CPCS A47 A48 Piling Rig - Bored Practice Questions - CPCS A47 A48 Piling Rig - Bored (NOCN CPCS, UK) Exam

Why must the bottom cap (bung or flap) of a CFA auger open cleanly when concrete pumping commences?

To allow pressurized concrete to flow out of the stem and seal the base of the bore against soil collapse To allow ground water to enter the auger stem and dilute the concrete mix To lock the auger flights against the surrounding soil during rotation To release hydraulic oil from the Kelly bar into the bore hole

Correct Answer:

To allow pressurized concrete to flow out of the stem and seal the base of the bore against soil collapse

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