A highway pavement heat insulation structure suitable for high-cold regions

Abstract

The utility model provides a kind of highway pavement heat insulation structure suitable for alpine region belongs to highway engineering field, including roadbed;Heat insulation layer is laid on the roadbed upper, the heat insulation layer includes by lower to upper sequentially arranged bottom layer heat insulation material layer, middle aerogel felt layer and upper layer waterproof air-permeable membrane layer, the bottom layer heat insulation material layer uses rigid polyurethane foam;Base layer is laid on the heat insulation layer upper;Surface layer is laid on the base layer upper.The utility model passes through using multilayer heat insulation structure, wherein the composite structure of bottom layer heat insulation material layer, middle aerogel felt layer and upper layer waterproof air-permeable membrane layer, effectively reduce the transfer between roadbed and external environment with heat.Rigid polyurethane foam and aerogel felt's low thermal conductivity, ensure the high efficiency of heat insulation effect.

Description

Technical Field

[0001] This utility model relates to the field of highway engineering, and more specifically, to a heat insulation structure for highway pavement suitable for high-altitude and cold regions. Background Technology

[0002] In high-altitude and frigid regions, highways face extremely harsh natural environmental challenges. Due to extremely low winter temperatures and large diurnal temperature variations, highways are not only affected by persistently low temperatures but also experience frequent freeze-thaw cycles. These extreme temperature changes cause repeated freezing and thawing of moisture in the roadbed and pavement structure, leading to frost heave (swelling of the roadbed) and damage to the pavement structure. Furthermore, snow and ice cover is also a common problem for highways in high-altitude and frigid regions. The accumulation of snow and ice further reduces the road surface's frost resistance, increases its brittleness, and makes it more prone to cracking and frost heaving.

[0003] These problems not only severely impact the service life of highways but also pose a serious threat to driving safety. For example, frost heave can cause uneven road surfaces, increasing the bumpy ride and potentially leading to traffic accidents; cracks further damage the integrity of the pavement structure, accelerating aging and deterioration. Although existing highway pavement structures incorporate certain anti-freezing measures during design and construction, these measures are often insufficient to effectively cope with such frequent and drastic temperature changes and the effects of snow and ice cover in the special environment of high-altitude and cold regions.

[0004] Therefore, in order to improve the durability and stability of highways in high-altitude and cold regions and ensure the normal use and driving safety of highways in harsh environments, there is an urgent need for a new type of thermal insulation structure. Utility Model Content

[0005] The purpose of this utility model is to provide a heat insulation structure for highway pavement in cold regions, which can effectively reduce the heat exchange between the roadbed and the external environment, prevent the roadbed from freezing heave and freeze-thaw cycles from damaging the pavement, thereby extending the service life of the highway and improving driving safety.

[0006] The embodiments of this utility model are achieved through the following technical solution: a heat insulation structure for highway pavement suitable for cold regions, comprising:

[0007] Roadbed;

[0008] The thermal insulation layer laid on the roadbed includes a bottom thermal insulation material layer, an intermediate aerogel felt layer and an upper waterproof and breathable membrane layer arranged sequentially from bottom to top. The bottom thermal insulation material layer is made of rigid polyurethane foam.

[0009] The base layer laid on top of the thermal insulation layer;

[0010] The surface layer laid on top of the base layer.

[0011] Furthermore, the thermal insulation layer is provided with spaced thermal insulation support columns, which are made of high-strength polystyrene foam and filled with phase change material.

[0012] Furthermore, an anti-frost heave material layer is provided between the roadbed and the heat insulation layer, and the anti-frost heave material layer is made of expanded polystyrene board material.

[0013] Furthermore, a stress-absorbing layer is provided between the base layer and the surface layer, and the stress-absorbing layer is made of modified rubber asphalt.

[0014] Furthermore, the surface of the top layer is also provided with an anti-icing coating, which is made of silicone-modified epoxy resin material.

[0015] Furthermore, it also includes a drainage assembly, which includes drainage ditches disposed on both sides of the roadbed and a transverse drainage pipe disposed between the thermal insulation layer and the base layer, wherein the outlet end of the transverse drainage pipe is connected to the drainage ditch.

[0016] Furthermore, a sealing strip is provided at the edge of the heat insulation layer, and the sealing strip is made of low-temperature resistant elastic rubber material.

