Concrete Lifting Anchor Collar Legs Shear Failure
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Solution Overview
Problem
Existing edge lift anchors for concrete panels face challenges in increasing load carrying capacity without excessive size and risk of shear failure when using tension bars, which often require larger cross-sectional dimensions for safety, leading to inefficiencies and potential failure modes.
Innovation Solution
An edge lift anchor design featuring a collar with integral legs that increase lifting capacity, optionally with an aperture for a tension bar, allowing for enhanced load distribution and reduced risk of shear failure, and a support chair system for rapid installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a tension bar is installed in the anchor aperture to increase load carrying capacity, then the lifting capacity is improved, but the risk of shear failure increases and the bar size must be larger than necessary
Solution Approach 1:
The invention divides the load-bearing function into two separate components: the collar with integral legs provides primary load distribution, while the tension bar provides secondary reinforcement. This segmentation allows the tension bar to be smaller in size since it doesn't need to carry the entire load alone, reducing the risk of shear failure while maintaining high load carrying capacity.
Solution Approach 2:
The collar with integral legs acts as an intermediary element between the anchor head and the tension bar. It distributes the applied load across multiple legs before transferring it to the tension bar, thereby reducing the stress concentration on the bar and minimizing the risk of shear failure at the bar-aperture interface.
2Reliability
If a tension bar with sufficient cross-sectional dimension is used to prevent shear failure, then reliability is improved, but the device complexity and installation time increase
Solution Approach 1:
By segmenting the load-bearing function between the collar legs and the tension bar, the invention allows use of a smaller, simpler tension bar that is easier to install and handle, while the collar legs provide the additional structural support needed to prevent shear failure.
Solution Approach 2:
The collar with integral legs is pre-installed on the anchor head before the tension bar is inserted. This preliminary action creates a load-distributing structure that simplifies the subsequent tension bar installation, allowing use of a smaller bar with reduced complexity while maintaining reliability.
3Strength
If the anchor is designed for high load carrying capacity from the beginning, then strength is improved, but the anchor size and weight increase
Solution Approach 1:
The invention creates a dynamic, modular anchor system where the collar with integral legs can be added to or removed from the anchor head depending on the required load carrying capacity. This allows the anchor weight to be optimized for each specific application rather than always using the heaviest design.
Solution Approach 2:
By separating the load-bearing components (collar with legs) from the basic anchor head, the invention allows users to add only the necessary weight for the required capacity. The modular segmentation enables weight optimization where the anchor system can be light when low capacity is needed and heavier only when high capacity is required.
Data Source
AI summary
An edge lift anchor for a concrete product, the anchor having a head portion for coupling to lifting equipment and an anchoring portion, and a separate member mounted on the anchor and having integral legs extending to each side of the anchoring portion to increase the lifting capacity of the anchor. Alternatively or in addition, the separate member may provide a mounting for a tension bar to increase the lifting capacity. The invention also provides a support chair for retaining the edge lift anchor, together with an associated shear bar and tension bar if present.