Overburden Conveyor Bridge F60

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Overburden Conveyor Bridge F60
Panorama of the F60 in the Jänschwalde mine.
Overview
Type	Overburden Conveyor Bridge
Manufacturer	Volkseigener Betrieb TAKRAF
Also called	F60
Production	1969-1991
Model years	1969
Assembly	Germany - Lusatia: Jänschwalde, Welzow-Süd, Lichterfeld-Schacksdorf, Nochten and Reichwalde
Powertrain
Engine	Externally powered electricity, 27 MW (35,000 hp)
Propulsion	2 x rails, 2x bogies (total of 760 wheels)
Dimensions
Wheelbase	56 in (1,435 mm)
Length	502 m (1,647 ft)
Width	241 m (790 ft)
Height	79 m (260 ft)
Curb weight	13,600 t (30,000,000 lb)

F60 is the series designation of five overburden conveyor bridges used in brown coal (lignite) opencast mining in the Lusatian coalfields in Germany. They were built by the former Volkseigener Betrieb TAKRAF in Lauchhammer and are the largest movable technical industrial machines in the world. As overburden conveyor bridges, they transport the overburden which lies over the coal seam. The cutting height is 60 m (200 ft), hence the name F60. In total, the F60 is up to 80 m (260 ft) high and 240 m (790 ft) wide; with a length of 502 m (1,647 ft), it is described as the lying Eiffel tower, making these behemoths not only the longest vehicle ever made—beating Seawise Giant, the longest ship—but the largest vehicle by physical dimensions ever made by mankind. In operating condition, it weighs 13,600 metric tons making the F60 also one of the heaviest land vehicles ever made, beaten only by Bagger 293, which is a giant bucket-wheel excavator.

The first conveyor bridge was built from 1969 to 1972, being equipped with a feeder bridge in 1977. The second was built from 1972 to 1974, having been equipped with a feeder bridge during construction. The third conveyor bridge was built from 1976 to 1978, being provided with a feeder bridge in 1985. The fourth and fifth conveyor bridges were built 1986–1988 and 1988–1991 respectively.

There are still four F60s in operation in the Lusatian coalfields today:^[when?] in the brown coal opencast mines in Jänschwalde (Brandenburg, near Jänschwalde Power Station), Welzow-Süd (Brandenburg, near Schwarze Pumpe Power Station), and (Saxony, both near Boxberg Power Station). The fifth F60, the last one built, is in Lichterfeld-Schacksdorf and is accessible to visitors.

Technology[]

The F60 in Lichterfeld, along the entire length

The F60 has two bogies, one on the dumping side (front) and one on the excavating side (back), which each run on two rails (1,435 mm or 4 ft 8+1⁄2 in standard gauge). In addition to the two rails on the excavating side, there are another two rails for the transformer and cable cars. There are a total of 760 wheels on the bogies, of which 380 are powered. The maximum speed of the F60 is 13 m/min (0.78 km/h) and the operating speed is 9 m/min (0.54 km/h). All in all, the F60 is powered by two large electric motors which supply more than 1,800 horsepower of electricity.^[1]

The F60 has two bucket chain excavators of type on the sides to do preparatory work (see the panoramic photograph from the Jänschwalde mine), one each on the northern and southern crosswise conveyor. They each have an output of 29,000 m³/h (38,000 cuyd/h) (26,448 t/h or 26,030 long ton/h or 29,154 short ton/h), which corresponds to a volume the size of a soccer field with a depth of 7–8 m (23–26 ft). There are nine various overburden conveyor belts with a speed of 10 m/min (0.60 km/h).

The F60, including the two excavators, requires 27,000 kW (36,000 hp) of power. The bridge needs 1.2 kWh (4.3 MJ; 4,100 BTU) of electricity to convey one cubic metre (35 cu ft) of overburden, from the crosswise conveyors up to the dumping at a height of 75 m (246 ft).

The Lichterfeld F60[]

Full length of the F60.

 WikiMiniAtlas

The overburden conveyor bridge of Lichterfeld-Schacksdorf, now shut down, was used from 1991 until 1992 in the brown coal mine near Klettwitz. It is open for visitors today as a project of the (International Mining Exhibition Fürst-Pückler-Land) and is an anchor of the European Route of Industrial Heritage (ERIH).

This F60 is the last of five F60s. The installation was carried out between 1988 and 1991 in the Klettwitz-Nord opencast mine. The F60 began operation in March 1991. Between its commission and its shutting down in June 1992, it moved around 27,000 km³ (6,500 cu mi) of overburden. After the German reunification, the mine became the responsibility of the (Lusatian and Middle-German Mining Administrative Society, LMBV), which closed the mine on the orders of the German federal government and renovated it economically and in a way not harmful to the environment.

Between 2000 and 2010, the Internationale Bauausstellung Fürst-Pückler-Land is pursuing the goal of giving new momentum to the region and the former opencast mine of Klettwitz-Nord has also been integrated into that concept. The mine has been converted into a 'visitors' mine' and the conveyor bridge has been accessible since 1998. Various sound and light installations help make the facility an attraction for visitors.

External links[]

Wikimedia Commons has media related to F60 overburden conveyor bridges.

• Web site about the F60 of the Internationalen Bauausstellung Fürst-Pückler-Land
• F60 via Google Maps in Welzow

References[]