A frozen soil roadbed heat insulation protection structure
By setting up a multi-layer thermal insulation and protection structure in the frozen soil subgrade, including thermal insulation layers, waterproof geotextiles and ventilation pipes, the instability problem of the frozen soil subgrade under seasonal freeze-thaw cycles is solved, and the stability and durability of the frozen soil subgrade are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY NO 10 ENG GRP CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-07-21
AI Technical Summary
Frozen soil subgrades are prone to foundation instability and pavement damage under seasonal freeze-thaw cycles, and existing technologies are insufficient to effectively protect the thermal stability of frozen soil.
The system employs a combination of thermal insulation layers, waterproof geotextiles, aerated concrete slabs, self-adhesive rubber asphalt, rubble layers, ventilation pipes, heat pipes, and insulation sleeves to form a multi-layered thermal insulation and protection system for frozen soil subgrade. This system blocks heat transfer, utilizes natural ventilation and wind pressure difference for cooling, and enhances waterproof and anti-peeling properties.
It improves the stability and service life of frozen soil subgrades, reduces the instability of the foundation caused by seasonal freeze-thaw cycles, enhances waterproof and tear-resistant properties, and ensures road safety and durability.
Smart Images
Figure CN224531369U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of frozen soil subgrade, in particular to a heat insulation protection structure for frozen soil subgrade. BACKGROUND
[0002] Frozen soil subgrade refers to the road foundation structure built in permafrost regions. Due to the special physical and mechanical properties of frozen soil, its bearing capacity, stability and deformation characteristics will change significantly with temperature changes, especially under the influence of seasonal thawing layer, which can easily cause a series of engineering problems. Therefore, special attention should be paid to protecting the thermal stability of frozen soil during the design and construction process to ensure the safety and long-term use of the road.
[0003] The current frozen soil subgrade is prone to instability of the foundation and damage to the road surface during use due to seasonal freezing and thawing cycles, which is inconvenient to use. CONTENT OF THE UTILITY MODEL
[0004] The present application provides a heat insulation protection structure for frozen soil subgrade to solve the problems in the background art.
[0005] The above technical purpose of the present application is achieved by the following technical scheme: A heat insulation protection structure for frozen soil subgrade, comprising a subgrade layer, the top end of the subgrade layer is provided with a heat insulation layer, the top of the heat insulation layer is provided with a road surface layer, the heat insulation layer comprises three layers of waterproof geotextile, the three layers of waterproof geotextile are provided with aerated concrete slabs between them, the waterproof geotextile and the aerated concrete slabs are coated with self-adhesive rubber asphalt, the road surface layer comprises a stone slab layer, the stone slab layer is arranged at the top end of the heat insulation layer.
[0006] By adopting the above scheme, the heat insulation layer is arranged to facilitate heat insulation of the subgrade layer, reducing instability of the foundation and damage to the road surface caused by seasonal freezing and thawing cycles. The waterproof geotextile is arranged to provide waterproof performance and prevent rainwater and heat from infiltrating. The aerated concrete slabs are arranged to improve the heat insulation performance and block the transfer of heat, preventing external heat from penetrating downward to the permafrost layer and affecting its stability. The self-adhesive rubber asphalt is arranged to tightly bond the waterproof geotextile and the aerated concrete slabs, and to enhance the waterproof, heat insulation, anti-peeling and anti-tearing performance of the waterproof geotextile. The stone slab layer is arranged to form natural ventilation channels in the gaps inside the stone slab layer, improving the heat dissipation and insulation performance, reducing the downward transfer of heat, and improving the stability of the permafrost layer.
[0007] Further, the subgrade layer comprises a surface soil layer, which is arranged at the bottom of the heat insulation layer.
[0008] By adopting the above scheme, the permafrost layer is protected by being covered by the topsoil layer.
[0009] Further, the bottom of the topsoil layer is provided with a permafrost layer, and a plurality of ventilation pipes are embedded in the permafrost layer.
[0010] By adopting the above scheme, the permafrost layer is cooled by the air flow caused by the natural pressure difference and temperature difference.
[0011] Further, the ventilation pipes are in a "U" shape structure, and the two ends of the ventilation pipes extend to the top end of the topsoil layer.
