CN116590983A - Built-in snow melting heat insulation system for frozen soil foundation pavement and construction method thereof - Google Patents
Built-in snow melting heat insulation system for frozen soil foundation pavement and construction method thereof Download PDFInfo
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- CN116590983A CN116590983A CN202310432960.4A CN202310432960A CN116590983A CN 116590983 A CN116590983 A CN 116590983A CN 202310432960 A CN202310432960 A CN 202310432960A CN 116590983 A CN116590983 A CN 116590983A
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- 238000009413 insulation Methods 0.000 title claims abstract description 71
- 238000002844 melting Methods 0.000 title claims abstract description 43
- 230000008018 melting Effects 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 239000004575 stone Substances 0.000 claims abstract description 72
- 239000010426 asphalt Substances 0.000 claims abstract description 51
- 239000004033 plastic Substances 0.000 claims abstract description 51
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 37
- 239000004917 carbon fiber Substances 0.000 claims abstract description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 239000004576 sand Substances 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 13
- 239000011707 mineral Substances 0.000 claims description 13
- 239000013521 mastic Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 8
- 230000001502 supplementing effect Effects 0.000 claims description 8
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
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- -1 coarse Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
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- 239000005413 snowmelt Substances 0.000 claims 1
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Classifications
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
-
- 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
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
-
- 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
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
- E01C11/265—Embedded electrical heating elements ; Mounting thereof
-
- 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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a snow melting heat insulation system and a construction method thereof for a frozen soil foundation pavement, wherein the system sequentially comprises a multi-broken stone asphalt mixture layer, a concrete layer, a graded broken stone layer, a snow melting heat insulation device, an anti-freezing and expanding soil layer, a frost-expanding sensitive soil layer and a plain soil ramming layer from top to bottom, the snow melting heat insulation device is formed by wrapping an EPS heat insulation plate and a carbon fiber heating wire by a double-layer bidirectional steel-plastic grid, and the carbon fiber heating wire is fixed above the EPS heat insulation plate. According to the invention, the EPS heat insulation board and the carbon fiber heating wire are wrapped by adopting the double-layer steel-plastic composite grating, the interlocking and biting actions of the reinforced bearing surface can be effectively improved, the bearing capacity of the foundation can be greatly enhanced, the lateral displacement can be effectively restrained, the stability of the foundation can be enhanced, the upper limit of permafrost can be reduced to move downwards by internally arranging the EPS heat insulation board, the permafrost ablation process can be effectively relieved, the temperature of a frozen road surface can be kept, the deformation degree can be reduced, and the carbon fiber heating wire can effectively solve the practical problems of snowfall and the like of the frozen road surface.
Description
Technical Field
The invention relates to the technical field of concrete roads, in particular to a built-in snow melting heat insulation system for a frozen soil foundation pavement and a construction method thereof.
Background
Due to the related factors such as severe natural environment conditions in the frozen soil area, the elevation is high, the average air temperature for many years is below 0 ℃, so that road surface diseases frequently occur on road surfaces, meanwhile, due to poor stability of frozen soil, the road surfaces in the frozen soil area are mainly asphalt surfaces, the frozen soil foundation is thawed and sunk for many years, so that the roadbed is unevenly settled, and then the asphalt surfaces are extremely easy to generate diseases such as cracks, deformation, oil-flooding diseases, looseness and the like, wherein the phenomenon of the road surface cracks accounts for 50% of the main diseases, and the road surface crack is also one of the main forms of the road surface diseases. In addition, the high thermal conductivity of the asphalt pavement as a black pavement can greatly increase the heat entering of a frozen soil layer for many years, and the higher heat absorption rate easily causes higher heat absorption efficiency when the surface temperature of the asphalt pavement is compared with that of a surrounding non-asphalt base layer. Meanwhile, most of the areas at high altitude are snowy days every winter, snow roads with frozen lines of sight can be influenced after snowfall, the friction coefficient between tires and the roads is extremely small, the braking distance is increased, and traffic accidents are easily caused.
