Reinforcement structure for arch-covering-method underground excavation subway station arch feet and construction method

Abstract

The invention discloses a reinforcement structure for arch-covering-method underground excavation subway station arch feet and a construction method. The reinforcement structure for the arch feet comprises two layers of arch cover supports, arch foot piles distributed at the arch feet of the left and right sides of subway station arch cover bodies and arch foot longitudinal beams, the arch foot longitudinal beams and the arch foot piles are integrally connected, and pile bodies of the arch foot piles are distributed along the tangent line of the arch feet; each arch foot pile is composed of asection steel framework and fine aggregate concrete which is poured into the section steel framework and pile holes. The reinforcement structure is a reinforcement system combining the arch foot pileswith the longitudinal beams, the longitudinal beams are connected with the arch foot piles and the first and second layers of arch cover supports, the structural integrity is good, the capacity of resisting local stress and deformation is high, and deep and thick smashed surrounding rock at the arch feet can be effectively reinforced and protected; in addition, according to the construction method of the reinforcement structure for the arch feet, the reinforcement range and implementation objects are flexibly selected, rock layers of the arch feet for supporting arch covers are smashed, the integrity influence cannot be caused, and the advantages of an arch-cover method in the aspects such as project cost, construction working period, implementation efficiency and mechanical operation cannot be influenced.

Description

technical field [0001] The invention belongs to the technical field of rail transit construction, and relates to an arch foot reinforcement structure of a subway station, in particular to an arch foot reinforcement structure and a construction method located near the position of broken surrounding rock in the construction of an underground excavation subway station by the arch cover method. Background technique [0002] In view of my country's vast territory and obvious differences in soil and rock layers in different regions, with the extensive development of my country's subway projects, there are different implementation methods for underground excavation methods in different strata conditions, including "middle hole method", "side hole method", " PBA hole pile method" and "arch cover method", etc. [0003] The arch cover method is a kind of underground excavation construction method suitable for the surrounding rock "soft at the top and hard at the bottom". The scope of ...

AI Technical Summary

Problems solved by technology

Therefore, the current reinforcement methods inevitably have disadvantages such as low structural rigidity, uncontrollable effect, and difficulty in effectively covering deep and thick fractured layers in the reinforcement range.

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