Anchor Device Support Plate Stress Distribution
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Solution Overview
Problem
Existing anchor devices for floating structures in rocky seabeds face issues where tensile stresses in anchor chains directly force mooring bolts out of boreholes, leading to instability and risk of bolt removal.
Innovation Solution
An anchor device design featuring a support plate with a connection point for the anchor chain shackle, which redirects tensile stresses away from the mooring bolt, allowing the force to be transmitted to the seabed, thereby reducing stress on the mooring bolt and preventing it from being pulled out of the borehole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the shackle is coupled directly to the mooring bolt, then the anchor chain can be securely attached, but the tensile stress directly forces the mooring bolt out of the borehole
Solution Approach 1:
The support plate serves as an intermediary element between the mooring bolt and the shackle. The shackle couples to the support plate rather than directly to the mooring bolt, and the support plate transfers the tensile stress to the seabed through its lower face. This intermediary structure protects the mooring bolt from direct tensile loading while maintaining secure attachment of the anchor chain.
2Reliability
If the mooring bolt is inserted into a borehole in rocky seabed, then anchoring is achieved, but the bolt is susceptible to being pulled out under tensile stress
Solution Approach 1:
The anchor device is segmented into distinct functional components: the mooring bolt for insertion into the borehole, the support plate for stress distribution, and the shackle for chain attachment. This segmentation allows each component to perform its specific function optimally - the bolt provides vertical anchoring while the support plate handles tensile stress distribution.
Solution Approach 2:
The support plate introduces a dimensional transition from vertical loading (bolt into borehole) to horizontal/stress distribution (plate on seabed surface). By distributing the tensile force across the area of the support plate's lower face, the stress is transformed from a concentrated vertical pull on the bolt to a distributed load on the seabed.
Data Source
AI summary
An anchor device for anchoring a floating structure to the seabed with an anchor chain having a shackle at one end of the chain. The anchor device includes a mooring bolt for being inserted into a borehole drilled in the seabed and a support plate having a lower face for resting on the seabed and an upper face with a through hole through which the mooring bolt passes through the support plate for being inserted into the borehole. The upper face of the support plate has a connection point for coupling the shackle of the end of the chain, such that when the floating structure is anchored to the seabed, the chain is subjected to tensile stresses causing a force to be applied at the connection point and not directly to the mooring bolt.