A kind of highway widened roadbed structure and construction method thereof

Abstract

The invention discloses a highway widened subgrade structure, comprising an original subgrade, the slope of the original subgrade is provided with a number of steps, fixed piles are arranged longitudinally on the upper part of the steps, and connecting components are arranged between the fixed piles; A new roadbed is arranged on the top surface of the fixed pile, and the new roadbed is fixedly connected with the original roadbed; a filler layer is arranged between the new roadbed and the original roadbed, and the filler layer is fixedly connected with the fixed pile. The highway widened subgrade structure and the construction method thereof provided by the invention are simple in construction and high in construction efficiency, and the original subgrade and the new subgrade are effectively combined through fixed piles, connecting components and reinforcing layers, thereby reducing the occurrence of occurrences between the new subgrade and the original subgrade. The probability of sideslip is reduced, and the new roadbed instability, road surface damage, uneven settlement at the junction of the new and old roadbeds, and overall performance decline in the widened expressway are reduced. It has important theoretical significance and practical value.

Description

technical field [0001] The invention relates to the technical field of highway construction, in particular to a novel highway widened roadbed structure and a construction method thereof. Background technique [0002] With the development of the national economy, the number of automobiles has increased significantly, and the road passenger and freight transportation has continued to grow rapidly, causing traffic congestion and even causing serious traffic accidents. It is urgent to expand the road capacity. Compared with the road network densification and the construction of new highways in close proximity, the expansion and reconstruction of old roads requires less land occupation and demolition, and the project investment is relatively small. Therefore, from the perspective of long-term development and economic benefits, the expansion and widening of expressways will be a period of time. During this period, my country's highway construction is an urgent and important problem...

AI Technical Summary

Problems solved by technology

[0003] However, according to the survey results, many widening projects have poor treatment effects, and it is difficult to effectively control the differential settlement of the old and new subgrades. Serious defects such as longitudinal cracks in the pavement

In addition, the southern region of my country is humid, hot and rainy, and the heat and humidity exchange between the subgrade soil and the air is frequent, which leads to the obvious attenuation of the performance of the subgrade and pavement in a short period of time. In addition, the high liquid limit soil and other special soils are widely distributed in the southern region, which makes the expressway improvement. The implementation of the expansion project in southern my country is facing greater technical difficulty and risk challenges

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