Air duct transformation and communication construction method for subway air shaft

Abstract

The invention discloses an air duct transformation and communication construction method for a subway air shaft. The method comprises the following steps: 1, cutting a part of an overground structure of an original air shaft (10); 2, an original air shaft is partially closed, and a top ventilation structure (11) and a side ventilation structure (12) are arranged; 3, a fresh air shaft (20) is constructed, and an air shaft communication area (30) is reserved between the fresh air shaft (20) and the original air shaft; 4, completely covering the communicating part of the original air shaft and the air shaft communicating area through a retaining wall (101) and an isolating plate (102) in the original air shaft; 5, constructing an air shaft communicating area and a communicating part of the air shaft communicating area and the original air shaft; 6, the retaining wall is dismantled, the original air shaft, the air shaft communication area and the fresh air shaft are communicated, and the original air shaft is completely sealed; and 7, removing the overground part of the original air shaft, and constructing upper waterproof and earthwork backfilling. By reserving part of the structure and ventilation function of the original air shaft, safe construction of the fresh air shaft and the air shaft communication area is guaranteed, the air duct communication transformation construction period is shortened, and subway operation is not affected.

Description

technical field [0001] The invention relates to a renovation method of a ventilation and exhaust system, in particular to a construction method for renovation and connection of an air duct of a subway air shaft. Background technique [0002] The subway is an important part of urban transportation. Most subway lines run underground. In order to meet the ventilation and exhaust requirements of underground platforms and station halls, there are usually multiple air pavilions outside the main body of the subway structure. The air pavilions pass through the air shafts. It is connected to the air chamber in the main body of the subway structure to realize ventilation and exhaust. Due to land planning or structural transformation, subway air shafts need to undergo air duct reconstruction, that is, excavate and build new air shafts near the original air shaft, and change the direction of the air duct from the original air shaft to the new air shaft. The existing construction method...

AI Technical Summary

Problems solved by technology

This construction method limits the ventilation and exhaust functions of the subway and affects the normal operation of the subway. In addition, during the excavation of the new air shaft, due to the heavy load of the original air shaft, the excavation and construction of the new air shaft adjacent to the original air shaft There are large safety hazards, and the original wind shaft needs to be reinforced, which is difficult to reinforce and requires the approval and cooperation of the subway unit, which seriously affects the progress of the construction period

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