Comb-type construction channel of ultra-large-section subway station

The invention discloses a comb-type construction channel of an ultra-large-section subway station. The comb-type construction channel comprises a main channel leading to a lower layer of a subway station main body. Along with gradual inclination and descending of the main channel elevation, a first branch channel, a second branch channel and a third branch channel are at least sequentially distributed. The first branch channel is connected with an upper layer of the station main body, and the second branch channel is connected with a middle layer of the station main body. The third branch channel is connected into an existing station entrance-exit in a counter-trend uphill mode, and then enters the upper layer of the subway station main body from the station entrance-exit. The first branchchannel and the third branch channel are connected with the large mileage end and the small mileage end of the upper layer of the station main body correspondingly. The main channel is divided into the at least three branch