Abstract：
During construction of 4000 m3 blast furnace, innovative construction techniques are created to realize effective control on sampling before opening hole, diameter of plane hole, central point of hole, hole opening angle and hole opening mode, etc. Plane hole opening technique and central roller fabrication method are adopted together with key construction processes, such as preparation of blast furnace shell materials, hole opening in plant, rolling and pre-assembly, etc., to successfully improve the hole opening accuracy and construction efficiency and to realize completely automatic operation.
