Double-Shell Containment Rebar Layout for Base Slab Strength
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Solution Overview
Problem
The construction of a double shell containment vessel with an outer shell results in decreased structural strength due to enlarged intervals between rebars, leading to a reduced density of meridian rebars in the outer shell, which compromises the structural integrity of both the outer shell and the base slab.
Innovation Solution
Implementing a system of inner and outer shell radial rebars with a common radial rebar configuration, where the number of common rebars is the greatest common divisor of the inner and outer shell radial rebar counts, ensuring overlapping angles and increased density, thereby reinforcing the structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double shell containment vessel with an outer shell is constructed, then the containment structure is enhanced, but the structural strength decreases due to enlarged intervals between rebars
Solution Approach 1:
The patent divides the rebar system into three distinct segments: inner shell radial rebars, outer shell radial rebars, and common radial rebars. This segmentation allows each rebar group to serve specific functions while maintaining optimal spacing, thereby preserving structural strength while achieving the double shell containment configuration.
Solution Approach 2:
The patent applies different rebar configurations to different regions: common radial rebars are strategically positioned where both inner and outer shells require reinforcement, while inner-specific and outer-specific radial rebars address regional needs. This local optimization ensures adequate rebar density throughout the structure without requiring uniform increases in rebar quantity.
2Reliability
If the outer shell is added to form a double shell containment, then the containment capability is improved, but the density of meridian rebars in the outer shell is reduced
Solution Approach 1:
The rebar system is segmented into common radial rebars that serve both shells and dedicated outer shell radial rebars. This segmentation ensures that the outer shell receives sufficient rebar density through the dedicated rebars while the common rebars provide shared structural support, thereby maintaining high rebar density in the outer shell despite its larger size.
Solution Approach 2:
The common radial rebars perform multiple functions: they reinforce both the inner and outer shells simultaneously and serve as anchoring points for both rebar systems. This multi-functionality allows the outer shell to achieve adequate reinforcement density without requiring a proportional increase in total rebar quantity.
3Strength
If the number of radial rebars is increased to maintain density, then the structural strength is improved, but the complexity of rebar arrangement increases
Solution Approach 1:
Instead of uniformly increasing rebar quantity throughout the entire structure, the patent applies rebar enhancements locally where needed: common radial rebars at shared positions, inner shell radial rebars for the inner containment, and outer shell radial rebars for the outer containment. This localized approach maintains structural strength while avoiding the complexity of a uniformly dense rebar arrangement.
Solution Approach 2:
Rather than starting with a dense uniform rebar pattern and reducing it, the patent inverts the approach by starting with the minimal required rebar configuration and strategically adding common, inner, and outer radial rebars only where structurally necessary. This inversion simplifies the overall arrangement while maintaining adequate strength.
Data Source
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AI summary
According to an embodiment, a nuclear plant has: a plurality of inner shell radial rebars 27 that are arranged at least partially in a base slab 26 of a double shell containment vessel 20, arranged radially having a center line of the base slab as a center of radiation angle, and penetrate an inner shell base part 21a; a plurality of outer shell radial rebars 28 that are arranged radially having the center line of the base slab as a center of radiation angle, and penetrate the outer shell base part 22a; and a plurality of common radial rebars 29 that penetrate both the inner shell base part 21a and the outer shell base part 22a, being a part of the inner shell radial rebars 27 and also a part of the outer shell radial rebars 28, wherein the number of the outer shell radial rebars 28 is larger than the number of the inner shell radial rebars 27; and the maximum number of the common radial rebars 29 is equal to the greatest common divisor of the number of the inner shell radial rebars 27 and the number of the outer shell radial rebars 28.