Grouted Connections

Grouting connection is the core connection technology for offshore wind power foundations. By injecting high-strength grouting material into the annular gaps between the foundation pile and the transition section, as well as between the casing and the main leg, combined with the steel structure anchoring structure, a rigid composite connection node is formed. This achieves the core functions of load transmission, structural fixation, and vibration and seepage prevention. 

Application scenario

It is widely used in the connection of single pile foundations and transition sections, as well as in the connection between jacket pile sleeves and pile foundations; it is applicable to deep-sea wind power projects with extremely high requirements for connection stiffness, anti-slip, and anti-fatigue; it is suitable for complex marine conditions such as low temperatures, high corrosion, and high wave loads. 

Main structure

It consists of an inner and outer double-layer steel casing structure, a ring-shaped grouting gap, anchoring pins, shear sockets, grouting ports, exhaust ports, and sealing structures; the steel structure surface is equipped with anti-slip and shear-resistant features, which, in combination with high-strength grouting material, form an overall composite force-bearing node, possessing high strength, high rigidity, anti-slip property, and fatigue resistance characteristics. 

Corresponding product standards

- DNV-ST-0119 "Design Specifications for Grouting Connections in Offshore Wind Power"

- ISO 19901-8 "Requirements for Grouting Connections of Offshore Structures"

- GB/T 50448 "Technical Specifications for Application of Cement-Based Grouting Materials"

- API RP 2G "Construction Specifications for Grouting Connections in Offshore"

- NORSOK M-501 "Standards for Connection Nodes of Offshore Structures"