INTERNATIONAL ANDSPECIALIZED TRANSPORT
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APRIL 2015
28
TOWER CRANES
saving, this arrangementmeans extra
erectionweight andneeds additional
accessplatforms.Wilbert is consideringa
sidemountedE-container inwhich there is
space left at the front to store theoperator
cabin for transport. In1987FavelleFavco
was apioneer ingivinga choiceofwhere to
place the sidemounted crane cabin togive
thebest viewand to reduce space climbing
the cranedownalongside abuilding.
Anchored close to the facadeof abuilding
an essential benefit canbe that the cabinbe
installed inside theA-frame, like theWolff
900B, for climbingdown, or at theopposite
sideof themachinerydeck.
Easeofmovement
To reduce thedeadweight and transport
volumeof the jibmanymanufacturers
prefer a triangular cross-section.Adequate
side loading capacity, however, especially
when long jib combinations are rigged,
must be respected.A square section jib can
be consideredwhenheavy lift capability is
required. Even forheavy
lift cranes, however, jib
sectionswider than3.30m
shouldbe avoidedbecause
of transport costs and
permits foroversized loads
arebecoming stricter.
Withworldwide rental
fleetmanagement in
mind,machinerydeck
components and slewing
units, inaddition to jib
and tower sections, should
bedesigned to fit standard
shipping containers
whereverpossible. This
alreadyhappenswith
most hammerhead cranes.At the same
time crane componentweights shouldbe
able tobe adapted to the capacityof roof
topdismantling cranes toavoid several
dismantling stepswithdifferent crane sizes.
With itsnew700 tonne-metre class
710HC-LLiebherrhas takenon thisdesign
challenge and reduced the component
weight to10 tonnes. The lightweight
Liebherr 200DR5/10derrick canbe
used fordismantling. Inaddition, all
componentsof the710HC-Larebuilt to
fit standard containers. Toachieve this
the slewing ring supportwasdesigned
tobe as small aspossible comparedwith
the standard formof thispart in the same
capacity class. To reduce erectionweight,
thehoistingwinch canbe separatedby
fourpins from thehoistingwinchplatform
which, in turn, is fixedbyanother four
pinson topof themachineryplatform
framework. Thiswinchmountingdesign
couldalsoperhaps allowdifferentwinch
types and sizes tobeplacedon topof
the samebasicmachineryplatformon
customer request.
Suchdesign flexibility couldalso lead
theway formodularisation in the luffing
jib crane line. It could extend from tower
sections tomachinerydeck components,
identical counterweight blocks and jib
modules sharedacross some capacity
classes, as is already typical in flat top
cranedesign.
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Ogawadevelopedand
patentedaway tokeep
the luffing rope in
pre-reeved conditionat
thebackof theA-frame
With just 6.80m tail radius in the
700 tonne-metre class, this JCL-720NK
represents the very typical compactmachinery
deckof all newKitagawa climbing cranes
While the jibof the
EverdigmEC580L-24
isheld inplaceby two
assistant ropes, the truck
cranehook is free for
connecting the luffing
winchpulley blockwith
the jibpendant line
Likemanymodern
Chinese tower cranes the
JCD6059 fromSCJC in the
500 tonne-metre classhas
anenlarged sidemounted
cabinwith integrated
electrical cabinet
Liebherr’s all
new710HC-L is a
modular designwith
components that
fit inside standard
containers. It canbe
dismantledusinga
10 tonnederrick
