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Concrete stacks are readily available in square, octagonal, and also round cross-sections. Steel heaps are either pipeline stacks or some type of beam area (like an H-pile). Driven stacks are likewise considered to be "checked" for weight-bearing capability because of their technique of setup; thus the slogan of the Heap Driving Specialists' Association is "A Driven Heap ... Click for more Is a Screened Stack!". Micropiles are an affordable alternative to big diameter pierced shaft structures, particularly in tough ground problems, karst geology, or restricted accessibility situations. They might be strengthened with a threaded bar to achieve the proper design lots capability.