Liebherr LTM 11200
The Liebherr LTM 11200 is the most powerful mobile crane in the world. It is produced by the Swiss company Liebherr in Ehingen , Germany. The maximum load capacity on the hook is theoretically 1200 tons (t) at a distance of 2.5 meters (m) from the axis of rotation and 202 t of counterweight. Without all the special equipment, the maximum possible load is 363 t over 3.5 m. The full name of the crane is LTM 11200-9.1 .
This crane was officially presented in April 2007 at Bauma in Munich, the world's largest trade fair for construction machinery. The crane was designed as an all-terrain crane (AT crane), which means that it can be driven and used both on and off the road. The type name of the crane is built up of the following items: LTM stands for L iebherr T elescopic M obilkran, 11200 after a leading 1 , the load capacity of 1200 t, and 9.1 to 9 axles of the chassis and the version number 1 .
Structure and technology
Basic device
Chassis and steering
The chassis with its 9 axles has a newly developed rear-axle steering that reacts and actively steers depending on the speed. It steers axles 6 to 9 electro-hydraulically up to a speed of 30 kilometers per hour (km / h). Between 30 and 60 km / h axles 6 and 7 are set to straight-line stability and locked, while axles 8 and 9 actively steer, from 60 km / h the entire rear-axle steering is set to straight-line stability. This achieves good driving behavior, off-road mobility and a tight turning circle for a vehicle of this size. The steering is a hydraulic 2-circuit steering system from ZF Friedrichshafen (ZF). The suspension is hydro-pneumatic and has an automatic level control. The axles are all individually fitted with tires of size 14.00 R 25 .
To support the LTM 11200, four swivel bars are hydraulically folded out and extended. Support and level adjustment are also carried out hydraulically.
Drive the chassis
The undercarriage is driven by an 8-cylinder diesel engine with turbocharger (type: D9508 A7 ) developed and built by Liebherr . The engine has a maximum output of 500 kilowatts (kW) and transfers its maximum torque of 3000 Newton meters (Nm ) to axles 1, 2, 4 and 5 via an automatic transmission from ZF (type: TC-TRONIC ) via a torque converter and intarder and has twelve forward and two reverse gears. The chassis with its nine axles is fully equipped with disc brakes. In addition, the vehicle is equipped with exhaust flap brakes and eddy current brakes. The parking brake acts on all axles from 3 to 9.
Crane body / superstructure
Like the undercarriage, the uppercarriage is powered by a Liebherr turbodiesel engine. A 6-cylinder engine (type: D936L A6 ) with an output of 270 kW and a maximum torque of 1720 Nm is used for the engine of the upper structure . The power transmission to the crane drive takes place diesel-hydraulically via axial piston variable displacement pumps for lifting, rotating and adjusting the lattice tip in a closed circuit and for rocking and telescoping via axial piston pumps in an open circuit. A hydraulic axial piston adjustment motor is also used for the lifting drive.
boom
Boom performance
In addition to the largest load capacity, the LTM 11200 also offers the longest telescopic boom in the world that is currently available for a road mobile crane. It reaches a hook height of 100 m on the telescopic boom. The maximum system height of the crane with the luffing jib installed is 195 m. According to the manufacturer, the crane can lift 106 tons of load to a height of 80 meters with a radius of 12 m.
Construction of the boom
The boom consists of eight parts that are automatically extended to the required length. The telescope segments are also secured, "bolted", automatically. The telescopic boom can be supplemented with various grille extensions to expand its range of applications. With a Y-telescopic boom guying , the performance can be further increased, especially when using lattice mast elements.
The crane can be operated with both the four-part 55 m boom (type: T3 ) and the eight-part boom (type: T7 ) of 100 m length. The four-part version consists of the basic segment and the lower three extensions of the long T7 boom. A short space tube adapter is bolted to the third extension using four eyelets and a roller head is attached to it. The four-part boom can be converted into an eight-part boom with a length of 100 meters by removing the tubular space adapter and installing the four upper telescopic extensions.
Others
The boom must be dismantled for road transport, as the basic unit alone weighs 108 tonnes and otherwise the maximum axle load of 12 t per axle permitted in road traffic will be exceeded.
The dismantling takes place without an additional auxiliary crane. The boom is equipped with four hydraulic telescopic supports with which it is supported on the ground. The boom can then be separated from the base unit and this can be moved out from under the jacked boom. The luffing cylinders remain on the basic device. For transport, the boom is lowered onto a transport vehicle on which the special delivery saddles are located. The Y bracing can remain on the boom. The transport weight is up to 104 tons, depending on the version. Therefore, in Germany, the 100 m mast is usually not transported on public roads together with the mast guy.
Technical specifications
(all information according to the manufacturer's website)
Dimensions
- Total width: 3.00 m
- Total length: 19.939 m
- Total height: with luffing jib up to 188 m (hook height: up to 184 m)
- Total weight: 108 t ready to drive
Undercarriage / chassis
- Number of axes: 9
- Driven axes: 1, 2, 4, 5
- Steering: all axles steerable, active rear axle steering of axles 6 to 9
- Drive / steering: 18 × 8 × 18
- Driving speed: up to 75 km / h
Upper structure / crane structure
- Max. Load at reach: 1200 t at a radius of 2.5 m
- Telescopic boom: eight-part, extendable from 18.3 to 100 meters hook height
- Length of the lattice top: 24–126 meters
Engine power
- Engine undercarriage
- Engine type: Liebherr D9508 A7, 8-cylinder turbo diesel
- Chassis engine power: 500 kW (680 PS) and 3,000 Nm
- Tank capacity: 600 liters
- Motor crane (superstructure)
- Engine type: Liebherr D936L A6, 6-cylinder turbo diesel
- Power superstructure engine: 270 kW (367 hp) and 1,720 Nm
- Tank capacity: 300 liters
ballast
- Total ballast: 202 t; composed of the base plate with 22 t, 16 central ballast parts with 10 t each and 4 side parts with 5 t each
LTR 11200
The Liebherr LTR 11200 is the most powerful telescope - crawler crane in the world. The turntable, boom and lattice jibs have been adopted almost identically from the LTM 11200-9.1. The chassis and crawler tracks, on the other hand, were specially developed for the LTR 11200. The crawler crane was designed for wind turbines and especially the spatial conditions in onshore wind farms . With its width of just 4.8 meters, the narrow chassis allows driving maneuvers even in confined spaces. It can also be moved in an upgraded state.
Web links
Individual evidence
- ↑ a b Technical data