Pressure reducing horizontal reinforcing process for soft soil layer

Abstract

A horizontal reinforcing technology for decreasing the pressure to soft earth stratum includes such steps as construction preparation, horizontal drilling, and horizontally spinning and spraying the hardening grout for reinforcing the soft earth stratum. The drilling rod is swung by 180 deg. for cutting earth while the hardening grout and compressed air are sprayed out via respective nozzles. The high-pressure water is sprayed out at same time for draining the sludge in time.

Description

Technical field

[0001] The invention relates to a ground reinforcement technology for underground buildings, in particular to a horizontal reinforcement technology for soft soil layers. Background technique

[0002] At present, in the construction of urban tunnels, the rotary grouting method developed in accordance with the requirements for reinforcement of the excavation surface and the working conditions in the tunnel in urban tunnel engineering has been applied in Europe in the 1980s. In urban subway projects, there have also been many successful applications. For example, the Milan subway in Italy is used to excavate the side channel in the pilot tunnel to pre-form an arched horizontal rotary grouting reinforcement. In the Naples light rail construction, when the tunnel passes through the foundation of the building, In the tunnel face, an arched horizontal jet-grouting pile with steel pipes inserted into the tunnel is formed in advance to reinforce the solid.

[0003] Japan's...