CN113373754A - Air isolation layer construction method, isolation overhead net and frozen soil roadbed construction method - Google Patents
Air isolation layer construction method, isolation overhead net and frozen soil roadbed construction method Download PDFInfo
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- CN113373754A CN113373754A CN202110743879.9A CN202110743879A CN113373754A CN 113373754 A CN113373754 A CN 113373754A CN 202110743879 A CN202110743879 A CN 202110743879A CN 113373754 A CN113373754 A CN 113373754A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention discloses an air isolation layer construction method, an isolation overhead net and a frozen soil roadbed construction method, belonging to the technical field of roadbed construction and comprising the following steps of S1, paving a sand gravel cushion layer; s2, paving an isolation overhead net on the sand-gravel cushion layer, forming a hollow layer which can isolate the downward heat transfer of the road surface of the upper highway and is communicated with the outside on the side of the negative slope and the side of the positive slope, and arranging a vent hole which is in convection with cold air of the negative slope at the position, close to the negative slope, of the bottom of the hollow layer; the air isolation layer can keep apart highway road surface and frozen earth's surface, through the isolated heat of upper portion highway road surface to the frozen earth's surface transmission of cavity, the cavity can be taken out the heat to the air current that can form to the hillside sunny slope to avoid the influence to the frozen earth's surface, the cold flow of downward convection current can be formed with the cold air of hillside to the ventilation hole simultaneously, thereby further adjust the initial condition of temperature assurance frozen earth's surface on frozen earth's surface.
Description
Technical Field
The invention relates to the technical field of roadbed construction, in particular to an air isolation layer construction method, an isolation overhead net and a frozen soil roadbed construction method.
Background
The permafrost in China is mainly distributed in high latitude areas in northeast and in high plateau areas in Qinghai-Tibet, and is divided into an upper layer and a lower layer, wherein the upper layer is an active layer which is melted in summer and frozen in winter, and the lower layer is a permafrost layer. The average temperature of the lower perennial frozen soil boundary in the northeast high-latitude region is-1 to 1 ℃, and the average temperature of the lower perennial frozen soil boundary in the Qinghai-Tibet plateau is about-3.5 to-2 ℃. The active layer of the permafrost is repeatedly frozen and thawed, so that the railway subgrade can be endangered, but for the highway, as a black asphalt pavement is arranged on the surface of the highway, the heat absorption capacity of the pavement layer on the upper part of the highway is large, the heat absorption of the pavement is larger than the heat dissipation due to the fact that the heat of the pavement is transmitted to destroy the hydrothermal balance state of the permafrost, so that the lower frozen soil layer is melted, the subgrade is thawed and sunk and deformed, the pavement is cracked, and the subgrade base is unevenly sunk or frost heaving and slurry turning are caused due to the fact that water is gathered to the upper part of the subgrade. The current treatment technology for frozen soil roadbed comprises the following steps: the flaky stone roadbed is characterized in that large flaky stones are paved on the lower portion of the existing roadbed, and gaps among the flaky stones are utilized to adjust the internal and external temperatures, so that the influence on frozen soil is reduced. The heat rod is used for treating the roadbed, the sunshade side slope is used for treating the roadbed, heat insulation measures are taken, the roadbed is treated by changing and filling the basement, and more than 10 kinds of roadbed, such as a bridge is used for replacing a road, and the like.
