Technical data
Project description
Construction of a mine water channel.
- Total length: approx. 7,400 m
- 2 drives: west 3,230 m and east 3,870 m long
- Inner diameter: 3.60 m
- Outer diameter: 4.50 m
- Bore diameter: approx. 4.80 m
Construction method
- Parallel tunnelling from 2 points of attack with 2 variable
- Density-TBMs (VDS), diameter: 4.80 m
- Single-shell tunnel lining with reinforced concrete segments
- Construction of the west starting excavation pit with overlapping bored piles and the centre shaft with anchors and shotcrete support
- 230 m long section using the cut-and-cover method with bored pile shoring and 30 m long starting excavation pit for the TBM, which is used for the west drive up to the centre shaft
- Centre shaft, depth approx. 75 mInternal diameter approx. 32 m
Geology
- Sand, gravel, sandstone/siltstone/claystone, coal seams, tunnels
General data
Project
Mine water channel Ibbenbüren, Germany
Client
RAG Aktiengesellschaft, Ibbenbüren, Germany
Contractor
Wayss & Freytag Ingenieurbau AG in a joint venture
Discharge of mine water
The centre shaft will be used as the target shaft for the TBM West and as the starting shaft for the TBM, which will excavate the east drive to the existing "Shaft 1 Oeynhausen".
Once the TBM arrives, this 100 metre deep shaft will be upgraded. The mine will be drained via the mine water channel through the segmental lining into a prefabricated invert channel, which will channel the mine water westwards out of the mine and into the Gravenhorst sewage treatment plant. In areas where mine water drainage is required, the two drives are backfilled with pearl gravel as annular gap backfilling and in areas where no mine water drainage is required, with a two-component mortar.
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