CN216809384U - Railway roadbed suitable for island frozen soil area - Google Patents
Railway roadbed suitable for island frozen soil area Download PDFInfo
- Publication number
- CN216809384U CN216809384U CN202220484799.6U CN202220484799U CN216809384U CN 216809384 U CN216809384 U CN 216809384U CN 202220484799 U CN202220484799 U CN 202220484799U CN 216809384 U CN216809384 U CN 216809384U
- Authority
- CN
- China
- Prior art keywords
- roadbed
- pile
- foundation
- island
- joist
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Road Paving Structures (AREA)
Abstract
The utility model provides a railway roadbed suitable for island frozen soil areas, which comprises a pile plate structure, a heat insulation cushion layer and a roadbed bed; the pile plate structure comprises a bearing plate, a joist and a pile foundation, wherein the lower part of the pile foundation is embedded in a frozen soil layer, and the upper part of the pile foundation is exposed out of the ground; the joist is positioned above the pile foundation and is fixedly connected with the pile foundation; the bearing plate is positioned above the joist and connected with the joist; the roadbed bed is positioned between the ground and the bearing plate; the heat preservation bed course is laid between loading board and the roadbed bed below the loading board. The utility model replaces the traditional roadbed structure with the pile plate structure, lays the heat preservation cushion layer and lays the heat preservation cushion layer in the island-shaped frozen soil area, thereby not only effectively controlling the settlement and deformation of the roadbed, but also solving the problem of frost heaving and freezing damage of the roadbed.
Description
Technical Field
The utility model belongs to the technical field of railway subgrades, and particularly relates to a railway subgrade suitable for island frozen soil areas.
Background
In regions with seasonal frozen soil as a main part but island frozen soil, railway construction needs to control subgrade settlement deformation and solve the problems of damage to a track structure and smoothness of a line caused by frost heaving deformation. On one hand, the subgrade settlement deformation and frost heaving deformation in the island-shaped frozen soil area are caused by the fact that the frozen soil foundation is disturbed in railway construction and operation, the thermal stability of the frozen soil is changed, and the subgrade is subjected to the phenomena of thaw settlement, frost heaving and the like; on the other hand, the temperature rises in spring and summer due to the influence of seasons, frozen soil is melted, and the roadbed faces threats such as melting and sinking, slurry turning and the like; in winter, the air temperature is reduced, frozen soil expands, and frost heaving diseases are generated on the roadbed, so that the freeze thawing cycle is repeated, the deformation of the roadbed is increased, and the stability and the smoothness of the railway roadbed are reduced.
The common measures for solving the problem of frozen soil thawing and sinking comprise laying heat insulation materials, a flake air cooling roadbed, a hot bar roadbed and a ventilation pipe roadbed, and the measures can only achieve the purpose of controlling the frozen soil roadbed settlement by delaying the degradation of the frozen soil and cannot completely solve the problem of disease damage of the frozen soil roadbed; and a method of replacing roads with bridges can thoroughly solve the problem of damage of frozen soil subgrades, but the construction cost is higher.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides the railway roadbed suitable for the island frozen soil area, the pile plate structure and the heat preservation measure are combined, and the novel pile plate structure roadbed paved with the heat preservation plate cushion layer is formed by applying the pile plate structure and the heat preservation measure to the railway roadbed mainly comprising seasonal frozen soil but existing in the island permafrost area, so that the settlement and deformation of the roadbed can be effectively controlled, and the frost heaving disease of the roadbed can be solved.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a railway roadbed suitable for island frozen soil areas, which comprises a pile plate structure, a heat insulation cushion layer and a roadbed bed, wherein the pile plate structure comprises a pile plate layer and a heat insulation cushion layer; the pile plate structure is arranged between the roadbed foundation bed and the frozen soil layer to isolate the roadbed foundation bed and the frozen soil layer, the pile plate structure comprises a bearing plate, a joist and a pile foundation, the lower part of the pile foundation is embedded in the frozen soil layer, and the upper part of the pile foundation is exposed out of the ground; the joist is positioned above the pile foundation and is fixedly connected with the pile foundation; the bearing plate is positioned above the joist and connected with the joist; the roadbed bed is positioned between the ground and the bearing plate; the heat preservation bed course is laid between loading board and the roadbed bed below the loading board.
