Tower cranes
 

I know that we have at least one member knowledgeable about cranes, so my question is about tower cranes.
When a tower crane is installed on a construction site, do they sink a foundation? If so, how is it fastened to the structure?
Are modern tower cranes operated remotely from the ground? Are they electric?
Attached is a photo of one with little obvious visible support (IMO).

Some use ballast blocks to secure the base

http://www.londontowercranes.co.uk/d...OWER_CRANE.pdf


Crane info

http://www.towercranetraining.co.uk/towercranetypes.htm

A forum for crane enthusiasts:- http://forum.skyscraperpage.com/showthread.php?t=147213

One of the largest crawler cranes in Asia, a 1,600t lift capacity Terex Demag CC 8800-1, is being used to erect a gigantic polythene reactor at Dagang, China.

http://www.contractjournal.com/Artic...on-photos.html

A Derbyshire home is back on the market seven months after a 26-tonne mobile crane smashed into it.

http://news.bbc.co.uk/1/hi/england/d...re/7962494.stm

What is reputed to be Europe's largest mobile crane has come to Scotland.
The components of the 1,200 tonne crane were transported to Scotland in 45 lorries.

http://news.bbc.co.uk/1/hi/scotland/...st/8176114.stm

At least that brings the hourly rate down . . .

Mammoet has announced plans to introduce two new super heavy lift cranes in the third quarter of 2011, designed for the heaviest lift applications.

http://www.cranestodaymagazine.com/s...rycode=2053779