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Steel pipe stacks, which are most piling contractors north west typical, are easy to drive and also can be used as long-term piles in smaller sized diameters and also as temporary caisson or casement for big sizes. Steel heaps are favored as end-bearing stacks due to their capability to be driven in deep strata because of tiny cross-sectional area, lessening dirt resistance. Another aspect is their weldability to offer longer expansions when required. By taking out the steel case, a bond zone is developed between the bordering bedrock or soil and also the cementitious grout.