Segmented Expansion Bolt for Multi-Material Wall Anchoring
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Solution Overview
Problem
Current anchor devices are inadequate for anchoring on diverse types of walls, including those with low-consistency materials like bricks with internal webs and friable materials, as well as compact materials like concrete and natural stone, due to their specific design limitations.
Innovation Solution
A multifunctional anchor device featuring an expansion bolt with an ogival head, longitudinal slots for radial expansion, and a deformable tubular body with anti-rotation features, allowing for effective anchoring on various wall types by increasing friction and minimizing damage through a customizable deformation mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional expansion bolt with a simple tubular structure is used, then the device complexity is low, but the adaptability to different wall types is insufficient
Solution Approach 1:
The expansion bolt is divided into multiple functional segments: an ogival head portion with longitudinal slots for radial expansion, a deformable tubular body portion with transverse slots for lateral expansion, and anti-rotation fins. Each segment performs a specific anchoring function that adapts to different wall material characteristics, thereby achieving versatility without excessive complexity.
Solution Approach 2:
The expansion bolt incorporates dynamic deformation mechanisms where the tubular body can change shape under loading. The transverse slots allow the tubular body to deform laterally and engage with wall material, providing adaptive anchoring that responds to the mechanical properties of different wall types rather than relying on a fixed rigid structure.
2Strength
If an expansion bolt with high expansion force is used, then the anchoring strength is improved, but the damage to the internal surface of the wall increases
Solution Approach 1:
The expansion bolt applies expansion force locally through targeted deformation zones. The ogival head portion with longitudinal slots expands radially to engage with the wall, while the deformable tubular body with transverse slots expands laterally at a different location. This localized expansion approach concentrates anchoring force at specific points rather than uniformly across the entire bolt, reducing overall damage to the wall's internal surface while maintaining strong anchoring.
3Adaptability or versatility
If a deformable tubular body with transverse slots is used, then the adaptability to friable and compact materials is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The deformable tubular body is segmented with transverse slots at specific positions along its length. These slots create discrete deformation zones that allow controlled lateral expansion at predetermined locations. The segmentation approach simplifies manufacturing by using standard slot-cutting processes at defined positions, rather than requiring complex continuous deformation mechanisms, thereby balancing adaptability with manufacturability.
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 anchor device ensures reliable anchoring on different types of walls by adapting its expansion behavior and reducing damage to the internal surface, enhancing its load-bearing capacity and versatility across diverse structural materials.
Implementation Method 1
a fastening screw (3) inserted in the expansion bolt (2) to cause a plastic deformation of the expansion bolt (2) inside the hole
Implementation Method 2
ensuring an effective anchoring on different types of walls by increasing friction
Data Source
Figure 1
Figure 2~3
Figure 4~8
AI summary
An anchor device (1) comprising an expansion bolt (2) and a fastening screw (3) of the bolt (2) to a wall; the bolt (2) comprises a tubular body provided with a hole (27) which extends along the longitudinal axis (A) of the tubular body itself so as to accommodate the fastening screw (3); the tubular body further comprises a central shank (4) and a head (5), which is integrally made with the central shank (4) and comprises a full solid body on which a pair of longitudinal reciprocally perpendicular through slots (7) are made which delimit four anchor segments (8) adapted to spread outwards under the bias of the fastening screw (3).