Siegen Hole
The Siegener Loch was a daybreak on the Rosterberg in Siegen in February 2004. Due to its size and the considerable damage to residential buildings, the break in Gläserstrasse became known far beyond the borders of Siegerland .
prehistory
The Hohe Grethe mine was mentioned as early as the 17th century , where thousands of tons of ore were mined from chambers up to 8.5 m in size. Brown stone and spate iron as well as copper pebbles were extracted from several tunnels and most recently also in moderate underground engineering. In 1900 the mine was finally closed.
The Hohe Ley operations department extended under an area of the Rosterberg, through which today the Gläserstraße with dense residential buildings leads. As early as 1961, a building contractor reported that one of his vehicles had sagged, and in April 1965 day breaks appeared.
Security measures have been carried out since 2000, and old tunnels and tunnels were filled in, mostly unnoticed.
Events since 2004
In December 2003 cracks appeared in residential buildings on Gläserstrasse. The responsible mining authority in Recklinghausen commissioned an expert to investigate the formation of the cracks, who traced the cracks back to earth movements caused by mining.
An appraisal was drawn up on February 9, 2004 after the cracks and the subsidence of the subsoil made safety measures necessary. Evacuation in the case of corridors running under the area has been suggested. However, it was rejected. On February 10th, the mining authority's investigations began by drilling.
The first daybreak occurred on February 12, due to the drilling, and part of the basement wall of house 112 fell. The house was therefore classified as in danger of collapse and evacuated. On February 20, the North Rhine-Westphalian Minister for Transport, Energy and State Planning, Dr. Axel Horstmann took a picture on site and promised help.
In spite of the daybreak, drilling continued. A hollow formed between houses 112 and 120, which turned into daybreak on February 25th. This had a diameter of approx. 10 m. A whole birch tree later disappeared in it when the edges of the holes broke away. Other houses were evacuated and the residents were housed in hotels and with friends. According to the Mining Authority, the sole responsibility for the compensation was the mine operator's legal successor, who could no longer be located (mining without legal successor). By the end of February 2004, almost 1,000 cubic meters of concrete had been pumped into the daybreak on the Rosterberg.
On February 10, 2005, the Mining Authority completed the security work in Gläserstrasse. By then, around 22,000 t of building materials had been brought into the mountain. 520 holes with a total length of 14 km were drilled. The state of North Rhine-Westphalia has spent a total of four million euros on the security measures.
In the months of October and November 2008, further day breaks occurred on the Rosterberg, but these were much smaller than in 2004. The safety measures in the area of the Rosterberg and under the Siegerlandhalle continued until the end of 2010. Since 2007, a specialist company from Thuringia has been involved.
See also
Individual evidence
- ↑ Andreas Fasel: Bottomless in Siegen. In: Welt am Sonntag. March 7, 2004, accessed April 5, 2017 .
- ↑ After the 'Siegener Loch' further breaks in the day ( memento from September 6, 2010 in the Internet Archive ) at wdr.de, last accessed on May 31, 2011
Web links
Coordinates: 50 ° 51 ′ 45.8 " N , 8 ° 0 ′ 51.8" E