To eliminate the need of performing thread cutting work and preparing a power source at a construction site, to eliminate the need of incorporating a heater in a joint and to easily perform connecting construction in a short time at a low cost, in the piping of fire extinguishing equipment using a resin pipe.

Since a helical groove is provided over the entire length of the outer periphery of the resin pipe, at the construction site of the fire extinguishing equipment, just by cutting the resin pipe to a prescribed length, applying an adhesive material to the end part and screwing it to the joint, connection is surely performed.