Propulsion process of buried pipe

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(11)

EP 0 451 683 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.10.1991 Bulletin 1991/43

(43)	Date of publication A2:
	16.10.1991 Bulletin 1991/42

(21)	Application number: 91105266.0

(22)	Date of filing: 03.04.1991

(51)	International Patent Classification (IPC)⁵: E21B 7/20, E21B 17/00, E21B 17/20, E21B 19/22

(84)	Designated Contracting States:
	DE FR GB IT NL

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Priority:

05.04.1990 JP 91863/90

(71)	Applicant: KIDOH TECHNICAL INS, CO., LTD.
	Higashinada-ku Kobe-shi, Hyogo (JP)

(72)	Inventor:
	Kimura, Koichi Higashinada-ku, Kobe-shi, Hyogo (JP)

(74)	Representative: Glawe, Delfs, Moll & Partner
	Patentanwälte Postfach 26 01 62 80058 München 80058 München (DE)

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References cited: :

(54)	Propulsion process of buried pipe

(57) In a propulsion process of buried pipe, an endless pipe to be buried is formed by sequentially curving a pipe material (62) of long hoop shape made of a plastic material, and this endless pipe is successively inserted and propelled into the burying hole while forming the burying hole by propelling a leader (10) in the ground.

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