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Waterproof structure of railway subgrade and its laying method

A technology for railway subgrade and waterproof structure, applied in infrastructure engineering, roads, tracks, etc., can solve the problems of poor durability, easy to be punctured by ballast, and unable to improve the strength of the subgrade.

Active Publication Date: 2017-12-26
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, impermeable geotextiles are used for waterproofing in engineering. The process is simple, but there are problems such as poor durability, easy to be punctured by ballast, and cannot improve the strength and stiffness of the foundation bed.

Method used

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  • Waterproof structure of railway subgrade and its laying method
  • Waterproof structure of railway subgrade and its laying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Such as figure 1 As shown, the waterproof structure of the railway subgrade is a waterproof layer 3 arranged between the surface of the railway subgrade 1 and the ballast, and the waterproof layer 3 is composed of crushed stones accumulated on the surface of the railway subgrade 1 and polymer waterproof paint filled in the gap between the crushed stones , the waterproof layer 3 has a double-sided drainage slope of 5%, the water that seeps down to the waterproof layer 3 is isolated by the waterproof layer 3, and then flows out of the waterproof layer 3 through the drainage slope.

[0014] The laying method of the waterproof structure is as follows: lay gravel with an average particle size of 6mm on the surface of the railway subgrade 1, the laying thickness is 5cm, the transverse width of the main line is 5m, and the distance from the bottom of the rail is 30cm; Spray the polyurethane waterproof coating into the gravel gap in the direction, and then spray the polyurethan...

Embodiment 2

[0017] The laying method of the waterproof structure is as follows: Firstly, a uniform, dense and flat sand cushion layer 2 is laid, the average particle size of the sand material is 3 mm, and the laying thickness is 5 cm. Then the crushed stones with an average particle size of 6mm are laid on the above-mentioned sand cushion 2, the laying thickness is 5cm, the transverse width on the main line is 5m, and 30cm away from the bottom of the rail; Spray into the gravel gap, and then spray the polyurethane waterproof coating into the gravel gap along the direction parallel to the longitudinal direction of the line, so that the polyurethane waterproof coating fills all the gravel pores. After the polyurethane waterproof coating in the gravel gap is completely solidified, That is to obtain the waterproof layer 3; then paving the gravel layer 4 which protects the waterproof layer 3 on the surface of the waterproof layer 3, the average particle size of the gravel used is 8 mm, and the ...

Embodiment 3

[0019] The laying method of the waterproof structure is as follows: Firstly, a uniform, dense and flat sand cushion layer 2 is laid, the average particle size of the sand material is 3 mm, and the laying thickness is 5 cm. Then the crushed stones with an average particle size of 6mm are laid on the above-mentioned sand cushion 2, the laying thickness is 3cm, the transverse width on the main line is 6m, and 30cm away from the bottom of the rail; Spray into the gravel gap, and then spray the polyurethane waterproof coating into the gravel gap along the direction parallel to the longitudinal direction of the line, so that the polyurethane waterproof coating fills all the gravel pores. After the polyurethane waterproof coating in the gravel gap is completely solidified, That is to obtain the waterproof layer 3; then paving the gravel layer 4 which protects the waterproof layer 3 on the surface of the waterproof layer 3, the average particle size of the gravel used is 8 mm, and the ...

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Abstract

The invention discloses a railroad bed waterproof structure and a pavement method thereof. The waterproof structure is located between a railroad bed and railway ballast and comprises a waterproof layer which comprises gravel stacked on the surface of the railroad bed and a waterproof polymer coating arranged in gravel gaps in a filling manner; the waterproof polymer coating is poured or sprayed into the gravel gaps, and the waterproof layer is obtained after solidification of the waterproof coating; the waterproof layer is 3-6 cm thick and is 25-35 cm away from the rail flange, and the horizontal width of a main track is 4-6 m; the average particle size of the gravel is 5-7 mm. With the adoption of the pavement method, the waterproof layers with different thicknesses can be paved according to specific demands, the pavement method is simple and fast; the waterproof structure has excellent waterproof performance and comprehensive mechanical performance; further, the waterproof structure further comprises a sand bed arranged between the railroad bed and the waterproof layer as well as a gravel layer arranged between the waterproof layer and the railway ballast, and the mechanical performance and the waterproof performance of the waterproof structure can be further improved.

Description

technical field [0001] The invention relates to a novel railway subgrade waterproof structure and a laying method of the waterproof structure. Background technique [0002] The subgrade bed is the area most affected by train dynamic load, climate and environment (rainwater, surface water and freezing and thawing) in the subgrade structure, and it requires sufficient strength and rigidity. The rock-soil granular material used as the foundation bed filler can only provide sufficient bearing capacity and perform its function under the optimal moisture content state; under the erosion and softening of water, it will gradually lose its function, affecting the comfort and safety of train operation sex. After many years of operation of the existing railway line, the existing drainage structure of the subgrade, such as the lateral drainage slope, was damaged, and the surface water seeped down to the surface of the subgrade bed through the ballast, and could not be discharged in a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01B2/00E01B1/00E02D31/02
CPCE01B1/00E01B1/008E01B2/00E02D31/025
Inventor 苏谦刘亭王武斌王迅黄俊杰刘凯文
Owner SOUTHWEST JIAOTONG UNIV
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