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평수구역을 운항하는 여객선의 차량고박 기준에 관한 연구

A Study on Lashing Standards for Car Ferry Ships Sailing in Smooth Sea Areas

  • 투고 : 2020.01.08
  • 심사 : 2020.02.25
  • 발행 : 2020.02.28

초록

차량 및 화물 고박불량과 횡경사에 따른 화물의 이동으로 인한 여객선 침몰사고 이후 화물 고박의 중요성이 제기되었고 카페리선박의 구조 및 설비 등에 관한 기준이 개정되어 풍속 7 m/sec, 파고 1.5미터를 초과하는 해상상태에서는 평수구역을 운항하는 카페리여객선에 적재된 모든 차량은 고박을 실시해야 한다. 본 연구에서는 평수구역을 운항하는 여객선의 해상상태에 따른 선체운동을 계측하고 NSM(New Strip Method) 계산 결과와 비교 하였으며, 대상선박은 풍속 6 ~ 8 m/s, 파고 0.5 ~ 1.0미터의 해상상태에서 최대 1.41° 및 1.37°의 종 동요와 횡 동요를 하였고, 풍속 10 ~ 12 m/s, 파고 1.0 ~ 1.5미터의 해상상태에는 최대 1.49° 및 2.43°의 종 동요와 횡 동요를 하였다. 선체운동 결과를 반영하여 외력과 지지력을 비교해 본 결과 고박하지 않은 상태의 지지력이 더 강한 것으로 평가되어 해당 기상조건에서는 고박을 하지 않아도 차량이 미끄러지거나 전도되지 않는 것으로 평가되었다. 향후 다양한 선박의 선체운동 측정, 외력 및 지지력 비교를 통해 보다 합리적인 차량고박 기준 개정이 요구된다.

In recent years, cargo lashing has received much importance, to help prevent the sinking of passenger ships due to the failure of vehicle and cargo lashing during the transshipment of cargo. Consequently, the standards for lashing equipment and the structure of car ferries have been revised. According to the current standards, all vehicles loaded on a car ferry sailing in smooth sea areas must be secured if the wind speed and wave height exceed 7 m/s and 1.5 m, respectively. In this study, we measured the roll and pitch of a passenger ship sailing in smooth sea areas, and compared the measurements with the results of the New Strip Method (NSM). The vessel had a maximum pitch of 1.41° and a maximum roll of 1.37° at a wind speed of 6-8 m/s and a wave height of 0.5-1.0 m, and a maximum pitch of 1.49° and a maximum roll of 2.43° at a wind speed of 10-12 m/s and a wave height of 1.0-1.5 m. A comparison of the external forces due to the motion of the hull and the bearing capacity without lashing indicated that the bearing capacity was stronger. This suggests that vehicles without lashing will not slip or fall due to weather conditions. In future, the existing vehicle lashing standards can be revised after measuring the hull motions of various ships, and comparing the external force and bearing capacity, to establish more reasonable requirements.

키워드

참고문헌

  1. Choung, J. M., H. S. Jo, K. H. Lee, and Y. W. Lee(2016), Study on Structural Safety of Car Securing Equipment of Coastal Carferry: Part II Assessment of Lashing Safety according to Acceleration Prediction Approaches, A Journal of Ocean Engineering and Technology, Vol. 30, No. 6, pp. 451-457. https://doi.org/10.5574/KSOE.2016.30.6.451
  2. IMO(2011), International Maritime Organization, Code of Safe Practice for Cargo Stowage and Securing, Annex 13, pp. 3-13.
  3. IMO(2018a), International Maritime Organization, Sub-Committee on Carriage of Cargoes and Containers, 5th session, Agenda item 7.
  4. IMO(2018b), International Maritime Organization, Sub-Committee on Carriage of Cargoes and Containers, 6th session, Agenda item 7.
  5. MLIT(2019), Ministry of Land, Infrastructure, Transport and Tourism, On Cargo Securing of Ocean-Going RORO ships (in Japan), Available at: http://www.mlit.go.jp/common/000147418.pdf (Accessed: 17 Dec 2019).
  6. MOLEG(2019), Ministry of Government Legislation, The National Law Information Center, Available at: http://www.law.go.kr (Accessed: 17 Dec 2019).