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Economic Feasibility of Bucket Foundation for Offshore Wind Farm

해상풍력발전 버켓기초공법의 경제성 평가

  • Oh, Myoung-Hak (Coastal Engineering & Ocean Energy Research Department, Korea Ocean Research & Development Institute) ;
  • Kwon, O-Soon (Coastal Engineering & Ocean Energy Research Department, Korea Ocean Research & Development Institute) ;
  • Kim, Keun-Soo (Coastal Engineering & Ocean Energy Research Department, Korea Ocean Research & Development Institute) ;
  • Jang, In-Sung (Coastal Engineering & Ocean Energy Research Department, Korea Ocean Research & Development Institute)
  • 오명학 (한국해양연구원 연안개발.에너지연구부) ;
  • 권오순 (한국해양연구원 연안개발.에너지연구부) ;
  • 김근수 (한국해양연구원 연안개발.에너지연구부) ;
  • 장인성 (한국해양연구원 연안개발.에너지연구부)
  • Received : 2012.02.02
  • Accepted : 2012.04.12
  • Published : 2012.04.30

Abstract

As the turbine capacity and the water depth of wind farms are increasing, the construction cost of substructures and foundations for offshore wind turbines is expected to increase. Since the installation of suction bucket foundation is achieved by both self-weight and applied suction, the construction generally does not require heavy equipment for penetration. This study provides an economic analysis on the tripod which have the bucket foundations and compares that the jacket foundation at 50m water depth on sand layer or soft layer. As the strength of the soil and the number of the foundation is increasing, the construction cost of the tripod with the bucket foundations is more economically feasible than the jacket foundation.

풍력발전기의 용량이 점차 대형화되고 해상풍력단지는 수심이 깊은 곳에 조성됨에 따라 해상풍력발전구조물의 하부구조 및 기초시공비용 또한 급격히 증가될 것으로 예상된다. 석션버켓기초는 버켓형식의 기초를 자중에 의한 관입과 자중관입 이후 석션에 의한 관입으로 설치하는 공법이며, 대형장비 대신 충분한 용량의 펌프만 있으면 기초의 시공이 가능하므로 시공이 간편하고 경제적인 공법으로 알려져 있다. 본 연구에서는 석션버켓기초의 경제성을 검토하기 위하여 상부지반이 사질지반과 연약지반인 경우일 때 대수심 조건에 적용 가능한 기초형식인 자켓과 석션버켓기초를 적용한 트라이포드의 시공비용을 비교하였다. 그 결과 지반이 단단하고, 기초개수가 증가할수록 자켓형식보다는 트라이포드 버켓기초형식을 적용하는 것이 더 경제적임을 확인하였다.

Keywords

References

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