Innovative One-pass Lining Solution for Doha’s Deep Tunnel Sewer System
Large diameter sewer tunnels can be built with either a two-pass or one-pass lining to protect the structural concrete from aggressive sewer gases, thereby lowering a tunnel’s maintenance needs and extending its life cycle. The use of a one-pass lining can reduce the construction schedule, save capital costs and improve overall quality. A one-pass lining solution is being applied for the first time in the Middle East on the main trunk sewer of the Inner Doha Re-sewerage Implementation Strategy (IDRIS), a programme developed by the Public Works Authority (Ashghal) in the State of Qatar. CH2M is the Programme Management Consultant, with the tunnel designed and constructed by Bouygues Travaux Publics and Urbacon Trading & Contracting Joint Venture. This paper presents the implementation process and main challenges during the design and development of the lining.