Klohn Crippen Berger (KCB) was retained by Port Metro Vancouver in early 2005 as prime consultant to carry out detailed engineering and contract administration for the Deltaport Berth 3 Extension project in Delta, British Columbia, Canada. This project follows up on our successful 1993 design for Berths 1 and 2 and land-side terminal works at Deltaport Container Terminal, which won the Consulting Engineers of British Columbia award of excellence in 1997.
The Berth 3 marine works project comprises a 430 m extension of the existing 670 m long Deltaport Wharf, including significant dredging and reclamation works to form the 22 hectare container terminal expansion, a new tug basin facility with temporary barge ramp, plus environmental habitat compensation features for 2.5 km along the approach causeway. The 3-berth extended wharf is designed to accept containerships up to 12,000 TEU (twenty-foot equivalent unit), serviced by 10 ultra-modern gantry cranes.
The design of modern container terminals requires integration of a wide range of engineering disciplines with sensitivity to terminal operations, other stakeholders and environmental requirements. The Berth 3 extension is no exception. KCB provided an integrated, multidisciplinary engineering team to address all aspects of the civil engineering for this important waterfront development.
The Berth 3 wharf extension comprises ten slip-formed concrete caissons each 42 m long, with a sheet-piled bulkhead as the end closure wall. This location is seismically active and the design criteria included a 475-year earthquake event. Soil conditions are difficult, so the caissons are founded on a 14 m thick imported rock mattress, improved by underwater vibro-densification to assure foundation strength. After being floated into place, the precast caissons are ballasted and backfilled with berm rock and general fill. The backfill is then vibro-densified to enhance seismic stability and minimize apron settlements. In addition to the geotechnical and structural engineering, our team designed the fendering and mooring system, cope wall, crane rails, apron utilities, paving and scour protection.
Construction started in early 2007, with perimeter dike formation and dredging for reclamation fills being the priority tasks. Dredging was carried out with a specially adapted suction dredge to a depth of 35 m below high water. Field services during wharf construction include contract administration and inspection of all aspects of the work. Wharf construction was completed in September 2009.