[DOC] GUIDE TO DRAFTING A SPECIFICATION FOR HIGH CAPACITY ...
Casing: Steel pipe introduced during the drilling process to temporarily stabilize ... Core Steel: Reinforcing bars or pipes used to strengthen or stiffen the pile, ... None provided tension load on casing is less than 20% of casing thread strength ... be lowered into the stabilized drill holes to the desired depth without difficulty.
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ismicropiles's website is ismicropiles.org