Korean Journal of Construction Engineering and Management (한국건설관리학회논문집)

Korea Institute of Construction Engineering and Management (한국건설관리학회)
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A Case Study on Construction Cost Comparison for On-Site Construction and Off-Site Construction of Plant Project

플랜트 건설의 현장시공 및 모듈시공에 대한 공사비 비교 사례연구 - Pipe Rack을 대상으로 공사비 산정 -

  • Kang, Hyun Wook (Department of Architectural Engineering, Gwangju University)
  • 강현욱 (광주대학교 건축학부 건축공학과 )
  • Received : 2023.03.11
  • Accepted : 2023.06.29
  • Published : 2023.07.31
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Abstract

The purpose of this study is to calculate and compare construction costs for On-Site Construction and Off-Site Construction in Plant Project. For this purpose, the target for calculating the construction cost was limited to the Pipe Rack(Steel Structure and Piping). The results derived according to the purpose of the study are as follows. 1)The direct construction cost for On-Site Pipe Rack construction was KRW 56 billion, with Steel Structure KRW 25.1 billion and Piping KRW 30.8 billion won. 2)Comparing the rate of change between On-Site Construction and Off-Site Construction, material costs increased by 1.9% and expenses by 192.1%, but labor costs decreased by -9.1%, resulting in a total direct construction cost increase of 8.4%. These results can be used as reference data to check the current status of the increase or decrease in construction costs when constructing Pipe Racks as Off-Site Construction.

본 연구의 목적은 플랜트 건설에서 현장시공과 모듈시공에 대한 공사비를 산정하여 비교하는 것으로 공사비를 산정하는 대상을 Pipe Rack으로 한정하였다. 이에, 현장시공으로 준공된 국내 석유화학플랜트 건설사업 1곳을 사례로 선정한 후 비용자료를 조사하여 도출된 결과는 다음과 같다. Pipe Rack의 현장시공에 대한 직접공사비는 560억원으로 Steel Structure 251억원, Piping 308억원이며, 모듈시공에 대한 직접공사비는 607억원으로 Steel Structure 238억원, Piping 297억원으로 산정되었다. 또한, 현장시공과 모듈시공의 증감률을 비교해 보면, 재료비 1.9%, 경비 192.1% 증액되었으나, 노무비는 -9.1% 감액되어, 전체 직접공사비는 8.4%(47억원)가 증액되었다. 그리고 공사원가는 현장시공이 761억원, 모듈시공은 810억원으로 모듈시공이 6.4%(49억원) 증액되는 것으로 나타났다. 이와 같은 결과는 Pipe Rack을 모듈로 시공하는 경우 공사비가 증감되는 현황을 확인하기 위한 참고자료로 활용이 용이한 반면에, 모듈시공에 따른 간접적인 효과(노무인력 감소, 안전사고 발생 감소, 공사기간 단축 등)에 대한 연구가 필요하다.

Keywords

Acknowledgement

본 연구는 2023년도 광주대학교 대학 연구비의 지원을 받아 수행되었음.

References

  1. Exxon Mobil (2013). Project Tender Document.
  2. Kang, H.W (2022). "Risk based Value Index Evaluation Model for Modular Design Alternatives in Plant Construction Projects." Korean Journal of Construction Engineering and Management, KICEM, 23(5), pp. 98-107.
  3. Kang, H.W., Kim, J.W., and Kim, Y.S. (2018). "Risk Assessment and Contingency Prediction considering Work Characteristics for Modular Plant Construction Projects." Korean Journal of Construction Engineering and Management, KICEM, 19(5), pp. 81-89.
  4. Kim, J.W. (2017). "Scenario-based Risk Factor and Risk Cost Analysis Model for Modular Plant Construction." Thesis of M.S. The University of Chung-Ang.
  5. Kim, H.J., and Choi, J.H. (2019). "Development of a Conceptual Estimate Methodology for Plant Construction Projects." Korean Journal of Construction Engineering and Management, KICEM, 20(1), pp. 141-150.
  6. Lapp, C.W., and Golay, M.W. (1997). "Modular Design and Construction Techniques for Nuclear Power Plants." Nuclear Engineering and Design, 172(3). pp. 327-349. https://doi.org/10.1016/S0029-5493(97)00031-9
  7. Murtaza, M.B., Fisher, D.J., and Skibniewski, M.J. (1993). "Knowledge-based approach to modular construction decision support." Journal of Construction Engineering and Management, 119(1), pp. 115-130. https://doi.org/10.1061/(ASCE)0733-9364(1993)119:1(115)
  8. Park, C.H., Kim, H.J., Won, J.W., Jang, W.S., and Han, S.H. (2016). "A Study for Selecting Modular Construction Method." Korean Journal of Construction Engineering and Management, KICEM, 17(4), pp. 12-19. https://doi.org/10.6106/KJCEM.2016.17.4.012
  9. Park, K.J. (2012). "Introduction of Module Construction Method for Overseas Plant Projects." Korean Journal of Construction Engineering and Management, KICEM, 13(1), pp. 21-24.
  10. Tatum, C.B., Vanegas, J.A., and Williams, J.M. (1987). "Constructability Improvement using Prefabrication." Technical Report 297, Austin: Construction Industry Institute.
  11. Rogan, A.L., Lawson, R.M., and Bates-Brkljac, N. (2000). "Value and Benefits Assessment of Modular Construction." The Steel Construction Institute.