Mine water sewer Ibbenbüren - Construction work for mining facilities

Construction of a mine water sewer to collect the rising mine water at the level of +63 m above sea level after the end of coal/anthracite extraction in the Ibbenbüren mine and to feed it to a water treatment plant at a gravity gradient.

The mine is drained via the mine water sewer through the segmental lining into a prefabricated invert channel, which drains the mine water westwards out of the mine into the Gravenhorst wastewater treatment plant. In areas where mine water drainage is required, the two drives are backfilled with pearl gravel as an annular gap backfill and in areas where no mine water drainage is required, with a two-component mortar.

Cut-and-cover method west:
230 m long section in cut-and-cover method with bored pile shoring and 30 m long starting pit for the TBM, which is used for the west drive up to the central shaft.

Central shaft:
depth 75 m, inner diameter 30 m. The central shaft will be used as the target shaft for the TBM West and as the starting shaft for the TBM, which will carry out the East drive. After completion of the tunnel work, an elevator/staircase shaft will be constructed and the remaining shaft area will then be backfilled.

Shaft 1 Oeynhausen:
After the TBM arrives in a target cavern, this existing 100 m deep shaft will be upgraded.

Project data:

• Total length: 7,400 m.
• 2 TBM drives: West 3,230 m and East 3,870 m.
• With 2 variable-density TBMs (VD-TBM).
• Drilling diameter: 4.80 m
• Inner diameter: 3.60 m
• Outer diameter: 4.50 m
• Segment lining, d = 0.45 m.