What is the best pile drilling method in loose clay?
What is the best pile drilling method in loose clay?
(OP)
What is the best method of drilling tangent piles in loose clay which would ensure the bore stability?
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What is the best pile drilling method in loose clay?
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RE: What is the best pile drilling method in loose clay?
CFA is the most economical as it doesn’t require casing. A bored pile would in soft clay
RE: What is the best pile drilling method in loose clay?
RE: What is the best pile drilling method in loose clay?
RE: What is the best pile drilling method in loose clay?
Tangent piles touch, secant piles overlap.
RE: What is the best pile drilling method in loose clay?
@EireChch, yes, I meant soft clay, with 1-3 SPT blow counts. Did you mean a bored pile would collapse in soft clay? even with the use of bentonite slurry?
Actually we had a project of this nature and when the excavation was done, the quality was not good. I am posting some pictures and would ask for some insight into the reasons, the solutions and the possible rectifications of the quality issues.
RE: What is the best pile drilling method in loose clay?
RE: What is the best pile drilling method in loose clay?
RE: What is the best pile drilling method in loose clay?
RE: What is the best pile drilling method in loose clay?
Watch out for pile communication if you're going with a tangent wall.
All the best,
Mike
RE: What is the best pile drilling method in loose clay?
RE: What is the best pile drilling method in loose clay?
@Oldestguy, I wouldn't say the placement of the rig. Actually the kelly guide of both rig were removed for some reason. In my opinion, the issues in alignment were due to this. The architect was surely worried with the results, because he lost some space of the basement.
@Hokie66, I agree with you. But I want to know how can we have better results and what precautions are to be taken when pouring concrete in slurry?
@MadMike @BigHarvey, The communication between the piles is also an issue. When we install the temporary casing, it has to have a diameter more than the pile diameter. So, we actually cannot get a tangent pile if we install a guide casing, and if we do, as in our case, the casing cuts the adjacent piles and damages the reinforcement as well if we lose the verticality. We proposed a secant pile system, but the structural engineer didn't agree.
If the soil do not have a minimum 15KPa cohesion, even if we case the piles, when we remove the casing, will the soil be able to provide the lateral support?
@LRJ, I haven't seen anyone use driven piles as earth retaining structures.
RE: What is the best pile drilling method in loose clay?
f-d
ípapß gordo ainÆt no madre flaca!
RE: What is the best pile drilling method in loose clay?
If the clay shows less than 15 kPa of cohesion you can press statically concrete sheetpiles in the ground, it's commonly done in Bogota (Colombia).
You can also use CSM (Cutter Soil Mixing) and steel beams to construct a temporary retaining structure.