[0012] By adopting the above scheme, the two ends of the ventilation pipes are provided with air caps to promote air circulation by using the pressure difference, and the vertically upward extending parts at the two ends realize directional heat transfer, avoiding direct downward heat conduction to cause thawing of the permafrost.
[0013] Further, two heat pipes are arranged between the ventilation pipes, the heat pipes are arranged at the two ends of the ventilation pipes, and the bottom ends of the heat pipes extend into the permafrost layer.
[0014] By adopting the above scheme, the heat pipes extend to the bottom of the permafrost layer, so as to export the heat of the permafrost layer.
[0015] Further, the middle part of the heat pipe is provided with a heat insulation sleeve outside, and the heat insulation sleeve is arranged in the topsoil layer.
[0016] By adopting the above scheme, the heat exchange between the heat pipe and the topsoil layer is prevented by arranging the heat insulation sleeve, avoiding unnecessary heat absorption from the surrounding environment and affecting the heat conduction effect.
[0017] Further, the top end of the heat pipe is provided with a heat sink outside, and the heat sink is arranged at the top end of the topsoil layer.
[0018] By adopting the above scheme, the heat dissipation area is increased by arranging the heat sink, so as to improve the heat dissipation and cooling effect.
[0019] Further, the top of the stone layer is provided with a common concrete layer, and the top end of the common concrete layer is provided with a modified concrete layer.
[0020] By adopting the above scheme, the modified concrete layer made of modified asphalt concrete directly bears the vehicle load, provides friction to ensure driving safety, and resists external factors such as ultraviolet rays and water damage to improve service life, and the common concrete layer transmits and disperses the stress from the modified concrete layer, and also plays a certain waterproof role.
[0021] In summary, the present application has the following technical effects: By setting the heat preservation and insulation layer, the heat preservation and insulation of the roadbed layer is facilitated, the instability of the foundation and the damage of the road surface caused by seasonal freezing and thawing cycle are reduced, by setting the waterproof geotextile, the waterproof performance is provided, the infiltration of rainwater and heat is avoided, by setting the aerated concrete board, the heat preservation and insulation performance is improved, the transmission of heat is blocked, the external heat is prevented from penetrating to the permafrost layer to affect the stability, by setting the self-adhesive rubber asphalt, the waterproof geotextile and the aerated concrete board are tightly bonded, and the waterproof, heat insulation, anti-peeling and anti-tearing performance of the waterproof geotextile is enhanced, by setting the stone layer, the natural ventilation channel is formed in the gap of the stone layer, the heat dissipation and heat insulation performance is improved, the downward transmission of heat is reduced, which is beneficial to improve the stability of the permafrost layer; the present application, by setting the aerated concrete board, the heat preservation and insulation performance is improved, the transmission of heat is blocked, the external heat is prevented from penetrating to the permafrost layer to affect the stability, the stability of the permafrost layer is effectively improved, and has high practical value. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a three-dimensional structure schematic view of a frozen soil roadbed heat insulation protection structure of the present application; Figure 2 is a cross-sectional view of the heat preservation and insulation layer of the present application; Figure 3 is a three-dimensional structure schematic view of the roadbed layer of the present application; Figure 4 is a three-dimensional structure schematic view of the ventilation pipe of the present application; Figure 5 is a three-dimensional structure schematic view of the road surface layer of the present application.
