Construction system is secretly dug at station

The utility model discloses a construction system is secretly dug at station, include two sets of pilot tunnels (1) of locating the middle part and divide pilot tunnel (2) of locating both sides that pilot tunnel (1) and pilot tunnel two (2) all includes upper and lower portion's pilot tunnel and pass through center pillar (3) and skirt piles (4) fixed stay respectively, characterized by: connect center pillar (3) outside back -up sand of the upper and lower portion pilot tunnel of pilot tunnel (1), adjacent pilot tunnel (1) and pilot tunnel are equipped with arched longeron (7) between two (2), be equipped with steel -pipe column (5) that are used for supporting top longeron (7) in the upper portion pilot tunnel of pilot tunnel (1), push up concrete (6) of clearance for backfilling of longeron (7) and pilot tunnel, be equipped with between steel -pipe column (5) of adjacent two sets of pilot tunnels (1) reinforcing pull rod (8). This construction system is secretly dug at station adopts step method excavation and the construction method that the pilot tunnel combined together, has not only improved the construction progress greatly, has also reduced stratum moisture infiltration simultaneously, has guaranteed construction safety.