Npr composite ground anchor
By using NPR composite cable body and a combination of multiple materials in the ground anchor cable, and taking advantage of the negative Poisson's ratio characteristic of NPR to absorb energy, the problem of ground anchor cable failure under complex mountain stress is solved, achieving efficient energy absorption buffering and multiple tensile resistance effects, thus improving the safety of geotechnical engineering.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIUZHOU CITY QIAOSHA ENG TUBE MATERIAL CO LTD
- Filing Date
- 2025-08-19
- Publication Date
- 2026-06-23
AI Technical Summary
Existing ground anchor cables have poor energy absorption and buffering performance under complex and variable mountain stress conditions, and are prone to breakage due to sudden tensile impact forces, leading to chain reactions and endangering the safety of geotechnical engineering.
The NPR composite cable body is adopted, with some cable sections or strands made of NPR material, combined with ordinary steel strands, steel wires, fibers or steel bars, and formed into an integral ground anchor cable body through connectors. The negative Poisson's ratio characteristic of NPR is used to absorb energy, and it is equipped with isolation pipes, anchoring structures and grouting pipes to ensure fixation and observe the grouting effect.
It improves the impact resistance and safety of ground anchor cables, enabling them to withstand multiple tensile impacts without breaking, thus ensuring the stability and safety of geotechnical engineering.
Smart Images
Figure CN224396517U_ABST
Abstract
Description
Technical Field
[0001] This application relates to a ground anchor cable, and more particularly to an NPR composite ground anchor cable, belonging to the field of prestressed anchor cable technology. Background Technology
[0002] In mining, slope protection, tunnel support, and various geotechnical engineering projects, ground anchor cables are widely used as a key reinforcement and support component in vulnerable areas of mountains, such as mine reinforcement and slope protection. The function of ground anchor cables is to transfer tensile force to stable rock masses, thereby providing support and reinforcement to unstable mountain sections and preventing disasters such as deformation, collapse, and landslides.
[0003] However, ground anchor cables currently face severe challenges in practical applications. Due to the complex geological conditions of mountains, the stress conditions on ground anchor cables are complex and variable. Under the action of natural mountain movements, geological structural changes, or external loads (such as earthquakes and rainfall), ground anchor cables may be subjected to various types of forces, including tension, shear, and bending, and the magnitude and direction of these forces can change at any time. In particular, when a large deformation suddenly occurs in a certain part of the mountain, the ground anchor cable will be subjected to strong tensile forces. Once the tensile force exceeds the bearing limit of the ground anchor cable, it is prone to tensile failure. And the failure of ground anchor cables is often not an isolated event; it can instantly trigger a chain reaction. For example, in a mine, the breakage of a ground anchor cable may cause the surrounding rock mass to lose some support, redistribute stress, and thus cause a sudden increase in the load on adjacent ground anchor cables, eventually leading to the breakage of more anchor cables. In severe cases, it may even lead to the collapse of the entire mine, endangering people's lives and causing huge economic losses. In slope protection, the chain reaction caused by the breakage of ground anchor cables may lead to slope instability, triggering geological disasters such as landslides, which will cause serious damage to surrounding buildings, roads and other infrastructure.
[0004] Most existing ground anchors can only withstand a limited number of tensile impacts, and their energy absorption and buffering performance is poor when faced with complex and variable stress conditions. When encountering large tensile impacts generated by sudden deformation of a mountain, existing ground anchors are unable to effectively absorb and buffer energy through their own structure, thus inevitably leading to tensile breakage. Therefore, it is urgent to develop a new type of ground anchor with good energy absorption and buffering performance that can withstand multiple tensile impacts without breaking, which is of great significance for ensuring the safety and stability of various geotechnical engineering projects. Summary of the Invention
[0005] The purpose of this application is to address the shortcomings and deficiencies of existing ground anchor cables, which are simple in structure, have low breaking elongation, weak energy absorption and buffering capacity, and are prone to tensile breakage when encountering large tensile impact forces generated by sudden deformation of mountains, resulting in harmful chain reactions. This application provides an NPR composite ground anchor cable with a reasonable structure, good energy absorption and buffering performance, and the ability to withstand multiple tensile impacts without breaking. Even when encountering large tensile impact forces generated by sudden deformation of mountains, tensile breakage will not occur, and safety is significantly improved.
