Expansion Anchor Sleeve Abutment for High Pull-Out Resistance
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Solution Overview
Problem
Existing expansion anchors face challenges in achieving high performance while being easy to manufacture, and they often overstress the substrate due to high expansion forces, leading to premature pull-out failures and reduced concrete capacity.
Innovation Solution
The expansion anchor incorporates an expansion sleeve abutment wall that temporarily interlocks with the expansion sleeve during installation, creating a form-fit that increases pull-out resistance without significant expansion force, thereby enhancing the anchor's performance and concrete capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high expansion force is applied to expand the expansion sleeve, then the anchor can be installed and secured, but the substrate (concrete) is overstressed leading to premature pull-out failures
Solution Approach 1:
The expansion sleeve abutment wall is pre-positioned on the expansion body to create a form-fit interlock with the expansion sleeve during installation. This preliminary structural arrangement allows the anchor to achieve secure installation through the form-fit mechanism rather than relying solely on high expansion forces, thereby preventing substrate overstress and premature pull-out failures
2Strength
If the expansion sleeve is expanded significantly to increase pull-out resistance, then anchor performance improves, but the expansion force increases causing substrate damage
Solution Approach 1:
The expansion sleeve abutment wall creates a form-fit interlock structure during installation that preliminarily establishes high pull-out resistance. This pre-formed mechanical interlock allows the anchor to achieve enhanced pull-out resistance without requiring significant expansion of the expansion sleeve, thereby avoiding the need for high expansion forces that would damage the substrate
Solution Approach 2:
The expansion body is segmented to include a specific abutment wall structure that interacts with the expansion sleeve. This segmentation creates a dedicated form-fit interface that provides mechanical interlock and pull-out resistance independently of the overall expansion force applied to the expansion sleeve
3Ease of manufacture
If standard expansion anchor design is used, then manufacturing is simple, but concrete capacity and pull-out loads are limited
Solution Approach 1:
The expansion sleeve abutment wall is integrated into the expansion body as a pre-formed structural feature that creates form-fit interlock during installation. This preliminary structural arrangement significantly enhances concrete capacity and pull-out loads while maintaining manufacturing simplicity, as the abutment wall is formed as part of the expansion body rather than requiring separate complex components or assembly steps
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
This design significantly improves the anchor's pull-out loads and concrete capacity, reduces substrate stress, and provides a smooth force-displacement characteristic, allowing for higher load activation without overstressing the concrete.
Implementation Method 1
an expansion body (12) for the expansion sleeve (30) provided on the anchor bolt (10), wherein the expansion body (12) has a converging zone (23) for expanding the expansion sleeve (30)
Implementation Method 2
the expansion sleeve (30) can hit the at least one expansion sleeve abutment wall (60), so that a form-fit interlock is created between the expansion sleeve (30) and the expansion body (12)
Data Source
AI summary
An expansion anchor having an anchor bolt, an expansion sleeve surrounding the anchor bolt, and an expansion body located in a front region of the anchor bolt, wherein the expansion body has a converging zone for expanding the expansion sleeve. The expansion body has at least one expansion sleeve abutment wall facing the expansion sleeve. The invention also relates to a method for using such an expansion anchor.