Adhesive Anchor Bolt Structure for Shallow Embedment Strength
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Solution Overview
Problem
Conventional adhesive anchors exhibit poorer construction performance and require deeper embedding depths to achieve substantial tensile strength, compared to metal expansion anchors, often resulting in mushroom-shaped superposed failures and bond failures between the adhesive and concrete.
Innovation Solution
An anchor bolt configuration with a head part, a shank part, and a sleeve part, where the sleeve part is secured by adhesive within the anchor hole, allowing the anchor bolt to exert a wedge effect and distribute tensile forces effectively, thereby achieving substantial tensile strength at a shallower embedding depth without directly contacting the adhesive, thus preventing mushroom-shaped superposed failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the embedding depth of adhesive anchor is increased to 10 times or more of anchor diameter, then substantial tensile strength is obtained, but construction performance deteriorates and embedding depth becomes excessively deep
Solution Approach 1:
The anchor bolt is divided into three distinct parts: head part, shank part, and sleeve part. The sleeve part (length: 0.5-2.0 times anchor diameter) is segmented from the shank part and positioned at the embedding portion, allowing it to be secured by adhesive while the shank part remains untouched by adhesive to maintain toughness. This segmentation enables substantial tensile strength at reduced embedding depths without requiring the conventional 10x diameter embedding depth.
2Ease of operation
If the embedding depth is reduced to five to eight times of anchor diameter, then construction performance improves, but mushroom-shaped superposed failure or bond failure occurs
Solution Approach 1:
Different parts of the anchor bolt are given different properties and functions: the sleeve part at the embedding location has adhesive-secured properties to prevent mushroom-shaped failure, while the shank part maintains its original toughness and is not contacted by adhesive. This local differentiation of properties allows the anchor to achieve reliable tensile strength at reduced embedding depths (5-8 times diameter) without the failures that occur in conventional designs.
3Strength
If the shank part directly contacts adhesive, then embedding strength improves, but toughness of the anchor bolt is impaired
Solution Approach 1:
The function of adhesive bonding is extracted and applied only to the sleeve part, while the shank part is excluded from adhesive contact. The sleeve part (length: 0.5-2.0 times anchor diameter) is positioned at the embedding portion and secured by adhesive, providing sufficient embedding strength. The shank part remains free of adhesive to maintain its toughness and ductility, solving the contradiction between embedding strength and material toughness.
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 configuration enables substantial tensile strength to be exerted at a shallower embedding depth than conventional adhesive anchors, improving construction performance and maintaining the toughness of the anchor bolt for structural support, while preventing failures at shallow positions.
Implementation Method 1
an outer peripheral surface of the sleeve part is secured by the adhesive to contribute to tensile strength
Implementation Method 2
the anchor bolt exerts a wedge effect on the fixed body at the head part
Data Source
AI summary
An anchor bolt for an adhesive anchor or the like that can be caused to exert substantial tensile strength at a relatively shallow embedding depth. An anchor bolt for an adhesive anchor that is fixed via adhesive to an anchor hole formed in a fixed body includes: a head part that is inserted into a hole back part of the anchor hole; a shank part that is continuous with the head part and formed to have a diameter smaller than the diameter of the head part; and a sleeve part into which the shank part is inserted, the sleeve part extending from an opening part to the hole back part of the anchor hole and having a tip end thereof abutted onto the head part.