A kind of drilling and blasting method construction tunnel closed press-exhaust combined ventilation system and ventilation method

Abstract

The invention discloses a closed type pressurizing-discharging combined ventilation system and ventilation method for a drilling and blasting construction tunnel. An arranged shielding curtain is divided into a left portion and a right portion which are symmetrically arranged on two sides of a curtain sliding rail and is driven by a curtain motor to slide on the curtain sliding rail, so that the curtain is opened or closed; when the shielding curtain is unfolded, a construction area is relatively isolated from the outside, and accordingly a closed space is formed for the construction area; dueto the fact that an exhaust pipe and an air supply pipe are arranged in the closed space and are both connected with the motor, polluted air in the closed space is exhausted out of the closed space,and outside fresh air enters the closed space through the air supply pipe, so that the air quality in the tunnel rapidly reaches a proper state, and the construction efficiency is improved; a monitorand a gas detector installed at the top of the shielding device can monitor the air quality in the tunnel in real time; and a display screen of the monitor, a display screen of the gas detector and acontrol switch of the motor are arranged at a tunnel opening, so that remote monitoring and remote operation are achieved.

Description

technical field [0001] The invention belongs to the field of tunnel engineering, and in particular relates to a closed ventilation system and a ventilation method for a tunnel constructed by drilling and blasting method. Background technique [0002] At present, my country's tunnel engineering has achieved unprecedented development, and the construction of various long tunnels is in the ascendant, but many problems in the construction process have not been well resolved. For example, when the drilling and blasting method is used to build a mountain tunnel, the construction ventilation problem of the long tunnel, the blasting, spraying and other processes in the construction process will produce a large amount of dust and CO and other substances to pollute the air, but the current tunnel ventilation technology not only A large amount of energy needs to be consumed, and the air quality has not been improved, so this problem cannot be solved well. Therefore, it is urgent to pr...

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Problems solved by technology

First, the patent publication number is CN106285759A. Through the study and research of this patent, the invention does not install a fan to accelerate the discharge of polluted air in the confined space, so that the ventilation time will be increased, and the ventilation effect is difficult to guarantee.

Second, the patent publication number is CN103306702A. In this patent, the airbag is in contact with the second lining of the tunnel to seal the airbag. It takes time to inflate and deflate the airbag. At the same time, the construction environment in the tunnel is harsh, and flying stones are easy to damage the airbag during blasting. The time cost and economic cost of airbag maintenance are high; moreover, the patented shielding device is installed on the second lining trolley, so that the closed space formed can be further reduced, such as installing the shielding device on the waterproof board trolley, further By compressing the range of polluted air, a smaller confined space can achieve better ventilation and smoke exhaust effects; finally, the patent contains a door curtain to allow construction vehicles to pass through, and the opening and closing method of the door curtain is a manual cable. In line with the development trend of modern tunnel automation and mechanization

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