Construction method of widening high-fill subgrade with foam light soil

Abstract

The invention relates to a construction method for widening a high-fill roadbed with foam light soil, which is characterized in that the original old roadbed is first cut into a stepped shape, and a concrete baffle is arranged on the periphery of the widened side of the roadbed as a formwork for pouring foam light soil. The reinforcement mesh is laid horizontally at the position of the large platform to connect with the baffle, and prestressed anchor rods are added to anchor on the baffle, and the pouring construction of foam light soil is carried out by layering, partitioning and segmenting, and finally the baffle is removed and the hanging type is installed. Geotechnical bag: The construction method includes original subgrade construction, baffle installation, lightweight foam soil pouring, steel mesh and drainage pipe installation, anchor cable construction, lightweight foam soil pouring, steel support removal and installation of hanging geotechnical bags. According to the invention, baffles and pre-embedded section steel are provided on the widened side of high filling to form a stable support structure, which can effectively improve the stability of the baffle, and the section steel after construction can be recycled and used, reducing material loss and engineering cost.

Description

technical field [0001] The invention relates to widening construction of a high-fill embankment on a soft foundation with high requirements for post-construction settlement, in particular to a construction method for widening a high-fill embankment of foam light soil. Background technique [0002] The post-construction settlement caused by the widening of high-fill soft soil subgrade has always been a prominent problem. In the high-fill embankment project, if traditional materials (earth and rock) are used for filling, the required amount of earth and rock will be large, and the vertical additional stress will be large, which will have a great impact on post-construction settlement and easily cause road cracking and slope collapse; and construction The construction period is long, the embankment slope covers a large area, and the project cost is high; while the high filling project generally has the characteristics of tight construction period and large filling volume, it is...

AI Technical Summary

Problems solved by technology

In the high-fill embankment project, if traditional materials (earth and rock) are used for filling, the required amount of earth and rock will be large, and the vertical additional stress will be large, which will have a great impact on post-construction settlement and easily cause road cracking and slope collapse; and construction The construction period is long, the embankment slope covers a large area, and the project cost is high; while the high filling project generally has the characteristics of tight construction period and large filling volume, it is urgent to propose corresponding solutions

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