Views: 0 Author: Site Editor Publish Time: 2026-10-08 Origin: Site
Before the formal drilling operation of the rotary drilling rig, standardized pre-treatment work needs to be completed, which is the core link to ensure the accuracy of pile foundation drilling and avoid hole deviation and collapse problems. The construction team first completes the pile positioning and point verification based on the construction drawings, accurately marks the center position of the borehole, and then buries steel casing to stabilize the soil layer at the hole opening, isolating loose soil and surface water interference. At the same time, the drilling rig independently adjusts the levelness of the body and the verticality of the mast, calibrates the vertical accuracy of the drill pipe based on the intelligent control system, and adjusts the mud ratio to ensure the stability of the hole wall. The entire preprocessing process is standardized and controllable, laying a solid foundation for subsequent continuous drilling and uniform hole formation, and adapting to various infrastructure pile foundation construction scenarios such as highways, bridges, and buildings.
Drilling operation is the core process of rotary drilling rig drilling, which relies on the principle of combining mechanical power and gravity pressure to complete rock and soil cutting and soil extraction operations. The power head of the equipment outputs torque, driving the drill rod and the bottom cylindrical drill bucket to rotate at a constant speed. At the same time, the self weight of the drilling tool and the hydraulic pressure system are used to apply bi-directional force, allowing the drill bucket teeth to continuously cut and break the underground soil and rock layers. The cut rock and soil will be automatically stored inside the sealed drilling bucket. After reaching the rated depth in a single feed, the rotation and pressure will be stopped. Compared to traditional pile driving equipment, rotary drilling rigs can flexibly adjust torque and pressure according to the softness and hardness of the soil. Soft soil layers rely on their own weight for drilling, while hard rock layers are pressurized and broken through with hydraulic assistance, adapting to various complex geological conditions and greatly improving drilling efficiency and adaptability.
After a single drilling and soil extraction is completed, the equipment starts the bucket lifting process, uniformly lifting the drill rod and bucket to the ground position. The lifting speed is strictly controlled throughout the process to avoid negative pressure erosion of the hole wall caused by rapid lifting, and to prevent construction hazards such as necking and hole collapse. After the drilling bucket is drilled, it is aligned with the abandoned soil area through the rotation and displacement of the machine body, and the automatic slag unloading operation is completed by opening and closing the drilling bucket valve and reversing the pressure relief. After unloading the soil, the drilling rig is reset and aligned, and the drilling bucket is lowered again into the hole to carry out the next round of drilling and soil extraction operations. Through the closed-loop operation of "drilling for soil - lifting the bucket out of the hole - unloading and resetting the soil", the drilling depth is gradually deepened until it reaches the standard hole depth of the construction design, and the entire operation is coherent and stable.
After the drilling depth meets the standard, it marks the end of the drilling process and immediately enters the final hole cleaning and acceptance stage, which is a key step to ensure the quality of pile foundation construction. Replace the equipment with a dedicated hole cleaning drill bucket, thoroughly clean the residual sediment, floating soil, and gravel at the bottom of the hole, effectively control the thickness of sediment at the bottom of the hole, and ensure that the subsequent pile foundation bearing capacity meets engineering standards. After the hole cleaning is completed, the construction personnel conduct a comprehensive verification of core parameters such as hole depth, hole diameter, verticality, and hole wall integrity, and compare them with the construction design standards to complete the acceptance. The complete closed-loop process, controllable precision, high regularity and stable quality of formed pile holes, meet the high standard construction requirements of various large-scale infrastructure projects, and are also the core advantages of rotary drilling rigs widely used in pile foundation engineering.
