Prestressing Bar Anchor With Deployable Wings for Misalignment Grip
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Solution Overview
Problem
Conventional anchoring systems for prestressing bars in concrete structures face limitations due to misalignment issues and insufficient grip, leading to compromised anchoring capacity and difficulty in extracting the anchor without removing significant concrete volume.
Innovation Solution
An anchoring device with articulated wings that deploy radially, utilizing a wedging mechanism and filling material to secure the prestressing bar, ensuring robust mechanical coupling and resistance to tensile forces without requiring modification or degradation of the anchor configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anchoring systems use sliding systems between male and female cones or rotation of a camshaft, then the anchoring device can be deployed, but the anchoring capacity is limited and misalignment compromises the anchoring
Solution Approach 1:
The anchoring device uses articulated wings that can dynamically change their configuration from a retracted state during insertion to a deployed state for anchoring. The wings are hinged to the base and can rotate outward when actuated by the wedging member, transforming the device from a compact insertion form to an expanded anchoring form, thereby improving reliability without requiring complex alignment procedures
Solution Approach 2:
The anchoring device is segmented into multiple independent articulated wings that can deploy individually or collectively. Each wing is a separate component hinged to the base, allowing modular deployment and reducing the complexity of the overall system while maintaining high anchoring capacity through the cumulative effect of multiple wings
2Ease of operation
If the expansion piece has thin sections to enable fin deployment, then the fins can deploy radially, but the resistance to tensile forces is reduced
Solution Approach 1:
The wings are designed with articulated hinges that allow them to deploy dynamically when actuated by the wedging member. The wings maintain their structural integrity during deployment because the articulation points are designed to accommodate the deployment motion while preserving load-bearing capacity, thus achieving both ease of deployment and tensile strength
Solution Approach 2:
The wings are pre-configured in a retracted position during insertion, and the deployment action is initiated only when the wedging member is actuated. This preliminary positioning ensures that the wings are ready for deployment without requiring thin sections, as the deployment is triggered at the optimal moment when the anchor is properly positioned in the concrete
3Strength
If the anchoring device uses articulated wings that deploy radially, then the mechanical strength is enhanced, but the device complexity increases
Solution Approach 1:
The articulated wings provide enhanced mechanical strength through their radial deployment configuration, which distributes loads across multiple wings. The complexity is managed by using simple hinge connections and a wedging mechanism that actuates all wings simultaneously, transforming the device from a simple insertion form to a strong anchoring form without requiring complex control systems
Solution Approach 2:
Multiple articulated wings are merged into a single integrated anchoring system that shares a common base and actuation mechanism. The wings work together to provide enhanced mechanical strength, while the common actuation system (wedging member) reduces the overall complexity by providing unified control rather than requiring separate actuation mechanisms for each wing
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 anchoring device provides enhanced mechanical strength, simplifies the anchoring process, and allows for fine adjustments to suit specific conditions, offering superior anchoring performance and reduced risk of structural degradation.
Implementation Method 1
a filling material (18) hardenable, in which the anchoring device (10) is intended to be mechanically coupled to the structure (6)
Implementation Method 2
a wedging member (24) arranged on the bar (8) so as to be movable there to cause the wings (28) to deploy
Implementation Method 3
The anchoring device provides enhanced mechanical strength, simplifies the anchoring process, and allows for fine adjustments to suit specific conditions
Data Source
Figure 1
Figure 2~7
Figure 3a~4b
AI summary
The anchoring device is adapted for anchoring to a structure an element to be anchored (8) having a distal side and a proximal side. It comprises: at least one anchoring stage (22) including an end stage (22E) towards the distal side, each anchoring stage comprising a base (26) and at least one anchoring element (28) hinged on the base to be movable between a folded position and a deployed position radially relative to the element to be anchored; and a clamping member (24) movable along the element to be anchored towards the distal side so as to cause the displacement of the anchoring element(s) from the folded position to the deployed position. The base (26) of the end stage (22E) is coupled to the anchoring element (8) so as to be prevented from moving towards the distal side during the movement of the clamping member (24) which causes the deployment of the anchoring element(s) (28).