Basement foundation
| Keller Grundbau GmbH
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| legal form | GmbH |
| founding | 1860 |
| Seat | Offenbach am Main |
| management | Uwe Hinzmann (Head of Central Europe) |
| Number of employees | 500 (in Germany, over 10,000 worldwide) |
| Branch | Special civil engineering |
| Website | www.kellergrundbau.de |
The Keller Holding GmbH is a geotechnical engineering specialist and subsidiary of German parent London-based holding company Keller Group., Whose original nucleus of the 1860 in Renchen (Baden) based company Johann Keller was. The Keller Group has offices in over 40 countries.
The German business is controlled from the headquarters in Offenbach, for the operative business there are ten branches in Berlin (Oranienburg), Bochum, Hamburg-Harburg, Hanover (Isernhagen), Offenbach, Leipzig, Munich (Garching), Renchen, Stuttgart and Würzburg responsible. Head of Central Europe (besides Germany also Benelux countries) is Uwe Hinzmann. His predecessor was Wolfgang Sondermann .
The range of services extends over the entire special civil engineering - from foundations to complete excavation pits, groundwater sealing, subsoil improvement such as jet injection (called Soilcrete at Keller) and deep shaking, building ground explorations, underground construction to securing existing buildings.
Keller employs more than 10,000 people worldwide and generates around € 2.3 billion. In Germany, Keller employs more than 500 people and generates sales of € 120 million.
In the USA, Hayward Baker and McKinney Drilling belong to the group.
history
Keller was founded in 1860 by the well builder Johann Keller (1833–1908) in Renchen (where Keller is still located today). In 1900 the company had around 150 employees and in the same year was sold to the engineer Johann Degen (1862–1903), because Johann Keller was ill and had no descendants (he continued to manage the company until his death). The company expanded under the ownership of the Degen family and the headquarters were moved to Frankfurt am Main in 1930. After a branch was established in Portugal in the 1930s as part of a major order for a water supply system in Lisbon , the company also expanded significantly abroad through acquisitions after the war-related reconstruction in the 1960s. In 1974, Keller was taken over by the British technology group Guest, Keen and Nettelfolds ( GKN ) (after which it was called GKN Keller from 1976 to 1990) and moved its headquarters from Frankfurt to nearby Offenbach. In 1994, the Keller Group plc holding went public in London.
Keller attracted attention as early as the 1930s with the development of its own deep vibration method (patent 1933, first order 1936) to improve the subsoil (initially during demonstration tests as part of the founding of the congress hall in Nuremberg ). In 1939 Berlin reached a compaction depth of 35 m. Another focus was groundwater lowering, for example during the construction of the Berlin subway from 1934 to 1939. An early major project was the fourth port entrance in Wilhelmshaven (where Keller already had a branch in the 1930s), where Keller helped lower the groundwater from 1937 to 1942 Large filter well carried out.
In the 1970s, new depth vibrators and vibrators for mortared tamping columns (first in 1976) and concrete vibrating columns were developed. The first Soilcrete order in Germany took place in 1979 and the Soilfrac method (which, for example, enables building elevations) to be used for the first time in 1986.
Web links
Individual evidence
- ↑ a supplier to the automotive and aviation industries whose roots go back to the origins of the industrial revolution in the 18th century