国产三级在线观看视频-国产三级在线免费-国产三级在线免费观看-国产三级自拍亚洲性爱在线-国产三级做爰在线播放-国产三級三級三級A片视频

排水用檢查井主要由井蓋、井蓋座、井筒、井室等部分組成。井筒及井室壁設置有供維修人員上下的踏步；井室體設置有進出水支管接口；污水井的井座一般設置有供水匯流的流槽，便于污物排放順暢；雨水井的井座一般設置有供管道中泥沙沉淀的沉泥室，方便后期清理維護。

Inspection well for drainage mainly consists of well cover, well cover seat, well bore, well chamber and other parts. The well bore and the wall of the well chamber are provided with steps for the maintenance personnel to go up and down; the well chamber body is provided with the inlet and outlet branch pipe interface; the well seat of the sewage well is generally provided with a flow channel for water supply confluence, so as to facilitate the smooth discharge of pollutants; the well seat of the rain well is generally provided with a mud chamber for sediment deposition in the pipeline, so as to facilitate the later cleaning and maintenance.