CRAWLER CRANES Ӏ BRIDGE WORK
and rebars for which the crane is used. It gives the operator a total viewing height of up to 5.40 m; so they always have an optimum view of the working area and can lean back easily in the seat at a maximum angle of 30° – an ergonomically ideal posture for permanently concentrated work with maximum precision. Additional headlights on the basic boom and on the upper carriage, roof windows made of bulletproof glass,
and a programmable work area limitation that monitors the angle of rotation and boom radius also ensure maximum safety on the site. Artes has several Sennebogen cranes
with elevating cab in its fleet and values the elevating cab. Since it is involved with a loty of hydraulic engineering, it often works along waterways. "We specifically equip our telescopic cranes with the elevating cab because it increases productivity and
safety," says Artes technical superintendent at, Wouter Van De Putte. "The crane operator can see when something needs to be lowered to a deeper point, for example when building a quay wall, and can then react directly instead of using walkie- talkies or hand signals. But also on other construction sites in civil engineering, such as these bridges, the overview is much better for the crane driver, so they can work faster and safer."
TANDEM LIFT IN BRIDGE REPLACEMENT
As part of a complex infrastructure project two Liebherr LR 11000 crawler cranes performed a spectacular tandem-lift bridge replacement project in northern Germany. An old concrete pipe bridge over the A42 autobahn needed to be replaced with a modern steel construction. The bridge connects refineries in the region with the Bottrop tank farm, crossing both the A42 and the River Emscher.
A total of seven Liebherr cranes were used on this complex project. WASEL deployed the two 1,000-tonne crawler cranes for the bridge lifting operation; a 100-tonne mobile crane, an LTR 1220, an LTM 1230-5.1, an LTM 1250-5.1 and a 450-tonne crane were also used for auxiliary and assembly work. In the first phase of the project two
new bridge segments, each weighing 220 tonnes and measuring 71 metres in
length, 7 metres in width and 6 metres in height, were delivered by ship along the Rhine-Herne Canal. The two LR 11000 cranes then lifted the segments in precisely coordinated tandem lifts off the ship and placed them on a prepared pre-assembly area. The particular challenge with the first segment was to guide it between the two crawler cranes with centimetre precision in order to place it in the intended
38 CRANES TODAY
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