Milestone in guided auger boring
Nov 26, 2009
A novel steering technology from Bohrtec, extending the range of applications for guided auger boring techniques, has been used for the first time on two pipe eating projects in Germany.
It should also be noted that this significant extension of application possibilities does not affect the economic advantages of the guided auger boring using pilot rods because the guided auger boring system with the Front Steer retains the advantages of quick and easy set-up of the equipment onsite and simple operation.
After reaching the target shaft, the steering head was uncoupled and the team started to push in the DN 300 clay jacking pipes. It took only four days to complete the 60 metre drilling length to the satisfaction of all parties and the pipe eating premiere with the new Front Steer proved to be a complete success.
After approval from Berliner Wasserbetriebe the preliminary works were completed and the Bohrtec Front Steer was used a second time for the online replacement of an existing sewer. Despite a smooth beginning to the drilling works, after five metres there was a dramatic increase of the pushing force and the cutting wheel torque. It was presumed that the machine had struck a sheet pile because according to the construction plan there had been some sheet piles at this position of the old line which should have been cut down to a depth of about three metres, but this was obviously not the case.
Despite the risk of drilling head damage, it was decided to continue tunnelling because the cost of disturbing the rails and the consequential cost for the rail replacement bus service would have been considerably higher. The sheet pile remains were passed despite much wear and tear of the cutting tools and the full length of 28 metres was completed successfully.
The Front Steer proved to be a fortunate choice, especially with regards to the sheet pile. If a conventional ground displacing drilling system had been used – as originally planned – the drilling would have been stopped when the sheet pile was encountered, thus disturbing the rails and requiring a special bus service.
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Contact
Bohrtec Gesellschaft für Bohrtechnologie mbH
52477 Alsdorf
Phone:
+49 (0) 2404 9881 - 0
Fax:
+49 (0) 2404 9881 - 10