The GTK 1100

It claims the crane only needs a set-up space of 60m (200ft) by 20m (65ft) around the base of a wind turbine to be erected, one of its main markets.

The crane transports on four or five trailers, lengths 16m-23m (75ft) with dolly, depending on road regulations: one trailer for the upper boom, two (or possibly just one) trailers for the tower, and two trailers for outriggers, pendant straps and spreaders. The heaviest of the five trailer configuration weighs 140.5t (155 US tons) on an 18-axle Scheuerle self-propelled transporter.

The crane erects in several stages. First, if carried in two loads, the tower is assembled horizontally. Then outriggers attach to the centre of that trailer in an x-shape. A 200t-capacity class mobile crane lifts the upper mast (weighing 55t) to mount on one end of the still-horizontal mast. While the crane holds the upper mast, two side-mounted hydraulic cylinders push, and a third cylinder mounted in the trailer pulls, the lower mast into its vertical raised position. Another hydraulic cylinder mounted to the upper crane at the top of the mast section keeps the upper section vertical as the lower mast rises. Once the mast is vertical, workers in aerial work platforms pin the spreaders to the vertical mast at a height of about 25m. The mobile crane raises the straps to connect to the spreaders. Then the crane’s six-section 76m (250ft) tower, and five-section 60m (200ft) boom, can telescope. The company says that erection takes about six hours. The crane is operated from a mobile workstation that connects to an outrigger.

The crane need not be completely dismantled for site transport. There are three ways of moving it. For repositioning, the GTK can move with its tower retracted and the boom extended. It can also be driven around a site with outriggers still attached, and the tower section lowered down to the horizontal. Users can also remove the outriggers and move the crane around in case the job site lacks the 16m or so of clearance that the crane needs for this kind of movement.

At 11m radius, the crane reaches its maximum lifting capacity of 95t (105 US tons) at a height of about 115m (377 ft). At the same radius, it can lift 43t to its maximum height of about 140m (460 ft). The crane can lift 9.5t to a maximum outreach of about 56m (185ft) at a height of about 95m.

The crane’s pendant straps tend to anchor it, so these load ratings (which include hook block weights) do not require counterweight. But at the show, the firm mentioned, but did not show, an optional Mega Lift 1500 configuration with 60t of counterweight, which beef up the load chart at small and big radii. The Mega Lift system uses a telescoping backboom with a floating counterweight tray. With this system, the crane can lift 95t maximum load out to 14m radius, and 11t to maximum outreach of 56m.

The tower section is powered by a four-cylinder Mercedes-Benz OM904LA, rated at 110kW (150hp) at 2,200 rpm, and a single pump. The boom uses a Mercedes-Benz OM906LA engine that produces a maximum 190kW (258hp) of power at 1,800 rpm. The upper has four piston pumps and three gear pumps.

The GTK 1100 The GTK 1100 GTK 1100 base GTK 1100 base