Combined frozen soil protection roadbed structure

Abstract

The invention relates to the field of road foundations, in particular to a combined frozen soil protection roadbed structure which comprises a surface layer, a functional layer is arranged at the bottom of the surface layer, a roadbed layer is arranged at the bottom of the functional layer, and a plurality of ventilation pipe assemblies are arranged in the roadbed layer at equal intervals. The functional layer comprises an upper rubble layer and a lower rubble layer, the upper rubble layer is arranged at the bottom of the surface layer, the lower rubble layer is arranged at the top of the roadbed layer, two layers of waterproof geotechnical cloth are arranged between the upper rubble layer and the lower rubble layer, and self-adhesive rubber asphalt is arranged between the two layers of waterproof geotechnical cloth. The upper rubble layer and the lower rubble layer are both made of granite pieces, so that the effects of improving heat dissipation and heat insulation performance and effectively reducing freeze thawing settlement and other disease risks caused by temperature changes are achieved, and the granite granite heat insulation plate has high practical value.

Description

Technical Field

[0001] This application relates to the field of road foundations, and particularly to a combined frozen soil protection subgrade structure. Background Art

[0002] Frozen soil refers to soil containing ice, which will experience significant volume changes during the freezing in winter and melting in summer. This may cause ground settlement, heaving or other deformations, thereby affecting the safety of infrastructure such as buildings and roads. The frozen soil protection subgrade structure is a special road infrastructure designed specifically for cold regions (such as high-latitude or alpine areas), aiming to prevent or mitigate the foundation instability and pavement damage caused by seasonal freeze-thaw cycles. This structure enhances the stability and durability of the subgrade by comprehensively applying a variety of technologies and materials, while reducing the impact on the surrounding natural environment.

[0003] The existing frozen soil protection subgrade structures usually use a single layer of rubble subgrade, and the heat dissipation performance is relatively limited, which cannot well protect the permafrost layer, affects the subgrade stability and is not convenient to use. Summary of the Invention

[0004] This application provides a combined frozen soil protection subgrade structure to solve the problems raised in the above background art.

[0005] The above technical objectives of this application are achieved through the following technical solutions: A combined frozen soil protection subgrade structure includes a surface layer. A functional layer is provided at the bottom of the surface layer, a subgrade layer is provided at the bottom of the functional layer, and a number of ventilation pipe assemblies are provided inside the subgrade layer. The ventilation pipe assemblies are arranged at equal intervals. The functional layer includes an upper rubble layer and a lower rubble layer. The upper rubble layer is provided at the bottom of the surface layer, and the lower rubble layer is provided at the top of the subgrade layer. A waterproof geotextile is provided between the upper rubble layer and the lower rubble layer. There are two layers of the waterproof geotextile, and self-adhesive rubber asphalt is provided between the two layers of the waterproof geotextile. The materials of the upper rubble layer and the lower rubble layer are both granite chips.

[0006] By adopting the above solution, through the setting of the ventilation pipe assembly and the functional layer, it is convenient to improve the protection of the permafrost layer, reduce the foundation instability and pavement damage caused by seasonal freeze-thaw cycles. By providing a waterproof geotextile between the upper crushed stone layer and the lower crushed stone layer, it is convenient for the upper crushed stone layer to effectively block the heat conducted downward from the surface layer. In summer, it can accelerate the heat dissipation of the surface layer. The waterproof geotextile can further play a role in heat insulation, making the heat transferred downward from the surface layer mainly concentrated in the upper crushed stone layer for heat dissipation. Moreover, the waterproof geotextile has a waterproof function and can effectively prevent the conduction of water and heat to the deep layer of the subgrade structure. The lower crushed stone layer can further play a role in ventilation and heat dissipation, and can better protect the stability of the frozen soil. By providing two layers of waterproof geotextile and providing self-adhesive rubber asphalt between the two layers of waterproof geotextile, it is convenient to enhance the waterproof performance and heat insulation performance of the waterproof geotextile, and can improve the anti-peeling and anti-tearing performance of the waterproof geotextile. By the materials of the upper crushed stone layer and the lower crushed stone layer being granite chips, the granite chips have a high hardness, thus improving the compressive strength of the upper crushed stone layer and the lower crushed stone layer. The gaps between the chips are large, which is conducive to the discharge of water and can form a natural ventilation channel.

[0007] Further, the subgrade layer includes a permafrost layer, and a base layer is provided on the top of the permafrost layer.

