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In tunnel construction, there is a machine called shield machine, which is used for starting and tunneling, and has the functions of digging and cutting soil, conveying soil ballast, assembling tunnel lining and so on. However, when lining the tunnel, the shield machine is assembled by several segments. A screw has the function of connecting and fastening, and the section is a cylindrical wall. During excavation, the ground settlement can be effectively controlled, and the impact on the ground buildings can be reduced, and the water traffic will not be affected during underwater excavation. These segments are combined together to form a pipe. This kind of fastening connector designed in a straight line or with a certain curvature is a segmented bolt. Segmented bolts are divided into circumferential bolts and longitudinal bolts. Some designs have the same circumferential and longitudinal specifications. Some designs use both circumferential and longitudinal specifications, or even two strength grades. Generally speaking, the length of circumferential segmented bolts is longer than that of longitudinal segmented bolts.