CN104480821B - For cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed - Google Patents
For cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed Download PDFInfo
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- CN104480821B CN104480821B CN201410758866.9A CN201410758866A CN104480821B CN 104480821 B CN104480821 B CN 104480821B CN 201410758866 A CN201410758866 A CN 201410758866A CN 104480821 B CN104480821 B CN 104480821B
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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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Abstract
The present invention relates to a kind of for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed.Under the conditions of the large scale roadbed of highway, roadbed overall width reaches more than 20m, and existing ever-frozen ground Disposal Measures such as sheet block-stone embankment, ventilation pipe foundation etc. the most all also exist respective limitation.The present invention is equipped with fill subgrade, thermal resistance conduction structure plate and road surface structare layer the most successively；Thermal resistance conduction structure plate is adiabator plate, and inside is laid with vertical conduction cooling pipe, and conduction cooling pipe height is identical with thermal resistance conduction structure plate thickness, and insulation material top has heat sink, bottom to have absorber plate, plays expansion suction, the effect of area of dissipation；Thermal resistance conduction structure plate is cell board, is laid by overlapping mode between plate and plate.This thermal resistance conduction structure can effectively increase the cold entered in roadbed body, and the distribution of cold evenly, action effect becomes apparent from, thus reaches to protect the effect of ever-frozen ground under roadbed.
Description
Technical field
The invention belongs to transport development technical field, be specifically related to a kind of for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed.
Background technology
The national expressway network planning that in January, 2004, State Council passed through, includes Beijing-Lhasa highway (be called for short capital and hide highway) in country " 7918 freeway net " as the highway that uniquely enters into Tibet, and ranks one of 7 capital radioactive ray." 71118 " freeway net total scale 11.8 ten thousand km that the national highway network planning that in June, 2013 is newly issued is drawn, its Zhong jing is hidden the last section "GermuLasa" section (being called for short Qinghai-Tibet at a high speed) of building of highway and has been included 12 later stage construction plans in.Therefore, the main task that Qinghai-Tibet highway will become during following Qinghai-Tibet or even national pivotal infrastructure is built.
Qinghai-Tibet highway is as " backbone " engineering of provinces and regions, Qinghai-Tibet two, and it is built safeguarding national security, and safeguards territorial integrity, and improves emergency response capabilities, promotes Tibet national unity progress, it is achieved Tibet has important strategic importance with interior synchronize enjoying a fairly comfortable life.Yet with Qinghai-Tibet Platean special geography, weather conditions and distributed the Permafrost Area more than 550km along the line, can Qinghai-Tibet be made to still suffer from a high speed building and such as a difficult problem for He Jianshe, it builds difficulty be that conventional Qinghai-Tibet Highway engineering other any one engineerings interior are cannoted analogy.
The common Class II highway that highway wide cut roadbed is more conventional, maximum difference is that width of subgrade increases, asphalt concrete pavement width is caused to increase therewith, research in the past shows, highway is when width of roadway relatively common road increases by 1 times, annual heat flow in bottom surface increases by 60%, and the hot-fluid increased is concentrated mainly on the centre in embankment face, and produce " heat build-up effect ", the catagen speed causing ever-frozen ground accelerates 0.6 times, this relation will not weaken because depth of fill increases, at Permafrost Area building highway, more stern challenge will be faced, engineering construction must fully be paid attention to.Highway subgrade cross-sectional design is had and extremely clearly requires by China's " highway technical standard ".For integral subgrade cross section, roadbed overall width is between 24.5～26.0m, and for separated subgrade, single width width of subgrade is 13.0m.
By regulation and control convection current, radiate or conduct and comprehensive regulation carrys out cooling foundation.It it is the method that current Permafrost Area highway is conventional, the engineering measure wherein regulating and controlling convective methods includes roadbed at the bottom of block ground mass, block (broken) stone roadbed for slope protection and duct-ventilated embankment etc., the engineering measure of regulation and control method of radiating includes sunshade, sunshading board roadbed, the engineering measure of regulation and control transmission method includes hot-mix recycling, water suction diatomite bank protection or hot semi-conducting material roadbed etc., the method of comprehensive regulation such as viaduct etc., these achievements in research mainly complete under conditions of highway subgrade width only 10m, it is mainly used in Qinghai-Tibet Highway, on the narrow section roads such as Class II highway and Qinghai-Tibet Railway such as blue or green Kanggong road.
