CN103696338A - Permafrost region road hollow-layer heat-preserving protection-foot composite roadbed - Google Patents
Permafrost region road hollow-layer heat-preserving protection-foot composite roadbed Download PDFInfo
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- CN103696338A CN103696338A CN201310657102.6A CN201310657102A CN103696338A CN 103696338 A CN103696338 A CN 103696338A CN 201310657102 A CN201310657102 A CN 201310657102A CN 103696338 A CN103696338 A CN 103696338A
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Abstract
The invention discloses a permafrost region road hollow-layer heat-preserving protection-foot composite roadbed. The permafrost region road hollow-layer heat-preserving protection-foot composite roadbed is characterized by comprising a rubble layer, an isolation layer, roadbed filled earth and a hollow layer, wherein the rubber layer with a given thickness is filled below the original ground to the height of the original ground, after geotechnical cloth and geogrid are sequentially paved on the rubble layer, the isolation layer with a given thickness is constructed, then the roadbed filled earth is paved on the isolation layer in a layering manner, then the hollow layer is paved on the roadbed filled earth, the geotechnical cloth is paved on the hollow layer, the roadbed filled earth is paved on the geotechnical cloth in a layering manner to the designed height of the roadbed, and finally two sides of the roadbed are respectively provided with the heat-preserving protection feet. The isolation layer is made of graded gravel or gravel soil. The roadbed filled earth is made of the natural gravel soil. The hollow layer is made of hollow plates or hollow bricks. The permafrost region road hollow-layer heat-preserving protection-foot composite roadbed has the advantages that the frozen earth below the permafrost region roadbed can be effectively protected, the upper limit of the permafrost can be improved, such quality harms of the road roadbed as fracturing and sinking can be prevented, simplicity in construction can be realized, and the construction cost is relatively low.
Description
Technical field
The present invention relates to highway subgrade resist technology, especially relate to a kind of permanent Permafrost area road voided layer insulation spats combined type roadbed.Being specially adapted to the poor location of geological conditions uses.
Background technology
Frozen soil is a kind of to the temperature variable soil medium of sensitivity and character very, contains abundant ground ice.Owing to banketing, excavating the factor impacts such as subgrade construction and highway operation stage vehicle pass-through and large cyclostrophic warm up, can be to existing permanent Temperature Field of Permafrost to change under roadbed, and generation body frost heaving and heat are melted, thereby cause the geological disasters such as crevice of roadbed, depression, and affect subgrade strength and stability.In order to reduce this situation, be the heat stability of maintenance of permanent Permafrost area road and the protection permanent frozen soil that underlies, wherein main existing resist technology is improved roadbed height, sheet or piece stone roadbed, isolation layer, hot pin, sunbreaker technology etc.
Improve roadbed height, can there is insulation effect to the roadbed permanent frozen soil that underlies.But main is to cause the obvious sunny and shady slope effect of roadbed both sides side slope, and then cause a series of elevated formation level diseases, there is revealing shoulder and cave in and longitudinal cracking in the domatic sunny side of highway subgrade, elevated formation level has also brought the thawing interlayer under roadbed to thicken simultaneously, subgrade settlement distortion increases, for roadbed unstable brings huge hidden danger.Also increased construction costs simultaneously.
Sheet or piece stone roadbed are to utilize the natural convection air in the space between sheet or stone to reach aeration-cooling effect.But particle diameter be there are certain requirements, and when porosity can not meet the demands, aeration-cooling effect is just poor, and porosity is wayward, sheet or stone layer roadbed side slope, easily by fillings such as sand soil, are that its cross ventilation effect reduces greatly simultaneously, even do not have, thereby reduced aeration-cooling effect.
Isolation layer is to utilize industrial heat-barrier material, increases roadbed thermal resistance, minimizing atmosphere or solar heat and imports roadbed into.But at cold season, isolation layer is unfavorable for that roadbed body and external heat exchange, be unfavorable for that isolation layer lower floor soil body cold season absorbs extraneous cold and reduces, in permafrost region long-play use meeting, in roadbed, form thermal accumlation, cause permanent frozen soil upper limit to decline.And heat-barrier material technology is also inapplicable in High Temperature Permafrost district.
Hot pin technology exists caloic leakage problem in addition, once reveal, cannot re-use, and roadbed will have certain altitude, and its engineering measure cost is high, easily by rainwater and soil corrosion.Although the cooling of sunbreaker technology significantly, is a kind of technical measures that can effectively reduce permafrost temperature under roadbed, this technical measures cost is huge, cannot carry out slope vegetation, is difficult for environmental protection.
Summary of the invention
Object of the present invention is exactly the defect existing for prior art; a kind of permanent Permafrost area road voided layer insulation spats combined type roadbed is provided; effectively protect frozen soil under the roadbed of permanent Permafrost area road; protection surrounding environment; improve permanent frozen soil upper limit; prevent the quality diseases such as highway subgrade cracking, depression, easy construction, reduces construction costs.
