This is not the usual style of pile installation that we would be doing in this situation, but due to terrible ground conditions where the holes were collapsing as we were drilling, it was decided that driven piles were the best option. as shown, we drop a 300kg hammer down the blanked pipe and ram it until the required set is reached. this was done in 1.2m increments with each section being welded. The final depth of the piles ending up being around 8m.
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