Jervis Forcemain Tunnel: Live Sewer Tie-in 300m Down a Tunnel

Description:Metro Vancouver built the Jervis Forcemain No. 2 between 2008 and 2011. It involves 2.6 km of new sewer, ranging from 900 mm diameter to 1800 mm diameter, built under four contracts. The fourth phase of the work included 300 m of 1800 mm diameter sewer pipe installed by tunnelling. The downstream connection was to the Eighth Avenue Interceptor, at a depth of 20 m below the road. Various tunnelling methods were identified as feasible, with the ultimate decision being left to the Contractor. A concept of the tie-in arrangement was provided in the tender documents, however the Contractor was free to suggest alternate configurations to suit their methodology. A live connection was safely completed and isolation maintained by building a junction chamber at the end of the tunnel. The paper describes the process required to develop the tie-in methodology and safely complete the work.

Authors: Meldrum, Colin ; Zimmer, Rob

Subjects: Wastewater, Safety

Tags:ac2012

Citation:2012 BCWWA Annual Conference, Session 16, Penticton

Publication Date:Jul 1st, 2012 Upload Date:Jul 1st, 2012

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