PROBLEM TO BE SOLVED: To provide a piping installation that can suppress attachment of crystals of liquid fertilizer to plants cultivated on a cultivation tray.SOLUTION: A piping installation that connects an upper-shelf cultivation tray and a lower-shelf cultivation tray in which liquid fertilizer flows comprises: a cup part 81 which is provided at a lower part of the upper-shelf cultivation tray and into which a liquid fertilizer discharge pipe 4f is inserted； and a pipe part 84 which extends below from the cup part 81 and is inserted into the lower-shelf cultivation tray. The cup part 81 comprises an outer cylindrical part 811 and an inner cylinder 85 which is housed inside the outer cylindrical part 811 and into which the liquid fertilizer discharge pipe 4f is inserted, and an upper edge part 85a of the inner cylinder 85 is positioned below an upper edge part 811a of the outer cylindrical part 811.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2020,JPO&INPIT【課題】栽培トレーで栽培されている植物に液肥の結晶が付着することを抑制することができる配管設備を提供する。【解決手段】配管設備は、それぞれ液肥が流れる上段の栽培トレーと下段の栽培トレーとを接続する配管設備であって、上段の栽培トレーの下部に設けられた液肥排出管４ｆが差し込まれるカップ部８１と、カップ部８１から下方に延び、下段の栽培トレー内に差し込まれるパイプ部８４と、を備え、カップ部８１は、外筒部８１１と、外筒部８１１内に収納され、液肥排出管４ｆが差し込まれる内筒８５を備え、内筒８５の上縁部８５ａは、外筒部８１１の上縁部８１１ａよりも下方に位置している。【選択図】図６
