CN203212966U - Excavation subgrade of expressway in section with less/more ice - Google Patents
Excavation subgrade of expressway in section with less/more ice Download PDFInfo
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- CN203212966U CN203212966U CN2013201994782U CN201320199478U CN203212966U CN 203212966 U CN203212966 U CN 203212966U CN 2013201994782 U CN2013201994782 U CN 2013201994782U CN 201320199478 U CN201320199478 U CN 201320199478U CN 203212966 U CN203212966 U CN 203212966U
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- subgrade
- gravel bed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The utility model relates to an excavation subgrade of an expressway in a section with less/more ice. The excavation construction in a perennial frozen soil area can lead to temperature rise of the foundation soil mass, decrease of upper limit and impact on the stability of a subgrade. The excavation subgrade is characterized in that a waterproof geotextile is arranged at the base of a deep-excavation cut; a replacement gravel bed is arranged on the waterproof geotextile and provided with a side slope and a bottom cross slope; a pavement structural layer is arranged above the replacement gravel bed; the replacement gravel bed is 80cm in thickness; the slope is at a gradient of 1:0.5; the bottom cross slope is at the gradient of 2%. The subgrade structure provided by the utility model is low in construction cost, long in service life, and high in bearing capacity and waterproofness, and can be used for effectively solving the problems of temperature rise of the subgrade soil mass, decrease of upper limit and reduction of subgrade stability occurring in the deep-excavation cut construction process of the section with less/more ice in the perennial frozen soil area.
Description
Technical field
The utility model relates to a kind of road structure, is specifically related to a kind of few ice, ices highway section speedway excavation roadbed more.
Background technology
Ever-frozen ground district roadbed design should adopt the principle of " rather do not fill out and dig ", as far as possible based on filled-up ground, and the design principles of adopt protection frozen soil, initiatively lowering the temperature and allowing frozen soil to melt.Cutting is the roadbed of making by the excavation natural ground.The stratum that cutting passes through in long-term generation and evolution process, generally has complicated geologic structure.Cut slope is in veneer of crust, after excavation exposes, is subjected to the effect of various conditions and natural cause, deforms easily and destroys, and should treat cautiously.Particularly in the ever-frozen ground district, the excavation of natural surface can make ever-frozen ground be directly exposed in the atmosphere, causes the hot thaw collapse in summer to fall into, the hot slump that melts of side slope, winter the subgrade and pavement frost heave.When underground water exists, also can side slope hang diseases such as ice.
Several important highways that enter into Tibet such as existing Qinghai-Tibet Highway, blue or green Kanggong road, after all previous maintenance, reconstruction, reconstruction, at ever-frozen ground, particularly high ice content ever-frozen ground district all is to pass through with embankment basically.But, along with further going deep into of development of the West Regions, the further upgrading of country's road network, perfect, the area, Qinghai-Tibet Platean is because of demands such as national defense construction, economic development and tourism developments, need transform, upgrade original low-grade highway, in the build process of new highway, in some highway sections with a varied topography, particularly the cutting roadbed will inevitably appear deep-cutting in the bealock section of mountain ridge hilling terrain.
Carry out the excavation construction in Permafrost Area, the heat of bringing in the heat that the Excavating Construction of Roadbed process is brought into and the excavation face put procedure, the capital impacts ever-frozen ground under the roadbed, also may cause rainwater to enter the soil body under the roadbed in the construction, water and heat enter lower floor's soil body, will cause the acute variation of ever-frozen ground, cause the subgrade soil temperature to raise, the upper limit descends, and influences subgrade stability.The general requirement of the roadbed side slope of Permafrost Area slowed down side slope, and the side slope after slowing down just means bigger excavated section, the side slope behind the excavation inevitable some be on the ever-frozen ground layer, as deal with improperly with the heat that causes side slope melt, serious plant disease such as slump.Therefore, for ever-frozen ground district cutting roadbed, also there are not corresponding treatment measures.
Summary of the invention
The purpose of this utility model provides a kind of few ice, ices highway section speedway excavation roadbed more, overcomes the ever-frozen ground district and ices, ices more the highway section less and deep-cut the problem that the subgrade soil temperature raises, the upper limit descends, subgrade stability reduces that occurs in the construction of road cutting process.
The technical scheme that the utility model adopts is:
A kind of few ice, ice highway section speedway excavation roadbed more, it is characterized in that:
Deep-cut the cutting substrate water proof geotextiles is set, arrange on the water proof geotextiles and change the back-up sand gravel bed, change the back-up sand gravel bed side slope and bottom surface horizontal wall inscription are set, change back-up sand gravel bed top road surface structare layer is set.
The described thickness that changes the back-up sand gravel bed is 80cm, and grade of side slope is 1:0.5, and the bottom surface horizontal wall inscription gradient is 2%.
The described back-up sand gravel bed bottom surface horizontal wall inscription toe that changes is provided with gutter, and gutter is 25 pvc pipes with holes.
Deep-cut cutting above-ground route upward slope and be provided with the dash sth. made by twisting.
The gradient of the cut slope that road surface structare layer is above is 1:2-3.
The utlity model has following advantage:
The road structure that the utility model is related, construction cost is low, long service life, and bearing capacity is strong, good waterproof performance has solved the ever-frozen ground district effectively and has iced, ices more the highway section less and deep-cut the problem that the subgrade soil temperature raises, the upper limit descends, subgrade stability reduces that occurs in the construction of road cutting process.