[0008] By adopting the above solution, by providing a base layer on the top of the permafrost layer, it is convenient for the base layer to provide a stable bearing platform for the subgrade structure, improve the overall stability and durability, and facilitate the protection of the bottom permafrost layer.

[0009] Further, the material of the base layer includes natural gravel, graded crushed stone and lime stabilized soil, and the base layer is provided at the bottom of the lower crushed stone layer.

[0010] By adopting the above solution, by the material of the base layer including natural gravel, graded crushed stone and lime stabilized soil, it is convenient to improve the bearing capacity, drainage performance and thermal stability of the base layer.

[0011] Further, the ventilation pipe assembly includes a horizontal pipe, and the horizontal pipe is arranged inside the permafrost layer.

[0012] By adopting the above solution, by arranging the horizontal pipe inside the permafrost layer, it is convenient for the air inside the horizontal pipe to absorb the temperature of the permafrost soil layer, which is beneficial to improving the stability of the permafrost layer.

[0013] Further, both ends of the horizontal pipe are connected to a vertical pipe, and the vertical pipe extends upward and passes through the side of the base layer.

[0014] By adopting the above solution, by the vertical pipe extending upward and passing through the side of the base layer, it is convenient to form a chimney effect, discharge the air absorbed with heat from the horizontal pipe, thereby improving the stability of the permafrost layer.

[0015] Further, a wind cap is provided at one end of the vertical pipe away from the horizontal pipe. An interface is fixedly installed on one side of the wind cap. The interface is arranged inside the vertical pipe, and the interface is snap-fitted with the vertical pipe.

[0016] By adopting the above scheme, since the interface is arranged inside the vertical pipe and the interface is snap-fitted with the vertical pipe, it is convenient to install and fix the wind cap to the vertical pipe.

[0017] Further, an air outlet is opened at the bottom of the side of the wind cap away from the interface, and a blocking net is fixedly installed inside the wind cap.

[0018] By adopting the above scheme, since an air outlet is opened at the bottom of the side of the wind cap away from the interface and a blocking net is fixedly installed inside the wind cap, it is convenient to block external rainwater, dust and organisms from entering the inside of the vertical pipe, avoiding the influence on the exhaust effect.

[0019] Further, the surface layer includes ordinary asphalt concrete. The ordinary asphalt concrete is arranged on the top of the upper crushed stone layer, and modified asphalt concrete is provided on the top of the ordinary asphalt concrete.

[0020] By adopting the above scheme, since the ordinary asphalt concrete is arranged on the top of the upper crushed stone layer and the modified asphalt concrete is provided on the top of the ordinary asphalt concrete, the modified asphalt concrete has high hardness and wear resistance, which is convenient for the modified asphalt concrete to directly bear the vehicle load, provide friction to ensure driving safety, and resist external factors such as ultraviolet rays and water damage, improving the service life. The ordinary asphalt concrete plays a role in transmitting and dispersing the stress from the modified asphalt concrete and at the same time plays a certain waterproofing role.

[0021] In summary, the present application has the following technical effects: Through the settings of the ventilation pipe assembly and the functional layer, it is convenient to improve the protection of the permafrost layer, reduce the foundation instability and pavement damage caused by seasonal freeze-thaw cycles. By arranging a waterproof geotextile between the upper crushed stone layer and the lower crushed stone layer, it is convenient for the upper crushed stone layer to effectively block the heat conducted downward from the surface layer. In summer, it can accelerate the heat dissipation of the surface layer. The waterproof geotextile can further play a role in heat preservation and insulation, so that the heat transferred downward from the surface layer is mainly concentrated in the upper crushed stone layer for heat dissipation. And the waterproof geotextile has a waterproof function, which can effectively prevent the conduction of water and heat to the deep layer of the subgrade structure. The lower crushed stone layer can further play a role in ventilation and heat dissipation, and can better protect the stability of the frozen soil. By arranging two layers of waterproof geotextiles and self-adhesive rubber asphalt between the two layers of waterproof geotextiles, it is convenient to enhance the waterproof performance and heat insulation performance of the waterproof geotextile, and can improve the anti-peeling and anti-tearing performance of the waterproof geotextile. By using granite chips as the materials of the upper crushed stone layer and the lower crushed stone layer, the granite chips have a high hardness, thus improving the compressive strength of the upper crushed stone layer and the lower crushed stone layer. The gaps between the chips are relatively large, which is beneficial to the discharge of water and can form a natural ventilation channel, achieving the effects of improving heat dissipation and heat insulation performance, and effectively reducing the risk of diseases such as freeze-thaw settlement caused by temperature changes, and has high practical value. Brief Description of the Drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of a combined frozen soil protection subgrade structure of the present application; Figure 2 is a sectional view of a combined frozen soil protection subgrade structure of the present application; Figure 3 is a sectional view of the functional layer of the present application; Figure 4 is a partial exploded view of the ventilation pipe assembly of the present application; Figure 5 is a three-dimensional structural schematic diagram of the wind cap of the present application.

