Subgrade pile-plank type widening structure and construction method thereof

Abstract

The invention relates to a subgrade pile-plank type widening structure and a construction method thereof. A post-cast lapped segment is arranged between an old road roadbed and a late-connected roadbed, the lower portion of the post-cast lapped segment is provided with a cushion layer, a guiding hole recharge body is arranged under the cushion layer, the end portion of the guiding hole recharge body is provided with a steel reinforcement cage, and the lower end of the guiding hole recharge body is provided with a high pressure jet grouting pile; a pre-stress tube pile is arranged under the pavement of a late-connected segment, a slurry solid is arranged surrounding the pre-stress tube pile, the bottom of the pre-stress tube pile is provided with a prefabricated extension pile end, and high pressure grouting is formed surrounding the prefabricated extension pile end; and an original protection slope is excavated to form a construction platform, cellular concrete is used to realize multistep casting after construction of the construction platform is completed, casing soil is arranged on the cellular concrete, and greening vegetation is arranged on the casing soil. The structure and the construction method can guarantee the construction progress and the construction quality of the subgrade pile-plank type widening structure, guarantee the economy, the safety, the simplified construction process and land resource saving of the construction, and have good economic and technical benefits.

Description

technical field [0001] The invention relates to a subgrade pile width-gathering structure and a construction method, in particular to a roadbed pile-slab width-gathering structure and a construction method. Background technique [0002] With the continuous development of the economy, the continuous progress of the rural economy in recent years, and the continuous improvement of people's living standards, people's requirements for the quality of life are also getting higher and higher. Road traffic is one of the basic facilities for people's daily travel, in order to ensure that people travel more comfortably and conveniently. Many existing roads are restricted by the socio-economic level, technical level and construction concept at the time of construction, and a considerable part of them cannot meet the requirements of traffic growth and social development. The reconstruction and expansion of existing roads has become another solution besides new roads, and it occupies an ...

AI Technical Summary

Problems solved by technology

At the same time, during the roadbed widening construction process, the retaining wall of the original roadbed slope protection needs to be removed, which may cause landslides. At the same time, the new roadbed needs to be re-graded after the construction of the roadbed piles, which takes up a lot of land resources.

In the past, no treatment was done under the cushion layer under the new and old subgrade stages, and a single cushion layer may cause the cushion layer to slip

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