Visual Precise Measurement of Pile Rebound and Penetration Movement Using a High-Speed Line-Scan Camera

  • Lim, Mee-Seub (Dept. of Mechatronics, Kyonggi Institute of Techonology) ;
  • You, Bum-Jae (Intelligent Coltrol System Research Center, KIST) ;
  • Oh, Sang-Rok (Intelligent Coltrol System Research Center, KIST) ;
  • Han, Song-Soo (Engineering & Construction, Samsung Corporation) ;
  • Lee, Sang-Hun (Engineering & Construction, Samsung Corporation)
  • Published : 2002.12.01

Abstract

When a construction company builds a high structure. many piles should be driven into the ground by a hammer whose weight is 7,000 kg in order to make the ground under the structure safe and strong. So. it is essential to determine whether a pile is penetrated into the ground enough to support the weight of the structure since ground characteristics at different locations are different each other. This paper proposes a visual measurement system for pile rebound and penetration movement including vibration using a high-speed line-scan camera and a specially designed mark to recognize two-dimensional motion parameters of the mark using only a line-scan camera. A mark stacking white and black right-angled triangles is used for the measurement, and movement information for vertical distance, horizontal distance and rotational angle is determined simultaneously. Especially- by adopting a line-scan CCD camera whose line rate is 20 ㎑. the measurement performance of dynamic characteristics of the pile at impact instant is improved dramatically.

Keywords

References

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