where we use under reamed pile :
- Underreamed piles are used in espansive soil.
- These pile are researched by RORKEE CBRI (central building research institute in INDIA).
- These type of pile transfer the building load at a depth through the pile beyond the seasonal zone variation in moisture content.
- Depth is kept about 3.65 meter for black cotten soil.
- Under reamed pile are bored cast in situ piles and have a base like bulb.
- The spacing of piles is kept 1.5 meter to 3.0 meter
- These piles are connected by the plinth beam at the top. plinth beam is a reinforced concrete beam.
- Reinforced is also provided in the uunderreamed pile to absorb the tensile forces which are developed during the swelling of soil and these forces are commonly called uplift force.
- The other big advantage of providing reinforcemnt in underreamed pile is that during the hot weather soil shrinks and pile acts as column.
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