Effect of block distribution system on water supply after earthquake

对某块配网进行了地震对策分析，从消防给水管道设置紧急截止阀的作用和损坏管道的修复过程两个方面进行了探讨。紧急截止阀可以增加用于灭火的消防栓数量。它还建议有必要用抗震管道取代旧管道。如果应急阀具有检测泄漏量的功能，则可以较长时间地利用水库中的水进行灭火。研究发现，在块系统中，除了配网的形式外，供水中的备用系统也是一个重要的因素。在恢复过程中，其在配电类中的顺序必须为配电干线、分块配电干线、配电副干线。此外，直径较大的管道需要更早修复。此外，供应区域上游的块状管道必须提前修复。在维修过程中，阻塞系统的形成不会降低公平性。在有许多管道受损的地区，开始维修管道的过程可以有助于减少维修工作中的不公平现象。

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.