Frost heaving prevention structure for subgrade in alpine region

Abstract

The utility model discloses a high cold region freeze -thaw cycle roadbed anti -deformation reinforcing structure relates to roadbed engineering technical field, including: roadbed base layer, concrete layer is set up in the top of roadbed base layer, asphalt layer is set up in the top of concrete layer, reinforcing layer is symmetrically set up in the both sides of concrete layer, drainage component is set up in the bottom of reinforcing layer and is matched with roadbed base layer, hot stick is evenly set up in the both sides of roadbed base layer top, the utility model discloses a hot stick is set up, utilizes the freeze -thaw cycle of internal liquid nitrogen, and the temperature of roadbed is reduced in winter and is prevented frost heaving and thawing sinking, and the external heat is blocked in summer and is passed into, and the long -term freezing of roadbed base layer is maintained, and the service life of roadbed is avoided deformation and prolongs.

Description

Technical Field

[0001] This utility model relates to the field of roadbed engineering technology, specifically to a deformation-resistant reinforcement structure for roadbeds in high-altitude and cold regions based on freeze-thaw cycles. Background Technology

[0002] In recent years, with the continuous expansion of the expressway network, highway construction in high-altitude and cold regions has increased significantly. However, under the influence of frequent freeze-thaw cycles in these frigid regions, expressway subgrades often experience uneven settlement and other defects after construction, leading to road surface cracking, deformation, and even misalignment, severely impacting the normal traffic function and structural safety of the roads. Especially under the alternating effects of low winter temperatures and spring / summer thawing, the permafrost layer is prone to frost heave and thaw settlement, causing a decrease in foundation bearing capacity and structural instability, which in turn triggers a series of road damage problems. This not only increases the later maintenance costs of the roads but also necessitates frequent major repairs, seriously affecting the service life of the roads and the convenience of residents' travel.

[0003] Currently, existing technologies typically employ the method of covering the roadbed surface with insulation materials to reduce heat exchange. However, these insulation materials are prone to aging, damage, or performance degradation after prolonged exposure to harsh natural environments, resulting in an inability to maintain their insulation effect over time and ultimately causing foundation instability phenomena such as frost heave and thaw settlement. Furthermore, traditional foundation reinforcement methods often focus on single forms, such as replacement, compaction, or pile foundations. These measures often fail to simultaneously meet the dual requirements of preventing frost heave and thaw settlement, lacking a systematic approach to addressing the entire freeze-thaw cycle.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In response to the problems in related technologies, this utility model proposes a freeze-thaw cycle roadbed anti-deformation reinforcement structure for high-altitude and cold regions, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: The freeze-thaw cycle roadbed deformation prevention and reinforcement structure for high-altitude and cold regions includes: a roadbed foundation layer; a concrete layer, placed on top of the roadbed foundation layer; an asphalt layer, placed on top of the concrete layer; a reinforcement layer, symmetrically placed on both sides of the concrete layer; a drainage component, placed at the bottom of the reinforcement layer and working in conjunction with the roadbed foundation layer; and heat pipes, evenly placed on both sides of the top of the roadbed foundation layer.

[0007] Furthermore, in order to improve the bond between the subgrade foundation layer and the concrete layer through the geotextile layer and prevent relative slippage between the soil and the superstructure, CFG piles are used to further strengthen the compressive and shear resistance of the subgrade foundation layer and avoid uneven expansion and settlement of the foundation caused by freeze-thaw cycles. The top of the subgrade foundation layer and the bottom of the concrete layer are connected by the geotextile layer, and CFG piles are installed through the geotextile layer.

[0008] Furthermore, in order to collect and quickly drain the water on the surface of the asphalt layer, prevent water infiltration from causing soil softening, and ensure the structural stability of the roadbed foundation layer, the drainage component includes a drainage channel set at the bottom of the reinforcement layer, and the drainage channel is located at the top of the roadbed foundation layer, with a drainage groove at the top of the drainage channel.

[0009] Furthermore, in order to effectively maintain the frozen state of the roadbed foundation layer in winter to prevent frost heave and thaw settlement, and to block heat transmission in summer to prevent the roadbed foundation layer from melting and ensure the long-term stability of the roadbed, the heat pipe has a hollow structure and is filled with liquid nitrogen. Several heat dissipation fins are provided on the top of the outer circumference of the heat pipe, and spiral patterns are provided on the bottom of the outer circumference of the heat pipe. Reinforcing members are provided at the bottom of the heat pipe.

