Study On The Characteristic Of A New Type Of Straight Tube Bend Water Seal For Water Storage

Effective improvement of drainage capacity of building drainage system is a hot issue in the field of building drainage,and it is also an urgent problem to be solved.Building drainage system is closely related to our daily life,directly related to our living standards,health and environmental hygiene.With the continuous progress of society,human beings not only require building drainage system to discharge sewage and wastewater from daily life in a timely and smooth manner,but also need building drainage system to have sufficient reliability and ensure indoor environmental hygiene.The sanitary and reliability performance of building drainage system is determined by water seal,and the reliability of water seal can be guaranteed mainly from the two aspects of water seal itself and ventilation system protection to ensure that water seal is not destroyed.In this paper,on the basis of searching the testing methods of drainage system and drainage capacity at home and abroad,using the new straight-tube water storage bend designed by Yueyang Zhou Liangbin and the static experimental device of drainage in Civil Engineering College of Hunan University,the compressive performance of the new straight-tube water storage bend is sought and verified through static and dynamic experiments.Firstly,static experiments were used to test different water-seal ratio of straight-tube water-storage bends,and it was concluded that the water-seal ratio of straight-tube water-storage bends was 5,which met the requirements of water-seal.Static experiments laid a foundation for the next dynamic experiments to find new water-storage bends for experiment,which reduced the experimental workload increased by replacing different structure water-storage bends many times during dynamic experiments,and also increased the experimental workload.Aim and experimental efficiency.Dynamic experiments can not only study the main factors affecting the water seal performance,but also test the drainage capacity and negative pressure resistance of the new straight-tube water storage bend under dynamic conditions.Dynamic experiments are carried out in the water supply and drainage Laboratory of Hunan University by using the fixed-flow drainage testmethod.The drainage system is an extended roof ventilation and drainage system.During the experiment,the drainage pressure is automatically monitored,and the change of the water seal height is observed manually.From the residual water seal height and drainage pressure,the ability of the straight tube water storage bend seal to maintain and resist negative pressure drainage is analyzed comprehensively.Finally,the following conclusions are drawn:(1)By comparing the experiments of different water seal ratios under the static test,it is found that the larger the water seal ratio,the higher the remaining water seal height and the stronger the drainage capacity,but the larger the water seal ratio,the larger the installation space,and the higher the material and production cost,the comprehensive drainage performance,installation space and economy,it is concluded that the new straight tube water seal ratio of 5 is the optimal structure design;(2)According to the test results of different drainage flow under dynamic experiment,when the water seal height is 50 mm and the water seal ratio is 5.0,the drainage flow of the system is 3.5L/s and the maximum negative pressure resistance is 840 Pa.By optimizing the water seal in the drainage system,it breaks through the traditional theory that the water seal can withstand the positive pressure of 40 mm hydrogen peroxide in the pipe only by withstanding the negative pressure of 40 mm hydrogen peroxide in the pipe.(3)According to the test results of different drainage discharge under dynamic experiment,when the drainage discharge is the same,the higher the floor is,the larger the negative pressure value is,and the smaller the residual water seal height is.When the drainage discharge changes,the larger the drainage discharge,the larger the negative pressure value is,and the smaller the residual water seal height is.(4)By comparing the drainage of traditional water storage bend with that of new straight-tube water storage bend under dynamic experiment,it can be seen that the drainage performance of the new straight-tube water storage bend is better than that of the traditional water storage bend when the drainage flow is the same and the residual water seal height of the traditional water storage bend is less than that of the new straight-tube water storage bend on the same floor.(5)According to the analysis of pressure variation law of each floor pressuremeasuring point under dynamic experiment,the pressure in drainage riser is alternately positive and negative pressure,the upper part of drainage riser is negative pressure area,the lower part is positive and negative pressure change area,and the bottom is positive pressure area,the higher the negative pressure value of the upper layer is,the maximum positive pressure value of the bottom layer is,and the damage of water seal begins from the top layer.