The geometric dimensions and shapes of tunnel tubes are determined from the geometric shape and characteristics of the tunnel. Each tunnel is different, and each tunnel piece is different. The geometrical shape of the tube sheet mould depends entirely on the geometric shape of the concrete sheet. Different tunneling, different pieces of pipe, different pieces of pipe die. This requires that the designers of the pipe die manufacturers have rich experience, so that they can design the perfect targeted mold according to the different characteristics of each tunnel.