Action principle of the present invention is: cold season cold air owing to thering is greater density, under deadweight and wind action, utilize voided layer hole to carry out cross-ventilation, hot air in hole is extruded, and constantly roadbed surrounding soil heat is taken away to reach and protected foundation soil frozen state; At warm season, because one deck voided layer exists, can effectively cut off roadbed inner upper heat going down; And in conjunction with the heat preservation property of berm insulation layer, effectively controlled the caloric receptivity of warm season, and significantly improved the clean thermal discharge of roadbed in a freezing and thawing cycle, the highway subgrade soil body that underlies is had to equilibrium temperature effect; Earth's surface following certain depth frozen soil active layer is changed to fill block rubble or gravel simultaneously, promote frozen soil upper limit, increase roadbed base intensity; Therefore meet the specific (special) requirements of permanent Permafrost area road subgrade strength and degree stability.Thereby can effectively protect frozen soil under the roadbed of permanent Permafrost area road, improve permanent frozen soil upper limit, prevent the quality diseases such as highway subgrade cracking, depression.
The object of the present invention is achieved like this: a kind of permanent Permafrost area road voided layer insulation spats combined type roadbed, it is characterized in that: comprise rubble layer, separation layer, Roadbed Soil, voided layer, below original ground, change and fill out certain thickness rubble layer to original ground height, on rubble layer, lay successively geotextiles, after geo-grid, making certain thickness separation layer, then on separation layer, place Min layers is built Roadbed Soil, on Roadbed Soil, lay again one deck voided layer, on voided layer, re-lay one deck geotextiles, in geotextiles, place Min layers is built Roadbed Soil to roadbed design height again, finally in roadbed both sides, insulation spats is set.
Described separation layer is graded broken stone or gravel soil.
Described Roadbed Soil is natural gravel soil.
Described voided layer is hollowcore slab or hollow brick.
Compared with prior art, advantage of the present invention is: can effectively protect frozen soil under the roadbed of permanent Permafrost area road, protection surrounding environment, improves permanent frozen soil upper limit, prevents the quality diseases such as highway subgrade cracking, depression, easy construction, and construction costs is lower.
Accompanying drawing explanation
Fig. 1: permanent Permafrost area road hollowcore slab insulation spats combined type road structure schematic diagram.
In figure: 1, rubble 2, geotextiles 3, geo-grid 4, graded gravel soil 5, natural gravel soil 6, hollowcore slab 7, insulation spats 8, original ground 9, frozen soil covering layer 10, permanent frozen soil.
The specific embodiment
For further describing the present invention, below in conjunction with embodiment and accompanying drawing, the invention will be further described.
Embodiment 1: as shown in the figure, the construction sequence of a kind of permanent Permafrost area road voided layer insulation spats combined type roadbed is as follows: one, with excavator, excavate the more than 10 frozen soil covering layer 9 at original ground permanent frozen soil below 8, then change and fill out 1 layer, the thick rubble of impact-rolling 1.0 ~ 2.0m, width is not less than 2.0m than roadbed bottom width, and end face is used compared with small crushed stone and flattened; Rubble 1 adopts not weathering solid rock, and intensity is not less than 30MPa, and shape is roughly upright, and minor face size should not be less than 15cm.Two, at 1 layer of end face of rubble, lay successively geotextiles 2, geo-grid 3.Geotextiles 2 quality ≮ 300g/m
2, effective aperture <0.12mm, CBR bursting strength >2.6KN; Geo-grid 3 adopts simple tension geo-grid, its tensile strength>=60KN/m, and limit elongation≤20%, fabric width is greater than 2m, and lap width is not less than 20cm, and lap-joint adopts the less nylon rope of elongation per unit length to be the connection of " it " word.Three, making graded gravel soil 4 separation layers in geotextiles 2 and geo-grid 3, then flatten compacting, and the particle diameter of graded gravel soil 4 is 0.5 ~ 4cm, and mud content is not more than 5%, is bulldozed heavy vibration roller compacting with bulldozer or land leveller.Four, at graded gravel soil 4 separation layer higher slice makings, natural gravel soil 5 Roadbed Soils of compacting, natural gravel soil 5 mud contents are no more than 15%, optimum moisture content is no more than 8%, maximum particle diameter is no more than 5cm, layering making loose laying depth is not more than 30cm, this layer height is no more than 1.0cm, and side slope is 1:1.5 ~ 3.Adopt bulldozer or land leveller to be bulldozed, heavy vibration roller compacting, basic horizontal after this layer completion.Five, on natural gravel soil 5 Roadbed Soils, be horizontally disposed with one deck hollowcore slab 6, hollowcore slab 6 is the prefabricated three many hollow plates in hole of cement concrete, and the thickness of plate is 20cm, and long * wide is 0.5m * 1.0m, aperture Φ 10cm, and, strength grade is not less than C20; During placement, to guarantee the vertical road-trend of hollowcore slab 6 hole direction, and interconnect.Six, after hollowcore slab 6 has been constructed, lay one deck geotextiles 2 in the above, to prevent that top from banketing, enter hollowcore slab 6.Seven, layering making, natural gravel soil 5 Roadbed Soils of compacting on geotextiles 2 again, layering making loose laying depth is not more than 30cm, adopts bulldozer or land leveller to be bulldozed, heavy vibration roller compacting; When first floor bankets, be necessary for 50cm thick, adopt bulldozer or land leveller to be bulldozed, adopt quiet road roller compacting filling soil.This layer height is no more than 1.0 ~ 1.5cm, and side slope is 1:1.5 ~ 3.Eight, construction heat-insulating spats 7 after each layer of completion of roadbed, side slope outside the backfill of roadbed both sides use excavator, its material is the frozen soil of the earth's surface original ground the excavated frozen soil covering layer 9 below 8, insulation spats 7 upper width are 2.0 ~ 3.0m, highly be no more than 0.8 ~ 1.0cm, side slope is 1:1.5 ~ 3, horizontal wall inscription ≮ 4.
