Anchoring of immersed tunnels involves drilling long holes with strict accuracy requirements. The water-powered DTH hammer from LKAB Wassara has a proven track record of its ability to drill long straight holes.
A LKAB Wassara water-powered DTH hammer will maintain a high rate of penetration in most kind of formations. The Wassara-hammer’s performance is unaffected by water in the formation, even at high back pressure.
Water-powered DTH drilling gives an optimal borehole surface for the anchoring process. The borehole surface needs to be clean and have enough roughness to ensure successful grouting of the anchor.
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