Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)
Steel pipe pile foundations for large structures in difficult soil conditions
J. Hartikainen & J. Heinonen
This paper is based on the experiences obtained in the piling work at the longest bridge in Finland, where the pile driving was carried out with two pile driving hammers, which work in basically different ways. One of the compared piling hammers is Finnish Junttan HHS-16 and the other is Dutch Hydrohammer IHC-S-70. To ensure the total safety level of the bridge the bearing capacity of the pile foundations, which govern the geotechnical failure, shall be checked very carefully. Also the ability of the piling hammers to reach the required pile bearing capacity shall be verified. Usually such checking can be done by the means of dynamic loading of working piles. In the ultimate circumstances pile driving is not a straightforward work. In situations, where unfavorable behavior of driven piles is more or less expected from the basis of the ground investigations, difficulties may occur e.g. in the form of boulders in moraine which can cause bending of the pile. An inclined bedrock surface under a thin moraine layer may cause sliding of the pile tip during the pile driving too. These unexpected situations shall be considered and controlled at a very early stage before they grow into an obstacle to the whole building work.
|article #800; publication #36 (IC-1994)|