Because of the influence of various factors (water, temperature and freeze thawing) in low-temperature environment, the influence of continuous influence of the running vehicle load is added, the strength and rigidity of the roadbed are attenuated, the bearing capacity of the roadbed is influenced, the roadbed is deformed and the strength is changed, the strength and the deformation of the roadbed are seriously influenced due to repeated freeze thawing in high-altitude seasonal frozen soil areas, the influence of environmental factors and vehicle load on the long-term performance of the roadbed is required to be comprehensively considered during actual pavement construction, the freezing stability of the road in the frozen soil areas is extremely important, and the frozen soil foundation must have enough strength and stability to ensure the normal running of the road.
According to the characteristics of the frozen soil foundation, in order to avoid the deep damage of the frozen soil and protect the road subgrade from being influenced, the heat preservation is arranged, the embedded snow melting device is a key measure for protecting the frozen soil from being stable, the embedded snow melting device is a key measure for solving the problem that snow is accumulated on the road surface due to snowfall, the heat preservation is arranged in the subgrade, the embedded snow melting device can effectively prevent upper heat from being transmitted to the deep of the frozen soil foundation and can effectively melt snow, meanwhile, the broken stone slope protection subgrade can effectively reduce the temperature of the subgrade and the substrate for many years, air in the broken stone layer plays a heat insulation role in summer, cold and hot dry air convection is generated in the broken stone layer in winter, and the thermal stability of the frozen soil subgrade for many years is protected.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a built-in snow-melting heat insulation system for a frozen ground pavement and a construction method thereof, which can effectively ensure that the road area snow is rapidly cleared under the condition of stabilizing a frozen ground structural layer, prevent the heat on the surface of a roadbed from being transferred to the deep part of the frozen ground to ensure the purpose of protecting deep frozen soil, and effectively protect the dynamic stability of the frozen soil for many years.
In order to solve the technical problems, the invention adopts the following technical scheme:
the snow melting heat insulation system is arranged in a frozen soil foundation pavement, a multi-broken stone asphalt mixture layer, a concrete layer, a graded broken stone layer, a snow melting heat insulation device, an anti-freezing expansion soil layer, a frost-expansion sensitive soil layer and an plain soil ramming layer are sequentially arranged from top to bottom, the snow melting heat insulation device is formed by wrapping an EPS heat insulation plate and a carbon fiber heating wire by a double-layer bidirectional steel plastic grid, the carbon fiber heating wire is fixed above the EPS heat insulation plate, the double-layer bidirectional steel plastic grid comprises a double-layer bidirectional steel plastic grid upper layer and a double-layer bidirectional steel plastic grid lower layer, a thick fine-grained soil protection layer is filled in a gap of the double-layer bidirectional steel plastic grid upper layer, and a middle coarse sand protection layer is filled in a gap of the double-layer bidirectional steel plastic grid lower layer.
Furthermore, the snow melting heat insulation device is set to be 3.5mX0.125mX3.5 m according to the actual road conditions in the frozen soil area.
Furthermore, the carbon fiber heating wire of the carbon fiber heating wire arranged in the snow melting heat insulation device is laid below a frozen soil pavement track belt, and the track belt position is a heating road section.
Further, the carbon fiber heating wires arranged in the snow melting heat insulation device are distributed in the road wheel track belts in a U shape, 4U-shaped carbon fiber heating wires are arranged, each 4U-shaped carbon fiber heating wire consists of carbon fiber heating wires, the size of each wheel track belt is 3.5 multiplied by 0.8m, and the arrangement interval of the carbon fiber heating wires is 100mm.
Further, the multi-broken stone asphalt mixture layer is 1-3cm thick, is prepared by mixing an SMA asphalt mastic asphalt mixture, a 1SAC multi-broken stone asphalt mixture layer and an OGFC open graded asphalt wearing layer, and is prepared by filling and wrapping asphalt mastic cement binder consisting of asphalt, mineral powder and a fiber stabilizer in the pore volume of a mineral aggregate framework and the surface of the mineral aggregate to form the multi-broken stone asphalt mixture layer with the porosity of 2-4%.
