kangaroo crane造句

例句与造句

Another innovation was the kangaroo crane.
Rather than slewing ( rotating ) the crane to reach the delivery hopper on-shore, a kangaroo crane has its own in-built hopper beneath the jib, that slews with it.
To build the towers, cranes were imported from Australia ( and therefore called kangaroo cranes ) equipped with hydraulic systems that enabled them to hoist themselves up the towers as they rose.
The term " kangaroo crane " has also been applied more recently to jumping cranes, tower cranes used in the construction of skyscrapers that are capable of raising their towers as construction grows upwards.
On the Australian-built cranes designed specially for the job _ called kangaroo cranes in part because they jacked themselves up as the towers rose _ booms crumpled, bolts anchoring the cranes to their supports blew out like musket shots and once, a 25-ton piece of steel plummeted 800 feet and tore through the basement like a meteor.