CN101289830A - Duct-ventilated embankment with chimney - Google Patents
Duct-ventilated embankment with chimney Download PDFInfo
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- CN101289830A CN101289830A CNA200810150063XA CN200810150063A CN101289830A CN 101289830 A CN101289830 A CN 101289830A CN A200810150063X A CNA200810150063X A CN A200810150063XA CN 200810150063 A CN200810150063 A CN 200810150063A CN 101289830 A CN101289830 A CN 101289830A
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Abstract
The invention relates to a pipeline ventilation roadbed with a chimney. The structure of the roadbed is characterized in that: roadbed filling used for filling and compacting is placed on compacted ground surface; the inside of the roadbed filling is provided with a horizontal ventilating pipe along the trend of the roadbed; the chimney is arranged on and runs through the ventilating pipe; the chimney is perpendicular to and higher than the top surface of the roadbed. The roadbed has the chimney arranged on the ventilating pipe, which fully utilizes the chimney effect that heat can be dissipated to the utmost extent in winter; due to the principle that the ventilating pipe does not work in summer, under the condition with no wind or unsmooth ventilation, the cooling capability of the pipeline ventilation roadbed is effectively improved. The roadbed realizes the cooling effect to the frozen soil on the lower part of the roadbed, upgrades the upper limit of the frozen soil, solves the damage on the roadbed which is caused by frost heave and thaw collapse produced in the freeze thawing process of a seasonal active layer, and guarantees the stability of the frozen soil roadbed for a plurality of years.
Description
Technical field
The present invention relates to a kind of structure of road, especially a kind of duct-ventilated embankment with chimney.It can reduce roadbed bottom frozen soils temperature effectively, and the lifting frozen soil upper limit improves frozen earth roadbed stability.
Background technology
The area that world's ever-frozen ground distributes accounts for 25% of global land surface, and China's ever-frozen ground area accounts for 22.4% of area.Cause under the double influence of permafrost degradation in global warming and mankind's activity, frozen soil melts or the back bearing capacity that heats up will reduce widely, have a strong impact on the stability of road foundation, this just brings great challenge for build and the maintenance of high temperature, high ice content Permafrost Area road.Therefore, resolve the frozen soil problem and become the key of guaranteeing that roadbed is stable for many years, ensure the road safety operation.
In order to resolve the frozen soil problem, guarantee the safety and stability of ever-frozen ground district road, people have proposed duct-ventilated embankment, promptly lay and connect, arrange perpendicular to the air chimney of road-trend in the position of roadbed levee body certain altitude, in order to increase the convection heat transfer intensity between roadbed and the atmosphere, utilize the air lower to flow than subgrade soil temperature, take away the heat of levee body, reduce roadbed temperature, reach the purpose of cooling ground.In order to protect frozen soil better; strengthen the cooling ability of duct-ventilated embankment; people have carried out improvement in various degree to it; for example saturating wall type duct-ventilated embankment, the temperature control duct-ventilated embankment etc. of laying the duct-ventilated embankment of heat insulating material and installing thermal insulation door additional, result of study shows that these improved duct-ventilated embankments can improve the cooling ability of duct-ventilated embankment to a certain extent.But these road structures all are to have utilized the external world that wind is arranged, and the enough big condition of wind-force, reach the purpose to the roadbed cooling; Then can not bring into play the characteristic that it cools when extraneous calm or roadbed is in the not smooth high temperature Permafrost Section of ventilation, guarantee under the condition of global warming that especially subgrade stability is suitable difficulty.
