Sparkasse Hagen tower

The Sparkasse Hagen tower (German: Sparkassenhochhaus Hagen, Verwaltungshochhaus/Verwaltungsgebäude der Sparkasse Hagen[3][8][9]), often referenced as Langer Oskar[4][9][10] (Long Oskar) by locals, was a 101 m (331 ft) skyscraper in the city centre of Hagen, North Rhine-Westphalia, Germany. The building served as the main office tower and part of the headquarters of the resident municipal savings bank, Sparkasse Hagen. Built in the early 1970s it was a regional landmark for nearly three decades until demolition in 2004. It was replaced by a lower building complex, called Sparkassen-Karree Hagen,[11] which was inaugurated in 2006.

Sparkasse Hagen tower
The building a few weeks before implosion
Alternative namesLanger Oskar
General information
StatusDemolished
TypeCommercial offices
Architectural styleModernism
LocationKörnerstraße 22
Hagen, Germany
Coordinates51°21′35″N 7°28′18″E
Construction started1 August 1972[1]
Completed29 November 1975[2]
Demolished7 March 2004[3]
OwnerSparkasse Hagen
Height
Antenna spire101 m (331 ft)
Roof98 m (322 ft)[4]
Top floorca. 95 m (312 ft)
Technical details
Floor count21
2 below ground
Floor area12,634 m2 (135,990 sq ft)
Design and construction
ArchitectKarl-Heinz Zernikow[1]
References
[5][6][7]

Construction

Construction began 1 August 1972 and finished on 29 November 1975. It was inaugurated on 29 November 1975. It was named after the director of the savings bank at that time, Oskar Specht. The architect of the building was Karl-Heinz Zernikow from Hagen.

The cultivated surface amounted to 634 m2 (6,820 sq ft) the effective area 12,634 m2 (135,990 sq ft) (office surface: 7.621 m (25.00 ft). The building had 22 projectiles, of it 2 basements, the building height over the upper edge of the area was 98 m (322 ft), the building length of 37 m (121 ft), the building width approximately 18.5 m (61 ft).

The front consisted of a pre-hung aluminum construction with a surface of 10,300 m2 (111,000 sq ft). The converted area amounted to 57,000 m3 (2,000,000 cu ft). A characteristic was the constant reinforced concrete slab, which served the balance of the building for the elevator pits: 113 by 9 m (371 by 30 ft), and 1.72 m (5 ft 8 in) thick.

Water leakage penetrated, and damaged building insulation. Repairs would have required further measures, including improvements to the air conditioning system and installation of a second stairway for fire safety reasons. Repair costs were estimated at €42 million. It was estimated that demolition would cost 5 million euro and construction of a new building would cost €16.8 million. Therefore, it was decided to demolish the current building and construct a new one.

Demolition

The building was explosively imploded at 10:53 on 7 March 2004, in the then-largest and riskiest breakup of a multistoried building in Europe. 1,450 explosive charges weighing 250 kilograms were used in timed sequence to cause 26,000 tons concrete and steel to first fold and then collapse into a predetermined 70 m (230 ft) bed without damaging neighboring structures. The successful breakup is considered as master achievement of the specialty firm from Thuringia and receives an entry in the Guinness World Records.

  • Layout of the original building's narrow side
  • Implosion on 7 March 2004
  • The building's place one week after the implosion
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References
  1. Kramer, Ingo. "Langer Oskar" (in German). Retrieved 15 June 2013.
  2. "Kleiner geschichtlicher Abriss der Hagener Stadtgeschichte" (PDF) (in German). Hagener Heimatbund. Retrieved 15 June 2013. ... Sparkassenhochhaus wird seiner Bestimmung übergeben...
  3. "Mitten in der Stadt: In Hagen wurde ein 98-Meter-Hochhaus gesprengt" (in German). Kölner Stadt-Anzeiger. 7 March 2004. Retrieved 15 June 2013.
  4. "Die Sprengung des Hagener Wahrzeichens – Der Fall des Langen Oskars" (PDF) (in German). rekonform – Zeitung für das Bauen im Bestand. August 2004. Retrieved 15 June 2013.
  5. Sparkasse Hagen tower at Emporis
  6. "Sparkasse Hagen tower". SkyscraperPage.
  7. Sparkasse Hagen tower at Structurae
  8. "Referenzsystem 5: Sparkassenhochhaus in Hagen" (in German). DFG-Forschergruppe 500 Computergestützte Destruktion komplexer Tragwerke durch Sprengung. Retrieved 15 June 2013.
  9. von Karczewski, Christof (June 2004). "Verwaltungsbau im Stadtbild" (PDF) (in German). Deutsches Architektenblatt AKNW. Retrieved 15 June 2013.
  10. auf der Springe, Klaus (2007). "Complex Building Automation – Energy Efficient New Construction of Hagen Sparkasse" (PDF). International Network for Information on Ventilation and Energy Performance. Retrieved 15 June 2013.
  11. "Hagener Sparkassen-Hochhaus wurde gesprengt. Mega-Sprengung: Langer Oskar gefallen" (in German). RP Online. 7 March 2004. Retrieved 15 June 2013.

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