Method and apparatus for building support piers from one or...

E - Fixed Constructions – 02 – D

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E02D 3/08 (2006.01) E02D 3/054 (2006.01)

Patent

CA 2641408

A method and apparatus for forming a support aggregate pier having compacted aggregate lifts in a soil matrix, includes an elongate, hollow tube with a bulbous leading end bottom head element that is forced or lowered into the soil matrix. The hollow tube includes a mechanism for releasing aggregate from the lower head element of the tube as the tube is lifted in predetermined increments. The same hollow tube is then lowered or pushed in predetermined increments to vertically compact the released aggregate in thin aggregate lifts, while forcing a portion of the compacted aggregate transaxially into the soil matrix at the sidewalls of the cavity. The process may be repeated to form a series of compacted aggregate lifts comprising an aggregate pier or the process may include forming only a single lift for the aggregate pier while densifying adjacent matrix soils and imparting lateral stress in these soils.

Appareil et méthode de construction d'un pilier d'appui en agrégat muni de couches successives compactées dans une matrice de sol; il comporte un tube creux de forme allongée, avec une extrémité avant en forme de tête inversée qui est enfoncée ou descendue dans la matrice du sol. Le tube creux comprend un mécanisme de relâchement d'agrégat de la tête inversée du tube à mesure que ce dernier est relevé progressivement à une hauteur prédéterminée. Le même tube creux est ensuite abaissé ou enfoncé par incréments progressifs prédéterminés afin de compacter verticalement l'agrégat libéré par couches minces successives, tout en forçant une partie de l'agrégat compacté sur le plan transaxial dans la matrice du sol, sur les parois de la cavité. Le processus peut être répété pour former une série de couches compactées successives composant un pilier d'agrégat, ou le processus peut comprendre la formation d'une seule couche pour le pilier en agrégat tout en densifiant les sols de la matrice et en exerçant sur ces sols une contrainte latérale.

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