Steel structure of coal storage yard of Tuoketuo Power Plant
The prestressed space truss project of the large-span coal yard closed steel structure project. The overall width of the coal yard is 224.5 meters, of which the structural span is 222 meters, the structural length is 467 meters, and the structural height is 62.5 meters, with a total area of 104,000 square meters.
According to the structural characteristics and the site environment, careful consideration is given to reducing the construction height of the main truss of the coal shed, solving the problems of the radian of the middle section of the coal shed, and reserving the construction space of the horizontal cable structure. This method is the first in the construction of unsupported super-span prestressed steel structures in the past. The most significant advantage of this construction plan is that the height of aerial work is reduced to the lowest level from the ground as much as possible, effectively ensuring safe production.
The steel structure lifting of this project is divided into four cumulative lifting areas, and each cumulative lifting area is divided into two liftings, with a total lifting capacity of 5,800 tons. The first lifting area is one area, the cumulative lifting capacity is 1600 tons, and the first lifting height is 28 meters. After the first lifting is in place, the in-place truss with a weight of about 870 tons needs to be connected. The two trusses are connected into a whole and then the second lifting. Controlling the installation accuracy and welding deformation of the closing after lifting is the top priority in the lifting construction, including 32 closing joints of the upper and lower chords of the steel truss, the maximum cross-section of the high-altitude butt pipe is 600 mm, and the maximum wall thickness is 30 mm. The wall thickness of all the welds is the butt weld of the medium and heavy plate, which involves a lot of on-site welding workload, poor on-site welding environment conditions, and the quality of the weld is easily affected by windy weather and many other difficulties, and the installation and welding are difficult.
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