E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
E02F 3/20 (2006.01) E02F 3/22 (2006.01) E02F 3/18 (2006.01)
Patent
CA 2403182
The invention concerns an apparatus for drilling trenches (42) in the ground comprising a frame (14), a drilling assembly comprising a horizontal support plate (18) connected to the lower end of the frame, said plate supporting drilling tools (24, 26) arranged beneath said plate, said trench being filled with drilling mud. The plate (18) comprises at its periphery elastic sealing means (44) to produce at least partial tightness between said plate and the trench walls and means (40, 46', 48') to regulate the flow rates of the drilling mud from the part of the trench arranged above said plate towards the part of the trench beneath said plate and in the opposite direction, so that the pressure of the drilling mud beneath said plate is much less than the hydrostatic pressure exerted by the column of drilling mud in the trench above said plate, and the flow rate of the drilling mud extracted from the part of the trench beneath said plate is sufficient to enable removal of debris.
L'invention concerne un appareil de forage de tranchées (42) dans le sol comprenant un châssis (14), un ensemble de forage comportant une plaque support (18) horizontale reliée à l'extrémité inférieure du châssis, ladite plaque supportant des outils de forage (24, 26) disposés sous ladite plaque, ladite tranchée étant remplie d'une boue de forage. La plaque (18) comporte à sa périphérie des moyens élastiques d'étanchéité (44) afin de réaliser une étanchéité au moins partielle entre ladite plaque et les parois de la tranchée et des moyens (40, 46', 48') pour régler des débits de boue de forage de la partie de la tranchée disposée au-dessus de ladite plaque vers la partie de la tranchée en dessous de ladite plaque et dans le sens inverse, de telle manière que la pression de la boue de forage en dessous de ladite plaque soit très inférieure à la pression hydrostatique exercée par la colonne de boue de forage dans la tranchée au-dessus de ladite plaque, et que le débit de boue de forage extraite de la partie de la tranchée en dessous de ladite plaque soit suffisant pour permettre l'extraction des débris.
Deniau Alain
Gessay Jean-Claude
Compagnie Du Sol
Sim & Mcburney
LandOfFree
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