To enable initial fire fighting and to attain the reduction of facility costs.

This fire-fighting facility has a batch opening valve 5 to connect piping 15 for sensing provided with a sensing head 17 and piping 3 for fire- fighting provided with a fire-fighting head 6. In this case, the piping 15 for sensing head is filled with compressed air and the primary side of the batch opening valve 5 is filled with water. Thus, since a solution for fire-fighting can be immediately discharged from the fire-fighting head when a fire occurs, initial fire fighting is enabled. Since it is enough to arrange one air compressor only over the piping for sensing and any accelerator is not required, remarkable cost-down is enabled.