Building Construction
The depth of concrete bed of the foundation depends upon

The mix of the concrete
The upward soil pressure
All listed here
The projection of the concrete block beyond the footing over it

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Building Construction
Grillage foundation

All listed here
Does not require deep cutting as the required base area with required pressure intensity is obtained at a shallow depth
Is used to transfer heavy structural loads from steel columns to a soil having low bearing capacity
Is light and economical

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