Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Oslo City: Deep Basement with Permanent Sheet Pile Walls. High Strength Concrete Piles
O. Bruskeland; Noteby Norsk teknisk byggekontroll A/S, Norway

The largest commercial building in Norway - the OSLO CITY - comprises total basement area of 28.000 m^2, including a six floor deep parking garage excavated in soft to medium clay, partly down to rock. This 17-23 m deep excavation is supported by a 6.000 m^2 sheet pile wall which also forms the permanent walls of the basement. Approx. 700 pcs of temporary back-anchors transferred the earth pressures to rock during the excavation phase. The project had strict requirements to limited deformations of adjacent property, which included several large buildings and a subway-station. Particular care was taken to avoid any permanent changes in the ground water conditions, and to limit the temporary effects as much as possible. The basement is undrained with the sheet piling made watertight by welding. The uplift is controlled by permanent rock-anchors in the base plate. The problem of corrosion is mainly taken care of by providing a generous steel thickness.

 article #489; publication #37 (IC-1991-IT)