However, the above treatment method has the disadvantages that the frozen soil section is short of stones, the stone transport distance is far, the cost is high, and the heat insulation and dissipation effects are limited and have large limitations. In order to provide a ventilating pipe subgrade treatment method, for example, the treatment method in the utility model with the patent number of 201620205095.5 and the name of 'a ventilating pipe block stone interlayer clamping type automatic control ventilating pipe subgrade structure': set up along perpendicular road bed trend in embankment banket with the communicating horizontal ventilation pipe in the external world, lay the lump stone layer between the adjacent horizontal ventilation pipe and fix the ventilation pipe, the horizontal ventilation pipe both ends can form convection current wind, then can take away the heat in the embankment banket, effectively reduce the decurrent transmission of heat, but above-mentioned horizontal ventilation pipe interval is great, therefore partial heat has only been taken away to horizontal ventilation pipe, and the lump stone layer between the horizontal ventilation pipe is heat transfer's high-efficient medium, therefore the heat can avoid the ventilation pipe to transmit to the frozen soil layer from the lump stone layer. Therefore, in order to solve the above problems, a new ventilation pipe is proposed in the utility model entitled "a permeable wall ventilation pipe and crushed stone composite roadbed" with patent number "201120560271.4: set up the trompil on the pipe wall of ventilation pipe, the trompil allows the heat conduction of the lump stone layer between the ventilation pipe to get into in the ventilation pipe, then carries out the heat in the lump stone layer out of the road bed in the convection current wind of ventilation pipe. However, although the ventilation pipe with the open holes can take out heat in the rock layer to achieve the effect of accelerating air flow and adjusting temperature, the heat on the surface of the upper highway is still continuously transferred downwards, so that the heat is exchanged only through the air, and the phenomenon that the soil layer containing ice or the soil layer rich in ice at the lower part is not melted cannot be ensured.
Disclosure of Invention
The invention aims to solve the technical problems and provides an air isolation layer construction method, an isolation overhead net and a frozen soil roadbed construction method, wherein the air isolation layer can isolate a highway pavement from the frozen soil earth surface up and down, a hollow layer in the air isolation layer can isolate heat transferred downwards from the upper highway pavement so as to prevent the heat from being transferred to the frozen soil layer, meanwhile, the heat in the hollow layer is timely brought out under the action of convection wind formed by a negative slope side and a positive slope side, the heat is completely eliminated, a ventilation hole in the hollow layer can form downward convection cold flow with the cold air in the negative slope, and the temperature of the frozen soil earth surface is further adjusted so as to ensure the original state of the frozen soil earth surface.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an air isolation layer construction method, which comprises the following steps:
s1, paving a sand gravel cushion;
s2 the isolation overhead net is laid on the sand cobble bed course to form and can completely cut off upper portion highway road surface and transfer heat downwards, and the cloudy slope side and sunny slope side all with external communicating hollow layer, hollow layer' S bottom is close to be equipped with on the position of cloudy slope with the ventilation hole of cloudy slope air conditioning convection current.
Preferably, the thickness of the sand and gravel cushion layer is at least 0.1 m.
Preferably, the hollow thickness of the hollow layer is 0.1-0.5 m.
Still provide an isolation overhead net, including laying bottom backing plate on the sand cobble bed course, be equipped with the top layer extension board through connecting the stand frame on the bottom backing plate, bottom backing plate is close to negative slope one side is equipped with the ventilation hole.
Preferably, the bottom base plate, the top support plate and the connecting upright posts are of a reinforced concrete structure.
The isolated overhead net comprises a plurality of groups of prefabricated plates which are laid on the gravel cushion layer and are mutually spliced up and down, each prefabricated plate is provided with a connecting upright post and a splicing hole for splicing the connecting upright post, and the prefabricated plate is provided with a ventilation hole close to the lower part of one side of the negative slope.
Preferably, the connecting upright post is a hollow conical upright post, and the end of the conical upright post is a circular boss for being inserted into the insertion hole.
The construction method of the frozen soil roadbed comprises the following steps:
s1, paving the air isolation layer on the surface of the frozen soil;
s2, paving a sand gravel cushion layer on the air isolation layer, and paving a soil filling layer on the sand gravel cushion layer;
s3, paving a road base layer on the filling layer, and then paving a road surface layer on the road base layer;
and S4, filling a road shoulder on the filling layer.
Preferably, before the road base layer is laid, another air isolation layer is laid on the filling layer laid in step S2, and a sand gravel cushion layer is laid on the air isolation layer.
Preferably, before the step of laying the soil filling layer, a layer of the air isolation layer is added on the air isolation layer laid in the step S1.
