Mobile crane

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Modern Faun truck crane of the Bundeswehr in working position with the crane extended

A vehicle crane or mobile crane (also mobile crane or mobile crane called) is a mobile jib crane on a wheeled or tracked vehicle .

The first powerful mobile cranes were developed in the 1960s. They already had diesel-electric and diesel-hydraulic drives and were able to move heavy loads quickly and safely with a telescopic boom. In the course of the following decades, the range and the maximum possible payload were continuously improved.

commitment

Areas of application

1,250 t crawler crane erecting a reactor
Trailer crane in the driveway of an inner courtyard
750 t crawler crane Liebherr LR 1750 with 200 m boom
Liebherr mobile crane for recovering crashed racing cars at the Circuit de Monaco

Mobile cranes are indispensable helpers for the construction industry and heavy transport. They are used when stationary cranes are not available on site or they cannot be used.

The areas of application of mobile cranes are:

Smaller mobile cranes on lighter chassis are used on narrow construction sites in the city center due to their dimensions.

Smaller mobile cranes are used in:

  • Roofing / roof renovations
  • Carpentry work
  • Glazing
  • Chimney work
  • Solar installation
  • Pruning
  • Use as an aerial work platform

Resource planning

Japanese Army mobile crane

In order to avoid unforeseen problems and dangerous improvisations by the crane operator, all necessary information about the approach, about the investigation of the operating conditions on site, about the lifting coordinates of the load transport as well as the properties and attachment options of the load must be obtained. This information serves as an important basis for a safe and smooth operation. The appropriate crane is selected depending on the weight of the load, the required lifting height and radius as well as the local conditions at the place of use and the type of crane operation. When using cranes in inner-city areas, it must be clarified beforehand whether a partial or complete road blockage is necessary. The crane driver must be informed whether special sling or load handling equipment is required, whether a guide, possibly with radio, is required and whether additional material is to be carried to support the crane.

The route is to be determined taking into account the dimensions of the clearance heights and widths and the maximum permissible road and bridge loads. The ground conditions at the intended location of the crane must be checked and whether there are structures or trees or electrical overhead lines in the vicinity that prevent necessary crane movements. When choosing the location, make sure that there is sufficient space to extend and support the supports while maintaining the safety clearances to construction pits, embankments and structures. In order to check the feasibility of the crane work, a previous inspection of the place of use is therefore often unavoidable. Ultimately, the question also needs to be clarified whether the weather forecast allows for the upcoming crane work. Smaller truck-mounted cranes on light chassis with a permissible total weight of 7.5 t or 12 t do not require any major operational planning because they do not exceed the maximum weights for road traffic. Due to their compact dimensions, they are also suitable for narrow, difficult-to-access construction sites without extensive planning of the deployment being necessary.

Mobile crane operator

As an indispensable aid for the construction industry and heavy haulage, truck-mounted crane drivers operate mobile cranes worth millions and work primarily for crane operators and construction companies. The areas of application are varied; They are mainly used in the assembly of precast concrete parts and the erection of steel structures, especially in building construction and bridge construction . In addition, truck-mounted crane operators are also used for rescue work, difficult loading work for heavy haulage or for the assembly of large tower cranes. These are often relatively short, rapidly changing assignments, sometimes in difficult terrain or in factories.

Truck crane operators have to carefully select the location of the truck crane at the most varied of locations with constantly changing operational conditions. At the place of use they have to decide whether they can carry out the crane job or not, because almost all of the responsibility rests on them, including for the people working in the area and the property there. The truck-mounted crane driver usually has to assess the subsurface at the crane's installation site or estimate it himself, from which he derives the necessary measures for a stable foundation for a safe installation.

The precise transport of loads - even with large overhangs and boom extensions - requires the truck crane operators to constantly concentrate and have a great deal of sensitivity. The safe and smooth use of the truck crane requires extensive knowledge and ongoing practice from the truck crane driver in order to be able to safely set up and upgrade the crane as well as transport loads with the crane, even in cramped construction site conditions.

