CN2835328Y - Frozen soil subgrade comprising ventilation concrete slab and block crushed stone - Google Patents
Frozen soil subgrade comprising ventilation concrete slab and block crushed stone Download PDFInfo
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- CN2835328Y CN2835328Y CN 200520079311 CN200520079311U CN2835328Y CN 2835328 Y CN2835328 Y CN 2835328Y CN 200520079311 CN200520079311 CN 200520079311 CN 200520079311 U CN200520079311 U CN 200520079311U CN 2835328 Y CN2835328 Y CN 2835328Y
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Abstract
The utility model relates to a coldness gathering subgrade comprising a ventilating concrete slab and block crushed stones. The structure of the utility model is characterized in that a compactly pressed earth surface is provided with a filled and compactly pressed gravel stone laid layer. The upper part of the gravel stone laid layer is additionally provided with a communicated horizontal block crushed stone layer. The upper part of the horizontal block crushed stone layer is laid with the concrete slab with longitudinally communicated ventilating holes. The ventilating holes are vertical to the stretching direction of the subgrade. The upper part of the concrete slab is provided with compactly pressed subgrade filled earth. The utility model combines the block crushed stone layer and the ventilating concrete slab and sufficiently uses the function that the ventilating holes can carry out quick heat exchange with air in outer sphere and the effect of the natural convection and the temperature reduction of the block crushed stone layer. In winter, the coldness gathering subgrade can disperse heat to the greatest extent and in summer, the coldness gathering subgrade can prevent the heat from transferring into the subgrade to realize the temperature reducing function on the frozen earth at the lower part of the subgrade and raise the upper limit of the frozen earth. The coldness gathering subgrade solves the problem of the damage of the subgrade caused by frozen swelling and melting weight which are generated in the melting process of seasonal active layers to guarantee the years' stabilization of the frozen earth subgrade.
Description
Technical field
The utility model relates to a kind of structure of road, and especially a kind of ventilation concrete slab and pipe-massive stone layer are cold energy gathering roadbed.It can reduce roadbed bottom frozen soils temperature effectively, and the lifting frozen soil upper limit improves frozen earth roadbed stability.
Background technology
The Qinghai-Tibet Platean permafrost region, because unfreezing has repeatedly produced many special natural geological phenomenons in the ever-frozen ground district, as frost heave, thaw collapse, lifting by frost, freeze thawing sorting etc., they produce influence greatly to engineering.Statistical research shows, the main engineering disease in ever-frozen ground district is from thaw collapse and frost heave.At present, the Qinghai-Tibet Railway of building (Golmud to Lhasa section) is the plateau railway that height above sea level is the highest in the world, mileage is the longest, passes through the ever-frozen ground district and is about 632 kilometers, and wherein the high temperature permafrost region is 76%, and the hight-ice-content permafrost district is 59%.Because the existence of a large amount of thick-layer ground ices has determined its special and complex engineering characteristic in the frozen soil.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 high temperature, building with maintenance of road of hight-ice-content permafrost area.Therefore, resolve the frozen soil problem and become the key of guaranteeing that roadbed is stable for many years, guarantee the road safety operation.
In order to resolve the frozen soil problem, U.S. scientist Douglas J.Goering (Goering D J.Passively Cooled Railway Embankments for Use in Permafrost Areas[J] .Journalof Cold Regions Engineering, 2003,17 (3): 119-133) proposed a kind of road structure form of amassing with piece (broken) clitter fully.This measure has utilized the cooling effect of natural convection of porous media that its underpart soil body is lowered the temperature, but because loose piece rubble body globality is very poor, mechanical stability is difficult to guarantee, easy deformation under external force effects such as locomotive, even cave in.China has taked a kind of road structure form of dosing the certain thickness soil layer at the pipe-massive stone layer top in Qinghai-Tibet Railway construction, this form of structure can be guaranteed the monolithic stability of roadbed, but because the influence of embankment upper soil horizon has not only reduced the contact area of pipe-massive stone layer and air, and caused the pipe-massive stone layer top and the bottom temperature difference to diminish, thereby cause the interior natural convection effect of pipe-massive stone layer to die down, even disappear, can not effectively extraneous cold energy be passed in the frozen soil of embankment bottom.Therefore, want to utilize separately existing these technology to realize protection, guarantee that subgrade stability is suitable difficulty bottom frozen soil at the high temperature permafrost region.
