Line hem
As Streckensaum is known in the mining underground the lateral boundary of a degradation route . The lateral boundary is towards the seam and the old man . Due to the rock pressure , the line edge in mining roads is often a zone of weakness that must be supported by means of suitable measures such as the edge offset. These measures, known as hem protection, are used to protect the route hem against the old man.
Misalignment
As Saumversatz be in mining routes as measures wooden boxes , mountains boxes or mortar boxes behind the longwall used. With the wooden box, pit timber, either squared lumber or railway sleepers, is crossed to form a hollow box. The wooden box is installed between the hanging wall and the lying wall. If several sleepers are placed next to each other so that the wooden box is not hollow but tight, the miner calls it a wooden pillar. In the case of a recovery box, a construction made of squared timber or railway sleepers in the form of a square is assembled into a box that extends from the horizontal to the hanging wall. The space in between is filled with rock. In a mortar box, a box made of squared timber is sealed from the inside with cloth and filled with mortar, anhydrite or lightning dams. Another way of securing the seams are so-called track dams . One measure to prevent water from escaping into the track, with so-called long front impregnation, is the stabilization of the track hem using magnesia binders.
Individual evidence
- ^ A b c d Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining encyclopedia. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
- ↑ a b c Ernst-Ulrich Reuther: Textbook of mining science. First volume, 12th edition, VGE Verlag GmbH, Essen 2010, ISBN 978-3-86797-076-1 , pp. 569-571.