Spiral flights for improved soil mixing and efficient boring...

E - Fixed Constructions – 02 – D

Patent

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E02D 5/46 (2006.01) E02D 3/12 (2006.01) E02D 5/18 (2006.01) E21B 7/00 (2006.01) E21B 10/44 (2006.01)

Patent

CA 2115682

An apparatus for constructing subterranean structures, soil-chemicals mixture or soil-agents mixture by using a multi-shaft auger machine to mix oil with a chemical hardener in situ. As the auger shafts of the multi-shaft auger machine penetrate the soil, spiral flights attached to the auger shaft above the initial auger blades assist soil in passing by supporting structures located between adjacent auger shafts. The spiral flights both assist in raising the soil beyond the supporting structures and also prevent reagglomeration of the soil prior to passing by the supporting structures. The spiral flights have a diameter less than that of the auger blades attached to the shaft below the spiral flights and have a connection ranging from 360 degrees to 720 degrees around the shaft. The use of the spiral flights within this location results in a reduction in the amount of energy needed to auger a borehole, thereby resulting in excess energy for a more homogeneous mixing of the chemical hardener in the soil through which the auger passes. In addition to the increase in efficiency because of the available energy, the spiral flights also directly increase the surface area of structures attached to the auger shaft thereby increasing the mixing efficiency of the auger shaft as it passes through the borehole. The increased efficiency and the prevention of reagglomeration of soil are most beneficially observed in clay or clay-like soils.

Appareil de construction d'ouvrages souterrains comportant une tarière mécanique à vrilles multiples permettant le mélange in situ d'un durcisseur chimique avec le sol. La pénétration des vrilles dans le sol est assistée par une deuxième vis hélicoïdale placée sur la tige au-dessus de la vis terminale, qui réduit la résistance à la pénétration qu'opposent les éléments de renfort reliant les tiges entre elles. Ces deuxièmes vis servent à la fois à favoriser la remontée du sol de part et d'autre desdits éléments de renfort et à empêcher le sol de s'agglomérer de nouveau entre sa sortie de la vis terminale et lesdits éléments de renfort. La deuxième vis décrit un parcours de 360 à 720 degrés autour de la tige de la vrille, et son diamètre est inférieur à celui de la vis principale. L'avantage de ces deuxièmes vis est qu'elles réduisent la quantité d'énergie de pénétration nécessaire, l'énergie économisée pouvant par conséquent être employée pour réaliser un mélange sol-durcisseur plus homogène. D'où un gain d'efficacité. De plus, en augmentant la superficie des organes de pénétration, elles améliorent l'incorporation du durcisseur au sol. Ces gains d'efficacité, de même que l'avantage qu'il y a à ce que le sol ne se recompacte pas en sortant de la vis terminale, s'observent davantage en sols argileux ou de nature apparentée à l'argile.

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