2.- Also, luffing-jib cranes can improve material handling cycles in the jobsite, using them like auxiliry cranes to the pricinpal tower cranes, reducing the construction time. 3.- Normally, the maximun load bigger than a tower craneâs. 4.- In some places, local laws make luffing-jib cranes necessary. For instance,
Updated July 22, 2016. Observed on the first Monday in September, Labor Day is the day to âthrow down your tools,â and eat too many hotdogs while thanking American workers for their collective contribution to the strength, prosperity, quality of life, cold beer, and great sales enjoyed across the nation.
Meaning, history and more. Millions of Americans will be celebrating Labor Day on Sept. 5, a day that marks the unofficial end of summer. It's celebrated with parades, parties and - of course - barbecues. But why do we celebrate Labor Day and what is its history? Here's some information from the U.S. Department of Labor.