Different from yardstick due to road structure to highway, " thermal etching " is even more serious.Having that the existing protection of permafrost subgrade stability engineering in Permafrost Area mainly uses at present is following several:
Sheet block-stone embankment behaviour in service under ever-frozen ground region two-stage and following highway subgrade is relatively good, achieves a series of achievement in research.But under the conditions of large scale roadbed, width of roadway is significantly increased, on the premise of maintainance block rock layers Rational Thickness, embankment zone line would become hard to free convection occur, the soil body is played cooling effect and also will weaken.And how the Con trolling index such as the compactness of sheet block-stone embankment sheet block stone layer, porosity control and detect to be all the most unsolved difficult problem in construction.
At present the ventilation pipe foundation of domestic and international application all concentrates on two grades and following low-grade highway, does not also carry out in high-speed broad-width roadbed, and ventilation pipe foundation applicability in highway wide cut roadbed need research.In highway, owing to roadbed wide cut increases considerably, in roadbed, ventilation duct length increases, and the convection action of inner air tube will weaken, and the active cooling function of ventilation duct will be affected.And weaken due to ventilation duct length, convection action at warm season, hot-air is difficult to get rid of after entering, and causes roadbed caloric receptivity to increase.Therefore ventilation pipe foundation in highway wide cut roadbed is lowered the temperature the improvement of the design parameters such as ventilation duct aperture under usefulness and wide cut roadbed and research also has substantial amounts of need of work to carry out.
Hot pin+XPS plate is composite road bed can play the effect that warming plate is heat insulation at warm season, can play the effect of hot pin active cooling at cold season, reach the resultant effect that warm season is heat insulation, cold season persistently inputs cold.But, under the conditions of wide cut roadbed, warm season warming plate can only stop certain heat to input, remaining heat still constantly transmits under roadbed, although the cold in air is constantly brought into roadbed to cool down roadbed by cold season hot pin, but due to the function influence radius of hot pin, hot pin can only produce impact to a range of soil body around hot pin, and the roadbed impact on place in particularly road, hot pin position farther out is less.So, roadbed constantly saves bit by bit heat at warm season, and cold season cold inputs not and under the influence of skewness, will necessarily produce serious disease.
Therefore, for the large scale roadbed condition of highway, and the limitation of existing ever-frozen ground Disposal Measures, the present invention is proposed.
Summary of the invention
It is an object of the invention to provide a kind of for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed, have heat insulation and conduction cooling effect concurrently, make each position of roadbed all can produce the heat insulation resultant effect cold with suction.
The technical solution adopted in the present invention is:
For cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed, it is characterised in that:
It is equipped with fill subgrade and road surface structare layer the most successively；
Being laid with thermal resistance conduction structure plate on fill subgrade, under road surface structare layer, thermal resistance conduction structure plate is adiabator plate, and inside is laid with numerous vertical conduction cooling pipe, and conduction cooling pipe height is identical with thermal resistance conduction structure plate thickness；
On thermal resistance conduction structure plate, end face has heat sink, bottom surface to have absorber plate.
The conduction cooling pipe of thermal resistance conduction structure intralamellar part is respectively arranged to align or stagger and is evenly arranged, and also or in zigzag arranges.
Thermal resistance conduction structure plate is cell board, is laid by overlapping mode between plate and plate.
The invention have the advantages that
Present configuration is simple, with low cost, economical and practical.The present invention is Prefabricated, and intensity is high, good integrity, and roadbed under plate only need to be compacted by job site on request, can be layed on roadbed by this thermal resistance conduction structure, uses bridging arrangement, longitudinally and laterally lay successively along roadbed between plate and plate.
