An apparatus applying camber to an I beam, a method applying camber to the I beam using the same, and a method compensating camber of the I beam applied beyond designed camber are provided to introduce the camber regardless of the I beam quality by introducing the camber with uniform pressure. An apparatus applying camber to an I beam comprises a beam applied guide part having upper and lower horizontal rolls(11a,11b) guiding the horizontally divided I beam web to pass through the upper and lower auxiliary rolls of the camber applied part; a camber applied part containing a fork-type compressing rod, a pressure unit, and a power supporting roll; and a beam carrying out guide part for guiding the I beam to keep horizontality and prevent the camber applied I beam part from being distorted. The upper and lower horizontal rolls are screw-fitted at screw rods(12a,12b) having upper and lower screws.
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