PURPOSE: To provide easy installation and durability for using in a long time by fixing a pipe for a tuyere to a tuyere box and then feeding prepared unshaped refractory for forming the tuyere to a periphery of the pipe.

CONSTITUTION: A tuyere pipe 9 is engaged with a tuyere box, a corrugated fiberboard 14 having a predetermined thickness prepared by considering a thermal expansion of a prepared unshaped refractory is fixed among three tuyere pipes 9, powderlike unshaped refractory 15 which is added with water and satisfactorily kneaded is poured to a shape of the tuyere part partitioned by the fiberboard 14. In this case, lining refractory bricks 6 are previously laid on a periphery of the refractory 15 and a space is provided only at the tuyere refractory, and hence a framework for forming a pouring space is eliminated in the case of feeding. Since the tuyere refractory can be constituted only by pouring the unshaped refractory, an operation can be efficiently advanced.