Ballastless track composite reinforced prestressed bed structure and construction method of high-speed railway
A ballastless track and high-speed railway technology, applied in the direction of track, road, ballast layer, etc., can solve the problem of ballast compaction and reduction of subgrade elasticity, difficulty in ensuring subgrade compaction quality, poor permeability of subgrade surface filler, etc. problems, to achieve the effect of preventing roadbed muddying disease, preventing roadbed disease occurrence, and improving the stability of subgrade
Active Publication Date: 2022-07-29
SOUTHWEST JIAOTONG UNIV
View PDF14 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
During the construction and operation of embankments and transition sections in special soil areas, the following problems are faced: (1) When using traditional roadbed structure types and construction methods, when embankments are built on special soil foundations, due to the weight of the filler, the settlement deformation is large ; In order to control the post-construction settlement to meet the design requirements, it is necessary to reinforce the special soil foundation, often the reinforcement cost will account for about two-thirds of the total cost, and the reinforcement cost is huge; The area of the working surface is narrow, and medium and large compaction machines cannot enter the site, which makes it difficult to guarantee the compaction quality of the foundation bed
The existing technology adopts the inverted trapezoidal transition section structure and improves the filling standard. Although it has certain engineering effects, uneven settlement will inevitably occur after long-term operation, and the engineering cost and construction cost are relatively high.
(3) In the later operation process, the traditional soil subgrade is soaked and softened by water, and under the dynamic load of the train, mud gushes out along the gap of the ballast to the surface of the subgrade, resulting in the phenomenon of mud turning, resulting in dirty ballast bed and ballast compaction And the elasticity of the foundation bed is reduced, which greatly reduces the quality of line operation, resulting in a substantial increase in later maintenance costs
All of the above can realize the functions of waterproof and drainage, but they do not have the ability to resist muddying
If the filler quality and construction conditions in some road sections lead to poor permeability of the filler on the surface of the subgrade bed, the problem of slurrying will still occur
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0039] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0040] like figure 1As shown, a ballastless track composite reinforced prestressed bed structure of a high-speed railway, from top to bottom, comprises a bed surface layer 1, an upper portion of the bed bottom layer 2 and a lower portion of the bed bed bottom layer 3; The lower part is provided with a strip foundation 5; the surface layer 1 of the foundation bed is made of graded crushed stone, and the upper part is provided with a plurality of reinforcing ribs, which form an anti-turning slurry cell; the reinforcing ribs are arranged in an array; The drainage layer, the waterproof and drainage layer is inclined from one side to the other side; figure 2 As shown; the upper part 2 of the subgrade bottom layer is made of foam light soil doped with short fibers, and a geogrid 7 is arranged inside;
[0041] The thickness of the surface layer 1 of ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a ballastless track composite reinforced prestressed bed structure and a construction method for a high-speed railway. From top to bottom, it comprises a bed surface layer, an upper portion of a bed bottom layer and a lower portion of the bed bed; Strip foundation; the surface layer of the foundation bed is made of graded gravel, and the upper part is provided with a plurality of reinforcing ribs, which form an anti-turning slurry cell; the bottom of the foundation surface is provided with a waterproof and drainage layer, which is inclined from one side to the other. The waterproof and drainage layer is located on the lower side and is provided with a drainage hole at the corresponding panel; the upper part of the bottom layer of the subgrade is prepared from foam light soil doped with short fibers, and a geogrid is arranged inside; The structure of the invention has higher strength, stability and durability, can effectively reduce diseases such as subgrade settlement, mud churn, etc., improve construction efficiency, reduce construction expenses and operation and maintenance costs, and adapt to high-speed railway ballastless track subgrades. Construction requirements for special soil areas and transitional sections.
Description
technical field [0001] The invention relates to the technical field of high-speed railway subgrade, in particular to a composite reinforced prestressed base bed structure and a construction method of a ballastless track of a high-speed railway. Background technique [0002] With the construction and development of high-speed railways in my country, many lines inevitably pass through special soils such as expansive soil, soft soil and collapsible loess and rainy areas. During the construction and operation of embankments and transition sections in special land areas, the following problems are faced: (1) When using traditional roadbed structure types and construction methods, when building embankments on special land foundations, due to the weight of fillers, the settlement and deformation are large. ; In order to control the post-construction settlement to meet the design requirements, special soil foundations need to be reinforced, often the reinforcement cost will account ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(China)
IPC IPC(8): E01B2/00E01B1/00
CPCE01B2/00E01B1/002E01B1/008
Inventor黄俊杰王鑫越贺鑫邓浩然黄志超卢洺宇闫凯旋
OwnerSOUTHWEST JIAOTONG UNIV