Coated Anchor Rod Thread for Deep-Set Chemical Anchors
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Solution Overview
Problem
Existing expanding chemical anchor systems face challenges in achieving full load capacity due to incomplete expansion when the anchor rod's threaded portion is embedded within the mortar compound, preventing axial separation and load transmission.
Innovation Solution
An anchor rod design featuring a transition region with a sealed thread coated to prevent mortar penetration, allowing for easy activation even at maximum setting depth, using a wax coating that can be removed to expose the thread for full-length functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the anchor rod is introduced deep into the borehole to achieve variable setting depth, then the adaptability of the anchor system is improved, but the thread becomes embedded in mortar compound preventing activation
Solution Approach 1:
The anchor rod is divided into distinct functional zones: an anchoring region with threads for mortar engagement, a transition region with sealed threads for activation, and a connecting region for load application. This segmentation allows the thread to serve different purposes at different locations, enabling both deep setting and easy activation.
Solution Approach 2:
A coating is applied to the thread in the transition region to act as an intermediary barrier. This coating prevents mortar compound from penetrating and curing within the thread flights, thereby maintaining the thread's ability to rotate freely for activation purposes even when deeply embedded in the borehole.
2Ease of operation
If the thread is exposed to allow full-length functionality for fastening, then the ease of operation is improved, but the mortar compound penetrates and cures in the thread flights preventing activation
Solution Approach 1:
Different portions of the thread have different properties: the anchoring region has exposed threads for mortar engagement and load transfer, while the transition region has coated threads that remain free of mortar for activation. This local differentiation allows each section to perform its specific function optimally.
Solution Approach 2:
The coating serves as a temporary intermediary protection during installation, preventing mortar ingress in the transition region. After activation is complete, the coating can be removed to reveal the full thread functionality for fastening applications.
3Ease of operation
If the coating is removed to expose the thread for full functionality, then the ease of operation is improved, but the coating material is lost
Solution Approach 1:
The coating is designed as a temporary protective layer that is discarded after serving its purpose. Once the anchor rod is activated and the cones are separated from the mortar, the coating is removed to expose the thread for fastening operations. The coating material is sacrificed to enable the critical activation function.
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
Enables secure fastening and easy activation of the anchor rod by preventing mortar compound interaction with the thread, ensuring minimal load transmission to the cured mortar, thus facilitating complete expansion and load attainment.
Implementation Method 1
the thread is sealed with a coating in the transition region... the thread flights of the thread are evened out or covered by the coating in such a way that no mortar compound is able to penetrate into the thread turns
Data Source
AI summary
The invention relates to an anchor rod (10) for a chemical anchor system for use in a bore hole filled with mortar mass, which anchor rod has an anchoring region (12), which comprises the front end (16) of the anchor rod (10), and a connecting region (14), which has a thread (24) and, at the front end of the connecting region, a transition region (28), wherein the thread (24) is provided at least partially in the transition region (28) and is sealed with a coating (30) in the transition region (28).