Why the purchase of a spreader is worth it

and why not:

»»» http://www.youtube.com/watch?v=HAq-uhXmEi8

this is how it should work:

»»» http://www.youtube.com/watch?v=9UTT_fqQpC0

Special mission on Europe's largest port construction site

...admittedly, this was some time ago, but it is still worth having a look at:

The dimensions are gigantic. In this huge project, 37000 tons of sheet piling steel are processed, 10000 tons of reinforcing steel are laid, 60000 cubic metres of concrete are processed and ten million cubic metres of sand are dredged. The construction of the sheet piling on the water side in the river Weser under full tidal influence is the most important and at the same time most complex stage of the entire project. Therefore, numerous cable dredgers from the Liebherr plant in Nenzing with special add-on units are used. In the years 2004 to 2008 bremenports constructed a further 1681 metres of riverside quay, Container-Terminal 4, out of the bare earth as it were. This gigantic project required a total of ten million cubic metres of sand to create a new working area for the terminal on a site of approx. 90 hectares, where four new berths were built for mega-container vessels.

»»» http://www.bremenports.de/1896_2

And it's doing nothing else all day

It lifts containers from A to B, is indispensable in ports and harbours and full of technology - it is a spreader ...



as an introduction:

The spreader is a device used for lifting containers and unitized cargo.

The spreader used for containers has a locking mechanism (called twist lock) at each corner that attaches the four corners of the container. A spreader can be used on a container crane, a straddle carrier and at any other machinery to lift containers.

»»» http://en.wikipedia.org/wiki/Spreader_%28container%29

What is a dragline excavator?

Dragline excavation systems are heavy equipment used in civil engineering and surface mining. In civil engineering the smaller types are used for road and port construction. The larger types are used in strip-mining operations to move overburden above coal, and for tar-sand mining. Draglines are amongst the largest mobile equipment (not water-borne), and weigh in the vicinity of 2000 metric tonnes, though specimens weighing up to 13,000 metric tonnes have also been constructed.

A dragline bucket system consists of a large bucket which is suspended from a boom (a large truss-like structure) with wire ropes. The bucket is manoeuvred by means of a number of ropes and chains. The hoist rope, powered by large diesel or electric motors, supports the bucket and hoist-coupler assembly from the boom. The dragrope is used to draw the bucket assembly horizontally. By skillful manoeuvre of the hoist and the dragropes the bucket is controlled for various operations.

»»» Source: wikipedia.org/wiki/Dragline_excavator