Patent ID: 8434279

Claim:
A method of manufacturing a composite beam using T-shaped steel, the method comprising: cutting a web of I-shaped steel in a longitudinal direction to prepare a plurality of T-shaped steels having upper and lower flanges in such a manner that a cutting line extends from a middle portion of the web at each of opposite ends of the I-shaped steel in an inward direction, runs in an upward inward direction, runs from an upper portion of the web below an upper flange of the I-shaped steel in a horizontal direction, runs toward a lower portion of the web in a downward inward direction, and runs from the lower portion of the web above the lower flange of the I-shaped steel in a horizontal direction to be continuously formed in a toothed shape, wherein one of opposite ends of each of the T-shaped steels having the upper and lower flanges is cut to a predetermined length from its end face in an inward direction, and first teeth protruding upwards from the cut ends of the upper and lower flanges of the T-shaped steels are cut to a depth of the web of the T-shaped steel so that the T-shaped steels having the upper and lower flanges have the same shape; integrating inverse T-shaped steel into lower surfaces of the webs at each of the opposite ends of each T-shaped steel to form I-shaped cross sections at each of the opposite ends of each T-shaped steel, and fixing vertical stiffeners to opposite sides of the web of the I-shaped cross section; and casting casing concrete along the web between the opposite vertical stiffeners of each T-shaped steel so that the opposite ends of each T-shaped steel are exposed as a steel on outer sides of the opposite vertical stiffeners.