Expandable Ground Anchor Linkage Mechanism
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Solution Overview
Problem
Existing ground anchors often lack sufficient capacity relative to their length, particularly in situations where underground space is limited.
Innovation Solution
A ground anchoring apparatus featuring a first longitudinal body, retaining members, and expanding linkage assemblies that can transition from a collapsed to an expanded configuration, increasing the anchor's capacity by altering its critical shear surface geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional ground anchors with cylindrical geometry are used, then the structure is simple and easy to install, but the capacity relative to length is insufficient
Solution Approach 1:
The ground anchor transitions from a static cylindrical geometry to a dynamic expandable structure. The anchor body can expand radially outward from its initial compact configuration to a larger diameter configuration, allowing the same anchor to provide different capacity levels without changing its installed length. This dynamic transformation resolves the contradiction by enabling higher capacity within the same length constraint.
Solution Approach 2:
The invention introduces radial expansion capability, adding a dimensional transformation aspect to the traditionally linear anchor. By expanding in the radial dimension (perpendicular to the anchor's longitudinal axis), the anchor increases its surface area and geometric dimensions without extending its length along the borehole. This dimensional change allows capacity enhancement while maintaining length constraints.
2Strength
If the length of ground anchors is increased to provide more capacity, then the anchor capacity increases, but the underground space requirements are not met
Solution Approach 1:
The expandable anchor provides a dynamic volume solution where the anchor occupies a compact volume during installation but expands to a larger volume after installation to provide increased capacity. This temporal separation of compact installation state and expanded operational state resolves the contradiction between needing high capacity and limiting underground space occupation.
Solution Approach 2:
The anchor structure employs a nested configuration where the expandable components are contained within each other in the retracted state, similar to nested dolls. This nesting allows the anchor to be installed in a compact form through the borehole and then deployed to occupy a larger volume in the surrounding ground, resolving the space contradiction.
3Strength
If ground anchors with increased capacity are designed, then the shear strength mobilization area increases, but the device complexity increases
Solution Approach 1:
The expandable anchor is divided into multiple segments or modular components that can independently expand and lock into position. This segmentation allows the complex expansion mechanism to be broken down into manageable sections, each contributing to the overall capacity increase while maintaining relative structural simplicity through modularity.
Solution Approach 2:
The invention employs curved or spherical geometric elements in the expandable mechanism, such as wedge-shaped expanders or spherical expansion joints. These curved geometries naturally distribute stresses and simplify the mechanical linkage required for expansion, reducing overall device complexity while achieving the desired increase in shear strength mobilization area.
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 apparatus enhances the ground anchor's capacity by increasing the surface area over which shear strength is mobilized, effectively addressing the limitations of traditional ground anchors.
Implementation Method 1
Each of the one or more expanding linkage assemblies includes a first linkage member and a second linkage member... The first set of one or more expanding linkage assemblies is movable between a collapsed configuration and an expanded configuration
Data Source
AI summary
Various implementations include a ground anchoring apparatus including a longitudinal body, first and second retaining members, and a set of expanding linkage assemblies. The first retaining member is rigidly coupled to the longitudinal body. The second retaining member is movably coupled to the longitudinal body. Each expanding linkage assembly includes first and second linkage members. The first linkage member has first and second portions, and the second linkage member has third and fourth portions. The first portion is rotatably coupled to the first retaining member. The fourth portion is rotatably coupled to the second retaining member. The third portion is rotatably coupled to the second portion. The set of expanding linkage assemblies is movable between a collapsed and expanded configuration. The second retaining member is closer to the first retaining member and the third portion is further from the central axis in the expanded configuration than in the collapsed configuration.