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Case study published: Water-powered drilling for securing an immersed train tunnel in Stockholm

The City Line railway project builds a six km long commuter train tunnel under the central parts of Stockholm, Sweden. The tunnel will be built in bedrock. At one part it will be immersed.

The City Line railway project builds a six km long commuter train tunnel under the central parts of Stockholm, Sweden. The tunnel will be built in bedrock. At one part it will be immersed.
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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The case study as PDF