RESEARCH ON STRENGTHENING DESIGN FOR JACKING OF A LONG-SPAN STEEL PLANT

A long-span steel plant was adopted a steel frame structure system. Under the construction, the deflection of steel beams on the first floor exceeded the limit of Standard for Classification of Steel Structures(GB 50017—2017). In order to meet the requirements of construction and subsequent use, it was necessary to strengthen the steel beams on the first floor of the structure. Through the calculation of the jacked steel beams and the monitoring of the on-site jacking process before and after reinforcement, the comparison and analysis of the structural stress and deformation before and after reinforcement showed that the excessive deformation of the steel beams was due to many reasons such as design and construction. The designed jacking devices could well realize the jacking of steel beams, and the reinforcement scheme for the jaking of steel beams was reasonable. After the steel beams were strengthened and jacked, the traffic demand of the existing crane beam was met, the structure became safe and reliable, which proved that the reinforcement scheme for lifting was safe and economical.