Embodiment 2: the construction sequence of a kind of permanent Permafrost area road voided layer insulation spats combined type roadbed is as follows: step 1, two, three, four, six, seven, eight identical with embodiment 1, step 5 changes into: one deck hollow brick is set on banketing natural gravel is earth roadbed, hollow brick is how empty brick, material can be shale, sintering, clay, hollow brick height is 25cm, hole ratio is greater than 30%, and strength grade is not less than 20; During construction, to guarantee the vertical road-trend of hollow brick hole direction, and interconnect.All the other are identical with embodiment 1.
Claims (4)
1. a permanent Permafrost area road voided layer is incubated spats combined type roadbed, it is characterized in that: comprise rubble layer, separation layer, Roadbed Soil, voided layer, below original ground, change and fill out certain thickness rubble layer to original ground height, on rubble layer, lay successively geotextiles, after geo-grid, making certain thickness separation layer, then on separation layer, place Min layers is built Roadbed Soil, on Roadbed Soil, lay again one deck voided layer, on voided layer, re-lay one deck geotextiles, in geotextiles, place Min layers is built Roadbed Soil to roadbed design height again, finally in roadbed both sides, insulation spats is set.
2. a kind of permanent Permafrost area road according to claim 1 voided layer insulation spats combined type roadbed, is characterized in that: described separation layer is graded broken stone or gravel soil.
3. a kind of permanent Permafrost area road according to claim 1 voided layer insulation spats combined type roadbed, is characterized in that: described Roadbed Soil is natural gravel soil.
4. a kind of permanent Permafrost area road according to claim 1 voided layer insulation spats combined type roadbed, is characterized in that: described voided layer is hollowcore slab or hollow brick.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966934A (en) * | 2014-04-30 | 2014-08-06 | 长沙理工大学 | Method for improving frozen stability of highway subgrade in seasonal frozen region |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1730822A (en) * | 2005-08-23 | 2006-02-08 | 中国科学院寒区旱区环境与工程研究所 | Composite ventilating and cold energy gathering roadbed |
| CN201195817Y (en) * | 2008-05-29 | 2009-02-18 | 中国科学院寒区旱区环境与工程研究所 | Convection current-ventilation combined subgrade |
| RU2379405C1 (en) * | 2008-11-07 | 2010-01-20 | Государственное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" | Embankment on frozen soil |
| CN102628247A (en) * | 2012-04-24 | 2012-08-08 | 天津二十冶建设有限公司 | Insulation construction method for frozen-earth roadbed |
-
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- 2013-12-09 CN CN201310657102.6A patent/CN103696338A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1730822A (en) * | 2005-08-23 | 2006-02-08 | 中国科学院寒区旱区环境与工程研究所 | Composite ventilating and cold energy gathering roadbed |
| CN201195817Y (en) * | 2008-05-29 | 2009-02-18 | 中国科学院寒区旱区环境与工程研究所 | Convection current-ventilation combined subgrade |
| RU2379405C1 (en) * | 2008-11-07 | 2010-01-20 | Государственное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" | Embankment on frozen soil |
| CN102628247A (en) * | 2012-04-24 | 2012-08-08 | 天津二十冶建设有限公司 | Insulation construction method for frozen-earth roadbed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966934A (en) * | 2014-04-30 | 2014-08-06 | 长沙理工大学 | Method for improving frozen stability of highway subgrade in seasonal frozen region |
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Application publication date: 20140402 |