Preferably, the carrier plate is fixedly connected or hinged to the joist.
Preferably, the pile foundations are distributed in parallel in multiple rows in the transverse direction of the roadbed, the pile foundations are distributed at equal intervals in the longitudinal direction of the roadbed, and the tail end of each pile foundation is arranged below the upper limit of the frozen soil layer.
Preferably, the joist is fixedly connected with the pile tops of the pile foundations in rows along the transverse direction of the roadbed, and the joists are adjacently distributed along the longitudinal direction of the roadbed.
Preferably, the bearing plates are connected with the joists along the longitudinal direction of the roadbed, the bearing plates which are adjacent along the longitudinal direction of the roadbed are connected and are fixedly connected with one joists at the same time, and an expansion joint is arranged between the longitudinal connecting ends of the adjacent bearing plates.
Preferably, the pile foundation is a cast-in-situ bored pile.
Preferably, the heat-insulating cushion layer is made of EPS or XPS heat-insulating boards, and is fully paved between the bearing plate and the roadbed foundation bed.
Preferably, the subgrade bed is filled with non-frost heaving filler.
The utility model has the following beneficial effects:
the utility model provides a railway roadbed suitable for island frozen soil areas, which is characterized in that a traditional roadbed structure is replaced by a pile plate structure, a heat insulation cushion layer is laid and laid in the island frozen soil areas, so that the settlement and deformation of the roadbed can be effectively controlled, and the problem of frost heaving and frost damage of the roadbed can be solved.
The pile plate structure is applied to the roadbed in the island-shaped frozen soil area, the problem of roadbed settlement deformation caused by thaw settlement of the island-shaped frozen soil area is solved, and compared with a method of replacing roads with bridges, the construction cost can be effectively saved. Meanwhile, a heat insulation cushion layer is added on the pile plate structure, so that the freezing damage depth of the roadbed is effectively reduced, and the problem of frost heaving deformation of the roadbed is solved; the heat insulation and preservation function of the heat preservation cushion layer inhibits the downward transmission of external negative temperature, reduces the freezing depth and the increase of frost heaving amount, and can bear and absorb certain frost heaving displacement through the elastic deformation of the heat preservation cushion layer when the soil body at the lower part of the bearing plate is frost heaving. The method can be applied to railway construction in island frozen soil areas, and ensures the stability of railway subgrade and the smoothness of lines.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a schematic cross-sectional view of a railroad bed suitable for use in island frozen earth areas according to an embodiment of the present invention;
fig. 2 is a front view of a railroad bed suitable for island frozen earth areas according to an embodiment of the present invention.
Description of reference numerals:
1. a carrier plate; 2. a joist; 3. a pile foundation; 4. a heat-insulating cushion layer; 5. and (5) roadbed bed.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment provides a railway subgrade suitable for island frozen soil areas, which comprises a pile plate structure, a heat insulation cushion layer 4 and a subgrade bed 5, as shown in figures 1 and 2; the pile plate structure comprises a bearing plate 1, a joist 2 and a pile foundation 3, wherein the lower part of the pile foundation 3 is embedded in a frozen soil layer, and the upper part of the pile foundation 3 is exposed out of the ground; the joist 2 is positioned above the pile foundation 3, and the joist 2 is fixedly connected with the pile foundation 3; the bearing plate 1 is positioned above the joist 2, and the bearing plate 1 is fixedly connected or hinged with the joist 2; the roadbed bed 5 is positioned between the ground and the bearing plate 1; the heat preservation cushion layer 4 is laid between the bearing plate 1 and the roadbed 5 below the bearing plate 1. The pile plate structure transmits load to the pile body 3 through the bearing plate 1 and the joist 2, and then the load is diffused to the soil body and the foundation, so that the purpose of controlling the settlement deformation of the foundation subgrade is achieved.
