Anchor Rail Arrangement with Headless Edge Anchors
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Solution Overview
Problem
Anchor rail arrangements near the edge of concrete bodies face challenges with head bolts, which can create complex failure patterns and require large safety margins due to overlapping failure cones when subjected to tensile loads, making it difficult to predict and manage load capacity effectively.
Innovation Solution
The use of headless anchor rods instead of head bolts near the edge, which do not create appreciable failure cones and can be easily pulled out of the concrete, allowing for simplified force distribution and prediction of failure behavior, enabling reduced safety margins and standardized load capacity analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If head bolts are used as anchor bodies near the edge, then high pulling forces can be introduced into the concrete body, but overlapping failure cones occur when maximum load is exceeded, creating complex failure patterns and requiring large safety margins
Solution Approach 1:
The patent applies different anchor body types at different locations: head bolts are used for anchor bodies farther from the edge where they can develop full failure cone capacity, while headless anchor rods are used for anchor bodies closest to the edge where failure cone overlap would occur. This local differentiation resolves the contradiction by maintaining high strength where applicable while avoiding complex failure patterns near the edge.
2Reliability
If headless anchor rods are used instead of head bolts near the edge, then failure cone overlap is avoided and safety margins can be reduced, but the anchor bodies must be easily pulled out of concrete for installation
Solution Approach 1:
The headless anchor rods are pre-installed into the concrete body before the anchor rail is mounted. This preliminary action allows the anchor rods to be properly positioned and set in the concrete without the complexity of installing head bolts near the edge, while still achieving the desired reliability and predictable failure behavior.
3Device complexity
If anchor bodies closest to the edge are configured as headless anchor rods, then overlapping failure cones are avoided, but the anchor bodies need to be embedded in the concrete body without protruding heads
Solution Approach 1:
The patent segments the anchor bodies into two groups: those closest to the edge are configured as headless anchor rods that are embedded directly into the concrete, while other anchor bodies can be configured as head bolts. This segmentation allows the embedding process to be optimized for each type, with headless rods being simply inserted and set in the concrete without requiring head installation steps.
Data Source
AI summary
The invention relates to an anchor rail arrangement with a concrete body which has two end faces which extend at an angle to one another and meet at an outer edge, and with two anchor rails which are embedded in the concrete body, wherein the two anchor rails each have a rail body with a longitudinal slot, wherein the longitudinal slot of the first rail body emerges on the first end face and the longitudinal slot of the second rail body emerges on the second end face on the concrete body, and wherein the two longitudinal slots extend in a common rail plane, wherein the first anchor rail has a plurality of first anchor bodies arranged on the first rail body, namely a first anchor body closest to the edge and at least one further first anchor body, and wherein the second anchor rail has a plurality of second anchor bodies arranged on the second rail body, namely a second anchor body closest to the edge and at least one further second anchor body. According to the invention, the first anchor body closest to the edge is a headless anchor bar and the second anchor body closest to the edge likewise is a headless anchor bar.