Tuesday, October 5, 2010
THE MIRACULOUS MAT JACK: IT LIFTS, SEPARATES, AND SUPPORTS (UP TO 70,000 LBS.)!!
Although this is the most extreme example, all of the 10 beams have moved upwards or downwards various distances. The problem is how to get the bases of all these beams at the same level, then installing larger and deeper footers for each, in order to provide stability for the new building.
First a baseline level is determined. The bases of all beams will be adjusted to that level. As we’ve seen in previous posts, a steel frame box is temporarily attached to the beam. Then the existing footer is excavated and removed. Now comes the cool part.
How can one adjust the height of a 50-foot tall steel I-beam that is part of the steel skeleton of a building? The Mat Jack is a thick rubberized pad that can be inflated with a compressor. The one used at dinosaur can be inflated up to 11 inches in thickness and lift a weight of up to 70 tons.
This process is repeated for each of the 10 I-beams on the south side of the building. This is a slow process, taking many weeks, but it is remarkable to watch the fine adjustments made with the Mat Jack as it lifts and supports the weight of the building. Victoria’s Secret must be green with envy.
Once completed, the building will be the most stable it has been since it was built in 1957. If it isn’t, well we can all blame this guy -----