Steel in the News
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Posted by Jennifer Jernigan on August 13, 2010 at 10:56 AM.
A view of the side yard from inside Hirschfeld Industries’ plate girder shop in San Angelo, Texas.
A lot of steel has to be moved in and around fabrication shops, and often it’s done with a gantry-type crane that straddles the load. Mi-Jack Travelift rubber tire gantry cranes like this are a common sight in steel fabrication facilities. They have been around for years – the company started in 1954 – and are available with lifting capacities anywhere from 36,000 lb to 300,000 lb.
The spreader beam hanging from the two hooks on the underside of the Mi-Jack has anywhere from six to eight chains attached to it. The chains hang down in big loops that are used to carry long flimsy pieces of material, such as pieces of plate that are used for fabricating plate girders. At that stage it’s sort of like picking up a noodle — if you just pick it up in the middle, it will drag on the ground, but if you have multiple chains wrapped around it at various points, it will stay flat and ride into the shop well.