Concrete-filled flexible mold forming strut allowing small hole to be formed in underground chamber

The utility model provides a concrete-filled flexible mold forming strut allowing a small hole to be formed in an underground chamber, and belongs to building construction. The concrete-filled flexible mold forming strut comprises an upper soil layer, the chamber, a lower soil layer, the concrete filling hole, a flexible mold plate, sealing hoops, reinforcing hoops, fixing buckles and a strut cavity. The concrete-filled flexible mold forming strut is characterized in that the concrete filling hole communicated with the ground surface and the chamber is drilled in the upper soil layer of the chamber of the strut needing to be installed, the cylindrical strut cavity formed by the flexible mold plate made of fabric or leather is located with the concrete hole as the center, the strut cavity is fixed through the sealing hoops, the reinforcing hoops and supporting rods to be formed, and then the strut cavity is filled with concrete through the concrete filling hole to form the strut. Compared with the prior art, t