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Improvement of existing drainage system for leakage treatment in exiting underground structures

운영중인 지하구조물의 누수처리를 위한 유도배수공법의 개선

  • Kim, Dong-Gyou (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Yim, Min-Jin (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 김동규 (한국건설기술연구원 지반연구소) ;
  • 임민진 (한국건설기술연구원 지반연구소)
  • Received : 2017.07.20
  • Accepted : 2017.07.28
  • Published : 2017.07.31

Abstract

The objective of this study is to propose a modification of the previously proposed drainage system for catching the partial leakage of underground concrete structures. Two techniques were proposed for applying the drainage system only to the leaking parts. One was for conveying leaking groundwater to the collection point in the drainage system and the other was for conveying the collected groundwater to the primary drainage system of the underground concrete structure. Four waterproofing materials for conveying leaking groundwater to the catchment point of the drainage system, Durkflex made of porous rubber material, KE-45 silicone adhesive with super strong adhesion, Hotty-gel made of polymeric materials and general silicone adhesive were evaluated for waterproofing performance. Hotty-gel only showed perfect waterproof performance and the other three waterproof materials leaked. The modified drainage system with Hotty-gel and drainage pipe with fixed saddle to convey the leaking groundwater from the catchment point to the primary drainage system were tested on the concrete retaining wall. The waterproof performance and the drainage performance were evaluated by injecting 1,000 ml of water in the back of the modified drainage system at the 7-day, 14-day, 21-day, 28-day, 2-month and 3-month. There was no problem in waterproof performance and drainage performance of the modified drainage system during 3 months. In order to evaluate the construction period and construction cost of the modified drainage system, it was compared with the existing leaching repair method in surface cleaning stage, leakage treatment stage, and protective barrier stage. Total construction period and construction cost were compared in considering the contents of work, repair material, construction equipment, working time, and total number of workers. As a result of comparing and analyzing in each construction stage, it was concluded that the modified drainage system could save construction period and construction cost compared to the existing leaching repair method.

Acknowledgement

Grant : 한랭지역 기존 도로터널의 동결 피해 저감 기술 개발

Supported by : 국토교통과학기술진흥원

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