Installation of bored piles by a kelly-bar with or without a casing pipe (diameter 620mm, depth up to 31m)
Using of casing pipes is applied for drilling through unstable grounds to prevent caving of walls of a borehole.
Immersion of casing pipes should be done during a borehole drilling by means of a rotor and a rig. The rotor provides a column by swinging movement.
The rotor and the rig spin a casing pipe into the ground using the weight of the rig and a powerful winch.
Pulling of these casing pipes is made by means of a power applied by the winch through a system of polyspasts.
For a pile installation is required to use concrete with strength no less than class B15, W4-12. Concrete mix should be agile and has a cone slump 16-20cm at the fraction of applied chip 5-20mm.
Piles can be reinforced by a space frame made from armatures of periodic profiles (die-rolled section) not less than class AIII and if it’s required by rigid reinforcement. Pile reinforcing is made according to additional calculation.
This technology of bored piles installation by a kelly-bar with or without a casing pipe enables to install the following constructions:
“Slurry-type walls” structure is a frame filling and bearing structure, which enables to build underground structures close to existing buildings, as well as inside of operating premises.
Casing pipe enables the following:
Advantages of the technology:
Specifics of the technology: