Driven cast in-situ (DCIS) piles are constructed by driving a closed-ended thick-walled steel casing into the ground and then filling it with concrete.
The 25mm thick heavy steel tube is driven with the end closed by a steel shoe. On reaching the required driving resistance, a full length cage is lowered in to the tube and filled with high slump concrete. The tube is then vibrated out leaving a shaft of concrete. When supporting industrial or warehouse floor slabs, a monolithic 900mm diameter pile head can be cast to a precise level at the top of the pile, avoiding breaking piles down.
Keller UK has extensive experience with driven cast in-situ piles, evolving the technique to ensure that high quality standards are achieved at all times.
Driven cast in-situ piles are instrumented during the installation process to provide high quality records during the construction process. A robust testing schedule also demonstrates the high performance/quality standards achieved.