Expansion Anchor Swelling Element for High Holding Force
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Solution Overview
Problem
Existing expansion anchors face a compromise between achieving high holding forces and ease of installation, as larger elevations on the expansion sleeve make it difficult to hammer the anchor into place while providing sufficient holding force.
Innovation Solution
Incorporating a swellable compound that swells inside the drilled hole, increasing friction between the expansion element and the hole wall, allowing for high holding forces without requiring high hammering forces, and using a slanted surface on the stud to radially expand the expansion element for secure anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger elevations are provided on the expansion sleeve to increase holding force, then the holding force is improved, but the anchor becomes difficult to hammer into the drilled hole
Solution Approach 1:
The swelling element is activated after the expansion anchor has been hammered into the drilled hole, performing the holding force function in advance preparation. The swellable compound remains inactive during installation and only activates afterward, allowing easy hammering while still achieving high holding forces through subsequent swelling action.
Solution Approach 2:
The swelling element changes its volume parameter after installation by absorbing liquid and swelling up. This parameter change occurs after the anchor is installed, transforming the anchor from a easily-installed state to a high-holding-force state, thereby resolving the contradiction between ease of installation and holding force.
2Strength
If a high coefficient of friction is used between the expansion element and the stud to achieve high pull-out loads, then the pull-out load capacity is improved, but the expansion element may move axially during installation
Solution Approach 1:
The swelling element secures the expansion element axially before the high-friction interaction occurs during expansion. By activating the swelling element first to prevent axial movement, the system ensures stable positioning before applying the high friction coefficient, thereby achieving both axial stability and high pull-out capacity.
Solution Approach 2:
The swelling element acts as an intermediary between the expansion element and the drilled hole wall. It provides the axial securing function that allows the expansion element to remain stationary during installation, enabling the use of high friction coefficients without causing axial movement issues.
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 enables high holding forces to be achieved with minimal installation effort, ensuring reliable anchoring even in cracked concrete, while allowing for easy hammering in and high pull-out loads without axial movement during installation.
Implementation Method 1
at least one swelling element consisting of a swellable compound that can swell in order to secure the expansion element onto the wall of a drilled hole
Implementation Method 2
the stud has a slanted surface that pushes the expansion element on the stud radially outwards when the stud is moved in a pull-out direction relative to the expansion element
Data Source
AI summary
An expansion anchor including a stud and at least one expansion element arranged on the stud, whereby the stud has a slanted surface that pushes the expansion element radially outwards when the stud is moved in a pull-out direction, relative to the expansion element is provided. It is provided that the expansion anchor has at least one swelling element consisting of a swellable compound that can swell in order to secure the expansion element onto the wall of a drilled hole in the pull-out direction.