Reinforcing steel sleeves are generally used in various steel lap jointing methods in the construction industry. The sleeve connection has the advantages of environmental protection and energy saving, saving building materials, stable quality, and strong adaptability to engineering construction, and the development trend is rapid. In particular, the technology of rolling straight threaded steel bar connection has already become the key way of mechanical connection of steel bars. The processing technology adopts the cold rolling process to produce and process the top of the building steel bar into straight external threads, screw the two wires connecting the building steel bars into the steel bar sleeve, and complete the longitudinal steel bar after the sleeve specifications are in the middle of the relativity.

The components can be prefabricated in advance, without occupying the construction period, and the production and processing efficiency is high. The straight thread sleeve is convenient, convenient and simple to connect, and there is no electricity in the construction, and the construction can be carried out 24 hours a day. It can connect horizontal, vertical and oblique HRB335, HRB400 same-diameter or different-diameter building steel bars. The production, processing and installation quality of the connector shall comply with the current standards and relevant national industry standards and construction acceptance specifications. The sleeve specification requires a product certificate, and the appearance quality and thread standards should comply with the regulations. Estimates, micrometers and thread plug gauges are selected for testing.

Specifications of reinforced straight thread sleeves are:

National standard sleeve Φ16 40*24

National standard sleeve Φ18 45*27

National standard sleeve Φ20 50×31

National standard sleeve Φ22 54*33

National standard sleeve Φ25 60*37

National standard sleeve Φ28 67*41

National standard sleeve Φ32 75*47

National standard sleeve Φ36 84*53

National standard sleeve Φ40 85*58