| 摘要 |
Sewer shaft to invention consists of the base (1) of plate shape and a hollow body (2) equipped with the inlet opening (23) and / or ceiling (3) which are mutually rigidly connected. Body (2) is designed such that the horizontal cross-section in at least part of the surface upwards or downwards narrowing. Preferably body (2) consists of the lower part (21) and upper part (22), at least one of these parts have a tapered cross section and is made of plastic material selected from the group polyethylene or polypropylene, polyvinyl chloride, or of a thickness 4-20 mm. |
