深層地下駐車場内における自然換気時の煙濃度分布推定に関する実験的研究-出火階, 地上階の階段扉のみ開放の場合- Experimental Study on Deduction of Smoke from Deep Underground Parking Spaces by Natural Ventilation through Stairwells -In Case of Stairwell of Doors Open at Fire and Ground Floor Only-

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地下4階層の深層地下駐車場の1/10縮尺模型を用い,自然換気状況下で想定火源を乗用車1台として火災実験を行った。メタノール火源から発生する二酸化炭素の流れを煙の流れと見なし,煙濃度分布を推定した。その結果,出火階の平面空間である駐車場内の煙は,自然対流により循環し,空間全体が濃い煙濃度となった。平面空間に比べ階段扉の開口面積が小さいため,階段内の温度は十分に上昇せず,地上階出口での浮力換気による煙排出,空気流入は少なかった。階段扉を開放しても駐車場内の煙濃度分布は,階段扉を閉めた密閉空間とほとんど変わらず,地下4階の平面空間の密閉性が高いことなどがわかった。<br>(オンラインのみ掲載)

In order to make smoke movement of fire clear in a deep underground parking space, a series of experiments were conducted with the 1/10 scale model of the four stories basement under natural ventilation condition. This model consists of four stories parking spaces of relatively large area compartment and two stairwells having vertical shafts. For understanding the smoke movement and the optical density of the smoke, the concentration of carbon dioxide were measured at many points as a substitute for fire smoke. <br>As a result, it was found that carbon dioxide gas was distributed over the large parking space of the fire floor by natural convection, and the optical density of the smoke increased all over the parking space with the lapse of time. The smoke was two layered near fire source, which was thicker in upper layer and thinner in lower layer. On the other hand, in the parking rooms apart from the fire source point, the distribution of the optical density were uniform from the ceiling to the floor. <br>Whereas, the experimental data of carbon dioxide gas concentration were compared between with the prediction by the two layer zone model. The prediction data were larger than the experimental data. But the predictive values normalized by the data near fire source agreed well with the experimental values normalized by that in the parking space, but not in the stairwells.

収録刊行物

  • 日本火災学会論文集

    日本火災学会論文集 46(1), 33-43, 1997-04-30

    日本火災学会

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各種コード

  • NII論文ID(NAID)
    10002685998
  • NII書誌ID(NCID)
    AN0018688X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05460794
  • NDL 記事登録ID
    4247370
  • NDL 雑誌分類
    ZN1(科学技術--建設工学・建設業)
  • NDL 請求記号
    Z16-105
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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