KVAERNER CEMENTATION, in joint venture with Gammon Construction, has finished tunnelling on the £40M Central Western and Wanchai West Sewerage system in Hong Kong.
Working for the Hong Kong Drainage Service Department, the two firms built 41 tunnels between 1.2m and 1.8m diameter to depths of up to 16m between Kennedy Town and Wanchai.
More than 5km of tunnelling was carried out through difficult reclaimed ground using pipe jacking. Work was impeded by a variety of obstructions, including historic sea walls, piers and jetties, construction material and discarded washing machines. Dense surface traffic systems further complicated operations.
The new sewer system is due to be completed in the summer. The joint venture is now building two more tunnels for the Drainage Services Department linking Kwung Tong, Tokwawan and Stone Cutters Island. These are 3.5m diameter and stretch for 9km at depths of up to 150m. Work will finish next year.