[0023] In the figure, 1, roadbed layer; 11, permafrost layer; 12, topsoil layer; 13, heat pipe; 14, ventilation pipe; 2, heat preservation and insulation layer; 21, waterproof geotextile; 22, aerated concrete board; 3, road surface layer; 31, stone layer; 32, ordinary concrete layer; 33, modified concrete layer. DETAILED DESCRIPTION
[0024] The present application will be further described in detail below in combination with the drawings. EMBODIMENT
[0025] As shown in the accompanying Figure 1 to the accompanying Figure 5 : The utility model provides a frozen soil roadbed heat -proof protection structure, including roadbed layer 1, the top of roadbed layer 1 is equipped with heat -preserving layer 2, the setting of heat -preserving layer 2 is convenient for the heat preservation of roadbed layer 1, and the instability of ground and pavement damage caused by seasonal freeze -thaw cycle are reduced, and the top of heat -preserving layer 2 is equipped with pavement layer 3, heat -preserving layer 2 includes three waterproof geotextile 21, the setting of waterproof geotextile 21 is convenient for providing waterproof performance, avoids rainwater and heat infiltration, and the waterproof geotextile 21 between three waterproof geotextile 21 is equipped with aerated concrete slab 22, the setting of aerated concrete slab 22 is convenient for improving heat -preserving performance, and the transmission of heat is broken, avoids the external heat to infiltrate to permafrost 11 and influences stability, and the waterproof geotextile 21 and aerated concrete slab 22 are coated with self -adhesion rubber pitch between, the setting of self -adhesion rubber pitch is convenient for the close adhesion of waterproof geotextile 21 and aerated concrete slab 22, and can enhance waterproof geotextile 21's waterproof heat -insulating performance, anti -peeling performance and anti -tear performance, and pavement layer 3 includes stone layer 31, and stone layer 31 is set up at the top of heat -preserving layer 2, the setting of stone layer 31 is convenient for the gap in stone layer 31 to form natural ventilation channel, reaches the effect of improving heat -dissipating, heat -insulating performance, reduces the downward transmission of heat, and is favorable to improve permafrost 11 stability.
[0026] Wherein, the roadbed layer 1 includes topsoil layer 12, and the topsoil layer 12 is arranged at the bottom of the heat -preserving layer 2, and the setting of the topsoil layer 12 is convenient for covering the top of the permafrost 11 to provide protection for the permafrost 11.
[0027] Wherein, the bottom of the topsoil layer 12 is provided with the permafrost 11, and a plurality of ventilation pipes 14 are embedded in the permafrost 11, and the setting of the plurality of ventilation pipes 14 embedded in the permafrost 11 is convenient for cooling the permafrost 11 by using the air flow caused by the natural wind pressure difference and temperature difference.
[0028] Wherein, the ventilation pipe 14 is in the shape of "U", and the two ends of the ventilation pipe 14 extend to the top of the topsoil layer 12, and the two ends of the ventilation pipe 14 extend to the top of the topsoil layer 12, and the two ends of the ventilation pipe 14 are provided with a wind cap, and the air flow is promoted by using the wind pressure difference, and the two ends of the ventilation pipe 14 are vertically extended upwards, and the directional heat transfer is realized, and the direct downward conduction of heat is avoided to cause the thawing of frozen soil.
[0029] Wherein, two heat pipes 13 are arranged between the ventilation pipes 14, and the heat pipes 13 are arranged at the two ends of the ventilation pipes 14, and the bottom of the heat pipe 13 extends to the inside of the permafrost 11, and the bottom of the heat pipe 13 extends to the inside of the permafrost layer 11, and the heat pipe 13 is convenient for discharging the heat of the permafrost 11 outward.
[0030] The outer side of the middle part of the heat pipe 13 is sleeved with the heat insulation sleeve 15, which is arranged in the surface soil layer 12. The heat insulation sleeve 15 prevents heat exchange between the heat pipe 13 and the surface soil layer 12, avoids unnecessary heat absorption of the heat pipe 13 from the surrounding environment, and affects the heat conduction effect.
[0031] The outer side of the top end of the heat pipe 13 is provided with the heat dissipation fin 16, which is arranged at the top end of the surface soil layer 12. The heat dissipation fin 16 increases the heat dissipation area and improves the heat dissipation effect.
[0032] The top of the stone layer 31 is provided with the ordinary concrete layer 32, and the middle part of the top end of the ordinary concrete layer 32 is provided with the modified concrete layer 33. The modified concrete layer 33 made of modified asphalt concrete directly bears the vehicle load, provides friction to ensure driving safety, resists external factors such as ultraviolet rays and water damage, and prolongs the service life. The ordinary concrete layer 32 transmits and disperses the stress from the modified concrete layer 33, and also has a certain waterproof effect.
