Abstract
The paper describes the new method developed for foundation strengthening by a drill and inject pile with controlled widening on its end. The method aims at increasing the useable area of the buildings under refurbishment. This is achieved by developing the underground space and/or adding floors. In-situ tests were carried out on a construction site in the city of Tyumen in order to implement the method on an industrial scale. The in-situ tests resulted in determining the radius of the compacted zone of soil massif, the geometric parameters of controlled widening, the vertical and horizontal deformations of the soil massif in the pile area and the changed physical and mechanical characteristics. The article describes the production of a new method for reinforcing foundations in the form of a drill-injected pile with controlled broadening at the end.
Highlights
Well-timed refurbishment of any building is very important for maintaining its life cycle
The process of pile shaft formation is similar to traditional drill and inject piling with lip technology in the mortar injection mode under a pressure of 2-4 MPa (20-40 atmospheres) when vertical or horizontal hydraulic fractures occur in clayey soil
The specially manufactured drill and inject pile was excavated in order to determine the changed physical and mechanical characteristics of the soil massif in the pile area
Summary
Well-timed refurbishment of any building is very important for maintaining its life cycle. The process of pile shaft formation is similar to traditional drill and inject piling with lip technology in the mortar injection mode under a pressure of 2-4 MPa (20-40 atmospheres) when vertical or horizontal hydraulic fractures occur in clayey soil. Such a method makes it possible to work in cramped conditions and is highly constructible. This method can reduce performance time for foundation strengthening and turnaround time for building refurbishment The method makes it possible to work with the minimum values of additional settlements due to «instant performance» of the pile during the process of widening (mortar injections into the membrane-shell); this makes the method different from the analogues ones
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