[0017] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0018] 1. This utility model employs a multi-layer thermal insulation structure. The bottom insulation layer possesses excellent thermal insulation performance, effectively reducing heat transfer between the roadbed and the external environment, mitigating the impact of low winter temperatures on the roadbed, and preventing frost heave caused by excessively low roadbed temperatures. The middle aerogel felt layer is a novel inorganic insulation material with extremely low thermal conductivity, further enhancing the insulation effect. Its unique nanoporous structure effectively prevents heat conduction, significantly improving thermal insulation performance and providing more reliable temperature protection for the roadbed. The upper waterproof and breathable membrane layer not only prevents moisture penetration, avoiding roadbed dampness, but also allows water vapor to escape, preventing internal water accumulation. This waterproof and breathable characteristic helps maintain the dry state of the thermal insulation layer, ensuring that the performance of the insulation material is not affected by moisture, thereby extending the durability of the thermal insulation effect.

[0019] 2. This utility model, by setting up heat-insulating support columns made of high-strength polystyrene foam, has good heat insulation performance and high mechanical strength; the phase change material filled inside the heat-insulating support columns can absorb or release heat when the temperature changes, playing a role in regulating the temperature; it not only enhances the overall structural stability of the heat insulation layer, but also automatically regulates the heat when the temperature fluctuates, further stabilizing the roadbed temperature and reducing the damage to the roadbed caused by frost heave and freeze-thaw cycles.

[0020] 3. By setting an anti-frost heave material layer, this utility model can effectively alleviate the impact of frost heave on the roadbed, prevent the roadbed from deforming due to frost heave in winter, significantly reduce the damage of frost heave to the roadbed, and extend the service life of the highway. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle.

[0024] Icons: 10. Roadbed; 11. Anti-frost heave material layer; 12. Bottom insulation material layer; 121. Anti-corrosion coating; 13. Intermediate aerogel felt layer; 14. Upper waterproof and breathable membrane layer; 15. Insulation support column; 16. Sealing strip; 17. Drainage ditch; 18. Horizontal drainage pipe; 20. Base layer; 21. Stress absorption layer; 30. Surface layer; 31. Anti-icing coating. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Example

[0028] The following detailed embodiments further illustrate that this invention is a thermal insulation structure for highway pavements in cold regions. Figure 1 This includes the roadbed 10, which serves as the foundation of the entire highway, bearing the weight of the superstructure and transferring it to the ground.

[0029] Reference Figure 1 A frost-resistant material layer 11 is installed on top of the roadbed 10. The frost-resistant material layer 11 is made of expanded polystyrene board (EPS) material with a thickness of 3-5 cm. Expanded polystyrene board (EPS) material has the characteristics of low density, high strength and good thermal insulation performance, which can effectively alleviate the impact of frost heave on the roadbed 10 and prevent the roadbed 10 from deforming due to frost heave in winter.

[0030] Reference Figure 1 and Figure 2 The thermal insulation layer is laid on top of the frost-resistant material layer 11. The thermal insulation layer includes a bottom thermal insulation material layer 12, an intermediate aerogel felt layer 13, and an upper waterproof and breathable membrane layer 14. The bottom thermal insulation material layer 12 is made of rigid polyurethane foam, with a thickness of 5-10 cm, and has good thermal insulation performance. An anti-corrosion coating 121, made of epoxy zinc-rich paint, with a thickness of 0.1-0.3 mm, is also applied to the surface of the bottom thermal insulation layer 12 to prevent corrosion during long-term use. The intermediate aerogel felt layer 13 is 3-5 cm thick. Aerogel felt is a new type of inorganic thermal insulation material with low thermal conductivity and excellent thermal insulation performance. The upper waterproof and breathable membrane layer 14 is 0.5-1 cm thick and is used to prevent moisture penetration while allowing water vapor to escape, preventing internal water accumulation.

[0031] Reference Figure 1 The thermal insulation layer also includes spaced-out thermal insulation support columns 15. These columns are made of high-strength polystyrene foam and filled with a phase change material. The diameter of each support column is 10-15 cm, and its height is the same as the thickness of the thermal insulation layer. The phase change material has a phase change temperature of -5℃ to 5℃, enabling it to absorb or release heat during temperature changes, further stabilizing the temperature of the roadbed 10.

[0032] A sealing strip 16 is provided at the edge of the thermal insulation layer. The sealing strip 16 is made of low-temperature resistant elastic rubber material, which can prevent external moisture and cold air from seeping into the interior of the thermal insulation layer from the edge. The design of the sealing strip 16 effectively avoids heat loss and moisture intrusion, thus enhancing the thermal insulation effect.

[0033] Reference Figure 1 The thermal insulation structure also includes a drainage system, which consists of drainage ditches 17 installed on both sides of the roadbed and transverse drainage pipes 18 installed between the thermal insulation layer and the base layer 20. The bottom of the drainage ditches 17 is laid with permeable geotextile, and the transverse drainage pipes 18 are made of high-density polyethylene with a diameter of 10-15 cm. A drainage outlet is installed every 5-10 meters and connected to the drainage ditch 17. The drainage system can promptly drain moisture from the roadbed 10, preventing moisture accumulation that could lead to frost heave and freeze-thaw cycles damaging the roadbed 10.

