When it comes to securing rebar connection sleeve fasteners, there are four main methods that are commonly used: friction prevention, mechanical prevention, riveting prevention, and structural prevention.

Friction prevention is a widely used method that involves creating a constant pressure within the threaded joint, preventing it from loosening due to external forces. This pressure can be achieved by using methods such as elastic washers, rebar connection sleeves, self-locking nuts, and nylon insert lock nuts. While this method allows for easy disassembly of nuts, it may lead to loosening and failure of the threaded joint under impact, vibration, or varying loads over time.

Mechanical prevention involves directly limiting the relative rotation of the threaded joint using devices like cotter pins, wire ropes, and locking washers. While these devices do not provide pre-tension, they prevent loosening only when the nut reaches the locking position, thus preventing detachment rather than loosening.

Riveting prevention involves methods like riveting, welding, or adhesion after tightening the fasteners, transforming the threaded joint into a non-detachable connection. However, this method has limitations as the bolt can only be used once and disassembly is difficult, often resulting in the destruction of the bolted joint.

Structural prevention leverages the inherent structure of the threaded joint itself, such as the Tang Dynasty thread locking method, to prevent loosening effectively.

In conclusion, choosing the appropriate method to prevent rebar connection sleeve fasteners from loosening is crucial for ensuring the structural integrity and longevity of the construction project. Each method has its advantages and limitations, so it is essential to consider the specific requirements and conditions of the application.