Compared with the prior art, the invention has the following technical effects:
1. the thermal conductivity of soil is mainly determined by the thermal conductivity of each constituent substance in soil, because the thermal conductivity of each substance component of soil is very different and the contents are different. The thermal conductivity of quartz is nearly 350 times that of air, that of ice is about 4 times that of water, and that of water is 20 times that of air, and even the organic matter with the smallest thermal conductivity in soil has a thermal conductivity 10 times that of air. Therefore, the air is a natural air isolation layer, the air isolation layer is just based on the low heat conductivity coefficient of the air, the air isolation layer is arranged in the highway subgrade to separate the highway pavement which is easy to absorb heat from the frozen earth surface, the hollow layer in the air isolation layer can isolate the heat of the upper pavement, meanwhile, the air layer in the hollow layer forms a natural heat insulation layer to isolate the heat from the outside, the heat is isolated from the downward transmission, the negative slope side and the positive slope side of the hollow layer are the same as the outside, convection wind can be formed, the heat of the hollow layer is timely taken out of the hollow layer, and then the heat is completely eliminated; meanwhile, the bottom of the hollow layer close to the side of the negative slope is also provided with a vent hole, and the vent hole can form downward flowing convection with cold air of the negative slope, so that the temperature of the frozen soil layer is adjusted to ensure that the frozen soil layer keeps the original state; in addition, the air isolation layer can also obstruct cold quantity in the frozen soil layer from uploading, and the cold quantity is intersected with the heat quantity to influence the heat quantity unbalance of the roadbed.
2. Usually the ponding of frozen soil earth's surface is highest about 0.1 ~ 0.5m, consequently sets up the sand gravel bed course at least more than 0.1m, can avoid frozen soil earth's surface ponding infiltration sand gravel bed course to get into in the cavity layer, and the sand gravel bed course also conveniently makes level simultaneously, lays the isolation overhead net.
3. Keep apart built on stilts net has adopted the bottom backing plate that has the connection stand, top layer extension board structure, the bottom backing plate, the top layer extension board is all gapped, then can form the air bed after laying, the top layer extension board is the pore-free board, the heat that can the transmission of separation upper portion comes, connect the stand simultaneously and can give the fine support of top layer extension board, to bearing laying of upper portion highway, be close to the negative slope side on the bottom backing plate and be equipped with the ventilation hole, become the ventilation hole on cavity layer after laying, form the cold flow with the negative slope.
4. The isolation overhead net is assembled by the prefabricated plates, the connection upright posts and the insertion holes are mutually inserted up and down to lay a group of prefabricated plates, laying efficiency of the isolation overhead net is greatly improved, laying difficulty is reduced, a large number of field construction steps are omitted, construction efficiency is improved, laying efficiency is greatly improved, and construction efficiency is improved.
5. The air isolation layer is additionally arranged on the filling layer in the frozen soil roadbed, the air isolation layer above the filling layer can block heat of the upper highway pavement from being transmitted downwards, and the air isolation layer below the filling layer can block cold energy transmitted upwards by the frozen soil layer below the filling layer while blocking the heat above, so that heat and cold energy are prevented from intersecting to cause cold and heat imbalance in the frozen soil roadbed.
6. Between the fill soil layer in the frozen soil road bed and the air isolation layer, establish one air isolation layer again, improve thermal-insulated effect by a wide margin, thoroughly isolated upper portion highway road surface's heat passes down, goes up the main isolated upper portion heat of one air isolation layer simultaneously, and the air isolation layer of below is main isolated the cold volume on frozen soil earth's surface to avoid heat and cold volume to meet in same cavity in situ, disturb the intraformational temperature of cavity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a cross-sectional view of an embodiment of a frozen earth subgrade;
FIG. 2 is a schematic side view of a frozen soil roadbed;
FIG. 3 is a cross-sectional view of another embodiment of a frozen earth subgrade;
FIG. 4 is a schematic side view of a frozen soil roadbed;
FIG. 5 is a schematic structural diagram of an embodiment of an isolated overhead network;
FIG. 6 is a schematic structural view of a prefabricated panel without holes in another embodiment of the insulated overhead screen;
FIG. 7 is a schematic structural diagram of the perforated precast slabs in the isolated overhead net:
fig. 8 is a front view of an isolated overhead net.
