CN210481895U - Frost heaving prevention structure for ballastless track high-speed railway submerged roadbed in seasonal frozen soil area - Google Patents
Frost heaving prevention structure for ballastless track high-speed railway submerged roadbed in seasonal frozen soil area Download PDFInfo
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- CN210481895U CN210481895U CN201822182048.5U CN201822182048U CN210481895U CN 210481895 U CN210481895 U CN 210481895U CN 201822182048 U CN201822182048 U CN 201822182048U CN 210481895 U CN210481895 U CN 210481895U
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Abstract
A frost heaving prevention structure for a ballastless track high-speed railway immersed roadbed in a seasonal frozen soil area is used for effectively improving the frost heaving deformation prevention effect of an embankment in an immersed road section and facilitating construction. The roadbed comprises a roadbed body, a roadbed bottom layer and a roadbed surface layer which are sequentially filled from bottom to top, and drainage ditches are arranged outside slope feet on two sides of the roadbed. The top surface of the surface layer of the foundation bed is covered with a totally-enclosed asphalt concrete layer to prevent external moisture from entering the foundation bed of the roadbed. A layer of high-strength heat-insulation board is laid on the full section of the bottom layer of the foundation bed within the freezing depth range so as to reduce the freezing depth. The bottom layer of the foundation bed is filled on the gravel roadbed, and a steam-isolating and water-draining layer is laid between the bottom surface of the bottom layer of the foundation bed and the top surface of the gravel roadbed to isolate a channel for continuously transferring gaseous and liquid moisture to the surface layer of the foundation bed. And the water through and drainage pipes are arranged at intervals along the extending direction of the line on the steam-insulating and drainage layer at the bottom of the surface layer of the foundation bed and the bottom of the bottom layer of the foundation bed, and the water through and drainage pipes, the top surface of the steam-insulating and drainage layer and the top surface of the gravel roadbed are inclined towards the center of the roadbed to two sides to form a drainage slope. And thermal insulation protective roads are arranged on the outer sides of slope feet on two sides of the roadbed.
Description
Technical Field
The utility model relates to a high-speed railway roadbed, in particular to seasonal frozen soil district ballastless track high-speed railway roadbed frost heaving prevention structure that soaks.
Background
In seasonal frozen soil areas, the subgrade is mainly frozen and swollen. The main reason is that the water is enriched in the range of the bed, and is frozen under the action of negative temperature, and the volume is increased. Part of water comes from atmospheric precipitation, and part of water comes from underground water under the action of negative temperature, and when the roadbed begins to freeze, the water is gathered from the lower layer to the freezing front surface to form ice crystals and ice interlayers, so that frost heaving is generated. When the cover layer exists on the ground surface, the water in the area with higher underground temperature migrates to the lower part of the cover layer in the form of steam under the action of temperature gradient, is continuously condensed and gathered, even reaches a saturated state, and is phase-changed into ice at the freezing temperature, so that frost heaving is caused, which is called as a pot cover effect. In the water immersion road section, sufficient moisture in soil in the surrounding unfrozen area is easier to migrate and accumulate to the freezing area, and considerable frost heaving quantity is formed under the influence of the pot cover effect. But the problem of frost heaving prevention of the ballastless track laid on the water-immersed road section in the seasonal frozen soil area at present does not have a corresponding structural design.
Since the road bed should pass through in the form of fill in the flooded road section, the height of the road bed should not be too low, and therefore only the embankment structure is considered.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a seasonal frozen soil district ballastless track high-speed railway roadbed frost heaving prevention structure that soaks is provided to effectively improve the frost heaving resistant deformation effect of section embankment that soaks, be convenient for moreover construct.
