Most modern shipyards use heavy wheeled transport units to move ship blocks around the yard, when the blocks are built or stored on site - see the link, below, and in the construction dock. Single units may carry arround 1,000 tons, and they can be multipled to carry anything up to 15,000 tons. The transporters lift the blocks off their construction stands to move, and lower back onto stands when they are in position. DSME use Kamag units, but there are several brands making similar systems, and quite a number of available formats.
Unless they arrive by sea, when they can be floated in, individual blocks are lifted in over the dock gate by the floating crane, in the heaviest possible configuration.
The second set of links lead to videos showing machinery for moving whole ships in a ship repair or building dockyard - this could save yards building several construction docks, as a ship could be completely assembled ashore, then moved and launched in a few days - as the Maersk videos show, theres a lot of pressure on building docks at times.
Kamag Shipyard Transporters (SHTs):
http://www.kamag.de/en/products/new-vehicles/shipyard-industry-offshore/shipyard-transporter.htmlThis video shows a smallish SHT in use:
http://youtu.be/qo7blcKluPgThere are also newer systems in plan and contruction for shuffling ships about:
http://youtu.be/sSqNgoQkgGEhttp://youtu.be/yl9fMRRzgWA