Natural rock varies too much for a fair hammer comparison. TOPDRILL cast 145 MPa UHPC cylinders, buried them, and drilled them with the same rig and compressor — only the hammer changed.
We Built the Hard Rock Ourselves Read More »
Ø1,000 mm large diameter DTH bit face, dust-covered after drilling hard abrasive gabbro
Hard Rock Lets You Plant Shallower — If You Can Drill It Read More »
![[Photo ③] Site overview. Barge, crawler crane and tug working against the rock shoreline, with land-section piles already standing.](https://topdrill.org/wp-content/uploads/2026/08/20240201_112442-1024x768.jpg)
A 15 mm clearance is routine on solid ground. Holding it from a barge in a tidal channel is not. Field notes from 20 offshore piles in Korea.
