Support Ring Geometry for Concrete Lifting Anchor Breakout Resistance
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Solution Overview
Problem
Existing concrete lifting anchors are prone to failure due to concrete breakout or anchor rupture, particularly in thinner concrete elements, and increasing their depth or size complicates fabrication and is often ineffective.
Innovation Solution
A support ring is disposed around the concrete anchor within the concrete, featuring an inner and outer wall with upper and lower lips, oriented to redirect lifting forces, maintaining the anchor's center and limiting the ring's diameter to not exceed six times the anchor's height, thereby redistributing the load and preventing failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the depth or size of concrete lifting anchors is increased to prevent concrete breakout or anchor rupture, then the lifting capacity and reliability are improved, but the fabrication complexity and difficulty are worsened
Solution Approach 1:
The support ring is divided into distinct functional segments: an inner wall for confinement, an outer wall for load distribution, an upper lip for force redirection, and a lower lip for anchor positioning. This segmentation allows each component to perform its specific function independently, achieving enhanced lifting capacity without requiring a monolithic increase in anchor size or depth.
Solution Approach 2:
The support ring acts as an intermediary element between the concrete anchor and the surrounding concrete matrix. It mediates the stress transfer by redistributing lifting forces through its structured geometry, preventing direct concentration of forces that would otherwise require larger anchor dimensions to handle safely.
2Reliability
If the depth or size of concrete lifting anchors is increased to prevent concrete breakout or anchor rupture, then the lifting capacity and reliability are improved, but the fabrication time and processing are worsened
Solution Approach 1:
The support ring is pre-formed with its complete geometric configuration including inner wall, outer wall, upper lip, and lower lip structures. This preliminary preparation allows the ring to be installed as a ready-made component rather than requiring on-site construction of enlarged anchor structures, significantly reducing fabrication time while maintaining enhanced lifting capacity.
3Reliability
If the diameter of the support ring is increased to create a stronger breakout area, then the lifting capacity is improved, but the structural complexity and material usage are worsened
Solution Approach 1:
The support ring implements local quality enhancement by concentrating structural features where needed: the upper lip is positioned to redirect forces at the critical concrete-anchor interface, the lower lip is configured for optimal anchor engagement, and the wall thicknesses are varied to provide confinement where required while minimizing material usage in less critical areas.
Solution Approach 2:
The support ring utilizes controlled parameter variations including diameter limits (not exceeding six times the anchor height), specific wall thickness ratios, and lip projection dimensions. These parameter changes optimize the balance between creating a sufficient breakout area for enhanced lifting capacity and maintaining structural efficiency to avoid excessive complexity and material consumption.
Data Source
AI summary
An apparatus for strengthening a lifting anchor includes a ring configured to be disposed within concrete around a concrete anchor. The ring includes an inner wall facing the concrete anchor, an outer wall opposite to the inner wall, a lower lip protruding from the outer wall, and an upper lip protruding from the inner wall.