Silent power: Kunze works its electric Liebherr

By Alex Dahm22 June 2020

The yellow MK 88 Plus mobile folding tower crane set up in a narrow Dresden street leaves enough space beside it for pedestrians and cyclists

The Liebherr MK 88 Plus mobile folding tower crane set up in a narrow Dresden street leaves enough space beside it for pedestrians and cyclists

Mains site power allowed the crane to work almost silently in Dresden’s historic old town and without engine exhaust emissions

Working in a city will increasingly require cranes to operate more quietly. Using electricity to power the crane is one way to do this. Where a crane can be powered from rechargeable batteries or connected to the mains, it will run relatively silently. In addition to being quieter than running a diesel engine, there is no air pollution at the point of use.

German crane rental company Krandienst Kunze recently proved the point on a shopping centre roof project in Dresden. It used a Liebherr MK 88 Plus mobile folding tower crane with electric drive to replace glass roof panels. The Radeberg-based company went to work in Dresden’s old town district near the Frauenkirche church. Challenges included narrow streets, awkward lifts out of the atrium over a 30 metre-high row of buildings and high-occupancy residential buildings surrounding the site.

Operator Christian Jahn used radio remote control and more than 50 lifts were made on the first day

Operator Christian Jahn used radio remote control and more than 50 lifts were made on the first day

While the crane was driven to site and set up on outriggers using its diesel engine, when it was level, the engine was stopped and the crane switched over to electrical power. Christian Jahn, crane operator, said, “I’ll do everything else using site power, including the MK’s assembly.”

Quiet operation meant the city allowed an extra hour of working both in the morning and the evening, helping to relieve pressure on the installation schedule.

The glass panels weighed up to 800 kg each and were attached to the crane using a vacuum lifting device.

A video of the project is here: https://youtu.be/nRd-E0sL5Xk

With the jib luffed at 30 degrees, the crane lifts the glass panels from the inner courtyard over the 30-metre-high row of buildings. At a radius of just under 39 metres capacity is 2 tonnes

With the jib luffed at 30 degrees, the crane lifts the glass panels from the inner courtyard over the 30-metre-high row of buildings. At a radius of just under 39 metres capacity is 2 tonnes

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