Development and Demonstration of ITPC Tunnel Ventilation Slab System

Do Gyun Kim; Jong Hoon Moon; Ju Hyun Park

doi:10.22725/JSRP.2025.3.1.17

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2025 Vol.3, Issue 1 Preview Page Next Page

Technical Note

Development and Demonstration of ITPC Tunnel Ventilation Slab System ITPC 풍도슬래브 시스템 개발 및 실증

30 June 2025. pp. 17-25

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Abstract

This study introduces the ITPC (Integrated Tunnel & Pre-Cast)-Slab system, a new tunnel ventilation slab structure using mechanical keys instead of traditional bracket support. The system aims to overcome fire resistance limitations, structural inefficiencies, and maintenance issues in deep urban tunnels. It features a horizontal key-based joint that simplifies installation, minimizes bracket size, and enhances structural integrity. Performance tests confirmed its superior fire resistance, withstanding 2.6 to 2.7 times the design load. Material consumption was significantly reduced—up to 76% in prestressing steel. The design also allows extended slab spans up to 27 m without center supports. Simplified lifting and installation improve maintenance efficiency. It has been applied to the Namhae-Yeosu subsea tunnel project.

Keywords

ITPC-SLAB

key joint

fire resistance

long-span

material reduction

본 연구는 기존 브라켓 얹힘 방식 대신 결합키를 활용한 수평 연결 방식의 ITPC-Slab 시스템을 제안한다. 이 시스템은 내화 성능 강화, 유지관리성 향상, 장연장 시공 문제 해결을 목표로 한다. 결합키 구조는 시공을 단순화하고 구조적 안정성을 높이며, 브라켓 및 라이닝 물량을 줄인다. 실물시험 결과 설계 모멘트의 2.6~2.7배에서도 균열이 발생하여 높은 안정성이 입증되었다. 자재 사용량도 최대 76%까지 절감되었고, 27 m 장연장 시공도 가능하다. 남해-여수 해저터널에 최초 적용되었으며, 향후 대심도 지하차도에의 확대 적용이 기대된다.

키워드

ITPC-SLAB

결합키

내화성능

장연장

자재 절감

References

Bang, S. H., Jo, E. J., Kim, W. J., Jang, K. S. and Kim, D. G. (2025) DL E&C's Smart Construction Strategy and Achievements in Civil Engineering-Focusing on Tunnel Productivity Improvement. Journal of Korean Society of Civil Engineers 73(3), 42-51. (In Korean)

Jung, S.H., Yoon, S.P. (2013) Recent Case Studies and Future Outlook on Deep Underground Space Development, Domestically and Globally. Journal of Ssangyong E&C 69, 28-43.

Kim, D. G., Moon, J. H., Ha, T. Y. and Park, J. H. (2024) Integrated Tunnel & Pre-Cast-Slab-Bracket System(Joint Structure of Airduct Slab using Coupling Key). Journal of Korean Society of Civil Engineers 72(3), 102-105. (In Korean)

Ministry of Land, Infrastructure and Transport (2021) Fire Protection Design Guidelines for Road Tunnels (April 2021). MOLIT, Sejong, Korea. (In Korean)

Information

Publisher :Korean Institute of Bridge and Structural Engineers
Publisher(Ko) :한국교량및구조공학회
Journal Title :Journal of Structure Research and Practice
Journal Title(Ko) :한국교량및구조공학회 논문집
Volume : 3
No :1
Pages :17-25
Received Date : 2025-05-09
Revised Date : 2025-06-19
Accepted Date : 2025-06-24
DOI :https://doi.org/10.22725/JSRP.2025.3.1.17

Journal of Structure Research and Practice ISSN:3022-4241(Print) 3022-7267(Online) 한국교량및구조공학회 논문집

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