Helical anchor with hardened coupling sections

E - Fixed Constructions – 02 – D

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E02D 27/48 (2006.01) E02D 5/54 (2006.01) E02D 27/32 (2006.01)

Patent

CA 2584592

A helical anchor capable of use in high load-bearing capacity applications involving extreme drive torque conditions, the anchor having a main drive shaft machine fabricated with an integrally formed hardened alloy steel coupling section that is adapted to mate with a similarly hardened and integrally formed corresponding coupling section of an extension shaft. The coupling sections are formed of seamless high-carbon heat-treated alloy steel which is quenched and tempered to a yield and tensile strength approximating 135,000 psi, and inertia friction welded to the hot-finished seamless alloy steel tubing utilized in the formation of the remainder of the drive and extension shafts.

Un élément d'ancrage hélicoïdal en mesure de résister à de fortes charges découlant de couples moteurs extrêmes; l'élément est constitué d'un arbre d'entraînement principal fabriqué à la machine et formé d'une section de raccordement intégrale en alliage d'acier durci conçue pour s'adapter à un élément de raccordement intégral fabriqué d'un alliage d'acier durci similaire et fixé à un arbre de prolongement. Les sections de raccordement sont formées d'un alliage d'acier à forte teneur en carbone, traité à la chaleur et sans soudure, conçu pour résister à une force de rupture à la tension d'environ 135 000 lb/po2 et soudé par friction avec volant d'inertie au tube en alliage d'acier, traité à chaud et sans soudure, utilisé pour la fabrication des autres éléments des arbres de prolongement et d'entraînement.

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