[0006] To achieve the above-mentioned application objectives, the technical solution of this application is: an NPR composite ground anchor cable, including a fixed anchor, wherein the fixed anchor is fixed to one end of the NPR composite cable body, and the other end of the NPR composite cable body is connected to the tension end anchor. The NPR composite cable body is a segmented composite cable structure in which some cable segments are made of NPR material, or the NPR composite cable body is a parallel composite cable structure in which some cable strands are made of NPR material.
[0007] Furthermore, some sections of the NPR composite cable body are made of NPR material, while other sections are made of ordinary steel strand, steel wire, fiber, prestressed steel bar or various forms of steel reinforcement. Multiple cable sections are connected and fixed by connectors to form an integral ground anchor cable body; or some strands of the NPR composite cable body are made of NPR material, while other strands are existing conventional strands. Two or more strands of different materials are combined in parallel to form an integral ground anchor cable body.
[0008] Furthermore, an isolation tube is fitted on the outer surface of the section of the NPR composite cable near the tensioning end. The inner wall of the isolation tube and the surface of the NPR composite cable are filled with grease, wax or other non-drying anti-corrosion materials. A positioning plate and / or cable hoop are provided on the NPR cable at intervals.
[0009] Furthermore, the tensioning end anchor includes an anchor plate and an anchor member. The tensioning end of the NPR composite cable passes through the anchor plate and is fixed by the anchor member.
[0010] Furthermore, the anchors are constructed using a nut anchoring structure, a single-hole anchor plate anchoring structure, or a multi-hole anchor plate anchoring structure.
[0011] Furthermore, the nut anchoring structure includes a locking nut and a tensioning end anchoring sleeve. The tensioning end anchoring sleeve is fixedly installed at the end of the NPR cable located on the anchor plate, and a locking nut is installed on the tensioning end anchoring sleeve.
[0012] Furthermore, the single-hole anchor plate anchoring structure includes a single-hole anchor plate and a wedge-shaped clamp. The outer end of the NPR cable passes through the mounting holes on the anchor plate and the single-hole anchor plate, respectively. A wedge-shaped clamp is installed between the hole wall of the single-hole anchor plate mounting hole and the outer surface of the NPR cable.
[0013] Furthermore, the porous anchor plate anchoring structure includes a porous anchor plate and wedge-shaped clips. After the NPR cable passes through the anchor plate, the strands of the NPR cable are inserted into the mounting holes on the porous anchor plate. Wedge-shaped clips are installed between the hole wall of the porous anchor plate mounting hole and the outer surface of the NPR cable.
[0014] Furthermore, a pressure-bearing block is fixedly installed on the outer side of the fixed anchor, and a guide cap is installed on the outer front end of the pressure-bearing block and the outer front end of the NPR cable. A grouting pipe extending to the vicinity of the front end of the NPR cable is inserted into the anchor plate, and an air vent is opened on the anchor plate.
[0015] Furthermore, the connector is an anchor sleeve, which fixes the ends of the two cable segments together by compression; or the connector is a connection structure consisting of an anchor sleeve and a connecting sleeve, with an anchor sleeve fitted at each of the adjacent ends of the two cable segments, and the cable ends are fixed to the anchor sleeves by compression, and the two anchor sleeves are fixed in the connecting sleeves by threaded connection.
[0016] The beneficial effects of this application are:
[0017] 1. In this application, some sections of the ground anchor cable body are made of NPR material to form a cable structure, while other sections are made of existing conventional cable bodies. They are connected and fixed to form an integral ground anchor cable body. Alternatively, some strands are made of NPR material. Strands of various different materials are combined in parallel to form an integral ground anchor cable body. This utilizes the negative Poisson's ratio characteristic of NPR, which has high strength and toughness, good impact resistance, and excellent shear resistance. It can absorb and dissipate energy through its own deformation.
