考虑最小隔离单元的古城镇消火栓维修策略分析

Strategies for Fire Hydrant Maintenance in Ancient Towns Considering Segment

云南省许多古城镇设置了专用消防管网,但由于常年暴露在室外,消火栓易发生故障。然而,由于复杂的管网拓扑结构及不合理的阀门布置,如何有效确定关阀策略对故障消火栓进行维修是当前面临的难题。针对上述问题,提出了利用Johnson最短路径算法生成距离矩阵,通过充分利用管网INP文件反映的带阀门管网拓扑结构特点,一次性找到故障消火栓对应的最小关阀布局,进而快速识别最小隔离单元,使故障消火栓的维修对管网的影响最小。相较于之前的方法,所提出的方法无需构建连通性矩阵或进行水力计算、添加虚拟阀门,故具有计算效率高、使用方便的优点。将该方法应用于云南某古城镇专用消防供水管网中,并根据关阀数与故障消火栓导致的停用消火栓数,提出了分级关阀维修和维护消火栓策略。结果表明,该古城镇管网中需要重点维护的消火栓占总数的30.82%,而需要优先维修的消火栓占32.87%。

Many ancient towns in Yunnan Province have set up special fire protection pipelines,in which these fire hydrants are prone to malfunctions because of perennial exposure to the outdoors.However,the effective determination of the valve closing strategy for repairing faulty fire hydrants is currently a challenge due to the complex topology of the pipeline network and unreasonable valve arrangement.In response to the above issues,a distance matrix was generated by using Johnson’s shortest path algorithm,the minimum valve layout corresponding to the faulty fire hydrant was found at once by fully utilizing the topological structure characteristics of the pipeline network with valves reflected in the INP file,and thus segment was quickly identified to minimize the impact of faulty fire hydrant repair on the pipeline network.Compared with the previous methods,the proposed method did not require the construction of connectivity matrices or hydraulic calculations,or the addition of virtual valves,thus having the advantages of high computational efficiency and convenient use.The method was applied to a special fire water supply network in an ancient town in Yunnan Province,and the strategy for graded valve closure repair and maintenance of fire hydrants was proposed according to the number of closed valves and the number of unworkable faulty hydrants.In the ancient town pipe network,30.82%of the fire hydrants required key maintenance,while 32.87%of the total fire hydrants required priority maintenance.