Delivering the Best

Complex and multi-disciplinary projects delivered using innovative construction methods that push the boundaries of engineering excellence

Water & Waste Water

Project Details

Hong Kong Island Trunk Sewers


Hong Kong


Drainage Services Department, HKSAR Government

Contract Value

HK$500 million

Construction Period

1996 Q3 - 2000 Q3

Hong Kong has embarked on an ambitious programme to upgrade its sewerage system. As part of this programme, in joint venture with Cementation Skanska, we have built two new trunk sewers along the northern shoreline of Hong Kong Island. Located at depths of up to 18 metres below ground level, the sewers extended for a total length of 5.5km, ranged in diameter between 1.3 and 2.1 metres and were accessed by a total of 47 shafts. They ran generally through reclamation fill in heavily built-up areas, requiring a range of excavation techniques: Herrenknecht slurry TBM, Bessac shield with rotary cutter, segmental hand shield and open cut.

All construction works whether cut and cover, trenchless or shaft sinking were undertaken in a manner which controlled ground and ground water movement in order to minimise the impact on adjacent structures, roads and utilities.