The pile foundations 3 are distributed in parallel along a plurality of rows (not less than two rows) in the transverse direction of the roadbed, and the pile foundations 3 are distributed at equal intervals in the longitudinal direction of the roadbed; the tail end of each pile foundation 3 is arranged below the upper limit of the frozen soil layer. The joist 2 is fixedly connected with pile tops of a plurality of (not less than two) pile foundations 3 in rows along the transverse direction of the roadbed, and the joists 2 are adjacently distributed along the longitudinal direction of the roadbed. The bearing plate 1 is connected with the joist 2 along the longitudinal direction of the roadbed, the bearing plates 1 which are adjacent along the longitudinal direction of the roadbed are connected and are simultaneously fixedly connected with one joist 2, and an expansion joint is arranged between the longitudinal connecting ends of the adjacent bearing plates 1.
The pile foundation 3 is a cast-in-situ bored pile. The heat preservation cushion 4 adopts EPS or XPS heated board, and the heat preservation cushion 4 is full to be laid between loading board 1 and roadbed bed 5. Roadbed baseThe bed 5 is packed with non-frost heaving packing. Paving an anti-freezing layer in a harmful frost heaving depth range on the roadbed 5, wherein the filler of the anti-freezing layer meets the condition that the content of fine particles with the particle size of less than or equal to 0.075mm is less than 10%, and the permeability coefficient after compaction is not less than 1 multiplied by 10 < -5 > m/s; the filler is paved in the non-harmful frost heaving depth range, and the content of fine particles with the particle size of less than or equal to 0.075mm is less than 15%. Depth of harmful frost heaving hfCalculating according to the design freezing depth Z that the high-speed railway is not less than the design freezing depthdNormal railway not less than design freezing depth Zd60% of the total amount of the frozen food, design freezing depth ZdAccording to the formula Zd＝Z0×ψzs×ψzw×ψzc×ψzt0Calculation of, wherein Zd-roadbed design freezing depth; z is a linear or branched member0-standard freezing depth; psizs-coefficient of influence of soil classification on freezing depth; psizw-coefficient of influence of frost heaviness on freeze depth; psizc-the coefficient of influence of the surrounding environment on the depth of freezing; psizt0-influence coefficient of topographic environment on freezing depth.
The embodiment also provides a construction method of the railway roadbed suitable for the island frozen soil area, and the method comprises the following steps:
step S1, implementing pile foundation 3; the pile foundation 3 adopts a cast-in-place bored pile, and the drilling process is performed as far as possible without digging and filling, so that the disturbance to the frozen soil of the foundation is reduced; and after the construction of the pile foundation 3 is finished, the construction is carried out according to the requirements of technical regulations for detecting foundation piles of railway engineering, and the construction of the next procedure is carried out after the detection is qualified.
Furthermore, the transverse spacing of the pile foundations 3 is preferably 5.0m, the longitudinal spacing is preferably 7.5m, the pile diameter is preferably 1.2-1.5m, the pile bottom extends into permafrost soil, and the pile length is determined according to actual geological conditions.
Step S2, implementing the joist 2; the joist 2 is cast in situ by adopting a reinforced concrete structure and is fixedly connected with the top surface of the pile foundation 3 by connecting steel bars to form a whole.
Furthermore, the width of the joist 2 is 1.2-1.6m, the thickness is 0.8-1.0m, the length is determined according to the number of railway main lines, but the two ends of the joist need to exceed the range of the pile foundation 3 by 1.0-2.0 m.
Step S3, filling the roadbed 5; and the roadbed bed 5 is compacted by filling non-frost heaving filler in a layered mode, the roadbed slope is filled to be level with the top surface of the joist 2 at the ratio of 1:1.5, and a flat surface is formed.
Step S4, laying a heat-preservation cushion layer 4; the heat preservation cushion layer 4 is paved on the surface of the roadbed 5 in a full paving mode. The upper surface of the heat-insulating cushion layer 4 plays a role in inhibiting external negative temperature from transferring downwards, and the lower surface plays a role in controlling the temperature dissipation of the soil body at the lower part.
Furthermore, the heat-insulating cushion layer 4 is made of EPS or XPS heat-insulating board, the thickness is preferably 0.3-0.8m, and certain strength requirement should be met.
Step S5, implementing the bearing plate 1; the bearing plates 1 are of a reinforced concrete structure and are supported by a plurality of joists 2, and the end parts of two adjacent bearing plates 1 are fixedly connected to the same joists 2.
Further, the length of the bearing plate 1 is preferably 22.5 to 30.0m, the thickness is preferably 0.6 to 1.0m, and the width is determined according to the number of the main tracks of the railway.
