Architectural features of Guang Zhouta.

The whole tower of Guang Zhouta is a hollow steel frame, with 24 steel columns twisted counterclockwise from bottom to top, and the cross section of each member is changing. The columns, beams and supports of steel frame tube are all in a three-dimensional inclined state, and the twisted steel frame tube is thick from top to bottom and thin in the middle, which brings challenges to the processing, manufacturing, installation, construction survey and deformation control of steel structure. The steel frame tube alone has 24 steel columns, 46 groups of ring beams and 1 104 diagonal braces. Because of the material difference between concrete core tube and steel structure outer frame tube in Guang Zhouta, the settlement of floor beam and outer frame tube is inconsistent. In order to adjust the correctness of the relative position between steel members and the main structure, many nodes control the accuracy of the relative position of steel columns through three-dimensional coordinates.

Energy conservation and environmental protection

Through the application and implementation of durable and sustainable building technology, Guang Zhouta has achieved good results in energy saving, land saving, material saving and water saving. The ratio of underground space construction area to construction area is 69%, which saves land resources. The annual output of photovoltaic system is estimated to be 12660 kWh. The annual output of wind turbines is about 4 1472 kwh. The annual water saving of reclaimed water is about 6.5438+200,000 tons. The proportion of recyclable building materials reaches 18%.

Innovative technology

Three-dimensional space measurement technology

Because of its special shape and super-high structure, Guang Zhouta requires high measurement accuracy. In view of this situation, it is determined to use GPS positioning system to establish a survey reference network to locate components in three-dimensional coordinates in the air. In order to meet the needs of steel structure installation and positioning, a spatial survey datum network is constructed. The spatial survey reference network consists of five spatial points and one ground point.

Comprehensive safety protection and isolation technology

The installation of steel structure in Guang Zhouta belongs to ultra-high altitude operation. Because of discontinuous floors, it is necessary to carry out ultra-high altitude suspension operation. The risk of injury caused by falling objects increases with the increase of height. A safe operation system consisting of vertical ladder, horizontal passage, boundary fence, operation platform and anti-falling isolation facilities is formulated.

Pre-deformation technology of special-shaped steel structure

Because Guang Zhouta has the structural characteristics of deflection and torsion, in the construction process, the structure will not only produce compression deformation, uneven settlement, but also produce large horizontal deformation, so pre-deformation control must be carried out, otherwise, even if the initial installation position is accurate, under the subsequent load, it will also produce large cumulative deformation, which will make the node deviate from the original design position. The pre-deformation scheme of step-by-step adjustment and circle-by-circle reset is formulated to compensate the deformation of steel structure under constant load.