Optimal Research Of The Building Drainage System

With China building a well-off society started, large numbers of high-rise buildings have appeared;the standard of living,environmental awareness and the high-quality,high-grade environment for the pursuit of life improve simultaneously. But in the indoor drainage, the majority of residential buildings are still using the traditional indoor drainage systems approach. While traditional indoor drainage technology has been used in China for several decades of history, some problems remain unresolved like noise, wastewater overflow, the water dripping and leakage, etc. And with development of the times, some new problems appeared such as health devices placed by the restrictions. Independence, integrity, free space, energy-saving, health is the future development direction of indoor drainage system. So it is very urgent and important to improve and optimize the traditional indoor drainage system and enhancing indoor drainage system improvement and optimization study is very necessary.Modern building types are becoming more diverse. Meeting the requirements under the norms, there often have several available different types of drainage systems or ventilation options. These drainage systems have advantages and disadvantages of co-existence. Therefore, the choice of the drainage way is a question worth considering. As the drainage way of buildings is influenced by technological, economic and social environment uncertainty factors. As the evaluation often with vague, using fuzzy math method to judge the drainage way is more reasonable. This paper evaluates the quality of some drainage ways in specific conditions by using multi-level theory of fuzzy comprehensive evaluation. First, under the actual characteristics, establish evaluation factors index system,divide the involved various factors into several categories according to certain attributes; from low to high order, evaluate each category,gain an established,quantitative and actual results of the evaluation. Using multi-level fuzzy comprehensive evaluation method can fully consider the various factors of the indoor drainage system, evaluate the merits of the various drainage way from technology, economic and social environment influence, hence gain an optimal drainage way.The design seconds of the indoor drainage system reflects the design load of the drainage pipe,is the basis to determine the pipe diameter. The study of reasonable design calculation method of drainage seconds flux has important practical significance. Based on the analysis of indoor life drainage characteristics of the drainage system and the seconds flux of drainage design calculation methods at home and abroad, using the two probabilistic methods abroad for indoor water calculation, that Hunt and Russian probability, this paper explores the calculation method of seconds flux of drainage design based on the theory of probability.At the end, this paper explores the comparison and optimization of choice used for indoor drainage pipes. First, from technical and economic aspects, compares the merits of the most commonly used pipes as cast iron pipes and hard polyvinyl chloride (UPVC); then, use value coefficient method to optimize the choice of drainage pipe: calculate the functional evaluation coefficient and cost evaluation coefficient of various pipes, and then calculate the ratio of two coefficients. According to the ratio (cost-effective),determine the value of the drainage pipes and choose the most suitable pipe.