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Cọc ống PC & PHC


FORMULA FOR AXIAL LOAD

Based on BS 8004: 1986 the maximum allowable axial stress that may be applied to a acting as a short struct should be one quarter of (Specified works cube strength at 28 day less the prestress after losses)

           Na = σcaA

                = cu - σce)A

                = cu - σce)A

Where, Na = Permissible axial load (N)

           σca  = Permissible compressive stress in concrete (N/nm2)

           σcu  = Specified compressive strength of concrete (N/nm2)

           σce  = Cross section area of concrete (mm2)

           n    = Factor of safety

FORMULA FOR PILE DRIVING

Kreuger Pile Driving Formula:

           P    =  

Where, P    = Static ultimate bearing capacity of pile

           H    = Effective height of free fall of ram

           Q    = Weight of hammer ram

           q    = Weight of pile

           E    = Temporary compression of Helmet (el), Pile (e2), and Soil (e3)

           S    = Set of pile per blow