Further, the graded broken stone layer is prepared by mixing broken stone and stone scraps, and the four materials are respectively: 20-30mm broken stone, 10-20mm broken stone, 5-10 mm broken stone and 1-5mm stone chips are paved according to construction requirements.
Further, the frost heaving prevention soil layer is formed by backfilling non-frost heaving middle sand and coarse sand
The construction method for the frozen soil foundation pavement built-in snow melting heat insulation system comprises the following steps:
firstly, cleaning a frozen soil roadbed, carrying out drainage treatment on the earth surface, secondly, treating a soft foundation, and carrying out basic layer tamping on a certain section of roadbed with poor soil conditions by using plain soil to form a plain soil tamping layer;
step (2), supplementing water by utilizing the ambient temperature and the supplementing soil body, and paving a frost heaving sensitive soil layer;
step (3), backfilling pile foundations on the road subgrade in the frozen soil area by utilizing non-frost-swelling medium sand and coarse sand to form an anti-frost-swelling soil layer;
cleaning the surface of the frost heaving prevention soil layer, paving double-layer bidirectional steel-plastic grids, overlapping adjacent two grids at the juncture of the two grids, filling a middle coarse sand layer and thick fine soil at the gaps of the upper and lower steel-plastic grids, splicing an EPS heat insulation plate according to the actual size of the steel-plastic grids after paving, bonding the spliced part by adopting an adhesive, paving a carbon fiber heating wire after bonding, covering the upper-layer bidirectional steel-plastic grid above the carbon fiber heating wire after mounting, and occluding and fixing the upper-layer bidirectional steel-plastic grid and the lower-layer bidirectional steel-plastic grid;
step (5), after the double-layer bidirectional steel-plastic grid is paved, mixing and stirring crushed stones with different particle sizes and stone chips, wherein the crushing value of coarse aggregates is not more than 30%, the content of needle-shaped particles is not more than 20%, and the materials such as coarse, medium and small crushed stone aggregates, stone chips and the like are required to meet the specified grading requirements, and the preparation steps according to 4 grades are as follows: paving 20-30mm broken stone, 10-20mm broken stone, 5-10 mm broken stone and 1-5mm broken stone according to the actual working condition requirements on site to form a graded broken stone layer;
step (6), casting concrete on site on the graded broken stone layer to form a concrete layer;
step (7), mixing an SMA asphalt mastic gravel mixture, a 1SAC multi-gravel asphalt mixture layer and an OGFC open graded asphalt wearing layer, and filling and wrapping an asphalt mastic cement binder consisting of asphalt, mineral powder and a fiber stabilizer into the surface of the mineral aggregate and the pore volume of a coarse aggregate framework to form the multi-gravel asphalt mixture layer with the porosity of 2-4%.
Further, the double-layer bidirectional steel-plastic composite grid is paved between the graded gravel layer and the frost-proof swelling soil layer, the actual-size pavement is paved according to a pavement construction traffic lane by 3.75mX3.75m/block, and the embedded position of the device is 240mm away from the pavement.
Further, the method further comprises the following steps:
and (8) paving particle size gravel layers on two sides of the snow melting heat insulation system after construction.
