"Vass" wrote in message
...

"John" wrote in message
...
I live in Leeds where there is lots of redevelopment going on in the city
centre. I was driving through the other day and got wondering "How do
they build them and get the crane cab and boom up there?" Do they use
another crane? If so how did they build that one, did they use another
crane? If so....... Do we have a chicken and egg situation here? I have
never seen one of these things erected, they just seem to appear
overnight. Is it the crane fairies job to put them there?


It builds itself, pulling up a section and slotting it in beneath, pushing
itself upwards
clever stuff, google for it I'm sure theres something out there about it.
--
Vass


#1: One of the Sat-Cable Channels shows these being self-erected
frequently - 'Amazing/Big/Monster Machines/Engineering ' or
some such. One programme actually showed a _building_ in
Sweden which was a 'jack-it-up' construction; central core
with stair-case- service ducts etc; lay floor 'segments'; place
re-bar pump concrete; when set - remove petals, add next storey's
inner core moulds, pour concrete; when set - remove moulds;
add next floor petals ... repeat ... repeat.

#2: spoke to an industrial electrician (not Part P) and he said
he _looks_ for cityscape with lots of tower cranes; - there's
jobbing opportunities for carpenters, electricians, plumbers
at the base of each of them.

--

Brian