Anchor Rod Centering Assembly to Prevent Ring Displacement
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Solution Overview
Problem
Existing fastening arrangements face issues with axial displacement of centering rings during anchor rod insertion into anchor holes, leading to improper positioning and potential failure in anchoring within the hole.
Innovation Solution
A centering element with radially movable contact elements is designed to rest on the anchor hole's perforated wall, ensuring the anchor rod is accurately positioned and anchored, with a centering ring placed at an axial distance to prevent axial movement and ensure complete encasement by the hardening mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a centering ring is arranged on the anchor rod to center it in the anchor hole, then the anchor rod positioning is improved, but the centering ring may undergo axial displacement and be held back at the borehole mouth
Solution Approach 1:
The centering device is divided into two functional parts: a centering element at the front end with contact elements for initial centering, and a centering ring at a distance from the front end for stable positioning. This segmentation allows each component to perform its specific function optimally without interfering with the other.
Solution Approach 2:
The centering element with radially movable contact elements performs preliminary centering action at the borehole mouth before the centering ring enters the anchor hole. This preliminary action guides the anchor rod into correct position, preventing the centering ring from being held back at the borehole mouth.
2Manufacturing precision
If the centering ring is placed close to the front end for better positioning, then centering accuracy is improved, but the hardening mass cannot completely encase the anchor rod
Solution Approach 1:
By separating the centering function into a front-mounted centering element and a rear-mounted centering ring, the design allows the centering ring to be positioned at an optimal distance from the front end. This ensures both adequate centering accuracy and sufficient space for complete hardening mass encasement of the anchor rod.
Solution Approach 2:
The centering element acts as an intermediary that performs the critical centering function at the front end, allowing the centering ring to be positioned farther back. This intermediary role enables the centering ring to maintain accurate positioning while leaving adequate space for hardening mass encasement.
3Stability of the object's composition
If friction between the centering ring and hole wall is increased for better centering stability, then centering stability is improved, but axial displacement prevention becomes difficult
Solution Approach 1:
The centering function is separated into two stages: initial centering by the centering element with higher friction contact elements at the borehole mouth, and stable positioning by the centering ring with lower friction at a distance from the borehole mouth. This segmentation allows each component to have optimized friction characteristics for its specific function.
Solution Approach 2:
Different friction characteristics are applied at different locations: the centering element has higher friction for stable initial centering, while the centering ring has lower friction to prevent axial displacement. This local differentiation of friction properties optimizes both centering stability and axial displacement prevention.
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 solution effectively prevents axial displacement of the centering ring, ensuring the anchor rod is correctly aligned and securely anchored within the anchor hole, with a low friction interface allowing for complete encasement by the hardening mass, enhancing the anchoring process.
Implementation Method 1
the contact elements (11) are elastically supported radially inwards in the direction of the longitudinal axis (8)
Implementation Method 2
A fastening arrangement (1) for anchoring, i.e. for fastening an anchor rod (3) in an anchor hole (26) in an anchor base (27) with a hardening compound (28)
Data Source
Figure 1
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AI summary
To anchor an anchor rod (3) with mortar in an anchor hole, the invention proposes placing a centering element (4) on a front end (6) of the anchor rod (3). The centering element has contact elements (11) that project obliquely outwards over an imaginary cylinder (30) of a centering ring (5), which is placed on the anchor rod (3) at a distance from the centering element (4). The centering ring (5) has a smaller diameter than the anchor hole, so that it does not move on the anchor rod (3) when inserted into the anchor hole. A hole wall of the anchor hole elastically presses the obliquely projecting contact elements (11) inwards, thereby centering the front end of the anchor rod (3) in the anchor hole.