Steel tube concrete diagonal frame column spatial tubular joint and its manufacture method

The invention provides an oblique grid column spatial joint for a concrete-filled steel tube and a manufacture method thereof, wherein, four round steel tubes of the joint are crossed at the position of an oval connecting plate, and welding connections are adopted among the four round steel tubes and between the round steel tubes and the oval connecting plate; a circumferential reinforcing plate consists of at least two annular steel plates, is welded on the four round steel tubes on the welded joint of a central plane; two annular plates parallel to the circumferential reinforcing plate are respectively welded on round steel tubes above and under the circumferential reinforcing plate; stiffener plates are welded between the circumferential reinforcing plate and the annular plates in uniform distribution; and joint extending brackets are welded on the annular plates. The manufacture method of the joint comprises the welding among the round steel tubes and the connecting plate, and the welding of the circumferential reinforcing plate, the annular plates and the stiffener plates. The joint has the advantages of clear force transfer, high bearing capacity, light weight, good performance and convenient construction, can effectively connect an upper oblique grid column and a lower oblique grid column so as to realize the spatial intersection of the joint of the concrete-filled steel tube column, and have excellent engineering application foreground.