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A study on the development and performance evaluation of duct coupling for the minimized leakage of temporary ventilation duct

공사 중 환기덕트 누풍 최소화를 위한 접속부 개발 및 성능평가 연구

  • Received : 2017.12.07
  • Accepted : 2018.01.05
  • Published : 2018.01.31

Abstract

Long subsea tunnel is subject to many restrictions in terms of spatial limitation when vertical or inclined shafts are built for tunnel ventilation. So, the construction of some artificial island is required to provide ventilation. But, because of construction difficulty and cost increase, it is necessary to minimize the artificial island construction. As a result, ventilation distance become longer and supply airflow becomes excessive due to air leakage, So, duct mounting for temporary ventilation is impossible or fan pressure and power increase exponentially. Therefore, in order to build a long subsea tunnel, it is necessary to overcome these practical problems and to develop technical solution that can keep the comfortable condition of tunnel environment during construction. In previous study, we have found that air leakage is the key factor in solving these problems and experimental results show that the new connection method has a leakage rate of about $1.46mm^2/m^2$ (Jo et al., 2017). In this study, we present the experimental results of the measurement of the leakage rate of the prototype with the new connection method, and analyze experimentally the improvement of the leakage rate when applying the flexible cover inside the duct to improve the leakage performance of the existing connection method.

Acknowledgement

Grant : 고수압 초장대 해저터널 기술 자립을 위한 핵심요소 기술개발

Supported by : 국토교통과학기술진흥원

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