[0034] Reference Figure 1 The base layer 20 is laid on top of the thermal insulation layer. The base layer 20 is made of cement-stabilized crushed stone and has a thickness of 20-30 cm. It serves to bear and distribute the load. A stress-absorbing layer 21 is installed on top of the base layer 20. The stress-absorbing layer 21 is made of modified rubber asphalt and has a thickness of 1-2 cm. It is used to absorb the stress generated by vehicle loads and prevent cracks from reflecting to the surface layer.

[0035] Reference Figure 1 The surface layer 30 is laid on top of the base layer 20 and is made of modified asphalt concrete. This modified asphalt concrete incorporates anti-stripping agents and anti-skid particles, and its surface has a micro-textured structure. The anti-stripping agent accounts for 0.5%-1.5% of the mass of the modified asphalt concrete, the anti-skid particles have a particle size of 2-5 mm, and the micro-texture depth is 0.5-1 mm. This improves the road surface's anti-skid performance and wear resistance, making it suitable for the special driving needs of cold-climate regions.

[0036] Reference Figure 1 The surface layer 30 is also provided with an anti-icing coating 31. The anti-icing coating 31 is made of silicone-modified epoxy resin material with a thickness of 0.2-0.5 mm. It can reduce the adhesion between ice and snow and the road surface, making it easier for snow removal operations in winter. The anti-icing coating 31 can still maintain good performance at low temperatures, effectively reducing the adhesion of ice and snow to the road surface and reducing the difficulty of snow removal.

[0037] The working process of this embodiment is as follows:

[0038] During construction, the roadbed 10 is laid first, followed by the frost-resistant material layer 11, the thermal insulation layer, the base layer 20, and the surface layer 30. Thermal insulation support columns 15 are embedded during the laying of the thermal insulation layer, and drainage pipes 18 are laid between the thermal insulation layer and the base layer. Each layer should be tightly fitted together to ensure construction quality.

[0039] During use, the thermal insulation layer, through its composite structure of rigid polyurethane foam, aerogel felt, and waterproof and breathable membrane, effectively reduces heat exchange between the roadbed 10 and the external environment, preventing frost heave caused by excessively low temperatures. The thermal insulation support column 15 and phase change material further enhance the thermal insulation effect. The drainage system can promptly drain moisture from the roadbed 10, preventing moisture accumulation that could lead to frost heave and damage from freeze-thaw cycles. The stress-absorbing layer 21 absorbs stress generated by vehicle loads, preventing cracks from reflecting to the surface layer. The anti-icing coating 31 reduces the adhesion of ice and snow to the road surface, facilitating snow removal operations in winter.

[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A thermal insulation structure for highway pavement suitable for high-altitude and cold regions, characterized in that, include: Roadbed (10); The heat insulation layer laid on the roadbed (10) includes a bottom heat insulation material layer (12), an intermediate aerogel felt layer (13) and an upper waterproof and breathable membrane layer (14) arranged from bottom to top. The bottom heat insulation material layer (12) is made of rigid polyurethane foam. The base layer (20) laid on top of the thermal insulation layer; The surface layer (30) is laid on top of the base layer (20).

2. The thermal insulation structure for highway pavement in cold regions according to claim 1, characterized in that: The thermal insulation layer is provided with spaced thermal insulation support columns (15), the thermal insulation support columns (15) are made of high-strength polystyrene foam, and the interior of the thermal insulation support columns (15) is filled with phase change material.

3. The thermal insulation structure for highway pavement in cold regions according to claim 1, characterized in that: A layer of anti-freeze-swelling material (11) is provided between the roadbed (10) and the heat insulation layer, and the anti-freeze-swelling material layer (11) is made of expanded polystyrene board material.

4. A thermal insulation structure for highway pavement in cold regions according to claim 1, characterized in that: A stress-absorbing layer (21) is also provided between the base layer (20) and the surface layer (30), and the stress-absorbing layer (21) is made of modified rubber asphalt.

5. A thermal insulation structure for highway pavement in cold regions according to claim 1, characterized in that: The surface of the surface layer (30) is also provided with an anti-icing coating (31), which is made of silicone-modified epoxy resin material.

6. A thermal insulation structure for highway pavement in cold regions according to claim 1, characterized in that: It also includes a drainage assembly, which includes drainage ditches (17) set on both sides of the roadbed (10) and a transverse drainage pipe (18) set between the heat insulation layer and the base layer (20), with the outlet end of the transverse drainage pipe (18) connected to the drainage ditch (17).

7. A thermal insulation structure for highway pavement in cold regions according to claim 1, characterized in that: The edge of the heat insulation layer is provided with a sealing strip (16), and the sealing strip (16) is made of low-temperature resistant elastic rubber material.

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