Concrete external wall prestress system establishment method

Abstract

The invention relates to a concrete external wall prestress system establishment method which includes the steps: 1) calculating initially applied tension control prestress of a prestress system; 2) respectively calculating prestress loss of circumferential horizontal prestress tendons and vertical prestress tendons; 3) respectively calculating effective prestress of the circumferential horizontal prestress tendons and the vertical prestress tendons; 4) respectively calculating the number of the circumferential horizontal prestress tendons and the number of the vertical prestress tendons to obtain the arrangement range of the prestress tendons of a whole concrete wall body; 5) calculating the reinforcement area of an anchor bed in the prestress system; 6) arranging the prestress tendons in the concrete wall body according to the obtained number of the circumferential horizontal prestress tendons and the obtained number of the vertical prestress tendons, and performing engineering reinforcement for the anchor bed according to the calculated area of anti-explosion spiral bars and plain bars to establish the concrete external wall prestress system. The method can be widely applied to establishing the concrete external wall prestress system for a large LNG (liquefied natural gas) full-capacity storage tank.

Description

technical field [0001] The invention relates to a method for establishing a concrete outer wall prestressing system, in particular to a method for establishing a concrete outer wall prestressing system suitable for large liquefied natural gas full-capacity storage tanks. Background technique [0002] When natural gas is cooled to -162°C under normal pressure, it changes from a gaseous state to a liquid state, that is, liquefied natural gas (LNG). The volume of liquefied natural gas is about 1 / 600 of the volume of the same amount of gaseous natural gas, and the density is about 480kg / m 3 . Liquefied natural gas is colorless, odorless, non-toxic and non-corrosive, and can evaporate directly after leakage. [0003] The prestressed system of the concrete exterior wall of the storage tank is an important part of the construction of the storage tank. Its design optimization is the focus and difficulty of the construction of the storage tank. Now many cities have launched the cons...

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Problems solved by technology

[0003] The prestressed system of the concrete exterior wall of the storage tank is an important part of the construction of the storage tank. Its design optimization is the focus and difficulty of the construction of the storage tank. Now many cities have launched the construction of land LNG receiving stations, but the existing technology The research on key issues such as the selection basis of the concrete external wall prestressing system of large LNG full-capacity storage tanks, the calculation of prestress loss, the determination of the number of horizontal prestressing tendons, the determination of the number of vertical prestressing tendons, and the optimization of safety design are still not yet complete. It is clear that there is no complete calculation method for prestressed structures, and there are technical gaps in domestic and foreign theoretical research. Therefore, it is urgent to develop a method for establishing a prestressed system for concrete exterior walls of large LNG full-capacity storage tanks.

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