• Title/Summary/Keyword: Sapaesan tunnel

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The Construction of large and Long Tunnel Using Bulk Explosives (벌크폭약을 이용한 대단면 장대터널 시공 사례)

  • 노상림;문상호;조영천;이상필;유지영
    • Explosives and Blasting
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    • v.22 no.3
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    • pp.65-70
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    • 2004
  • Lately, the length of tunnel, the number of long-large tunnel over 3 lanes are steeply increased because of the request for high-speed and straight road. Therefore, the maximization of excavation efficiency is needed in tunnel construction. The sapaesan tunnel (4 lanes with the length of 4km) construction was delayed with environmental conflict far 2 years. For making-up delayed construction period, various new methods were adopted to improve excavation length, look-out and blasting efficiency. This study introduced bulk explosive which is new method in tunnel blasting and verified the efficiency of bulk explosive far long-large tunnel.

A Case Study of Minimizing Construction Time in Long and Large Twin Tube Tunnel (대단면 장대터널 공기단축 사례연구)

  • No Sang-Lim;Noh Seung-Hwan;Lee Sang-Pil;Kim Moon-Ho;Seo Jung-Woo
    • Tunnel and Underground Space
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    • v.15 no.3 s.56
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    • pp.177-184
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    • 2005
  • The Sapaesan tunnel, the longest twin tube tunnel (4km) in Korea with 4 lanes each, is under construction with two years of delayed schedule because of the strong opposition from environmental bodies. Therefore, maximizing the construction efficiency was needed in tunnel project to compensate for time delay. This study includes improvements in the construction of the Sapaesan tunnel such as increasing excavation length and changing excavation sequence. In this paper the system for predicting tunnel face ahead is also introduced. Bulk-Emulsion explosive and Cylinder-Cut method were adopted in tunnel blasting to increase the excavation length. Optimum tunnel excavation step was designed to make up delayed time. Tunnel foe mapping, TSP survey and geological prediction system using computerized jumbo-drill were performed fnr safe construction of long and large twin tube tunnel.

A Study on the Economic Analysis of Disaster Safety Costs by the Water-Bulwark System against the Tunnel Fire (터널 화재진압시스템 도입에 따른 재난 안전비용의 경제성 분석 연구)

  • Chung­Hyun Baek
    • Journal of the Korea Safety Management & Science
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    • v.25 no.2
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    • pp.129-138
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    • 2023
  • This study attempted to analyze the comparative advantage in terms of disaster safety costs in verifying the effectiveness and economic feasibility of the high-performance water-bulwark system in the pole tunnel, which was recently promoted as a part of the acceleration of vehicles. The tunnel to be analyzed was divided into a short tunnel(Anyang, Cheonggye) and a long tunnel(Suraksan, Sapaesan). As a result, it was analyzed that 25% of the improvement effect would occur if one lane was secured by applying the Water-Bulwark System. It was analyzed that this is because the time value cost, which accounts for a large proportion of the traffic congestion cost of short tunnels and pole tunnels, differs depending on the congestion time and traffic volume, not the length of the tunnel.

A Case Study of Panoramic Section Image Collection Method for Measuring Density - with matched images in the Seoul Beltway Sapaesan Tunnel - (밀도측정을 위한 구간영상 최적 수집주기 결정 연구(서울 외곽순환도로 사패산 터널구간을 대상으로))

  • Park, Bumjin;Roh, Chang-Gyun;Kim, Jisoo
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.13 no.4
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    • pp.20-29
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    • 2014
  • Density is applied both three major macroscopic traffic variables (traffic volume, speed, and density) and two measures of effectiveness (MOE) for level of service (LOS) on highway (density and V/C). Especially, it is known for the most accurate MOE on evaluating the LOS of highway. Despite such importance, there is a lack of study on density relatively than other variables for its difficulty of measurement. Existing density estimation methods have some limitations such as density values of same traffic flow vary with collecting time. In this study, we researched actual density measuring method with panoramic image, after each CCTV images in the Sapaesan Tunnel on Seoul Ring Expressway are matched into one panoramic image. Analysis through the Central Limit Theorem shows that density of 24 1 km-images, which means 24 second, applies traffic situation well. That is to say that reasonable density value regardless of collecting time, and practical density which represents actual traffic flow can be taken in case of measuring density by suggested collecting cycle.