Reusable Metal Sheet Pile Interlock Curvature Design
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Solution Overview
Problem
Metal sheet piles used in temporary structures often suffer from interlock damage when removed and reused, compromising the tightness and resistance of the structure due to inadequate drivability and reusability.
Innovation Solution
A metal sheet pile design featuring a central web with outwardly inclined flanges at an angle of at least 97°, an interlock with a convex bottom part and a triangular finger, and specific curvature and thickness ratios to enhance drivability and reusability while maintaining resistance to declutching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If metal sheet piles are driven in the ground and removed for reuse, then the structure can be temporary and reusable, but the interlock gets damaged which compromises tightness and resistance
Solution Approach 1:
The interlock features a rounded bottom part with a specific radius of curvature (R1) that satisfies a given inequation, allowing rotational movement during driving and removal without damaging the interlock. The curved geometry enables the interlock to rotate smoothly while maintaining structural integrity, resolving the contradiction between reusability and interlock integrity.
2Strength
If the interlock is designed for strong engagement, then resistance to declutching is improved, but drivability and rotational capacity deteriorate
Solution Approach 1:
The rounded bottom part of the interlock with specific curvature radius enables rotational movement during driving, improving drivability. Simultaneously, the finger geometry with specific width (W1) and distance from inclined flange (W2) satisfying a given inequation ensures strong engagement resistance. The curved geometry allows rotation during installation while maintaining strong lock engagement during service.
Solution Approach 2:
The invention optimizes geometric parameters including the radius of curvature R1, radial thickness T1, finger width W1, and distance W2, with their ratios satisfying specific inequations. These parameter optimizations enable the interlock to achieve both good drivability through rotation and strong resistance to declutching during removal.
3Ease of manufacture
If the interlock geometry is simplified, then manufacturing is easier, but rotational capacity and resistance to deformation during reuse deteriorate
Solution Approach 1:
The rounded bottom part of the interlock with specific curvature provides rotational capacity while maintaining a relatively simple geometry that can be manufactured using conventional methods. The curvature radius R1 satisfies a given inequation that balances manufacturing simplicity with rotational performance, allowing the interlock to rotate during driving and removal without complex geometry.
Data Source
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AI summary
The invention relates to a metal sheet pile comprising inclined flanges whose extremities are inclined at an angle α of at least 97° with respect to the neutral axis P1 and are extended by an interlock comprising consecutively: - A bottom part comprising an internal side and an external side separated by a radial thickness T1, the internal side extending along a first portion of circle whose center lies in a plane P2 perpendicular to plane P1 and whose radius of curvature R1 satisfies inequation (i) : 1.5≤R1/T1≤5 and the external side extending along a second portion of circle whose center lies in plane P2 and whose radius of curvature R2 is at least equal to R1+T1, - A finger having a projected width W1 on plane P1, the fingertip being separated from the inclined flange by distance W2, W1 and W2 satisfying the inequation (ii): 1.2≤W1/W2≤1.7