Method and device for reinforcing underground continuous wall of shield tunneling under existing station

Abstract

This invention discloses a method and device for reinforcing the diaphragm wall of an existing railway station via a shield tunnel, relating to the technical field of tunnel construction methods. The reinforcement method includes constructing a working shaft on the outside of the existing station's diaphragm wall and clearing any obstructions from the working shaft; constructing at least one row of horizontal MJS piles into the soil beneath the station from within the working shaft along the predetermined path of the shield tunnel to be constructed; after the horizontal MJS piles are formed, horizontal holes are drilled around them; assembled prestressed anchor cables are pushed into the horizontal holes; high-pressure grouting is performed through the anchor cable's grouting pipe to form a grout body between the horizontal holes and the anchor cables; after the grout body reaches a predetermined strength, the anchor cables are tensioned in stages to a predetermined prestress value within the working shaft, and then locked using an anchoring structure. This invention effectively connects the horizontal reinforcement body to the existing retaining structure, significantly improving the overall stiffness and stability of the reinforcement system and providing multiple safety guarantees.

Images