为保证地铁地下车站站台或轨行区火灾时站厅公共区域的安全,调研现阶段保证站厅到站台楼梯或扶梯口处具有不小于 1.5 m/s 向下气流采取的技术措施,主要有排烟控制方式和防烟空气幕,分析排烟控制方式设计过程中的流速与过流断面面积,认...为保证地铁地下车站站台或轨行区火灾时站厅公共区域的安全,调研现阶段保证站厅到站台楼梯或扶梯口处具有不小于 1.5 m/s 向下气流采取的技术措施,主要有排烟控制方式和防烟空气幕,分析排烟控制方式设计过程中的流速与过流断面面积,认为排烟控制系统中的流速为断面的平均流速,过流断面为站台楼扶梯入口段截面,提出站台除楼扶梯洞口外,不应开设其他门窗洞口,楼扶梯两侧应封闭以及采用辅助排烟的方式增加站台排烟量等技术措施。通过分析防烟空气幕系统的优缺点,得出采用防烟空气幕时,站台区域应设置机械补风系统,补风量不应小于排烟量的 50%,同时开启站台排烟系统。以期为保证地铁地下车站站厅公共区的安全性,选择适用性强、安全及可靠性高、经济合理的技术措施提供参考依据。展开更多
In high-rise building fires, the most immediate threat to passenger life and safety evacuation is the smoke inhalation. Some traditional models for smoke prevention and exhaust are analyzed and compared with the smoke...In high-rise building fires, the most immediate threat to passenger life and safety evacuation is the smoke inhalation. Some traditional models for smoke prevention and exhaust are analyzed and compared with the smoke-preventing air curtain. The rationality and the feasibility of the air curtain are theoretically expounded. The air volume, tuyere width and jet velocity in the air curtain experiment are designed according to the theoreti- cal calculation model. Experimental results indicate that the effect of air curtain to prevent smoke diffusion is re- markable as the volume ratio of air-smoke is about 0. 6, the jet angle is between 25^o and 35^o, and the jet thickness is between 25 mm and 45 mm. The efficiency of air curtain can reach 98% on the entraining effect. Meanwhile, experiments verify the theorectical calculation.展开更多
文摘为保证地铁地下车站站台或轨行区火灾时站厅公共区域的安全,调研现阶段保证站厅到站台楼梯或扶梯口处具有不小于 1.5 m/s 向下气流采取的技术措施,主要有排烟控制方式和防烟空气幕,分析排烟控制方式设计过程中的流速与过流断面面积,认为排烟控制系统中的流速为断面的平均流速,过流断面为站台楼扶梯入口段截面,提出站台除楼扶梯洞口外,不应开设其他门窗洞口,楼扶梯两侧应封闭以及采用辅助排烟的方式增加站台排烟量等技术措施。通过分析防烟空气幕系统的优缺点,得出采用防烟空气幕时,站台区域应设置机械补风系统,补风量不应小于排烟量的 50%,同时开启站台排烟系统。以期为保证地铁地下车站站厅公共区的安全性,选择适用性强、安全及可靠性高、经济合理的技术措施提供参考依据。
文摘In high-rise building fires, the most immediate threat to passenger life and safety evacuation is the smoke inhalation. Some traditional models for smoke prevention and exhaust are analyzed and compared with the smoke-preventing air curtain. The rationality and the feasibility of the air curtain are theoretically expounded. The air volume, tuyere width and jet velocity in the air curtain experiment are designed according to the theoreti- cal calculation model. Experimental results indicate that the effect of air curtain to prevent smoke diffusion is re- markable as the volume ratio of air-smoke is about 0. 6, the jet angle is between 25^o and 35^o, and the jet thickness is between 25 mm and 45 mm. The efficiency of air curtain can reach 98% on the entraining effect. Meanwhile, experiments verify the theorectical calculation.