The utility model provides a technical scheme that its technical problem adopted as follows:
the utility model discloses a seasonal frozen soil district ballastless track high speed railway roadbed structure that soaks, the roadbed includes bed body, bed bottom and the bed top layer of filling in proper order from bottom to top, sets up escape canal, characterized by outside roadbed both sides toe: the top surface of the surface layer of the foundation bed is covered with a totally-enclosed asphalt concrete layer to prevent external moisture from entering the foundation bed of the roadbed; a layer of high-strength heat-insulation board is laid on the full section of the bottom layer of the foundation bed within the freezing depth range so as to reduce the freezing depth; the foundation bed bottom layer is filled on the gravel roadbed, and a steam-isolating and water-draining layer is laid between the bottom surface of the foundation bed bottom layer and the top surface of the gravel roadbed to isolate a channel for continuously transferring gaseous and liquid moisture to the surface layer of the foundation bed; the bottom of the surface layer of the foundation bed and the bottom of the bottom layer of the foundation bed are provided with water through and drainage pipes at intervals along the extending direction of the line, and the water through and drainage pipes, the top surfaces of the water through and drainage layers and the top surface of the gravel roadbed are inclined towards the center of the roadbed to two sides to form a drainage slope; and heat-insulating protective roads are arranged on the outer sides of slope feet on two sides of the roadbed.
The design height H of the heat-preservation protective channel is equal to (the design water level + the wave invasion height + the water choking level) +0.5m, or the design height H is equal to the freezing depth +0.5m, and the larger value of the design height H and the water choking level is taken.
The water through-drainage pipe comprises left side water through-drainage pipe, and left side water through-drainage pipe inner disconnection, the outer end extends to the road bed domatic.
The utility model has the advantages that the high-strength heat-insulation board is arranged in the foundation bed to reduce the freezing depth, the water permeating and draining pipe is arranged to drain water, the bottom of the foundation bed is provided with the steam-isolating and water draining layer to furthest isolate the influence of the water on the roadbed, and the frost heaving deformation resistant effect of the embankment in the water-immersed road section can be obviously improved; is convenient for construction and is beneficial to reducing the engineering cost.
Drawings
The specification includes the following figures:
FIG. 1 is a sectional view of the anti-frost heaving structure of the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area;
the figures show the components and corresponding references: the foundation bed comprises a foundation bed surface layer 11, a foundation bed bottom layer 12, a foundation bed body 13, a gravel roadbed 14, a drainage ditch 15, a heat preservation protective channel 16, a totally-enclosed asphalt concrete layer 20, a heat preservation plate 21, a steam-isolation drainage layer 22, a left side water through-drainage pipe 23a, a right side water through-drainage pipe 23b and a design height H.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1, the utility model discloses a seasonal frozen soil district ballastless track high-speed railway roadbed structure that soaks, the roadbed includes bed body 13, bed bottom 12 and bed top layer 11 that from bottom to top filled in proper order, sets up escape canal 15 outside roadbed both sides toe. The top surface of the foundation bed surface layer 11 is covered with a totally-enclosed asphalt concrete layer 20 to prevent external moisture from entering the roadbed foundation bed; a layer of high-strength heat-insulation board 21 is laid on the full section of the bottom layer 12 of the foundation bed within the freezing depth range so as to reduce the freezing depth.
The foundation bed bottom layer 12 is filled on the foundation bed body 13, and the steam-isolating and water-draining layer 22 is laid between the bottom surface of the foundation bed bottom layer 12 and the top surface of the foundation bed body 13 to isolate the passage of the gas-state and liquid-state moisture continuously migrating to the foundation bed surface layer 11 and the foundation bed bottom layer 12. The bottom of the foundation bed surface layer 11 and the bottom of the foundation bed bottom layer 12 are provided with water through and drainage pipes at intervals along the line extension, and the water through and drainage pipes, the top surface of the water through and drainage layers 22 and the top surface of the foundation bed body 13 are inclined towards the center of the roadbed to two sides to form drainage slopes; and heat-insulating protective roads 16 are arranged on the outer sides of slope feet on two sides of the roadbed.
