Abstract: Provided is a reinforcement beam for horizontal frames, the reinforcement beam being configured to be used in a prefabricated shelf that is fabricated with vertical frames and horizontal frames, the horizontal frames including a connection portion fastened to the vertical frames at end portions of the connection portion, and an abutment portion which is formed by folding the connection portion such that the abutment portion is formed integrally with the connection portion and which supports a support plate. The reinforcement beam for the horizontal frames includes a body portion in which a pulling portion configured to support a lower outer surface of the connection portion is provided on each of opposite ends of the body portion. The reinforcement beam for the horizontal frames prevents the horizontal frames from collapsing under a large load.

Abstract: Provided is an angle bar for shelf assembly, the angle bar including a vertical frame in which a plurality of fastening grooves is formed and a horizontal frame on which a fastening protrusion is formed, wherein the plurality of fastening grooves, each including upper and lower grooves, are formed, the lower groove has a narrower width than the upper groove, and is connected to the upper groove with an inclination portion in between, wherein the fastening protrusion includes a convex portion having an inclination surface and first and second wing portions that are formed on lateral surfaces, respectively, of the convex portion, and wherein a distance between respective end portions of the first and second wing portions is smaller than a width of the upper groove and is larger than a width of the lower groove, and the convex portion has a wider width than the lower groove.

Abstract: Provided is a prefabricated shelf assembly. The prefabricated shelf assembly enables a shelf to be conveniently and rapidly assembled, enables the assembled shelf to be firmly maintained, and allows an outer wall and a door to be assembled as a user desires, thus realizing a high-quality product, and allows the length of the shelf to be adjusted via an assembly kit or allows a plurality of shelves to be optionally arranged and then be assembled depending on an installation environment, and adopts a coupling method using a fitting protrusion and a fitting hole, so that the shelf may be re-assembled by separating only a support plate even when the assembly has been completed, and thereby the height of a storage part can be easily changed.