The end trumpet and end triangle can be eliminated if a rolling process with three angles rotating is used for thick wallpipe rolling and other processes for thinwallpipe rolling.
采用三转角轧制法轧制厚壁管和相反的操作法轧制薄壁管可消除喇叭口与尾三角。
2
After illustrating the application of concrete thinwallpipe pile to the deep base pit support, the paper discusses its applications under different conditions and key construction techniques.
In this paper, the structure feature and principle of this special drill has been introduced. Its special design is very useful for drilling thin-wallpipe.