[0018] 2. This application adopts a reliable anchoring structure, which is conducive to the smooth entry of the anchor rod into the anchor hole and effective tensioning. It is equipped with grouting pipes distributed along the cable body and extending to the vicinity of the front end of the cable body. The completion of grouting is judged by observing the overflow of grout from the vent hole, thus ensuring the grouting and prestressing tensioning effect.
[0019] 3. The structure of this application is reasonable, with good energy absorption and buffering performance. It can withstand multiple tensile impacts without breaking. Even when encountering large tensile impact forces generated by sudden deformation of the mountain, it will not experience tensile fracture. The safety is significantly improved, ensuring the safety and stability of geotechnical engineering. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the first embodiment of this application.
[0021] Figure 2 yes Figure 1 A magnified view of a portion of the image.
[0022] Figure 3 This is a schematic diagram of the structure of the second embodiment of this application.
[0023] Figure 4 This is a schematic diagram of the structure of the third embodiment of this application.
[0024] Figure 5 This is a schematic diagram of the structure of the connector according to the first embodiment of this application.
[0025] Figure 6 This is a schematic diagram of the second embodiment of the connector in this application.
[0026] Figure 7 This is a schematic diagram of the second embodiment of the connector in this application.
[0027] In the diagram: 1. Fixed anchor; 2. NPR composite cable body; 3. Bearing block; 4. Guide cap; 5. Positioning plate; 6. Anchor plate; 7. Protective sleeve; 8. Locking nut; 9. Tensioning end anchor sleeve; 10. Grouting pipe; 11. Vent hole; 12. Grout; 13. Single-hole anchor plate; 14. Wedge-shaped clamp; 15. Multi-hole anchor plate; 16. Cable clamp; 17. Connector; 18. Anchor sleeve; 19. Connecting sleeve; 20. Isolation pipe; 20. Anchoring section La; 11. Tensioning section Lb. Detailed Implementation
[0028] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] See Figures 1 to 7 This application discloses an NPR composite ground anchor cable, comprising a fixed anchor 1, characterized in that: the fixed anchor 1 is fixed to one end of the NPR composite cable body 2, the other end of the NPR composite cable body 2 is connected to the tension end anchor, and the NPR composite cable body 2 is a segmented composite cable structure in which some cable segments are made of NPR material, or the NPR composite cable body 2 is a parallel composite cable structure in which some cable strands are made of NPR material.
[0030] The NPR composite cable body 2 has some sections made of NPR material, while other sections are made of ordinary steel strand, steel wire, fiber, prestressed steel bar or various forms of steel bars. Multiple cable sections are connected and fixed by connector 17 to form an integral ground anchor cable body; or some strands of the NPR composite cable body 2 are made of NPR material, while other strands are existing conventional strands. Two or more strands of different materials are combined in parallel to form an integral ground anchor cable body.
[0031] An isolation tube 20 is fitted on the outer surface of a section of the NPR composite cable body 2 near the tensioning end. The inner wall of the isolation tube 20 and the surface of the NPR composite cable body 2 are filled with grease, wax or other non-drying anti-corrosion materials. A positioning plate 5 and / or cable hoop 16 are provided on the NPR cable body 2 at intervals.
[0032] The tensioning end anchor includes an anchor plate 6 and an anchor member. The tensioning end of the NPR composite cable 2 passes through the anchor plate 6 and is fixed by the anchor member.
[0033] The anchors are anchored using a nut anchoring structure, a single-hole anchor plate anchoring structure, or a multi-hole anchor plate anchoring structure.
[0034] The nut anchoring structure includes a locking nut 8 and a tensioning end anchoring sleeve 9. The tensioning end anchoring sleeve 9 is fixedly installed at the end of the NPR cable body 2 located on the anchor plate 6, and the locking nut 8 is installed on the tensioning end anchoring sleeve 9.
