To perform arrangement of a pipe having earthquake resistance even for a piping through which high capacity is fed by a method wherein a plurality of synthetic resin pipes are arranged in parallel and fluids in the synthetic resin pipes are intercommunicated in a position at a given pipe arrangement distance.

Polyethylene pipes 10 and 11 are arranged in juxtaposition vertically in a longitudinal direction through a pipe coupling 20 in a ditch dug in a ground. The pipe couplings 20 are arranged in juxtaposition two on each side of both sides with electric fusion connection part positioned on one side. Communication holes through which the connection parts are intercommunicated are formed in the respective central part 21 of coupling bodies and two electric fusion coupling tees are fused for connection at a branch pipe part to form a single pipe coupling 20. The polyethylene pipings 10 and 11 are arranged at intervals of a buried piping distance of approximate 5-20m. Further, for example, a saddle 23 is connected to, for example, the upper polyethylene piping 10 and when branch piping from the branch pipe part thereof to a target feed spot is effected, since the upper and lower polyethylene pipings 10 and 11 are intercommunicated through the pipe coupling 20 part, fluids at internal parts compensate for each other. The same effect as an effect that pipe arrangement is effected by using a single pipe having a bore larger than those of the polyethylene pipings 10 and 11 is produced.