Foundation Screw Variable Diameter Transition
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Solution Overview
Problem
Existing foundation screws face increased resistance during installation and reduced stability due to abrupt changes in the outer contour, leading to potential soil uplift and instability.
Innovation Solution
A foundation screw design featuring a tubular basic body with a helical screw thread, comprising cylindrical, tapering, and additional longitudinal portions with convex and concave jacket regions, ensuring a smooth transition and increased stability through a continuous contour that minimizes force exertion and soil compaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the foundation screw has an abrupt change in outer contour at the transition region, then the tapering portion can be produced by in-mold hammering or compression, but the resistance to being screwed in increases and stability is reduced
Solution Approach 1:
The patent applies curvature by replacing the abrupt angular transition with a rounded transition region having a radius of at least 5mm (preferably at least one-tenth of the outer diameter of the cylindrical portion). This curved transition eliminates the sharp corner while maintaining the functional distinction between the cylindrical and tapering portions, thereby reducing installation resistance without complicating the manufacturing process
2Ease of manufacture
If the foundation screw has an abrupt change in outer contour at the transition region, then the tapering portion can be produced by in-mold hammering or compression, but soil uplift occurs reducing stability
Solution Approach 1:
The rounded transition region with a radius of at least 5mm prevents soil uplift by eliminating the sharp corner that acts as a stress concentration point. The curved geometry distributes soil forces more evenly along the transition zone, preventing the soil from lifting away from the foundation screw and thereby maintaining both radial and axial stability
3Device complexity
If the transition region has a small radius (comparable to wall thickness), then the production process is simple, but the foundation screw presents increased resistance and reduced stability
Solution Approach 1:
The patent specifies a minimum transition radius of 5mm (or alternatively at least one-tenth of the outer diameter), which is significantly larger than typical wall thicknesses. This deliberate increase in transition radius simplifies the geometry compared to complex multi-radius profiles while dramatically reducing installation resistance and improving performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design allows for easier installation with reduced force and enhanced stability in both radial and axial directions, preventing soil uplift and voids, thereby improving the overall anchoring performance.
Implementation Method 1
which as a result of the wedge or positive displacement effect hardens the surrounding soil as it is being screwed in
Data Source
AI summary
A foundation screw with a tubular basic body having an encompassing helical screw thread for screwing into the ground. The foundation screw has a substantially cylindrical first longitudinal portion and a tapering second longitudinal portion. The first longitudinal portion merges tangentially with a convex jacket region of the second longitudinal portion having a radius of convexity R1, which has at least one value of the tube diameter D of the first longitudinal portion.