Description of reference numerals: 1. frozen earth surface; 2. a sand-gravel cushion layer; 3. a hollow layer; 4. isolating the overhead network; 5. filling a soil layer; 6. a convection port; 7. a highway base course; 8. a pavement layer; 9. a bottom liner plate; 10. a top layer support plate; 11. connecting the upright posts; 12. a vent hole; 13. prefabricating a slab; 14. a circular boss; 15. inserting holes; 16. a road shoulder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a construction method of an air isolation layer, as shown in fig. 1 to 8, comprising the following steps:
s1, laying a sand-gravel cushion layer 2 for heightening and leveling to avoid the immersion and invasion of partial accumulated water on the surface 1 of the frozen soil;
s2, paving an isolation overhead net 4 on the sand-gravel cushion layer 2, forming a hollow layer 3 capable of isolating the downward heat transfer of the road surface of the upper highway through the isolation overhead net 4, communicating the negative slope side and the positive slope side of the hollow layer 3 with the outside to form convection air, adjusting the air temperature in the hollow layer 3, arranging a vent hole 12 on the bottom of the hollow layer 3 close to the negative slope, allowing the cold air in the negative slope to flow downwards through the vent hole 12, adjusting the temperature of the frozen soil active layer to keep the original state of the frozen soil, and ensuring the stability of the frozen soil. Meanwhile, because the heat conductivity coefficient of the air is very small, the air in the hollow layer 3 plays a role in heat insulation, and can timely bring out the heat in the hollow layer 3 under the action of convection wind, and meanwhile, the air can also prevent the cold energy of the frozen soil layer from being transferred to the road surface, so that the cold energy of the heat meets the cold energy to cause the cold and heat imbalance in the road bed. The position of the vent hole 12 is set according to the actual engineering requirement, and naturally, in order to improve the convection effect of the cool air of the negative slope and the vent hole 12, the vent hole 12 may be set from the middle of the hollow layer 3 to the negative slope side.
Because the accumulated water on the surface of the frozen earth 1 is generally 0.1-0.5 m at most, in order to prevent the accumulated water on the surface of the frozen earth 1 from entering the hollow layer 3 through the vent holes 12, in the embodiment, the thickness of the sand-gravel cushion layer 2 is at least 0.1m, so that the accumulated water is prevented from completely immersing the sand-gravel cushion layer 2 and entering the hollow layer 3.
In order to make the hollow layer 3 have enough air to insulate heat, in the embodiment, the hollow thickness of the hollow layer 3 is 0.1-0.5 m, so that the air in the hollow layer 3 can insulate heat.
The embodiment provides an isolation overhead net, as shown in fig. 1 to 5, which mainly comprises a bottom cushion plate 9, a top layer support plate 10 and connecting columns 11, wherein the connecting columns 11 are arranged in a matrix. The top layer support plate 10 in the isolation overhead net 4 needs to be laid on the sand-gravel cushion layer 2, and after the laying is finished, due to the existence of the connecting upright post 11, a hollow interlayer is formed between the bottom layer cushion plate 9 and the top layer support plate 10, and then the hollow layer 3 is formed. Top layer extension board 10 is the solid board of sclausura, the heat that comes down can the separation top transmission of solid board, the air heat conductivity coefficient in the cavity layer 3 is less simultaneously, can form the air heat insulation layer, isolated heat, avoid the downward transmission of upper portion highway road surface absorptive heat, and bottom backing plate 9, all around of the structure that top layer extension board 10 formed do not seal, because after laying on the gravel and sand bed course 2, bottom backing plate 9, the negative slope side and the positive slope side of top layer extension board 10 are all unsealed, cavity layer 3 unsealed negative slope side and positive slope side all form convection current mouth 6, can make bottom backing plate 9, the air between the top layer extension board 10 forms convection wind through convection current mouth 6, then take away the heat in the air, further adjust the temperature in the cavity layer 3. The bottom backing plate 9 is also a solid plate without holes on one side close to the sunny slope, a ventilation hole 12 is arranged on one side close to the cloudy slope, and the existence of the ventilation hole 12 and the convection port 6 of the cloudy slope can form downward convection air, so that the cold air on the cloudy slope is brought into the ventilation hole 12 and then is downwards transmitted to the frozen soil layer to protect the frozen soil.
