CN201678924U - Permeable-wall ventilation tube-block and detritus layer cooling and heat-insulation composite roadbed - Google Patents
Permeable-wall ventilation tube-block and detritus layer cooling and heat-insulation composite roadbed Download PDFInfo
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- CN201678924U CN201678924U CN 201020142789 CN201020142789U CN201678924U CN 201678924 U CN201678924 U CN 201678924U CN 201020142789 CN201020142789 CN 201020142789 CN 201020142789 U CN201020142789 U CN 201020142789U CN 201678924 U CN201678924 U CN 201678924U
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Abstract
The utility model discloses a permeable-wall ventilation tube-block and detritus layer cooling and heat-insulation composite roadbed, which structurally consists of a permeable-wall ventilation tube, a block and detritus layer, geotextile, a heat-insulation layer and roadbed filling. The block and detritus layer is paved on the compacted natural ground surface, the permeable-wall ventilation tube is buried in the top of the block and detritus layer, and then the geotextile, the heat-insulation layer and the roadbed filing are sequentially paved on the block and detritus layer. By aid of the permeable-wall ventilation tube, the temperature of the top of the block and detritus layer is reduced, temperature difference between an upper boundary and a lower boundary of the block and detritus layer is increased, natural convection of the block and detritus layer in cold seasons is strengthened, cold energy absorbing energy of the roadbed in the cold seasons can be increased, heat absorbing quantity in warm seasons is effectively controlled due to heat-insulation characteristics of the heat-insulation layer, and net discharged heat of the roadbed within a freezing and thawing cycle is increased greatly, thereby reducing temperature of underlying soil of wide high-level roadbeds, balancing temperature fields, increasing permafrost table, and meeting special requirements upon stability of wide high-level roadbeds in high-temperature permafrost regions.
Description
Technical field
The utility model relates to a kind of road structure form, especially a kind of transparent wall vent pipe-pipe-massive stone layer cooling and insulating composite road bed form of structure, it can reduce High-Grade Highway Subgrade bottom frozen soils temperature effectively, and the lifting frozen soil upper limit is guaranteed frozen earth roadbed long-time stability.
Background technology
Frozen soil is meant the soil body and the rock that has subzero temperature and contain ice, mainly is divided into ever-frozen ground and seasonal frozen ground by life span.China's ever-frozen ground area accounts for 22.4% of area, is third place in the world frozen soil big country.Owing to the existence of icing and not freezing water, its character is extremely complicated and very responsive to temperature in the frozen soil.Highway engineering construction and global warming all can cause the intensification of frozen soil, bring the thaw collapse disease to roadbed, the stability of serious harm ever-frozen ground district road.
Summary of the invention
In order effectively to reduce the temperature of ever-frozen ground district advanced road roadbed, safeguard the long-term stability of roadbed, the purpose of this utility model is to provide a kind of transparent wall vent pipe-pipe-massive stone layer cooling and insulating composite road bed.This road structure is optimized combination by the cooling effect to transparent wall vent pipe and pipe-massive stone layer, learns from other's strong points to offset one's weaknesses mutually, reduces advanced road roadbed bottom frozen soils temperature, and the lifting ever-frozen ground upper limit is guaranteed the stable for many years of wide cut advanced road roadbed.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of transparent wall vent pipe-pipe-massive stone layer cooling and insulating composite road bed is to be banketed by transparent wall vent pipe, pipe-massive stone layer, geotextiles, insulation layer and roadbed to constitute.Making pipe-massive stone layer on the natural surface of compacting; Laterally imbed the top of pipe-massive stone layer along roadbed with the transparent wall vent pipe of saturating cinclides eye; The external diameter of transparent wall vent pipe is 30～80cm, pipe thickness is 2～10cm, the aperture of eyelet is 3～10cm, percent opening is 10%～40%, clear spacing is 1～5 times a external diameter of pipe between tube and tube, lays geotextiles on the pipe-massive stone layer, and the thickness of pipe-massive stone layer is≤3.0m, the particle diameter of pipe-massive stone layer is 10cm～50cm, lays insulation layer and making embankment filled soil on geotextiles successively.
The beneficial effect of advantage of the present utility model and generation is:
1, cooling-down effect is fairly obvious.The utility model is optimized reinforcement by the cooling effect with transparent wall vent pipe and pipe-massive stone layer, learns from other's strong points to offset one's weaknesses mutually; Combine with the heat-insulation and heat-preservation characteristic of insulation layer again, give full play to advantage separately, when realizing that cold season sucks cold energy in a large number, effectively limit the caloric receptivity of warm season, significantly improve the clean thermal discharge of roadbed in a freezing and thawing cycle, thereby reduced the underlie temperature of frozen soil of roadbed more effectively.Therefore, this roadbed can promote the artificial upper limit of ever-frozen ground, and the ever-frozen ground under the protection roadbed avoids frost heave and thaw collapse to take place, and obtains good effect.
