Monitoring and improvement of project solutions for the replacement of under-craned structures of the assembly shop in an industrial building

Abstract

Under-crane constructions serve for the movement of cranes and transfer the load from the lifting and transporting equipment to the frame of the building. The design term of operation of crane structures should be taken as equal to the period during which their full functionality is ensured.

The object of research is the assembly shop of an industrial building built in the early 60s of the last century. The building is one story, consisting of four longitudinal and one transverse span, and an open crane overpass located across the main spans. The overall dimensions of the assembly shop are 144×102 m, of which: four longitudinal spans of 18x120 m, and one transverse span of 24×102 m.

It was found that the under-crane beams of workshops work in difficult conditions: significant loads, intensive operation, aggressive environment, and elevated air temperatures.

The prerequisites for researching the technical condition of the crane structure after 50 years of operation of two overhead cranes with a load capacity of 20/5 t and 5 t at an industrial enterprise have been determined.

Monitoring of the technical condition of 32 ordinary and 8 extreme reinforced concrete structures of the crane beams of the assembly shop building in span "B-E" was carried out.

A horizontal survey of the column console was carried out and deviations were detected (using leveling). It was found that the columns of the building frame, on which the crane beams rest, deviate from the horizontal by up to 210 mm. During the inspection, the destruction of the concrete of the shelves of the crane beams with exposure and corrosion of the reinforcement was found. As a result of the examination, it was found that almost 100% of all bolted connections of the crane track are broken.

The necessity of improving design solutions for replacing worn-out reinforced concrete crane beams with steel crane beams has been proven.

It has been proven that crane beams play an important role in ensuring the safety and efficiency of work in the assembly shop. Replacing reinforced concrete beams with metal ones can be an important step to improve these parameters.