Patent ID: 9279523
Filing Date: 2016-03-08
CPC Classification: E03B,F16L,Y10T

Claim Text:
1. An installation structure of a drainpipe for preventing blockage of the pipe due to freezing of fluid, wherein the drainpipe is installed so that a longitudinal direction of the drainpipe and the vertical direction correspond to each other; the fluid streams down an inner wall of the pipe; the inner wall of the pipe comprises at least one concave portion formed in a shape having a corner portion at a cross sectional shape, or comprises at least one groove formed in a shape having a corner portion at a cross sectional shape; and the concave portion or the groove is arranged in a plural manner and in a linear manner along the longitudinal direction of the pipe as concentrating flow paths to concentrate flow of fluid, wherein an end portion on the downstream side of the pipe is made to be thin-walled compared with an upstream side.