Its special corrugations, high radial stiffness well adapted for use as void former in. The spiral seam is tight and no water from the concrete will enter the tube.
There are three corss sections as circular, flat and rectangular to meet different customers' demand.
Our steel duct is strictly producted according to JG225-2007. The material will be strictly test for tensile strength, surface quality , galvanized level etc. For the finished products, concentrated load, even load, vertical and bending impermealility will be tested.Every lot of products has one Quality Cerificate for our customer to make sure product qualified.
It is widlely used in post tensioning construction and civil engineering construction, such as apartment building, large span bridge, building trusses, and apartment buildings.