The construction of the tunnel wind tunnel adopts the brick blasting method, and the transportation vehicles can be either trackless or rail transportation.
When using trackless transportation engineering for construction, there are two key types of pollutants: the category is the smoke caused by engineering blasting, the smoke and dust caused by anchor spraying, and the exhaust gas from internal combustion and slag loading machinery and equipment. The key is concentrated around the palm face and belongs to relative fixed fixed fixed pollutants. Another category is the exhaust gas emitted by diesel vehicles during the entire transportation process, which causes environmental pollution in all tunnels and belongs to the category of fitness and sports pollutants.
Transportation vehicles generally pose a threat to the selection of natural ventilation methods for tunnel construction air ducts.
When the head is alone for a short period of time, using exhaust type natural ventilation, the system software layout and execution key points are the same as those of trackless transportation engineering construction tunnel construction. The characteristics of the tunnel air duct, except for no exhaust emissions, are the same as those of trackless transportation engineering construction tunnel construction
When the single head is long, a hybrid air pressure tunnel construction air duct exhaust system can be selected, or a hybrid positive pressure tunnel construction air duct exhaust system can be selected.
Characteristics of tunnel air duct layout
(1) Fresh air is transferred to the palm face
(2) The smoke exhaust pipe is in fresh gas from the road inlet and outlet to the tunnel edge area
(3) Flexible air ducts can be used for exhaust ducts, and the addition of ducts is easy
(4) Positive pressure smoke exhaust pipes can be used on roads with soft air ducts, but adding them is not easy, so it is necessary to move the smoke exhaust fan together. Air pressure smoke exhaust pipes cannot be used on roads with soft air ducts, as the cost is relatively high
(5) Positive pressure smoke exhaust pipe road ventilation has a negative information effect on natural ventilation, which can lead to pollution, while air pressure smoke exhaust pipe road ventilation cannot find the problem of pollution
(6) Ventilation fans and positive pressure air ducts generate noise pollution inside the tunnel during construction