The invention has the beneficial effects that:
(1) The EPS board has good protection performance against frozen ground road surfaces, the heat transfer can be effectively reduced by arranging the heat insulation layer inside, and the EPS board has excellent corrosion resistance, aging resistance and heat insulation performance, can keep the strength unchanged even if paved in the frozen ground road surfaces, and has good heat insulation performance, and can reduce or eliminate the frozen expansion of the foundation soil due to the good waterproof seepage insulation performance;
(2) The EPS heat insulation board and the broken stone slope protection are used for carrying out composite heat insulation measures, so that the temperature influence of a permafrost region can be effectively solved, the thermal boundary condition of a roadbed slope surface is greatly changed, and the annual average temperature of the slope surface and the annual worse slope surface temperature are reduced;
(3) The double-layer bidirectional steel-plastic grid pavement completely meets the special soil environment of a permafrost region, has high tensile and compressive strength and small creep deformation, can greatly strengthen the bearing capacity of a foundation, effectively restrict the lateral displacement of a soil body, can better fix the EPS heat insulation board without being damaged by external load force, has strong bearing capacity, corrosion resistance, aging resistance, large friction coefficient and long service life compared with the traditional grid pavement, and is more suitable for the road surface of the permafrost region;
(4) The invention has the advantages of quick and simple construction, more stable overall structure, stable structural layers, strong bearing capacity and enhanced foundation stability, and is suitable for areas with severe working condition environments such as high-altitude frozen soil areas.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of the present invention directed to a frozen ground foundation pavement embedded snow melting insulation system;
FIG. 2 is a plan layout view of a two-layer bi-directional steel-plastic grid in accordance with an embodiment of the present invention;
fig. 3 is a layout diagram of a carbon fiber heating wire in an embodiment of the present invention.
Reference numerals in the drawings are described as follows: the multi-broken stone asphalt mixture layer, a 2-concrete layer, a 3-graded broken stone layer, a 4-snow melting heat insulation device, a 5-frost heaving prevention soil layer, a 6-frost heaving sensitivity soil layer, a 7-plain soil ramming layer, an 8-carbon fiber heating wire, a 9-fine soil protection layer, a 10-double-layer bidirectional steel-plastic grid upper layer, an 11-EPS heat insulation plate, a 12-double-layer bidirectional steel-plastic grid lower layer, a 13-medium coarse sand protection layer and a 14-double-layer bidirectional steel-plastic grid.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of one embodiment of a snow melting and heat insulating system built-in a frozen ground road surface, which comprises a multi-broken stone asphalt mixture layer 1, a concrete layer 2, a graded broken stone layer 3, a snow melting and heat insulating device 4, an anti-freezing expansion soil layer 5, a frost-expansion sensitive soil layer 6 and a plain soil ramming layer 7 from top to bottom.
The multi-broken stone asphalt mixture layer 1 is 1-3cm thick, and can be prepared by mixing an SMA asphalt mastic asphalt mixture, a 1SAC multi-broken stone asphalt mixture layer and an OGFC open graded asphalt wearing layer, and filling and wrapping the asphalt mastic adhesive binder composed of a fiber stabilizer into the surface of the mineral aggregate and the pore volume of a coarse aggregate framework to form the multi-broken stone asphalt mixture layer 1 with the porosity of 2-4%.
The concrete layer 2 adopts cast-in-place concrete, and the grade is C30.
The graded broken stone layer 3 is prepared by mixing broken stone and stone scraps, and the four materials are respectively: paving 20-30mm broken stone, 10-20mm broken stone, 5-10 mm broken stone and 1-5mm broken stone according to construction requirements.
The snow melting heat insulation device 4 is formed by wrapping an EPS heat insulation board 11 and a carbon fiber heating wire 8 by a double-layer bidirectional steel-plastic grid 13, the thickness of the EPS plate is 10cm,
the carbon fiber heating wire 8 is fixed above the EPS insulation board 11. As shown in fig. 2, the double layer bidirectional steel plastic grid 13 includes a double layer bidirectional steel plastic grid upper layer 10 and a double layer bidirectional steel plastic grid lower layer 12. The gap of the upper layer 10 of the double-layer bidirectional steel-plastic grid is filled with a thick fine-grained soil protection layer 9, the thickness is about 20mm, the gap of the lower layer 12 of the double-layer bidirectional steel-plastic grid is filled with a medium coarse sand protection layer 13, and the thickness is about 20mm, so that the internal EPS heat insulation plate 11 and the internal filler of the soil body are prevented from being adhered to prevent the heat insulation plate from being damaged.
