Roadbed filling method for reconstruction and extension of road in road area limited section

Abstract

The invention discloses a roadbed filling method for road area limited section road reconstruction and expansion, which comprises the following steps: carrying out step digging treatment on an old roadbed slope to be reconstructed so as to form a step surface, and connecting a new roadbed with the old roadbed through the step surface; a concrete baffle is installed on the outer side of the old roadbed, a pouring area is formed between the concrete baffle and a slope of the old roadbed, and the concrete baffle is made of construction waste recycled aggregate concrete; the pouring area is filled with bubble mixed light soil in a pumping mode, and a new roadbed is formed after the bubble mixed light soil is solidified; a layer of HDPE anti-seepage geotextile is laid on the bottom foundation of the pouring area, and a layer of HDPE anti-seepage geotextile is also laid on the uppermost layer of the bubble mixed light soil. The method is particularly suitable for roadbed filling of road reconstruction and extension projects when the road area width is limited, the volume weight of the bubble mixed light soil is extremely small, and most of the bubble mixed light soil is lighter than water, so that the additional load of the foundation is greatly reduced, and the treatment difficulty of the original foundation is reduced.

Description

technical field [0001] The invention relates to the technical field of road expansion, in particular to a roadbed filling method for reconstruction and expansion of a limited section of road. Background technique [0002] With the rapid increase of my country's traffic volume and the continuous changes in road network functions and social needs, the traffic capacity of some early-built roads is difficult to meet the requirements, and the traffic volume reaches saturation or even oversaturation, which seriously affects the service level of roads and traffic safety. Therefore, expanding road traffic volume and improving road traffic conditions are important issues that need to be solved urgently at present. [0003] Due to the large investment scale of road network densification and new double-track construction, demolition costs account for a large proportion of construction costs, attracting limited traffic volume, and its investment returns are not high; while old roads can...

AI Technical Summary

Problems solved by technology

On the one hand, the cost of land acquisition and demolition will be greatly increased due to the requirements of grading, on the other hand, in areas with dense building groups or routes close to gullies, road expansion will encounter great resistance

Images