Hat-Type Steel Sheet Pile Web Angle Optimization
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Solution Overview
Problem
Existing hat-type steel sheet piles face challenges in optimizing both economic efficiency and workability while maintaining integrity, as increasing cross-sectional size to reduce penetration resistance can lead to deformation and manufacturing costs, and thinning the steel sheet thickness may cause local buckling and performance deterioration.
Innovation Solution
The solution involves setting a relationship among geometrical moment of inertia, weight per unit wall area, penetration resistance, and web angle to satisfy specific expression groups, which balances economic efficiency and workability indicators, and ensures the integrity of the steel sheet pile by controlling the height to web thickness ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cross-sectional size of the steel sheet pile is enlarged to increase the geometrical moment of inertia, then the rigidity of the wall body is improved and deformation is reduced, but the penetration resistance increases and workability deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the web angle θ within a specific range (40° to 80°) to simultaneously achieve adequate rigidity and reduced penetration resistance. By adjusting this geometric parameter, the cross-sectional shape is modified to balance structural performance with installation workability, resolving the contradiction between wall rigidity and penetration ease.
Solution Approach 2:
The patent introduces dynamic adaptability by providing multiple cross-sectional shape options with different web angles and dimensional ratios. This allows the selection of appropriate parameters based on specific application conditions, enabling the structure to adapt between requiring high rigidity or good penetration performance depending on the project needs.
2Strength
If the steel sheet thickness is increased to improve strength and rigidity, then the geometrical moment of inertia increases, but the cross-sectional area and steel weight increase reducing economic efficiency
Solution Approach 1:
The patent changes the geometric parameters of the cross-section, specifically optimizing the web angle θ and the ratio of height to flange width, to achieve higher geometrical moment of inertia with reduced material quantity. This allows maintaining structural strength while reducing steel weight and improving economic efficiency.
Solution Approach 2:
The patent transitions from considering only thickness to optimizing multiple dimensional parameters including web angle, height, and flange width ratios. By distributing the structural performance requirements across multiple dimensions rather than relying solely on increased thickness, the design achieves strength with reduced overall material consumption.
3Weight of moving object
If the steel sheet thickness is reduced to improve economic efficiency, then the cross-sectional area is reduced, but local buckling occurs and manufacturing precision deteriorates
Solution Approach 1:
The patent optimizes the web angle θ within 40° to 80° and controls the height-to-flange-width ratio to enhance structural stability. These parameter optimizations prevent local buckling even with reduced thickness by improving the overall structural configuration, thereby maintaining manufacturing precision and integrity while reducing material usage.
Solution Approach 2:
The hat-type cross-sectional shape itself acts as a composite structural configuration that distributes stresses more effectively. The optimized geometry creates a structurally efficient form that resists buckling without requiring increased material thickness, maintaining integrity while improving economic efficiency.
4Strength
If the web angle is increased to improve the geometrical moment of inertia, then the rigidity increases, but the penetration resistance increases and workability deteriorates
Solution Approach 1:
The patent identifies and optimizes the web angle θ as a critical parameter, setting it within the range of 40° to 80° to achieve the optimal balance between geometrical moment of inertia and penetration resistance. This parameter optimization directly resolves the contradiction by finding the sweet spot where both rigidity and workability are satisfied.
Data Source
AI summary
The present invention provides a hat-type steel sheet pile whose economic efficiency, workability, and integrity are all optimized. In the hat-type steel sheet pile according to the present invention, web portions are continuously formed at both ends of an upper flange portion, and lower flange portions are formed at respective end portions of a pair of web portions. A relationship among geometrical moment of inertia I per 1 m of wall width (cm4/m) when forming a steel sheet pile wall, weight per unit wall area W (kg/m2), penetration resistance R, and web angle θ (°) is set to satisfy one of several expression groups.