Summary of the invention
Under the overall background of global warming; for being implemented in the not enough or protection of not smooth location of ventilating of Qinghai-Tibet ever-frozen ground district (especially high temperature ever-frozen ground district) wind-force to ever-frozen ground under the roadbed; guarantee the stable of roadbed, the invention provides a kind of duct-ventilated embankment with chimney.It is according to the Qinghai-Tibet Platean climate characteristic that the four seasons temperature difference is big, temperature is lower than surface temperature usually, utilize stack effect, by chimney being installed at the air chimney middle part, accelerate the flowing velocity of air in the duct-ventilated embankment, realization is to the reduction of bottom frozen soils temperature, the lifting ever-frozen ground upper limit improves frozen earth roadbed stability for many years.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of duct-ventilated embankment with chimney, being equipped with the roadbed that fills densification on the natural surface of compacting bankets, roadbed bankets and inner is provided with the air chimney of level along road-trend, chimney is set on air chimney and runs through air chimney, and chimney is vertical and exceed the roadbed end face.
Above-mentioned air chimney diameter is 0.2～1.0m, and the tube and tube axis spacing is 2～3 times of calibers, and its axis is 0.5～4.0m apart from natural surface, and the chimney diameter is 0.2～1.0m, and chimney exceeds roadbed end face 0.2～1.5m, and the roadbed thickness that bankets is 1.0～8.0m.
The duct-ventilated embankment operating principle of this band chimney is a stack effect.Its course of work can be described as: in the external world under the calm or not smooth condition of ventilating, when winter outside air temperature lower, when soil body temperature is higher than the external world in the roadbed, upper temp occurs in the roadbed chimney and be lower than the bottom, atmospheric density is up big and down small, under the effect of gravity and buoyancy lift, the internal heat air is discharged from chimney, cool ambient air is from air chimney two side inflows, flowing of air brought outside " cold " in the roadbed into, simultaneously heats a large amount of in the roadbed is taken out of, realization is banketed to roadbed and the cooling effect of the natural soil layer in bottom; When summer ambient temperature higher, when soil body temperature was lower than the external world in the roadbed, chimney internal upper part temperature was higher than the bottom, atmospheric density is up-small and down-big, air is in relative static conditions, no convection current generation, air chimney is not worked.The present invention has utilized the operating principle of stack effect, effectively reduces its underpart frozen soils temperature, improves frozen soil upper limit, prevents the generation of frozen earth roadbed frost heave and thaw collapse.
For the stack effect of the duct-ventilated embankment of proof tape chimney, simulated experiment is to carry out in frozen soil engineering National Key Laboratory of Chinese Academy of Sciences cold area arid region environment and Engineering research institute.
The laboratory test result of study has shown that the duct-ventilated embankment of this band chimney has the good effect of cooling.Test is in special large insulation model casing (size: carry out in 8.0 * 1.84 * 2.7m.), environment temperature is controlled according to SIN function T=-4.0+12sin (2 π t/360+ pi/2) in the case, in the formula T be environment temperature (℃), t is time (h), the road bed temperature is than high about 5.5 ℃ of environment temperature in the case, separate with plank in roadbed the place ahead, allow wind to pass through from the roadbed top, wind speed is controlled at below the 0.5m/s.Test is divided into chimney and the two kinds of situations of band chimney be not with.Fig. 3 has shown not with the change curve in time of temperature between the air chimney of duct-ventilated embankment in the test model under chimney and two kinds of situations of band chimney.Curve A represents not to be with chimney situation, B to represent to be with the chimney situation among Fig. 3.As can be seen from Figure 3: under the test conditions that is equal to, temperature is starkly lower than temperature between the air chimney of the duct-ventilated embankment of not being with chimney between the air chimney of duct-ventilated embankment of band chimney.And, test period in the end, be not about 0 ℃ with minimum temperature between the air chimney of the duct-ventilated embankment of chimney, and minimum temperature reaches-1.4 ℃ between the air chimney of the duct-ventilated embankment of band chimney, the cycle average temperature is-0.4 ℃, than low 1.9 ℃ of road bed cycle average temperature (1.5 ℃), than low 2.1 ℃ of no chimney situation (1.7 ℃).
