METHOD FOR INSTALLING FIRE-RESISTANT PIPING BOX

PROBLEM TO BE SOLVED: To provide an installation method that facilitates construction work and can save labor for an on-site fire inspection.SOLUTION: After an opening 11 is formed in a permanent form 1, an installation form 3 that surrounds the opening is placed and a floor slab 4 is placed outside of the installation form. Then, a lower box body 51 with a fire-resistant coating, which is provided with a fire-resistant coating 51b on its bottom face and side faces, is housed inside of the installation form 3, and then, the first flange 51c provided to the lower box body with the fire-resistant coating is firmly mounted to a second flange 31 provided to the installation form. A plurality of pieces of piping 7 covered with a fire-resistant coating material 71 are connected. Therefore, the opening 11 can be formed more promptly, easily and accurately by cutting the permanent form 1. In addition, employing the aforementioned installation structure allows fire-resistance evaluation to be obtained in advance, which can save the labor and cost of executing a fire inspection every time at each job site.