FIELD: construction.
SUBSTANCE: invention relates to under-crane structures and can be used for operation of overhead cranes. To form the rail unit from a pair of rails on the production line the three-headed arched top rail is manufactured with the head in the arch key and with two heads below on the toe edges and the lower arch rail, with the head facing down. On the production line the toes of upper and lower rails are automatically fitted with longitudinal rows of aligned mutually coincident regularly spaced holes. In flange of bearing channels the longitudinal rows of coaxially coinciding holes with the same regular step are formed. The top and bottom rails are aligned using four latching teeth. The coaxial holes are inserted with screw high yield friction studs and a single integrated closed rail unit with oval cavity inside the cross-section is formed.
EFFECT: invention allows to increase the moments of inertia of the rail in torsion and the modulus of resistance.
1 dwg
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