Cast-in-place UHPC Shielding Shell for Nuclear Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional reinforced concrete and steel plate-concrete shielding shells for nuclear power plants are inefficient due to large thickness requirements, long construction periods, high construction and maintenance costs, and difficulty in construction.
Innovation Solution
A cast-in-place composite shielding shell using ultra-high performance concrete (UHPC) with a rigid dismantling-free formwork and reinforced concrete (RC) layers, connected by connectors, and a back anti-crack panel to enhance impact resistance and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reinforced concrete shielding shells are used, then protective effect is achieved, but thickness is large and construction period is long
Solution Approach 1:
The patent uses a composite structure consisting of UHPC layer, RC layer, and steel plate layer. The UHPC provides high strength and impact resistance, the RC layer provides ductility and crack control, and the steel plate provides additional strength. This composite material approach achieves the required protective effect with reduced thickness compared to conventional RC shielding shells.
Solution Approach 2:
The patent changes the material parameters by using ultra-high performance concrete with compressive strength not less than 150 MPa, which is significantly higher than conventional concrete. This parameter change allows for thinner shielding shell thickness while maintaining or improving the protective effect.
2Length of stationary object
If steel plate-concrete shielding walls are used, then thickness is reduced, but construction difficulty and cost increase
Solution Approach 1:
The shielding shell is segmented into three distinct layers: UHPC layer, RC layer, and steel plate layer. Each layer has specific functions and can be constructed using different methods. The UHPC layer can be cast in-place, the RC layer provides structural support, and the steel plate layer provides reinforcement. This segmentation allows for flexible construction approaches and reduces overall construction difficulty.
Solution Approach 2:
The composite structure serves multiple functions simultaneously: the UHPC layer provides impact resistance and strength, the RC layer provides ductility and crack control, and the steel plate layer provides additional strength and confinement. This multi-functionality allows the shielding shell to achieve required protection with reduced thickness while maintaining constructability.
3Reliability
If conventional reinforced concrete shielding shells are used, then protective effect is achieved, but construction cost is high
Solution Approach 1:
By using UHPC with compressive strength not less than 150 MPa, the patent achieves higher strength-to-cost ratio. Although UHPC material cost is higher, the reduced thickness and shorter construction period result in lower overall construction cost compared to conventional RC shielding shells of equivalent protective effect.
Solution Approach 2:
The UHPC layer provides self-confinement and self-protection due to its high strength and toughness characteristics. The material inherently resists impact and projectile penetration without requiring additional protective measures, reducing overall system cost while maintaining protective effect.
4Reliability
If conventional reinforced concrete shielding shells are used, then protective effect is achieved, but impact resistance and toughness are insufficient
Solution Approach 1:
The patent creates a composite material system where UHPC, RC, and steel plate work together. The UHPC layer with high strength and toughness provides primary impact resistance, the RC layer provides ductility and energy absorption through controlled cracking, and the steel plate layer provides additional strength and confinement. This composite approach achieves superior impact resistance compared to conventional RC shielding shells.
Solution Approach 2:
The patent applies different material qualities to different layers: the UHPC layer has high strength and toughness for impact resistance, the RC layer has ductility for energy absorption, and the steel plate has high strength for confinement. This local quality differentiation optimizes the overall impact resistance of the shielding shell.
Data Source
AI summary
The purpose of the present invention is to disclose a cast-in-place composite shielding shell with ultra-high performance concrete (UHPC), comprising an UHPC layer, rigid dismantling-free formworks, a RC layer, and a back anti-crack panel; the rigid dismantling-free formworks are disposed between the UHPC layer and the RC layer, and the RC layer is disposed between the UHPC layer and the back anti-crack panel; the RC layer and the UHPC layer are connected and fixed to each other by means of connectors. Compared with the prior art, the UHPC layer has higher strength and toughness, and is not prone to breakage and splashing under high-speed impact, and the back anti-crack panel prevents the presence of scabs on the back, and can better maintain the overall stress performance of the impacted site, thereby reducing damage to a main structure caused by the impact of a projectile, thus achieving the purpose of the present invention.