CN210238158U - Plateau high-ice-content frozen soil section railway cutting structure - Google Patents
Plateau high-ice-content frozen soil section railway cutting structure Download PDFInfo
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- CN210238158U CN210238158U CN201920877290.6U CN201920877290U CN210238158U CN 210238158 U CN210238158 U CN 210238158U CN 201920877290 U CN201920877290 U CN 201920877290U CN 210238158 U CN210238158 U CN 210238158U
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Abstract
The utility model relates to a railway cutting structure of frozen soil section with high ice content in plateau, which overedges and fills coarse-grained soil on the side slopes on both sides and the slope bottom of the cutting to form a coarse-grained soil filling layer, which comprises the side slope parts on both sides and the pavement part on the central plane; vertical heat pipes inserted into frozen soil are arranged on two sides of the pavement part, and side ditches are arranged on the surface of the coarse-grained soil replacement layer on the inner side of each heat pipe. The utility model discloses from the needs of protection frozen soil environment, maintenance ecological balance and cutting self stability, carried out new design to the cutting of high ice content frozen soil section for cutting frozen soil environment can in time obtain protecting and recovering, and construction cycle is short, and is efficient, easily promotes.
Description
Technical Field
The utility model relates to a cutting structure, concretely relates to plateau height contains frozen soil district railway cutting structure of ice content.
Background
The soil body containing ice is the fundamental place of permafrost which is different from other rock-soil. Receive permafrost engineering geological feature's influence, plateau high ice content frozen soil section excavation cutting will produce very adverse effect to the foundation side slope soil body temperature field, and the engineering nature of the permafrost of lying down will take place to show and change, promptly: the buried depth of the frozen soil becomes shallow or the frozen soil is completely exposed in the atmosphere, the frozen soil begins to melt, the soil body is saturated with water, the strength is rapidly reduced, and the slope is cracked, glides and slips due to improper treatment.
Moreover, highland high contains that the ice volume frozen soil section cutting work procedure is various, and the technology is complicated, need through blasting excavation, heat preservation maintenance, trade fill, manger plate low bank between fields construction etc. time span is big, cutting frozen soil environment can not in time obtain protection and recovery to very easily destroy cutting frozen soil environment, influence cutting construction quality.
Disclosure of Invention
The utility model aims at providing a plateau height contains ice content frozen soil district railway cutting structure satisfies plateau height and contains ice content frozen soil district user demand.
The utility model discloses the technical scheme who adopts does:
the utility model provides a plateau height contains frozen soil section railway cutting structure of ice content which characterized in that:
performing overbreak replacement and filling of coarse-grained soil on side slopes and slope bottoms on two sides of the cutting to form a coarse-grained soil replacement and filling layer which comprises side slope parts on two sides and a pavement part on a central plane;
vertical heat pipes inserted into frozen soil are arranged on two sides of the pavement part, and side ditches are arranged on the surface of the coarse-grained soil replacement layer on the inner side of each heat pipe.
Slopes on two sides of the cutting below the coarse-grained soil replacement and filling layer are in a step shape.
And the slope tops of the side slopes on two sides of the coarse-grained soil replacement and filling layer are provided with water retaining banks.
And water-proof materials are arranged from the tops of the side slopes on the two sides of the coarse-grained soil replacement and filling layer to the position below the natural upper limit of the frozen soil, extend upwards to the coarse-grained soil replacement and filling layer from the position below the natural upper limit of the frozen soil, and extend inwards to the side slopes on the two sides of the coarse-grained soil replacement and filling layer.
And a water-resisting material and a heat-insulating material are arranged in the road surface part of the coarse-grained soil backfill layer.
The coarse-grained soil replacement and filling layers of the slopes on the two sides of the cutting are of a layered structure along with the steps, and geogrids are laid between the layers.
U-shaped precast concrete members are laid in the side ditches and longitudinally assembled and fully paved on the side ditches.
