Drilling device of anchoring structure in deep foundation pit

The utility model discloses a drilling device of an anchoring structure in a deep foundation pit, which comprises a power structure and a drilling structure, and the drilling structure is arranged at the output end of the power structure. The drilling structure comprises a main drill rod and a flexible drill rod, the flexible drill rod is movably arranged in the main drill rod, and the main drill rod and the flexible drill rod are both connected with the power structure. The flexible drill rod is arranged in the straight drill rod, the side face bent hole is drilled in the side wall of the grouting hole through the flexible drill rod, grout flows into the bent hole during grouting, and after the grout is solidified, the anchoring range of an anchor cable can be enlarged, the anti-pulling strength can be improved, the anchoring strength can be further improved, and the safety of foundation pit anchoring at the soft soil texture position is guaranteed; the power structure adopts a multipurpose connector to meet