) and the rock and soil body (3) remains unchanged, so that the shape memory alloy part (21) generates a pulling force on the anchor rod body (1).
2. The shape memory alloy prestressed anchor rod according to claim 1, characterized in that: A support and protection plate (4) is arranged on the outside of the rock and soil body (3), and a through hole (5) for the anchor rod body (1) is provided on the support and protection plate (4), and the tail of the anchor rod body (1) is fixedly connected to the shape memory alloy part (21) after passing through the through hole (5).
3. The shape memory alloy prestressed anchor rod according to claim 2, characterized in that: The support and protection plate (4) is located between the reaction support (23) and the rock and soil body (3); when the shape memory alloy member (21) is shortened, the shape memory alloy member (21) pulls the connection block (22) inward, and the connection block (22) presses the support and protection plate (4) against the outside of the rock and soil body (3) through the reaction support (23).
4. The shape memory alloy prestressed anchor rod according to claim 1, characterized in that: A fastening nut (6) is provided on the side surface of one end of the shape memory alloy component (21); after the anchor cable at the tail end of the anchor rod body (1) is inserted into the mounting hole (7) at one end of the shape memory alloy component (21), the fastening nut (6) presses and fixes the anchor cable in the mounting hole (7) of the shape memory alloy component (21).
5. A shape memory alloy prestressed anchor rod according to any one of claims 1 to 4, characterized in that: An electric heating plate (8) is arranged on the outer side of the shape memory alloy part (21).
6. A shape memory alloy prestressed anchor rod according to claim 2 or 3, characterized in that: An anchor cable clamp (9) is provided at the tail of the anchor rod body (1), the anchor cable clamp (9) is located outside the supporting protective plate (4), and the anchor cable clamp (9) is used to fix the anchor cable of the anchor rod body (1).