Soil-displacing screw auger and method for making a concrete...

E - Fixed Constructions – 02 – D

Patent

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Details

E02D 5/56 (2006.01) E02D 5/36 (2006.01) E02D 7/22 (2006.01) E21B 10/44 (2006.01)

Patent

CA 2223764

. Soil-displacing screw auger which contains an auger tube (1); a double displacement body (2) equipped with a hollow shaft (8) fixed to the auger tube (1) and containing an upper part (6) which constitutes a closed screw the radius of which increases towards its lower extremity and a lower part (7) which constitutes a closed screw the radius of which decreases towards its lower extremity, preferably with the same pitch as the upper part (6); a lower tube the diameter of which is smaller than twice the largest radius (R2) of the displacement body and which is situated between the lower part (7) of the displacement body (2) and the lower extremity of the auger; a screw blade (4) welded onto the outer casing of the lower tube, which rotates in the same sense as the lower part (7) of the displacement body (2) and an auger tip (5) connected to the lower extremity of the lower tube, with the special characteristic that the lower tube of he auger is an intermediate tube (3) with an outer diameter (D3) which is smaller than twice the largest radius (R2) of the displacement body (2) but larger than the outer diameter (D1) of the auger tube (1), whereas the auger tip (5) contains a displacement part (16) with a closed screw rotating in the same sense as the screw blade (4) on the intermediate tube (3) and a maximal radius equalling half the diameter (D3) of the intermediate tube (3).

Le présent brevet vise une tarière hélicoïdale à déplacement constituée d'un tube tarière (1); d'un composant à double déplacement (2) réunissant un arbre creux (8) fixé au tube tarière (1), un segment supérieur (6) formant une vis fermée dont le rayon augmente à son extrémité inférieure et un segment inférieur (7) formant une vis fermée dont le rayon diminue à son extrémité inférieure, ayant de préférence le même pas que la partie supérieure (6); un tube inférieur d'un diamètre plus petit que le double du plus grand rayon (R2) du composant à déplacement et situé entre la partie inférieure (7) de ce dernier composant (2) et l'extrémité inférieure de la tarière; une lame de vis (4) soudée à l'enveloppe externe du tube inférieur, lequel tourne dans le même sens que la partie inférieure (7) du composant à déplacement (2) et une pointe de tarière (5) reliée à l'extrémité inférieure du tube inférieur, ayant comme particularité que le tube inférieur de la tarière constitue un tube intermédiaire (3) dont le diamètre externe (D3) qui est plus petit que le double du plus grand rayon (R2) du composant à déplacement (2) mais plus grand que le diamètre externe (D1) du tube tarière (1), tandis que la pointe de tarière (5) contient une pièce à déplacement (16) munie d'une vis fermée tournant dans le même sens que la lame de vis (4) du tube intermédiaire (3) et un rayon maximum correspondant à la moitié du diamètre (D3) du tube intermédiaire (3).

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