Pile Foundation and It's Types | Bridge Engineering | Lec - 05 

Something to think about when discussing the apartment collapse in Florida this week 🤔

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Bored cast in situ piles can transfer the loads through end bearing and skin friction both.

So bored piles are classified, based on the load transfer method, as friction cum end bearing piles? I suppose it can resist these two load types simultaneously. Not one at a time? Also, when we say a pile is resisting load through friction, does that mean it moves or that it tries to move? How can skin friction be involved anyway if, in bored piling, the pile's tip rests beneath or over hard strata? Isn't it strong enough?

If the water table is high, Bentonite slurry or Polymer slurry is used to improve the stability of the borehole during boring of pile foundation. After completion of boring insert reinforcement as per drawing and BBS, then employ tremie pipes to pour concrete through water. Attach the required number of tremie pipes to reach the bottom of the pile and attach the top hopper in which concrete to be poured. Provisions should be taken to ensure that underwater concrete is not dropped freely through water because concrete components are apt to become segregated and deposited as separate gravel, sand, and cement strata. Place concrete continuously to avoid disruption of concrete placement and the bottom of tremie pipe should embedded minimum 1.0 m into poured concrete while removing the tremie. The calculations of tremie pipes and pouring of concrete we will discuss in our next videos accordingly. Stay Connected…

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