The frost heaving prevention soil layer 5 adopts non-frost heaving middle sand and coarse sand; the frost heaving sensitive soil layer 6 supplements water by utilizing the ambient temperature and the supplementing soil body, and the earth surface is drained in advance before the basic soil layer is tamped by the plain soil tamping layer 7.
The embodiment of the invention also provides a construction method for the frozen soil foundation pavement built-in snow melting heat insulation system, which can be used for construction and paving according to JGT/T D31-06-2017 technical Specification of design and construction Specification of seasonal frozen soil region roads. Namely, a double-lane road section, the road width of which is divided into 1m (road shoulder) +1.5m (left side curb belt) +2 x 3.75m (lane) +1.5m (right side curb belt) +1m (road shoulder), and the snow melting and heat insulating device is arranged according to different road surface sizes in the actual working condition of the site.
The method comprises the following steps:
step (1), firstly cleaning frozen soil roadbed, draining earth surface, secondly, treating soft foundation to prevent non-uniform settlement of roadbed, treating soft foundation with low-fill shallow-excavated section and filling soil within 2 meters, reinforcing roadbed for a section of roadbed with poor soil condition to prevent fracture, tamping base layer with plain soil to obtain plain soil tamping layer 7 with tamping height of 200mm,
and (2) supplementing water by utilizing the ambient temperature and the supplementing soil body, and paving a frost heaving sensitive soil layer 6 with the thickness of 200mm by a certain water supplementing process, wherein the soil body can be ensured to generate plastic deformation so as to keep the construction soil body in a frozen state.
And (3) backfilling pile foundations for 300mm on the road subgrade in the frozen soil area by utilizing non-frost-swelling medium sand and coarse sand to form an anti-frost-swelling soil layer 5.
Step (4), cleaning the surface of the frost-proof swelling soil layer 4, paving double-layer bidirectional steel-plastic grids 10 and 12, paving partition hanging lines according to a construction pavement, fixing by using U-shaped nails (4 nails are used for each meter wide and are uniformly fixed at a distance), and paving by pulling manually or mechanically, wherein the longitudinal and transverse tensile strength of the two-layer steel-plastic grids 10 and 12 is more than 80KN/m, the elongation is less than or equal to 3%, the width is not less than 4.0m, meanwhile, during paving, the steel-plastic grids are uniformly tensioned, and the adjacent two grids are overlapped at the juncture of the two grids, wherein the transverse overlap width is 20cm, and the longitudinal overlap width is 15cm; meanwhile, a middle coarse sand layer and thick fine soil are filled in gaps of the upper layer steel-plastic grille, the inner EPS heat insulation board 11 and the soil body inner filler are prevented from being adhered to prevent the heat insulation board from being damaged, the EPS heat insulation board 11 is spliced according to the actual size of the steel-plastic grille after the heat insulation board is paved, an adhesive is adopted at the splicing position, a carbon fiber heating wire 8 (shown in fig. 3) is paved after the bonding is finished, the carbon fiber heating wire 8 is paved according to a 4U shape, then the position is fixed by an emulsifying agent, the upper layer bidirectional steel-plastic grille is covered above the carbon fiber heating wire 8 after the mounting is finished and is meshed with the lower layer bidirectional steel-plastic grille, a single-layer 20mm thick fine soil protection layer is paved to prevent the heat insulation board from being in direct contact with the roadbed filler, and a layer of fine sand is paved at the upper surface of the double-layer bidirectional steel-plastic grille to protect the carbon fiber heating wire 8 and the EPS heat insulation board 11.
