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(경기=브레이크뉴스 경기동북부)하인규 기자=경기도가 지난 4월 붕괴사고가 발생한 신안산선 터널과 같은 2-Arch 공법이 적용된 도봉산~옥정 광역철도 2공구 103정거장 터널에 대해 전문가 자문과 설계 및 시공상의 안정성을 점검했다고 15일 밝혔다.
점검에는 경기도 철도건설기술자문위원 가운데 ▲토목구조 ▲토질 및 기초 ▲토목시공 ▲터널 ▲품질안전분야 전문가들이 참여해 2-Arch 터널의 설계 및 시공의 적정성, 해당공법의 위험요소 사전 검토를 통한 추가 안전성 확보 방안 등을 논의했다.
점검단은 도봉산~옥정 광역철도 2공구 건설공사에도 2-Arch 터널의 문제를 동일하게 적용해 위험사항들에 대한 비교 분석, 시공과정에서 발생할 수 있는 문제점 등을 심도있게 검토 논의했다.
도의 자문 결과에 따르면, 103정거장 구간은 중앙기둥 및 라이닝 구조물의 축하중강도와 휨강도 등 구조 계산 결과 모두 충분한 안전율을 확보하고 있으며, 시공 중 계측기의 변위값도 관리 기춘치를 만족하는 것으로 확인됐다.
특히, 신안산선 사고를 반면교사 삼아, 보다 강화된 안정성 확보 방안을 현장에 적용하기로 했다. 터널을 지탱하는 숏크리트 강도를 상향(21Mpa→35Mpa)하고 일부 구간은 기계굴착으로 전환했으며, 중앙기둥에는 응력계를 추가 설치하고 주요 계측기의 설치 간격을 줄여 계측의 정밀도를 강화했다. 또한, 측압 대응을 위한 좌·우측 막장면 이격거리 관리, 비상시 단계별 대응방안 마련, 모의훈련 등 유사 사고 예방을 위한 실질적인 현장 대응 조치도 함께 추진됐다.
김기범 경기도 철도항만물류국장은 “점검을 통해 2-Arch 터널의 사고 위험을 사전 제거하고, 안정성 확보를 위한 추가 대책 수립이 큰 의미”라며 “‘안전 최우선’ 원칙하에 철저한 시공관리와 모니터링을 지속해 안전사고 예방에 만전을 다하겠다”고 말했다.
하인규 기자 popupnews24@naver.com
아래는 위의 글을 구글번역이 번역한 영문의 전문이다. '구글번역'은 이해도를 높이기를 위해 노력하고 있습니다. 영문 번역에 오류가 있을 수 있음을 전제로 합니다.Below is the full English translation of the above text by Google Translate. 'Google Translate' is working to improve comprehension. It is assumed that there may be errors in the English translation.
Gyeonggi-do, Dobongsan~Okjeong Metropolitan Railway 2nd Section 2-Arch Tunnel Design and Construction Stability Inspection
Gyeonggi-do Railway Construction Advisory Committee participates in the inspection of the Dobongsan~Okjeong Metropolitan Railway 2-Arch Tunnel construction project
- Reconfirming the stability of the 2-Arch tunnel through review of the appropriateness of the design and construction of 103 stations
- Establishing expanded and reinforced measures for measurement and preemptively introducing an emergency response system to establish a foundation for safe construction
- Reporter Ha In-gyu
(Gyeonggi=Break News Gyeonggi Northeast) Gyeonggi-do announced on the 15th that it received expert advice and inspected the design and construction stability of the 103 Station Tunnel of the Dobongsan~Okjeong Metropolitan Railway 2nd Section 103 Tunnel, which uses the same 2-Arch method as the Shin Ansan Line tunnel that collapsed last April.
The inspection was attended by experts in ▲civil engineering structure ▲soil and foundation ▲civil engineering construction ▲tunnel ▲quality and safety from among the Gyeonggi-do Railway Construction Technology Advisory Committee, who discussed the appropriateness of the design and construction of the 2-Arch tunnel, additional safety measures through a preliminary review of the risk factors of the relevant construction method, etc.
The inspection team applied the same problem of the 2-Arch tunnel to the construction project of the Dobongsan~Okjeong metropolitan railway section 2, and thoroughly reviewed and discussed comparative analysis of risk factors and problems that may arise during the construction process.
According to the results of the provincial advisory, the 103-station section secured sufficient safety factors in the structural calculation results, such as the axial load strength and bending strength of the central column and lining structure, and the displacement values of the measuring instruments during construction were also confirmed to satisfy the management reference values.
In particular, it was decided to apply a more strengthened safety securing measure to the site, taking the Shin Ansan Line accident as a negative example. The strength of the shotcrete supporting the tunnel was increased (from 21 MPa to 35 MPa), and some sections were converted to mechanical excavation. A stress gauge was additionally installed on the central pillar, and the installation interval of the main measuring instruments was reduced to enhance the precision of the measurement. In addition, practical on-site response measures were also implemented to prevent similar accidents, such as management of the distance between the left and right face faces to respond to lateral pressure, preparation of a step-by-step response plan in case of an emergency, and mock training.
Gyeonggi-do Railway Port Logistics Bureau Director Kim Ki-beom said, “It is very meaningful to eliminate the risk of accidents in the 2-Arch tunnel in advance through inspection and establish additional measures to ensure stability,” and “We will continue to conduct thorough construction management and monitoring under the principle of ‘safety first’ to do our utmost to prevent safety accidents.”
원본 기사 보기:브레이크뉴스 경기동북부
