Sleeve is the key connector of grouting connection and the tangible carrier of grouting connection. Its main function is to transfer force (tension and repeated tension compression)
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Technical Principle: The reinforced sleeve grouting is connected with a metal sleeve inserted into the steel bar, and is poured with high-strength, early-strength, and micro-expandable cement-based grouting material. The rigid sleeve restrains the micro-expandable grouting material on the surface of the steel bar. A positive force is generated between the inner sides of the cylinder, and the steel bars generate friction on the rough, ribbed surface with the help of the positive force, so as to realize the stress transfer between the stressed steel bars.
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Grouting sleeve connection technology:
Sleeve can be divided into two types of full grouting sleeve and semi-grouting sleeve.
Full grouting sleeve and half grouting sleeve：
The full grouting sleeve means that both ends of the sleeve are inserted into steel bars and grouted to form an integral connection, which is mainly used for the connection of horizontal steel bars.
Full grouting sleeve：
Full grouting sleeve is used for horizontal steel bar connection:
Full grouting sleeve is used for the connection of beam longitudinal reinforcement：
Full grouting sleeve grouting connection：
Semi-grouting sleeve means that one end of the sleeve is screwed to the connecting steel bar, and the other end is inserted bar grouting connection, which is mainly used for the connection of longitudinal steel bars.
Semi-grouting sleeve connection：
Semi-grouting sleeve is used for the connection of longitudinally stressed steel bars of wall panels：
Prefabricated wall panel hoisting alignment sleeve：
Prefabricated column sleeve grouting：
Wallboard sleeve grouting：
Grouting connection of precast column longitudinal steel bar sleeve：
Sleeve grouting connection technology has been applied in Europe, America, Japan and other countries for more than 40 years. It has withstood the test of a major earthquake, formulated mature standards, and has been widely used. There is also a large amount of test data support in China, which is mainly used for vertical components such as columns and shear walls.
Compared with welding and straight thread mechanical connection, the advantage of sleeve grouting connection is that it reduces the pre-treatment workload of steel bars, prevents secondary stress and deformation of steel bars during on-site construction, and accepts larger construction deviations.
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