Raise existing columns 8 inches
Raise existing columns 8 inches
(OP)
Anyone ever had to raise existing columns 8"? One story retail with cmu walls on three sides and structural steel frames in the front. There are two or three lines of interior columns (steel). Roof structure is bar joists and joist girders. Structural steel and masonry are installed. Contractor realized that the roof joists are sloping too much and finds out that some of the interior columns are too short by 8 inches. Wanted to know if we could lift columns with a crane and add 8 inches of shim plates, extend anchor rods, and re-grout base plates. Anyone know of a better way.






RE: Raise existing columns 8 inches
A. Provide 8" tall Reinforced concrete pedestals at the base of the columns.
B. Shore the existing framing, cut the steel columns and full pen a 8" extension.
C. Install a shim along the girders. Such as a continuous tube, split tee section or other
I cannot tell from your question but I assume no finishes are in place that would be damaged during the lifting.
If you are required to design a lifting method. Remember to account for all of the addtional stiffness for the connections. The force required will be much higher then the calculated minimum dead load.
RE: Raise existing columns 8 inches
RE: Raise existing columns 8 inches
RE: Raise existing columns 8 inches
Thanks again for the replies.