Further, in this embodiment, the bottom mat 9, the top layer support plate 10 and the connecting columns 11 are made of reinforced concrete, and a grid structure with a columnar array is directly woven by using reinforcing steel bars, and then concrete is poured.
The present embodiment also provides an isolated overhead net, as shown in fig. 1 to 4 and fig. 6 to 8, which is composed of a plurality of groups of prefabricated panels 13 inserted into each other, wherein the prefabricated panels 13 include two types of prefabricated panels 13, one type of prefabricated panel 13 having no holes and being a solid panel, and the other type of prefabricated panel 13 having ventilation holes 12, and the two types of prefabricated panels 13 are provided with connecting posts 11 arranged in a matrix and insertion holes 15 arranged in a matrix. As shown in fig. 8, the prefabricated panels 13 are inserted into each other through the insertion holes 15 of the prefabricated panels 13, and the connection columns 11 of the prefabricated panels 13 are inserted into the insertion holes 15 of the other prefabricated panels 13, so that the upper prefabricated panel 13 and the lower prefabricated panel 13 are spaced apart from each other, and after a plurality of groups of prefabricated panels 13 inserted into each other are stacked together, the separation overhead net 4 for laying the hollow layer 3 is formed. When in laying, the prefabricated plates 13 inserted up and down at the position of the sand-gravel cushion layer 2 close to the position of the negative slope are adopted as the prefabricated plates 13 at the bottom, and the prefabricated plates 13 with the vent holes 12 are adopted. The isolated overhead net 4 adopts a prefabricated plate 13 splicing mode, so that the construction efficiency can be greatly improved, and effective construction is guaranteed.
In this embodiment, the connecting upright post 11 is a hollow conical upright post, and the end of the conical upright post is a circular boss 14 for inserting into the insertion hole 15. After the circular boss 14 is inserted into the insertion hole 15, the conical wall of the conical upright post abuts against the outer side of the insertion hole 15, so that a limiting effect can be achieved, the distance between the two prefabricated plates 13 is unchanged after the two prefabricated plates 13 are subjected to weight, and meanwhile, the connecting upright post 11 is hollow, and the weight of the prefabricated plates 13 can be reduced.
In this embodiment, the preformed sheet 13 is made of high molecular polymer by blow molding, such as low temperature resistant materials like high density polyethylene and polyvinyl chloride, or low temperature resistant materials by adding additives, and is formed by injection molding or compression molding. The thickness of the precast slab 13 is generally between 10 and 30mm, and the total height of the precast slab 13 and the connecting upright post 11 is generally between 100 and 500 mm; the distance between the connecting upright columns 11 is generally 2-6 times of the diameter of the bottom ends of the connecting upright columns 11. The prefabricated slab 13 may be integrally prefabricated from reinforced concrete.
The implementation also provides a construction method of the frozen soil roadbed, which comprises the following steps as shown in figures 1 to 8:
s1, paving an air isolation layer on the frozen soil ground surface 1;
s2, paving a sand-gravel cushion layer 2 on the air isolation layer for leveling and protecting the top of the air isolation layer, and paving a filling layer 5 on the sand-gravel cushion layer 2, wherein the filling layer 5 adopts a filler meeting the requirements of a common roadbed;
s3, paving a road base layer 7 on the filling layer 5, and then paving a road surface layer 8 on the road base layer 7;
and S4, filling the road shoulder 16 on the filling layer 5.
In the embodiment, the thicknesses of the sand and gravel cushion layers 2 are at least 0.1m, the thickness of the filling layer 5 is adjusted according to the requirement of the roadbed, and the filling layer 5 plays roles in heightening, leveling and buffering, so that the protection of the air isolation layer is improved.
