Ring seal for apertures of multi-shelled structures, especially of underground operation
EP0752503A1
Sealing ring for gaps between multi-element constructions, in particular for underground works
DE19536146A1
Underground structures sealing to prevent water ingress, esp. into tunnels
DE19536145A1
Tunnel sealing against invasive moisture
EP0554692A1
Method for sand-blasting and device for carrying out the method
ATA121291A
Method and device for measuring route profiles of underground operation
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Mine-walling mat-production method - forms profiled portions without transverse bars by bending lengthwise ones
ATA76285A
Method for producing a tunnel tube or the like.
DE2934116A1
Electric circuit which expels water from clay - by using electro osmosis rods driven into clay at intervals, with cathodes connected to water-extraction pump
DE2928229A1
Tunnel or mine gallery tubbing ring blocks - have faces angled so that any one can be ridge closing block
DE2928228A1
Tunnel or gallery reinforced concrete tubbing ring - has several half sections arranged in homologous fashion with end faces permitting versatility
