Construction method of graded broken stone and cement composite packing layer

A technology of graded gravel and construction method, applied in ballast layer, infrastructure engineering, roads, etc., can solve problems such as affecting normal use function, shrinkage cracks in filling layer, etc., to reduce roadbed diseases, simple and convenient operation, and improve The effect of construction quality

Active Publication Date: 2015-08-19
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing railway subgrade transition section and subgrade surface diseases show that the current construction methods and measures for graded gravel mixed with cement filler are difficult t

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Construction method of graded broken stone and cement composite packing layer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Specific examples:

[0030] After the graded crushed stone mixed with cement filler is filled and the rolling compaction meets the compaction standard (the foundation coefficient K30≥190MPa / m and Evd≥55MPa), the watering maintenance is carried out, and the dynamic deformation modulus Evd is detected after one day. When Evd≥80MPa (if If it does not meet the requirements, continue to maintain until the index requirements are met), and use a filling and rolling road roller to roll by vibration to make the filling layer generate network cracks, so as to eliminate the partial shrinkage caused by the drying shrinkage and temperature shrinkage of graded crushed stone mixed with cement stress to avoid the formation of severe shrinkage cracks. After each vibration rolling, check the dynamic deformation modulus Evd. When the detection index is about 60% of that before the vibration rolling, stop rolling, cover with water for 7 days or after the cracks are healed, lay a geogrid on the fil...

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

No PUM Login to view more

Abstract

The invention discloses a construction method of a graded broken stone and cement composite packing layer. The construction method includes watering to cover and maintain after filling and grinding of graded broken stone and cement filler meet the compacting standard; detecting the setting and hardening degree of the packing layer after a day, detecting dynamic deformation modulus Evd, the foundation coefficient K30 and/or secondary deformation modulus Ev2 indicators of the packing layer by a test instrument, grinding in a vibration manner by a road roller adopting filling and grinding if the indicators are up to the set values, so that the packing layer can generate map cracks so as to eliminate partial shrinkage stress generated by drying shrinkage and temperature shrinkage of the graded broken stone with the cement, and serious shrinkage cracks are avoided; stopping grinding if the indicators reach 55-65% of the preset value before vibratory grinding; watering again to cover and maintain for seven days or paving geogrid on the packing layer after the cracks are healed automatically, and paving, grinding, maintaining, cracking and constructing on the former layer. The construction method can control shrinkage cracks of the graded broken stone with the cement and is applicable to filling and construction of filler of the graded stone with the cement in different mixing amounts.

Description

technical field [0001] The invention relates to a railway embankment engineering construction technology, in particular to a construction method for graded crushed stone mixed with cement filling layer. Background technique [0002] In the construction of railway subgrade engineering, in order to ensure the strength, stiffness and water stability of the subgrade, the transition section of the subgrade and the surface of the subgrade bed of the high-speed railway are usually filled with graded crushed stone mixed with cement. At the junction of the railway subgrade and the bridge, due to the great difference in stiffness between the subgrade and the bridge, it will inevitably cause a sudden change in the stiffness of the track. Near the transition point of the road and bridge, it is easy to produce poor deformation, which will affect the smooth and safe operation of the train. In order to reduce the deformation difference between roads and bridges and gradually change the tra...

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
no application Login to view more
IPC IPC(8): E01B1/00E01B2/00E02D3/00E02D3/12
CPCE01B2/006E02D3/005E02D3/123
Inventor 肖金凤杨永强孙嘉良邢亮王慨慷王治斌
Owner CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap