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.
Â­For a lot of people, Labor Day means two things: a day off and the end of summer. But why is it called Labor Day? Labor Day is a day set aside to pay tribute to working men and women. It has been celebrated as a national holiday in the United States and Canada since 1894. Â­Â­Labor unions themselves celebrated the first labor days in the United States, although there's some speculation as to exactly who came up with the idea.