Fully grouted sleeves are critical components that ensure dependable rebar connections in prefabricated construction. Designed specifically for joining reinforcing bars between precast concrete members—including walls, columns, and beams—these sleeves function by injecting high-strength grout to securely anchor the two bars together, thereby forming an integral structural assembly.

All aspects of fully grouted sleeves are governed by rigorous national and industry standards. The primary reference documents are as follows:

Core Application Specification – Technical Specification for Grouting Sleeve Rebar Connections (JGJ 355). Partially revised in 2023, this specification serves as the authoritative guideline for design, construction procedures, and quality acceptance.

Sleeve Product Standard – Grouting Sleeves for Rebar Connections (JG/T 398). This standard defines the material composition, performance requirements, dimensional tolerances, and manufacturing processes applicable to the sleeves themselves.

Grouting Material Standard – Grouting Materials for Rebar Connections (JG/T 408). It establishes key performance criteria, including fluidity and compressive strength, to ensure the grout meets structural demands.

Latest National Standard Drawing Set – Technical Guidelines for the Application of Grouting Sleeve Rebar Connections (25G369). This updated drawing set, officially released in August 2025, provides comprehensive visual guidance and technical implementation instructions for engineering practice.