The technology development of the widened base formation for bored piles

Abstract

Bored piles are used at the high concentrated vertical and horizontal loads in the construction sites with complicated geological and engineering conditions. They are support elements, which transfer and distribute the load from buildings to hard layers of soil. Technology of the bored piles making is drilling of bore in soil and placement of concrete mix into the bore.

The main advantages of bored piles are that no need to store a large number of prefabricated piles at the construction sites, high load-bearing capacity and efficiency at the implementation. Moreover, the most important advantage of bored piles, as compared with the prefabricated piles, is absence of dynamic and noise load on nearby buildings during execution of construction works. However, we have to stress a disadvantage of the technology of the bored piles making, which is the need of the bore drilling and the widened base formation to increase of the load capacity of bored pile. The aim of the research work is to improve the technology of the bored piles making by developing the equipment for the widened base formation. We propose a new equipment to form the widened base, protected by a Patent of the Republic of Belarus No.1823. The detailed description of design and principle of operation of the new equipment, as well as comparison with existing analogues are given in the research work. The use of the new equipment allows reducing labor expenditures and cost of the widened base formation for bored piles.

Keywords: Bored piles, Widened base, Barrel, Blade, Soil