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Securing immersed tunnels with Wassara

Hole straightness

Anchoring of immersed tunnels involves drilling long holes with strict accuracy requirements. The water-powered DTH hammer from Wassara has a proven track record of its ability to drill long straight holes.


High drilling performance

A Wassara water-powered DTH hammer will maintain a high rate of penetration in most kind of formations. The Wassara hammer performance is unaffected by water in the formation, even at high back pressure.


High quality borehole surface

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.


Example of successful project:

Long concrete tunnel with people in white helmets, walking where tracks to commuter trains will be laid further into the project.

Anchor drilling when building the Söderströmstunneln under water

The City Line railway project builds a six km long commuter train tunnel under the central parts of Stockholm, Sweden. The water-powered drilling technology was chosen as it is the faster alternative and gives a borehole surface that is optimal for the following grout process. It is also able to meet all environmental and accuracy demands.

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