POLYGONAL ARCH Russian patent published in 2021 - IPC E04B1/32 

FIELD: construction.

SUBSTANCE: polygonal arch includes elements made of steel profiles, connected to each other at their ends by a central bolt and finally fixed by mounting bolts located on a circle around the central bolt. The polygonal arch is made of a set of the elements of two types that are sequentially connected to each other. The first type is made of a rolled I-beam, and the second type is made of two cold-bent channel bars. The cross-section height h_ch.b. is equal to the height of the I-beam wall h_wall. The axis of the central bolt is located at the ends of the elements in the middle of their cross-section, around which their wall is cut off along the semicircle from the radius R=h_wall/2 of both the I-beam and the channel bars, and at the end of the semicircle of the I-beam, shelves are cut off. The shelves of the channel bars are bent and welded to the semicircle of the wall.

EFFECT: eliminating the gussets that connect the elements of the same type, and reducing in the node of their connection to a single central bolt, around which the mounting bolts are located on a circle.

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