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Concrete piles are available in square, octagonal, and also round cross-sections. Steel stacks are either pipe heaps or some sort of light beam section (like an H-pile). Driven piles are also thought about to be "evaluated" for weight-bearing Click here for more capacity as a result of their approach of setup; thus the adage of the Stack Driving Specialists' Association is "A Driven Stack ... Is a Tested Heap!". Micropiles are a cost-effective option to big diameter drilled shaft structures, specifically in hard ground problems, karst geology, or limited access scenarios. They may be strengthened with a threaded bar to achieve the proper layout tons capability.