Thermal resistance conduction cooling plate is material based on industry heat-barrier material, plays heat insulation effect.Being laid with conduction cooling pipe on every block of plate, one layer of heat sink is laid at the top of plate, and one layer of absorber plate is laid in the bottom of plate.When thermal resistance conduction structure head temperature is less than bottom temp, in roadbed body, heat enters in conduction cooling pipe by absorber plate, and conduction cooling pipe by heat sink, transfers heat to the top of thermal resistance conduction structure again, to roadbed external diffusion, reaches to cool down the purpose of roadbed.
Can accomplish in the range of the present invention lays warm season reduce enter the heat of roadbed, cold season increases the cold entering roadbed, reach actively to lower the temperature and passive protection combine.For the roadbed of Permafrost Area, this thermal resistance conduction structure can effectively increase the cold entered in roadbed body, and the distribution of cold evenly, action effect becomes apparent from, thus reaches to protect the effect of ever-frozen ground under roadbed.
Accompanying drawing explanation
Fig. 1 is present configuration figure.
Fig. 2 is thermal resistance conduction structure plate side view.
Fig. 3 is that each misarrangement of conduction cooling pipe is opened and is evenly arranged (blossom type) figure.
Fig. 4 be conduction cooling pipe be zigzag layout drawing.
Fig. 5 is that conduction cooling pipe is respectively arranged alignment and is evenly arranged figure.
Fig. 6 is conduction cooling tube side view.
In figure, 1-thermal resistance conduction structure plate, 2-road surface structare layer, 3-Roadbed Soil, 4-insulation material, 5-conduction cooling pipe, 6-radiating end, 7-heat absorbing end, 8-absorber plate, 9-heat sink, 10-working medium.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention will be described in detail.
The present invention relates to is a kind of for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed, be uniformly distributed in roadbed warm season can heat insulation, cold season can the thermal resistance conduction structure of conduction cooling.In roadbed, lay insulation material, increased the thermal resistance of roadbed by insulation material, to reach in the heat insulation effect of warm season；Meanwhile, in every block of insulation material, being laid with conduction cooling pipe, one layer of heat sink is laid at the top of plate, and one layer of absorber plate is laid in the bottom of plate.The heat absorbing end of conduction cooling pipe is connected with absorber plate, and radiating end is connected with heat sink.
During warm season, owing to bituminous paving caloric receptivity is relatively big, and outside bulk temperature is higher, and warming plate head temperature is higher than bottom temp, and warming plate plays heat insulation effect, and in warming plate, conduction cooling pipe does not works；During cold season, road surface caloric receptivity reduces, and outside air temperature is relatively low, warming plate plays every cold-working use, but owing to temperature at the bottom of warming plate is higher than plate top temperature, conduction cooling pipe is started working, by the absorber plate bottom warming plate, to be delivered to the heat sink at conduction cooling pipe top after heat absorption in roadbed body, heat is acted on by cool ambient air at plate top, is constantly distributed to air.Taking out of at warming plate heat at the bottom of cold, conduction cooling pipe is constantly by warming plate, and during air distributes, this insulation construction has reached that warm season is heat insulation, the thermal resistance conduction structure of cold season conduction cooling.
Being heat absorbing end bottom conduction cooling pipe, top is radiating end, built-in be heated volatile, the working medium of easily condensation after catching a cold, under the effect of the conduction cooling pipe top and the bottom temperature difference and gravity, complete the exchange of heat and extraneous cold in roadbed.Some conduction cooling pipes can be laid as required in one piece of thermal resistance conduction structure, the shapes such as quincunx, zigzag can be set to by cloth according to refrigeration requirement, connect with absorber plate bottom conduction cooling pipe, endotherm area can be increased, top connects with heat sink, area of dissipation can be increased, reach the effect of conduction cooling simultaneously in the range of the present invention lays.