[0035] The single-hole anchor plate anchoring structure includes a single-hole anchor plate 13 and a wedge-shaped clamp 14. The outer end of the NPR cable 2 passes through the mounting holes on the anchor plate 6 and the single-hole anchor plate 13, respectively. A wedge-shaped clamp 14 is installed between the hole wall of the mounting hole of the single-hole anchor plate 13 and the outer surface of the NPR cable 2.
[0036] The porous anchor plate anchoring structure includes a porous anchor plate 15 and wedge-shaped clips 14. After the NPR cable body 2 passes through the anchor plate 6, the strands of the NPR cable body 2 are inserted into the mounting holes on the porous anchor plate 15. Wedge-shaped clips 14 are installed between the hole wall of the mounting hole of the porous anchor plate 15 and the outer surface of the NPR cable body 2.
[0037] A pressure-bearing block 3 is fixedly installed on the outer side of the fixed anchor 1. A guide cap 4 is installed on the outer front end of the pressure-bearing block 3 and the outer front end of the NPR cable 2. A grouting pipe 10 extending to the vicinity of the front end of the NPR cable 2 is inserted into the anchor plate 6. An exhaust hole 11 is opened on the anchor plate 6.
[0038] The connector 17 is an anchor sleeve 18, which fixes the ends of the two cable sections together by compression; or the connector 17 is a connection structure consisting of an anchor sleeve 18 and a connecting sleeve 19, with an anchor sleeve 18 fitted at each of the adjacent ends of the two cable sections, and the ends of the cable sections are fixed to the anchor sleeves 18 by compression, and the two anchor sleeves 18 are fixed in the connecting sleeve 19 by threaded connection.
[0039] Referring to the accompanying drawings, the NPR composite cable 2 used in this application fully utilizes the negative Poisson's ratio characteristic of NPR, exhibiting no significant necking under tension, high strength and toughness, good impact resistance, and excellent shear resistance. The NPR cable 2 of this application can adopt a composite cable structure, where one section is made of NPR material, and another section uses existing conventional cable materials, with multiple sections connected and fixed together to form a complete cable. Alternatively, some strands can be made of NPR material, while other strands are existing conventional strands, with two or more different materials combined in parallel to form an integral ground anchor cable. This not only saves costs but also meets diverse application needs. The specific structure and principle are as follows:
[0040] A fixed anchor 1 is fixedly installed at one end of the NPR composite cable body 2. A pressure-bearing block 3 is fixedly installed at one end or externally of the fixed anchor 1. A guide cap 4 is installed on the pressure-bearing block 3. The guide cap 4 is located on the outer side of the front end of the NPR composite cable body 2 and provides external protection for the front end of the NPR composite cable body 2 and other anchoring structures. The guide cap 4 serves to guide the anchor cable when it is inserted into the anchor hole, and also protects the front end of the NPR composite cable body 2 and the fixed end anchor. The front end of the guide cap 4 is conical, spherical, or other shapes with a pointed front end, which facilitates the entry of the anchor rod into the anchor hole.
[0041] The tensioning end anchorage on the NPR composite cable 2 consists of an anchor plate 6, an anchoring structure, and spiral reinforcement. The portion of the NPR composite cable 2 in contact with the grout 12 is fitted with an isolation tube 20 or an isolation sleeve. The outer surface of the NPR cable 2 located in the anchoring section La does not have an isolation tube 20 or isolation sleeve, allowing the outer sheath to be peeled off. The space between the inner wall of the isolation tube 20 and the surface of the NPR composite cable 2 is filled with grease, wax, or other non-drying anti-corrosion material that facilitates sliding. During tensioning, the NPR cable 2 and the isolation tube 20 or isolation sleeve can slide relative to each other. After tensioning, the anchor is sealed, and the construction is complete.
[0042] The NPR composite cable body 2 employs a cable structure with some segments made of NPR material and others made of conventional cable materials, such as ordinary steel strands, steel wires, carbon fiber cable structures, prestressed steel bars, threaded steel bars, or other forms of prestressed steel reinforcement. The cross-section of the NPR cable body 2 is a bar, wire, or a combination of both. When using a composite cable structure, multiple cable segments are fixed together by connectors 17, forming an integral ground anchor cable body. Another implementation is that some strands of the NPR composite cable body 2 are made of NPR material, while other strands are conventional strands. Two or more different materials are combined in parallel to form an integral ground anchor cable body. A positioning plate 5 is installed at intervals on the NPR composite cable body 2. When the NPR composite cable body 2 uses multiple strands or bundles, cable clamps 16 are installed at intervals on the ground anchor cable body to prevent strands from unraveling.
