Building Construction
In grillage foundations, distance between flanges of grillage beams, is kept

40 cm
Maximum of (A), (B) and (C)
Equal to flange width
Twice the flange width

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Building Construction
Auger boring

All of these
Is most economical up-to a depth of 5 meters
Is the most primitive method for making a hole in the ground
Is generally employed in cohesive and other self soils above water table

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