Above result of the test shows that the present invention has the good effect of cooling, the cooling-down effect of the duct-ventilated embankment of band chimney is not significantly better than with the duct-ventilated embankment of chimney, under calm or the not smooth condition of ventilating, improve the cooling-down effect of duct-ventilated embankment, guarantee frozen earth roadbed stablizing for many years.
The beneficial effect of advantage of the present invention and generation is:
1, the present invention is owing to installed chimney on the roadbed air chimney, made full use of stack effect, under calm or the not smooth condition of ventilating, can pass through stack effect in the winter time, to greatest extent heat in the roadbed is shed, summer the air in tube that ventilates be in relative static conditions, increased the thermal resistance of roadbed, played the intrusion that intercepts external heat, thereby, realization promotes frozen soil upper limit to the cooling effect of roadbed and bottom frozen soil, solves because frost heave that seasonal active layer produces in frozen-thaw process and thaw collapse are given the destruction that roadbed brought;
2, the present invention need not any external impetus facility, and is pollution-free, preserves the ecological environment.And, air chimney and chimney are made by concrete or PVC, can after finishing, factory process transport on-the-spot directly installation to, big artificial disturbance can be do not produced to frozen soil, calm or ventilate not smooth high temperature, the specific (special) requirements of high ice content Permafrost Area engineering stability that causes with a varied topography can be satisfied;
3, the present invention is simple in structure, and main material is concrete and reinforcing bar or PVC material, and cost is low, is easy to construction and safeguards that cooling-down effect and engineering stability are good, have application prospect preferably.
Description of drawings:
Fig. 1 is the duct-ventilated embankment horizontal section schematic diagram of band chimney.
Fig. 2 is the duct-ventilated embankment longitudinal profile schematic diagram of band chimney.
Fig. 3 is not for the change curve in time of temperature between the air chimney of duct-ventilated embankment in the test model under chimney and band chimney two kinds of situations.
The specific embodiment:
Below in conjunction with accompanying drawing, will be described further again the present invention.
With reference to accompanying drawing 1～2, a kind of duct-ventilated embankment with chimney, be equipped with the roadbed that fills densification and banket 3 on the natural surface 4 of compacting, roadbed 3 inside of banketing are provided with the air chimney 2 of level along road-trend, chimney 1 is set on air chimney 2 and runs through air chimney 2, air chimney 2 diameters are 1.0m, 2 times of calibers of tube and tube axis spacing, and its axis is 4.0m apart from natural surface 4, and chimney 1 diameter is 0.5m, chimney 1 is vertical and exceed roadbed end face 1.5m, and roadbed 3 thickness that banket are 4.0m.
When winter, outside air temperature was low, air themperature was higher than the external world in the roadbed air chimney, and hot air is discharged from chimney in the pipe, and cold air enters from the air chimney both sides, strengthens the overall thermal conductivity of roadbed, thereby had strengthened scattering and disappearing of roadbed self and its underpart soil layer heat; When summer, ambient temperature was higher, air themperature was lower than the external world in the roadbed air chimney, and air is in relative static conditions, no chimney effect.Therefore, realized that this band chimney breast ventilated embankment takes away heat, input cold in dead season, and, reached accumulation " cold ", protection frozen soil, improved the purpose of frozen earth roadbed stability in the work efficiency that the warm season heat should not be invaded.
Claims (2)
1, a kind of duct-ventilated embankment with chimney, it is characterized in that being equipped with on the natural surface (4) in compacting the roadbed that fills densification banket (3), roadbed (3) the inner air chimney (2) that is provided with level along road-trend that bankets, chimney (1) is set on air chimney (2) and runs through air chimney (2), chimney (1) is vertical and exceed the roadbed end face.
