42
IN ACTION
NOVEMBER-DECEMBER2014
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Crane on crane
Crane service provider Fricke-Schmidbauer
Schwerlast used a Terex CC2400-1 lattice
boom crawler crane to helpmove two
overhead cranes at a steel mill in the town
of Salzgitter, Germany. Themill is owned by
German steel producer Salzgitter Flachstahl.
The task for the crawler included lifting down
two 400 tonne capacity dismantled ladle
handling overhead cranes from a height of
38m (125 ft). The components weighed up
to 105 tonnes each.
The working area for the 400 tonne
capacity crawler was 15 x 22m (50 x 72
ft), making the lifts a challenge. Tomake
them possible, a train shed and several bumper blocks had to be removed first, a company
spokesperson said. The space then had to be levelled out.
The crawler was delivered to the site by 20 trucks. It was then assembled with the help
of a Terex AC100 all terrain crane. To carry out the work the CC2400-1was set up in
SWSL configuration with a 36m (118 ft) boom and a 36m fly jib. In addition, the crane
was fitted with 160 tonnes of Superlift counterweight and 160 tonnes of ballast on the
basic unit.
Once assembled, the crawler lifted the smaller sections of the overhead crane through a
9 x 9m (30 x 30 ft) opening in themill’s roof. For the larger components the crawler lifted
them onto themill floor where they could be dismantled further and loaded onto trucks.
The overhead cranes were dismantled in 30 lifts over 15 days.
Avant robot meets
library requirements
T
heNational Libraryof Finland, located
at the centreofHelsinki, isundergoing
an extensive renovation,which is
the largest repair that the structurehas
experienced in its 169-yearhistory. Theproject
has recentlybeenvoted for the construction
siteof the year inFinland.
The renovation started lastNovember and
will last for a total of twoyears. In addition
to a thorough interior conservation, the
basement level is being expanded to allow
for additional rooms aswell as space for
heating, ventilation, air conditioning and
other building services. Thebasement stands
on topof the granitebedrock, 500m³ (17,660
ft
3
) ofwhichhas tobe removed aspart of the
renovation and expansionwork.
Theprestigious library setshigh
requirements for the contractors aswell
as the equipment used. “Whenworking in
ahistorical building such as this, the job
has tobedonewithout generatingdust,
water, vibration and exhaust emissions”,
said JyrkiMetso fromMetsonMurskaus
Oy, the specialist contractor carryingout
thework. The space is so restricted that the
first bouldershad tobe excavatedwith a
sledgehammer and ahanddrill.Now the
majorityof excavation is being carriedout by
anAvantRobot 185 equippedwith aDoofor
rockdrill and ahydraulic splitter.
Less than80 cm (32 inch)wide, the remote
controlledAvantRobot canbedriven through
thenarrow corridors of the cellar. The robot
drills 1mdeep (3.3 ft) and45mm (1.8 inch)
diameterholes,which are then excavatedby
thehydraulic splitter. “Becauseof the limited
space, thebouldershave tobemanually
removed. So there areplentyof holes tobe
drilled”, said Jyrki.
TheAvantRobot 185 is equippedwith
a telescopicboom and continuous slewing,
which are essential features forproductivity.
The electricallypoweredmachine allowswork
Amann is using its dsb Innocrush
35 to process demolitionwaste
for recycling purposes
tobe carriedout in confined cellarswithout
the generationof exhaust gases.Without the
185, the jobwould require a large amount of
manualwork andwouldnot be cost-effective.
“In suchdifficult conditions and the tight
schedule, themachines and servicehave
to reallywork.Wehavebeenpleasedwith
the reliability and features of our robot and
drilling. The robot has proven itselfwith
500hours on it, and service and spareparts
havebeen rapid ifwe everneeded anything”,
Jryki commented. “With thesework tools
andmethodswehavebeen able tomeet the
challenges of theproject and toproceed
according to schedule”, he ended.
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