According to the technical scheme, the railway roadbed suitable for the island frozen soil area that this embodiment provided replaces traditional roadbed structure by the pile sheet structure to lay the heat preservation bed course, lay in island frozen soil area, not only can effectively control the road bed and subside the deformation, can solve the frozen swelling freeze injury problem of road bed again. The pile plate structure is applied to the roadbed in the island-shaped frozen soil area, the problem of roadbed settlement deformation caused by thaw settlement of the island-shaped frozen soil area is solved, and compared with a method of replacing roads with bridges, the construction cost can be effectively saved. Meanwhile, the heat insulation cushion layer is added on the pile plate structure, so that the freezing damage depth of the roadbed is effectively reduced, and the problem of frost heaving deformation of the roadbed is solved; the heat insulation and preservation function of the heat preservation cushion layer inhibits the downward transmission of external negative temperature, reduces the freezing depth and the increase of frost heaving amount, and can bear and absorb certain frost heaving displacement through the elastic deformation of the heat preservation cushion layer when the soil body at the lower part of the bearing plate is frost heaving. The embodiment can be applied to railway construction in island frozen soil areas, and ensures the stability and the smoothness of the railway subgrade.
The embodiments of the present invention have been described in detail through the embodiments, but the description is only exemplary of the embodiments of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. The scope of protection of the embodiments of the utility model is defined by the claims. In the present invention, the technical solutions described in the embodiments of the present invention or those skilled in the art, based on the teachings of the embodiments of the present invention, design similar technical solutions to achieve the above technical effects within the spirit and the protection scope of the embodiments of the present invention, or equivalent changes and modifications made to the application scope, etc., should still fall within the protection scope covered by the patent of the embodiments of the present invention.
Claims (8)
1. A railway roadbed suitable for island frozen soil areas is characterized by comprising a pile plate structure, a heat insulation cushion layer (4) and a roadbed (5); the pile plate structure comprises a bearing plate (1), a joist (2) and a pile foundation (3), wherein the lower part of the pile foundation (3) is embedded in a frozen soil layer, and the upper part of the pile foundation (3) is exposed out of the ground; the joist (2) is positioned above the pile foundation (3), and the joist (2) is fixedly connected with the pile foundation (3); the bearing plate (1) is positioned above the joist (2), and the bearing plate (1) is connected with the joist (2); the roadbed foundation bed (5) is positioned between the ground and the bearing plate (1); the heat-insulating cushion layer (4) is laid between the bearing plate (1) and the roadbed foundation bed (5) below the bearing plate (1).
2. Railway foundation suitable for island frozen ground areas, according to claim 1, characterized in that the load bearing plates (1) are fixedly connected or hinged to the joists (2).
3. A railway roadbed suitable for island frozen soil areas, according to claim 1, wherein the pile foundations (3) are distributed in parallel in a plurality of rows in the transverse direction of the roadbed, the pile foundations (3) are distributed at equal intervals in the longitudinal direction of the roadbed, and the tail end of each pile foundation (3) is arranged below the upper limit of the frozen soil layer.
4. A railway foundation adapted for use in island frozen ground areas, according to claim 3, wherein the joists (2) are fixedly connected to the tops of the plurality of pile foundations (3) in rows transversely of the foundation, the joists (2) being arranged adjacent to each other longitudinally of the foundation.
5. A railway foundation adapted for island frozen ground areas according to claim 4, wherein the carrying floor (1) is connected to the joists (2) in the longitudinal direction of the foundation; the bearing plates (1) which are longitudinally adjacent along the roadbed are connected and are fixedly connected with one joist (2), and expansion joints are arranged between the longitudinal connecting ends of the adjacent bearing plates (1).
6. Railway foundation adapted for use in island frozen ground areas according to claim 1, wherein the pile foundation (3) is a cast-in-place bored pile.
7. The railway subgrade suitable for the island frozen soil areas according to the claim 1, wherein the heat-insulating cushion layer (4) is made of EPS or XPS heat-insulating plate, and the heat-insulating cushion layer (4) is fully laid between the bearing plate (1) and the subgrade bed (5).