2, be convenient to construction.The piece rubble can be drawn materials nearby, and the transparent wall vent pipe directly transports on-the-spot the installation to after can be prefabricated.Roadbed making operation is simple, easy construction.
3, the utility model need not any external impetus facility, and is pollution-free, preserves the ecological environment.The piece rubble is drawn materials conveniently, and is with low cost; The transparent wall vent pipe can be prefabricated, is easy to construction and maintenance, can not produce big artificial disturbance to frozen soil, can satisfy the specific (special) requirements of high temperature, high ice content Permafrost Area engineering stability.
4, aspect range of application, it can directly apply to the high temperature permafrost region, lay in the wide cut advanced road engineering of dark-coloured pavement.Carried out contrast test under identical test conditions: the block stone layer roadbed of promptly setting up the transparent wall vent pipe is compared with the block stone layer roadbed of having set up common air chimney, the roadbed of having set up the transparent wall vent pipe is than low 1～2 ℃ of the roadbed temperature of setting up common air chimney, thereby produces reliable and stable engineering effort.
Description of drawings
Fig. 1 is the utility model cross-sectional drawing.
Fig. 2 is the utility model skiagraph.
The isollaothermic chart of the composite road bed middle discontinuity surface of common air chimney-block stone layer when Fig. 3 is the lowest temperature.
The isollaothermic chart of the composite road bed middle discontinuity surface of transparent wall vent pipe-block stone layer when Fig. 4 is the lowest temperature.
Fig. 5 is two groups of composite road bed center line bottom temps curves over time, and wherein: a curve is that transparent wall vent pipe-block stone layer is composite road bed, and the b curve is that common air chimney-block stone layer is composite road bed.
The specific embodiment:
Below in conjunction with accompanying drawing, will be described further again the utility model.
Embodiment 1
With reference to accompanying drawing 1, a kind of transparent wall vent pipe-pipe-massive stone layer cooling and insulating composite road bed application in broad width road.The top width of embankment filled soil is 23.0m.Roadbed is banketed by transparent wall vent pipe 1, pipe-massive stone layer 2, geotextiles 3, insulation layer 4 and roadbed and 5 constitutes; Making pipe-massive stone layer 2 on the natural surface 6 of compacting; Laterally imbed the top of pipe-massive stone layer 2 along roadbed with the transparent wall vent pipe 1 of saturating cinclides eye 7.The external diameter of transparent wall vent pipe 1 is 50cm, pipe thickness is 5cm, the aperture of saturating cinclides eye 7 is 10cm on the tube wall, percent opening is 20%, clear spacing is 150cm between tube and tube, and the thickness of pipe-massive stone layer 2 is 1.2m, and the particle diameter of pipe-massive stone layer is 10cm～30cm, on pipe-massive stone layer 2, lay geotextiles 3, on geotextiles, lay EPS insulation layer 4 and making embankment filled soil 5 more successively.
Be checking transparent wall vent pipe-pipe-massive stone layer cooling and insulating composite road bed validity that is applied to the wide cut advanced road, the utility model has carried out model testing in frozen soil engineering National Key Laboratory of Chinese Academy of Sciences cold area arid region environment and Engineering research institute.The physical dimension of test roadbed model is 1/15 of an actual roadbed, and correspondingly, a freezing and thawing cycle in the test is 1/24 of an actual freezing and thawing cycle.
Experimental rig is made up of chamber, temperature control system, ventilation system and data collecting system.Chamber is of a size of 8.00m * 1.84m * 2.70m, and casing is made up of the freezer warming plate; Temperature control system is made up of SANYO double end compressor unit, Computer Thermostat, freon liquid circulating line, evaporimeter and temperature pick up; Ventilation system is made up of thermantidote, acceleration fan, wind-speed adjusting device, return airway etc.; Data collecting system by temperature pick up, the DT500 number adopts instrument and computer is formed.
Average temperature of air in the test model case is-4.0 ℃, the temperature cycle is relatively poor to be 24 ℃, and the super bath bulb is set comes solar simulating radiation, model testing has been carried out totally 5 cycles such as 0～2 π, 2 π～4 π, 4 π～6 π, 6 π～8 π, 8 π～10 π altogether, and one-period is 15 days.
Carried out contrast test under identical test conditions: one group is that transparent wall vent pipe-block stone layer is cooling and insulating composite road bed; Another group is cooling and insulating composite road bed for common air chimney-block stone layer.
Result of the test such as Fig. 3～shown in Figure 5.
