Teamwork ensures swift pipe jacking under the Elbe
Jan 21, 2015
Breakthrough by a micro-tunnelling machine from Herrenknecht in a pipe-jacking project near Hamburg has closed a decisive gap in the construction of two new gas pipelines. The 1.5 kilometer route runs up to 35 meters under the Elbe through various, partially complex geological zones. This demanding technical challenge was competently mastered by the long-term Herrenknecht contractor A.Hak Drillcon on December 4, 2014 after a total of 112 days of tunnelling and in time for the feast day of Saint Barbara, the patron saint of tunnel builders and miners.
Further collaboration on the jobsite proceeded particularly positively. Two Herrenknecht machine operators supported A.Hak Drillcon during the tunnelling process enabling efficient three-shift operations around the clock. At all times, experienced service technicians from Herrenknecht were also on hand to provide tunnelling support – on site so as not to waste any time. "On such a challenging project, continuous mutual exchanges of experience are simply advantageous. We appreciate that. Comprehensive service is as important as good technology." summarized Peter Dennig, the responsible manager at A.Hak Drillcon.
The machine encountered large boulders almost 200 meters into the route. But such geological conditions had in fact been anticipated and the jobsite team swiftly overcame these obstacles thanks to their experience and thorough preparations. Following the exchange of worn excavation tools, the AVND2400 picked up speed along the remaining route resulting in top values of up to 40 meters per day. Thereby, the entire tunnelling length could be handled directly by the main jacking station in the starting shaft without using any intermediate jacking stations. This top performance was attributable to the consistent application of AVND technology, automatic annular gap lubrication and the great teamwork displayed by everyone involved in the project.
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