Isolation waterproof filling method for treating surface layer of highway foundation

Abstract

The invention discloses an isolation waterproof filling method for treating the surface layer of a highway foundation. The isolation waterproof filling method comprises the following steps: firstly, a ditch is opened on a surface-dredged silt foundation with a high groundwater level or a sludge-dredged ditch pond to arrange a water drainage system, and a water pump is mounted to conduct water pumping and reducing; secondly, a waterproof cloth is laid on the silt foundation of which surface water is pumped or the ditch pond, and joints of the waterproof cloth are overlapped by adopting a widthof at least 1m; and thirdly, a layer of evenly stirred lime soil with a thickness of 50cm to 60cm is paved on the waterproof cloth, is pressed by 3 times to 4 times by using a tracked machine, and stands for 4 days to 5 days to enable the lime soil to be hardened and formed. The isolation waterproof filling method has the advantages of simple process, short construction period, good pressing stabilization effect and high base quality, and the base compaction degree meets the design requirement.

Description

technical field [0001] The invention belongs to the construction technology of highway traffic infrastructure construction, and in particular relates to an isolation and waterproof filling method for highway foundation surface treatment. Background technique [0002] As we all know, with the rapid development of the economy, China's road traffic infrastructure has made great progress, the road is getting wider and wider, bounded by the center line of the road, the road is composed of 1 / 2 subgrade in the left and right halves, 1 The / 2 roadbed is composed of 1 / 2 central divider, half road surface and road shoulder. The longitudinal surface of the half road surface is the foundation surface layer, backfill layer, roadbed filling layer and road surface structure layer from bottom to top. At present, some expressways or a The grade road is expanded on the basis of the original old road, that is, it is built on the original ground on one or both sides of the old road. There may b...

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Problems solved by technology

[0003] When filling the roadbed on the silt foundation with a high groundwater level, after the surface of the roadbed is cleared or the ditches and ponds are dredged, lime soil is generally used for pre-filling treatment of the roadbed and the compactness of the basement required by the design cannot be achieved, that is, as the saying goes The so-called unstabilized, compacted and stable is referred to as "compressed and stable". Usually, 40-50 cm thick gravel clay (or lime soil) or broken brick and stone construction waste is used for filling and compacting treatment to meet the design requirements. solidity; using crushed stone clay (or lime soil) to carry out pre-filling treatment on the subgrade has a better "pressure stability" effect but the cost is relatively high, and the cost is about 70-100 yuan per cubic meter; using crushed brick and stone construction waste The "pressure stability" effect of the pre-filling treatment of the subgrade is also relatively good, but the source of crushed brick and stone construction waste is limited, and its cost is relatively high, about 70-80 yuan per cubic meter; use geotechnical woven bags Filling plain soil or construction waste to carry out pre-filling treatment on the roadbed has a significant "pressure stabilization" effect, but its material source is limited and the construction process is relatively complicated, which costs about 24.10, 80.00-90.00 yuan / m3; lime It is difficult to stabilize the pressure and form if it is directly filled with soil; using crushed stone clay (or lime soil) or crushed brick and stone construction waste to carry out pre-fill treatment on silt roadbeds or ditches and ponds, not only the engineering cost is relatively high, but also the roadbed formed by it The bottom layer is permeable, which cannot seal water and waterproof the subgrade, and its integrity is poor; the subgrade layer formed by filling the subgrade with plain soil or construction waste with geotechnical woven bags is also permeable, and also has no effect on the subgrade. To the effect of sealing water and waterproofing, the integrity is relatively poor

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