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Concrete stacks are offered in square, octagonal, and also round cross-sections. Steel stacks are either pipeline piles or some type of light beam area (like an H-pile). Driven heaps are also taken into consideration to be "examined" for weight-bearing ability due to their approach of installment; hence the motto of the Stack Driving Specialists' Organization is "A Driven Heap ... Is a Screened Heap!". Micropiles are an affordable alternative to big size drilled shaft structures, specifically in difficult ground problems, karst geology, or limited gain access to situations. They may be reinforced with a threaded bar to acquire the piling companies in lancashire proper style lots ability.