[0010] Furthermore, in order to increase the contact area and friction between the heat pipe and the roadbed foundation layer, and to improve the lateral pull-out resistance and overall stability of the heat pipe, the spiral pattern is in the form of an equidistant spiral structure.

[0011] Furthermore, in order to enhance the stepwise embedment between the heat pipe and the roadbed foundation layer, increase the contact area and lateral resistance, and improve the pull-out and shear resistance, the reinforcement is a continuous cone structure with the diameter of the cone section decreasing in a stepwise manner.

[0012] The beneficial effects of this utility model are as follows: 1. This utility model uses a heat pipe to generate heat and utilize the freeze-thaw cycle of liquid nitrogen inside to lower the roadbed temperature in winter, preventing frost heave and thaw settlement; in summer, it blocks the ingress of external heat, keeping the roadbed foundation layer frozen for a long time, avoiding deformation and extending the service life of the roadbed.

[0013] 2. By setting spiral patterns and reinforcement components, this utility model can increase the contact area and friction between the heat pipe and the surrounding soil, achieve step-by-step embedding, enhance the overall reinforcement effect, suppress uneven settlement and lateral slippage caused by freeze-thaw cycles, and improve the long-term stability of the roadbed. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the anti-deformation reinforcement structure for roadbed in high-altitude and cold regions according to an embodiment of the present utility model; Figure 2 This is a cross-sectional view of a freeze-thaw cycle roadbed deformation prevention and reinforcement structure in high-altitude and cold regions according to an embodiment of the present utility model; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram of the heat pipe in the freeze-thaw cycle roadbed deformation prevention and reinforcement structure in high-altitude and cold regions according to an embodiment of the present utility model.

[0016] In the picture: 1. Subgrade foundation layer; 2. Concrete layer; 3. Asphalt layer; 4. Reinforcement layer; 5. Drainage components; 501. Drainage channel; 502. Drainage trough; 6. Heat pipe; 601. Liquid nitrogen; 602. Heat sink; 603. Spiral pattern; 604. Reinforcement components; 7. Geotextile layer; 8. CFG pile. Detailed Implementation

[0017] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0018] According to an embodiment of this utility model, a deformation-resistant reinforcement structure for roadbeds in high-altitude and cold regions based on freeze-thaw cycles is provided.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-4 As shown, the freeze-thaw cycle roadbed deformation prevention and reinforcement structure according to an embodiment of the present invention includes: a roadbed foundation layer 1; a concrete layer 2 disposed at the top of the roadbed foundation layer 1; an asphalt layer 3 disposed at the top of the concrete layer 2; a reinforcement layer 4 symmetrically disposed on both sides of the concrete layer 2; a drainage component 5 disposed at the bottom of the reinforcement layer 4 and cooperating with the roadbed foundation layer 1; and heat pipes 6 uniformly disposed on both sides of the top of the roadbed foundation layer 1.

[0020] By employing the above-mentioned technical solution of this utility model, a heat pipe 6 is installed, utilizing the freeze-thaw cycle of internal liquid nitrogen 601 to dissipate heat in winter, lowering the roadbed temperature and preventing frost heave and thaw settlement; in summer, it blocks the inflow of external heat, maintaining the long-term freezing of the roadbed foundation layer 1, avoiding deformation, and extending the service life of the roadbed. By setting the spiral pattern 603 and the reinforcement component 604, the contact area and friction between the heat pipe 6 and the surrounding soil can be increased, achieving step-by-step embedding, enhancing the overall reinforcement effect, suppressing uneven settlement and lateral slippage caused by freeze-thaw cycles, and improving the long-term stability of the roadbed.

[0021] In one embodiment, for the aforementioned subgrade foundation layer 1, the top end of the subgrade foundation layer 1 and the bottom end of the concrete layer 2 are connected by a geotextile layer 7, and CFG piles 8 are installed through the geotextile layer 7. This improves the bond between the subgrade foundation layer 1 and the concrete layer 2 through the geotextile layer 7, preventing relative slippage between the soil and the superstructure. The CFG piles 8 further strengthen the compressive and shear resistance of the subgrade foundation layer 1, avoiding uneven expansion and settlement of the foundation caused by freeze-thaw cycles.

