Archivi tag: pipe jacking

HYBRID PIPE JACKING/DTH CONCENTRIC AIR POWERED HAMMER TECHNIQUE

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Client: AC Srl Unipersonale – SIEMENS Spa – Italy

Year: 2011

What I did: I made the detailed design and work supervision of the installation, by hybrid  pipe jacking/down-the-hole concentric air hammer technique, of three DN300 (12”) steel casings and the installation, by slip-lining, inside the 12″ steel casings, of three HDPE DN280 (11″) pipes, for the crossing of a rocky hill – Length of each crossing: 106,0 meters. The HDPE DN280 pipes, installed inside the 12″ steel casings, were used by SIEMENS to lay hi-tension electrical cables. A MITSUBISHI ULTRA MAXBIT 12″ were used to perform the boreholes.

HYBRID PIPE JACKING/DTH CONCENTRIC AIR POWERED HAMMER TECHNIQUE
Longitudinal section of the crossing - the limestone was deeply fractured (RQD = 20%)
Topographic survey of the rocky hill to cross.
The down the hole air powered concentric hammer - provided by MITSUBISHI
Scheme of the the down-the-hole concentric air powered drilling head, provided by MITSUBISHI.
Customized pulling head, to pullback HDPE DN280 pipes inside the 12
Detail of the pulling head before the assembling.
The crown (DN300 - 12

 

 

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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