According to the actual engineering, if only partial ground frozen layer needs to be eliminated, namely, when partial frozen layer can be reserved on the heat preservation basis, the thickness of the heat preservation layer can be calculated according to the following formula:
R n ＝nR 0 (2)
wherein: delta n In order to eliminate the thickness of the heat insulation material required by the partial foundation frozen layer, the unit is m; alpha w Is the volume water content, lambda x For the thickness of frozen soil, R n To eliminate theThe thermal resistance value of the heat preservation foundation required by removing part of the frozen layer of the foundation is shown as m 2 .℃/W，δ c Is of thermal conductivity coefficient lambda c Is the thermal resistance value of the material, n is the proportion of the design requirement to eliminate the frozen layer to the thickness of the natural frozen layer, R 0 Is EPS thermal resistance.
The double-layer bidirectional steel-plastic composite gratings 10 and 12 are paved between the graded gravel layer 3 and the frost heaving prevention soil layer 5, the actual-size pavement is paved according to the pavement construction traffic lane by 3.75mX3.75m/block, and the embedded position of the device is 240mm away from the pavement.
The power cord is installed inside EPS heat insulating board excavation recess, draws forth to the switch board by EPS heat insulating board side, and unified allotment control work by the switch board. The carbon fiber heating wire 8 is laid below a track belt of the frozen soil pavement, and the track belt is positioned on a heating road section.
Step (5), mixing and stirring crushed stones with different particle sizes and stone chips, wherein the crushing value of coarse aggregates is not more than 30%, the content of needle-shaped particles is not more than 20%, and materials such as coarse, medium and small crushed stone aggregates and stone chips are required to meet the specified grading requirements, and the preparation steps are as follows: the construction management of 20-30mm broken stone, 10-20mm broken stone, 5-10 mm broken stone and 1-5mm broken stone is paved according to the requirements of actual working conditions on site to form a graded broken stone layer 3 with the thickness of 100mm.
And (6) casting concrete on site on the graded broken stone layer 3 to form the concrete layer 2, selecting a shaping steel mould with the strength grade of C30 and the length of 300mm and the width of 50-60mm for a construction site, needing to have enough rigidity, then performing mechanical or manual paving, forming by using a flat vibrator, and trimming or cleaning the formed permeable concrete surface. In order to prevent surface pores from being polluted by silt during the maintenance of the concrete pavement, cleaning and pore blocking cleaning are required in time, and purging and high-pressure flushing are performed by a fan.
Step (7), mixing an SMA asphalt mastic gravel mixture, a 1SAC multi-gravel asphalt mixture layer and an OGFC open graded asphalt wearing layer, and filling and wrapping asphalt mastic cement binder consisting of asphalt, mineral powder and a fiber stabilizer into the surface of the mineral aggregate and the pore volume of a coarse aggregate framework to form the multi-gravel asphalt mixture layer 1 with the porosity of 2-4%, wherein the thickness of the multi-gravel asphalt mixture layer is 30mm.
And (8) paving gravel layers with the grain diameter of about 7cm and the thickness of 5cm on two sides of the snow melting heat insulation system after construction, so that the roadbed heat dissipation is facilitated, meanwhile, the solar radiation in warm seasons is stronger, the heat insulation effect of the gravel layers is achieved, and the temperature of the bottom of the gravel layers is obviously lower than that of the side slope of the common roadbed.
According to weather conditions and snowfall data in permafrost regions, setting snow melting parameters, and before the conditions of ambient temperature and freeze thawing occur, starting a carbon fiber heating wire in the device in advance to work, and stopping the carbon fiber heating wire after the snow melting is finished.
