Segmented Anchor Bolt Expansion Ring for Higher Pull-Off Strength
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Solution Overview
Problem
Conventional anchor bolts with expansively openable pieces divided in the peripheral direction suffer from gaps when expanding, leading to insufficient pull-off strength due to non-contact areas with the anchor hole's inner wall.
Innovation Solution
An anchor bolt configuration featuring a bolt main body with a screw thread, a tubular member with locking pieces, an annular expansively openable member divided in the peripheral direction, and a push-in portion that expands the openable member radially outward, minimizing non-contact areas with the anchor hole's inner wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the anchor bolt uses multiple expansively openable pieces divided in the peripheral direction, then the structure can be simplified and easier to manufacture, but gaps are formed between the pieces when expanded, reducing pull-off strength
Solution Approach 1:
The expansively openable member is divided into multiple pieces in the peripheral direction to simplify manufacturing and assembly, while the pieces are designed to expand and contact the anchor hole inner wall to maintain pull-off strength
Solution Approach 2:
The inclination angle of the cone portion is optimized to control the expansion behavior of the expansively openable pieces, ensuring they expand sufficiently to contact the anchor hole inner wall and minimize gaps, thereby balancing manufacturing ease with pull-off strength
2Device complexity
If the expansively openable member is divided into multiple pieces, then the device complexity is reduced, but non-contact areas with the anchor hole inner wall increase, reducing holding capacity
Solution Approach 1:
The expansively openable member is segmented into multiple pieces to reduce device complexity and facilitate assembly, while the segmentation is designed to allow each piece to independently contact the anchor hole inner wall, maintaining reliability
Solution Approach 2:
The expansively openable pieces are designed to dynamically expand and adjust their position when the bolt is tightened, ensuring continuous contact with the anchor hole inner wall and minimizing non-contact areas, thereby maintaining holding capacity despite segmentation
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
This configuration enhances the pull-off strength of the anchor bolt by ensuring continuous contact between the expansively openable member and the anchor hole's inner wall, thereby improving the bolt's holding capacity.
Implementation Method 1
a push-in portion configured to expand the expansively openable member radially outward by being pushed into an inner hole of the expansively openable member
Data Source
AI summary
An anchor bolt (11) including: a taper bolt (21) that is, with a screw thread formed on an outer peripheral surface, inserted in an anchor hole (91); a sleeve (25) that is attached to the taper bolt (21) and includes locking pieces (252) that are, in a state of being disposed in the anchor hole (91), locked to an inner side surface of the anchor hole (91); an annular expansively openable ring (26) attached to the taper bolt (21) at a position closer to a tip side of the taper bolt (21) than the sleeve (25), and divided in a peripheral direction; and a cone portion (27) configured to expand the expansively openable ring (26) radially outward by being pushed into an inner hole of the expansively openable ring (26).