48
ACT
FEBRUARY 2015
SITEREPORT
LIFTING& TRANSPORT
and rebar to structural steel, equipment
and concrete are liftedby the cranes.
Careful planning is requiredup front to
make certain that every square inchof the
project site is coveredbya tower crane for
construction crews.
“Wehaveup to700 feet underhook
height andup to244 feet hook reachwith
the tower cranes,”Hyden said.
Manyof the cranes fit in the300 to400
meter-tonmarket range, and each tower
cranedesignwas selected tomeet specific
criteria. Since this is adowntownproject,
space is at apremium.
Conserving space
“Weneed luffing jibs forwork close to
adjacent structures and tomeetweather-
vaning restrictions,”Fioravanti explained.
TheTerex luffing jib line includes eight
differentmodel configurationswith lift
capacity classes ranging from11 to72.5
tons andmaximum jib lengths from164
to246.1 feet. Offeringaworking rangeof
15 to85degrees, Terex luffing jib cranes
increase flexibilitybygiving the lifting
crewanumberof differentworking
radii,while conserving spaceon the job,
Fioravanti said.
With theCityCentreproject requiring so
many crane configurations, it’s inevitable
that interferencewouldbe a concern.
“There are asmanyas five interfering
cranesworking together in certainareasof
theproject,”Fioravanti said, “soweused
Terex flat top cranes for thispart of the
project.”
Flat top tower cranes are constructed
without the “tops”of conventional cranes
andoffer lift capacities reaching44.1 tons.
“Terex flat top cranes aredesigned
specifically for jobs likeCityCentrewhere
space is confinedorwhenworkingnear
airports,” saidRuediVanCoppenolle,
Terex salesmanager, tower cranes. “Maxim
isusing theTerexCTT561/A-20model on
thisparticularproject,whichgave thema
maximum jib lengthof 275.6 feet.
Where space isnot a concernand the
need for lifting speedandpowerwere
required,Maxim’s team selected the
hammerhead cranedesign. Providing
a jib length reachingup to262.5 feet,
hammerhead cranes aredesigned
specifically forheavy liftingandplacement
dutieson challenging jobsites.
“Our SK series includes craneswith
maximum lift capacities ranging from22
to35.3 tons,” saidVanCoppenolle.
Hyden said thehammerheadmodels
were selected for speedand capacity.
“Our customers andoperators alike
appreciate the speedand reliability,”he
said.
With theproject positionednear the
AtlanticOcean coastline and constructed
over a3.5-yearperiod,Americaribe/
Moriarty JVandMaximCranehad
toaccount for and establish safety
procedures in caseof hurricanesmaking
landfall. Terexprovidedapplication
engineeringassistance tohelpdevelop
climb sequences, tie-off points and initial
freestanding configurations suitable to this
job tomeet hurricanewind-load ratings.
Terex transfermastshelpMaximCrane
meet the stringentwind-load ratings
andgainmore flexibilitywith regard to
freestanding crane configurations. The
transfermast alsoallows crews tomore
efficientlyuse tower crane segments
between thedifferent towerdesigns.
“The transfermasts allowany tower
crane segment tobeusedwith the
hammerhead, flat topor luffing jib crane
design, regardlessofwhatmodel the
segmentwasbuilt for,” explainedVan
Coppenolle. “Crews canmix standard
upper segmentswithheavyduty
lower segments todeliver amaximum
freestanding craneheight of 140 feet,while
stillmeetingFlorida’s 146mphwind-load
standard.”
More than two-thirdsof theway through
CityCentre’s construction cycle,Maxim
Crane’s crewand11 tower cranes are
instrumental in efficientlyhelping to
construct the site’s structures.
■
Maxim is using the Terex CTT561/A-20 flat-
topmodel, which gave them amaximum jib
length of 275.6 feet.
The $1.05 billion Brickell City Centremixed-
use development includes a number of high-
rise buildings skirting theMiami River, just
off the coast.
Transfer masts allow any tower crane
segment to be usedwith the hammerhead,
flat top or luffing jib crane design,
regardless of what model the segment was
built for. Crews canmix standard upper
segmentswith heavy duty lower segments to
deliver amaximum freestanding crane height
of 140 feet.
