| 摘要 |
<p>In an arrangement, in which a gutter receptacle (3) is connected to drainage collection conduit (14,15) through a siphon trap (5,9), the new feature is that the part (9) of the siphon trap lying outside the bottom section (5) of the receptacle (3) is a part of a doubly-curved pipe (9,10), the downstream end (11) of which is connected to the collecting pipes through a sliding muff (12). The opening (7) is preferably cast by using a core or core ring (not shown) of a material with low mechanical strength, such as hard cellular plastic, which remains in the opening until the pipe (9,10) is to be installed. This provides in part for an accurate casting of the opening (7), in part a protection of this opening during transport and handling between the casting operation and the installation work.</p> |