[0022] In one embodiment, the drainage component 5 includes a drainage channel 501 located at the bottom of the reinforcement layer 4 and the drainage channel 501 is located at the top of the subgrade foundation layer 1. A drainage groove 502 is provided at the top of the drainage channel 501, which effectively collects the water on the surface of the asphalt layer 3 and drains it quickly, preventing water infiltration that could cause the foundation to soften and ensuring the structural stability of the subgrade foundation layer 1.

[0023] In one embodiment, the heat pipe 6 is a hollow structure, and liquid nitrogen 601 is installed inside the heat pipe 6. Several heat dissipation fins 602 are provided on the top of the outer circumference of the heat pipe 6, spiral patterns 603 are provided on the bottom of the outer circumference of the heat pipe 6, and a reinforcement 604 is provided on the bottom of the heat pipe 6. This can effectively maintain the frozen state of the roadbed foundation layer 1 in winter, prevent frost heave and thaw settlement, and block heat transmission in summer to prevent the roadbed foundation layer 1 from melting, thus ensuring the long-term stability of the roadbed.

[0024] In one embodiment, the spiral pattern 603 is an equidistant spiral structure, which increases the contact area and friction between the heat pipe 6 and the roadbed foundation layer 1, thereby improving the lateral pull-out resistance and overall stability of the heat pipe 6.

[0025] In one embodiment, the reinforcement 604 is a continuous cone structure with a stepped decrease in diameter of the cone cross section, thereby enhancing the stepwise embedding between the heat pipe 6 and the roadbed foundation layer 1, increasing the contact area and lateral resistance, and improving the pull-out and shear resistance.

[0026] The working principle of heat pipe 6 is as follows: During winter operation, liquid nitrogen 601 in heat pipe 6 absorbs heat from the roadbed foundation layer 1 and vaporizes at the bottom of heat pipe 6. The vaporized gas rises along heat pipe 6 to the top and condenses into liquid upon contact with cold air, flowing back to the bottom of heat pipe 6 to form a closed natural circulation system. This thermal circulation process continuously absorbs and transfers heat from the roadbed foundation layer 1, reducing the temperature of the roadbed foundation layer 1 and thus maintaining its frozen state and structural strength. At the same time, heat pipe 6 has unidirectional thermal conductivity, which can effectively block the downward conduction of heat from the atmosphere in summer, preventing the roadbed foundation layer 1 from melting and sinking due to high temperature, and effectively preventing roadbed deformation.

[0027] It should be further explained that the subgrade foundation layer 1 is the main part of the highway subgrade, usually composed of natural soil, crushed stone, gravel, or mixed materials. Its main function is to provide stable support for the superstructure, while also sharing vehicle loads to ensure the pavement's load-bearing capacity and durability. The concrete layer 2 is part of the subgrade structure, typically used to enhance the subgrade's load-bearing capacity, compressive strength, and overall stability, especially in soft or unstable soil conditions. It also protects the underlying materials from external environmental influences (such as moisture penetration). The asphalt layer 3, usually asphalt concrete, is the surface layer of the pavement, providing protection and ensuring the lane is smooth, comfortable, durable, and able to withstand daily traffic loads. The stabilizing layer 4 is used to enhance the bearing capacity and frost heave resistance of the roadbed, especially in soft soil or cold regions. This layer often improves the stability of the roadbed by adding special materials or structures (such as granular soil, chemical curing agents, etc.). The geotextile layer 7 is usually used between the roadbed layers to isolate, reinforce, and drain the soil, prevent the mixing of different materials, reduce soil erosion, maintain structural stability, and keep the soil dry through permeability to avoid water accumulation. CFG piles 8 (cement fly ash gravel piles) are used to reinforce the foundation, especially in soft foundations or cold regions. By setting CFG piles in the foundation, the bearing capacity and stability of the roadbed can be significantly improved, and settlement and deformation caused by freeze-thaw action can be suppressed.

