Proceedings - Seventh International Conference & Exhibition on Piling and Deep Foundations, 1998, Vienna, Austria, (DFI)
Driven steel shell cast in situ piles: effect of deviation during driving
Angelo L. Garassino, Maurizio Nesti
Pile installations are sometimes of poor quality so that pile defects can be present. One of these defects is pile deviation that can be originated by many events. Attention is generally paid to avoid pile deviations when a crowded pile group with long piles has to be realized. Far less care is paid for small pile groups or insulated piles. When deviations are consistent checks are to be made for what concerns bearing capacity and additional stresses, particularly the latter could be not negligible and thus requiring the presence of the reinforcement cage even at great depths. The estimation of such parasite effects is difficult due to many unknowns, however rough calculations on the safe care cover the unexpected design lack on the matter. Evidences whether the problem is present or not can be collected on site during the pile installation phase. A good site inspection can thus reduce the risk of pile deviating by giving the opportunity to take remedial measures as soon as one can take the suspect that the problem is present.
|article #352; publication #34 (IC-1998)|