METHOD FOR CONNECTING POLYETHYLENE PIPE USING BUTT JOINING HEAT FUSION

WIPO Patent Application WO/2015/160201

A1

The present invention relates to a pipe connection method which connects two polyethylene pipes to each other by means of butt joining fusion, the method comprising: a cleaning step (S200) for cleaning inner and outer circumferential surfaces of ends of first and second pipes (10, 20); a pipe clamping step (S300) for installing and fixing the first and second pipes (10, 20) in a fusing device by means of clamping; a pipe fine-alignment step (S500) for finely adjusting and arranging the installation position of the ends of the first and second pipes (10, 20); a pipe end fusing step (S600) for fusing both ends of the first and second pipes (10, 20) by using a thermal conductive plate; and a pipe bonding step (S700) for allowing the fused ends to be bonded by butting the ends of the first and second pipes (10, 20), and applying pressure to the first and second pipes (10, 20) until the butted portion is cooled to an appropriate temperature, thereby allowing the first and second pipes (10, 20) to be continuously maintained in a pressurized state, wherein in the pipe bonding step (S700), the pressure applied to the second pipe (20) is controlled to follow a change in a specific volume of the bonded portion of the first and second pipes (10, 20). By the above features, the present invention can achieve a polyethylene pipe fusion which is mechanically stronger and is capable of suppressing growth of cracks.

OH JU SEOK (KR)
CHOI SUNWOONG (KR)

PCT/KR2015/003836

October 22, 2015

April 16, 2015

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HANNAM UNIVERSITY INDUSTRY ACADEMIA COOPERATION FOUNDATION (KR)

B29C65/18; F16L47/03

KR0130947B1	1998-04-13
JP2004243657A	2004-09-02
KR100712646B1	2007-05-02
JP2002045977A	2002-02-12

LEE, Moonwook (KR)
이문욱 (KR)

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