Due to the extensive tasks of the truck crane operator, the dangers that arise in crane operation and the mostly difficult load handling when using a crane, crane operator training is therefore absolutely necessary, as improper operation can endanger people and property and cause serious accidents. In addition, detailed instruction on the relevant crane type must be provided by the crane operator or manufacturer.

The future or young mobile crane operator should only be introduced to the usual professional activity with various, initially simple crane jobs under the guidance of an experienced mobile crane operator. The selection of suitable slinging and load handling equipment is also the responsibility of the crane operator. When driving on the road, the crane driver must observe the relevant regulations of road traffic law. When using a crane, the operating regulations for cranes of the employers' liability insurance association and the instructions of the crane manufacturer must be observed.

In addition, the tasks of the crane operator include maintenance, care and the elimination of simple faults in the crane. In Germany there is still no job description for crane operator training and therefore no regular training for this profession. Various educational institutions offer courses to acquire basic knowledge and skills. Entrepreneurs often expect prospective mobile crane operators to have practical experience in handling mobile cranes and to work prudently, as well as the ability to act reliably and responsibly. In Austria , training with an examination according to the Employee Protection Act is required. The training time is around 33 hours. Institutes authorized by the Ministry of Economic Affairs, but also civil engineers, are allowed to conduct training courses and examinations and issue crane licenses. If you pass this test, you are granted permission to work with all mobile cranes. Shorter additional training is required for construction cranes .

Crane operators are particularly challenged by emergency organizations such as the fire brigade . If people are normally not allowed to stand under the hovering parts of the crane, when rescuing people it is often necessary that parts have to be lifted over people who are trapped or buried. In contrast to other operations, it is not the operations manager who is responsible, but the crane operator, similar to a vehicle driver. For members of the volunteer fire brigade , who often do not have the knowledge of a professional crane operator, the necessary experience must be increasingly balanced with exercises and special training .

technology

Trackless mobile cranes are divided into

  • Truck cranes, non-all-terrain, high-speed road cranes
  • all-terrain low-speed runners with telescopic booms (rough terrain cranes)
  • All-terrain cranes (AT cranes) with the advantages of the other two types of crane: off-road mobility and fast maneuverability (always as a wheeled vehicle)
  • Crawler cranes

All four types are cranes with a lattice boom or a hydraulically extendable telescopic boom and consist of an undercarriage and an uppercarriage . The definition of the terms mobile crane and truck crane is not clearly defined in general usage, as the differences can hardly be distinguished from one another due to the constant technical development of such cranes. Truck cranes have up to ten axles and, as wheeled vehicles, are subject to the statutory provisions of the Road Traffic Licensing Regulations ( StVZO ).

Due to the permissible axle load of 12 tons (t) per axle on public roads, truck-mounted cranes with a maximum load of around 50 t can only carry part of the total ballast. The remaining counterweight parts must be loaded separately onto transport vehicles.

The vast majority of today's mobile cranes are compactly built, road and all-terrain mobile cranes, so-called AT cranes (All Terrain). They have up to nine axes, all of which are hydropneumatically suspended and can be hydraulically locked for crane operation. Most of the axles are driven and steered. The independent steerability of the rear axles to the front axles enables small turning radii and lateral movement for easy maneuvering of the crane in tight spaces. The large-volume individual tires with a special profile make it possible to transmit large feed forces and provide high ground clearance. Lockable longitudinal and transverse differentials, together with the hydropneumatic axle suspension, ensure good traction even on difficult terrain.

Support of a FAUN mobile crane

The wheels are driven by a diesel engine via an automatic transmission with a torque converter or an automatic converter-powershift transmission. From there, a transfer case with off-road transmission transmits the drive force via cardan shafts to the axle drives. The highly stressed vehicle frame of the undercarriage is a torsion and bending-resistant box construction into which the support tunnels for the hydraulically extendable support beams are welded.

