LAYING METHOD FOR SOIL PIPE IN SHIP LIVING QUARTER AND COUNTERFLOW PREVENTING DEVICE USED THEREFOR

摘要

PROBLEM TO BE SOLVED: To increase efficiency of generating work and installing work of a through piece and connecting work of a drain pipe by integrally connecting a first drain pipe for directly draining soil water from a toilet bowl and a second drain pipe for draining soil water flowing on an installing floor surface of the toilet bowl to a common through piece in a laying method of a soil pipe of a ship living quarter and an counterflow preventing device used therefore. SOLUTION: A first soil pipe 7 for draining soil water 4 from a toilet bowl 3 in a unit lavatory 1 of a ship living quarter 2 and a second drain pipe 10 for draining soil water 8 flowing on an installing floor surface 5 of the toilet bowl are integrated so that soil water is drained by the same drain port. A counterflow preventing device 30 is formed in a valve case 31 by a rigid member, an upper end part 33a of a flexible check valve plate 33 is fixed to a porous plate 32 slantingly installed in the flowing water direction A (a letter equivelent to the first square form of Japanese alphabet) to be arranged so as to be capable of contacting/sparating to alway allow the passage of flowing water and as well as to check a counter flow.