A beam assembly fixed to a pole in order to display the items, and are assembled to facilitate the mounting shelves to the base plate on the upper side of the fixed beam, discloses a modular structure for assembling shelves extend the pole in the lateral direction of the pole.; Conventionally, assembling the fixed beams in the four poles, and when mounted the base plate on the upper side and side there are that it is very complicated structure to assemble the other pole problems in the direction to solve this problem, a plurality of engaging holes in the vertical direction ( a 21) bent at the top to support a support plate 40 which is secured to the formed post 20, the locking ring 31 is bent to one side to be inserted into the retaining hole 21 of the post 20 and the upper supporting unit connecting beams 50 to 33 are coupled to the side of the fixed beam 30, and the post 20 has, is another post 20 by a fixed beam 30 is coupled to both the front end so that the assembly a, containing the connecting beam (50), one side both sides with engaging holes 21 engaging ring 51 formed to be inserted into the post 20 at the distal end, a fixed beam (30) is bent at both the front end and a retaining ring 31 is inserted into the retaining hole 54, that is, the direction opposite to each other at the top Are formed by bending the base plate 40 is assembled shelf structure comprising first and second receiving portions (56, 57) for supporting so that the seating is provided.; Thus the assembling of fixed beams to a plurality of columns connected to each other, and the fixed beam assembly of the shelves is complete and that of mounting the base plate on the upper side of the engaging hole formed in the pillar is formed with vertically symmetric top and bottom distinction pillar during assembly it is not necessary to assemble, and the operation is very convenient and easy, with a connection beam and fixed beams on the pole side of the assembled shelves since this other pole to assemble and facilitates scaling of the shelves and convenient assembly, the base plate of the product it is prevented from dropping the display by the fall preventing plate assembly on the edge.
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