The relevant conclusions from the experiments were as follows: the heat insulation plate has the advantages that the heat insulation plate is high in heat insulation performance, the temperature of the upper part of the EPS plate is higher than the temperature of the lower part of the EPS plate in warm seasons, the heat can be effectively prevented from being transmitted downwards, meanwhile, the temperature difference between the upper part and the lower part of the EPS plate is about 12 ℃, the heat insulation plate has good heat insulation performance, the temperature of the upper part of the EPS heat insulation plate is lower than the temperature of the lower part of the EPS plate in cold seasons, the cold quantity can be effectively prevented from being transmitted downwards, therefore, the EPS heat insulation plate can be used for insulating heat and also can be used for insulating cold, in actual engineering use, the influence of construction seasons and the influence of construction disturbance on the effect of the heat insulation plate on the roadbed can be fully considered, the cold storage quantity inside the roadbed soil body can be greatly increased, and the heat insulation layer is laid to be an effective way for protecting the thawing of permafrost and engineering stability. The heat insulation layer can reduce the actual filling height of the foundation, is an engineering measure with reliable technology and certain economical efficiency, and can reduce or eliminate frost heaving of foundation soil due to the action of the EPS heat insulation plate, so that the possibility of related problems such as freezing and thawing of pavement in permafrost areas is greatly reduced; meanwhile, the built-in carbon fiber heating wire can accurately melt the snowfall of the vehicle running track of the road surface in the permafrost region in real time, and resource waste can be avoided.
According to the invention, actual construction is carried out according to actual engineering, namely, the actual working condition is that the multi-frozen soil structure is selected to be rich frozen soil, full frozen soil and multi-frozen soil with layered or integral structure, and the multi-frozen soil temperature of the road section is higher. In the degradation phase, it is extremely unstable. The treatment principle for permafrost is as follows: adopting the method for protecting the frozen soil and controlling the melting rate. And carrying out corresponding design measures. According to comparative analysis, the EPS heat insulation board is paved, the upper limit of permafrost is reduced to move downwards, the permafrost ablation process is greatly relieved, the road stability is kept, the deformation is reduced, meanwhile, the pavement of a broken roadbed is utilized, the thermal boundary condition of the broken roadbed can be changed, and the annual average temperature of a slope surface and the annual worse slope surface temperature can be effectively reduced.
The foregoing is merely illustrative embodiments of the present invention, and the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a built-in snow melt thermal insulation system to frozen soil ground road surface which characterized in that: the snow melting heat insulation device is formed by wrapping EPS heat insulation plates and carbon fiber heating wires by double-layer bidirectional steel plastic grids, the double-layer bidirectional steel plastic grids comprise a double-layer bidirectional steel plastic grid upper layer and a double-layer bidirectional steel plastic grid lower layer, thick fine-grained soil protection layers are filled in gaps of the double-layer bidirectional steel plastic grids, and medium coarse sand protection layers are filled in gaps of the double-layer bidirectional steel plastic grids lower layer.
2. The built-in snow melting and heat insulating system for frozen soil foundation pavement according to claim 1, wherein: the snow melting heat insulation device is set to be 3.5m multiplied by 0.125m multiplied by 3.5m according to the actual road conditions in the frozen soil area.
3. The built-in snow melting and heat insulating system for frozen soil foundation pavement according to claim 1, wherein: the carbon fiber heating wire of the built-in carbon fiber heating wire of the snow melting heat insulation device is laid below a frozen soil pavement track belt, and the track belt position is a heating road section.
4. The built-in snow-melting heat insulation system for frozen ground road surface according to claim 3, wherein: the snow melting heat insulation device is characterized in that carbon fiber heating wires are arranged in road wheel track belts in a U-shaped mode, 4U-shaped carbon fiber heating wires are arranged, each 4U-shaped carbon fiber heating wire is composed of carbon fiber heating wires, the size of each wheel track belt is 3.5 multiplied by 0.8m, and the arrangement interval of the carbon fiber heating wires is 100mm.
5. The built-in snow melting and heat insulating system for frozen soil foundation pavement according to claim 1, wherein: the multi-broken stone asphalt mixture layer is 1-3cm thick, is prepared by mixing an SMA asphalt mastic asphalt mixture, a 1SAC multi-broken stone asphalt mixture layer and an OGFC open graded asphalt wearing layer, and is prepared by filling and wrapping asphalt mastic cement binder consisting of asphalt, mineral powder and a fiber stabilizer in the pore volume of a mineral aggregate framework and the surface of the mineral aggregate to form the multi-broken stone asphalt mixture layer with the porosity of 2-4%.