Concrete structure is:
It is equipped with fill subgrade 3 and road surface structare layer 2 the most successively.Thermal resistance conduction structure plate 1 it is laid with on fill subgrade 3, under road surface structare layer 2, thermal resistance conduction structure plate 1 is adiabator plate, insulation material is the industrial foam plastics such as XPS plate, there is higher compression strength, insulation material, as the material of main part of thermal resistance conduction structure, is laterally layed in roadbed body.Inside, according to refrigeration capacity requirement, can use multiple laying mode, lays vertical conduction cooling pipe 5, and conduction cooling pipe 5 height is the most identical with thermal resistance conduction structure plate 1 thickness.Heat sink 9 is arranged at insulation material top, and absorber plate 8 is arranged at bottom.
According to refrigeration requirement, some conduction cooling pipes 5 of pre-plugged in every block of insulation material, after conduction cooling pipe 5 and insulation material one-shot forming, upper and lower end face adds heat sink 9 and absorber plate 8, forms an overall thermal resistance conduction structure.Conduction cooling pipe 5 bottom is heat absorbing end 7, plays the effect of heat at the bottom of baffle；Top is radiating end 6, plays and dissipates heat that evaporation ends absorbs in air, thus reaches to cool down the effect of roadbed temperature at the bottom of warming plate.Thermal resistance conduction structure plate 1 is cell board, is laid by overlapping mode between plate and plate.In the range of thermal resistance conduction structure plate 1 is laid, can accomplish that warm season plays the effect that warming plate is heat insulation, cold season can play the effect of hot pin active cooling, reaches warm season thermal resistance, cold season and persistently inputs the one-way heat conduction function of cold.
Present disclosure is not limited to cited by embodiment, and the conversion of any equivalence that technical solution of the present invention is taked by those of ordinary skill in the art by reading description of the invention, the claim being the present invention is contained.
Claims (3)
1. for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed, it is characterised in that:
It is equipped with fill subgrade (3) and road surface structare layer (2) the most successively；
Thermal resistance conduction structure plate (1) it is laid with on fill subgrade (3), under road surface structare layer (2), thermal resistance conduction structure plate (1) is adiabator plate, inside is laid with numerous vertical conduction cooling pipe (5), and conduction cooling pipe (5) height is identical with thermal resistance conduction structure plate (1) thickness；
The upper end face of thermal resistance conduction structure plate (1) has heat sink (9), and bottom surface has absorber plate (8).
It is the most according to claim 1 for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed, it is characterised in that:
The conduction cooling pipe (5) of thermal resistance conduction structure plate (1) inside respectively row aligns or staggers and is evenly arranged, and also or in zigzag arranges.
It is the most according to claim 2 for cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed, it is characterised in that:
Thermal resistance conduction structure plate (1) is cell board, is laid by overlapping mode between plate and plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410758866.9A CN104480821B (en) | 2014-12-12 | 2014-12-12 | For cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410758866.9A CN104480821B (en) | 2014-12-12 | 2014-12-12 | For cooling down the thermal resistance conduction structure that more than 20m large scale is frozen earth roadbed |
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| CN104480821A CN104480821A (en) | 2015-04-01 |
| CN104480821B true CN104480821B (en) | 2016-09-07 |
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| CN114150545A (en) * | 2021-12-28 | 2022-03-08 | 中山大学 | A heat damage prevention and cure system for frozen soil road bed |
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| FI91429C (en) * | 1988-04-11 | 1994-06-27 | Esko Poentynen | Road or airport structure |
| CN100419160C (en) * | 2002-11-27 | 2008-09-17 | 中国科学院寒区旱区环境与工程研究所 | Thermal-insulating cold-conductive device for protecting frozen soil |
| CN202401364U (en) * | 2011-12-29 | 2012-08-29 | 中交第一公路勘察设计研究院有限公司 | Heat stick and heat-insulating plate combined integral roadbed for highway in frozen earth area |
| CN204325836U (en) * | 2014-12-12 | 2015-05-13 | 中交第一公路勘察设计研究院有限公司 | A kind of for cooling the frozen earth roadbed thermal resistance conduction structure of more than 20m large scale |
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