The isollaothermic chart of two groups of composite road bed middle discontinuity surfaces when Fig. 3 and Fig. 4 are the lowest temperature respectively.From Fig. 3 and Fig. 4, as can be seen, during the lowest temperature, all produce natural convection in two groups of roadbeds, shown in arrow among the figure.But convection intensity is different, and the isotherm degree of crook is big than the degree of crook of Fig. 3 in Fig. 4, and it shows that when the lowest temperature the more common air chimney-block stone layer of the composite road bed natural convection intensity of transparent wall vent pipe-block stone layer is composite road bed significantly is eager to excel.With-7.0 ℃ of isotherms in scheming is example, common air-duct composite roadbed in, it still is in position, roadbed middle and upper part; And in the transparent wall vent pipe is composite road bed, then dropped to the roadbed middle and lower part.This shows that because the effect of transparent wall vent pipe, the temperature at place, block stone layer coboundary is significantly reduced, and has increased the block stone layer upper and lower temperature difference, has therefore significantly strengthened the natural convection intensity of block stone layer inside.
Fig. 5 is two groups of composite road bed center line bottom temps curves over time.The superior cooling-down effect of the composite road bed a curve of the transparent wall vent pipe-block stone layer b curve composite road bed as seen from Figure 5 with respect to common air chimney-block stone layer.From on-test, the temperature of a curve that transparent wall vent pipe-block stone layer is composite road bed is lower than the composite road bed b curve of common air chimney-block stone layer all the time, and the rate of temperature fall of the composite road bed a curve of transparent wall vent pipe-block stone layer is higher than the composite road bed b curve of common air chimney-block stone layer.The maximum temperature difference of a, b curve reaches 6.43 ℃.As seen, the cooling-down effect of the composite road bed a curve of transparent wall vent pipe-block stone layer is much better than the composite road bed b curve of common air chimney-block stone layer.
Claims (1)
1. a transparent wall vent pipe-pipe-massive stone layer cooling and insulating composite road bed, be by transparent wall vent pipe (1), pipe-massive stone layer (2), geotextiles (3), insulation layer (4) and roadbed banket (5) constitute; It is characterized in that going up making pipe-massive stone layer (2) at the natural surface (6) of compacting; Laterally imbed the top of pipe-massive stone layer (2) along roadbed with the transparent wall vent pipe (1) of saturating cinclides eye (7); The external diameter of transparent wall vent pipe (1) is 30～80cm, pipe thickness is 2～10cm, the aperture of eyelet (7) is 3～10cm, percent opening is 10%～40%, clear spacing is 1～5 times a external diameter of pipe between tube and tube, lays geotextiles (3) on the pipe-massive stone layer, and the thickness of pipe-massive stone layer (2) is≤3.0m, the particle diameter of pipe-massive stone layer is 10cm～50cm, lays insulation layer (4) and making embankment filled soil (5) on geotextiles successively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020142789 CN201678924U (en) | 2010-03-25 | 2010-03-25 | Permeable-wall ventilation tube-block and detritus layer cooling and heat-insulation composite roadbed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201020142789 CN201678924U (en) | 2010-03-25 | 2010-03-25 | Permeable-wall ventilation tube-block and detritus layer cooling and heat-insulation composite roadbed |
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| CN201678924U true CN201678924U (en) | 2010-12-22 |
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| CN 201020142789 Expired - Fee Related CN201678924U (en) | 2010-03-25 | 2010-03-25 | Permeable-wall ventilation tube-block and detritus layer cooling and heat-insulation composite roadbed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818471A (en) * | 2010-03-25 | 2010-09-01 | 中国科学院寒区旱区环境与工程研究所 | Application of transparent wall vent pipe-massive stone layer cooling and insulating composite road bed in wide road |
| CN105755918A (en) * | 2014-12-17 | 2016-07-13 | 中国科学院寒区旱区环境与工程研究所 | Block stone layer slope protection roadbed with sun shading and ventilation cooling efficacy |
| CN107034756A (en) * | 2016-02-03 | 2017-08-11 | 中国科学院寒区旱区环境与工程研究所 | A kind of frozen earth roadbed structure of natural convection ventilation pipe |
-
2010
- 2010-03-25 CN CN 201020142789 patent/CN201678924U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818471A (en) * | 2010-03-25 | 2010-09-01 | 中国科学院寒区旱区环境与工程研究所 | Application of transparent wall vent pipe-massive stone layer cooling and insulating composite road bed in wide road |
| CN105755918A (en) * | 2014-12-17 | 2016-07-13 | 中国科学院寒区旱区环境与工程研究所 | Block stone layer slope protection roadbed with sun shading and ventilation cooling efficacy |
| CN105755918B (en) * | 2014-12-17 | 2018-07-31 | 中国科学院寒区旱区环境与工程研究所 | A kind of block stone layer roadbed for slope protection having sunshade and aeration-cooling effect |
| CN107034756A (en) * | 2016-02-03 | 2017-08-11 | 中国科学院寒区旱区环境与工程研究所 | A kind of frozen earth roadbed structure of natural convection ventilation pipe |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20170325 |