We have a deep understanding of the appearance and use of U-shaped steel arch support, but we may have a little understanding of the material requirements of U tunnel roof support. Now let's make a deeper exploration of U-shaped support arch!
1. After the U-shaped steel arch support is cut, the end face shall be perpendicular to the center line of the longitudinal plane, and the perpendicularity deviation of the end face shall not be greater than 2mm.
2. After the U-shaped tunnel roof support is cut, the defects caused by cutting should be removed, such as flash, oxide, slag, etc.
3. After the U-shaped steel support arch is sheared and cut, there shall be no tearing at the shearing position. If there is tearing, repair welding and grinding shall be carried out.
4. After the U-shaped steel support arch is cut, the allowable deviation of its length is about 5mm.
