Posted by Paul in MN on July 01, 2010 at 20:54:06 from (71.210.144.174):
In Reply to: Pole barn repair posted by Dan-IA on June 30, 2010 at 19:45:59:
Dan,
You need to make good temporary supports while you work on the broken pole(s). Temp supports are often set at a bit of an angle, and that can spell disaster. Any angle loading of a hyd jack can cause it to spit out faster than you can get away from it. It is best to design the temp supports so they are truely vertical, and after having jacked them to the correct hieght, set some hard support because most hyd jacks will or can leak down. They are good for lifting, but are high risk for holding.
Have a substancial steel plate that the top of the jack pushes on. If the ram of the jack pushes against wood, it can crush or cause the wood beam to split. So spread out the lift forces with a steel pad plate. Use chains, cables, come alongs to stabilize the vertical supports. Safety is worth a few extra hours of bracing and chaining.
The specific design of what you need to do can not be explained here, there are just too many variables.
As to the safety stuff, I speak from experience. If the beam or post can bow, it will. If the jack can roll and fly out, it will. If bracing is insufficient, it will break. Be sure that everything is 2 to 3 times as strong as you guess it needs to be.
Even though a building looks to be very stationary, barns and especially pole barns are dynamic....they are in motion, usually slow motion. But the shifting winds and breezes are putting a lot of force on one side of the roof, while suction is created on the other side. This is putting sideways bending forces on the poles. Thus there is a lot more need for strong temp bracing.
Think FORCES as you do this work, and you can probably anticipate the bracing you will need.
A guy who repairs barns told me to never jack or pull too much at once, he figured about 1/2" of pull or push per day. Use a taut string line to determine "straight". The eye is not good enough, you will see mistakes later.
Best of Luck, and I hope to hear about your success on this forum.
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