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

Abstract

The invention discloses an integral special-shaped air duct for tunnel long-distance construction ventilation and a construction method. According to the air duct and the construction method, the airsupply area is effectively increased, the ventilation distance is increased, the increase of a section, the addition of auxiliary wells or the addition of auxiliary galleries and the like due to the need of ventilation are reduced, and the engineering investment is effectively reduced. The air duct is characterized in that the integral special-shaped air duct formed by concrete formwork building is arranged in an auxiliary gallery, and the integral special-shaped air duct is composed of an arch part, a side wall part and a horizontal plate, wherein the arch part and the auxiliary gallery are subjected to formwork building lining, and the horizontal plate divides the section into an upper special-shaped air bin and a lower channel; and the far end, close to a right line main tunnel, of theintegral special-shaped air duct is provided with a vertical partition plate for sealing the upper isolation air bin, air supply holes are formed in the vertical partition plate at intervals, and press-in fans and air pipes for guiding fresh air to the excavation face of the right line main tunnel, a left line main tunnel or a parallel pilot tunnel are arranged outside the air supply holes.

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 integral special-shaped air duct for ventilation in long-distance tunnel construction. 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, ventilat...

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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