2, a kind of duct-ventilated embankment according to claim 1 with chimney, it is characterized in that air chimney (2) diameter is 0.2～1.0m, the tube and tube axis spacing is 2～3 times of calibers, and its axis is 0.5～4.0m apart from natural surface (4), chimney (1) diameter is 0.2～1.0m, chimney (1) exceeds roadbed end face 0.2～1.5m, and roadbed (3) thickness that bankets is 1.0～8.0m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810150063XA CN101289830A (en) | 2008-06-12 | 2008-06-12 | Duct-ventilated embankment with chimney |
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| CNA200810150063XA CN101289830A (en) | 2008-06-12 | 2008-06-12 | Duct-ventilated embankment with chimney |
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| CN101289830A true CN101289830A (en) | 2008-10-22 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213584A (en) * | 2013-06-05 | 2014-12-17 | 中国科学院寒区旱区环境与工程研究所 | Air door being automatically opened and closed |
| CN104264557A (en) * | 2014-08-28 | 2015-01-07 | 杭州江润科技有限公司 | Semi-filling and semi-excavating ecological subgrade structure and construction method |
| CN105926390A (en) * | 2016-04-27 | 2016-09-07 | 中国电力科学研究院 | Makeshift road roadbed and construction method thereof |
| CN107201702A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | Convection current regulates and controls the ventilated formula frozen soil ventilation embankment of full wall |
| CN108179669A (en) * | 2017-12-20 | 2018-06-19 | 张昆 | Frozen earth roadbed thermal protection struc ture body and its cooling means |
| CN110004911A (en) * | 2019-03-29 | 2019-07-12 | 中国科学院寒区旱区环境与工程研究所 | Protect the cold mattress system and its construction method of embedded object in a kind of Permafrost Area |
| CN110502772A (en) * | 2019-05-09 | 2019-11-26 | 中铁二院工程集团有限责任公司 | Slope permafrost region assembled self-ventilation road structure and design method |
| CN113756280A (en) * | 2021-10-13 | 2021-12-07 | 中国科学院西北生态环境资源研究院 | Ventilation cooling system for roadbed slope in snowy permafrost region and construction method thereof |
| CN113931092A (en) * | 2021-11-22 | 2022-01-14 | 王福州 | Anti-collapse road and construction method thereof |
-
2008
- 2008-06-12 CN CNA200810150063XA patent/CN101289830A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213584A (en) * | 2013-06-05 | 2014-12-17 | 中国科学院寒区旱区环境与工程研究所 | Air door being automatically opened and closed |
| CN104264557A (en) * | 2014-08-28 | 2015-01-07 | 杭州江润科技有限公司 | Semi-filling and semi-excavating ecological subgrade structure and construction method |
| CN107201702A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | Convection current regulates and controls the ventilated formula frozen soil ventilation embankment of full wall |
| CN105926390A (en) * | 2016-04-27 | 2016-09-07 | 中国电力科学研究院 | Makeshift road roadbed and construction method thereof |
| CN108179669A (en) * | 2017-12-20 | 2018-06-19 | 张昆 | Frozen earth roadbed thermal protection struc ture body and its cooling means |
| CN110004911A (en) * | 2019-03-29 | 2019-07-12 | 中国科学院寒区旱区环境与工程研究所 | Protect the cold mattress system and its construction method of embedded object in a kind of Permafrost Area |
| CN110004911B (en) * | 2019-03-29 | 2024-02-13 | 中国科学院西北生态环境资源研究院 | Cold pad system for protecting buried object in permafrost region and construction method thereof |
| CN110502772A (en) * | 2019-05-09 | 2019-11-26 | 中铁二院工程集团有限责任公司 | Slope permafrost region assembled self-ventilation road structure and design method |
| CN113756280A (en) * | 2021-10-13 | 2021-12-07 | 中国科学院西北生态环境资源研究院 | Ventilation cooling system for roadbed slope in snowy permafrost region and construction method thereof |
| CN113756280B (en) * | 2021-10-13 | 2023-08-11 | 中国科学院西北生态环境资源研究院 | Ventilation cooling system for roadbed slope in snowy permafrost region and construction method thereof |
| CN113931092A (en) * | 2021-11-22 | 2022-01-14 | 王福州 | Anti-collapse road and construction method thereof |
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