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Study on the Rational Construction Method Using Analysis of the Case Study of PHC Pile Foundation in Song-Do Area (송도지역 내 PHC 말뚝기초 적용사례분석을 통한 적정 시공방법 연구)

  • Lee, Byengho;Lee, Jonghwi;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.3
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    • pp.55-61
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    • 2011

  • Song-Do international city is the area developed in large-scale land reclamation. Song-Do area consists of reclamation layer, sedimentary layer(loose silt, soft clay and sand alternating) and residual layer from the ground surface. Therefore, using pile foundation is inevitable to build structures safely. In this area, driven PHC piles have been generally constructed in terms of environmental and economic conditions. As a result of analyzing 4 sites in Song-Do district 5 and 7 recently, the method of driving pile has many problems because of existence of rigid soil in sedimentary layer and installation of more than 30m piles. In this case, when installing piles by drive after pre-boring up to appropriate depth, the results of constructability analysis were very good. And in the economic efficiency, although 4% of construction cost rose, it was a very slight increase in comparison with improvement of workability. In the case of the stability, more than 70% compared to the allowable stress of piles was satisfied through the load test. As a result, when PHC piles is installed in Song-Do district, the proper construction method is that piles are located at bearing layer after boring rigid sand layer.

  • https://doi.org/10.14481/jkges.2011.12.3.6 인용 PDF KSCI