Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)
10 The Deep Foundation of the Extension of the 'Nederlandsche Bank Building' in Amsterdam
H.J. Everts, E. Janse & J. Kruizinga; Delft Geotechnics, Delft, Netherlands
The article deals with the design, installation and monitoring of the piled foundation for the extension of the 'Nederlandsche Bank-building' in Amsterdam. The foundation aspects are directed by Delft Geotechniques in close co-operation with the structural designers 'D3BN consulting engineers'. The extension consists of a cylindrical shaped building with a height of 60 meters and a diameter of 27 meters, designed by the architects Abma, Dirks and Partners. The building is situated in an inner court-yard on top of an existing underground parking basement and adjacent to an existing building. The existing building and basement are founded on prefab concrete piles in the usual foundation layer at a depth of NAP - 17 meters. Due to the weight of the building, the presence of a 30 m thick clay layer underlying the usual foundation layer, together with the severe deformation criteria for the new and the existing building, the extension had to be founded on bored piles at a depth below NAP - 55 meters. Based on the results of finite element calculations it was decided to improve the shaft friction and base resistance of the pile below NAP - 55 meters by grouting. After installation of the pile the homogeneity of the shaft has been checked by nuclear density measurements. CPT's have been carried out from the bottom of the pile through tubes installed within the piles to find out the degree of disturbance due to the excavation and the effects of grouting underneath the pile tip. During construction of the building the settlements were recorded. From this settlement behavior it was concluded that the bored pile foundation is completely satisfactory.
|article #451; publication #37 (IC-1991-IT)|