Modernisation of the railway line Wroclaw – Poznan

Modernisierung der Bahnlinie, modernisation of railway © TERRA AG, Reiden, Switzerland
The modernisation of the E-59 railway line between Wroclaw and Poznan required a lot of new cable laying parallel to the railway line. This included 6 HDD river crossings under the rivers Widawa and Odra. The contractor M/s SABEL of Wroclaw decided to use TERRA-JET equipment. The main HDD works were executed by their TERRA-JET TJ 8522 S with a pulling force of 22 tonnes, a torque of 8’500 Nm and a drilling fluid volume of 400 ltr/min (48’400 lbs, 6’300 ft.lbs, 100 gpm). The River Widawa was crossed twice in lengths of 300 m and 336 m (1’000 ft and 1’100 ft). The pilot bore Ø 140 mm (5.5”) was reamed step by step to 240, 360 and 460 mm (18”). A pipe bundle of 4 HDPE pipes with OD 125 mm (5”) were pulled in. As drilling fluid TEQGEL Bentonite was used. These river crossings required 70% of the maximum parameters of the drilling machine. The river Odra was crossed 4 times in lengths between 165 m - 312 m (550 ft – 1’030 ft). Pipe bundles of two HDPE pipes OD 160 mm (6.3”) were pulled in. Locating of the drill head was done with the Digitrak F5 on a boat. After 312 m (1’030 ft) the drill head reaches the other end of the river. An intermediate reaming is started. Drill rods are connected behind the reamer. The TERRA-JET TJ 8522 S during backreaming. The drill mud flows into a large pit besides the entry pit.
Blick auf die Bohrtrasse, view onto the drill path © TERRA AG, Reiden, Switzerland
Blick auf den Startpunkt, view to the starting point © TERRA AG, Reiden, Switzerland
Ortung auf einem Boot, locating on a boat © TERRA AG, Reiden, Switzerland

Bohrkopf erreicht das Ziel, drill head reaches the target © TERRA AG, Reiden, Switzerland
Zwischenaufweitung mit Räumer, intermediate reaming © TERRA AG, Reiden, Switzerland
TJ 8522 S während der Aufweitung, TJ 8522 S during backreaming © TERRA AG, Reiden, Switzerland


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