Pre-stressed anchor cable supporting structure suitable for freezing and thawing prevention of high and cold side slope
By using cold-resistant concrete layers, heat-insulating filling layers, and low-temperature resistant materials in prestressed anchor cables, the structural failure problem caused by freeze-thaw cycles and temperature differences in anchor cables in high-altitude areas has been solved, achieving effective support in cold environments and extending the service life of slope support structures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NORTH CHINA ENGINEERING INVESTIGATION INSTITUTE CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-15
AI Technical Summary
In the extreme environment of high-altitude areas, prestressed anchor cables suffer from reduced prestress and deformation due to freeze-thaw cycles and drastic temperature changes, resulting in decreased structural strength and inability to effectively support slopes. Furthermore, the mechanical properties of anchor cable materials deteriorate in cold environments, making them prone to embrittlement and freeze-thaw damage.
The prestressed anchor cable structure, which consists of a cold-resistant concrete layer, a heat-insulating filling layer, and low-temperature resistant materials, includes steel strands, sleeves, a crushed stone antifreeze layer, elastic washers, and a protective shell. Through double heat insulation, it blocks the thermal bridging effect, reduces the impact of freeze-thaw cycles, and enhances the adaptability and durability of the anchor cable.
It effectively reduces the direct impact of freeze-thaw cycles on steel strands, extends the service life of slope support structures, prevents anchor cable failure in cold regions, and has the advantages of low cost and high efficiency, solving the problem of deformation and damage of anchor cables in slope reinforcement in cold regions.
Smart Images
Figure CN224243857U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anchor cable structure technology, and in particular to a prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes. Background Technology
[0002] In the extreme environments of high-altitude regions, drastic temperature variations and freeze-thaw cycles can easily lead to structural and strength deterioration of slope rock masses, resulting in slope instability. Prestressed anchor cables are a commonly used measure in slope protection structures and have been widely used in slope engineering in various environments. However, in the extreme environments of high-altitude regions, affected by freeze-thaw cycles and drastic temperature variations, anchor cables have poor resistance to deformation. Under freeze-thaw cycles, the prestress of the anchor cables may decrease significantly, leading to anchor cable deformation and rendering conventional anchor cable structures ineffective. On the one hand, freeze-thaw cycles cause changes in the volume of the rock mass, resulting in significant deformation of the anchor head and a substantial reduction in the prestress of the anchor cable. The prestress of the anchor cable is mainly achieved through the tensioning deformation of the free section and the anchoring section. On the other hand, the anchoring materials of the anchoring section and the steel strands of the free section are easily affected by the cold environment, and their strength, toughness, and other mechanical properties may decrease, leading to embrittlement and freeze-thaw damage. Utility Model Content
[0003] In view of this, in order to solve the problem of prestressed anchor cable failure caused by freeze-thaw cycles and drastic temperature changes in the extreme environment of high-altitude areas, the embodiments of this utility model provide a prestressed anchor cable support structure suitable for freeze-thaw protection of cold slopes.
[0004] An embodiment of this utility model provides a prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes, comprising:
[0005] Steel strands are arranged within the anchor holes along the length of the anchor holes;
[0006] The inner anchoring section includes a cold-resistant concrete layer, and the lower end of the steel strand is embedded in the cold-resistant concrete layer;
[0007] The free section includes a sleeve and a heat insulation filling layer. The sleeve is set in the anchor hole and its lower end is embedded in the cold-resistant concrete layer. The middle part of the steel strand passes through the sleeve, and the heat insulation filling layer fills the space between the outer wall of the sleeve and the inner wall of the anchor hole.
[0008] The outer anchoring section includes a crushed stone antifreeze layer, a pad, an anchor, an elastic washer, and a protective shell. The crushed stone antifreeze layer is disposed at the anchor hole opening. The pad is fixed to the outside of the crushed stone antifreeze layer. The protective shell is fixed to the outside of the pad. The elastic washer is attached to the outer side of the crushed stone antifreeze layer. The anchor is disposed inside the protective shell. The upper end of the steel strand passes through the crushed stone antifreeze layer and the elastic washer and is locked by the anchor.
