Reliability Evaluation And Optimization Of Fire Water Supply System In Super-high Buildings

With the rapid growth of the global economy and the increase of the population,land resources are increasingly scarce,and people’s pursuit of living quality is increasingly improved while they seek for basic living space.As a product of economic and social development,the emergence of the super-high building is not only meet the basic needs of people,more buildings blend with formation of the universe,science and technology and culture.It is a comprehensive symbol of a country or region’s economic strength,scientific and technological level,cultural level and modernization process,its development has attracted wide attention.With the development of super-high buildings,the fire problem has been paid much attention.Therefore,the optimization design and reliability of fire water supply system for super-high buildings has become an important part in the design.This paper takes super-high buildings as the research object,discusses the water supply mode,partition mode and reliability of the fire water supply system of super-high buildings,and takes a super-high building in xi ’an city as an example to optimize the design and reliability of its fire water supply system.The main contents are as follows:(1)The water supply method of super high-rise fire water supply system is mainly divided into constant high pressure water supply method and temporary high pressure water supply method.Among them,the constant high pressure water supply method has the characteristics of safety and high reliability,which is suitable for the super-high buildings with high height.The temporary high pressure water supply method is characterized by low pressure of system pipe network and low economic cost,and it is suitable for super-high buildings with low height.The partition of super high-rise fire water supply system mainly includes parallel partition,series partition and decompression partition.Among them,parallel partition is suitable for super-high buildings with building height less than 180 m.When the building height is higher than180 m,the series partition or the combination of series partition and decompression partition should be adopted.(2)In series,parallel and mixed systems,voting systems,take the common reliability analysis model as the foundation to build the high building indoor fire hydrant system and automatic sprinkler system adopts the temporary high pressure water series partition method respectively and the temporary high pressure reducing valve and pressure relief partition mode of water supply system reliability analysis model,provide a certain theoretical basis for the reliability research.(3)Taking the fire water supply system of a super-high building in xi ’an as an example,according to the calculation results of fire water quantity and the volume of fire pool,a water supply scheme of fire water system with the combination of temporary high pressure series system and pressure-reducing valve decompression partition system was designed.The reliability of indoor hydrant system and automatic sprinkler system was analyzed,and the reliability of the two systems was up to 0.98992 and 0.98998 respectively.According to the analysis,the influence of component reliability on system reliability of indoor hydrant system is fire pool > fire pump > pipe network > hydrant >pressure reducing valve ≈ transfer water tank,and fire pool > pipe network > fire pump > alarm valve set ≈ sprinkler head > pressure reducing valve ≈ transfer water tank in the automatic sprinkler system.Based on the results,the optimization design strategy of key components such as fire pool,pipe network and fire pump was put forward.