Permeation grouting (for ground improvement)
MINIJET Tecsoil

TecSoil Srl of Noceto (PR) has patented an innovative injection technique called MiniJet that offers the possibility to reduce the operative phases, typical of the Jet Grouting technology applied to the realization of anchor-rods and/or reinforced micro-piles, thus optimizing productivity.

This technique foresees the use of a perforation/injection system instead of the usual jetting equipment, made up of:

Sacrificial drill bit with no. 2 nozzles for the high pressure cement grout injection.
Sacrificial steel hollow rods/rebar (DN est. 32 - 38 - 51 - 76 mm) with improved adherence through continuous threading along the entire exterior surface.
Rebar/rebar couplers with no. 2 high pressures seals.
Multiple uses high pressure swivel head.
The point of strength of the MiniJet system, tested to be used with injection pressures up to 400 Bar, consists of its simplicity of use. This allows to operate with small sizes equipment also in very difficult conditions such as city ones, ensuring good technical result and considerable productions as the ones of the traditional jet-grouting job sites.

With the "MiniJet" technology, the activity is from the ground surface to the bottom of the hole (In case of a vertical column) and takes places contemporaneously with the drilling and the injection phases; in this way is created a jet-grouting column starting from the natural surface level until the final project's level (Jetting-in).
The diameters of the columnar elements can vary from 0.3 to 0.6 m according to the specific need of the work and according to the type of ground on-site.

In addition to the unquestionable advantage to reduce working times, the MiniJet technique is particularly reliable since the over-pressures that can be formed through the use of the traditional jet-grouting technique are reduced; as a consequence, there is also a considerable reduction of the quantity of spoil materials and lastly but very importantly, the perforation/injection equipment is left in the ground, thus constituting the steel reinforcement of the consolidated ground column ("Lost in the hole").

Thanks to the external shape of the "MiniJet rebars" with improved adherence and thanks to the use of high resistance steel, the reinforcement thus realized can be easily used as passive or active anchor.