In this embodiment, before the road base 7 is laid, an air separation layer is further laid on the soil fill 5 laid in step S2, and the sand gravel cushion 2 is laid on the air separation layer. In the implementation, the heat of the upper pavement is considered, and the heat is blocked by the air isolation layer on the upper part of the filling layer 5, so that the heat is isolated, and the heat brought by the pavement is digested. The air isolation layer below the fill layer 5 blocks the upward transmission of the cold energy of the frozen soil layer, and avoids the cold and hot unbalance of the roadbed caused by the meeting of the heat and the cold, thereby achieving the stability of the roadbed.
In this embodiment, before the filling 5 is laid, an air isolation layer is added on the air isolation layer laid in step S1 to improve the heat insulation effect, so that the heat of the road surface is completely eliminated at the air isolation layer.
| Name (R) | Quartz | Mineral substance | Soil organic matter | Water (W) | Ice | Air (a) |
| Thermal conductivity w/(m.k) | 8.4 | 2.9 | 0.25 | 0.6 | 2.37 | 0.026 |
| Density kg/m3 | 2650 | 2650 | 1300 | 1000 | 900 | 1.2 |
As can be seen from the above table, the thermal conductivity of air is minimal, and therefore, a method of isolation using air is possible. The heat conductivity coefficient of air is 0.0267W/(m2.0C) at normal temperature (20 deg.C), and 0.0251W/(m) at 0 deg.C2DEG C), 0.0321W/(m) at 100 DEG C2Deg.c). Therefore, the air can block the downward transmission of the upper heat energy and can also prevent the upward transmission of the lower cold energy.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. The construction method of the air isolation layer is characterized by comprising the following steps of:
s1, paving a sand gravel cushion;
s2 the isolation overhead net is laid on the sand cobble bed course to form and can completely cut off upper portion highway road surface and transfer heat downwards, and the cloudy slope side and sunny slope side all with external communicating hollow layer, hollow layer' S bottom is close to be equipped with on the position of cloudy slope with the ventilation hole of cloudy slope air conditioning convection current.
2. The air insulation blanket construction method of claim 1 wherein said sand gravel blanket is at least 0.1m thick.
3. The air insulation layer construction method as claimed in claim 2, wherein the hollow thickness of the hollow layer is 0.1 to 0.5 m.
4. An isolated overhead net applied to the construction method of the air isolation layer in claim 1, which comprises a bottom base plate paved on the sand-gravel cushion layer, wherein a top layer support plate is erected on the bottom base plate through a connecting upright post, and a vent hole is formed in one side, close to the negative slope, of the bottom base plate.
5. The isolating overhead net of claim 4, wherein the bottom liner plate, the top layer plate and the connecting columns are of a reinforced concrete structure.
6. An isolated overhead net applied to the construction method of the air isolation layer in claim 1, which comprises a plurality of groups of prefabricated plates which are laid on the sand-gravel cushion layer and are mutually inserted up and down, wherein each prefabricated plate is provided with a connecting upright post and an inserting hole for inserting the connecting upright post, and the prefabricated plate below one side close to the negative slope is provided with a vent hole.
7. The isolated overhead net of claim 5, wherein the connecting upright is a hollow conical upright, and the end of the conical upright is a circular boss for inserting into the insertion hole.
8. A frozen soil roadbed construction method, which adopts the air isolation layer construction method of any one of claims 1 to 3, and is characterized by comprising the following steps:
s1, paving the air isolation layer on the surface of the frozen soil;
s2, paving a sand gravel cushion layer on the air isolation layer, and paving a soil filling layer on the sand gravel cushion layer;
s3, paving a road base layer on the filling layer, and then paving a road surface layer on the road base layer;
and S4, filling a road shoulder on the filling layer.
9. The method of claim 8, wherein before the road base layer is constructed, the air separation layer is further constructed on the soil pack constructed in the step S2, and a sand gravel cushion is constructed on the air separation layer.
10. The method of claim 8, wherein a layer of the air separation layer is added to the air separation layer laid in step S1 before the earth fill is laid.
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