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Preparation method of special high-intensity polypropylene geotextile for ballastless track of high-speed rail

A ballastless track and geotextile technology, used in non-woven fabrics, textiles and papermaking, can solve the problems of easy loosening of tensile properties, distance between tensile properties, hidden dangers of train traffic, etc. The effect of consistent fracture properties and good smoothness

Active Publication Date: 2016-08-03
DONGGUAN CITY XIN YUAN NON WOVEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because when the train passes, stress will be applied to the geotextile layer in multiple directions. When the vertical and horizontal tensile properties of the geotextile layer are inconsistent, the direction with poor tensile performance will easily loosen or even break, thus affecting the stability of the ballastless track. The stability of the ballastless track deteriorates, which brings hidden dangers to train traffic
The existing geotextiles dedicated to high-speed rail ballastless tracks generally have a large gap in longitudinal and horizontal tensile properties, which cannot well meet the needs of high-speed rail ballastless tracks.

Method used

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  • Preparation method of special high-intensity polypropylene geotextile for ballastless track of high-speed rail
  • Preparation method of special high-intensity polypropylene geotextile for ballastless track of high-speed rail
  • Preparation method of special high-intensity polypropylene geotextile for ballastless track of high-speed rail

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing high-strength polypropylene geotextiles for high-speed rail ballastless tracks, including the following steps: A. Laying polypropylene fibers to form a web to obtain a fiber web; B. Continue to cross-lay fibers above and / or below the fiber web The mesh is formed into a cross-mesh fabric; C. The cross-mesh fabric obtained in step B is subjected to a needle punching and perforation treatment, and a blow hole treatment is performed to obtain a once-treated geotextile; D. A bending and overlapping treatment: along the perpendicular to the once-treated geotextile The direction of movement is reciprocally bent to form a bent part, and the folding line is perpendicular to the running direction of the primary treated geotextile, and the flattening treatment is performed so that the bent parts are partially overlapped after being flattened to obtain the secondary treated geotextile; E. Bending overlap treatment: reciprocating bending treatment in the directi...

Embodiment 2

[0033] A method for preparing high-strength polypropylene geotextiles for high-speed rail ballastless tracks, including the following steps: A. Laying polypropylene fibers to form a web to obtain a fiber web; B. Continue to cross-lay fibers above and / or below the fiber web The mesh is formed into a cross-mesh fabric; C. The cross-mesh fabric obtained in step B is subjected to a needle punching and perforation treatment, and a blow hole treatment is performed to obtain a once-treated geotextile; D. A bending and overlapping treatment: along the perpendicular to the once-treated geotextile The direction of movement is reciprocally bent to form a bent part, and the folding line is perpendicular to the running direction of the primary treated geotextile, and the flattening treatment is performed so that the bent parts are partially overlapped after being flattened to obtain the secondary treated geotextile; E. Bending overlap treatment: reciprocating bending treatment in the directi...

Embodiment 3

[0043] A method for preparing high-strength polypropylene geotextiles for high-speed rail ballastless tracks, including the following steps: A. Laying polypropylene fibers to form a web to obtain a fiber web; B. Continue to cross-lay fibers above and / or below the fiber web The mesh is formed into a cross-mesh fabric; C. The cross-mesh fabric obtained in step B is subjected to a needle punching and perforation treatment, and a blow hole treatment is performed to obtain a once-treated geotextile; D. A bending and overlapping treatment: along the perpendicular to the once-treated geotextile The direction of movement is reciprocally bent to form a bent part, and the folding line is perpendicular to the running direction of the primary treated geotextile, and the flattening treatment is performed so that the bent parts are partially overlapped after being flattened to obtain the secondary treated geotextile; E. Bending overlap treatment: reciprocating bending treatment in the directi...

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Abstract

The invention relates to the technical field of ballastless tracks and particularly relates to a preparation method of a special high-intensity polypropylene geotextile for a ballastless track of a high-speed rail. The preparation method comprises the following steps: A, spreading polypropylene fibers and carrying out net formation treatment to obtain a fiber mesh; B, continually crossly spreading fiber meshes above and / or below the fiber mesh to form a crossed mesh fabric; C, carrying out primary needling puncturing treatment on the crossed mesh fabric obtained by the step B, and carrying out pore blowing treatment to obtain a primary treated geotextile; D, carrying out primary bending and overlapping treatment; E, carrying out secondary bending and overlapping treatment; F, carrying out ternary bending and overlapping treatment; and G, carrying out three times of needling puncturing treatment on the geotextile subjected to four times of treatment to obtain a semi-finished geotextile, then carrying out final two times of up-down needling treatment on the semi-finished geotextile, and finally, carrying out hot pressing sizing treatment on the semi-finished geotextile and trimming and winding to obtain the finished geotextile. The geotextile disclosed by the invention has a good anti-breaking property and consistent vertical and horizontal tensile properties, and is unlikely to break when subjected to stress of a plurality of different directions.

Description

Technical field [0001] The invention relates to the technical field of ballastless tracks, in particular to a method for preparing high-strength polypropylene geotextiles for high-speed railway ballastless tracks. Background technique [0002] The structure of ballastless track is accepted by high-speed railways all over the world for its characteristics of high ride comfort, high stability, high durability and high reliability. Ballastless track structure is also widely used in high-speed railways in my country. In order to ensure good stability of the ballastless track, it is necessary to pour a 50-80cm cement dojo below the track, and then build a ballastless track above the cement dojo. The thickness of the cement dojo is large and the drying time of the cement is longer. If you simply wait for the cement dojo to dry before doing further construction, it will seriously delay the progress of the project. In order to effectively shorten the construction period, a geotextile lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/4291D04H1/48D04H1/70D04H1/732
CPCD04H1/4291D04H1/48D04H1/70D04H1/732
Inventor 谢铁冬
Owner DONGGUAN CITY XIN YUAN NON WOVEN