Tweet Share

• Send by email

  Send by email

  

  Tailskin Brushes replacement under difficult ground conditions - Three R ivers

  As part of the 3RPORT Project, an 8 km tunnel is being excavated underneath the three rivers of Fort Wayne using a 5.8 m diameter Slurry Tunnel Boring Machine. The groundwater pressure at the tunnel axis ranges from 4.5 to 5.3 bar. The rock mass hydraulic conductivity is very high with water inflows up to 630 l/s imposing significant challenges to the project. After excavating 470 m of the TBM tunnel, major leaks between through the tailskin and the segmental lining were observed, indicating the potential deterioration of the tailskin brushes and the need for inspection and eventual replacement. The first part of the paper describes the planning of the intervention, including the design of the Polyurethane grouting campaign, the procedures developed for the execution and the controls established during construction to timely assess the presence of potential hazards. The second part of the paper focuses on the experience gained during execution and lesson learned to prevent future occurrences of this nature.

  Recipient :

  Name ^* :

  E-mail address ^* :

  ^* Required fields

  Send   or  Cancel

• Print