Case study of domestic and overseas applications for TBM in-tunnel disassembly and parts recovery

Dong-Joon Youn; Haejin Lee; Tae-Zin Ahn; Hee-Hwan Ryu; Jung-Joo Kim; Shin-Kyu Choi

doi:10.9711/KTAJ.2025.27.6.505

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2025 Vol.27, Issue 6 Next Page

Technical Paper

Case study of domestic and overseas applications for TBM in-tunnel disassembly and parts recovery 국내·외 TBM 갱내 해체 및 부품 회수 적용 사례 조사

30 November 2025. pp. 505-523

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Abstract

This study investigated domestic and overseas cases of in-tunnel tunnel boring machine (TBM) disassembly, where the machine is disassembled inside the tunnel and subsequently recovered through the rear without a vertical shaft. Specifically, this analysis identified the factors governing the selection of the disassembly method and the essential engineering considerations based on the site-specific conditions encountered in each case. In South Korea, power distribution tunnel construction projects in urban areas, which have a relatively high adoption rate of the mechanized tunneling method, account for the majority of in-tunnel disassembly cases, with their primary purpose being the construction of connecting tunnels that form junctions to the existing operational tunnels or vertical shafts for power cable distribution. As the omission of vertical shafts enables cost reduction and minimizes construction site occupation, while providing various operational advantages including reduced noise and vibration during construction, the adaptation of in-tunnel disassembly is anticipated to increase rapidly in the future. Contrary to the connecting power distribution tunnels shown in the domestic examples, applications in the excavation or extension of transportation and utility tunnels were identified in the overseas cases. With respect to these applications, it was found that in-tunnel disassembly was implement when vertical shaft construction was difficult due to site-specific constraints such as tunnel depth and geometry, water table, construction methods, and adjacent structures. The influencing factors and considerations related to the constraints were analyzed and summarized in this paper.

Keywords

Tunnel boring machine (TBM)

Tunnel junction

In-tunnel disassembly

Parts recovery

Vertical shaft omission

터널굴착기계(tunnel boring machine, TBM)가 도달 수직구 없이 터널 내부에서 해체되고 후방을 통해 반출되는 갱내 해체의 국내·외 사례를 조사하고 각 사례의 제반 조건과 이에 따른 해체 방법 및 주안점을 분석하였다. 국내에서는 기계화 굴착공법의 적용율이 상대적으로 높은 도심지 내 전력구 공사가 갱내 해체 사례의 대부분을 차지하며, 특히 공사가 완료되어 운용 중인 기존 전력구 터널이나 수직구에 분기를 형성하는 접속터널의 시공에 주로 활용되는 특징을 가진다. 이 경우 수직구 생략이 가능하여 공사비 절감과 공사부지 점용 최소화에 더해 공사 과정에서 발생하는 소음 및 진동의 저감 등 여러 공정상의 장점이 있으므로 향후 TBM의 갱내 해체공법 적용 사례가 빠르게 증가할 것으로 예상한다. 터널 내 수용시설 분배를 위한 접속터널 형성을 목적으로 하는 국내 사례와 달리 해외의 경우 교통 혹은 기타 사회 기반 시설용 터널의 굴착과 연장에 다양하게 적용된 사례를 확인하였다. 이와 관련하여 갱내 해체공법이 각 현장의 터널 심도와 형태, 지하수위, 공사방식, 인근 기설 구조물과 같은 공사 여건상의 제약으로 인해 수직구 건설이 어려운 경우에 적용된 점을 확인하고 이에 대한 영향 요소와 주안점을 함께 정리하였다.

키워드

터널굴착기계(TBM)

접속터널

갱내 해체

부품 회수

수직구 생략

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 27
No :6
Pages :505-523
Received Date : 2025-09-10
Revised Date : 2025-11-19
Accepted Date : 2025-11-19
DOI :https://doi.org/10.9711/KTAJ.2025.27.6.505

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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