A construction method for highway embankment widening structure

Abstract

The invention relates to a construction method for a highway embankment widening structure. The original roadbed side slope of the structure is trimmed into a step shape, a high-pressure rotary grouting pile is arranged under the original roadbed side slope cushion, and pressurized continuous grouting is adopted at the original roadbed cushion A slurry-solid bearing plate is formed, and the cavity of the original subgrade is refilled with fine stone concrete or mortar; foundation treatment piles are used to reinforce and widen the foundation in the area, and the top of the foundation treatment pile is paved with a drainage cushion; the upper part of the drainage cushion is laid with geotextiles, geotextiles A cement-soil slab is placed on top, and a high-strength steel mesh is set in the cement-soil slab; the embankment in the widened area is formed by layered filling of excavated soil and lightweight filler during construction. The invention can enhance the bearing capacity of the subgrade soil on both sides of the widened area and the strength of the original subgrade slope, improve the integrity of the embankment structure, reduce the generation of longitudinal cracks at the junction of the old and new subgrades due to differential settlement, etc., and has better technical and economical advantages benefit.

Description

technical field [0001] The invention relates to a novel highway embankment widening structure and construction method which can simultaneously improve the bearing capacity and integrity of the old and new roadbeds in the widened area, and reduce longitudinal cracks at the junction of the old and new roadbeds due to differential settlement. Belonging to the field of highway engineering, it is suitable for single-sided or double-sided highway widening projects in old road reconstruction and expansion projects, especially for highway reconstruction and expansion projects in soft soil areas. Background technique [0002] In recent years, with the rapid development of our country's economy, the traffic volume of highways has increased year by year, and the traffic volume of some highways is close to saturated traffic volume. In this regard, in order to meet the growing traffic demand and social development needs, there are more and more highway reconstruction and expansion projec...

AI Technical Summary

Problems solved by technology

However, the method fails to realize the lateral reinforcement of the embankment structure and the deep transfer of the upper load, and the control effect on differential settlement is limited

[0005] In summary, although there are some measures that can be used to solve the problem of differential settlement in the widening area of ​​the old road, the combined application of various measures is of positive significance for controlling the differential deformation of the embankment in the later stage and enhancing the integrity of the junction of the old and new embankments. However, the existing measures are mainly aimed at newly-filled embankments, and there are few designs involving the improvement of the bearing capacity of old embankments. It is difficult to apply to road sections with high embankment filling heights and high requirements for differential settlement control.

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