[0033] Specifically, by the setting of the surface soil layer 12, it is convenient to cover the top of the permafrost layer 11 and provide protection for the permafrost layer 11, by embedding several ventilation pipes 14 inside the permafrost layer 11, it is convenient to utilize the air flow caused by the natural wind pressure difference and temperature difference to cool the permafrost layer 11, by extending the ventilation pipe 14 to the top of the surface soil layer 12 at both ends, it is convenient to set the air cap at both ends of the ventilation pipe 14, utilize the wind pressure difference to promote air circulation, the part extending vertically upward at both ends realizes directional heat transfer, avoids direct downward heat conduction causing frozen soil melting, by extending the heat pipe 13 to the inside of the permafrost layer 11 at the bottom end, it is convenient for the heat pipe 13 to export the heat of the permafrost layer 11, by the setting of the heat insulation sleeve 15, it is convenient to prevent heat exchange between the heat pipe 13 and the surface soil layer 12, avoid unnecessary heat absorption from the surrounding environment affecting the heat conduction effect, by the setting of the cooling fin 16, it is convenient to improve the heat dissipation area, thereby improving the heat dissipation cooling effect, by the setting of the waterproof geotextile 21, it is convenient to provide waterproof performance, avoid rainwater and heat infiltration, by the setting of the aerated concrete slab 22, it is convenient to improve the thermal insulation performance, block the transmission of heat, avoid external heat from penetrating downward to the permafrost layer 11 affecting stability, by the setting of the self-adhesive rubber asphalt, it is convenient to tightly bond the waterproof geotextile 21 and the aerated concrete slab 22, and can enhance the waterproof, heat insulation, anti-peeling and anti-tearing performance of the waterproof geotextile 21, by the setting of the stone layer 31, it is convenient for the gap inside the stone layer 31 to form a natural ventilation channel, which improves the heat dissipation and heat insulation performance, reduces heat downward transmission, and is beneficial to improve the stability of the permafrost layer 11, by setting the modified concrete layer 33 in the middle of the top of the ordinary concrete layer 32, it is convenient for the modified concrete layer 33 made of 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, improve service life, the ordinary concrete layer 32 transmits and disperses the stress from the modified concrete layer 33, and also has a certain waterproof effect.
[0034] The specific embodiment is only an explanation of the application, which is not a limitation of the application, and those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the application, it is protected by the patent law.
Claims
1. A frozen soil embankment thermal insulation protection structure, characterized in that, The roadbed (1) includes a road base layer (1), a thermal insulation layer (2) is provided at the top of the road base layer (1), a road surface layer (3) is provided at the top of the thermal insulation layer (2), the thermal insulation layer (2) includes three layers of waterproof geotextile (21), an aerated concrete board (22) is provided between the three layers of waterproof geotextile (21), and self-adhesive rubber asphalt is coated between the waterproof geotextile (21) and the aerated concrete board (22), and the road surface layer (3) includes a rubble layer (31), the rubble layer (31) is provided at the top of the thermal insulation layer (2).
2. The frozen-so roadbed heat-insulation protection structure according to claim 1, characterized in that, The roadbed (1) includes a topsoil layer (12), which is located at the bottom of the thermal insulation layer (2).
3. The frost protected earth roadbed of claim 2, wherein, The bottom of the topsoil layer (12) is provided with a permafrost layer (11), and several ventilation pipes (14) are buried inside the permafrost layer (11).
4. The frost protected earth roadbed of claim 3, wherein, The ventilation pipe (14) has a "U" shaped structure, and both ends of the ventilation pipe (14) extend to the top of the topsoil layer (12).
5. The frost protected earth roadbed of claim 4, wherein, Two heat pipes (13) are provided between each ventilation pipe (14). The heat pipes (13) are located at both ends of the ventilation pipe (14), and the bottom end of the heat pipes (13) extends into the interior of the permafrost layer (11).
6. The frost protected earth roadbed of claim 5, wherein, The heat pipe (13) is fitted with an insulation sleeve (15) on the outer side of the middle part, and the insulation sleeve (15) is set inside the topsoil layer (12).
7. The frost protected earth roadbed of claim 6, wherein, The heat pipe (13) has a heat sink (16) on the outer side of its top end, and the heat sink (16) is located at the top of the topsoil layer (12).
8. The frost protected earth roadbed of claim 1, wherein, The top of the rubble layer (31) is provided with an ordinary concrete layer (32), and the middle of the top of the ordinary concrete layer (32) is provided with a modified concrete layer (33).