| 摘要 |
FIELD: construction. ^ SUBSTANCE: downpipe is divided into upper and lower parts, accordingly, lower and upper ends of which are brought into a basement room, at the same time the upper end of the lower part of the downpipe is arranged as a water lock, which is filled with water, and the lower end of the lower part is connected to a sewage pipe. When ambient temperature is close to zero, warm air of the basement room heated by means of a heating pipe arrives to the upper part of the pipe by means of natural draught, preventing its icing as ambient temperature goes negative. In the cold time of the year the wire length reduces, and the end is lowered into water of the water lock, being rotated in an elastic coupling. Air outlet from the basement room is stopped. ^ EFFECT: reduction of power inputs and labour intensity during operation of drains. ^ 9 cl, 3 dwg |
