System for dewatering boreholes by means of alternative cycles of vacuum and exhaust, based on the principle of pneumatic displacement

摘要

A system of de-watering boreholes by alternating cycles of aspiration and expulsion based on pneumatic displacement, includes a double hose to be introduced into a borehole. The double hose includes a flexible outer hose and a flexible inner hose separated by an annular space therebetween, the double hose adapted to reach a full depth of the borehole. The outer hose has an outer diameter less than a diameter of the borehole to provide an annular clearance between the borehole and the outer hose. An upper closing element is connected to an upper end of the double hose outside of the borehole, and has two outlets which permit entry and exit of air and water. A lower closing element is attached to the double hose at a lower end thereof, and includes a foot valve, a filter, and a protective element to serve as a battering ram.