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Drilling of grout holes in an inspection tunnel under the Ohra dam in Oberhof, Germany . The inspection tunnel which extends under the dam has a length of 100 meter and an inclination of 25 degrees. The purpose of the grout holes which has a length varying from 50-90 meter was to create a grout curtain against the dam. Stump Spezialtiefbau GmbH was the drilling contractor.

Result:
The benefit with using Wassara in this project was the improved working conditions in the tunnel with reduced dust and no oil mist in the air.

Equipment: Hammer Wassara W80
  Bit Wassara 95 mm
  Pump Woma
  Drilling fluid Clean water
  Drill pipe OD 76 mm, length 1500 mm
 

Rig

Diamec 262
  Formation Soft granite