Abstract: Provided are a T-shaped reamed pile, a composite foundation, and a construction method for the composite foundation, relating to the technical field of civil engineering. The composite foundation is composed of a T-shaped reamed pile, soil between piles, and a cushion layer. The T-shaped reamed pile is composed of a core pile, a reamed body surrounding the outside of the core pile. A depth of the core pile is not lower than that of the reamed body, the reamed body includes an upper reamed body, and a lower reamed body, and a diameter of the upper reamed body is larger than that of the lower reamed body. The core pile is a precast pile, the reamed body is a cast-in-place reamed body, and the cushion layer is a sand-gravel cushion layer, or a reinforced cement-soil cushion layer.

Abstract: A spiral impact drilling machine applicable to rock and soil and a construction method are provided. The drilling machine includes a rock chiseling part, a soil drilling part, a gear, a drill rod, and a drill bit. The rock chiseling part includes an air cylinder. A piston is arranged in the air cylinder. The top of the piston is fixedly connected with to a turbine fan blade. The bottom of the piston is fixedly connected to a force transferring component. The soil drilling part includes a motor. The motor is arranged in the force transferring component. The inner part of the gear is in nested connection with the drill rod. The outer part of the gear is in engaged connection with each of the bottom of the force transferring component and the motor. The bottom of the gear is fixedly connected to the drill rod through a stress component.

Abstract: A spiral impact drilling machine applicable to rock and soil and a construction method are provided. The drilling machine includes a rock chiseling part, a soil drilling part, a gear, a drill rod, and a drill bit. The rock chiseling part includes an air cylinder. A piston is arranged in the air cylinder. The top of the piston is fixedly connected with to a turbine fan blade. The bottom of the piston is fixedly connected to a force transferring component. The soil drilling part includes a motor. The motor is arranged in the force transferring component. The inner part of the gear is in nested connection with the drill rod. The outer part of the gear is in engaged connection with each of the bottom of the force transferring component and the motor. The bottom of the gear is fixedly connected to the drill rod through a stress component.