Abstract
In this paper, we explore the installation method and process of large-span air corridor curtain wall of Chongqing Raffles Square Project. The curtain wall is positioned at the lower part of the sightseeing overpass, with the spans of 48.5m, 52.6m and 54.1m respectively, and the lengths of the cantilever sections are 25.1m and 26.8m. At the junction of two rivers in Chongqing, several super high-rise buildings nearby exert strong aerodynamic interference effects. It is difficult to construct this project in a conventional way because intense airflow exists. Through an analysis of two construction options, with consideration to difficulties, quality, safety and economic costs of construction by the two options, the overall lifting of aluminum plate unit is chosen as the final plan. An introduction is made to practical operations of this option, including assembly of aluminum plate unit V-frame, tire frame installation, aluminum plate surface layer assembly, hydraulic synchronous lifting and unit body fixing. The hydraulic synchronous lifting process details the technical key points such as lifting point setting, lifting angle control, lifting and windproof measures, hydraulic lifting force control, hydraulic synchronous lifting control, etc. Finally, by utilizing this option, the quality, construction schedule, safety and cost for the overall lifting of units aloft can be guaranteed and good results are achieved in practice.
Highlights
Project IntroductionChongqing Raffles Square Project is located between Chongqing Chaotianmen Square and Jiefangbei, including 8 towers, namely T1, T2, T3S, T3N, T4S, T4N, T5 and T6, as well as the air corridor at the top of T2, T3S, T4S, T5 towers (see Figure 1)
2) Option 2: Overall lifting of the aluminum plate unit The complete semi-arc aluminum plates between towers are selected for lifting the entire piece, and the remaining portion is installed by erecting a scaffold platform on the tower
The keel and panel are assembled by erecting a tire frame on the ground, and the overall lifting is realized by the hydraulic equipment fixed on the steel structure [6]
Summary
Chongqing Raffles Square Project is located between Chongqing Chaotianmen Square and Jiefangbei, including 8 towers, namely T1, T2, T3S, T3N, T4S, T4N, T5 and T6, as well as the air corridor at the top of T2, T3S, T4S, T5 towers (see Figure 1). The sightseeing air corridor is about 193m high from the ground, and the top elevation is about 220.9m. The basic unit comprises 83 round rings made of steel structure. It is elliptical with alternating peaks and valleys on the façade, which symbolize the “terrace and pit culture” unique to Chongqing. The aluminum plate curtain walls are located at the lower part of the sightseeing overpass, with the spans of 48.5m, 52.6m and 54.1m respectively, and the lengths of the cantilever sections are 25.1m and 26.8m. It is difficult to fix the aluminum plate surface layer and the main steel structure at the base by the V-shaped steel frame [1]
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