Wooden box (mining)

Wooden box made of oak

In mining, a wooden box is a support element made up of squared timber or sleepers that has the shape of a hollow box. Larger areas can be supported with wooden boxes than with other types of construction . However, wooden boxes only have about a fifth of the load-bearing capacity of recovery boxes filled with sandstone chunks or of recovery walls . Wooden boxes have a high weather resistance . In addition, a lot of wood is required for their creation.

construction

A wooden box is made from several pieces of wood. To do this, the pieces of wood are placed crosswise on top of each other. Two pieces of wood are used per layer. The timbers of the lowest layer must always be in the direction of fall. The contact points of the individual pieces of wood must be exactly one above the other. Wooden boxes can be more or less flexible depending on the wood used. The greatest resilience is found in wooden boxes made from old reclaimed pine logs. With fresh pine wood, the flexibility is slightly less. In order for the wooden boxes to be sufficiently flexible, sufficient distance between the woods is required in addition to the selection. If a higher load-bearing capacity is to be achieved, the miner puts more pieces of wood into the box in every layer when building the wooden box. A third timber per layer increases the load-bearing capacity considerably. If so many pieces of wood are installed per layer that the box is tight, this structure is called wooden piers.

use

Wooden boxes are used in mining routes when stored flat . They are either on one or on both sides between Hangendem and lying installed and then form part of the roadway support . When Strebbruchbau wooden boxes are used as so-called traveling boxes and used to secure the Streckensaumes . Wooden boxes are installed in blind shafts to secure the shaft chair and in rock sections to secure the extension against degradation-related effects . Due to their construction, wooden boxes can also be used to support cavities that are too high for support by means of a punch .

Individual evidence

^ ^A ^b ^c Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
↑ ^a ^b ^c Albert Serlo: Guide to mining science. First volume, fourth revised and up to the most recent edition supplemented, published by Julius Springer, Berlin 1884.
↑ J. Weißner: Findings from the observation of mountain movements for mining. In: Glückauf, Berg- und Hüttenmännische magazine. Association for mining interests in the Oberbergamtsiertel Dortmund (Ed.), No. 41, 72nd year, October 10, 1936, pp. 1030-1032.
↑ ^a ^b Horst Roschlau, Wolfram Heinze, SDAG Wismut (Hrsg.): Knowledge storage mining technology. 1st edition. German publishing house for basic industry, Leipzig 1974, p. 85.
^ ^A ^b Carl Hellmut Fritzsche: Textbook of mining science. Second volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962.

[Quelle_0-1] A ^b ^c Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .

[Quelle_1-2] Albert Serlo: Guide to mining science. First volume, fourth revised and up to the most recent edition supplemented, published by Julius Springer, Berlin 1884.

[Quelle_4-3] J. Weißner: Findings from the observation of mountain movements for mining. In: Glückauf, Berg- und Hüttenmännische magazine. Association for mining interests in the Oberbergamtsiertel Dortmund (Ed.), No. 41, 72nd year, October 10, 1936, pp. 1030-1032.

[Quelle_3-4] Horst Roschlau, Wolfram Heinze, SDAG Wismut (Hrsg.): Knowledge storage mining technology. 1st edition. German publishing house for basic industry, Leipzig 1974, p. 85.

[Quelle_2-5] A ^b Carl Hellmut Fritzsche: Textbook of mining science. Second volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962.