Expansion Anchor Wedge Surfaces for Aerated Concrete
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Solution Overview
Problem
Expansion anchors in soft building materials like aerated concrete face challenges in achieving high anchoring power due to the nature of their sawtooth profiles, which are ineffective in counteracting the porous structure and leading to reduced holding strength.
Innovation Solution
The expansion anchor features holding surfaces oriented in the opposite direction of traditional sawtooth profiles, with a significant proportion of the length dedicated to these surfaces, arranged at acute angles, and configured to act like wedges, increasing the outward compressive force when pulled out, thereby enhancing anchoring power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional sawtooth profile expansion anchors are used, then the structure is simple and easy to manufacture, but the anchoring power in soft building materials like aerated concrete is insufficient
Solution Approach 1:
The patent inverts the traditional sawtooth profile orientation. Instead of teeth pointing backward (opposite to pull-out direction), the holding surfaces are oriented to point forward in the direction of insertion. This inversion allows the expansion anchor to effectively engage with the porous structure of aerated concrete, converting the material's porosity from a weakness into an anchoring mechanism where the concrete fragments bridge between teeth and provide enhanced holding power.
Solution Approach 2:
The patent modifies the geometric parameters of the expansion anchor profile. The holding surfaces are designed with specific angles and distributions that optimize the mechanical interaction with aerated concrete. By changing the orientation and angular parameters of the profile surfaces, the anchor achieves superior performance in soft, porous materials while maintaining structural feasibility.
2Strength
If holding surfaces are oriented at acute angles to the longitudinal direction, then the outward compressive force increases and anchoring power improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies acute angles for the holding surfaces relative to the longitudinal direction, optimized to maximize outward compressive force during pull-out. These angular parameters are carefully selected to achieve the desired mechanical advantage while remaining compatible with standard manufacturing capabilities for injection-molded plastic components.
Solution Approach 2:
The holding surfaces with acute angles are strategically positioned in specific regions of the expansion anchor where they are most effective for generating compressive force. This localized optimization allows the acute-angled surfaces to concentrate their effect where needed most, reducing the overall manufacturing precision requirements compared to applying such stringent angles throughout the entire component.
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 configuration significantly increases the anchoring force by applying a high outward compressive force on the surrounding wall, reducing the risk of the anchor base breaking out and improving holding strength in aerated concrete.
Implementation Method 1
the retaining surfaces act like wedges, i. H. they act on a wall of a hole in which the expansion anchor is spread and anchored, with an outward compressive force
Data Source
Figure 1
AI summary
The invention relates to an expansion anchor (1) with two opposing webs (5) extending in a longitudinal direction and with spreading elements (6) projecting from the webs (5) on either side in the opposing circumferential direction and having a hook shape when the expansion anchor (1) is viewed laterally. According to the invention, the webs (5) are formed with retaining surfaces (7) in the shape of a truncated cone shell, which run at an acute angle relative to a longitudinal direction of the expansion anchor from the rear to the front. The retaining surfaces (7) become longer from the rear to the front and run at a more acute angle relative to the longitudinal direction of the anchor. The retaining surfaces (7) substantially improve anchoring of the expansion anchor (1) in a soft or porous anchoring base such as porous concrete.