[0043] Connector 17 is used to connect and fix the ends of two cable segments. It can adopt various structural forms, primarily an anchor sleeve connection structure or a connection structure consisting of anchor sleeve 18 and connecting sleeve 19. When using an anchor sleeve connection structure, the anchor sleeve 18 fixes the ends of the two cable segments together by compression. When using a connection structure consisting of anchor sleeve 18 and connecting sleeve 19, each adjacent end of the two cable segments is fitted with an anchor sleeve 18, and the cable ends are fixed to the anchor sleeves 18 by compression. The two anchor sleeves 18 are then fixed within the connecting sleeve 19 by threaded connections. Alternatively, epoxy resin or zinc-copper alloy or other media materials can be used within the anchor sleeve 18 to achieve the connection and fixation between the two cable segments.
[0044] Anchor plate 6 has through holes for inserting grouting pipe 10. After passing through the through holes, grouting pipe 10 is positioned along the length of NPR composite cable 2 and extends to near the front end of NPR composite cable 2 to ensure that grout fills the front end of NPR composite cable 2 and the area around guide cap 4 during grouting. Anchor plate 6 also has vent holes 11, which are used to release air and allow grout to overflow during grouting. The completion of grouting is determined by observing the overflow from vent holes 11. Furthermore, a protective sleeve 7 is installed between the outer surface of NPR composite cable 2 on the inner side of anchor plate 6 and anchor plate 6, providing excellent corrosion protection.
[0045] The NPR composite cable 2 at the tensioning end of this application is fixed by anchors after passing through the anchor plate 6. The anchors can adopt various structural forms, mainly including nut anchoring structure, single-hole anchor plate anchoring structure or multi-hole anchor plate anchoring structure.
[0046] Example 1: The nut anchoring structure mainly includes a locking nut 8 and a tensioning end anchoring sleeve 9. The tensioning end anchoring sleeve 9 is fixedly installed at the end of the NPR composite cable body 2 located on the anchor plate 6. The locking nut 8 is installed on the tensioning end anchoring sleeve 9, and the connection and fixation with the tensioning end anchoring sleeve 9 are achieved by the locking nut 8.
[0047] Example 2: A single-hole anchor plate anchoring structure is adopted, mainly including a single-hole anchor plate 13 and a wedge-shaped clamp 14. The outer end of the NPR composite cable 2 passes through the mounting holes on the anchor plate 6 and the single-hole anchor plate 13 respectively. A wedge-shaped clamp 14 is installed between the hole wall of the mounting hole of the single-hole anchor plate 13 and the outer surface of the NPR composite cable 2. The wedge-shaped clamp 14 is used to achieve locking. The greater the tension, the greater the locking force.
[0048] Example 3: A multi-hole anchor plate anchoring structure is adopted, mainly including a multi-hole anchor plate 15 and wedge-shaped clamps 14. After the NPR composite cable body 2 passes through the anchor plate 6, the strands of the NPR composite cable body 2 are inserted into the mounting holes on the multi-hole anchor plate 15. Wedge-shaped clamps 14 are installed between the hole wall of the mounting hole of the multi-hole anchor plate 15 and the outer surface of the NPR composite cable body 2. The wedge-shaped clamps 14 are also used to lock the cable body, except that multiple strands are locked separately, thereby achieving the locking and fixing of the entire cable body.
[0049] The above description is a further detailed explanation of this application in conjunction with specific embodiments. It should not be assumed that the specific implementation of this application is limited to these descriptions. For those skilled in the art to which this application pertains, any simple modifications and substitutions made without departing from the concept of this application should be considered to fall within the protection scope of this application.
