• Title/Summary/Keyword: 중앙분리대

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A Comparison of Concrete Median Barriers in terms of Safety Performance using Computer Simulation (컴퓨터 모의층돌시험을 통한 콘크리트 중앙분리대 방호울타리 형식별 성능비교 연구)

  • 정봉조;장명순
    • Journal of Korean Society of Transportation
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    • v.21 no.1
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    • pp.115-125
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    • 2003

  • The concrete median barriers are the most popular safety appurtenance that can be installed on narrow medians and are effective in keeping uncontrolled vehicles from crossing into opposing lanes of traffic. It is necessary to install and maintain median barriers because it is very difficult to reserve enough room required for medians in KOREA. Also, concrete median barriers are accepted as the actual alternatives for median barriers, mostly because they require almost no maintenance even after serious collisions. Typical concrete median barriers are 810mm high and have 596mm high glare screens on top of them. However we have experienced a number of "climb" and "roll-over" accidents of heavy vehicles and most of all, there have been some serious accidents caused by the part of broken glare screens. So the improvement study of concrete median barriers started. Prior to this study, a new type of concrete median barrier was suggested which is 1,270mm high and has no glare screens on top of it. So it was required to compare the properties of various types of concrete median barriers including the new type to find the optimal type of concrete median barrier. In this study, we have evaluated the characteristics of four types of concrete median barriers (New Jersey type, F type, constant slope type, and wall type). We have performed many computer simulations for the evaluation of the crashworthiness of them, and through the simulations we have tried to find a proper type of concrete median barrier. Through the computer simulations, we evaluated the structural stability and safety of the four types of concrete median barriers. We confirmed the structural stability and safety of them But in regard to the probability of "roll-over" of heavy vehicles, the higher concrete median barriers showed better performances than the lower. As the result of this study a new type of concrete median barrier was recommended.

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Operational Strategies of a Bus-Exclusive Lane Using Barrier Transfer Systems to Control Tidal Traffic Flows (비대칭적 중방향 교통류 대응을 위한 이동식 중앙분리대 활용 버스전용차로 도입 전략 분석)

  • Kim, Taewan;Chung, Younshik;Jeon, Gyo Seok;Kim, Wongil
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.2
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    • pp.209-217
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    • 2022

  • Lane management with a central variable lane(s) (or reversible lane) where the traffic flow is temporarily reversed in one or more lanes during peak periods has been evaluated as an effective strategy to alleviate congestion caused by tidal traffic flows. However, due to traffic safety issues, such a movable barrier system can be considered as an alternative to supplement the existing its operation facilities such as static and/or dynamic signs and special pavement markings. In addition, when combined with a bus exclusive lane strategy, its effectiveness could be greatly increased. The objective of this study is to propose a feasibility analysis procedure for operational strategies of a bus-exclusive lanes using a barrier transfer system (BTS) for urban expressways. To this end, a case study was conducted on two urban expressways on the west side of the Han River in Seoul. As a result, temporary operation during rush hour in the morning was found to be most effective. The results presented in this study are expected to serve as a basis for establishing bus-exclusive lane operation strategies using similar systems in the future.

  • https://doi.org/10.12652/Ksce.2022.42.2.0209 인용 PDF KSCI

이슈 & 이슈 - 대규모 공공공사 분리발주 법제화 추진

  • 대한설비건설협회
    • 월간 기계설비
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    • s.272
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    • pp.62-66
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    • 2013

  • 대통령직 인수위원회가 지난 2월 19일 중소기업중앙회 강당에서 열린 '중소기업 손톱 및 가시 힐링캠프'에서 대규모의 공공공사 분리발주 등 총 94건을 수용 개선키로 했다고 발표했다. 대통령직 인수위원회는 중소기업계가 꼽은 299건(공익과 상충하는 41건 제외)의 건의사항 가운데 총 94건을 수용 개선키로 한 것이다. 주요 개선과제는 ${\triangle}$정부조달 판로 확대 ${\triangle}$창업 기술규제 현실화 ${\triangle}$대 중소기업 상생 정착 등 총 7개 분야로, 이 가운데 조달부문에서는 전문건설사의 정부 공공공사 직접 참여 활성화를 고려해 대규모 공공공사 분리발주 원칙을 법제화 하는 한편 분할계약 금지 원칙이 담긴 국가계약법 시행령 제68조의 규정을 폐지키로 했다. 인수위의 이같은 결정은 지난 1월 24일 '중소기업 소상공인 현장의 목소리를 듣겠습니다' 간담회에서 대한설비건설협회가 건의한 분리발주 법제화 내용이 반영된 것이다.

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