Establishment of the Measuring System of Earthquake Acceleration at the Intake Tower of the Reservoir

本课题是对强震加速度数字记录采集的继续研究的延伸，目的是建立水库进水塔地震加速度记录测量系统。1995年，调查人员将加速度计放置在由水利开发公共公司博索运河项目建造的长加拉坝水库钢筋混凝土进水塔的顶部，以获得加速度记录。大坝位于千叶县市原市和长原镇的交界处。本研究的基本目的是研究进水塔在地震作用下的振动特性。使用GPS系统对放置的加速度计安装准确的实时测量和时间标记系统。使用NTT移动电话系统安装从加速度计到任何距离的地方的无线数字通信系统。这是通过将移动电话连接到放置的加速度计来完成的，并且加速度计始终待命，以接受通过电话网络连接的任何地方的远程记录场所的命令。修改或更新东京农工大学实验室加速度计，其记录机构已失效，进入不可恢复状态。该仪器是另一种用于测量常见建筑地震运动的加速度计，具有老式的记录系统。新更换的与进气塔相同类型的加速度计安装在京都大学的实验室。

This topic is on the extension of the continuing research of collecting the digital record of strong earthquake acceleration, and its aim is to establish the measurement system of earthquake acceleration records in the intake tower of the reservoir. In 1995, the investigator had worked to get the acceleration record by placing the accelerometer in the top of the RC-intake tower built in the reservoir of NAGARA dam, which was constructed by BOSO canal project of Water Resources Development Public Corporation. The dam was located on the border between Ichihara city and Nagara town in Chiba prefecture. The fundamental concern of the research is to investigate the nature of the vibration characteristics of an intake-tower caused by earthquake.The Main installations and the benefits obtained by the project are as follows.1. Installation of the accurate real time measure and time marking system using the GPS system to the placed accelerometer.2. Installation of the wireless digital communication system from the accelerometer to any distanced place using the NTT mobile telephone system. This was done by attaching the mobile telephone to the placed accelerometer, and the accelerometer always stand by to accept the command by the remote recording place anywhere connected by telephone network.3. Amending or renewal of the laboratory accelerometer at the Tokyo University of Agriculture & Technology, of which recording mechanism had been failed into unrecoverable state. This instrument was another accelerometer aiming to measure the common building earthquake motion, and had an old fashioned recording system. The new replaced accelerometer of the same type equipment as the intake tower was installed at the laboratory of Kyoto University.