Shaft chair

A shaft chair is a construction that serves to replace the shaft extension in the area of the individual stops of the shaft in a special way. In addition, the shaft frame should support the base of the shaft lining in the area of the respective filling points. The respective stop is also formed by the shaft chair.

Basics

At the transition from the shaft tube to the route , the area around the shaft tube must be made larger than the actual shaft diameter. This transition area from the shaft tube to the route is called the shaft bell. The shaft bell must be created with a special extension. The shaft extension cannot be used in the area of the filling locations, since otherwise it would not be possible to load the conveying vessels. A suitable fastening option must also be available for the shaft guide .

Assembly and installation

The shaft chair must be stable and have a sufficiently large diameter so that the conveying vessels have enough space and all shaft fittings can be installed. The shaft chair has no load-bearing connection with the shaft extension. This means that upsets that affect the shaft lining are largely kept away from the shaft chair. If the shaft frame is damaged due to subsidence of the shaft lining, this leads, depending on the severity of the damage, to restrictions in the production operation or to a complete interruption of the shaft production . The shaft chairs are made either from wooden beams or from steel segments. Shaft chairs made of wood are preferably used in blind shafts with a rectangular shaft disc . The shaft extension is supported with a wooden structure. The wooden shaft chair is made of two squares, which are connected to each other by mortised bolts in the corners. This construction is placed on a foundation made of masonry. Shaft chairs made of wood are stabilized with struts that are attached to the extension of the shaft bell. In day shafts, steel shaft chairs are preferred. These are placed on foundations made of steel girders.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f Carl Hellmut Fritzsche: Textbook of mining science. Second volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962
↑ Fritz Heise, Fritz Herbst: Textbook of mining science with special consideration of hard coal mining. First volume, published by Julius Springer, Berlin 1908
^ ^A ^b Fritz Heise, Fritz Herbst: Textbook of mining science with special consideration of hard coal mining. First volume, fifth improved edition, published by Julius Springer, Berlin 1923
↑ ^a ^b ^c Franz Rziha: Textbook of the entire art of tunneling. First volume, published by Ernst & Korn, Berlin 1867
^ 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 Patent specification of Preussag Anthrazit GmbH: No DE3942828C1 07/11/1991, tension-free guide rail displacement in settling shafts of underground operations online (accessed on September 2, 2011)

Remarks

↑ A stop is the transition area between a floor and the respective shaft. (Source: Walter Bischoff, Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: Das kleine Bergbaulexikon .)

[Quelle_1-1] ↑ ^a ^b ^c ^d ^e ^f Carl Hellmut Fritzsche: Textbook of mining science. Second volume, 10th edition, Springer Verlag, Berlin / Göttingen / Heidelberg 1962

[Quelle_5-2] Fritz Heise, Fritz Herbst: Textbook of mining science with special consideration of hard coal mining. First volume, published by Julius Springer, Berlin 1908

[Quelle_6-4] A ^b Fritz Heise, Fritz Herbst: Textbook of mining science with special consideration of hard coal mining. First volume, fifth improved edition, published by Julius Springer, Berlin 1923

[Quelle_2-5] Franz Rziha: Textbook of the entire art of tunneling. First volume, published by Ernst & Korn, Berlin 1867

[Quelle_4-6] Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary. 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7

[Quelle_3-7] Patent specification of Preussag Anthrazit GmbH: No DE3942828C1 07/11/1991, tension-free guide rail displacement in settling shafts of underground operations online (accessed on September 2, 2011)

[Anm._KleiBebLex.-3] A stop is the transition area between a floor and the respective shaft. (Source: Walter Bischoff, Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: Das kleine Bergbaulexikon .)