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Bergteamet, Sweden
Bergteamet Raise Boring is a highly specialized raise boring contractor with operations around the world.The company was founded by the Swedish construction company Skanska in 1974. Its main business is to improve and enhance mechanized shaft construction, and, with its own techniques, replace other dangerous methods. |
In December 2005 the company was acquired by the Swedish tunnelling and shaft contractor Bergteamet AB. A combination which means that Bergteamet can now offer a complete underground solution as one contractor. The company operates independently and has customers all over the world. Bergteamet have completed contracts in 35 countries on six continents.
The company has grown and expanded internationally over this time and it has invested in 10 raise boring rigs of various size and has an experienced staff of 35 people. The company operates independently and has customers all over the world. They have completed contracts in 35 countries on six continents.
Normally the raise boring technique produces pilot holes with deviations between 0.5 - 1.0 % of pilot hole length. In most cases this is acceptable, but in some applications the need for a straight, controlled hole is critical. Bergteamet offers Rotary Vertical Drilling System (RVDS) which guarantees tolerances within 0.2% of pilot hole lengths.
The RVDS is a directional tool with which it is possible to guarantee straight holes for standard raise boring diameters (12 1/4", 13 3/4" or 15") without changing the normal raise boring drilling parameters.
The tool is an automatic steering-system for drilling vertical holes. Based on measured values of the two-axis inclination sensors the deviation from vertical course is determined. Exceeding permissible variation activates the hydraulic steering system. Extendible stabilizer ribs generate radial forces and work against the angle build-up. Simultaneously the inclination data are transmitted by mud pulsing (water) to the surface. |
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The RVDS is supplied to the rig as a complete system consisting of the downhole tool and an independent PC-based surface system. The downhole tool can be divided into three parts, each approximately 1.5 m long. It is connectable with standard DI22 8 1/4" threads with normal wrench flats to fit all types of raise bore machines. In order to monitor the self-steering drilling process, data signals are transmitted to the surface via positive mud pulses and are received decoded and visualized by a surface unit. |
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