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Company cases about Performing rock drilling and excavation work in the tunnel

Performing rock drilling and excavation work in the tunnel

2025-12-29

At the 1200-meter tunnel working face, a hydraulic drilling rig was used to drill blast holes with a diameter of 45 mm and a depth of 5 m. The working stratum was medium-hard granite (compressive strength 120 MPa), and the environment was humid and dusty.

Previously, when using ordinary alloy drill bits, two major problems existed:

Poor wear resistance of the drill bit: A single drill bit could only complete 20 holes (approximately 100 meters of drilling), requiring frequent shutdowns for replacement;
Unstable energy transfer: The large gap between the drill bit and the drill rod resulted in strong drilling vibrations, leading to irregular borehole walls and affecting the blasting effect.

Application results

When used with the same series of drill rods, the HENGLONG R32 drill bit achieves a dual improvement of "high durability + stable energy transmission";
Featuring reinforced carbide inserts and an impact-resistant base, a single drill bit can complete 45 holes (approximately 225 meters of drilling), increasing service life by 125% and reducing drill bit replacement frequency by 80%;
Drilling is more efficient: the precise fit between the drill bit and the drill rod reduces energy loss by 15%, increasing drilling speed from 0.8 m/min to 1.1 m/min, and reducing single-cycle operation time by 2 hours;
The boreholes are more regular: the optimized arrangement of the drill bit's cutting teeth improves the smoothness of the blast hole walls by 30%, increasing the uniformity of subsequent blasting fragments by 25%, and reducing secondary crushing costs.

During three consecutive months of operation at the mine, the overall cost of using HENGLONG R32 drill bits was 40% lower than that of ordinary drill bits, while simultaneously supporting a breakthrough in productivity, increasing the daily drilling volume at the work face from 80 meters to 150 meters.

1277482737

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