Expansion Anchor Bullet Flange for Controlled Lamella Spreading
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Solution Overview
Problem
Existing self-undercut anchor systems experience uncontrollable spreading of lamellae, leading to overdrilling and reduced space for cement dust, necessitating a solution to prevent overexpansion and provide a stop point during anchor setting.
Innovation Solution
An expansion anchor system with a bullet featuring a radial flange that stops the spreading lamellae and includes slits for dust clearance, combined with a setting tool for controlled expansion and increased shear strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spreading lamellae are allowed to expand freely over the bullet, then the anchor can be set in the bore hole, but the lamellae spread uncontrollably deeper and too far into the preset depth
Solution Approach 1:
The radial flange is pre-formed on the bullet at a specific location before anchor installation. This preliminary structural feature automatically stops the lamellae spreading at the desired depth, preventing over-expansion without requiring additional control mechanisms during the setting process.
2Area of stationary object
If the lamellae spread deeper into the bore hole, then more surface area is available for anchor setting, but the space for cement dust is reduced
Solution Approach 1:
The radial flange is positioned on the bullet to pre-determine the optimal spreading depth, ensuring that lamellae expand sufficient surface area for anchor setting while automatically stopping before consuming excessive bore hole volume needed for cement dust accommodation.
3Ease of operation
If the anchor and bullet have extensive contact during setting, then the anchor can be properly positioned, but reduced contact is needed to prevent overexpansion
Solution Approach 1:
The radial flange creates a predetermined contact interface that allows sufficient anchor-bullet contact for proper positioning while simultaneously establishing a mechanical stop that prevents excessive expansion. The flange geometry is designed to provide just the right amount of contact area for positioning control.
Data Source
AI summary
The present disclosure provides a system to optimally set an anchor and a bullet within a pre-drilled bore hole. The anchor is comprised of at least two spreading lamellae, the spreading lamellae having a cutter to cut through cementitious material in the bore hole. The cutter comprises a tapered face to minimize contact with a bullet. In turn, the bullet is comprised of a radial flange to act as a stop for the spreading lamellae so that the anchor does not over drill deeper in the pre-drilled bore hole.