 Advanced technology, and high tensile strength. Spiral steel tie rod is adopted cold rolled technology manufacturing, which improve it tensile strength.  The whole tensile strength greatly, and process precision can make the formwork error margin within 2mm, thus cast the concrete wall thickness uniform.  After cast the concrete wall, only few parts was left in the wall, other parts, such as the spiral tie rod, the nuts and the waler plates are reusable 50 times above, thus reduces the construction cost.