What Is The Working Principle of A Second-hand Rotary Drilling Rig? The Entire Process From Drilling To Pile Formation

Although second-hand rotary drilling RIGS are second-hand equipment, their working principle is the same as that of new machines. Relying on the coordination of mechanical transmission and hydraulic power, they efficiently complete the foundation construction process from drilling to pile formation. The following is an analysis of its core operation links:

1. Power drive and equipment positioning: The engine provides power, which is converted into the rotation and pressurization power of the drill pipe through the hydraulic system; Before the operation, level the machine body through the outriggers to ensure the verticality of the borehole.

2. Bucket cutting drilling: The cutting teeth at the bottom of the bucket cut into the soil layer or rock layer, and when rotating, they draw the rock and soil into the bucket. As the drilling deepens, the drill pipe extends section by section, maintaining continuous cutting.

3. Lifting and unloading of construction waste: After the drill bucket is full, the drill pipe rotates in the opposite direction to close the bucket door, and the drill bucket is lifted to the ground by the winch. Reverse the drill bucket towards the construction waste area and automatically discharge the rock and soil.

4. Hole wall maintenance treatment: When encountering loose strata, mud should be injected into the hole for wall protection to prevent hole collapse. Some projects adopt casing follow-up, and the casing is pressed into the stratum through hydraulic power to reinforce the hole wall.

5. Hole cleaning and steel cage lowering: After drilling to the designed depth, use a hole cleaning drill bucket or high-pressure water gun to remove the sediment at the bottom of the hole. The prefabricated steel cage is vertically placed into the hole through hoisting equipment and positioned and fixed.

6. Concrete pouring for pile formation: The guide pipe descends from the center of the steel cage to the bottom of the hole. Concrete is continuously injected through a concrete pump, and the guide pipe is gradually lifted until the hole is filled with concrete to form a pile.

In summary, the second-hand rotary drilling rig achieves efficient pile formation through continuous operations such as power transmission, cyclic drilling, hole wall maintenance, steel cage placement and concrete pouring. The core lies in the precise coordination between the mechanical and hydraulic systems. Even if the equipment has been used many times, as long as it is properly maintained, it can still meet the technical requirements of foundation construction.