TBM breakthrough into a secant pile reception shaft. When a Tunnel Boring Machine (TBM) is scheduled to break through into a secant pile or diaphragm wall reception shaft, careful consideration must be given to the design and preparation of the shaft. A critical aspect is the incorporation of a soft eye in the shaft wall, which is an area with specific reinforcement arrangement to facilitate the TBM's arrival. This soft eye is engineered to withstand the pressures of tunnelling while allowing th

TBM breakthrough into a secant piling reception shaft. In tunnelling projects where a Tunnel Boring Machine (TBM) breakthrough occurs into a reception shaft supported by secant piling or Diaphragm walling, the inclusion of a soft eye within the structure facilitates a smoother breakthrough for the TBM. Secant piling provides structural support to the shaft by creating a continuous wall of interlocking piles, which helps to stabilise the surrounding soil or rock. The soft eye acts as a predetermi

🌟 New post is out now 🌟 🟩 Unlike the secant piling method, where piles overlap, tangent pile walls are constructed without overlap between piles. The piles are installed either flush against the adjacent pile or with a very small gap between them. Typically, all piles in a tangent wall are reinforced with steel cages or beams. This method can be used for the construction of retaining walls and shafts. We have covered all tunnel and shaft construction techniques in our Online Tunnel Engineerin