6. The built-in snow melting and heat insulating system for frozen soil foundation pavement according to claim 1, wherein: the graded broken stone layer is prepared by mixing broken stone and stone scraps, and the four materials are respectively as follows: 20-30mm broken stone, 10-20mm broken stone, 5-10 mm broken stone and 1-5mm stone chips are paved according to construction requirements.
7. The built-in snow melting and heat insulating system for frozen soil foundation pavement according to claim 1, wherein: the frost heaving prevention soil layer is formed by backfilling non-frost heaving middle sand and coarse sand.
8. A construction method for a frozen ground foundation pavement built-in snow-melting heat insulation system as recited in any one of claims 1 to 7, comprising the steps of:
firstly, cleaning a frozen soil roadbed, carrying out drainage treatment on the earth surface, secondly, treating a soft foundation, and carrying out basic layer tamping on a certain section of roadbed with poor soil conditions by using plain soil to form a plain soil tamping layer;
step (2), supplementing water by utilizing the ambient temperature and the supplementing soil body, and paving a frost heaving sensitive soil layer;
step (3), backfilling pile foundations on the road subgrade in the frozen soil area by utilizing non-frost-swelling medium sand and coarse sand to form an anti-frost-swelling soil layer;
cleaning the surface of the frost heaving prevention soil layer, paving double-layer bidirectional steel-plastic grids, overlapping adjacent two grids at the juncture of the two grids, filling a middle coarse sand layer and thick fine soil at the gaps of the upper and lower steel-plastic grids, splicing an EPS heat insulation plate according to the actual size of the steel-plastic grids after paving, bonding the spliced part by adopting an adhesive, paving a carbon fiber heating wire after bonding, covering the upper-layer bidirectional steel-plastic grid above the carbon fiber heating wire after mounting, and occluding and fixing the upper-layer bidirectional steel-plastic grid and the lower-layer bidirectional steel-plastic grid;
step (5), after the double-layer bidirectional steel-plastic grid is paved, mixing and stirring crushed stones with different particle sizes and stone chips, wherein the crushing value of coarse aggregates is not more than 30%, the content of needle-shaped particles is not more than 20%, and the materials such as coarse, medium and small crushed stone aggregates, stone chips and the like are required to meet the specified grading requirements, and the preparation steps according to 4 grades are as follows: paving 20-30mm broken stone, 10-20mm broken stone, 5-10 mm broken stone and 1-5mm broken stone according to the actual working condition requirements on site to form a graded broken stone layer;
step (6), casting concrete on site on the graded broken stone layer to form a concrete layer;
step (7), mixing an SMA asphalt mastic gravel mixture, a 1SAC multi-gravel asphalt mixture layer and an OGFC open graded asphalt wearing layer, and filling and wrapping an asphalt mastic cement binder consisting of asphalt, mineral powder and a fiber stabilizer into the surface of the mineral aggregate and the pore volume of a coarse aggregate framework to form the multi-gravel asphalt mixture layer with the porosity of 2-4%.
9. The construction method for the built-in snow melting heat insulation system of the frozen soil foundation pavement according to claim 8, wherein the double-layer bidirectional steel-plastic composite grid is paved between the graded gravel layer and the frost heaving soil layer, the actual-size pavement is paved according to a pavement construction traffic lane by 3.75mx3.75m/block, and the embedded position of the device is 240mm away from the pavement.
10. The construction method for the snow-melting heat insulation system built-in to the frozen ground road surface according to claim 8, further comprising:
and (8) paving particle size gravel layers on two sides of the snow melting heat insulation system after construction.
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| CN202310432960.4A CN116590983A (en) | 2023-04-21 | 2023-04-21 | Built-in snow melting heat insulation system for frozen soil foundation pavement and construction method thereof |
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| CN202310432960.4A CN116590983A (en) | 2023-04-21 | 2023-04-21 | Built-in snow melting heat insulation system for frozen soil foundation pavement and construction method thereof |
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