An apparatus for drilling open a tunnel and drilling method

Details An apparatus for drilling open a tunnel and drilling method An apparatus for drilling open a tunnel and drilling method

E - Fixed Constructions

21

B

E21B 10/26 (2006.01) E21B 7/06 (2006.01) E21B 7/20 (2006.01) E21B 7/28 (2006.01) F16L 55/16 (2006.01) F16L 55/165 (2006.01)

Patent

CA 2183870

A drilling apparatus, especially apparatus redrilling an existing hole, in the drilling head of which there is, as the first advancing part, a cylindrical unit (4) with a diameter substantially smaller than that of the hole or the tunnel which is to be redrilled, and dimensioned to fit inside the original hole or pipeline (3) and by means of which unit steering forces from the walls of the original hole (3) steer the whole drilling apparatus.

Un équipement de forage, et plus particulièrement un équipement de reforage de forage existant comporte, dans la tête de forage, une unité cylindrique (4) constituant l'élément d'attaque de progression. Cette unité cylindrique (4) est d'un diamètre substantiellement inférieur à celui du forage ou du tunnel à réaliser après reforage, et ses dimensions s'adaptent à l'intérieur du forage ou du pipeline (3). Ladite unité cylindrique (4) fait progresser l'ensemble de l'appareil de forage en appliquant les forces de progression contre les parois du forage original (3).

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