• Title, Summary, Keyword: 터널환기

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The Study on Optimum Ventilation System during Long Tunnel Construction (굴착중인 장대터널내 최적의 환기시스템에 대한 연구)

  • Oh, Byung-Hwa;Lim, Han-Uk
    • Explosives and Blasting
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    • v.24 no.2
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    • pp.9-22
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    • 2006
  • In general, tunnel construction except for special cases such as very short tunnels must require an artificial ventilation system. Especially, it is efficient for long tunnels to use the combination of a proper ventilation system according to the progress of the excavation. Neung-Dong Tunnel of which length is 4,580m has been originally designed as using ventilation system of blower and exhaust mixture types. Since it has been expected to result in some problems, its design Is analyzed to find the way to improve ventilation system by estimating the amount of required fresh air, considering various ventilation mixture types, ventilation's fluidity analysis and contaminant's distribution by numerical analysis. Economical efficiency for each type is also reviewed to determine the best ventilation system.

터널환기 관리와 쾌적한 계사환경 유지방안

  • 박세진
    • KOREAN POULTRY JOURNAL
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    • v.36 no.6
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    • pp.100-102
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    • 2004
  • 터널환기의 목표는 냉각이다. 터널방식은 계사내 축적된 열을 제거해도 닭이 편안함을 더 이상 느끼지 못할 때 실시하는 방법이며 아주 무더운 날씨에 풍냉효과를 필요로하여 증발냉각으로 계사내 실제온도를 낮추는 환기모드이다.

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The study of operation mode of ventilation system in the longitudinal ventilation system tunnel (조합환기 방식 터널의 환기기 운전 단계에 관한 연구)

  • Yoo, Ji-Oh;Shin, Hyun-Jun;Lee, Dong-Ho;Lee, Young-hwa
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.4 no.4
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    • pp.343-353
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    • 2002
  • In the past many tunnels have been built to lowest capital investment cost without adequate regard for the cost of operation. But according to increasing the capacity of a ventilation system and to becoming diverse, it is to become more important to come up with the optimal operation stage of ventilation system. In this study, the tunnel ventilation dynamic simulation program had been developed. it is used to calculate the unsteady-state tunnel air velocity and concentration of pollutants according to the assumed average day traffic profile and summarize the energy consumption for the operation of ventilation system. And the operation energy consumption for the electric precipitation system and vertical vent shaft system are evaluated and compared in various operation mode. As the results of this study, the optimal operation stage for these ventilation system are provided.

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A Study on ventilation characteristics in bidirectional traffic tunnels - with emphasis on the natural ventilation (대면통행 터널의 환기특성에 관한 연구 - 자연환기량을 중심으로)

  • Kim, Hyo-Gyu;Hong, Yoo-Jung;Yoo, Yong-Ho
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.6
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    • pp.561-571
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    • 2014
  • The standards of ventilation system for bi-directional tunnel have not been established now. For this reason, with regard to the bi-directional tunnel below 1km, some problems have been appeared in ventilation capacity designing and in determining whether the mechanical ventilation system is needed or not for each case. In this study, we examine the characteristics of natural ventilations, analyze ongoing ventilation design cases for bi-directional tunnels and classify those cases into two groups. This study is carried out about the capability of using natural ventilating system by calculation of reasonable ventilation capacity in bi-directional tunnel and review of relationship between natural wind speed ($Vr^*$) and required speed(Vreq). This paper aims at providing a basis data for bi-directional tunnel ventilation design standards.

A numerical study on the ventilation characteristics of rainfall in road tunnel (강우변화를 고려한 도로터널의 환기특성에 관한 수치해석)

  • Lee, Ho-Hyung;Lee, Seung-Chul
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.3
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    • pp.341-351
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    • 2015
  • When rainfall occurred on road tunnel, that is likely to have influence upon ventilation force in the tunnels but the tunnels ventilation system did not consider factors of rainfall. Thus, this study investigated effects of rainfall upon ventilation force in the tunnels at no rainfall and changing of rainfall by 3 dimensional numerical method. Flow rate into road tunnels decreased as many as 52.34% at rainfall of 150 mm/hr, and pressure drop of road tunnel between entrance and exit decreased as many as 22.22%, so that rainfall had influence upon ventilation force in the tunnel. The number of necessary jet fan in road tunnels is 12 at no rainfall but, when rainfall of 80 mm/hr on road tunnels, the number of necessary jet fan in road tunnels is 16, when rainfall of 150 mm/hr on road tunnels, the number of necessary jet fan in road tunnels is 17. So, factor of rainfall should be considered at estimation of ventilation system of road tunnel.

