Study On Airflow Control And Station Affairs Organization Of Urban Rail Transit Underground Station To Restrain Epidemic Spread

At present,the fully enclosed screen doors in underground stations of urban rail transit ensure the temperature in the station and reduce the energy consumption of the air-conditioning system during the air-conditioning season.At the same time,it also brings the problem of insufficiency of air in the station.It is difficult to ensure the air quality in the station only by relying on fresh air fans.Especially in public health emergencies,a large number of passengers gather and disperse in underground stations of urban rail transit,and the enclosed environment becomes a hotbed for cross-infection of infectious diseases.This paper proposes methods such as delaying the closing of sliding screen doors,rational use of piston wind,and effective adjustment of passenger flow organization measures,to increase the ventilation in underground stations of urban rail transit,and ultimately achieve the goal of reducing the risk of infection during the outbreak of infectious diseases.The main research contents of this paper are as follows:Through the research on the transmission characteristics of traditional respiratory infectious diseases and the prediction model of infectious diseases,we have constructed an infection probability model that is suitable for urban rail transit underground stations such as closed and large flow of people.Through simulation and analysis,it is obtained that the main infection probability is affected.Affected by the types of respiratory infectious diseases,indoor ventilation,exposure time and the number of people exposed.Among them,the type,exposure time,and number of people exposed to respiratory infectious diseases should not be controlled.Therefore,reducing the risk of infectious disease infection by increasing indoor ventilation is the simplest and most operative method.Through the analysis of existing urban rail transit underground station ventilation measures,measures to open or delay the closing of sliding screen doors in advance are proposed to fully utilize the piston wind generated when trains enter and exit the station to increase the fresh air volume in the station,and the general calculation model of increasing the fresh air volume is summarized.Based on the analysis of passenger flow and geographical location in different stations of Xuzhou Metro,Xuzhou East Station of Line 1 of Xuzhou Metro is finally selected as the research object.Fluent software is used to simulate the change law of the air pressure under the sliding screen door during the train entering and leaving the station,so as to solve the new air volume that can be introduced.According to the fresh air standard of 30 m~3 per hour for each person in the infectious disease ward,the ventilation scheme of the new station meeting the fresh air standard is set up.Based on passenger flow,peak hour and peak hour are divided into five control stages,and a four-stage air flow control scheme is proposed.Through the analysis and comparison of the simulation data between the four-stage new ventilation control scheme and the traditional ventilation method,it can be seen that the four-stage new ventilation scheme can significantly reduce the risk of infectious disease infection.In addition,through to the sudden large passenger flow or emergency evacuation are studied,after summarizing the existing traffic organization scheme and affair organization work,on the basis of proposed four merry adapted to this organization plan affair organization work,has been clear about the station staff responsibility adjustment and equipment configuration.There are 47 figures,23 tables and 111 references in this paper.