衝撃弾性波法を適用したコンクリート基礎抗の形状推定に関する基礎的研究

Abstract

In this study, the applicability of impact echo method to evaluate the sectional shape of concrete pile was examined experimentally. Following results were obtained in this study : 1) In the case that the angle between input point and setting point of accelerometer is 90 degrees, the reflect wave is hardly affected by the flexural vibration of concrete pile, and the measured waveform becomes most simple one. 2) When the time more than 24 and 3 hours passes after filling and driving the concrete pile, it is difficult to detect the wave reflected from the pile tip, because the effect of soil and cement milk around the concrete pile becomes remarkable, respectively. 3) In the concrete pile that the ratio of length to diameter is relatively small, the accuracy of estimation on the sectional shape of concrete pile is not satisfactory as compared with the slender concrete pile.