To install a pile you should drill a borehole of a specified diameter and depth. Next the borehole should be filled by fine-aggregated concrete and reinforced with a metal frame of a required cut. So, the bored piles are installed and concreted directly on a site. The diameter varies up to 1500mm and depth - up to 10m or 30 m and more. To increase bearing capacity the piles should be installed with a widening at the bottom of the borehole (a foot of pile). Mostly such types of bored piles are used in situations when there are heavy loads to a foundation and the few compressible soils are deep-seated.
The installation of bored piles is free of dynamic effects to soils and foundations of existing buildings. This main advantage of bored piles is more appreciable during a construction within the urban zone. Moreover this type of foundations allows installing of a pile in any soil; even there are construction waste, remains from the previous structures and boulder and cobble deposits.
Quality control is very important during installation of bored piles. All rigs are equipped with a special computer system to control a pile concreting process. The monitoring piles’ parameters are depth, pressure of concrete mix, concrete volume and shape of piles.
CFA technology (diameter 600mm/450mm, depth up to 28m)
Full displacement piles (FDP) without soils excavation (diameter 410mm, depth up to 20m)
Installation of bored piles by a kelly-bar with or without a casing pipe (diameter 620mm, depth up to 31m)