[0023] In the figure, 1, surface layer; 11, ordinary asphalt concrete; 12, modified asphalt concrete; 2, functional layer; 21, upper crushed stone layer; 22, lower crushed stone layer; 23, waterproof geotextile; 24, self-adhesive rubber asphalt; 3, subgrade layer; 31, base course; 32, permafrost layer; 4, ventilation pipe assembly; 41, horizontal pipe; 42, vertical pipe; 43, wind cap; 44, interface; 45, air outlet; 46, blocking net. Detailed Description of the Embodiment

[0024] The following further details the present application with reference to the accompanying drawings. Embodiment

[0025] As shown in the attached Figure 1 to the attached Figure 5 figures: The present invention provides a combined frozen soil protection subgrade structure, which combines Figure 1 and Figure 2 , the subgrade structure includes a surface layer 1, a functional layer 2 is provided at the bottom of the surface layer 1, a roadbed layer 3 is provided at the bottom of the functional layer 2, and a plurality of ventilation pipe assemblies 4 are arranged inside the roadbed layer 3 at equal intervals. Through the arrangement of the ventilation pipe assemblies 4 and the functional layer 2, it is convenient to improve the protection of the permafrost layer 32 and reduce the foundation instability and pavement damage caused by seasonal freeze-thaw cycles.

[0026] Referring to Figure 3 , the functional layer 2 includes an upper crushed stone layer 21 and a lower crushed stone layer 22. The upper crushed stone layer 21 is arranged at the bottom of the surface layer 1, and the lower crushed stone layer 22 is arranged at the top of the roadbed layer 3. A waterproof geotextile 23 is provided between the upper crushed stone layer 21 and the lower crushed stone layer 22. By providing the waterproof geotextile 23 between the upper crushed stone layer 21 and the lower crushed stone layer 22, it is convenient for the upper crushed stone layer 21 to effectively block the heat conducted downward from the surface layer 1. In summer, it can accelerate the heat dissipation of the surface layer 1. The waterproof geotextile 23 can further play a role in heat preservation and insulation, so that the heat transmitted downward from the surface layer 1 is mainly concentrated in the upper crushed stone layer 21 for heat dissipation. Moreover, the waterproof geotextile 23 has a waterproof function and can effectively prevent water and heat from conducting deep into the subgrade structure. The lower crushed stone layer 22 can further play a role in ventilation and heat dissipation and can better protect the stability of the frozen soil. The waterproof geotextile 23 is provided with two layers, and a self-adhesive rubber asphalt 24 is provided between the two layers of waterproof geotextile 23. By providing the waterproof geotextile 23 with two layers and providing the self-adhesive rubber asphalt 24 between the two layers of waterproof geotextile 23, it is convenient to enhance the waterproof performance and heat insulation performance of the waterproof geotextile 23, and can improve the anti-peeling and anti-tearing performance of the waterproof geotextile 23. The materials of the upper crushed stone layer 21 and the lower crushed stone layer 22 are both granite chips. By the materials of the upper crushed stone layer 21 and the lower crushed stone layer 22 being both granite chips, the granite chips have a relatively high hardness, thereby improving the compressive strength of the upper crushed stone layer 21 and the lower crushed stone layer 22. The gaps between the chips are relatively large, which is beneficial to the discharge of water and can form a natural ventilation channel.

[0027] Referring to Figure 1 , the roadbed layer 3 includes a permafrost layer 32, and a base layer 31 is provided at the top of the permafrost layer 32. By providing the base layer 31 at the top of the permafrost layer 32, it is convenient for the base layer 31 to provide a stable bearing platform for the subgrade structure, improve the overall stability and durability, and facilitate the protection of the bottom permafrost layer 32.

