COMPOSITE BEAM FOR WOODEN CONSTRUCTION

PROBLEM TO BE SOLVED: To provide a composite beam for wooden construction, which is a main member in a conventional framework construction method of a wooden house and is bonded to a metallic material inserted to a column.SOLUTION: A light channel steel for a beam material is formed by bending a strip-shaped steel plate into a light channel steel shape in the longitudinal direction, provided with a plurality of bolt holes 4 on webs at both longitudinal end parts, and provided with a plurality of projection parts on the web backside other than the vicinity of the bolt holes of the web. In the substantive light channel steel, a groove 3a for which a projected surface is curved to the inner side is formed near the center of lips 3 extending outwards from the distal ends of upper and lower flanges 2 of the light channel steel, and nail holes 7 are provided at prescribed intervals on a part near the lip end part. A pair of the substantive light channel steel webs are piled up with each other, the projection parts of the webs are integrated with each other by connection of caulking 5, a cross section is formed into a roughly H shape, a wooden material 6 is inserted between the lips 3 extending from the upper and lower flanges, and the wooden material 6 is fixed with nails 8 from the nail holes 7 provided on the lips.