Construction method of recycler mixing cement improved soil on expressway top roadbed

Abstract

The invention discloses a construction method of a recycler mixing cement improved soil on an expressway top roadbed. The construction method of the recycler mixing cement improved soil on the expressway top roadbed comprises the steps of carrying out cement improved soil mixing ratio test; inspecting parameters, such as longitudinal section elevation, of a lower bearing layer to meet a construction condition; transporting plain soil to a construction site; after the filling of the plain soil is finished, using a bulldozer to roughly level off the plain soil; using a land leveller to finely level off the plain soil and measuring the elevation of the plain soil; using a full-automatic cement disperser to disperse lime; using a numerical control high-accuracy flow regulating valve to controlthe cement dispersing number; using a recycler and a sprinkling truck to sprinkle water water and mix, controlling the mixing depth by using a microcontroller, and using the numerical control high-accuracy flow regulating valve to control the water sprinkling amount; after the cement improved soil is mixed, detecting the compaction degree after the the cement improved soil is rolled and finely leveled off; curing the cement improved soil after the detection is finished, wherein the curing period is not less than 7 days; and after the construction of the first layer of the cement improved soilis finished, the first layer of the cement improved soil is disqualified through detection and the first layer of the cement improved soil is sprinkled with water and covered by soil to be cured, repeating the step 3 to the step 7 to carry out the construction of a second layer of the cement improved soil.

Description

technical field [0001] The invention relates to the technical field of road engineering construction, in particular to a construction method of mixing cement-improved soil with a recycling machine on a road bed on an expressway. Background technique [0002] The road bed is the foundation of the pavement structure layer. The construction quality of the road bed has a great influence on the overall stability and durability of the expressway pavement. As the lower bearing layer of the pavement structure layer, the quality of the upper road bed directly affects the entire expressway. Project success or failure. [0003] When low-liquid-limit silt is used as the filling material of the roadbed on the expressway, the main problems are: the silt particles are fine and uniform, the gradation is poor, and the gaps between the particles are not filled with fine clay particles, so it is difficult to form a tight filling. And embedded extrusion structure, resulting in unstable structu...

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Problems solved by technology

[0003] When low-liquid-limit silt is used as the filling material of the roadbed on the expressway, the main problems are: the silt particles are fine and uniform, the gradation is poor, and the gaps between the particles are not filled with fine clay particles, so it is difficult to form a tight filling. and embedded extrusion structure, resulting in unstable structure, high compressibility and water permeability; less clay content in soil, low plastic index, low cohesion, capillary development, and poor water retention

Cement-improved soil (a mixture of crushed soil, cement and water) is treated as the road bed on the expressway. The construction technology is relatively mature, but due to many processes and long construction time, the efficiency is low, and it is affected by factors such as soil quality and aging. How to quickly and efficiently do the construction of cement-improved soil on the road bed is the main problem faced and discussed by each unit

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