Combined construction method of air return vertical shaft permanent fore shaft and fan drift piling wall

Abstract

The invention relates to a combined construction method of an air return vertical shaft permanent fore shaft and a fan drift piling wall, and belongs to the technical field of mine ventilation. According to the construction method, the mode of combining open excavation and underground excavation is mainly adopted, foundation pits of a fan drift and a shaft are subjected to open excavation, after aroof of the fan drift and part of the shaft are cast, the foundation pits can be subjected to open excavation, and a hoisting system in the shaft is installed; afterwards, the fan drift and the shaftare subjected to underground excavation. According to the construction method, the occupied area is small, which is beneficial for early work starting of other permanent civil engineering facilitieswithin the air return vertical shaft wide range, and the overall construction speed of engineering projects is increased; the safety risks that deep foundation pit slopes are unstable and personnel are in the high-position working state for a long term are avoided to a certain degree, the cost expenditure for earth excavation of the deep foundation pits under open excavation, intensive supports and high and large scaffolds is effectively reduced, and the cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of mine ventilation, and relates to a construction method, in particular to a joint construction method of a permanent lock of a return air shaft and an air tunnel pile wall. Background technique [0002] The mine ventilation system is responsible for delivering fresh air to underground construction sites and chambers, creating a relatively comfortable environment for operators and discharging toxic and harmful gases. 3.1.6 of "Coal Mine Design Specifications" stipulates that "high gas mines, mines with coal (rock) and gas (carbon dioxide) outburst hazards must be equipped with special return air shafts", and Article 87 of "Coal Mine Safety Regulations" stipulates that " The return air shafts of newly built and expanded mines are strictly prohibited from being used as lifting shafts and pedestrian passages.” Article 147 of the “Coal Mine Safety Regulations” stipulates that “newly built high-gas mines, outbur...

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Problems solved by technology

[0004] The construction of the wind tunnel is usually carried out after the construction of the shaft shaft is completed. During the construction of the shaft lock section, a 1-2m tunnel opening is reserved, or no tunnel opening is left (the shaft wall of this section will be removed later); when the shaft sinking construction is completed , take the method of open-cut construction, slope construction or sheet pile support for the foundation pit; then set up tall scaffolding and brackets, pour concrete from bottom to top, and finally backfill soil to cover the roof of the wind tunnel; this method requires a large site range 1. The maintenance workload of deep foundation pits is heavy, and personnel work at heights for a long time. At the same time, it is necessary to do a good job of preventing objects from falling into the shaft. Safety control is difficult, and the construction period is relatively long; and when the derrick foundation and the wind tunnel are in the When there is an overlap in the plane position, the wind tunnel construction must be started after the derrick is removed, which further prolongs the time for the permanent ventilation system of the mine to be put into operation

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