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美国马里兰安德鲁空军基地建造了六幢1～2层居住建筑。为了考察室内排水系统采用小直径透气管的实际效果,在建筑物施工时,有计划地安装了直径为1/2″～2″的透气管,并装有必要的测量仪表、电气线路等。为了测定存水弯内水封深度的变化,在存水弯外壁沿水封深度方向布置一排间隔为5毫米的金属针,由此将水封深度转换为电压而传送到控制室。在房屋建成未住人之前,主要用测定存水弯水封深度的方法,在有代表性的排水负荷组合条件下,进行了试验和测
The United States Maryland Andrew Air Force Base has built six 1 to 2 story residential buildings. In order to investigate the practical effect of using a small-diameter vent tube in an indoor drainage system, a 1/2“ to 2” diameter vent tube was installed in a planned manner during the construction of the building, and necessary measurement instruments and electrical wiring were installed. In order to determine the depth of the water seal in the trap, a row of metal needles with a spacing of 5 mm is arranged along the depth of the water seal on the outer wall of the trap, thereby converting the depth of the water seal into a voltage and transferring it to the control room. Before the house was built and unoccupied, the method was mainly used to determine the depth of the water trap seal, under a representative combination of drainage load, the test and test