Referring to fig. 1, the main condition for frost heaving of the roadbed is moisture. The frost heaving occurs mainly because the water collected in the foundation bed cannot be smoothly discharged. Therefore, the utility model discloses cover at foundation bed top layer 11 and set up totally closed asphalt concrete layer 20, cut off the passageway that surface water invades the foundation bed. However, the arrangement of the totally-enclosed asphalt concrete layer 20 can form a pot cover effect, which is often a destination for upward migration of unfrozen water at the lower part after freezing, and more severe frost heaving may occur. In order to effectively prevent the pot cover effect, the utility model discloses synthesize and take following three kinds of technical measure: (1) the high-strength heat-insulation board 21 is paved on the inner full section of the foundation bed bottom layer 12 within the freezing depth range, so that the freezing depth is reduced; (2) arranging water through-drainage pipes at intervals of 5-10 m along the extending direction of the line on the bottom of the foundation bed surface layer 11 and the bottom of the foundation bed bottom layer 12 on the steam-isolating and water-draining layer 22, and timely draining water possibly permeating into the parts such as the roadbed slopes on two sides, the road shoulder cable grooves and the like; (3) a steam-isolating and water-draining layer 22 is laid between the bottom surface of the foundation bed bottom layer 12 and the top surface of the foundation bed body 13 to isolate the passage of the gas-state and liquid-state moisture continuously migrating to the foundation bed surface layer 11 and the foundation bed bottom layer 12. Even if the water is gathered in the layer, the water cannot be frozen and frost heaving cannot be generated because the water is below the freezing depth, and the water flows back to the embankment below the foundation bed under the action of gravity. In addition, the outer sides of the slope feet at the two sides of the roadbed are provided with heat-insulating protective roads 16 so as to eliminate frost heaving of the slope feet and ensure stable roadbed structure.
Referring to fig. 1, the design height H of the thermal protection tunnel 16 is equal to (the design water level + the wave attack height + the water stop level) +0.5m, or the design height H is equal to the freezing depth +0.5m, and the greater value is taken.
Referring to fig. 1, the water penetration and drainage pipes are arranged at intervals of 5-10 m along the extension direction of the line. The water through-drainage pipe is composed of a left water through-drainage pipe 23a and a right water through-drainage pipe 23b, the inner ends of the left water through-drainage pipe 23a and the right water through-drainage pipe 23b are disconnected, and the outer ends of the left water through-drainage pipe 23a and the right water through-drainage pipe 23b extend to the slope surface of the roadbed. In order to facilitate construction and prevent the foundation bed rolling process and damage caused by train load, the left side water through and drainage pipe 23a and the right side water through and drainage pipe 23b are made of steel pipes, and water through holes are formed in the pipe body at intervals and wrapped by water permeable geotextile.
The high-strength heat-insulation board 21 is made of an extruded polystyrene heat-insulation board, a polyurethane heat-insulation board and the like. The steam-isolating and water-draining layer 22 adopts a composite waterproof and water-draining board or a transverse water-draining type composite geomembrane. The roadbed filling adopts qualified filling meeting the standard requirements, wherein the foundation bed body is filled with gravels within the range influenced by flood.
The above is only used for illustrating the utility model relates to a some principles of seasonally frozen soil district ballastless track high-speed railway waterlogged paddy bed frost heaving prevention structure, not will the utility model discloses the limitation show with concrete structure and application scope in, so all corresponding modifications and equivalents that probably are utilized all belong to the utility model discloses the patent range who applies for.
