Effect of block distribution system on water supply after earthquake

为了研究地震对策，对配电网进行了分析，从消防管道上设置紧急截止阀的效果和分区配电系统中受损管道的恢复过程的角度进行了研究。紧急截止阀可以增加消防可用的消防栓数量。它还建议有必要用抗震管道取代旧管道。如果紧急阀能够检测泄漏量，则配水池中的水可以更长时间地用于消防。研究发现，除了块系统中的分配网络形式之外，供水备用系统也是一个重要因素。在恢复过程中，它在配电类中的顺序必须是配电干线、分段配电干线、配电次干线。此外，直径较大的管道必须提前修复。首先，供水区上游街区的管道必须提前修复。在修理工作期间，块系统的形成不会降低公平性。在有许多损坏管道的地区开始修复管道的过程可能有助于减少修复工作中的不公平。

Distribution network analyses have been carried out to investigate earthquake countermeasures from the viewpoints of the effect of emergency stop valves set on service pipes for fire fighting and restoration processes of damaged pipes in a block distribution system.Emergency stop valves can increase the number of hydrants available for fire fighting. It has also suggested that it is necessary to replace older pipes by earthquake-resistant pipes. Water in a service reservoir can be utilized for fire fighting for a longer time if emergency valves function detecting leakage volume.It was found that a back-up system in supplying water is an important factor in addition to forms of a distribution network in a block system. In the restoration process, the order of it in distribution classes must be distribution mains, distribution mains in blocks, distribution submains. In addition to this, pipes in larger diameter have to be repaired earlier. Frthermore, pipes in blocks on the upper stream in a supply area have to be repaired earlier. Formation of a block system does not decrease equitability during the repair work. A process to start to repair pipes in the district where there are many damaged pipes could contribute to decrease unequitability during the repair work.