Water stop structure for four-pilot-hole PBA construction method

The utility model relates to the technical field of underground space excavation and support, in particular to a water stop structure for a four-pilot-hole PBA construction method. The water stop structure for the PBA construction method of the four pilot tunnels comprises a plurality of occlusive piles, the occlusive piles are divided into two groups and extend downwards from pilot tunnels in thetwo sides of the PBA construction method, and the two groups of occlusive piles are used for forming two side wall water stop bodies; the freezing pipes extend downwards from the interior of the PBAstation main body structure and are arranged between the two side wall water stop bodies, and the lower ends of the freezing pipes are used for local freezing to form a freezing bottom plate; and thefreezing bottom plate is arranged between the two side wall water stop bodies. The water stop structure for the PBA construction method for the four pilot tunnels can be effectively integrated with the PBA construction method,