Summary of the invention
Under the overall background of global warming, for being implemented in the protection of Qinghai-Tibet ever-frozen ground (especially high temperature ever-frozen ground) district, guarantee the stable of roadbed to ever-frozen ground under the embankment, the utility model provides a kind of ventilation concrete slab and pipe-massive stone layer cold energy gathering roadbed.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 the cooling effect of natural convection of porous media, reduce the upper surface temperature of pipe-massive stone layer by the gravity vent in the concrete slab, increase the pipe-massive stone layer top end temperature difference, strengthen cooling effect of natural convection, realization is to the reduction of bottom frozen soils temperature, and the lifting ever-frozen ground upper limit improves frozen earth roadbed stability for many years.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of ventilation concrete slab and pipe-massive stone layer are cold energy gathering roadbed, be on the natural surface of compacting, to be equipped with the sand-gravel cushion that fills densification, the horizontal block macadam of perforation is dosed on sand-gravel cushion top, lay the concrete slab of the gravity vent that has vertical perforation on the top of horizontal block macadam, gravity vent is perpendicular to road-trend; The embankment filled soil of densification compacting is arranged at concrete slab top.
Horizontal block macadam thickness is 1.0～3.0m, and the piece ballast grain sizes is 10～30cm, sand-gravel cushion thickness≤0.5m.
Concrete slab is formed by concrete and reinforcing bar mold.The gravity vent shape can be circle or semicircle or square or triangle.
This ventilation concrete slab and the cold energy gathering roadbed operating principle of pipe-massive stone layer are the cooling effect of natural convection of porous media.Its course of work can be described as: when winter, outside air temperature was low, realize that by the gravity vent of concrete slab embankment inside and extraneous low-temperature airflow carry out interchange of heat, thereby reduce pipe-massive stone layer upper surface temperature, increase pipe-massive stone layer top and bottom surface temperature difference, occur upper temp in the pipe-massive stone layer and be lower than the bottom, atmospheric density is up big and down small, under the effect of gravity and buoyancy lift, inside has natural convection air to take place, flowing of air brought outside cold in the roadbed into, the come-up of the light air in bottom flows and also can take heats a large amount of in the roadbed out of simultaneously, realizes the cooling effect to the natural soil layer of embankment filled soil and bottom; When summer, ambient temperature was higher, though the gravity vent of concrete slab can cause the rising of pipe-massive stone layer upper surface temperature equally, this moment, pipe-massive stone layer internal upper part temperature was higher than the bottom, and atmospheric density is up-small and down-big, and air is in relative static conditions, and no convection current takes place.Because the coefficient of thermal conductivity of air is very little, thereby can intercept heat from the pipe-massive stone layer top.The utility model has utilized gravity vent to come the cooling effect of natural convection of boss macadam, effectively reduces its underpart frozen soils temperature, improves frozen soil upper limit, prevents the generation of frozen earth roadbed frost heave and thaw collapse.
The laboratory test result of study has shown that this ventilation concrete slab and pipe-massive stone layer are cold energy gathering roadbed and has had an effect of cooling preferably.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=1.0+12sin (2 π t/360+ pi/2) in the case, in the formula T be environment temperature (℃), t is time (h), wind speed is 2.5m/s.Test is divided into no concrete slab and two kinds of situations of ventilation concrete slab is arranged.Fig. 3 has shown no concrete slab and pipe-massive stone layer bottom temp graph in the test model has been arranged under two kinds of situations of ventilation concrete slab.Curve A represents that environment temperature control curve, B represent not have the concrete slab situation, C represents to have ventilation concrete slab situation among Fig. 3.As can be seen from Figure 3: under the test conditions that is equal to, have the pipe-massive stone layer bottom temp of ventilation concrete slab to be starkly lower than the pipe-massive stone layer bottom temp of no concrete slab.And, in the end a test period, there is the pipe-massive stone layer bottom maximum temperature of ventilation concrete slab to be lower than 0 ℃, average temperature is-1.7 ℃, than low 2.7 ℃ of environment average temperature (1.0 ℃), than low 1.6 ℃ of no concrete slab situation (0.1 ℃).
Above laboratory test result of study shows: the utlity model has the good effect of cooling, its underpart frozen soils temperature is reduced, make it be in the higher stable state, guarantee frozen earth roadbed stablizing for many years.
