Steel sleeve grouting reinforcement device for settlement control over shield tunnel of soft foundation

Abstract

The invention discloses a steel sleeve grouting reinforcement device for settlement control over a shield tunnel of a soft foundation. A duct piece of the shield tunnel is buried in the soil, a grouting device is arranged in the duct piece of the shield tunnel, one end of a steel sleeve formed by connecting a plurality of TAM units in series is perpendicularly buried in the soil, a pile toe is installed at the bottom end of the steel sleeve, the upper end of the steel sleeve penetrates through a grouting hole in the duct piece of the shield tunnel and is connected with an adapting piece, the adapting piece is fixed to the inner wall of the duct piece of the shield tunnel, one end of a grouting pipe is connected with the grouting device, and the other end of the grouting pipe is inserted into the steel sleeve. The steel sleeve is pressed into the soil below the tunnel through the grouting hole in the duct piece of the shield tunnel, grouting can be carried out on the surrounding soil at any burial depth through the TAM units on the steel sleeve, then a grouting area is formed around the steel sleeve, the steel sleeve and the grouting area can be treated as one mini-type pile at the moment, the mini-type pile is connected with the duct piece of the shield tunnel through the adapting pieces, and the aims of reinforcing the shield tunnel and controlling the settlement of the duct piece of the shield tunnel are achieved.

Description

technical field

[0001] The invention relates to a reinforcement device for a shield tunnel, in particular to a grouting reinforcement device for a steel casing for controlling settlement of a shield tunnel on a soft soil foundation. Background technique

[0002] For tunnels in saturated soft clay, since the reaction force of the soil at the bottom of the tunnel is always lower than the self-weight stress of the soil before the tunnel is built, the compressive modulus of the soil under the tunnel is lower than that before the tunnel is built, and the disturbed soil under the tunnel The long-term secondary consolidation of the layer continues slowly when the surface is loaded, so the development of long-term subsidence is often not negligible. The subway tunnels built in Shanghai, Hangzhou and other places have experienced large cumulative settlement and uneven settlement so far, which has affected the normal use and safe operation of the tunnels. Therefore, it is very necess...

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