Lerche shaft

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Lerche shaft
General information about the mine
Schacht Lerche.JPG

Lerche shaft
Information about the mining company
Funded raw materials
Degradation of Hard coal
Geographical location
Coordinates 51 ° 37 '41 "  N , 7 ° 42' 55"  E Coordinates: 51 ° 37 '41 "  N , 7 ° 42' 55"  E
Lerche shaft (regional association Ruhr)
Lerche shaft
Location Lerche shaft
Location lark
local community Hamm
Independent city ( NUTS3 ) Hamm
country State of North Rhine-Westphalia
Country Germany
District Ruhr area

The headframe of the Lerche shaft

Lerche shaft was a central mine shaft of the Ost mine in Hamm , which was closed on September 30, 2010 and where work is still being carried out. Today it is part of the Route of Industrial Culture .

history

Shaft Lerche was originally shaft 7 of the Königsborn colliery and thus at the same time the last shaft that was built in the name of and on behalf of the Königsborn mine. The beginning of the devastation was in 1971. In 1972 this shaft reached the Carboniferous at 452 m depth. It went into operation in 1973 and initially served to dispose of the used weather of the Monopoly III field. This should ensure the continued existence of the Koenigsborn colliery.

Shaft 7 was merged with the Heinrich Robert colliery (later Bergwerk Ost der Ruhrkohle AG ) in 1978 . Until 1998 he led the weather out of the mine.

With the amalgamation of the Heinrich Robert, Monopol and Haus Aden collieries to form the Ost mine , the shaft was given a new task. For € 280 million it was converted into a material, weather and cableway shaft. Until the east mine was closed, around 800 miners were transported underground in one large basket and one smaller basket every day. With a depth of 1,400 meters and a shaft diameter of around 8 meters, the Lerche shaft is one of the deepest shafts in the Ruhr mining industry.

Another superlative is its cooling system, once the main cooling system for the East Mine, which is still in operation today. The largest refrigeration system in Europe has an electrical cooling capacity of 20 megawatts . In mining as deep as that carried out by the Ost mine, the rock and coal layers have a temperature of around 65 ° C. The air heated in this way is cooled by means of three circuits: Above ground the refrigerant circuit, which continuously cools the refrigerant through condensers and evaporators. The resulting heat is dissipated via three cooling towers. In the second circuit, the cold water circuit, there is a 1,400 meter high water column with a diameter of 45 cm in the shaft itself. The water, cooled to 2 ° C by the first circuit, sinks through pressure pipes to the three-chamber pipe feeder , where it is removed from the hydrostatic 140 bar is reduced in pressure to 30 bar. Conversely, the three-chamber tube feeder builds up the required pressure in the heated water to send it up in the circuit. The third circuit follows at the bottom, the underground water circuit, which leads to the weather coolers (air-water heat exchanger ) and back. Even after the last shift, underground work still has to be carried out and the routes must therefore be cooled.

The headframe on the Lerche shaft comes from Werne , but not from the Werne colliery , which was closed in 1975 , but from the Romberg shaft (shaft VII) of the Haus Aden colliery in Werne-Langern, which was newly sunk in 1985 for the purpose of developing the northern field . After the Romberg shaft had been dropped and filled , the 136-tonne headframe was transported to Hamm on March 28, 2001 over a distance of 35 kilometers. As a result, the scaffolding, which is popularly known as the "golf club", escaped scrapping. On September 29, 2002, the converted shaft was ceremoniously put into operation by the then North Rhine-Westphalian Finance Minister Peer Steinbrück . There was also a supporting program with trips to the shaft and tours.

The last official cable ride up the Lerche shaft was carried out by the night shift on July 14, 2011. On the following days the support was expanded and the haulage ropes laid down. The shaft was then filled. Today there is a Protego hood next to the former lawn hanging bench . By 2022, the entire site is to be dismantled and used ecologically.

literature

  • Wilhelm and Gertrude Hermann: The old mines on the Ruhr. Past and future of a key technology. With a catalog of the "life stories" of 477 mines (series Die Blauen Bücher ). Verlag Langewiesche Nachhaben, Königstein im Taunus, 6th, expanded and updated edition 2008, ISBN 978-3-7845-6994-9 , p. 253.

Web links

Individual evidence

  1. ↑ a b Internet presence of the Königsborn colliery
  2. ↑ Cooling for a good climate  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. , Steinkohleportal.de@1@ 2Template: Dead Link / www.steinkohle-portal.de  
  3. ↑ To the Lerche shaft
  4. ↑ The early end of a young mine on industriedenkmal.de, accessed on January 11, 2019.
  5. ↑ The hoisting ropes from the Lerche shaft have been removed . In: Westfälischer Anzeiger , Hamm edition, August 1, 2001, accessed on January 11, 2019.
  6. ↑ Stefan Gehre: Dangerous vandalism: sprayers climb the winding tower and leave smears. In: www.wa.de. March 27, 20 .