The beneficial effect of advantage of the present utility model and generation is:
1, the utility model is because the existence of pipe-massive stone layer top portion ventilation concrete slab, made full use of the cooling effect of natural convection of porous media, can to greatest extent heat be shed in the winter time, summer, but trap heat was transmitted in roadbed again, realization is to the cooling effect of roadbed bottom frozen soil, make it be in lower state of temperature, promote frozen soil upper limit, solve because frost heave that seasonal active layer produces in frozen-thaw process and thaw collapse are given the destruction that roadbed brought;
2, the utility model need not any external impetus facility, and is pollution-free, preserves the ecological environment.And the piece rubble is drawn materials conveniently, and concrete slab can transport on-the-spot directly laying to after factory process is finished, can not produce big artificial disturbance to frozen soil, can satisfy the specific (special) requirements of high temperature, hight-ice-content permafrost area engineering stability;
3, the utility model is simple in structure, and main material is piece rubble and concrete, and cost is low, is easy to construction and safeguards that cooling-down effect and engineering stability are good, have application prospect preferably.Especially in the ever-frozen ground district of high temperature, high ice content, its same stable and safety that can guarantee road with viaduct, but its cost only is 40～50% of a viaduct.
Description of drawings:
Fig. 1 is the utility model horizontal section schematic diagram
Fig. 2 is the utility model longitudinal profile schematic diagram
Fig. 3 for no concrete slab with pipe-massive stone layer bottom temp graph in the test model is arranged under two kinds of situations of ventilation concrete slab
The specific embodiment:
Below in conjunction with accompanying drawing, will be described further again the utility model.
With reference to accompanying drawing 1～2, a kind of ventilation concrete slab and pipe-massive stone layer of natural cold energy of utilizing is cold energy gathering roadbed, at first with natural surface 6 compactings, and filling-up thickness 0.3m sand-gravel cushion 4 then, densification; The horizontal block macadam 3 of perforation is dosed on sand-gravel cushion 4 tops, thickness is 1.5m, the piece ballast grain sizes is 10～30cm, the top is with the less rubble levelling of particle diameter, lay the concrete slab 1 of the gravity vent 2 that band vertically connects then on horizontal block macadam 3 tops, seam grouting between plate increases the globality of concrete slab 1 and prevents the top leakage of banketing down, dose embankment filled soil 5 again on concrete slab 1 top, and the densification compacting.
When winter, outside air temperature was low, realize that by the gravity vent 2 of concrete slab 1 embankment inside and extraneous low-temperature airflow carry out interchange of heat, reduce pipe-massive stone layer 3 upper surface temperature, increase pipe-massive stone layer 3 tops and the lower surface temperature difference (upper temp is lower than the bottom), strengthen its inner air natural convection intensity, strengthen the overall thermal conductivity of roadbed, thereby strengthened scattering and disappearing of embankment self and its underpart soil layer heat; When summer, ambient temperature was higher, pipe-massive stone layer 3 internal upper part temperature were higher than the bottom, and air is in relative static conditions, and no convection current takes place.In addition, because the coefficient of thermal conductivity of air is very little, thereby can intercept heat from the pipe-massive stone layer top.Therefore, realized that this ventilation concrete slab and pipe-massive stone layer are cold energy gathering roadbed to take away heat, input cold, and in the work efficiency that the warm season trap heat is invaded, reached the accumulation cold, the purpose of protection frozen soil in dead season.
Claims (4)
1, a kind of ventilation concrete slab and pipe-massive stone layer are cold energy gathering roadbed, it is characterized in that being equipped with on the natural surface (6) in compacting the sand-gravel cushion (4) that fills densification, the horizontal block macadam (3) of perforation is dosed on sand-gravel cushion (4) top, lay the concrete slab (1) of the gravity vent (2) that has vertical perforation on the top of horizontal block macadam (3), gravity vent (2) is perpendicular to road-trend; The embankment filled soil (5) of densification compacting is arranged at concrete slab (1) top.
2, a kind of ventilation concrete slab according to claim 1 and pipe-massive stone layer are cold energy gathering roadbed, it is characterized in that horizontal block macadam (3) thickness is 1.0～3.0m, and the piece ballast grain sizes is 10～30cm, sand-gravel cushion (4) thickness≤0.5m.
