Soilmec S.p.a.

Trevi S.p.a.

Daniele Vanni

Ezio Biserna

The helical drill bit defines a helical end section of a helical structure formed at its periphery by an auger of an excavation assembly, and it is associated or associable with a support portion of the auger. Such a support portion defines a proximal section of the helical structure, which has an extension substantially centered around a longitudinal axis (X-X). The helical drill bit is adapted to rotate about the longitudinal axis (X-X) together with the support portion so as to drill a hole in the ground. The helical end section extends around an extremity axis (Y-Y; &#x3a8;-&#x3a8;) that is not aligned relative to the longitudinal axis (X-X).

Helical drill bit for an auger of a ground excavation assembly, in particular for building excavated piles, and drilling method that uses such a bit

An object of the present invention is to provide methods for laying a waterproofing layer which may be used for forming the bottom and the walls of depositing sites so as to comply, both in literal and in substantial terms, with the legal requirements. The aim is also to provide durable waterproof barriers which have a high mechanical strength, without discontinuity.

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Cesena, Italy

Daniele Vanni