Study on Deformation Analysis and Construction Process of Large-span Shaped Cable Network Canopy

The construction of large urban underground spaces has a large area and a long construction period, which may have a negative impact on the urban landscape and the environment during construction. In addition, due to the irregularity of the surface form of the underground space, it brings challenges to erecting a temporary covering system. For this reason, this paper proposes a new type of large-span anisotropic cable network canopy construction technology, taking the Canton Tower South Square project as an example, calculating and comparing different canopy support schemes through numerical calculations, and analyzing the key points of the new construction technology, and the following conclusions can be drawn: the vertical deformation of the canopy support structure is substantially reduced by 83.11% using the combination of steel cables and steel trusses proposed in this paper compared with only the steel cable network scheme. Compared with the steel roof, the steel cable network with steel trusses can significantly reduce the steel consumption by 96% when the same maximum vertical displacement is achieved. Mesh cloth as a canopy not only has many advantages such as dustproof, high temperature resistance, rainwater washout, environmental protection, etc., but also can minimize the negative impact of building construction on the life of the surrounding residents and the environment, and has a wide range of prospects for application in large-scale underground space construction projects within the city.