The issue of reusing foundations for vertical atmospheric storage tanks.
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In the design of a certain project, the owner is required to construct 700 cubic meters of concrete sedimentation tanks. The parameters of these tanks are as follows: the inner diameter of the tank is 10,200 mm, the height H is 8,060 mm; the maximum weight of the tank when filled with water is 694 tons. The local seismic intensity is 7 degrees, and the basic design seismic acceleration is 0.1g. The medium contained within the tanks is oily wastewater, and the design temperature is 75°C. The client now wants to use the existing tank foundation; the diameter of the ring beam of the old tank foundation is 10,500 mm. According to the specifications, the inner diameter of the storage tank should be equal to the inner diameter of the ring beam. The owner currently wants to make use of the existing tank foundation; if construction is carried out forcefully, will this cause the edge plates at the bottom of the tank to warp in the future? Additionally, this tank has cleaning holes. Since the ring beam is larger than the inner diameter of the storage tank, it is necessary to break away part of the ring beam during the installation of these cleaning holes; will this have an impact on the tank’s foundation? If the stationary ring beam is not moved, can the tube section of the cleaning hole be extended?
Based on the tank parameters and design conditions you provided, the analysis is as follows: 1. The inner diameter of the storage tank is 10,200 mm, while the diameter of the ring beam is 10,500 mm. According to regulatory requirements, the inner diameter of the storage tank should be equal to that of the ring beam. Therefore, if the existing tank foundation does not change the diameter of the ring beam, it may cause the bottom edge plate of the tank to warp. Furthermore, since the medium in the storage tank is oily wastewater with a design temperature of 75°C, the warping of the bottom edge plates over time may affect the stability and safety of the tank; therefore, this issue cannot be ignored. 2. During the installation of the cleaning hole, it is necessary to break away some of the ring girders, which may affect the tank foundation. The extension of the cleaning hole also requires consideration of its impact on the tank foundation. Therefore, before reusing the tank foundation, a comprehensive assessment is required, along with approval from a professional design firm, to ensure the stability and reliability of the tank foundation. .
The diameter at the bottom is 10,500, the length is 1,000 mm, with a cone added; the diameter at the top is 10,200 – that should do it