Claims (8)
1. The utility model provides a seasonal frozen soil district ballastless track high speed railway roadbed structure that soaks, the roadbed includes rubble roadbed (14), bed body (13), bed bottom (12) and bed top layer (11) that fill from bottom to top in proper order, sets up escape canal (15), characterized by outside roadbed both sides toe: a totally-enclosed asphalt concrete layer (20) is covered on the top surface of the foundation bed surface layer (11) to prevent external moisture from entering the roadbed foundation bed; a layer of high-strength heat-insulation board (21) is laid on the full section of the foundation bed bottom layer (12) within the freezing depth range so as to reduce the freezing depth; the foundation bed bottom layer (12) is filled on the foundation bed body (13), a steam-isolating and water-draining layer (22) is laid between the bottom surface of the foundation bed bottom layer (12) and the top surface of the foundation bed body (13) to isolate a channel for continuously transferring gaseous and liquid moisture to the foundation bed surface layer (11) and the foundation bed bottom layer (12); the water through and drainage pipes are arranged at intervals along the extending direction of a line on the bottom of the surface layer (11) of the foundation bed and the steam and water separation and drainage layer (22) at the bottom of the bottom layer (12) of the foundation bed, and the water through and drainage pipes, the top surface of the steam and water separation and drainage layer (22) and the top surface of the foundation bed body (13) are inclined towards the center of the roadbed to two sides to form drainage slopes; and heat-insulating protective roads (16) are arranged on the outer sides of slope feet on two sides of the roadbed.
2. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 1, is characterized in that: the design height H of the heat-preservation protective channel (16) is equal to (the design water level + the wave invasion height + the water choking level) +0.5m, or the H is equal to the freezing depth +0.5m, and the larger value of the two is taken.
3. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 1, is characterized in that: the water permeating and draining pipes are arranged one by one at intervals of 5-10 m along the extending direction of the line.
4. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 3, is characterized in that: the water through-drainage pipe comprises a left side water through-drainage pipe (23a) and a right side water through-drainage pipe (23b), the inner ends of the left side water through-drainage pipe (23a) and the right side water through-drainage pipe (23b) are disconnected, and the outer end of the left side water through-drainage pipe and the outer end of the right side water through-drainage pipe extend to the slope.
5. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 4, is characterized in that: the left side water through-drainage pipe (23a) and the right side water through-drainage pipe (23b) are made of steel pipes, and water through holes are formed in the pipe body at intervals and wrapped with water-permeable geotextile.
6. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 1, is characterized in that: the high-strength heat-insulation board (21) is an extruded polystyrene heat-insulation board or a polyurethane heat-insulation board.
7. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 1, is characterized in that: the steam-isolating and water-draining layer (22) adopts a composite water-preventing and draining plate or a transverse water-draining type composite geomembrane.
8. The frost heaving prevention structure for the ballastless track high-speed railway immersed roadbed in the seasonal frozen soil area as claimed in claim 1, is characterized in that: and the foundation bed body (13) is filled with gravels within the range influenced by flood.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822182048.5U CN210481895U (en) | 2018-12-25 | 2018-12-25 | Frost heaving prevention structure for ballastless track high-speed railway submerged roadbed in seasonal frozen soil area |
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| CN201822182048.5U CN210481895U (en) | 2018-12-25 | 2018-12-25 | Frost heaving prevention structure for ballastless track high-speed railway submerged roadbed in seasonal frozen soil area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505201A (en) * | 2018-12-25 | 2019-03-22 | 中铁二院工程集团有限责任公司 | A kind of seasonal frozen soil region non-fragment orbit high-speed railway immersion roadbed anti-freeze expansion structure |
| CN113186953A (en) * | 2021-05-08 | 2021-07-30 | 江苏工程职业技术学院 | Distributed solar and wind energy plateau railway roadbed slope protection device, system and working method |
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2018
- 2018-12-25 CN CN201822182048.5U patent/CN210481895U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109505201A (en) * | 2018-12-25 | 2019-03-22 | 中铁二院工程集团有限责任公司 | A kind of seasonal frozen soil region non-fragment orbit high-speed railway immersion roadbed anti-freeze expansion structure |
| CN113186953A (en) * | 2021-05-08 | 2021-07-30 | 江苏工程职业技术学院 | Distributed solar and wind energy plateau railway roadbed slope protection device, system and working method |
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