[0028] Among them, the material of the base layer 31 includes natural gravel, graded crushed stone and lime stabilized soil. The base layer 31 is arranged at the bottom of the lower crushed stone layer 22. By the material of the base layer 31 including natural gravel, graded crushed stone and lime stabilized soil, it is convenient to improve the bearing capacity, drainage performance and thermal stability of the base layer 31.

[0029] Referring toFigure 2 , the ventilation pipe assembly 4 includes a horizontal pipe 41. The horizontal pipe 41 is arranged inside the permafrost layer 32. By arranging the horizontal pipe 41 inside the permafrost layer 32, it is convenient for the air inside the horizontal pipe 41 to absorb the temperature of the soil layer of the permafrost layer 32, which is beneficial to improving the stability of the permafrost layer 32.

[0030] Refer to Figure 4 , both ends of the horizontal pipe 41 are communicated with vertical pipes 42. The vertical pipes 42 extend upward and penetrate out from the side of the base course 31. By extending the vertical pipes 42 upward and penetrating out from the side of the base course 31, it is convenient to form a chimney effect and discharge the air absorbed with heat from the horizontal pipe 41, thereby improving the stability of the permafrost layer 32.

[0031] One end of the vertical pipe 42 away from the horizontal pipe 41 is provided with a wind cap 43. One side of the wind cap 43 is fixedly installed with an interface 44. The interface 44 is arranged inside the vertical pipe 42, and the interface 44 is snap-connected with the vertical pipe 42. By arranging the interface 44 inside the vertical pipe 42 and the interface 44 being snap-connected with the vertical pipe 42, it is convenient to install and fix the wind cap 43 to the vertical pipe 42.

[0032] Refer to Figure 5 , an air outlet 45 is opened at the bottom of one side of the wind cap 43 away from the interface 44. A blocking net 46 is fixedly installed inside the wind cap 43. By opening the air outlet 45 at the bottom of one side of the wind cap 43 away from the interface 44 and fixedly installing the blocking net 46 inside the wind cap 43, it is convenient to block external rainwater, dust and organisms from entering the inside of the vertical pipe 42 and avoid affecting the exhaust effect.

[0033] Refer to Figure 1 , the surface layer 1 includes ordinary asphalt concrete 11. The ordinary asphalt concrete 11 is arranged on the top of the upper crushed stone layer 21. There is modified asphalt concrete 12 on the top of the ordinary asphalt concrete 11. By arranging the ordinary asphalt concrete 11 on the top of the upper crushed stone layer 21 and having the modified asphalt concrete 12 on the top of the ordinary asphalt concrete 11, the modified asphalt concrete 12 has high hardness and wear resistance, which is convenient for the modified asphalt concrete 12 to directly bear the vehicle load, provide friction to ensure driving safety, and resist external factors such as ultraviolet rays and water damage, improving the service life. The ordinary asphalt concrete 11 plays a role in transferring and dispersing the stress from the modified asphalt concrete 12 and also plays a certain waterproof role.