Upper structure, vehicle frame and support for an all-terrain crane (Terex Demag AC 60 City)

In crane operation, the forces and moments introduced into the slewing ring by the superstructure are transferred from the vehicle frame to the support. The support beams with the attached support cylinders considerably increase the standing area, which means that high load-bearing capacities are achieved with sufficient stability. To increase the stability, ballast plates made of cast steel are mounted at the rear end of the rotating crane structure, the superstructure . The amount of counterweight on the superstructure frame can be adapted to the load-related load required by different ballast variants.

The permissible load capacity depends on the overhang and jib length, depending on the respective set-up status. The maximum load is limited by the stability and strength of the components such as the boom, slewing ring and vehicle frame.

The assemblies for the main functions of the crane, such as hoist, slewing gear, luffing gear and the boom system are housed on the superstructure.

The load-bearing welded structure of the superstructure is the rotating platform; In its function it is an erecting frame for the boom and a bearing block for the boom and luffing cylinder. During crane operation, it transfers large forces from the boom to the vehicle frame via the slewing ring.

The winch frame and ballast are located at the rear end of the turntable. Often, a second hoist can be bolted to the end of the turntable for two-hook operation or to adjust a luffing lattice jib on large vehicle cranes.

The superstructure frame is also used to accommodate the crane driver's cab, the superstructure hydraulics and a second diesel engine to drive the hydraulic pumps in the superstructure for cranes with a load capacity of around 60 to 80 tons.

All crane functions are carried out by hydraulic drives due to the simple, stepless control and the low susceptibility to failure. Funded by the hydraulic pump pressure oil lines on the respective hydraulic motors fed and hydraulic cylinders. The actuation of the hydraulic drives for the individual crane movements takes place via electrically controlled proportional valves.

A load torque limiter prevents overloading the crane. Under the criteria of the risk of tipping over and the strength of components, this switches off all crane movements that increase the load moment if the maximum permissible load is exceeded.

Electronic displays support the crane operator's activities by showing him all relevant crane data and signaling limit states in good time. The very high level of technical development of today's mobile cranes and the special operating conditions place high demands on the operating personnel, mobile and truck crane drivers.

Lattice boom crane

Lattice
boom crane with derrick boom
Lattice boom crane

Lattice boom cranes can be adapted to a wide variety of lifting tasks thanks to the variety of jib systems that can be set up at different heights. Lattice boom cranes are primarily used where telescopic cranes can no longer achieve the required load capacities or in the form of crawler cranes when moving with a load is required.

When it comes to lattice boom cranes, a distinction is made between crawler cranes, platform cranes and lattice boom vehicle cranes. Crawler cranes allow moving with a load, lattice boom cranes allow the rubber-tyred sub-frame to move independently, while platform cranes cannot be moved. Europe's largest truck-mounted crane, i.e. a vehicle whose basic device can be moved with road approval, is the Gottwald AK 850-103, which was built in 1982 for the Munich company Schmidbauer KG by Leo Gottwald in Düsseldorf and after an extensive general overhaul in 1998 at AKS in Nuremberg worked for Schmidbauer until August 2007. It was also disputed whether the Liebherr LG 1750 (operators in Germany: Nolte, Maxikraft, HN Krane, Franz Bracht and Grohmann Atollo) has not been the largest truck-mounted crane in Europe since Bauma 2004. De facto, however, the performance of the LG 1750 does not match that of the Gottwald AK 850 in extreme cases; instead, in addition to the main boom, it can use both the rocker and the counter boom at the same time; the AK 850, on the other hand, only offers one of the two additional options. Since the sale of the AK 850-103 to Blue Wheelers (Australia) in 2007 , Europe's largest truck-mounted crane is no longer an 1100-t crane, but only the LG 1750, which can lift a maximum of 750 t. The TC lattice-boom mobile cranes are also available in large numbers 2400, TC 2600 and TC 2800 from Terex-Demag, the leading manufacturer of lattice boom cranes.

Demag is by far the market leader for lattice boom cranes over 300 t.

