plumb

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Besides, according to factors (d) and (f), because of possessing long length above the ground, long piles have more energy consumption and difficulty in keeping plumbness than short piles in sinking process, and both of them will reduce the penetration rate of long piles.
"This means we must work within extraordinarily tight tolerances that take into account movement and shifting of formwork, shrinkage, creeping, and deflection of the concrete, and we must constantly monitor for true and plumbness of the columns and slab edge.
For example, the uncertainties of the fitted coefficients of the cylinder centerline are needed to check, with a given confidence, if two pipes are parallel or to check the plumbness of a cylinder column.