collapse of borehole cast insitu pile

[sremotorway]

we are constructing a bridge having 36 nos 25m length and 1.2m dia cast in situ R.C.C piles.borehole of one pile after boring collapse.what will be remedial measure for it?

 

[dik]

Can you drill and sleeve it... reinforce it, and cast concrete, withdrawing the sleeve and letting the concrete fill in the collapsed material?

I usually vibrate the top 10' of a pile/caisson... might be prudent to vibrate a greater length...

Dik