Application of Hybrid Ventilation in the Construction of Extra-long Highway Tunnels
The newly built Guilin-Gongcheng-Hezhou Expressway Daguanting Tunnel is 5 642 m long,and the tunnel site area crosses the Ocean Mountain Nature Reserve,and there is no facility for inclined shafts,therefore,whether the construction of the project can be carried out smoothly depends on the effect of construction ventilation.After comparing the commonly used mechanical ventilation methods,combined with the engineering reality of the Daguanting Tunnel,the ventilation method combining press-in and mixed ventilation is finally adopted to adapt to the construction of different stages;By calculating the air volume required for each working condition of the tunnel,the ventilation resistance of the duct,and determining the air supply volume,wind pressure and power of the fan,so as to adapt the construction ventilation fan,and determine the specific construction ventilation plan,it better solves the ventilation problem of lack of pit auxiliary construction in the construction process of the long highway tunnel.
construction ventilationextra-long tunnelsventilation methodsventilation fac-ilities
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