Problem to be solved: to provide a sprinkler system supplied from a ground water supply pipe.Solution: the upper water pipe C2 is screwed into the lower water pipe C1 branched upward from the underground water supply pipe D, the riser tube a is connected to the upper end of the upper water pipe C2, and the water pipes C1 and C2 are divided into two parts in the upper and lower stages so that the water pipes C1 and C2 are encapsulated in the split surface, and are enclosed by the riser block. A concave portion B23 is provided on the partition surface of the riser block, and a stop preventing projection C24 for retaining the upper water pipe C2 is formed in the recess.Diagram【課題】地中給水管から給水されるスプリンクラー設備を提供する。【解決手段】地中給水管Ｄから上方に分岐した下部水管Ｃ１に上部水管Ｃ２を螺合し、更に上部水管Ｃ２の上端にライザー管Ａを螺合して接続するとともに前記水管Ｃ１、Ｃ２を分割面で包被するように上下２段で左右に分割され、ライザーブロックで囲い、ライザーブロックの分割面に凹所Ｂ２３を設け、又上部水管Ｃ２に凹所と係止する廻り止め突起Ｃ２４を設ける。【選択図】図１０
