Right-angle turning method for small-diameter TBM exploration adit excavation

Abstract

The present invention discloses a right-angle turning method for small-diameter TBM exploration adit excavation and belongs to the field of geological exploration of water conservancy and hydropower projects. The method includes the steps: excavating a main exploration adit with a small-diameter TBM to a designated position, and then enabling the small-diameter TBM to continue to excavate forward to a temporary parking place, and parking the small-diameter TBM there; expanding and excavating a turning workspace at a right-angle turning position, and assembling a rotary platform; pulling the TBM onto the rotary platform, then starting excavation after rotating the rotary platform to make the TBM move in a same direction as the branch exploration adit; and pulling the TBM onto the rotary platform after excavation of the branch exploration adit is completed, and then moving the TBM to an adit portal so as to complete excavation after rotating the rotary platform to make the TBM move in a same direction as the main exploration adit. The present invention effectively solves the problems that the small-diameter TBM can only excavate main exploration adits in geological exploration adits of underground powerhouses of hydropower projects and pumped storage projects, and cannot make right-angle turns and excavate branch adits of underground cavern groups. It effectively fills the blank of a traditional adit excavation adopting blasting technology; and the excavation efficiency is high, the working environment is friendly, and safety production is guaranteed.

Dependencies are inferred from the claim text.