Boroinjection piles are made by the method of gradually rotating immersion of a hollow auger into the ground to the design depth, followed by injection of the concrete mixture into the well through the hollow auger and gradual removal of the auger from the well.
This technology has other names, for example, CFA (Continuous Flight Auger). And now in simple words: An auger welded to a pipe, like a big drill, is bored into the soil, and then concrete is fed through this pipe. Not just doubled, but with the help of a concrete pump. This concrete pump delivers concrete under high pressure through rubber, reinforced hoses – concrete pipes.
The drilling rig and the concrete pump work synchronously and under the control of a special computer that monitors the concrete pressure, the drilling depth, the number of revolutions of the auger and many other parameters.Thanks to the synchronization of the work of the drilling rig and the concrete pump, it is possible to fill the well with the required amount of concrete mixture. After concreting the well, a frame is immersed in fresh concrete, usually a reinforcing cage for pile, but it is also possible to have I-beams and reinforcement with separate rods, and sometimes without reinforcement at all. This work is performed by a drilling rig and an excavator. Also, the excavator performs many auxiliary functions, such as the selection of soil drilled from the well, moving concrete pipes, feeding the frame, etc. That is, three mechanisms are required for the execution of a complex of works on the installation of injection piles – a drilling rig, a concrete pump and an excavator.In skillful hands, under the guidance of an experienced engineer, the technology of drilling injection piles becomes high-quality, fast and economical among all other pile installation technologies.