Telescopic crane

500-ton mobile crane with telescopic arm (Liebherr LTM 1500-8.1)

Telescopic cranes are quickly on site and are suitable for relatively short, rapidly changing jobs, lifting work of all kinds and for special cases. They are built in series up to a load capacity of 1200 t, reach lifting heights of well over 100 meters (m) with attached jibs and can move loads of several hundred tons. Your advantages are shorter set-up times , the low space and personnel requirements during the set-up process and mostly the possibility of telescoping loads (retraction and extension of the telescope with load).

The hydraulic drives for controlling the individual crane movements are operated via electronically controlled proportional valves , which means that three to four crane movements can be carried out carefully at the same time.

The telescopic boom is the heart and the defining feature of the telescopic mobile crane. The telescopic boom is a hydraulically telescopic steel structure; it consists of the boom body and usually three to five telescopic steps, one inside the other, in a welded solid wall box construction made of high-strength fine-grain structural steel . Some manufacturers of smaller truck-mounted cranes have switched to making the telescopic mast from a special aluminum alloy .

The oval boom profile of modern mobile cranes enables excellent load capacities and reduces the weight of the boom compared to previous cross-sectional profiles. The telescopic steps slide on lubricated polyamide sliding jaws when extending and retracting and can usually be extended even under partial load. They are pushed out and in either simultaneously or one after the other from the built-in telescoping system using long internal single-stage and / or double-stage hydraulic cylinders . The hydraulic cylinders, especially in the case of small and medium-sized telescopic cranes, can be combined with tried and tested single or double rope hoists to extend the upper telescopic steps in order to keep the weight of the boom and the boom's center of gravity low.

Depending on the number of telescopic steps, the type, number and arrangement of the hydraulic cylinders in the hollow interior of the boom is different depending on the crane type and manufacturer. In the case of large telescopic cranes, the telescopic steps are positively locked together after they have been extended to relieve the telescopic cylinders (from approx. 130 t to 160 t maximum load capacity). The design of many telescopic units also requires the telescopic stages to be locked together. In older boom systems, it is done from the outside on the collar plates of the individual boom sections via pneumatic or hydraulic bolting cylinders.

In today's telescopic cranes, which reach boom lengths of up to 100 m when fully extended, only a single-stage hydraulic cylinder with locking head mounted in the base body of the boom pushes out all telescopic stages one after the other. The telescopic steps are bolted together from the inside with cantilever bolts pretensioned by compression springs and do not require any energy supply. The locking head in the area of ​​the boom base locks on both sides in the base of the telescopic step to be extended and unbolted it immediately afterwards from the next larger boom section. After each telescopic step has been extended, it is bolted. The locking head is then unlocked and the telescopic cylinder is retracted. The next telescopic stage can be extended.

A 500 t telescopic crane (Terex-Demag AC 500-2 with lattice boom luffing jib)

The telescopic mechanism is designed in such a way that a telescopic step can only be unlocked when the telescopic cylinder is locked to the telescopic step and vice versa; the telescopic steps are therefore always held by the telescopic cylinder with each bolting and unbolting. The telescopic steps have up to four positions for bolting to the next larger telescopic part, which enables numerous extension states of the boom. After specifying the desired boom length when setting the set-up state in the load torque limiter, the telescopic steps can be fully automatically extended in the optimal extension sequence and length. Conventional telescoping systems have a higher dead weight than the single-cylinder telescoping system, especially with long booms.

The boom foot is mounted in the two side shields of the superstructure frame. With one or two luffing cylinders, the telescopic boom can be raised up to an angle of 77 to 83 degrees. In order to achieve a greater lifting height or radius, telescopic booms can be extended with a rigid or luffing lattice mast tip. In order to counteract the elastic deflection of the telescopic boom, the telescopic booms of large telescopic cranes are often braced to increase the load capacity and the working precision with long booms and wide overhangs. The telescopic boom guying essentially consists of a guy winch, the guy stand, the guy rods and the guy rope.

Mobile telescopic cranes are a special form. These are based on mobile excavators and have a telescopic boom with crane hook instead of the excavator arm. To extend the telescopic arm, a lattice mast can be mounted, with which a further extension of three to five meters can be achieved. In addition, claws can be extended for higher loads . The machines can also be equipped with an elevating cabin and a remote control. These machines have an operating weight of almost 20 t and a load capacity of around 15 t.

Grove's fully hydraulic tower cranes are a mixture of a top-slewing tower crane and a telescopic crane . They are transported in several parts. A crane tower is erected hydraulically, telescoped out in several stages and bolted automatically in each case. A telescopic crane with a drive unit rotating on the tower is also lifted. In 1974 the first "universal hydraulic assembly crane" GCI 5400 with a telescopic lattice tower in four operating heights and lattice mast boom was presented, the GCI 5402 then had a telescopic boom. From this series there was also GCI 4200 and the bottom rotating GCI 7500 was a tower crane with a luffing jib. Then the development of this concept rested for a long time. The first Grove GTK 1100 was delivered at the end of 2007 . The six-part telescopic tube tower is braced four times against the supports and carries the remotely controlled "superstructure", a slightly modified GMK 7450. It is mainly used for the construction of wind turbines. Compared to other mobile cranes, it only requires a small footprint, especially for assembly, and reaches heights of 140 m.

Crawler crane

Liebherr crawler crane LR 1600/2
600 t crawler crane Terex-Demag CC 2800-1
Crawler crane in the Hohenahr wind farm shortly before the rotor star pulls (Terex-Demag CC ...)
Liebherr LTR 11200 crawler crane

Crawler cranes are used, for example, in order to be able to move a raised load, which mobile cranes on wheels can only to a limited extent on level and stable ground with a lower load. To do this, they work without additional support. They are mainly used for large assemblies in building construction and plant construction, but also for the construction of wind turbines .

Crawler cranes are heavy, slow and not marketable; the set-up times are correspondingly long. For transport to the building several trucks and loader or heavy transport vehicles required.

Due to the large contact area of ​​the caterpillar chain , the crawler chassis is characterized by a relatively low ground pressure , which makes it easier to move under load. The crawler track is driven hydrostatically . The caterpillars can be controlled in opposite directions, which means that the large device can rotate around its own axis even in the smallest of spaces. For transport to the construction site, the caterpillar ships can be pegged down and transported separately to the site. The crane structure is often similar to that of lattice boom truck cranes. All winches, the slewing gear and the running gear are driven by a diesel engine in the superstructure via a pump distributor .

Crawler cranes are mainly used when the ground conditions are unfavorable for mobile cranes due to the lack of construction site roads and difficult terrain, for example when setting up wind turbines. They are also preferably used when there are high demands on the load capacity, lifting height and reach, such as heavy crane work in power plant and industrial construction.

Today, the construction of wind turbines is carried out almost exclusively with crawler cranes. After the wind turbine has been set up, the cranes are dismantled and transported to the next wind turbine construction site. Special cranes such as the CC 2800-1 NT from Tadano Demag are used to set up wind farms . NT stands for "Narrow Track" or freely translated for "narrow road". When fully equipped, the CC 2800-1 NT can drive from wind turbine to wind turbine within a wind farm on paths that are only 5 m wide . This saves dismantling, transport and reassembly of the crane and significantly more systems can be erected in the same period of time. Due to the small footprint, however, supports are necessary so that they cannot be moved under load. The construction of offshore wind turbines are floating cranes or installation vessels used.

A mobile crane folds up in Erlangen.

Largest truck-mounted cranes in the world

Liebherr LTM 1750-9.1

The crane was presented to the public in Ehingen in June 2009. The first devices were delivered to customers in February 2013. The 9-axis machine is characterized by the fact that the complete telescopic boom can be carried on public roads. The mobile crane is designed for particularly short set-up times. With the 52 m long telescopic boom, the Y telescopic boom guying and different lattice jibs, the crane has a large number of boom systems and reaches lifting heights of up to 154 m and jibs of up to 112 m.

Liebherr LG 1750

The Liebherr LG 1750 (first vehicle delivered in 2004 to Nolte Hanover) is the highest road mobile lattice mast truck crane in the world with a hook height of 194 m. The load capacity is 750 t on a 7 meter radius. The entire superstructure has to be dismantled for road travel, as the upper edge of the supports has already reached the 4 meter mark.

Liebherr LR 1750

Crawler crane LR 1750 with SX2 boom system from HÜFFERMANN crane service

The LR 1750/2 crawler crane is used in power plants, refineries, on bridge construction sites and when assembling wind turbines. The compact dimensions of the crane components and moderate individual weights enable economical crane transport to the construction site. Lifting heights of up to 191 and a radius of 156 meters can be achieved. The first delivery of the caterpillar with the SX2 system went to Hüffermann Krandienst GmbH, Wildeshausen.

Gottwald AK 850/1100 GT

The Gottwald AK 850/1100 GT (built in 1982 for Schmidbauer KG Munich, first conversion including upgrading in 1998) was the most powerful road mobile crane in Europe until 2007. During the conversion, the superstructure was divided in order to reduce weight in order to comply with road loads. The load capacity is 1,100 t. It only exists once in the world. The Schmidbauer KG crane was the only one in Europe and the only device with this conversion that ran for Schmidbauer until the beginning of August 2007. In 2007 the crane was sold to Blue Wheelers Ltd. in Australia . sold, in 2010 he came to India to the Shetia company .

Another AK 850, which had already been delivered to Toense in 1984 with a split superstructure, was named AK 850-104 or -GT and was sold to Interlift UK Ltd. in 1988 . charged to the AK 912 GT. Interlift was the European subsidiary of Al Jaber Est. from Abu Dhabi / UAE, so that the crane was also used in the United Arab Emirates. Towards the end of the 1990s the crane was sold to Baldwins and from then on worked again in Europe. After the Baldwins Group was dissolved and taken over by Ainscough , the crane was bought by ALE Abnormal Load Engineering and used worldwide. In 2008 in Tunisia an engine fire in the undercarriage irreparably destroyed the front section. Since then, ALE Heavy Lift has been using the crane as a base crane after its repairs and transports it on a low bed.

The scope of delivery of the AK 850-104 in 1984 also included a six-axle Gottwald transport vehicle for the rear section of the superstructure with the designation AK 850-63 TR. However, this was retired and scrapped in Baldwin's time. Despite the major dismantling for road travel, the ten-axle basic machine weighs 96 t, is 22.88 m long, 4 m high and 3 m wide. Its hook alone weighs 24 t.

Demag AC 700

The Demag AC 700 is the weighted version of the Demag AC650. It has a maximum lifting capacity of 700 t and weighs 125 t with the Superlift device , but can be lightened to 108 t. In road conditions, this weight lies on nine axes that move the 20.66 m long device through the streets. A prototype of the AC 1000 is currently in test operation.

Liebherr LTM 11200-9.1

The LTM 11200 offers a nominal load capacity of 1,200 t and is therefore the most powerful telescopic mobile crane and the most powerful road mobile crane in the world. The nine-axle basic vehicle can be moved with the eight-part boom, which, when extended, reaches a height of 100 m. Ready to drive, the device weighs 108 t; However, the boom must be transported on an additional vehicle.

Gottwald AMK 1000-103

The Gottwald AMK 1000-103 with a nominal load capacity of 1,000 t, ten axles and 3 m width was built by Gottwald for Riga Mainz from 1983 to 1985 . It was the first mobile telescopic crane with a nominal load capacity of 1,000 t. Until 2007 the performance of this unique piece remained unmatched.

Originally the crane was only designed for a nominal maximum load of 800 t, but the load tests on the test field showed that the crane was far more powerful than planned. For this reason, the crane has been approved for loads of up to 1,000 t.

The telescopic mast is transported separately on a special nine-axle mast transporter "AMK 1000-93 TR". This has a special bracket for the mast that allows it to be positioned appropriately for the bolt, even if the ground is slightly uneven.

In 1994 the crane was sold to Breuer . After the company was dissolved, the crane was sold to Long Hook in Taiwan in 2000 . After it had been for sale there for some time in an extremely desolate condition (for 2 million US dollars), it was bought by Chisun Cranes (Singapore) in 2004 and completely overhauled. The crane has been in use again since mid-2005.

Liebherr LTM 1500-8.1

The eight-axle Liebherr LTM 1500-8.1 mobile crane is equipped with a four-part 50 m long or a seven-part 84 m long telescopic boom and thus has one of the world's longest telescopic booms. An additional mast transporter is not required because the telescopic mast is permanently mounted.

Largest crawler cranes in the world

Manufacturers of the world's largest crawler cranes in terms of load capacity are Tadano Demag , formerly Terex-Demag, and Liebherr .

The most popular crawler crane with a load capacity of more than 1,000 t is the Terex-Demag CC 8800 with a load capacity of 1,250 t and a maximum load moment of 22,000 mt. The successor model CC 8800-1 has a load capacity of 1,600 t and a maximum load moment of over 24,000 mt. For the first time in 2007 a CC 8800-1 was expanded to a CC 8800-1 Twin with a load capacity of 3,200 t and a load moment of 44,000 mt with additional components. Two systems, whose masts are connected several times by cross struts, are mounted on a base plate. No component is wider than 3.5 m and the transport weights of almost all components are less than 40 t. The length of the main boom is 117 m. With a luffing jib, the maximum hook height is 235 m.

The Liebherr LR 13000 is the largest conventional crawler crane with 3,000 t and a radius of 12 m. With a maximum of 120 m main mast and 126 m luffing jib, the maximum hook height is 240 m. Due to a higher turntable load and the newly developed slewing ring, which can transmit a high torque, the crane can be operated in the partial load range without derrick ballast, a uniqueness of this magnitude. The P-boom (PowerBoom) system newly developed by Liebherr can also be used for the LR 13000, where the lower part of the main boom is doubled by side-by-side partial masts, which compensates for torsional forces and allows a higher load capacity with large mast lengths. The assembled hook block alone weighs 111 t and is 9.7 m high, the centerpiece of which weighs 31.6 t. The 82 t heavy chains are also removed for transport and the 128 t chain carriers are split in half for weight reasons. Disassembled, all parts have a maximum weight of 70 t and a width of 4 m. The 4.5 m wide turntable is transported diagonally. This has reached a limit for this crane format. The first piece was bought by Mammoet in May 2012 and set up for the first productive use in the BP refinery in Whiting (Indiana) from the end of July 2012 , where a major modernization project is being carried out.

Also from Terex Cranes Germany is the third most powerful crawler crane, the CC 12600 , with a load capacity of 1,600 t. A crawler crane from Liebherr is the LR 11350 with a load capacity of 1,350 t and a hook height of 223 m.

See also

literature

  • Horst König: Machines in construction: Basics and application . Springer Verlag, 2014, ISBN 978-3-658-03289-0 .

Web links

Commons : Mobile crane  - collection of pictures, videos and audio files

Individual evidence

  1. Liebherr press release LG1750. (PDF) (No longer available online.) Archived from the original on August 1, 2014 ; accessed on January 6, 2015 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.bracht-autokrane.de
  2. LG 1750. Retrieved January 6, 2015 .
  3. ABC Crane Co , specializing in the rental of GCI Tower Cranes
  4. Hansebubeforum >> Cranes and heavy loads historically >> Grove GCI 4200/5400/7500
  5. liebherr.com
  6. hadel.net
  7. Mammoet orders Liebherr LR 13000 crawler crane , liebherr.com, May 3, 2012.
  8. Bowdeya Tweh: Heavy crane shipment heading to BP Whiting Refinery , nwi.com, July 30, 2012 found.