[0009] Furthermore, the outer side of the pad is provided with a groove, the protective shell is sealed to the edge of the groove, and the anchor is set in the groove to anchor the upper end of the steel strand.
[0010] Furthermore, the groove is a trapezoidal groove.
[0011] Furthermore, a steel pad is provided on the outer side of the crushed stone antifreeze layer, the elastic washer is attached to the outer side of the steel pad, and the upper end of the steel strand passes through the crushed stone antifreeze layer, the steel pad and the elastic washer in sequence before being locked by the anchor.
[0012] Furthermore, the protective shell is made of a low-temperature composite material that can withstand -40°C, and the elastic gasket is made of a low-temperature elastic material that can withstand -40°C.
[0013] Furthermore, the heat insulation filling layer is made of glass fiber cotton felt material.
[0014] Furthermore, the crushed stone antifreeze layer is composed of crushed stone with a particle size of 20-50mm.
[0015] Furthermore, the sleeve is a PE sleeve.
[0016] Furthermore, the surface of the steel strand is coated with an anti-corrosion coating.
[0017] Furthermore, the inner anchoring section also includes a wire-laying ring and a clamping ring. The lower end of the steel strand is provided with a guide cap. The lower end of the steel strand passes through the wire-laying ring and the clamping ring. The wire-laying ring and the clamping ring are embedded in the cold-resistant concrete layer and are fixed by the wire-laying ring and the clamping ring.
[0018] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows:
[0019] 1. This utility model discloses a prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes. By setting pads and protective shells in the outer anchoring section, it achieves good heat insulation. Furthermore, through the combined action of elastic washers and crushed stone antifreeze layer, the elastic washers adapt to the deformation of the steel strands caused by freeze-thaw action, effectively reducing the direct impact of freeze-thaw action on the steel strands. At the same time, by setting a heat insulation filling layer between the outer wall of the sleeve and the inner wall of the anchor hole in the free section, the heat insulation filling layer isolates the heat transfer from the outside. Thus, through double heat insulation, the thermal bridging effect is blocked, effectively reducing the probability of embrittlement and freeze-thaw damage of the internal structure, extending the service life of the slope support structure, and preventing anchor cable failure during use in high-altitude and cold regions. It also has the advantages of low cost and high efficiency, solving the problem of deformation and failure of anchor cables in the reinforcement of slopes in high-altitude and cold regions.
[0020] 2. This utility model provides a prestressed anchor cable support structure suitable for freeze-thaw protection of cold slopes. By using cold-resistant high-performance concrete as the anchoring material for the anchoring section, it effectively avoids the loss of mechanical properties caused by repeated freeze-thaw cycles over many years of use, and further extends the service life of the slope support structure. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes according to this utility model;
[0022] Figure 2 This is a cross-sectional view of the free segment;
[0023] Figure 3 This is a schematic diagram of the outer anchorage section.
[0024] In the diagram: 1. Steel strand; 2. Outer anchorage section; 3. Free section; 4. Inner anchorage section; 5. Cold-resistant concrete layer; 6. Sleeve; 7. Thermal insulation filling layer; 8. Crushed stone antifreeze layer; 9. Pad; 10. Protective shell; 11. Elastic washer; 12. Anchor; 13. Steel pad; 14. Guide cap; 15. Wire ring; 16. Hoop ring; 17. Anchor hole. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.
[0026] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0028] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.
[0029] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this utility model does not involve any improvement to the internal structure and method.
[0030] It should be further noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] Please refer to Figure 1 The present invention provides a prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes. It is mainly used for slope support in extreme environments in high-altitude areas and mainly includes steel strand 1, inner anchor section 4, free section 3 and outer anchor section 2.
