Introduction

The sleeve-type split sleeve is a new type of mechanical connection device for reinforcing bars based on the stripping and rolling straight thread connection technology. It consists of two axisymmetric semi-cylindrical sleeves and lock sleeves at both ends. The core design of this device is as follows:

1. Split structure: The inner wall of the semi-cylindrical sleeve is machined with precise straight threads, which tightly engage with the external threads of the reinforcing bar end; the outer conical surfaces of the sleeves at both ends are matched with the inner conical surfaces of the lock sleeves, and a double locking is achieved through axial tightening to ensure a stable connection that cannot be disengaged by itself.

2. Materials and process: It is manufactured from 45# high-quality carbon structural steel or alloy steel, and undergoes processes such as cold drawing, rolling, and heat treatment. The tensile strength is ≥ 600 MPa, and the yield strength is ≥ 355 MPa, meeting the requirements of JGJ 107-2016 "Technical Code for Mechanical Connection of Reinforcing Bars".

3. Working principle: The reinforcing bar end is rolled into straight threads on-site, and the two semi-cylindrical sleeves are clamped together and then screwed into the lock sleeves. The self-locking effect of the conical surfaces is utilized to achieve equal-strength connection of the reinforcing bars, without the need for welding or complex equipment.

Primary purpose

1. Construction Engineering: 

◦ Suitable for the connection of beams, columns, and foundation reinforcement in scenarios such as high-rise buildings, bridges, subways, and nuclear power plants. Especially suitable for the对接 of reinforcing cage, and the connection of prefabricated components with cast-in-place concrete in complex conditions. 

◦ Capable of connecting reinforcing bars of different diameters (diameter variation connection), or reinforcing bars fixed at the concrete， with high flexibility.

2. Special Environments： 

◦ Not affected by rain， snow， or low temperatures (-25°C to + 60°C)， can operate in humid or cold environments， and does not require open flames， ensuring high safety.

3. Seismic and Dynamic Load Structures： 

◦ Double sleeve design (such as products from Hengshui Andada) disperses stress through dual mechanical interlocking， with excellent fatigue performance， capable of withstanding more than 2 million repeated loads， suitable for dynamic load engineering such as bridges and rail transit.

4. Power Engineering： 

◦ In the cast-in-place pile foundation of ultra-high voltage lines， replaces the traditional welding process， solves the problem of long reinforcing cage and the difficulty of on-site welding， shortens the construction period and reduces the risk of hole collapse.