A Design Method for Composite Protection Board Foundation of Transmission Tower in Mining Area

Abstract

The invention discloses a design method for a composite protective plate foundation of an electricity transmission pylon in a mining area. The simplified design method includes: determining of thickness value of the composite protective plate foundation, calculating of equivalent net reaction at the bottom of the foundation, dividing of equivalent plate strips, distributing of bending moment of the plate strips and reinforcement calculation of sections of the plate strips. Under a supposed condition of an elastic foundation, according to equivalent net reaction value of a base under the action of surface deformation, the internal design method for the composite protective plate foundation in the mining area under the action of the horizontal surface deformation is provided, a simplified method for calculating internal force of the composite protective plate foundation under the surface curvature deformation by the equivalent plate strip method is provided, and a method for section designing of the composite protective plate foundation is provided. The simplified design method is simple in principle and convenient to use, calculation results can meet requirements of engineering practice, and the design method has wide practicability.

Description

technical field [0001] The invention relates to the calculation of the internal force and the design of the cross-section of the composite protective plate foundation of the transmission iron tower (the composite protective plate added under the foundation of the independent long column of the iron tower) affected by mining in the coal mining subsidence area. Background technique [0002] Coal is the foundation of my country's industrial power. Due to the large-scale mining of coal resources, a large number of coal mining subsidence areas have been caused. On the other hand, my country is currently vigorously promoting the policy of "transforming coal transportation into electricity transmission", resulting in a large number of new transmission lines inevitably being built in coal mining subsidence areas. At present, a large number of transmission towers use independent foundations, whose ability to resist uneven settlement and deformation of the ground surface is weak, caus...

AI Technical Summary

Problems solved by technology

At present, a large number of transmission towers use independent foundations, whose ability to resist uneven settlement and deformation of the ground surface is weak, causing a large number of tower foundations to have different degrees of vertical uneven settlement, relative displacement in the horizontal direction, and overall inclination of the tower, which is extremely large. It changes the original stress state of the iron tower, makes the iron tower face the threat of damage, and brings difficulties to the safe and stable operation of the transmission line

In recent years, my country has successfully practiced the application of composite protective plate foundation instead of independent foundation to protect the superstructure from mining deformation. However, the existing engineering practice mainly relies on engineering experience. Sectional design did not propose a specific and feasible method

Therefore, in general, the design and application of the composite protective plate foundation of the transmission tower in the mining area in my country is still in the tentative stage, which has laid a huge security risk for the safety and long-term stable operation of the built and newly built transmission line projects. Hidden danger

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