The utility model has the advantages of it is following:
the utility model discloses from the needs of protection frozen soil environment, maintenance ecological balance and cutting self stability, carried out new design to the cutting of high ice content frozen soil section for cutting frozen soil environment can in time obtain protecting and recovering, and construction cycle is short, and is efficient, easily promotes.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
In the figure, 1-water-resisting material, 2-natural upper limit of frozen soil, 3-geogrid, 4-heat pipe, 5-heat-insulating material, 6-high ice content frozen soil and 7-coarse granular soil are replaced and filled.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a railway cutting structure of frozen soil section with high ice content in plateau, which overedges and fills coarse-grained soil on the side slopes on both sides and the slope bottom of the cutting to form a coarse-grained soil filling layer, which comprises the side slope parts on both sides and the pavement part on the central plane; vertical heat pipes 4 inserted into frozen soil are arranged on two sides of the pavement part, side ditches are arranged on the surface of the coarse-grained soil replacement layer on the inner sides of the heat pipes 4, U-shaped precast concrete members are paved in the side ditches, and the side ditches are longitudinally assembled and paved. And the slope tops of the side slopes on two sides of the coarse-grained soil replacement and filling layer are provided with water retaining banks.
Slopes on two sides of the cutting below the coarse-grained soil replacement and filling layer are in a step shape. The coarse-grained soil replacement and filling layers of the slopes on the two sides of the cutting are of a layered structure along with the steps, and geogrids 3 are laid between the layers.
And a waterproof material (SBS) 1 is arranged from the top of the slope on the two sides of the coarse-grained soil backfill layer to the position below the natural upper limit 2 of the frozen soil, extends upwards to the coarse-grained soil backfill layer from the position below the natural upper limit 2 of the frozen soil and then extends inwards to the slopes on the two sides of the coarse-grained soil backfill layer. A water-proof material 1 and a heat-insulating material 5 are arranged in the road surface part of the coarse-grained soil backfill layer, and the heat-insulating material adopts a polystyrene board (XPS).
The specific parameters of the construction design are as follows:
1. the cutting slope gradient is 1: 1.75. in order to protect high ice content frozen soil under the cutting slope, the slope overbreak thickness is 1.4 times of the natural upper limit value, but not more than 4.0m, and coarse granular soil is replaced and filled for heat preservation. The cutting is in a wrap angle form, the height of the cutting is 0.8m, and water-proof materials such as SBS are arranged. Before filling the heat-insulating layer, 2.0m wide steps are arranged on the excavated side slope, and geogrids with the width of 4.0m are laid in layers to prevent the heat-insulating layer from creeping along the filling-replacing excavated surface.
2. Replacing and filling coarse granular soil under the roadbed surface, wherein the replacement and filling thickness is 1.4 times of the natural upper limit value, but not more than 4.0 m; and paving a water-resisting material at a position of 0.2m below the roadbed surface.
3. If the frozen soil with high ice content is still below the base filling layer, a heat insulation material is laid at a position 0.80m below the roadbed surface, the heat insulation material adopts polystyrene boards (XPS), and medium-coarse sand cushions with the thickness of 0.10m are respectively laid above and below the heat insulation material for protection.
4. Heat pipes are arranged in the middle of the side ditch platforms at two sides in a staggered mode to protect permafrost, the longitudinal distance of the heat pipes along a line is 2.8m, the length of a single heat pipe is 12.0m, the diameter phi is 89mm, the exposed length is 2.5m (a condensation section), and the buried length is 9.5 m.
5. The moat outside sets up the manger plate low bank, when freezing the layer and go up the water and develop, for stopping freezing the layer and go up water infiltration cutting, sets up SPRE water proof material under the manger plate low bank.
6. The settlement widening value of the two sides of the roadbed surface is reserved to be 0.40-0.60 m.
7. The side ditches are assembled by adopting U-shaped concrete prefabricated parts, and the width of a side ditch platform is 2.0 m.
The construction method comprises the following steps:
1. the construction of cutting should be arranged as warm as possible in cold seasons. The filling, heat preservation, protection, drainage and other projects are finished before the spring melting.
2. Sufficient mechanical equipment and material materials are prepared before construction, and cover cloth, temporary supports and the like used in rainy and snowy days are prepared, so that the exposed area can be covered in time.