Description of drawings
Fig. 1 is the utility model structure chart.
Among the figure, the 1-dash is twisted with the fingers, 2-water proof geotextiles, and 3-road surface structare layer, 4-change the back-up sand gravel bed, 5-gutter, 6-above-ground route.
The specific embodiment
Below in conjunction with the specific embodiment the utility model is described in detail.
A kind of few highway section speedway excavation roadbed of icing, ice more described in the utility model, water proof geotextiles 2 is set deep-cutting the cutting substrate, arrange on the water proof geotextiles 2 and change back-up sand gravel bed 4, change back-up sand gravel bed 4 side slope and bottom surface horizontal wall inscription are set, change back-up sand gravel bed 4 tops road surface structare layer 3 is set.Wherein, the thickness that changes back-up sand gravel bed 4 is 80cm, and grade of side slope is 1:0.5, and the bottom surface horizontal wall inscription gradient is 2%.Change back-up sand gravel bed 4 bottom surface horizontal wall inscription toes and be provided with gutter 5, gutter 5 is 25 pvc pipes with holes.Deep-cut cutting above-ground route upward slope and be provided with dash sth. made by twisting 1.
Concrete construction sequence is:
According to the roadbed design principle, backbreak under the road structure layer and change the back-up sand gravel behind the 80cm, grade of side slope excavates into 1:0.5 when changing the back-up sand gravel, cutting depth is 80cm under the road surface structare layer, the bottom surface becomes 2% horizontal wall inscription, its underpart arranges one deck water proof geotextiles, and toe arranges 25 pvc pipes with holes, and gutter and drainage system are along connecing.The back back-filling in layers of substrate excavation.During construction, excavate again when preliminary preparation is made adequate preparation to change and fill out operation, should in time construct behind the excavation, forbid airing, stop to excavate excavation hole, back ponding.When the excavation degree of depth during less than 4m, adopt 1:2～1:3 grade of side slope, when excavation height during greater than 4m, adopt the 1:2 grade of side slope.For big excavation construction of road cutting, should excavate operation in the winter time, want the thawing situation of close supervision excavation face frozen soil in the work progress, and take necessary cooling provision, prevent that the excavation face from melting.During the roadbed backfill accumulated snow can not be arranged, side slope will be carried out covered protection with former turf after construction was finished.
It is cited that content of the present utility model is not limited to embodiment, and the conversion of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model manual is claim of the present utility model and contains.
Claims (5)
- Few ice, ice highway section speedway excavation roadbed more, it is characterized in that:Deep-cut the cutting substrate water proof geotextiles (2) is set, water proof geotextiles (2) goes up to arrange changes back-up sand gravel bed (4), changes back-up sand gravel bed (4) side slope and bottom surface horizontal wall inscription are set, and changes back-up sand gravel bed (4) top road surface structare layer (3) is set.
- A kind of few ice according to claim 1, ice highway section speedway excavation roadbed more, it is characterized in that:The described thickness that changes back-up sand gravel bed (4) is 80cm, and grade of side slope is 1:0.5, and the bottom surface horizontal wall inscription gradient is 2%.
- A kind of few ice according to claim 1 and 2, ice highway section speedway excavation roadbed more, it is characterized in that:Described back-up sand gravel bed (4) the bottom surface horizontal wall inscription toe that changes is provided with gutter (5), and gutter (5) is 25 pvc pipes with holes.
- A kind of few ice according to claim 3, ice highway section speedway excavation roadbed more, it is characterized in that:Deep-cut cutting above-ground route upward slope and be provided with dash sth. made by twisting (1).
- A kind of few ice according to claim 4, ice highway section speedway excavation roadbed more, it is characterized in that:The gradient of the cut slope that road surface structare layer (3) is above is 1:2-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201994782U CN203212966U (en) | 2013-04-19 | 2013-04-19 | Excavation subgrade of expressway in section with less/more ice |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201994782U CN203212966U (en) | 2013-04-19 | 2013-04-19 | Excavation subgrade of expressway in section with less/more ice |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203212966U true CN203212966U (en) | 2013-09-25 |
Family
ID=49202515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201994782U Expired - Fee Related CN203212966U (en) | 2013-04-19 | 2013-04-19 | Excavation subgrade of expressway in section with less/more ice |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203212966U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468255A (en) * | 2018-03-21 | 2018-08-31 | 中铁二院(成都)建设发展有限责任公司 | The determination method of high-speed railway subgrade cutting location bedding replacement thickness |
| CN112160208A (en) * | 2020-08-13 | 2021-01-01 | 北京市政路桥股份有限公司 | Filling roadbed construction method suitable for water-rich low-lying permafrost region |
-
2013
- 2013-04-19 CN CN2013201994782U patent/CN203212966U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108468255A (en) * | 2018-03-21 | 2018-08-31 | 中铁二院(成都)建设发展有限责任公司 | The determination method of high-speed railway subgrade cutting location bedding replacement thickness |
| CN108468255B (en) * | 2018-03-21 | 2019-08-16 | 中铁二院(成都)建设发展有限责任公司 | The determination method of high-speed railway subgrade cutting location bedding replacement thickness |
| CN112160208A (en) * | 2020-08-13 | 2021-01-01 | 北京市政路桥股份有限公司 | Filling roadbed construction method suitable for water-rich low-lying permafrost region |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 |
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| CF01 | Termination of patent right due to non-payment of annual fee |