Liebherr LG 1750 - Franz Bracht
The largest crane used by Franz Bracht is this Liebherr LG 1750, in the meantime the crane has left Bracht's fleet. It is a 750 tonne crane on an 8 axle crane carrier.
The crane war shortly before my visit erected. The counterweight is skipped over from the tray onto the superstructure with the Liebherr LTM 1160/2. During transport over the road the undercarriage takes the outriggers with it, see Dufour. The superstructure is taken on a trailer.
The undercarriage is powered by a Liebherr 8 cylinder diesel engine with 686 hp. Four axles are driven, all axles are steerable.
The outrigger base measures 12.32 x 12.08 meters when the crane is in operation with the derrick boom. When the main boom is used only the crane can be rigged with the 16 x 16 meter outrigger base.
The derrick boom and tray are in this case only required to erect the long main boom. The derrick boom is 31.5 meters long.
The large crane operator cab is properly reachable due the walkways around the superstructure.
On this photo the crane is fitted with 170 tonnes of counterweight, that can be extended up to 245 tonnes.
Fitted with a 133 meter main boom and special wind turbine jib in SL7 DHS configuration. The boom can be extended by another 14 meters to 147 meters. The max. capacity of the crane in this configuration is 105 tonnes on a 18 meter radius.
The tray is as required filled with counterweight and attached to the derrick boom. Bracht is using here official Liebherr counterweight slabs with 12.5 tonnes and universal counterweight that weights 6.3 tonne per slag. To erect the long main boom is about 200 tonnes of counterweight required.
Meanwhile is the crane fitted with 220 tonnes of counterweight.
The crane is ready to install the wind turbine. The assembly of the wind turbine takes about 2 to 3 days, depending on the weather.