Claims
1. An NPR composite ground anchor cable, comprising a fixed anchor (1), characterized in that: The fixed anchor (1) is fixed to one end of the NPR composite cable body (2), and the other end of the NPR composite cable body (2) is connected to the tensioning end anchor. The NPR composite cable body (2) is a segmented composite cable structure with some cable segments made of NPR material, or the NPR composite cable body (2) is a parallel composite cable structure with some cable strands made of NPR material.
2. The NPR composite ground anchor cable according to claim 1, characterized in that: The NPR composite cable body (2) has some sections made of NPR material to form cable structures, and other sections made of ordinary steel strands, steel wires, fibers, prestressed steel bars or various forms of steel bars. Multiple cable sections are connected and fixed by connectors (17) to form an integral ground anchor cable body; or some strands of the NPR composite cable body (2) are made of NPR material, and other strands are existing conventional strands. Two or more strands of different materials are combined in parallel to form an integral ground anchor cable body.
3. The NPR composite ground anchor cable according to claim 1, characterized in that: The outer surface of the section of the NPR composite cable (2) near the tensioning end is fitted with an isolation tube (20). The inner wall of the isolation tube (20) and the surface of the NPR composite cable (2) are filled with grease, wax or other non-drying anti-corrosion materials. A positioning plate (5) and / or cable hoop (16) are provided on the NPR cable (2) at intervals.
4. The NPR composite ground anchor cable according to claim 1, characterized in that: The tensioning end anchor includes an anchor plate (6) and an anchor. The tensioning end of the NPR composite cable (2) passes through the anchor plate (6) and is fixed by the anchor.
5. The NPR composite ground anchor cable according to claim 4, characterized in that: The anchors are anchored using a nut anchoring structure, a single-hole anchor plate anchoring structure, or a multi-hole anchor plate anchoring structure.
6. The NPR composite ground anchor cable according to claim 5, characterized in that: The nut anchoring structure includes a locking nut (8) and a tensioning end anchoring sleeve (9). The tensioning end anchoring sleeve (9) is fixedly installed at the end of the NPR cable body (2) located on the anchor plate (6), and the locking nut (8) is installed on the tensioning end anchoring sleeve (9).
7. The NPR composite ground anchor cable according to claim 5, characterized in that: The single-hole anchor plate anchoring structure includes a single-hole anchor plate (13) and a wedge-shaped clip (14). The outer end of the NPR cable (2) passes through the mounting holes on the anchor plate (6) and the single-hole anchor plate (13), respectively. A wedge-shaped clip (14) is installed between the hole wall of the mounting hole of the single-hole anchor plate (13) and the outer surface of the NPR cable (2).
8. The NPR composite ground anchor cable according to claim 5, characterized in that: The porous anchor plate anchoring structure includes a porous anchor plate (15) and wedge-shaped clips (14). After the NPR cable body (2) passes through the anchor plate (6), the strands of the NPR cable body (2) are inserted into the mounting holes on the porous anchor plate (15). Wedge-shaped clips (14) are installed between the hole wall of the mounting hole of the porous anchor plate (15) and the outer surface of the NPR cable body (2).
9. The NPR composite ground anchor cable according to claim 1, characterized in that: A pressure block (3) is fixedly installed on the outside of the fixed anchor (1). A guide cap (4) is installed on the outer front end of the pressure block (3) and the outer front end of the NPR cable (2). A grouting pipe (10) extending to the front end of the NPR cable (2) is inserted into the anchor plate (6). An exhaust hole (11) is opened on the anchor plate (6).
10. The NPR composite ground anchor cable according to claim 2, characterized in that: The connector (17) is an anchor sleeve (18), which fixes the ends of the two cable sections together by compression; or the connector (17) is a connection structure consisting of an anchor sleeve (18) and a connecting sleeve (19), with an anchor sleeve (18) fitted at each of the adjacent ends of the two cable sections, and the ends of the cable sections are fixed to the anchor sleeve (18) by compression, and the two anchor sleeves (18) are fixed in the connecting sleeve (19) by threaded connection.