Asymmetric Strap Arrangement for High Tensile Ground Anchors
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Solution Overview
Problem
Ground anchor systems face limitations in achieving higher tensile strength within a given borehole diameter, as the arrangement of traditional straps restricts the number of straps that can be accommodated, making it difficult to withstand higher loads without increasing the system's external dimensions or using more expensive materials.
Innovation Solution
The ground anchor system employs a compact arrangement of straps with specific angular and spatial orientations within the borehole, allowing for a greater number of straps to be accommodated, which increases the system's tensile strength, using carbon-fiber-reinforced polymer straps with varying cross-sectional shapes and orientations to maximize space efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional strap arrangements are used in ground anchor systems, then the system can be installed in standard boreholes, but the number of straps that can be accommodated is limited, restricting the system's tensile strength
Solution Approach 1:
The patent applies asymmetry by positioning straps at non-uniform angular intervals around the longitudinal axis. Specifically, straps are arranged at angles of 0°, 60°, and 120° relative to a reference plane, creating an asymmetric configuration that optimizes space utilization within the borehole. This asymmetric arrangement allows three straps to be accommodated in a standard borehole without requiring excessive borehole diameter, thereby achieving higher tensile strength (2,880 KN) while maintaining compatibility with standard installation requirements.
Solution Approach 2:
The patent utilizes the angular dimension around the longitudinal axis to arrange multiple straps in three-dimensional space. By distributing straps at specific angular positions (0°, 60°, 120°) in the transverse plane while maintaining their longitudinal extension, the system effectively uses spatial arrangement in multiple dimensions to accommodate more straps within the same borehole diameter, thereby increasing overall tensile capacity without increasing external dimensions.
2Strength
If more straps are added to increase tensile strength, then the load-bearing capacity increases, but the external dimensions of the system must be increased
Solution Approach 1:
The patent implements nesting by arranging multiple straps concentrically around the longitudinal axis within the same borehole diameter. The straps are positioned at different angular positions (0°, 60°, 120°) but share the same radial envelope, effectively nesting them within the same spatial boundary. This nested arrangement allows three straps to be accommodated in a standard borehole, achieving tensile strength of 2,880 KN without increasing the borehole diameter, thus resolving the contradiction between strength and external dimensions.
3Strength
If carbon-fiber-reinforced polymer straps are used, then the system achieves high strength-to-weight ratio and corrosion resistance, but the cost of materials increases
Solution Approach 1:
The patent applies local quality by using carbon-fiber-reinforced polymer (CFRP) straps specifically in applications requiring high tensile strength and corrosion resistance, such as offshore environments or crowded construction areas. The CFRP material provides localized enhancement of strength-to-weight ratio and durability where these properties are critical, while the overall system design maintains cost-effectiveness through efficient spatial arrangement that accommodates three CFRP straps in a standard borehole, optimizing the balance between material cost and performance.
Data Source
AI summary
A ground anchor system configured for introducing into a borehole, and comprising a plurality of straps each having a length dimension extending along a central longitudinal axis of the ground anchor system. Each of said straps has a width dimension taken along a major axis and a thickness dimension taken along a minor axis. The major axis and the minor axis are disposed at a transverse plane of the ground anchor system and intersect at a middle point. The middle point of each of said straps is intersected by an imaginary line extending through the longitudinal axis at the transverse plane. The imaginary line forms an angle smaller than 90° with the major axis of the respective strap.