High-speed railway asphalt graded broken stone foundation bed and construction method thereof

A technology of graded crushed stone and high-speed railway, applied in the direction of road, track, ballast layer, etc., can solve the problem that asphalt graded crushed stone is difficult to be compacted to the target porosity, unable to meet the performance requirements of indoor mix ratio, asphalt grading Gravel aging and other problems, to achieve the effect of improving the quality control system, improving the bearing capacity of the roadbed, waterproof and drainage capacity, and prolonging the service life

Pending Publication Date: 2020-10-16
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the construction temperature of each link is too high, it will cause the aging of the asphalt graded macadam and affect its service life; if the construction temperature of each link is too low, the viscosity of the asphalt material will be high, making it difficult to compact the asphalt graded macadam to the target porosity (design void ratio), unable to meet the performance requirements achieved by the indoor mix ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] For a site, the designed thickness of the asphalt graded macadam bed is 8cm, and the specification of the asphalt graded macadam used is AGCS-16. For the sections that meet the construction conditions of the site, the construction will be carried out in 4 days.

[0086] Day 1:

[0087] (1) Before the construction of asphalt graded macadam, check and confirm that the pre-buried pipelines and cables have been constructed, so as to avoid excavation after the completion of asphalt graded macadam, which will damage the integrity of asphalt graded macadam. (2) Use anti-pollution blankets to protect cable trough drains, water collection wells, catenary pillars, etc. (3) Protect the subgrade deformation observation device by using a known protection device. (4) Review the top elevation, geometric size and quality of the graded crushed stones on the surface of the subgrade bed, so that the top elevation, geometric dimensions and quality of the graded crushed stones on the surf...

Embodiment 2

[0100] For a site, the design thickness of the asphalt graded gravel bed is 15cm, the specification of the upper layer of asphalt graded gravel is AGCS-16, and the thickness is controlled according to 8cm; the specification of the lower layer of asphalt graded gravel is AGCS-20, and the thickness According to the control of 7cm; the section with construction conditions for the site shall be constructed in 5 days.

[0101] Day 1:

[0102] (1) Before the construction of asphalt graded macadam, check and confirm that the pre-buried pipelines and cables have been constructed, so as to avoid excavation after the completion of asphalt graded macadam, which will damage the integrity of asphalt graded macadam. (2) Use anti-pollution blankets to protect cable trough drains, water collection wells, catenary pillars, etc. (3) Protect the subgrade deformation observation device by using a known protection device. (4) Review the top surface elevation, geometric size and quality of the gr...

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Abstract

The invention provides a construction method of a high-speed railway asphalt graded broken stone foundation bed. The construction method comprises the following steps of construction preparation, spreading of permeable asphalt and / or adhesive asphalt, mixing of asphalt graded broken stone, transportation of the asphalt graded broken stone, paving of the asphalt graded broken stone, compaction of the asphalt graded broken stone and maintenance of the asphalt graded broken stone. The invention also provides the high-speed railway asphalt graded broken stone foundation bed prepared by the method.The asphalt graded broken stone foundation bed prepared through the construction method serves as a new high-speed railway subgrade structure form, subgrade filler can be saved, the subgrade bearingcapacity and the waterproof and drainage capacity are improved, the subgrade service life is prolonged, and the asphalt graded broken stone foundation bed has wide application prospects and remarkableeconomic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of high-speed railway embankment structures. Specifically, the invention relates to a high-speed railway asphalt graded crushed stone bed and a construction method thereof. Background technique [0002] The main subgrade structure of my country's high-speed railways is mainly composed of the surface layer of the subgrade bed and the bottom layer of the subgrade bed. The surface layer of the subgrade bed is graded crushed stone of railway type I or type II, and cement can be added to the graded crushed stone when anti-frost heaving of the subgrade is considered. ; The bottom layer of the bed is composed of A and B groups of fillers. [0003] Asphalt graded crushed stone is composed of asphalt, coarse aggregate, fine aggregate, limestone powder, asphalt reinforcing agent, etc. It has the characteristics of good water resistance, bearing capacity, crack resistance and fatigue resistance. Laying the full sectio...

Claims

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Application Information

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IPC IPC(8): E01B1/00E01B27/02
CPCE01B1/001E01B1/008E01B27/02
Inventor 蔡德钩叶阳升姚建平楼梁伟石越峰杨国涛魏少伟吕宋耿琳叶晓宇张也庞帅李斯孙宣李吉亮张志超杨伟利
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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