浄水場における傾斜板沈降装置のスロッシング被害対策に関する研究

抄録

High rate plate settler modules are solid and liquid separation devices to improve precipitation efficiency of purification in settling tanks in purification plants. In the 2011 off the Tohoku Pacific coast Earthquake, the high rate plate settler module fell off and it was damaged. As a result, supply of the water stopped for a long time. It is considered that liquid sloshing by long period ground motion caused these damages. There are examples of damage as liquid sloshing in the past, fire of an oil tank, and damage of device in a tank, overflow of fluid in storage pool for spent nuclear fuel in a nuclear power plant. From these backgrounds, there are a lot of researches of sloshing for those oil tanks and those nuclear power plants. On the other hand, there are few researches for settling tank in purification plant. Settling tank in purification plant is an important lifeline essential to economy and activity. Therefore, it is necessary to take measures so such kind of damage will not occur again. The purpose of this study is to propose high rate plate settler module with mechanism, which can suppress damage by liquid sloshing and has good repairability. In this paper, we examined that the sloshing occurred by purification plant inclined plates were moved in a long period ground motion. When the inclined plates damaged and falling off, its have became a problem. Therefore, we proposed vibration control devices. Authors performed the sloshing experiment by the miniatures, and investigated the effect of the vibration control devices. Authors carried out the identification of the result based on Housner theory, construction of the analysis model by mass system. Examination of sloshing damage carried out by using the analysis model.