DOI QR코드

DOI QR Code

전기저항식 로드셀을 이용한 균등긴장시스템 개발 및 성능실험

Development and Performance Experiment of Iso-tensioning System using Electrical Resistance Loadcell

  • 박원태 (공주대학교 건설환경공학부) ;
  • 천경식 (포스코건설 R&D센터 인프라연구그룹)
  • Park, Won-Tae (Department of Civil & Environmental Engineering, Kongju National University) ;
  • Chun, Kyoung-Sik (Infra Research Group, R&D Center, POSCO Engineering & Construction)
  • 투고 : 2015.10.23
  • 심사 : 2016.02.04
  • 발행 : 2016.02.29

초록

MS(Multi-Strand) 케이블은 여러 개의 강연선으로 이루어져있어, 케이블 시공시 각 강연선을 차례대로 개별적으로 긴장한다. 그리고 마지막 강연선이 정착되었을 때, 모든 강연선에 동일한 장력이 도입되어야하며, 이것이 MS 균등긴장의 핵심기술이다. 본 연구에서는 엑스트라도즈(Extradosed)교 및 사장교의 사재케이블(Stay Cable)에 적용되는 2,200MPa 초고강도 강연선들을 균등하게 긴장, 제어할 수 있는 MS 케이블 균등긴장시스템을 개발하였다. 개발한 균등긴장시스템은 전기저항식 로드셀, 유압잭, 유압펌프 그리고 통합제어기로 구성되며, Master 강연선과 Slave 강연선의 장력변화를 실시간으로 예측하며 제어하는 알고리즘을 탑재하였다. 개발시스템의 기능과 성능을 검증하기 위해 균등긴장 실험을 수행한 후, 광양 태인2교(ED교)의 사재케이블 가설긴장에 성공적으로 적용하였다.

Because MS(Multi-Strand) cables consist of many strands, a jacking force is applied to each strand one by one for cable construction. All strands should have an equal tensile force when the last one is wedged. This is the core technology for MS iso-tensioning. In this study, a new MS cable iso-tensioning system was developed for controlling and jacking the high-strength strands, with an ultimate tensile strength of 2,200MPa, for a stay cable of extra-dosed/cable-stayed bridges. The newly developed iso-tensioning system consists of electrical resistance load cells, hydraulic jacking devices, hydraulic pumps, and integrated controllers. Moreover, it is embedded with an algorithm that can control and predict the variations in tensile forces of the Master and Slave strands in real time. Actual experiments were carried out to verify the function and performance of the newly developed system. This system was applied successfully to the stay cable construction of 2nd Tae-in extra-dosed bridge in Gwangyang.

키워드

참고문헌

  1. Jun J.T., Kim C.H., Kim H.B, Ahn D.G., "A Study on the Development of Iso-Tensioning System for Cable-Stayed Bridges using FBG Sensors", Korean Society of Civil Engineers(KSCE), Proceeding of the Annual Conference of the KSCE, 2010.
  2. Kim H.K., Kim C.H., "Experimental Analysis on Equivalent Tensile Force of Multiple Strand Cable", Korea Institute for Structural Maintenance and Inspection(KISMI), Proceeding of the Spring Conference of the KISMI, 2013.
  3. Ko Y.K, Kim C.H., Chun K.S., Chung K.S., "Application of High Strength Cable and MS Cable Tension System to 2nd Taein Bridge (Extra-Dosed)", Korean Institute of Bridge and Structural Engineers (KIBSE), Proceeding of the Annual Conference of the KIBSE, 2014.
  4. Ko Y.K., Kim C.H., Choi S.C., Jung S.J., Seong T.R., Kim J.K., "Design and Construction of 2nd Taein Bridge(Extra-Dosed) using 2,200MPa MS(Multi-Strand) Stay Cable and 2,400MPa PT(Post-Tensioning) System", Computational Structural Engineering Institute of Korea, Technical Articles, Vol.27, No.3 pp.49-54, 2014.
  5. Yang C.Y., "Principles of Loadcell", Monthly Magazine of Auto Control & Inspection, Special Articles, April, 2002.