8. A railway foundation adapted for use in island frozen ground areas according to claim 1, wherein the foundation bed (5) is filled with a non-frost-heaving filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220484799.6U CN216809384U (en) | 2022-03-04 | 2022-03-04 | Railway roadbed suitable for island frozen soil area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220484799.6U CN216809384U (en) | 2022-03-04 | 2022-03-04 | Railway roadbed suitable for island frozen soil area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216809384U true CN216809384U (en) | 2022-06-24 |
Family
ID=82044958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220484799.6U Active CN216809384U (en) | 2022-03-04 | 2022-03-04 | Railway roadbed suitable for island frozen soil area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216809384U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115680005A (en) * | 2022-10-09 | 2023-02-03 | 中交第一公路勘察设计研究院有限公司 | Assembled overhead structure of highway in high-intensity permafrost region and construction method |
| CN115839045A (en) * | 2022-12-15 | 2023-03-24 | 中铁西北科学研究院有限公司 | Roadbed uneven settlement deformation area renovation process and frozen soil renovation roadbed structure |
-
2022
- 2022-03-04 CN CN202220484799.6U patent/CN216809384U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115680005A (en) * | 2022-10-09 | 2023-02-03 | 中交第一公路勘察设计研究院有限公司 | Assembled overhead structure of highway in high-intensity permafrost region and construction method |
| CN115839045A (en) * | 2022-12-15 | 2023-03-24 | 中铁西北科学研究院有限公司 | Roadbed uneven settlement deformation area renovation process and frozen soil renovation roadbed structure |
| CN115839045B (en) * | 2022-12-15 | 2023-10-20 | 中铁西北科学研究院有限公司 | Roadbed differential settlement deformation region remediation process and frozen soil remediation roadbed structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN216809384U (en) | Railway roadbed suitable for island frozen soil area | |
| RU2379405C1 (en) | Embankment on frozen soil | |
| CN110485228A (en) | The high-intensitive highway subgrade structure of the closed anti-freeze expansion frost boiling of hydro-thermal and construction method | |
| CN204401387U (en) | A kind of seasonal frost region anti-freeze expansion road structure based on XPS warming plate and banket | |
| CN111979866B (en) | Roadbed anti-freezing structure in seasonal frozen soil area and construction method thereof | |
| CN101956356B (en) | Novel subgrade structure for preventing road frost boiling in cold area | |
| CN109736141A (en) | The anti-freeze expansion structural body and paving method of Railway Roadbed in Permafrost Regions | |
| CN103255694B (en) | Frozen ground regions non-fragment orbit cutting bed of rapid transit railway structure | |
| CN105178126A (en) | Road-bridge transitional zone composite structure in permafrost region and construction method | |
| Haghi et al. | Using field data to evaluate bottom ash as pavement insulation layer | |
| CN110846963A (en) | Steel plate structure, steel plate pavement structure and construction method thereof | |
| CN207749375U (en) | A kind of seasonal frost region anti-freeze expansion road structure | |
| CN101418565A (en) | Qinghai-tibet railway permafrost wetland ground treatment technique | |
| CN211848680U (en) | Steel plate structure and steel plate pavement structure | |
| CN208328584U (en) | A kind of extremely frigid zones highway subgrade structure | |
| Ashpiz | The problems of the railway subgrade construction in the subarctic part of the Russian cryolithozone and the ways of their solution | |
| CN111101413A (en) | Device applied to salinized soil subgrade in seasonal frozen soil area and construction method | |
| CN110130155A (en) | A kind of novel nano hot pin high-speed rail roadbed of the anti-roadbed frost damage in seasonal frozen soil region | |
| CN213896585U (en) | Fill roadbed structure suitable for water-rich low-lying permafrost region | |
| CN112342858A (en) | Permafrost region precast hollow slab base pavement structure | |
| Oosterbaan et al. | Use of insulating layer to attenuate frost action in highway pavements | |
| CN210177277U (en) | Novel nanometer hot rod high-speed railway foundation for preventing roadbed frost heaving in seasonal frozen soil area | |
| CN210238158U (en) | Plateau high-ice-content frozen soil section railway cutting structure | |
| CN203320371U (en) | Ballastless track high-speed railway cutting foundation bed structure for a seasonally frozen ground area | |
| CN108677639A (en) | A kind of extremely frigid zones highway subgrade structure and construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |