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Innovation with the same look
A case for the patent office
We're not reinventing the wheel. But we're rethinking everything else carefully. This is how we are preparing for the future. Our engineers have redesigned the basic structural steel construction, tailored it to current requirements and integrated the digital features of innovative Liebherr technologies. The result is a powerful, highly flexible mobile crane which delivers an excellent hoist height and range. The LTM 1230-5.1 sets the new benchmark in the 5-axle class.
“We developed and used new ideas for the structural steelwork of the LTM 1230-5.1”, says Joachim Henkel and continues: “The front outriggers are single-stage, the rear ones are double-stage – unlike anything that has gone before.” He has been with the Design and Development Department in Ehingen for 28 years and has worked on the design of more than 40 crane models. He has been manager of the Statics Department since 2011. His team carries out complex calculations to improve the steel structure of Liebherr cranes.
Single and double-stage outriggers have been combined on a crane for the first time.
The support base overall is smaller than on the predecessor model LTM 1200-5.1 despite the new crane’s significantly higher lifting capacity and a longer boom. “This brings the crane closer to the load”. Henkel explains the concept on which a patent is pending: “We have designed the support base to have a trapezoidal shape. At the rear the maximum support width to the side is 8.1 metres and to the front 7.4 metres. With a working range of 360 degrees, this means that we have almost no reductions in lifting capacity compared to a rectangular support base with a support width of 8.1 metres to the front and rear.”
The single-stage outriggers at the front are lighter. This weight reduction can be used to extend the boom length. Furthermore, the single-stage outriggers feature greater rigidity. The extended rear supports, together with Liebherr’s VarioBase® deliver particularly high lifting capacities. We call the combination of the trapezoidal and variable support base “VarioBase Plus”.
Parallelogram-shaped support base
Trapezoidal support base
Single telescoping outrigger
Double telescoping outrigger
Centre of rotation superstructure
Special effect – VarioBase®
VarioBase® makes the trapezoidal support base even more efficient. The multi-award-winning technology calculates the maximum lifting capacities in real time – based on the current support situation. The LTM 1230-5.1 delivers particularly high lifting capacities for hoists over the rear and the wide support base at the rear with part ballast, which are performed very frequently in practice. This can make a second ballast transport superfluous!
In summary: a real power pack
Finally, VarioBallast® completes the enormous increase in lifting capacity and flexibility – the radius of the 72-tonne ballast can be adjusted from 4.8 metres to 5.7 metres. Want a comparison? With the same ballast height compared to the predecessor model, the LTM 1200-5.1, the new 5-axle crane can on average hoist over 20 % more. That’s a significant increase!
Green and powerful
The drive technology is ready to tackle the challenges of the future – the Liebherr diesel engine develops 400 kW whilst complying with stage V, including a particulate filter, to provide all the power you need. It transfers the power using the innovative ZF-TraXon gearbox, including ECOdrive, comfortable driving, noise reduction and the hill start aid. In addition, the time-tested single-engine concept with ECOmode from Liebherr reduces both fuel consumption and noise level.
Why does Liebherr have two powerful 5-axle cranes in its range?
For over 20 years, Karl Stöhr has been jointly responsible for Liebherr’s successful mobile crane concepts in the role of Head of Product Management.
“We have two powerful, modern 5-axle cranes, the LTM 1230-5.1 and the LTM 1250-5.1. As the names suggest, they are relatively similar mobile cranes with a maximum lifting capacity difference of just 20 tonnes, 230 tonnes versus 250 tonnes. So we are quite justified in asking – why do we have both of them in our range and what are the differences between them?
The LTM 1250-5.1 is the most powerful 5-axle crane on the market. It is designed for maximum performance. If it cannot manage a job, no other 5-axle crane will manage it. In that case a 6-axle crane will have to be used – with the road licensing problems which that brings. The Liebherr 250-tonne crane was designed to be a heavy load crane and can be fitted with a maximum ballast of 88 tonnes.
The booms: The LTM 1250-5.1 has a 60 metre telescopic boom length versus an enormous 75 metres on the LTM 1230-5.1. The 230-tonne crane is designed for working at great heights. The new LTM 1230-5.1 is perfect for jobs involving wind turbines, tower crane erection and in industry. Its real strength is working with the boom fully raised and at great hook heights.
It is worth noting that this is actually the continuation of a successful concept – there are around one thousand each of its two predecessors, the LTM 1220-5.2 and LTM 1200-5.1, around the world and showing their strengths on a daily basis. One of them is designed for maximum lifting capacity whilst the other has a long telescopic boom.
Since the highest demand on the market is currently in the 5-axle class, our new powerful 5-axle mobile cranes by no means signals the end of our development offensive. We will once again be unveiling a new model in the 5-axle range at Bauma 2019, which is something to look forward to.”