[0034] Specifically, a subbase layer 31 is provided at the top of the permafrost layer 32, which facilitates the subbase layer 31 to provide a stable bearing platform for the roadbed structure, improve the overall stability and durability, and facilitate the protection of the underlying permafrost layer 32. The material of the subbase layer 31 includes natural gravel, graded crushed stone, and lime stabilized soil, which facilitates the improvement of the bearing capacity, drainage performance, and thermal stability of the subbase layer 31. The horizontal pipe 41 is arranged inside the permafrost layer 32, which facilitates the air inside the horizontal pipe 41 to absorb the temperature of the soil layer of the permafrost layer 32, and is beneficial to improving the stability of the permafrost layer 32. The vertical pipe 42 extends upward and penetrates out from the side of the subbase layer 31, which facilitates the formation of a chimney effect and discharges the air absorbed with heat from the horizontal pipe 41, thereby improving the stability of the permafrost layer 32. The interface 44 is arranged inside the vertical pipe 42, and the interface 44 is snap-connected to the vertical pipe 42, which facilitates the installation and fixation of the wind cap 43 to the vertical pipe 42. An air outlet 45 is provided at the bottom of the side of the wind cap 43 away from the interface 44, and a blocking net 46 is fixedly installed inside the wind cap 43, which facilitates blocking external rainwater, dust, and organisms from entering the inside of the vertical pipe 42 and avoiding the influence on the exhaust effect. A waterproof geotextile 23 is provided between the upper stone layer 21 and the lower stone layer 22, which facilitates the upper stone layer 21 to effectively block the heat conducted downward from the surface layer. In summer, it can accelerate the heat dissipation of the surface layer 1. The waterproof geotextile 23 can further play a role in heat preservation and insulation, so that the heat transferred downward by the surface layer 1 is mainly concentrated in the upper stone layer 21 for heat dissipation. Moreover, the waterproof geotextile 23 has a waterproof function and can effectively prevent the conduction of water and heat to the deep layer of the roadbed structure. The lower stone layer 22 can further play a role in ventilation and heat dissipation and can better protect the stability of the frozen soil. The waterproof geotextile 23 is provided with two layers, and a self-adhesive rubber asphalt 24 is provided between the two layers of the waterproof geotextile 23, which facilitates enhancing the waterproof performance and heat insulation performance of the waterproof geotextile 23, and can improve the anti-peeling and anti-tearing performance of the waterproof geotextile 23. The materials of the upper stone layer 21 and the lower stone layer 22 are both granite flakes, and the granite flakes have a high hardness, thereby improving the compressive strength of the upper stone layer 21 and the lower stone layer 22. The gaps between the flakes are relatively large, which is beneficial to the discharge of water and can form a natural ventilation channel. Ordinary asphalt concrete 11 is arranged on the top of the upper stone layer 21, and modified asphalt concrete 12 is arranged on the top of the ordinary asphalt concrete 11. The modified asphalt concrete 12 has a high hardness and wear resistance, which facilitates the modified asphalt concrete 12 to directly bear the vehicle load, provide friction to ensure driving safety, and resist external factors such as ultraviolet rays and water damage, and improve the service life. The ordinary asphalt concrete 11 plays a role in transmitting and dispersing the stress from the modified asphalt concrete 12 and at the same time plays a certain waterproof role.

[0035] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A combined frozen soil protection roadbed structure, characterized in that: The invention comprises a surface layer (1), a functional layer (2) is provided at the bottom of the surface layer (1), a road base layer (3) is provided at the bottom of the functional layer (2), a plurality of ventilation pipe assemblies (4) are provided inside the road base layer (3), and the ventilation pipe assemblies (4) are arranged at equal intervals. The functional layer (2) comprises an upper stone layer (21) and a lower stone layer (22), the upper stone layer (21) is provided at the bottom of the surface layer (1), and the lower stone layer (22) is provided at the top of the road base layer (3). A waterproof geotextile (23) is provided between the upper stone layer (21) and the lower stone layer (22), the waterproof geotextile (23) comprises two layers, and a self-adhesive rubber asphalt (24) is provided between the two layers of the waterproof geotextile (23), and the upper stone layer (21) and the lower stone layer (22) are both made of granite flakes.

2. A combined frozen soil protection roadbed structure according to claim 1, characterized in that: The road base layer (3) comprises a permafrost layer (32), and a subbase layer (31) is provided on the top of the permafrost layer (32).

3. A combined frozen soil protection roadbed structure according to claim 2, characterized in that: The material of the subbase (31) includes natural gravel, graded crushed stone and lime-stabilized soil, and the subbase (31) is arranged at the bottom of the lower sheet stone layer (22).

4. The combined frozen soil protection roadbed structure according to claim 1, characterized in that: The ventilation pipe assembly (4) comprises a transverse pipe (41), and the transverse pipe (41) is arranged inside the permafrost layer (32).

5. The combined frozen soil protection roadbed structure according to claim 4 is characterized in that: Both ends of the horizontal tube (41) are connected to vertical tubes (42), and the vertical tubes (42) extend upward and pass through the side of the base layer (31).

6. The combined frozen soil protection roadbed structure according to claim 5, characterized in that: A hood (43) is provided at one end of the vertical pipe (42) away from the horizontal pipe (41); an interface (44) is fixedly mounted on one side of the hood (43); the interface (44) is arranged inside the vertical pipe (42), and the interface (44) is snap-fitted and connected to the vertical pipe (42).

7. The combined frozen soil protection roadbed structure according to claim 6, characterized in that: An air outlet (45) is provided at the bottom of the wind cap (43) on a side away from the interface (44), and a blocking net (46) is fixedly installed inside the wind cap (43).

8. The combined frozen soil protection roadbed structure according to claim 1, characterized in that: The surface layer (1) comprises ordinary asphalt concrete (11), the ordinary asphalt concrete (11) is arranged on the top of the upper stone layer (21), and modified asphalt concrete (12) is arranged on the top of the ordinary asphalt concrete (11).

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