Research on Key Problems in the Construction Process of a Single-layer Aluminum Alloy Lattice Shell Structure

[Purposes] To solve the key problems in the field construction of the first single-layer aluminum alloy lattice shell structure in Shanxi Province, the interaction analyses between the 12.9 m cantilever canopy structure at the lower part and the 58.3 m diameter single-layer aluminum alloy lattice shell structure at the upper part are carried out. [Methods] According to the conditions of the construction site, FE model of construction process was established and the comparative analysis of four kinds of jacking point layout scheme were carried out. [Findings] The layout scheme of “only 12 jacking points in a single circle” is determined. When the diameter of the horizontal projection circle of the jacking point is 0.6 times the diameter of the horizontal projection circle of the reticulated shell, the jacking scheme is the best. Through the simulation analysis of synchronous jacking, the jacking support is selected and the temporary construction measures of jacking points are given. The initial tightening torque of stainless-steel bolts is determined to be 27 N·m by calculation, and the temporary measures for the lattice shell notch during the first jacking are given. Through the analyses of the “suspended” latticed shell, the installation sequence and relevant temporary measures of the members before and after the completion of the latticed shell are obtained. According to the meteorological data in recent 9 years and the construction months of the latticed shell, 11.3 ℃ is selected as the theoretical “closure” temperature of the latticed shell structure, and the influences of temperature rise and drop on the internal force and deformation of the latticed shell are analyzed. The research results of this paper can provide reference for the construction scheme of aluminum alloy shell.