[0028] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0029] In practical applications, drainage channels 502 can quickly drain water from the surface of the asphalt layer 3, preventing water infiltration and subsequent soil softening, thus ensuring the structural stability of the subgrade foundation layer 1. Geotextile layer 7 is placed between the subgrade foundation layer 1 and the concrete layer 2 to enhance the bond between them and prevent relative slippage between the soil and the superstructure. CFG piles 8 further strengthen the compressive and shear strength of the subgrade foundation layer 1, preventing uneven expansion and settlement of the foundation due to freeze-thaw cycles. Heat pipe 6 actively conducts heat in winter through the freeze-thaw cycle of internal liquid nitrogen 601 to lower the subgrade temperature and maintain its frozen state, preventing freezing. The expansion and thawing mechanism, in summer, blocks the ingress of external heat, keeping the foundation layer 1 of the roadbed stable and frozen, and preventing ground settlement caused by thawing. Among them, the spiral pattern 603 adopts an equidistant spiral arrangement, which increases the contact area and friction between the heat pipe 6 and the surrounding soil, improves the lateral pull-out resistance and overall stability of the heat pipe 6, and at the same time helps to transfer and disperse loads, improving the resistance to deformation. The reinforcement component 604 is a continuous conical structure, which can realize the step-by-step embedding of the heat pipe 6 into the surrounding soil, further increasing the lateral resistance and shear strength, strengthening the overall reinforcement effect, preventing uneven settlement and slippage caused by freeze-thaw action, and improving the long-term stability of the roadbed.

[0030] In summary, by utilizing the above-mentioned technical solution of this utility model, the heat pipe 6, through the freeze-thaw cycle of the internal liquid nitrogen 601, lowers the roadbed temperature by dissipating heat in winter, preventing frost heave and thaw settlement; in summer, it blocks the inflow of external heat, maintaining the long-term freezing of the roadbed foundation layer 1, avoiding deformation, and extending the service life of the roadbed. By incorporating the spiral pattern 603 and the reinforcement member 604, the contact area and friction between the heat pipe 6 and the surrounding soil can be increased, achieving step-by-step embedding, enhancing the overall reinforcement effect, suppressing uneven settlement and lateral slippage caused by freeze-thaw cycles, and improving the long-term stability of the roadbed.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] 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 freeze-thaw cycle roadbed deformation prevention and reinforcement structure for high-altitude and cold regions, characterized in that, include: Roadbed foundation layer (1); A concrete layer (2) is placed on top of the roadbed foundation layer (1); An asphalt layer (3) is provided on top of the concrete layer (2); A reinforcing layer (4) is symmetrically arranged on both sides of the concrete layer (2); A drainage component (5) is disposed at the bottom end of the reinforcement layer (4) and cooperates with the roadbed foundation layer (1); Heat pipes (6) are evenly arranged on both sides of the top of the roadbed foundation layer (1).

2. The anti-deformation reinforcement structure for roadbeds in high-altitude and cold regions according to claim 1, characterized in that, The top of the roadbed foundation layer (1) and the bottom of the concrete layer (2) are connected by a geotextile layer (7), and the geotextile layer (7) is provided with CFG piles (8).

3. The anti-deformation reinforcement structure for roadbeds in high-altitude and cold regions according to claim 1, characterized in that, The drainage component (5) includes a drainage channel (501) disposed at the bottom of the reinforcement layer (4), and the drainage channel (501) is located at the top of the roadbed foundation layer (1), and a drainage groove (502) is provided at the top of the drainage channel (501).

4. The anti-deformation reinforcement structure for roadbeds in high-altitude and cold regions according to claim 1, characterized in that, The heat pipe (6) has a hollow structure, and liquid nitrogen (601) is installed inside the heat pipe (6).

5. The anti-deformation reinforcement structure for roadbeds in high-altitude and cold regions according to claim 4, characterized in that, The top of the outer circumference of the heat rod (6) is provided with several heat sinks (602), the bottom of the outer circumference of the heat rod (6) is provided with spiral patterns (603), and the bottom of the heat rod (6) is provided with a reinforcing member (604).

6. The anti-deformation reinforcement structure for roadbeds in high-altitude and cold regions according to claim 5, characterized in that, The spiral pattern (603) has an equidistant spiral structure.

7. The freeze-thaw cycle roadbed deformation prevention and reinforcement structure for high-altitude and cold regions according to claim 6, characterized in that, The reinforcement (604) is a continuous vertebral structure, and the diameter of the vertebral cross section decreases in a stepwise manner.

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