As a closed and narrow transportation hub, tunnels face multiple problems during maintenance, such as dust accumulation, difficult cleaning of top oil stains, and local high temperatures. Traditional sprinklers can only reach the road surface, and high-pressure water guns are hard to reach the vault. However, the mist cannon machine with 0-90 degree high-angle adjustment function, with the characteristics of “full-angle coverage + precise operation”, has become an innovative equipment for tunnel maintenance.
The core competitiveness of this type of mist cannon machine lies in its freely adjustable angle design: from 0 degrees horizontally to wash and moisturize the road surface, to 90 degrees vertically to aim at the tunnel vault, it can fully cover every space in the tunnel from the ground to the top. Equipped with a special fan-shaped atomizing nozzle, the sprayed water mist can not only form a fine water curtain to suppress dust, but also turn into directional water flow to wash the oil stains on the vault, solving the pain points of traditional equipment that “can’t reach and can’t clean thoroughly”.
In a highway tunnel group maintenance project, due to the high dust concentration (PM10 peak reaching 1.8mg/m³) in 3 tunnels with a length of about 2 kilometers and the difficulty in removing the oil stains from automobile exhaust accumulated on the vault for many years, the operation efficiency of maintenance workers was low, and even respiratory discomfort symptoms appeared. After introducing 4 high-angle mist cannon machines last year, the maintenance mode was completely changed: during operation, the equipment first atomizes and reduces dust on the road surface at a 30-degree angle, then adjusts to a 75-degree angle, and uses high-pressure water mist to impact the vault, flushing the oil stains to the ground for centralized cleaning.
After continuous use for one month, the PM10 concentration in the tunnel was stable below 0.3mg/m³, the removal rate of oil stains on the vault reached 92%, and the maintenance cycle was shortened by 30%. More importantly, the equipment can move flexibly in the tunnel, cooperate with the slow operation of vehicles, without closing traffic, and the daily maintenance road length is increased by 50% compared with the traditional method, which greatly reduces the impact on traffic.
Compared with ordinary tunnel maintenance equipment, the high-angle mist cannon machine has multiple adaptation advantages: the height of the machine body is only 1.2 meters, which can move freely in tunnels with a height limit of 2.5 meters; the angle adjustment adopts hydraulic drive, with fast response speed, and can complete 0-90 degree angle switching within 3 seconds; the size of water mist particles can be precisely adjusted through the control panel, using fine mist for dust and coarse mist for oil stains, and the water saving rate is 40% higher than that of traditional water guns.
In the maintenance of extra-long tunnels, this equipment can give full play to its synergistic value. For example, in tunnels longer than 5 kilometers, 2 mist cannon machines can be responsible for the vault cleaning at a 60-degree angle in the front section and the road dust reduction at a 15-degree angle in the rear section respectively, forming a “3D maintenance assembly line” and greatly improving the operation efficiency. At the same time, in high temperature in summer, the cool water mist sprayed by adjusting the angle to 45 degrees can also reduce the temperature in the tunnel by 3-5℃, creating a comfortable environment for maintenance workers.
The quality of tunnel maintenance is directly related to traffic safety and facility life. The 0-90 degree high-angle mist cannon machine, with its full-angle operation capability, breaks the space limitation of traditional equipment, allowing every inch of the tunnel from the ground to the vault to be carefully cared for. When the water mist draws a precise angle arc in the tunnel, it is not only the reconstruction of cleanliness, but also the double upgrading of maintenance efficiency and safety.
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