Study on the Structure of Large Diameter Steel Pipe Wrapped with Concrete Cushion in Water Conveyance Engineering
To study the influence of cushion modulus and thickness on the stress distribution of steel pipe encased concrete structures in water conveyance engineering,and determine the optimal values of cushion parameters.This paper takes the second phase of the Hanjiang-to-Weihe River Water Transfers Project as the background,and uses finite element software to analyze and study the structure of large-diameter steel pipe wrapped with concrete cushion layer.Determine the stress state of steel pipes and outer concrete under different elastic modulus and thicknesses of the cushion layer.The results indicate that:after setting the cushion layer,the main stress of the outer concrete is signifi-cantly reduced,effectively improving the stress distribution of steel pipes and outer concrete;as the elastic modulus of the cushion layer de-creases,the equivalent stress of the steel pipe gradually increases,and the principal stress of the outer concrete gradually decreases;when the thickness of the cushion layer is less than 20 mm,the maximum principal stress of the outer concrete decreases with the increase of the cushion layer thickness.When the thickness is greater than 20 mm,the reduction of the maximum principal stress of the outer concrete is not significant,and the optimal thickness of the cushion layer is 10～20 mm.When comparing the elastic modulus and thickness of the cushion layer,the equivalent stress of the steel pipe and the principal stress of the outer concrete remain basically unchanged.This paper provides reference for the selection of large-diameter steel pipe wrapped concrete cushion structure in water transmission engineering.
water conveyance engineeringpressure steel pipeouter concreteflexible cushion layerstress distribution
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