Expansion Anchor Bulged Zone for Lateral Load Stability
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Solution Overview
Problem
Existing expansion anchors face challenges in providing reliable performance, especially in laterally loaded situations, while being easy to manufacture and cost-effective, and they often require complex designs that interfere with the anchoring mechanism.
Innovation Solution
The expansion anchor design includes a bulged zone on the anchor bolt between the abutment and rear zones, which radially protrudes to enhance lateral load transfer and symmetry, allowing for improved performance without interfering with the anchoring mechanism, and can be manufactured using cross wedge rolling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex design with webs or rotational locks is used to improve lateral load performance, then anchor reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention applies local quality by creating a bulged zone with locally increased diameter at a specific position on the anchor bolt (between the abutment zone and rear zone, spaced from the abutment zone). This localized geometric modification provides enhanced lateral load transfer capability without requiring complex structural features throughout the entire anchor assembly, thus improving reliability while maintaining simplicity.
2Strength
If the anchor bolt diameter is increased to improve lateral load capacity, then strength is improved, but ease of installation and hole fit reduce
Solution Approach 1:
The bulged zone provides increased lateral load capacity through localized diameter increase only where needed for force transfer to the hole wall. The rest of the anchor bolt maintains its original diameter, ensuring easy installation and proper fit within the hole. This resolves the contradiction by concentrating the diameter increase functionally where it provides benefit without compromising installation ease.
3Reliability
If a bulged zone is added to transfer lateral loads, then anchor performance is improved, but manufacturing complexity increases
Solution Approach 1:
The bulged zone is created by modifying the geometric parameter (diameter) of the anchor bolt in a specific region. This can be achieved through conventional manufacturing methods such as cross wedge rolling or localized forming processes, which modify the diameter parameter without requiring complex multi-step manufacturing sequences. The simple geometric change maintains manufacturing ease while achieving the performance benefit.
4Strength
If the bulged zone is positioned close to the abutment zone to maximize lateral load transfer, then strength is improved, but interference with the anchoring mechanism occurs
Solution Approach 1:
The bulged zone is positioned at a predetermined location (spaced from the abutment zone) that was determined through analysis to optimize lateral load transfer while avoiding interference with the anchoring mechanism. This preliminary positioning ensures that the expansion shell can freely expand and engage the hole wall without obstruction from the bulged zone, while still allowing the bulged zone to effectively transfer lateral loads to the surrounding substrate.
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 bulged zone effectively transfers lateral loads into the surrounding hole wall, enhancing anchor performance and symmetry, facilitating easier manufacturing and installation, while maintaining efficient anchoring without detrimental interference.
Implementation Method 1
the bulged zone can directly transfer lateral loads into the surrounding hole wall
Implementation Method 2
the web is displaced radially outwardly by the wedge zone of the anchor bolt, i.e. the material of the web is activated, to yield particularly wide expansion
Data Source
AI summary
An expansion anchor including an anchor bolt, and at least one expansion shell located at the anchor bolt, wherein the anchor bolt includes a wedge zone for expanding the at least one expansion shell, an abutment zone forming a rearward stop for the expansion shell, the abutment zone being located rearwardly of the wedge zone, and a rear zone for intruding tensile force into the anchor bolt, the rear zone being located rearwardly of the abutment zone, and wherein, located between the abutment zone and the rear zone, and spaced from the abutment zone, the anchor bolt includes a bulged zone, which radially protrudes on the anchor bolt.