[0032] The steel strand 1 is arranged along the length of the anchor hole 17 within the anchor hole 17. The inner anchoring section 4 includes a cold-resistant concrete layer 5, and the lower end of the steel strand 1 is embedded in the cold-resistant concrete layer 5, anchoring the lower end of the steel strand 1 to the bottom of the anchor hole 17 through the cold-resistant concrete layer 5. The cold-resistant concrete layer 5 is cast with cold-resistant concrete mortar, possessing excellent low-temperature mechanical properties and maintaining a stable anchoring effect in extremely cold environments.
[0033] To ensure the anchorage position of the steel strand 1 in the cold-resistant concrete layer 5, the inner anchorage section 4 further includes a wire-supporting ring 15 and a clamping ring 16. A guide cap 14 is provided at the lower end of the steel strand 1. The lower end of the steel strand 1 passes through the wire-supporting ring 15 and the clamping ring 16. The wire-supporting ring 15 and the clamping ring 16 are embedded in the cold-resistant concrete layer 5 and fixed by them. The guide cap 14 is made of alloy material and is used to guide the installation of the steel strand 1 and protect its end. Multiple wire-supporting rings 15 and clamping rings 16 can be provided, spaced apart, to support and constrain the steel strand 1, ensuring accurate embedding at the target position. During freeze-thaw cycles or slope displacement, the rigid support of the wire-supporting ring 15 restricts the free swing of the steel strand 1, reducing the risk of fatigue damage and extending the service life of the anchor cable.
[0034] In some embodiments, the surface of the steel strand 1 is coated with an anti-corrosion coating to improve its durability in low-temperature and freeze-thaw environments.
[0035] Combination Figure 2 As shown, the free section 3 includes a sleeve 6 and a heat-insulating filling layer 7, which can be made of fiberglass felt. The sleeve 6 is disposed within the anchor hole 17 and its lower end is embedded in the cold-resistant concrete layer 5. The middle part of the steel strand 1 passes through the sleeve 6, and the heat-insulating filling layer 7 fills the space between the outer wall of the sleeve 6 and the inner wall of the anchor hole 17. In some embodiments, the free section 3 also has a wire-supporting ring 15, which is disposed within the sleeve 6. The steel strand 1 passes through the wire-supporting ring 15, and the wire-supporting ring 15 keeps the steel strand 1 in a predetermined position.
[0036] The sleeve 6 is generally made of a material with excellent thermal insulation properties. For example, in this embodiment, the sleeve 6 is a PE sleeve 6, made of PE material, and the thermal conductivity of the PE sleeve 6 is ≤0.5W / (m·K). It is understood that in other embodiments, the sleeve 6 may be made of other materials with excellent thermal insulation properties.
[0037] Combination Figure 3 As shown, the outer anchoring section 2 includes a crushed stone antifreeze layer 8, a pad 9, an anchor 12, an elastic washer 11, and a protective shell 10. The crushed stone antifreeze layer 8 is disposed at the opening of the anchor hole 17. The pad 9 is fixed to the outside of the crushed stone antifreeze layer 8. The protective shell 10 is fixed to the outside of the pad 9. The elastic washer 11 is attached to the outer side of the crushed stone antifreeze layer 8. The anchor 12 is disposed inside the protective shell 10. The upper end of the steel strand 1 passes through the crushed stone antifreeze layer 8 and the elastic washer 11 and is locked by the anchor 12.
[0038] Specifically, the outer side of the pad 9 is provided with a groove, which is a trapezoidal groove. The protective shell 10 is sealed to the edge of the groove by a fastener, and the anchor 12 is set in the groove to anchor the upper end of the steel strand 1. The protective shell 10 is made of a low-temperature composite material resistant to -40℃, which is used to protect the internal structure of the protective shell 10 from freeze-thaw cycles and external environmental influences.
[0039] In some embodiments, the outer side of the crushed stone antifreeze layer 8 is also provided with a steel pad 13, the elastic washer 11 is attached to the outer side of the steel pad 13, and the upper end of the steel strand 1 passes through the crushed stone antifreeze layer 8, the steel pad 13 and the elastic washer 11 in sequence and is then locked by the anchor 12.