3, a kind of ventilation concrete slab according to claim 1 and pipe-massive stone layer are cold energy gathering roadbed, it is characterized in that gravity vent (2) shape can be circle or semicircle or square or triangle.
4, a kind of ventilation concrete slab according to claim 1 and pipe-massive stone layer are cold energy gathering roadbed, it is characterized in that concrete slab (1) is to be formed by concrete and reinforcing bar mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520079311 CN2835328Y (en) | 2005-08-23 | 2005-08-23 | Frozen soil subgrade comprising ventilation concrete slab and block crushed stone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520079311 CN2835328Y (en) | 2005-08-23 | 2005-08-23 | Frozen soil subgrade comprising ventilation concrete slab and block crushed stone |
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| CN2835328Y true CN2835328Y (en) | 2006-11-08 |
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| CN 200520079311 Expired - Lifetime CN2835328Y (en) | 2005-08-23 | 2005-08-23 | Frozen soil subgrade comprising ventilation concrete slab and block crushed stone |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357521C (en) * | 2005-08-23 | 2007-12-26 | 中国科学院寒区旱区环境与工程研究所 | Composite ventilating and cold energy gathering roadbed |
| CN101956356A (en) * | 2010-09-01 | 2011-01-26 | 中国科学院寒区旱区环境与工程研究所 | Novel subgrade structure for preventing road frost boiling in cold area |
| CN102605699A (en) * | 2012-03-23 | 2012-07-25 | 河海大学 | Technology for settlement control of hollow rigid plate after construction of deep soft soil foundation of high-level embankment |
| CN103485354A (en) * | 2013-10-17 | 2014-01-01 | 兰州理工大学 | Frame-aeration cooling anchor pipe structure for keeping frozen soil slope stable and construction method |
| CN104452508A (en) * | 2014-12-12 | 2015-03-25 | 中交第一公路勘察设计研究院有限公司 | Large-scale frozen roadbed cooling structure capable of strengthening convective cooling efficiency of rock blocks |
| CN107201701A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | The complete ventilated formula frozen soil ventilation embankment of wall |
| CN108179669A (en) * | 2017-12-20 | 2018-06-19 | 张昆 | Frozen earth roadbed thermal protection struc ture body and its cooling means |
| CN112376345A (en) * | 2020-10-29 | 2021-02-19 | 东南大学 | Continuous reinforced concrete hollow slab concrete pavement composite structure for permafrost region and construction method |
-
2005
- 2005-08-23 CN CN 200520079311 patent/CN2835328Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357521C (en) * | 2005-08-23 | 2007-12-26 | 中国科学院寒区旱区环境与工程研究所 | Composite ventilating and cold energy gathering roadbed |
| CN101956356A (en) * | 2010-09-01 | 2011-01-26 | 中国科学院寒区旱区环境与工程研究所 | Novel subgrade structure for preventing road frost boiling in cold area |
| CN101956356B (en) * | 2010-09-01 | 2012-05-23 | 中国科学院寒区旱区环境与工程研究所 | Novel subgrade structure for preventing road frost boiling in cold area |
| CN102605699A (en) * | 2012-03-23 | 2012-07-25 | 河海大学 | Technology for settlement control of hollow rigid plate after construction of deep soft soil foundation of high-level embankment |
| CN103485354A (en) * | 2013-10-17 | 2014-01-01 | 兰州理工大学 | Frame-aeration cooling anchor pipe structure for keeping frozen soil slope stable and construction method |
| CN104452508A (en) * | 2014-12-12 | 2015-03-25 | 中交第一公路勘察设计研究院有限公司 | Large-scale frozen roadbed cooling structure capable of strengthening convective cooling efficiency of rock blocks |
| CN107201701A (en) * | 2016-03-17 | 2017-09-26 | 中国科学院寒区旱区环境与工程研究所 | The complete ventilated formula frozen soil ventilation embankment of wall |
| CN108179669A (en) * | 2017-12-20 | 2018-06-19 | 张昆 | Frozen earth roadbed thermal protection struc ture body and its cooling means |
| CN112376345A (en) * | 2020-10-29 | 2021-02-19 | 东南大学 | Continuous reinforced concrete hollow slab concrete pavement composite structure for permafrost region and construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20071226 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20071226 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |