Anchor rod multi-section reaming machine tool and application thereof

An anchor rod reaming method applied by an anchor rod multi-section reaming machine tool used cooperatively with an anchor rod drill rig, wherein the machine tool comprises a hydraulic station, a first pipe, a second pipe and a reaming machine head, wherein the reaming machine head comprises a hydraulic cylinder, an arch pressing device fixing disc, an arch pressing device, a base plate and a supporting structure;

• the hydraulic cylinder is fixed at a lower end of a drill rod of the anchor rod drill rig;
• the hydraulic cylinder comprises a cylinder body, a piston and a piston rod, the piston is arranged inside the cylinder body and axially moves relative to the cylinder body such that the cylinder body is divided into a hydraulic cylinder upper chamber and a hydraulic cylinder lower chamber which have variable volume, the hydraulic cylinder upper chamber is connected with the hydraulic station through the first pipe, the hydraulic cylinder lower chamber is connected with the hydraulic station through the second pipe, an upper end of the piston rod is fixed at a lower portion of the piston, and a lower end of the piston rod is fixed at an upper portion of the arch pressing device fixing disc;
• the arch pressing device comprises a pair of upper arch arms and a pair of lower arch arms radially arranged symmetrically to the pair of upper arch arms, upper ends of the pair of upper arch arms are rotatably connected with a central position of a lower portion of the arch pressing device fixing disc, lower ends of the pair of upper arch arms are rotatably connected with upper ends of the pair of lower arch arms, and lower ends of the pair of lower arch arms are rotatably connected with a central position of an upper portion of the base plate;
• and
• the supporting structure is fixed between a lower portion of the cylinder body of the hydraulic cylinder and the base plate;
• wherein the anchor rod reaming method comprises:
• step a:
• drilling in the stratum to a predetermined depth by the anchor rod drill rig to obtain a pile hole;
• step b:
• disposing the reaming machine head of the machine tool at a first position in the pile hole and disposing the hydraulic station of the machine tool outside the pile hole:
• step c:
• supplying pressure to a hydraulic cylinder of the reaming machine head by the hydraulic station such that the piston is pushed to axially move, and then the piston pushes the arch pressing device fixing disc to axially move via the piston rod and allows the arch pressing device to radially expand to squeeze a hole wall at the first position in the pile hole, thereby realizing single squeezing and expansion;
• and
• step d:
• at the first position, rotating the reaming machine head at a preset angle for many times, and after rotating the reaming machine head each time, repeating the step c to realize multiple squeezing and expansion until a complete disc cavity is formed at the first position, thereby realizing anchor rod reaming at the first position.