Research on Stage Construction Ventilation Scheme for Extra-Long and High-Gas Highway Tunnels
For the construction ventilation of extra-long tunnels,it was mostly to use auxiliary tunnels such as inclined shafts and cross tunnels as exhaust ducts for roadway ventilation in the past.However,for the construction ventilation of high-speed highway separated high-gas long tunnels without auxiliary tunnels,the risks are higher and the experience is scarce,which needs further research.Therefore,combined with the high-gas Zongbaoshan Tunnel project of the Tongzi-Xinpu Expressway,the stage construction ventilation plan is studied.Practice shows that by innovatively adopting the'tunnel waste backfill+solid brick+sprayed concrete sealing'air door setting,the fans,transformers,backup power supplies and other equipment can be equipped according to the non-explosion-proof type entrance;through the cleverly designed air door form and location,using a section of the separated tunnel as a ventilation roadway and the other section of the tunnel as a pressurized ventilation equipment installation channel,this'roadway+pressurized'ventilation method is simple to construct,low in cost,and effectively solves the ventilation problem of long-distance high-gas tunnels,ensuring construction safety.The relevant experience is worth learning.
high gashighway tunnelstage constructionventilation planair door
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