Method for lining a bent pipe
AssigneesShonan Gosei-Jushi Seisakusho K.K., Yokoshima & Company
InventorsTakao Kamiyama, Yasuhiro Yokoshima
Life of this patent
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Abstract
A bent pipe lining method which can get rid of bulky creases of the liner commonly formed at the bends of the pipe, and the method is characterized by a use of a flat belt that is hitched to the sewn-end of the liner bag, which pulls the flat belt inside itself as it is everted into the bent pipe; when the liner bag is hardened the flat belt is kept stretched so as to keep the bulky creases compressed and bent flatly.
Claims10
A method for lining a bent pipe with a tubular liner bag made of a nonwoven fabric impregnated with a hardenable liquid resin, one end of said tubular liner bag being closed, comprising the steps of:
- (a) fixing one end of a flat belt at said closed end of the tubular liner bag;
- (b) everting said tubular liner bag into the bent pipe;
- (c) stretching said flat belt;
- (d) inflating the everted tubular liner bar to press against the inner wall of the bent pipe by increasing the pressure inside the everted tubular liner bag;
- and
- (e) hardening said hardenable liquid resin impregnated in the tubular liner bag while keeping the tubular liner bag pressed against the inner wall of the bent pipe and keeping said flat belt stretched;
- wherein at said step (a) fixing the other end of said flat belt outside that end of the bent pipe from which the tubular liner bag is everted into the bent pipe;
- and at said step (c) before stretching the flat belt, opening said closed end of the tubular liner bag and untying the flat belt from said tubular liner bag, and retying the untied end of the flat belt to an eversion tube configured to close the opened end of the tubular liner bag.
A method of lining a pipe, comprising the steps of:
- installing a hardenable tubular liner within a bent pipe;
- hardening the installed tubular liner;
- and
- stretching a flexible belt so as to press a portion of the installed liner against a bent inner wall portion of the bent pipe during hardening.
Dependencies are inferred from the claim text.