PIPING STRUCTURE FOR DRAINAGE

PROBLEM TO BE SOLVED: To provide a piping structure for drainage by which the water inside a pipe hardly splashes out of the pipe even when a large amount of rainwater etc. flows down in a vertical main pipe accompanying a large amount of air, and a belching sound of the air inside the pipe is reduced. SOLUTION: In the piping structure for drainage, branch pipes are connected to the vertical main pipe 1 at a plurality of vertical positions in a communicating manner so that the water flowing from each of the branch pipes into the vertical main pipe may be drained through a horizontal main pipe. A cylindrical body 9 including a large diameter section 8 having an inner diameter larger than an outer diameter of the vertical main pipe is connected to a lower end side of the vertical main pipe in a communicating manner. The horizontal main pipe is connected to the lower part of the cylindrical body in a communicating manner, and a communicating path 11 communicating the inside of the cylindrical body with the outside thereof is opened to the cylindrical body at the part higher than a lower end opening 12 of the vertical main pipe. COPYRIGHT: (C)2009,JPO&INPIT