Process and device for boring holes

Details Process and device for boring holes Process and device for boring holes

E - Fixed Constructions

21

B

E21B 1/14 (2006.01) E02D 5/76 (2006.01) E21D 21/00 (2006.01)

Patent

CA 2294883

A process and device are disclosed for boring holes in soil or rocks, in particular for percussion or rotary percussion boring. A bore hole is formed by an annular drill bit (1) mounted on boring rods (2) and at the same time a jacket tube (3, 4) which surrounds the boring rods (2) with a certain gap is introduced. The annular drill bit (1) is flushed during boring by a flushing medium fed into the annular gap (13) defined between the boring rods (2) and the jacket tube (3, 4). When boring is completed, a setting suspension is fed into the annular gap (13) to form an anchorage with the boring rods (2). An anchorage can thus be obtained in a simple and reliable manner immediately after a bore hole is completed, in particular in loose or slack material, by means of a device having a simple design.

Procédé et dispositif destinés à creuser des trous de forage dans le sol ou dans de la roche, en particulier pour le forage par percussion ou roto-percutant. Un trou de forage est formé à l'aide d'un trépan (1) de forage monté sur des tiges (2) de forage et simultanément, un tube de gainage (3, 4) qui entoure les tiges (2) de forage à une certaine distance de ces dernières est introduit. Pendant le processus de forage, le trépan (1) est curé à l'aide d'un moyen de curage introduit dans l'espace annulaire (13) défini entre les tiges (2) de forage et le tube de gainage (3, 4). Une fois le forage terminé, une suspension de durcissement est introduite dans l'espace annulaire (13) de manière à former un ancrage avec les tiges (2) de sondage. Grâce à ce dispositif de conception simple, on peut ainsi obtenir un ancrage de manière simple et fiable, en particulier dans des matériaux meubles ou sans cohérence, immédiatement après que le trou de forage est achevé.

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