DOI QR코드

DOI QR Code

Improved Escalation Method for the Cost Estimation System using Previous Bid Price in Public Construction Projects

공공 건설공사에서의 실적공사비 적용에 따른 물가변동률 산정기준 개선방안

  • Baek, Seung-Ho (Construction Management.Economic Research Devision, Korea Institute of Constructin Technology) ;
  • Kang, Tai-Kyung (Construction Management.Economic Research Devision, Korea Institute of Constructin Technology) ;
  • Lee, Yoo-Sub (Construction Management.Economic Research Devision, Korea Institute of Constructin Technology)
  • Received : 2011.11.14
  • Accepted : 2012.01.06
  • Published : 2012.02.20

Abstract

Escalation method examining the changes in price index has been widely utilized in public construction projects. The previous escalation method determined estimated changes in price based on the average unit price of contract items over a period of time. In relation to this method, the issue has been raised that the fluctuation rates of previous method show different trends compared with other related price indices, as the influence of the small group of contract items with large unit prices overwhelms the others. This research suggested an improved escalation method which estimates the fluctuation rate by examining the changes in CCI (construction cost index) and applies it to the total amount or the partial amount deducted for labor cost in price escalation for previous bid price method. To verify the improvement, a case study is conducted on an educational facility, and the fluctuation rate was estimated in two different base periods (short term, long term). The results over the long term showed similar tendencies to those of related price indices, as well as significant differences in fluctuation rates compared to those of the previous method.

본 연구에서는 실적공사비 적용분에 대한 지수조정율 산정기준의 현황과 문제점을 분석하고 개선방향을 제시하였다. 실적공사비 적용분에 대해 공종별 실적공사비 단가의 평균값을 적용하는 기존 방식은 단가 규모가 큰 6개 공종의 변동이 전체를 좌우하여 유사 물가지표와 다른 추세를 보이는 등 비판 소지가 있다. 이에 건설공사비지수 등을 활용하는 개선방안을 제시하고 사례분석을 통해 개선의 당위성을 검증하였다. 실적공사비 비목군에 대해 건설공사비지수 등락율을 적용하는 첫번째 대안의 경우 건설공사비지수가 생산자물가지수를 활용한 가공통계이므로 유사지표간 등락추세의 일관성을 기할 수 있고, 기존 방식에 비해 물가변동 대가가 현실화될 수 있게 된다. 노무비 부분을 분리하여 별도 기준을 적용하는 두 번째 방안도 실적공사비 적용분 노무비율 만큼 투입구조 왜곡 문제가 완화되며, 유사 물가변동지표에 근접하게 되고, 물가변동 대가가 현실화된다는 측면에서 효과를 기대할 수 있다.

Keywords

References

  1. Kim KS, Hyun CT, Hong TH, Jo SM, Mun HS. Development of an unit cost modification model for proper actual cost data in small building construciton projects. Journal of the Korea Institute of Building Construction. 2010 Jun 20;10(1):81-84. https://doi.org/10.5345/JKIC.2010.10.1.081
  2. Kang YS, Kwon SW, Kim CG. The comparison analysis between quantity per unit method and past actual data input method for construction cost. Proceedings of Korea Institute of Construction Engineering and Management; 2006 Nov 11; Kyung Hee University, Suwon (Korea). Seoul (Korea): Korea Institute of Construction Engineering and Management;2006. p. 82-85.
  3. Hwang SW. Historical cost index [Internet]. DaeJeon: Public Procurement Sevice; 2006 sept [cited 2011 sept 21]. 28 p. Available from:
  4. http://www.pps.go.kr/user.tdf?a=user.board.Board App&c=2001&board_id=P_03_05_03&mc=P_03_05_03
  5. Jeong KC, Kim YA, Kim YS. Problems and improvement schemes to historical cost fluctuation ratio calculation according to the excalation. Proceeding of Korea Institute of Construction Engineering and Management; 2008 Nov 7; Korea University. seoul (korea): Korea Institute of Construction Engineering and Management; 2008. p. 884-88.
  6. Cho HH, Doe GY. Improvement of contract sum adjustment method caused by price fluctuation using construction cost index. Journal of Korea Institute of Construction Engineering and Management. 2005 Feb 21; 6(1):162-68.
  7. Kim SH. The rationalization of contract sum adjustment through case study of price fluctuation adjustment based on index adjustment method. Journal of Korea Institute of Construction Engineering and Management. 2011 Jul 21;12(4):71-7. https://doi.org/10.6106/KJCEM.2011.12.5.71
  8. Lee JS, Shin YC. Improvement on the managerial method of price fluction system. Journal of Korea Institute of Construction Engineering and Management. 2011 Mar 21;12(2):5-6.
  9. Public Procurement Sevice. Practice & Casebook on Price fluctuation[Internet]. DaeJeon: Public Procurement Sevice; 2003 nov [cited 2009 nov1]. 322 p. Available from:http://www.pps.go.kr/user.tdf?a=user.board.BoardApp &c= 2001&board_id=P_03_03_03&mc=P_03_03_03
  10. Ministry of Government Legislation. Enforcement Degree, Enforcement Regulation of Contract to which The State is a Praty[Internet]. Seoul: Ministry of Government Legislation, 2009 oct [cited 2011 oct 28). 19 p. Available from :http://www.law.go.kr/lsSc.do?menuId=0&subMenu=4&query=
  11. Ministry of Strategy and Finance. Government Contract Regulation[Internet]. Gwacheon: Ministry of Strategy and Finance, 2007 may [cited 2011 may 13). 304 p. Available from: http://www.mosf.go.kr/law/law03b.jsp