Study On Smoke Control System In Cross-typed Interchange Subway Station

Transfer station is a junction of the subway line’s net, as the node of the running line, it connects each line link together, played the important role of regulate and distribute passengers and traffic convert. As transfer station is a space of high concentration of passenger flow, coexistence of many equipment systems and multi-modes of transport transition. It contains a large number of disaster factors, once disaster happens, it would lead to heavy casualties and property losses. With multiple platform and the station hall, lots of entrances and exits, station ventilation and smoke control systems design complexity, and when the fire broke out, smoke will spread through the transfer channel between the different lines, which comparded with only one station, it is more complicated. Therefore, transfer station fire safety problem is the technology key and difficult of subway station fire research. So, it is very significant to study smoke diffusion in subway transfer station.In this paper, the study subjects are hujialou station and liuliqiao station, that both are cross-typed interchange subway station. Fire simulated 3d simulation model is set up. Besides multilayer metro transfer station space dimension is big, big depth of the common characteristics of liuliqiao station also has a large area of the platform and station hall; hujialou station interior space division, more functional areas are relatively independent. From different smoke control mode and different fire heat release rate, respectively studies the metro transfer station deep structure and the effect of piston wind effects on the underlying platform spread regularity of fire smoke.The main contents include:(1) According to Beijing, Shanghai, Guangzhou metro cross-typed interchange subway station site survey to select the object.(2) With the method of field measurements, the subway train station under the condition of the piston wind size measurement, measured the piston wind peak can reach 3.5 m/s.(3) Study on the cross-typed transfer station metro deep structure on the influence of the bottom spread of flue gas control platform. By FDS simulation shows that, because of the large change to the embedded depth of fire, the natural wind is difficult, in a closed mechanical air make-up, the underlying platform stairs section a maximum wind speed 0.8-1 m/s. Open mechanical fill after the wind, make up for the problem of insufficient air volume supplied, and supplement the underlying platform stairs cross-section maximum wind speed can reach more than 1.5 m/s.(4) Study on the effect of piston wind effects on the underlying the spread of fire smoke control platform. By FDS simulation shows that the piston wind effect to strengthen the on-site air disturbance, the underlying platform stairs section downward wind speed fluctuations, to speed up the settlement of smoke layer, bad for people evacuation.