Displacement drilling tool and equipment using said tool

(19)

(11)

EP 1 277 887 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	08.09.2004 Bulletin 2004/37

(43)	Date of publication A2:
	22.01.2003 Bulletin 2003/04

(21)	Application number: 02291716.5

(22)	Date of filing: 09.07.2002

(51)	International Patent Classification (IPC)⁷: E02D 5/36, E02D 5/66, E02D 7/22, E21B 7/26, E21B 10/44, E21B 10/62

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

17.07.2001 GB 0117410

(71)	Applicant: COMPAGNIE DU SOL
	92000 Nanterre (FR)

(72)	Inventor:
	Stansfield, Lewis, Compagnie du Sol 92000 Nanterre (FR)

(74)	Representative: Dronne, Guy et al
	Cabinet Beau de Loménie, 158, rue de l'Université 75340 Paris Cedex 07 75340 Paris Cedex 07 (FR)

(54)	Displacement drilling tool and equipment using said tool

(57) A drilling tool to make piles in the soil comprising a stem 12 having a tip 16, an upper end 18 and a longitudinal axis to be connected to at least one rotating follower tube, and a helical flight 20 surrounding said stem. Said drilling tool is characterised in that the external diameter of said stem 12 decreases from the upper end to said tip, said helical flight has a substantially constant external diameter and in that it further comprises cutter means 24 fixed to said helical flight close to said tip, said cutter means projecting outside said helical flight and extending along a direction substantially perpendicular to said longitudinal axis.

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