A Study on ventilation characteristics in bidirectional traffic tunnels - focused on the effects of unequal vehicular speed (대면통행 터널의 환기특성 연구 - 양방향 차등차속의 영향분석을 중심으로)

  • Kim, Hyo-Gyu;Song, Seok-Hun;Lee, Chang-Woo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.7 no.1
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    • pp.13-25
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    • 2005
  • In general, tunnel ventilation is analyzed with the assumption of equal vehicular speed for both directions in bidirectional traffic tunnels. This practice is likely to result in minimizing the piston effects and cannot take into consideration the effects of real situations, since in most cases, speeds of vehicles moving in opposite directions are not equal. Therefore, The ultimate goal of this study is to review the effects of unequal vehicular speeds on the planning of local bidirectional tunnel ventilation. To apply unequal vehicular speed for the bidirectional tunnel ventilation plan, the following requirements are necessary; (1) Adoption of strict smoke concentration standards for 'free-flow & congested' traffic conditions, (2) Selection of an appropriate ratio of heavy directional traffic volume, and (3) Selection of reasonable stepwised magnitude of speed difference. Based on the importance of research topic, this study aims at comparing the differences of the capacity of ventilation equipment for the cases with equal and unequal vehicular speeds in local bidirectional tunnels.

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A Study on a Graphical Method for Determining the Characteristics of Jet-fan Ventilation System using the Contour Map of Required Ventilation Rate in Local Highways (지역별 소요환기량 특성도를 활용한 제트팬 환기방식 가능 터널제원 결정연구)

  • 김효규;김화수;김종대;이창우
    • Tunnel and Underground Space
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    • v.13 no.3
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    • pp.235-243
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    • 2003
  • Recent worldwide trends show that tunnel length is getting longer, and the demand for longitudinal ventilation system with jet-fans in highway tunnels has also increased mainly due to the economic reasons. Improvements in vehicle engine subsequently reduced required ventilation rate(Qreq) which is the decisive factor in choosing the optimal ventilation system. Qreq contour map is a graph that defines the relationship among tunnel length, grade and required ventilation rate. It is important to understand the variation of Qreq in order to evaluate the characteristics of ventilation system with jet fans. Therefore this study aims at studying a graphical method for determining the characteristics of jet-fm ventilation system using Qreq contour map. Also, this study focuses on traffic composition on local highways.

고속도로에서의 환기${\cdot}$방재특성을 고려한 연속터널 설계사례

  • Kim, Yeong-Geun;Kim, U-Seong;Kim, Nam-Yeong;Lee, Ho-Seok;Kim, Il-Hwan
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • pp.47-59
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    • 2004
  • 본 연구에서는 동해고속도로 설계시 나타난 연속터널을 대상으로 하여 터널내 오염농도 해석 및 터널내 오염농도의 거동 및 터널 갱구부 주변의 오염물질의 재유입 여부를 분석하여, 연속터널에 대한 터널내 외부유동에 대한 환기영향을 검증하였다. 또한 연속터널 연결부에서의 캐노피 설치방안, 결빙대책 및 조도순응대책 등을 검토하여 연속터널에서의 환기 및 방재특성을 고려한 합리적인 고속도로설계가 되고자 하였다.

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A study on the ventilation characteristics and design of transverse ventilation system for road tunnel (도로터널 횡류환기방식의 환기특성 및 시스템 설계 관한 연구)

  • Ryu, Ji-Oh;Kim, Hyo-Gyu
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.2
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    • pp.305-315
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    • 2018
  • In this study, the ventilation characteristics and the relationships between the required ventilation flow rate and the ventilation system flow rate was investigated by numerical method for the optimum design of the transverse ventilation and semi-transverse ventilation system in road tunnels. The following results were obtained. In supply exhaust transverse ventilation system, the system supply-exhaust air flow rate is theoretically equal to the difference between the required ventilation flow rate and natural ventilation flow rate. However, it is shown that it increases by about 10% in the analysis results. And, in the case of the longitudinal air flow rate is increased by installed jet fans, ventilation system air flow rate is reduced. However, as the longitudinal air flow rate increases, the concentration of pollutants in the tunnel decreases, so the exhaust effect of pollutants decreases, and the effect of reducing the system air flow rate is decreased. In case of semi-transverse with only air supply, ventilation system air flow rate is equal to required ventilation air flow rate when tunnel inlet velocity is negative, but results is shown it is increased within about 13.3%. Also, it was found that ventilation effect can not be expected even if the jet fans are increased when the tunnel inlet velocity is negative.

A Study on the Natural Ventilation Force in Tunnels (터널형 지하공간내의 자연환기력 분석)

  • Lee, Chang-Woo;Park, Hong-Chae
    • Tunnel and Underground Space
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    • v.19 no.3
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    • pp.226-235
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    • 2009
  • Force induced by the natural ventilation in tunnel is likely to generate adverse influences on the airflow during the normal operation and create even more unfavorable circumstances during the tunnel fire. The influence of the natural ventilation is required to take into account in designing and operating the ventilation as well as safety systems. The magnitude of natural ventilation force depends on a variety of factors associated with the topographical, meteorological and physical features of tunnel. Unfortunately, at this moment those are difficult to quantify and none of the countries has suggested its estimation method in the design guideline. This study aims at quantifying the natural ventilation force at a local highway tunnel by three different methods. The first method employes direct measurement of the pressure at portals, while the second applies a stepwise approach to eliminate the piston effect ahead of deriving the natural ventilation force and the third method uses the concept of barometric barrier.