[0040] The elastic gasket 11 is generally made of a low-temperature elastic material resistant to -40℃, such as TPU material, which can maintain its elastic properties under freeze-thaw cycles. The crushed stone antifreeze layer 8 is made of crushed stone with a particle size of 20-50mm, which can reduce the direct impact of freeze-thaw action on the pier 9 and the surrounding structure.
[0041] This utility model provides a prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes. When freeze-thaw action occurs on the slope, the pad 9 and protective shell 10 provide good heat insulation. Furthermore, the elastic washer 11 and the crushed stone antifreeze layer 8 work together to allow the elastic washer 11 to adapt to the deformation of the steel strand 1 caused by freeze-thaw action, effectively reducing the direct impact of freeze-thaw action on the steel strand 1. At the same time, the free section 3 has a heat insulation filling layer 7 between the outer wall of the sleeve 6 and the inner wall of the anchor hole 17, which isolates the transfer of heat from the outside. In this way, the thermal bridge effect is blocked by double heat insulation, effectively reducing the probability of embrittlement and freeze-thaw damage of the internal structure, extending the service life of the slope support structure, and preventing anchor cable failure during use in high-altitude and cold regions.
[0042] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.
[0043] Where there is no conflict, the embodiments and features described above can be combined with each other. The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes, characterized in that, include: Steel strands are arranged within the anchor holes along the length of the anchor holes; The inner anchoring section includes a cold-resistant concrete layer, and the lower end of the steel strand is embedded in the cold-resistant concrete layer; The free section includes a sleeve and a heat insulation filling layer. The sleeve is set in the anchor hole and its lower end is embedded in the cold-resistant concrete layer. The middle part of the steel strand passes through the sleeve, and the heat insulation filling layer fills the space between the outer wall of the sleeve and the inner wall of the anchor hole. The outer anchoring section includes a crushed stone antifreeze layer, a pad, an anchor, an elastic washer, and a protective shell. The crushed stone antifreeze layer is disposed at the anchor hole opening. The pad is fixed to the outside of the crushed stone antifreeze layer. The protective shell is fixed to the outside of the pad. The elastic washer is attached to the outer side of the crushed stone antifreeze layer. The anchor is disposed inside the protective shell. The upper end of the steel strand passes through the crushed stone antifreeze layer and the elastic washer and is locked by the anchor.
2. The prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The outer side of the pad is provided with a groove, the protective shell is sealed to the edge of the groove, and the anchor is set in the groove to anchor the upper end of the steel strand.
3. The prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 2, characterized in that: The groove is a trapezoidal groove.
4. The prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The outer side of the crushed stone antifreeze layer is also provided with a steel pad, the elastic washer is attached to the outer side of the steel pad, and the upper end of the steel strand passes through the crushed stone antifreeze layer, the steel pad and the elastic washer in sequence and is locked by the anchor.
5. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The protective shell is made of a low-temperature composite material that can withstand temperatures as low as -40°C, and the elastic gasket is made of a low-temperature elastic material that can withstand temperatures as low as -40°C.
6. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The heat insulation filling layer is made of glass fiber cotton felt.
7. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The crushed stone antifreeze layer is composed of crushed stone with a particle size of 20-50mm.
8. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The sleeve is a PE sleeve.
9. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The surface of the steel strand is coated with an anti-corrosion coating.
10. A prestressed anchor cable support structure suitable for freeze-thaw protection of high-altitude and cold slopes as described in claim 1, characterized in that: The inner anchoring section also includes a wire-laying ring and a clamping ring. The lower end of the steel strand is provided with a guide cap. The lower end of the steel strand passes through the wire-laying ring and the clamping ring. The wire-laying ring and the clamping ring are embedded in the cold-resistant concrete layer and are fixed by the wire-laying ring and the clamping ring.