Assembled special-shaped air duct for long-distance construction ventilation of tunnel and construction method

Abstract

The invention discloses an assembled special-shaped air duct for a long-distance construction ventilation of a tunnel and a construction method. The assembled special-shaped air duct for the long-distance construction ventilation of the tunnel and the construction method aim at effectively increasing the air supply area, increasing the ventilation distance, reducing the increase of a section, increase of an auxiliary shaft or increase of a service gallery due to the need of ventilation and effectively reducing the engineering investment. The customized special-shaped air duct allowing fresh air flowing outside the tunnel to pass through is fixedly installed on the upper middle parts of the service gallery, a right-line main tunnel, a transverse channel and a left-line main tunnel or a parallel pilot tunnel, end partition plates are arranged on the end openings, close to the right-line main tunnel, the left-line main tunnel or the excavation face of the parallel pilot tunnel, of the prefabricated air ducts to form air bins, press-in draught fans and air pipes leading to the excavation surface of the tunnel are installed outside the air bins, the customized special-shaped air duct isformed by splicing customized light air duct unit sections in a longitudinal butt joint mode, the customized light air duct unit sections are supported on supporting components which are arranged atintervals in the longitudinal direction, the two ends of the supporting components are detachably connected with tunnel lining structures or tunnel primary supporting structures of the service gallery, the right-line main tunnel, the transverse channel or the left-line main tunnel or the parallel pilot tunnel.

Description

technical field [0001] The technology of the invention belongs to the engineering fields of railway tunnels, highway tunnels and municipal tunnels, and in particular relates to an assembled special-shaped air duct for long-distance tunnel construction ventilation. Background technique [0002] With the improvement of the country's economic level, more and more railways are being or will be planned and constructed, especially in the western region of my country. Due to the complex terrain, geological conditions and line direction requirements, there will be a large number of extra-long tunnels, which will become the key to control the construction period of the entire line. Even affect the line plan. [0003] At present, most of the railway mountain tunnels are constructed by drilling and blasting method. In order to ensure the normal construction environment in the tunnel, protect the physical and mental health of the operators, and the safety of life and property, ventilatio...

AI Technical Summary

Problems solved by technology

The air supply capacity of the ventilation equipment is closely related to the size of the air duct and the power of the fan. However, during the process of sending the air from the air duct to the excavation surface, due to the inevitable air leakage of the air duct, the air volume along the way is continuously lost, so excavation is required. When the surface air volume is the same, the longer the air transport distance, the greater the air volume required by the fan, and the greater the wind pressure, so there is an economical ventilation distance. When the distance reaches a certain length, ventilation cannot be achieved under the existing equipment needs

[0004] In order to shorten the construction period and meet the construction ventilation requirements, auxiliary tunnels will be set up in super-long tunnels to shorten the length of the tunnel and shorten the ventilation distance. In the plateau area, the efficiency of the fan is reduced, and the wind supply capacity is reduced. The conventional air duct press-in ventilation is difficult to meet or the auxiliary tunnel section needs to be expanded, but the investment will increase significantly.

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