The Construction Technology of Subway Large Section Subway Station Construction Channel Picking Top Into the Main Hole Construction Technology

Concealed excavation station as a commonly used way of subway station construction, mainly used in the complex surface environment does not have the conditions of open excavation in urban areas, through the auxiliary channel into the station body for construction. Due to the large cross-section of the subway station, the general auxiliary channel into the station needs to be picked up to find the top of the channel construction, the traditional top of the channel will generally be higher than the station body tunnel, the need to use concrete backfill the gap between the two, the construction cycle is long, over-excavation and backfill volume. In view of the above problems, this paper innovatively puts forward a new construction method of construction channel picking top into the main tunnel, and uses finite element software to simulate the rationality and feasibility of this method. This method adopts two-layer primary arch, i.e. gantry + station main arch arch support, which makes full use of the primary structure of the picket channel, reduces the arch change construction, reduces the amount of over-excavation and backfilling, and effectively ensures the construction period.