Air duct type oxygen supply and ventilation construction method for plateau long and large tunnel

Abstract

The invention relates to the technical field of tunnel construction ventilation, in particular to an air duct type oxygen supply ventilation construction method for a plateau long and large tunnel. Comprising the following steps that S1, construction is conducted on an inclined shaft section, an axial-flow ventilator is arranged at an inclined shaft opening, and fresh air is pressed into an inclined shaft; s2, an oxygen generator is arranged outside the hole, and oxygen is introduced into the ventilation pipe at an air inlet of the axial flow fan; s3, when the inclined shaft is tunneled to the crossing position of the main tunnel and the parallel adit, a wind bin is constructed at the fork; s4, a relay axial flow fan is arranged in the air bin and used for supplying air to the parallel adit face and the main tunnel face; and S5, dust and oil smoke backflow in the main tunnel and the parallel guide hole and are gathered and discharged from the lower air channel of the inclined shaft. The ventilation duct is tight and does not leak air, wind loss can be greatly reduced, air leakage and air leakage can be reduced, it is guaranteed that a draught fan outside a tunnel exerts the maximum work efficiency, long-distance air supply and oxygen supply to a main tunnel parallel guide tunnel face are guaranteed, and the quality of the construction environment in the tunnel is guaranteed. The method is mainly applied to the aspect of air duct type oxygen supply and ventilation of the plateau long and large tunnel.

Description

technical field [0001] The invention relates to the technical field of ventilation in tunnel construction, and more particularly, to a construction method for air duct type oxygen supply ventilation for long and long plateau tunnels. Background technique [0002] With the transfer of the national railway construction scope, a large number of plateau railway lines have been constructed. These tunnels are located in the plateau, with complex geological environment, long single tunnel excavation distance, long auxiliary tunnel distance, and long high temperature section. Coupled with the plateau environment of low pressure, cold and oxygen deficiency in the plateau area, the ventilation of tunnel construction is quite difficult. Especially in the long-distance construction of high-temperature tunnels on the plateau, scientific, efficient, economical and reasonable ventilation methods will be a major factor in the construction of long-scale tunnels in the plateau. technical chal...

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Problems solved by technology

During the construction of the tunnel, a large amount of dust, flue gas, and mechanical exhaust gas cannot be removed in time. Combined with the high temperature and anoxic conditions, water vapor and dust are combined, making the air circulation in the tunnel sluggish, and the working environment in the tunnel is harsh. Insufficient quantity can easily cause hypoxia and fainting of construction workers, insufficient mechanical fuel, and low efficiency of personnel and mechanical operations

Conventional roadway ventilation and press-in ventilation methods cannot meet the ventilation needs of long tunnels on plateaus, and it is difficult to ensure the construction environment in the tunnels

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