Construction procedures for coated steel pipes

(1) the coated steel pipe should not be buried in the reinforced concrete structure layer;

(2) welding is prohibited in the installation of coated steel pipes;

(3) the installation of coated steel pipes should be gradually connected from large diameters too small diameters, and the pipe openings should be blocked in time;

(4) during the transportation, loading and unloading, and construction of the coated steel pipe, throwing and violent impact are strictly prohibited;

(5) when the coated steel pipe is installed, the pipe bender can be used for cold bending when the pipe diameter is not greater than dn50, but the bending radius of curvature shall not be less than 8 times the pipe diameter, and the bending angle shall not be greater than 10°.