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Journal of the Korean Society of Hazard Mitigation 2014;14(1):135-144.
Published online February 28, 2014.
선굴착 스크류말뚝의 지지력 특성 연구
이충원, 김용성
Studies on Bearing Characteristics of Prebored Screw Pile Using Laboratory and Field Tests
Chung-Won Lee, Yong-Seong Kim
Abstract
At the present time, pile driving method and auger-drilled pile method is predominant method in pile construction of Korea. But pile driving method is getting difficult to use for the problem on a noise and a vibration as the subject of a civil appeal in many cities. So, auger-drilled pile method was developed as low noise and vibration method for substitution of that. However, this method has a drawback that the bearing capacity of pile is not guaranteed unless a slight driving is performed, it is impossible to solve that problem perfectly. In this study, as low-noise and vibration method for improvement of those problems, prebored screw pile method which is constructed by rotary penetration of screw pile into the prebored hole filled with some cement milk whose diameter is smaller than that of the screw pile is proposed. And for determination of shape of screw pile, laboratory test with model screw piles was conducted, and then, field load test on real screw pile fabricated on the basis of the result of laboratory test and SIP was also carried out. Based on these results, the formulae for prediction of both the end bearing capacity and the unit skin friction were proposed.
Key Words: Prebored screw pile method; Rotary penetration; Low-noise and vibration; Discontinuous screws; Laboratory and field tests
요지
타입말뚝공법과 매입말뚝공법은 국내 말뚝 시공에 있어 가장 지배적인 공법이었다. 그러나 타입말뚝공법은 민원 발생의 요인인 소음과 진동 유발의 문제 때문에 사용상의 제약을 받게 되었으며 이러한 문제를 해결하기 위하여 매입말뚝 공법이 개발되어 사용되어 왔으나 이 역시 최종 경타과정이 없이는 지지력을 보장받지 못하는 단점을 지니고 있었다. 본 연구에서는 이와 같은 문제들을 개선하기 위한 저소음 저진동 공법으로서, 말뚝 직경보다 작은 굴착공에 시멘트밀크를 주입 후 이에 말뚝을 회전관입함으로서 시공하는 선굴착 스크류말뚝 공법을 제안하였다. 이 공법의 정립을 위한 스크류말뚝의 형상 결정을 위하여 모형말뚝을 이용한 실내시험을 수행하였으며, 본 결과에 기초하여 제작된 실물 스크류말뚝에 대한 현장 재하시험을 수행, 그 결과를 함께 시공된 SIP와 비교하였으며, 이에 근거하여 스크류말뚝의 지지력 산정식을 제시하였다.
핵심용어: 선굴착 스크류말뚝 공법; 회전 관입; 저소음.저진동; 불연속 스크류; 실내시험 및 현장시험


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