이동식 믹서를 활용한 광산갱도용 강섬유 혼입 스프레이 콘크리트 시공시스템 제안 = A Study on Sprayed Concrete Construction System using Mobile Mixer in Mine Drift

다국어 초록 (Multilingual Abstract)

Mobile mixer is the machine that has a concrete plant and can produce and supply the designed mix without the limitation of time and place. In this study, steel fiber feeder was developed to apply the sprayed concrete as mine drift support using Mobile mixer, and it was confirmed that steel fiber feeder had the equal performance with the supply equipment in batch plant. There is no difference in strength quality between the produced mix of Mobile mixer and that of batch plant. In the analysis result of construction process, the cycle time of Mobile mixer was reduced by 7.8% compared with that of remicon plant, and the material unit price in case of using Mobile mixer was reduced by 8.7%. So, Mobile mixer will be effective in terms of constructability and economics on condition that it is difficult to construct the standing batch plant in domestic mine.

국문 초록 (Abstract)

이동식 믹서는 콘크리트 플랜트를 차량에 탑재하여 시간과 장소의 제약을 받지 않고, 목표한 품질의 재료를 생산 및 공급할 수 있는 장비이다. 본 연구에서는 이동식 믹서를 활용하여 광산갱도 지보로서 스프레이 콘크리트의 시공 방안을 마련하고자 강섬유 공급장치를 개발하였는데, 기존 배치플랜트의 공급설비와 대등한 성능을 보유한 것으로 나타났다. 또한, 이동식 믹서와 배치플랜트 생산 배합의 강도 품질은 차이가 없는 것으로 확인되었다. 시공공정 분석 결과 이동식 믹서를 활용할 경우 cycle time은 레미콘 공장 구입 방식에 비해 7.8% 정도 공기절감 효과가 있는 것으로 나타났고, 재료 단가도 레미콘 공장 구입 방식에 비해 8.7% 정도 절감되는 것으로 평가되어, 고정적인 배치플랜트 설치가 어려운 국내 광산 특성상 이동식 믹서를 활용하는 것은 시공성 및 경제성 측면에서 효과적일 것으로 판단된다.

참고문헌 (Reference)

1 마상준, "수치해석 및 현장실험을 통한 광산 숏크리트의 적용성에 관한 연구" 한국자원공학회 47 (47): 889-901, 2010

2 구청모, "석회석광산의 갱내채광설계 및 안정성평가" 한국암반공학회 18 (18): 243-251, 2008

3 Korean Tunneling Association, "Tunnel Standard Specification"

4 Korean Tunneling Association, "Tunnel Design Standard"

5 Korean Society of Civil Engineers, "The Study on the Quality Improvement of Shotcrete Lining in Railway Tunnel and the Research on the Actual Condition"

6 Norwegian Tunneling Society & Norwegian Rock Mechanics Group, "Sprayed Concrete for Rock Support-Technical Specification, Guideline and Test methods"

7 Ministry of Land, Infrastructure, and Transport, "Road Construction Standard Specification"

8 EFNARC, "European Specifiation for Sprayed Concrete- Guidelines for Specifiers and Contractors"

9 Korea Institute of Construction Technology, "Development of the Mining Sprayed Concrete and Proposing the Design Strength Classes for Application of the Domestic Mines" Ministry of Trade, Industry and Energy 1-3, 2012

10 Korea Institute of Construction Technology, "Development of Technique for Shotcrete Supporting and Stability Estimation of Large-scale Mine in Soft Ground" Korea Resources Corporation 2008

11 Korea Institute of Construction Technology, "Development of Supporting Application of Ready-mixed Shotcrete in Mine and Estimation of Long Term Durability" Korea Resources Corporation 2009