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.
For many of us (but far from all of us), itâs a welcome day off of work or school, ahead of what is likely to be a busier month than the last. But the Labor Day holiday has a storied past, one of violence and celebration, thatâs embedded deep in the history of the American labor movement. And while it has spread around the world in different forms, Labor Day has distinctly American roots. Hereâs a quick primer on the meaning and history of the holiday.