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TAKRAF refurbishes F 60 Conveyor Bridges for Vattenfall Europe Mining AG

After around 40 years of operation, two F 60 conveyor bridges in Lusatia / Germany, will be refurbished within the next two years.

To ensure operational reliability and stability for a further long-term use of the conveyor bridges several refurbishments will be necessary.
On the basis of comprehensive structural analyses made by TAKRAF during the last years, the large equalizer, roller table, ball and socket joint of Ø1250 and vertical rail of the 60m/33 overburden conveyor bridge in Nochten opencast mine will be replaced, and TAKRAF has been awarded the respective engineering contract.
 
For the F60 conveyor bridge in Jänschwalde opencast mine a replacement of the tie rod heads is scheduled, and TAKRAF has been awarded the respective EPC contract.

The systematically planned refurbishment of load bearing areas is part of a comprehensive program of Vattenfall Europe Mining AG with regard to machine safety for the conveying bridges in particular. The program is based on a close cooperation of equipment operator, equipment supplier and the governmental mining supervision authorities.

 


The most challenging issue in these two projects is to divert the enormous supporting forces of 3200 tons of the large equalizer and of
2 x 2100 tons of the tie rod heads in such a way that it will be possible to replace the parts.

The replacement of the large equalizer and the roller table is planned as follows:
The overburden conveyor bridge will be positioned according to the technological requirements at the time planned for the complex repair in the year 2016 in such a way that the main bridge on the excavator side is lifted by means of the temporary auxiliary construction (support of bridge cross conveyors, shifting and attaching devices for large equalizer and roller table, auxiliary structure) in order to dismantle the roller table and large equalizer with ball and socket joint of Ø 1250.
The replacement technology not only includes the manufacturing dimensions of the large equalizer and the roller table and the transport roadway from the Lauchhammer factory to the Nochten opencast mine, but also the requirements for the installation on site and the transport route in the opencast mine.
 
In the F60 in Jänschwalde the tie rod heads shall be replaced.
It is planned to start the fabrication of the tie rod heads and the load relieving structure in the Lauchhammer workshop in January 2014.
The on-site works in Jänschwalde is scheduled from June to August 2014 during which the tie rod heads will be replaced.
Dismantling and installation will be performed in a three shift working scheme over a period of ten calendar weeks.
The bridge complex will resume operation at the end of August 2014.

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