Continuous Stirrup Rebar Cage for Structural Stability
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Solution Overview
Problem
Conventional rebar cages for beam structures are labor-intensive and costly to manufacture, with U-shaped stirrups requiring welding or tying, which is time-consuming and poses safety risks due to sharp ends, necessitating additional protective sheaths.
Innovation Solution
A rebar cage design featuring a continuous stirrup with specific geometric configurations and longitudinal tie bars, where the stirrup is formed with alternating rectangular turns and hooks to prevent injuries and reduce material usage, connected to the tie bars for enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If U-shaped stirrups are welded or tied to longitudinal rebars, then structural stability is improved, but manufacturing time and labor cost increase
Solution Approach 1:
The patent merges multiple stirrups into a single continuous stirrup that spans across multiple longitudinal rebars. Instead of welding or tying individual U-shaped stirrups to each rebar separately, the continuous stirrup integrates multiple functions into one component, significantly reducing manufacturing time and labor requirements while maintaining structural stability.
Solution Approach 2:
The continuous stirrup serves multiple functions simultaneously: it acts as a stirrup for multiple different longitudinal rebars, provides shear resistance across multiple sections, and eliminates the need for separate protective sheaths on each stirrup end. This multi-functionality resolves the contradiction by achieving structural stability without the time-consuming individual assembly processes.
2Ease of manufacture
If U-shaped stirrups are used with sharp free ends, then manufacturing simplicity is improved, but safety hazards increase due to injuries to personnel
Solution Approach 1:
The continuous stirrup merges the function of multiple separate stirrups into one unified component with rounded ends. This integration eliminates the sharp free ends that cause safety hazards while maintaining manufacturing simplicity, as the continuous design is formed as a single piece without requiring separate protective sheaths on each end.
Solution Approach 2:
The patent converts the potentially harmful sharp ends into beneficial rounded ends. By designing the continuous stirrup with rounded terminuses, it eliminates the injury risk to personnel while the same continuous structure maintains the ease of manufacture advantage. The rounded ends are formed as part of the continuous shaping process, turning a safety hazard into a safety feature.
3Object-affected harmful factors
If protective sheaths are added to stirrup ends, then worker safety is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The continuous stirrup merges the protective function into the stirrup structure itself by forming rounded ends as an integral part of the continuous design. This eliminates the need for separate protective sheaths, reducing manufacturing complexity and cost while maintaining worker safety. The protective feature is built-in rather than added as a separate component.
Solution Approach 2:
The continuous stirrup performs multiple functions: structural reinforcement, shear resistance, and worker protection through its rounded ends. By combining these functions into a single component, the patent avoids the complexity of assembling separate protective sheaths, achieving both safety and manufacturing simplicity simultaneously.
4Quantity of substance
If traditional rebar cage design is used, then material usage is standardized, but structural performance is reduced compared to optimized continuous designs
Solution Approach 1:
The patent changes the geometric parameters of the stirrup design by using a continuous configuration with specific dimensions (e.g., width of 50-100mm, height varying along the length). These parameter optimizations allow the continuous stirrup to provide enhanced structural performance while using less steel material compared to traditional discrete U-shaped stirrups, resolving the contradiction between material usage and structural strength.
Data Source
AI summary
A rebar cage is provided, which includes a continuous stirrup having two opposite lateral sections and a middle section located therebetween. The continuous stirrup includes a plurality of first portions extending along a Z-axis direction and located in the two lateral sections, a plurality of second portions connecting the tops of two adjacent first portions along an X-axis direction, and a plurality of third portions located in the middle region and each connecting the bottoms of two of the first portions along a Y-axis direction wherein a plurality of longitudinal tie bars extend along the X-axis direction and are connected to the first portions.