Drop-In Anchor Shear Absorbance Sleeve for Defined Failure
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Solution Overview
Problem
Existing anchor systems do not provide optimal load characteristics while being advantageous from a manufacturing and handling perspective.
Innovation Solution
An anchor system comprising a drop-in anchor with a shear absorbance sleeve and an anchor rod, where the shear absorbance sleeve has higher wall strength than the anchor sleeve, allowing it to absorb shear loads and provide well-defined failure modes, and a weaker anchor rod yield region for efficient material use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the anchor sleeve wall strength is increased to improve shear load performance, then the shear load capacity is improved, but the material usage and manufacturing complexity increase
Solution Approach 1:
The anchor system divides the load-bearing function into two separate components: the anchor sleeve handles axial expansion and anchoring forces, while the separate shear absorbance sleeve handles shear loads. This segmentation allows each component to be optimized for its specific function, with the shear absorbance sleeve providing targeted shear strength without requiring the entire anchor sleeve to have uniformly high wall strength, thus reducing overall material usage.
Solution Approach 2:
The shear absorbance sleeve acts as an intermediary component between the anchor sleeve and the attachment part. It specifically absorbs shear loads that arise at the interface between the substrate and the attachment part, preventing these shear forces from being transmitted to the anchor sleeve. This intermediary structure enables the anchor sleeve to maintain lower wall strength while the system as a whole achieves high shear load capacity.
2Quantity of substance
If the anchor rod cross-section is reduced to save material, then manufacturing cost is reduced, but the structural integrity and load-bearing capacity may be compromised
Solution Approach 1:
The shear load-absorbing function is extracted from the anchor rod and assigned to the separate shear absorbance sleeve. This allows the anchor rod to be designed with a smaller cross-section optimized for its primary function of providing tensile strength and connecting the attachment part to the anchor sleeve, while the shear absorbance sleeve independently handles shear loads, maintaining overall structural integrity with reduced material usage in the anchor rod.
3Reliability
If a predetermined yield region is created in the anchor rod to define failure mode, then load characteristics are well-defined, but the manufacturing precision requirements increase
Solution Approach 1:
The anchor rod features a local quality change with a reduced cross-section yield region at a specific location. This localized geometric modification creates a predetermined failure point that will yield first under excessive loads, providing a clear warning before catastrophic failure. The local quality change is simple in form (cross-sectional reduction) and can be manufactured with standard precision, avoiding complex manufacturing requirements while achieving reliable defined failure characteristics.
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 system achieves good shear load performance with defined failure characteristics and reduced material usage, while maintaining ease of manufacturing and handling.
Implementation Method 1
an expander plug that is able to be driven into an installed position within the anchor sleeve, in which the expander plug expands the expandable first end
Implementation Method 2
the anchor sleeve further comprises an internal thread for threadedly engaging the first external thread of the anchor rod
Implementation Method 3
The shear absorbance sleeve is thus able to absorb shear loads arising between the attachment part and the substrate, providing particularly good shear load performance
Data Source
Figure 1
Figure 2~5
AI summary
Anchor system comprising a drop-in anchor and an anchor rod. The anchor rod comprises an anchor rod first end, and a first external thread at the anchor rod first end. The drop-in anchor comprises an anchor sleeve having an expandable first end and an anchor sleeve second end. The drop-in anchor further comprises an expander plug. The anchor sleeve further comprises an internal thread for threadedly engaging the first external thread of the anchor rod. The drop-in anchor further comprises a shear absorbance sleeve that is provided at the anchor sleeve at the anchor sleeve second end of the anchor sleeve. The anchor rod passes through the shear absorbance sleeve. The shear absorbance sleeve has same outer cross section than has the anchor sleeve at the anchor sleeve second end. The shear absorbance sleeve has smaller inner cross section than has the anchor sleeve at the anchor sleeve second end.