Building Construction
The additional piles which are driven to increase the capacity of supporting loads on vertical piles, are known

Eccentric piles
Sinking piles
Raking piles
Construction piles

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Building Construction
Auger boring

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

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Building Construction
Rotary drilling

All listed here
Is not suitable for deposits containing very coarse gravel
Hinders the ground water observations and permeability test
Is not economical for holes of less than 10 cm

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