Design and construction of Sai Ying Pun station, Hong Kong

Completed in March 2015, Sai Ying Pun station is one of three large, new stations on the £1·3 billion West Island line project in Hong Kong. It is a massive, multi-disciplinary construction, with a 228 m long station cavern connected by way of a 1100 m network of passenger and ventilation adits to four entrance shafts up to 76 m deep. This paper focuses on the engineering design and construction challenges associated with delivering the monumental entrances, each of which is unique in its complexity. The entrances had to accommodate circulation and evacuation routes, plant, ventilation ducts, launch shafts and re-provisioning for original land use within a congested, steeply sloping urban environment. The relation of the entrances to the station and adit delivery, as well as the impact on existing buildings, is also discussed.