| 摘要 |
PURPOSE:To obtain such a device as is capable of grasping easily a situation of how the ground surface wave spreads instantaneously by a system wherein a multitude of piles are driven at equal intervals and linearly onto the ground surface to measure, and a continuous camera is provided on extension of a pile row. CONSTITUTION:A multitude of piles 1 are driven at equal intervals l and linearly onto the ground surface G, and a line to connect heads 1a of the piles 1 is kept linear horizontally or at a given grade. Further, a seismic waveform recording device is provided with a continuous camera or a video camera 5 at a position high H from a spot A on extension of the line connecting each pile head. Where an earthquake occurs under such constitution, the camera 5 starts photographing continuously, and a deformation of the pile row from the above condition is also photographed. A correlative position among the piles 1 at an instant and a displacement thereafter can be therefore obtained easily. |
