HDL-260 Anchoring Application Cases

2026-03-04 10:10:02 超级管理员 Engineering Case 106 views

Model: HDL-260C Top Drive Multi-functional Drilling Machine

Drill Bit Configuration: 146 sets of drill bits (4 meters per rod)

Engineering Type: Anchor-based

Geological Conditions: 0-25 meters sand and clay, 25-30 meters sand-gravel mixture.

Construction Angle (°): 35

Pole Diameter (mm): 150

Depth of Hole (m): 30 meters

Total Drilling Efficiency: 35 minutes

Equipment Average Hourly Fuel Consumption: 12L/H

HDL-260C top drive anchor drill working at foundation pit site

HDL-260C anchor drill operating at foundation reinforcement site

HDL-260C multi-functional drilling machine at construction site

Engineering Steps and Parameters:

1. Positioning the drill machine to the designated hole, securing the drill base and legs;

2. Adjusting the hole angle;

3. Pumping (recirculating water), pressure 0.8MPA, flow rate 45m³/H;

4. Continuous drilling at a uniform rotational speed, maintaining a steady flow of mud and debris from the borehole. In the event of disruptions such as loss of circulation or reduced fluid flow, it may be necessary to backcirculate (washout) to dispose of cuttings;

5. Stopping the pumping system when the drill bit reaches 0.3 meters above the upper anchor holding device;

6. Installing the drill rod: using the downhole assembly to mechanically install the drill rod; after installation, reset the upper and lower arms of the downhole assembly;

7. Completing the installation of the drill pipe and continuing drilling until reaching the required design depth;

8. First installing an anchor (pre-assembled) inside the casing, then performing a first-time pumping operation, requiring the pump to fill the casing with mud, transitioning from yellow-colored mud to grayish-black cement grout. Flow rate should be sufficient before stopping pumping;

9. Disassembling the drill pipe using a disassembly method (left-hand rotation, right-hand stop and lift); loosening the threads until they are free;

10. Actuating the upper and lower arms of the downhole assembly to retrieve the drill pipe and place it in storage;

11. Repeating the disassembly procedure until the drill pipe is removed at -4 meters, where it will be left attached to the pole for the next borehole construction;

12. Once the drill pipe has been completely withdrawn from the hole, checking the length of anchor extension outside the casing to ensure a minimum 1-meter extension;

13. Immediately performing a second pumping operation (cement grout) at the freshly drilled hole, with pressure ranging from 0.3-0.5MPA;

14. Completing drilling operations.