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Capable technology for drilling in Southern Link rock tunnels

Download the Case Study as PDF-file:

Pre-drilling for jet grouting Södra länken, Sweden

Project Description:

A grout curtain consisting of 128 jet piles was constructed toprevent infiltration water from leaking into the Södra Länken's (Southern Link's) rock tunnels at Nobelsvackan.

Because the formation consisted of water-bearing moraine soil, and given the strict requirements in terms of minimizing the impact on the surroundings, Wassara was chosen as the most suitable technology for pre-drilling the holes for the jet piles. Drilling capacity was also taken into consideration.

The actual jet grouting was performed using a so-called "singlesystem." The project met the strict requirements set in terms of both minimizing the impact on the surroundings during the actual work and those pertaining to the impermeability of the grout curtain.

The project was commissioned by the Swedish Road Administration/Stockholm Region. Planning, management and quality control were performed by Golder Associates AB. The contractor for the jet grouting work was the German firm Züblin Spezialtiefbau GmbH.

 

Result:

The project was completed according to given frames with respect to minimal impact on surrounding formation as well as the impermeability of the grout curtain.


*Published with permission of Golder Associates AB

Equipment used

DTH hammer Wassara W100
Drill bit Wassara 115 mm
Pump Metax MP 7 (for both pre-drilling and jet grouting) 
Drilling fluid Clean water from fire post 
Rig Hütte HBR 201 
Drill rods 89 mm jet injection pipe 
Scope of drilling 128 jet columns 
Drilling formation Moraine with high water flow