Roadbed splicing construction method in expressway reconstruction and extension

Abstract

The invention discloses a roadbed splicing construction method in expressway reconstruction and extension. The method comprises the following steps: 1, removing surface soil of a roadbed substrate tobe widened, and rolling the substrate after the surface soil is removed before filling; 2, laying geocells on the base, and manually scattering gravels in the geocells; 3, performing slope cutting onthe to-be-widened side of the old roadbed, excavating steps at the slope part from top to bottom, and after the steps are excavated, and laying steel-plastic grids at the roadbed along the step surfaces; and 4, performing layered filling on the roadbed to be widened, and arranging settlement observation points and horizontal displacement observation points in the roadbed filling process. With application of the roadbed splicing method, the new roadbed and the old roadbed are well connected, longitudinal cracks caused by differential settlement of the new roadbed and the old roadbed are avoided, and thus the construction quality of highway reconstruction and extension engineering projects is guaranteed, and the highway construction level of China can be improved.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to a roadbed splicing construction method in expressway reconstruction and expansion. Background technique [0002] Due to the constraints of technical conditions, economic level and social environment in the early construction, the expressway basically adopts two-way four-lane. With the rapid growth of social economy, traffic volume and other factors, the expressway built in the early stage can no longer meet the growing traffic volume. It is the trend of the times to rebuild and expand four-lane lanes into six or eight-lane lanes. In the projects that have been completed and opened to traffic, a considerable part of the subgrades are built on soft soil foundations, and the longitudinal cracks on the joint surface of the new and old subgrades have become important quality defects. This is mainly because in the process of reconstruction and expansion, there will inevitabl...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a roadbed splicing construction method in expressway reconstruction and expansion, which adopts the roadbed splicing technology The new and old subgrades are well connected, avoiding the quality defects caused by the uneven settlement of the old and new subgrades, thereby ensuring the construction quality of the expressway reconstruction and expansion project, which is conducive to improving the level of expressway construction in our country

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