3. The cutting adopts a full-width, sectional and layered excavation method, firstly excavates a shade slope, and then excavates a sun slope. The frozen soil layer is preferably excavated by a scarifier method, and when the construction is difficult, the frozen soil layer can be excavated by a frozen soil blasting method. When the temperature is higher in the daytime, temporary sunshade and heat insulation protection should be carried out on the exposed frozen soil with high ice content.
4. The replacement and filling should be carried out in time after the segmental excavation, and the continuous operation and the rapid construction are carried out.
5. When the cutting slope is changed, steps are dug according to design requirements, geogrids are laid in layers, the sunny slope and the back cloudy slope are changed firstly, and the cutting slope is changed to the cutting top and then is used as a wrap angle and a water retaining bank. When the cut top is adopted for sending soil, the distance between the cut top pile and an excavation line and the pile height are noticed, and the cut slope is prevented from being unstable.
6. And laying heat insulating materials and water insulating materials according to the design during replacement and filling.
7. And after the replacement and filling are finished, constructing side ditch, hot bar and side slope protection projects according to the design.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.
Claims (7)
1. The utility model provides a plateau height contains frozen soil section railway cutting structure of ice content which characterized in that:
performing overbreak replacement and filling of coarse-grained soil on side slopes and slope bottoms on two sides of the cutting to form a coarse-grained soil replacement and filling layer which comprises side slope parts on two sides and a pavement part on a central plane;
vertical heat pipes (4) inserted into frozen soil are arranged on two sides of the road surface part, and side ditches are arranged on the surface of the coarse-grained soil replacement layer on the inner side of each heat pipe (4).
2. The railway cutting structure of the plateau high ice content frozen earth section as claimed in claim 1, characterized in that:
slopes on two sides of the cutting below the coarse-grained soil replacement and filling layer are in a step shape.
3. The railway cutting structure of the plateau high ice content frozen earth section as claimed in claim 2, characterized in that:
and the slope tops of the side slopes on two sides of the coarse-grained soil replacement and filling layer are provided with water retaining banks.
4. The railway cutting structure of the plateau high ice content frozen earth section as claimed in claim 3, characterized in that:
and water-proof materials (1) are arranged from the tops of the side slopes on the two sides of the coarse-grained soil backfill layer to the position below the natural upper limit (2) of the frozen soil, extend upwards to the coarse-grained soil backfill layer from the position below the natural upper limit (2) of the frozen soil and extend inwards to the side slopes on the two sides of the coarse-grained soil backfill layer.
5. The railway cutting structure of plateau high ice content frozen earth section as claimed in claim 4, wherein:
a water-proof material (1) and a heat-insulating material (5) are arranged in the road surface part of the coarse-grained soil backfill layer.
6. The railway cutting structure of the plateau high ice content frozen earth section as claimed in claim 5, wherein:
the coarse-grained soil replacement and filling layers of the slopes on the two sides of the cutting are of a layered structure along with the steps, and geogrids (3) are laid between the layers.
7. The railway cutting structure of the plateau high ice content frozen earth section as claimed in claim 6, wherein:
u-shaped precast concrete members are laid in the side ditches and longitudinally assembled and fully paved on the side ditches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920877290.6U CN210238158U (en) | 2019-06-12 | 2019-06-12 | Plateau high-ice-content frozen soil section railway cutting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920877290.6U CN210238158U (en) | 2019-06-12 | 2019-06-12 | Plateau high-ice-content frozen soil section railway cutting structure |
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| CN210238158U true CN210238158U (en) | 2020-04-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172872A (en) * | 2019-06-12 | 2019-08-27 | 中铁第一勘察设计院集团有限公司 | Plateau hight-ice-content permafrost ground section of railway track chasm structuref and its construction method |
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- 2019-06-12 CN CN201920877290.6U patent/CN210238158U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110172872A (en) * | 2019-06-12 | 2019-08-27 | 中铁第一勘察设计院集团有限公司 | Plateau hight-ice-content permafrost ground section of railway track chasm structuref and its construction method |
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