Concave Anchor Dowel for Concrete Tensile Load Distribution
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Solution Overview
Problem
Existing anchor plugs are unable to effectively absorb high forces, particularly tensile forces, leading to damage and potential collapse of structures like double walls, as they concentrate stress peaks in brittle materials like concrete, resulting in sudden loss of load-bearing capacity.
Innovation Solution
An anchor dowel with a concavely curved surface pointing towards the tensile force direction, made of plastic with an internal thread and optional reinforcement, distributes forces over a larger area, enhancing load-bearing capacity and resilience through homogeneous stress distribution and flexible material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional anchor plugs with flat surfaces are used, then the structure is simple and easy to manufacture, but the load-bearing capacity is limited and stress peaks cause concrete damage
Solution Approach 1:
The anchor dowel features a concavely curved surface (hyperbolic or parabolic contour) instead of a flat surface. This curvature distributes tensile forces over a larger area of the surrounding concrete, reducing stress peaks and preventing localized concrete damage while maintaining high load-bearing capacity.
Solution Approach 2:
The invention changes the geometric parameters of the anchor dowel surface from flat to concavely curved. This parameter change transforms the stress distribution pattern from concentrated to distributed, allowing the anchor to withstand higher tensile forces without causing concrete failure.
2Reliability
If anchor plugs made of rigid materials are used, then manufacturing precision is easier to achieve, but the material cannot compensate for pressure differences and stress peaks
Solution Approach 1:
The invention changes the material parameter from rigid (metal) to elastic (plastic). This allows the anchor dowel to compensate for pressure differences and stress peaks through elastic deformation, improving reliability under varying load conditions while remaining manufacturable through injection molding.
Solution Approach 2:
The anchor dowel can be made from plastic materials with added fillers or reinforcements (such as glass fibers or metal inserts). This composite approach combines the elasticity and stress-distribution benefits of plastic with the strength and rigidity of reinforcing materials, achieving both resilience and 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 dowel significantly increases the load-bearing capacity and resilience of connections, allowing for higher tensile force absorption and maintaining load-bearing capacity even after initial crack formation, reducing the risk of structural failure.
Implementation Method 1
Compared to other possible materials, such as metal, plastic exhibits higher elasticity, which allows it to compensate for pressure differences under load
Implementation Method 2
This design of the surface facing the direction of the tensile force ensures that forces introduced into the anchor bolt and the surrounding mass, for example concrete, are distributed over a large area. This reduces stress peaks and thus local overloads of the material surrounding and supporting the anchor bolt
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
The invention relates to an anchor dowel (2, 2') which is to be embedded in a mass that can be poured and set, in particular concrete (42), said dowel having a receiving section (6) for a connecting element (34, 36) that is to be held by means of the anchor dowel (2, 2'). The anchor dowel (2, 2') has a surface (4) facing the direction (Z) of tensile force, said surface being substantially concave.