Structure and method for avoiding upward floating of underlying tunnel caused by river excavation

Abstract

The invention discloses a structure for avoiding upward floating of an underlying tunnel caused by river excavation. The structure comprises a prefabricated concrete anti-floating plate arranged above the underlying tunnel, a plurality of slurry bag belt anchor rods distributed on the two sides of the underlying tunnel are fixedly connected to the prefabricated concrete anti-floating plate, the anchoring sections of the slurry bag belt anchor rods extend into a soil body on the lower portion of the underlying tunnel, the slurry bag belt anchor rods comprise rod bodies, grouting pipes and slurry bags arranged on the anchoring sections of the rod bodies, one girdling section is arranged on each slurry bag every 2 m, and a load is arranged on the prefabricated concrete anti-floating plate. The invention further discloses a method for avoiding upward floating of the underlying tunnel. The method comprises the steps of (1), dividing a riverway into a plurality of construction sections; (2), producing the prefabricated concrete anti-floating plate; (3), excavating construction sections at intervals; (4), hoisting the prefabricated concrete anti-floating plate, and placing the temporary load; (5), arranging the slurry bag belt anchor rods; and (6), removing the temporary load, and introducing water into the riverway. The method can effectively avoid upward floating of the underlying tunnel caused by excavation of the upper riverway.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a structure and a method for avoiding the submerged tunnel from floating caused by excavation of a river. Background technique [0002] With the formation of urban rail transit network and the development of urban water environment construction, there are more and more cases where rivers pass through or are adjacent to existing subway tunnels. On the one hand, the excavation and unloading of the river channel releases the soil stress at the bottom of the river channel, and the bottom of the pit produces uplift deformation. At this time, the force on the upper part of the underlying tunnel is reduced, and the tunnel is subject to inevitable additional internal force and additional deformation. On the other hand, with the excavation of the channel, the height difference between the inside and outside of the channel increases continuously, causing the surrounding soil to d...

AI Technical Summary

Problems solved by technology

However, the process of large-area foundation reinforcement and uplift pile construction has often had a great impact on the existing underlying tunnel, and the construction speed is relatively slow, the economy is relatively poor, and at the same time it will affect the soil and water quality around the river. cause mud pollution

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