INSTALLATION IN VERY HARD AND ABRASIVE ROCK OF A DN700 CAST IRON WATER PRESSURE PIPE

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Client: KLAPFER BAU Srl – SANTATO MARCO TRIVELLAZIONI – Italy

Year: 2011

What I did: I made the detailed design and supervision of the installation by microtunneling and HDD, in very hard and abrasive quartzite-diorite rock, of a DN700 mm (28″) cast iron water pressure pipe – the work was split in two section, each one 80 m (265 ft) long. The borehole diameter was 800 mm (32″). A very challenging job for the extreme hardness and abrasivity of the rock. The water pressure pipe is part of a mini hydro-power plant in the Alps (Italy).

INSTALLATION IN VERY HARD AND ABRASIVE ROCK OF A DN700 CAST IRON WATER PRESSURE PIPE
The rig while drilling the pilot bore.
Down-the-hole air hammer ready to drill the pilot bore.
The double stage DN800 -600 back-reamer used for the final reaming
The borehole after intermediate reaming.
The borehole after the final reaming.
The auger boring machine (ABM).
A 32
The borehole after retracting the SBU, at 40 m of bore length.
Close-up of the two-rows TCI disk cutter used to complete the bore.
The borehole after retracting the SBU, at 62 m of bore length.
The borehole after retracting the SBU, at 62 m of bore length.

 

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