In the construction industry, traditional steel bar connection methods such as lap joint, welding and other connection methods cannot meet the needs of the rapid development of the construction industry in terms of connection quality, efficiency and operability. The continuous update of the steel connecting sleeve technology has led to further innovation and technological progress in the entire industry. Therefore, the steel bar connection technology is quite successful in a certain sense, and has its own characteristics, so as to adapt to the constantly developing industry and social trends.
The lap joint connection method can no longer be used for the connection of large-sized steel bars, and there are many shortcomings in welding, (such as unstable steel material, poor weldability, etc.; unstable power supply or poor welder level; construction period Insufficient electric capacity; and weather effects such as wind, rain and cold; construction plans for places with high fire protection requirements; quality and speed of on-site connection of horizontal steel bars.) Welding quality cannot be guaranteed. The mechanical connection of steel bars can avoid the above difficulties and show obvious advantages. In the late 1980s, through the introduction of foreign advanced mechanical connection technology, coupled with the continuous efforts of relevant experts from some scientific research institutes in my country, my country's steel mechanical connection technology developed rapidly. The mechanical connection has gone through different development stages such as sleeve cold extrusion, tapered thread, upsetting straight thread until the current rolling straight thread.
The advantages of the new steel connecting sleeve are as follows:
1. Not affected by the chemical composition of steel bars, human factors, climate, electricity and many other factors;
2. Non-polluting, in line with environmental protection requirements, safe and reliable operation without open flames;
3. Wide range of application, suitable for connection of various orientations and the same and different diameter steel bars;
4. High strength, stable and reliable quality;
5. Simple operation and fast construction speed.
