Dual-Support Rod Centering Insert for Coaxial Borehole Anchoring
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Solution Overview
Problem
Existing centering inserts for rods in boreholes often result in inaccurate centering and non-coaxial alignment due to one-sided support, leading to inefficiencies in adhesive distribution and connection strength.
Innovation Solution
An insert with an additional centering unit connected via a predetermined breaking point, allowing axial displacement and increased support distance between the sleeve body and centering unit, providing dual support points for precise coaxial alignment and a larger adhesive surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sleeve body with internal cavity is used to center the rod, then the rod can be axially fixed at the open end of the borehole, but the centering precision deteriorates due to one-sided support causing non-coaxial alignment
Solution Approach 1:
The centering function is segmented into two independent units: the sleeve body for axial fixing and the additional centering unit for precision centering. The additional centering unit is connected via a predetermined breaking point, allowing it to be separated and provide independent centering support at a different location, thus resolving the conflict between axial fixing and centering precision.
2Device complexity
If the rod is supported only near the open end of the borehole, then the insert structure is simple, but the adhesive surface area is reduced leading to weaker connection strength
Solution Approach 1:
The support points are distributed along the axial dimension of the borehole, with the sleeve body at one end and the additional centering unit at another location. This axial distribution increases the adhesive surface area between the rod and borehole wall, enhancing connection strength without significantly increasing structural complexity.
3Ease of manufacture
If the rod center axis is not aligned with the borehole center axis, then the insert is easier to manufacture, but the adhesive distribution becomes uneven reducing connection reliability
Solution Approach 1:
The additional centering unit acts as an intermediary element that provides a second centering reference point. This intermediary support ensures the rod's center axis aligns with the borehole's center axis, preventing uneven adhesive distribution and improving connection reliability while maintaining manufacturing simplicity.
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 easy handling and precise centering of rods within boreholes, achieving a highly resilient adhesive connection with a larger adhesive surface area between the rod and the borehole wall, enhancing the stability and strength of the bond.
Implementation Method 1
there is adhesive which serves to anchor the rod in the borehole
Data Source
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AI summary
The invention relates to an insert (10) for centering a rod (50) in a borehole (41) containing adhesive (60) which serves to anchor the rod (50) in the borehole (41), wherein the insert (10) has a sleeve body (11) with an inner cavity (15) for receiving the rod (50) and an outer surface (16), wherein in the operating position of the insert (10) the sleeve body (11) is axially fixed at an open end (42) of the borehole (41) and the outer surface (15) of the sleeve body (11) faces an inner wall (44) of the borehole (41).The invention is characterized in that an additional centering unit (12) is provided, which in an original state of the insert (10) is connected to the sleeve body (10) via at least one predetermined breaking point (13) and has a bearing surface for axial support of the rod (50), so that when the rod (50) is inserted into the borehole (41) and after the predetermined breaking point (13) has been separated, the centering unit (12) is moved axially with the rod (50), wherein an axial end (52) of the rod (50) is supported in a radial direction via the centering unit (11) on the inner wall (44) of the borehole (41).