手孔井的内围尺寸要求为500(长)×500(宽)×600(深)MM,用砾石铺层作为渗水用;手孔井四壁必须抹水泥沙浆。
Hand hole hole of the inner size for 500 (length) x 500 (width) x 600 (deep) MM, with gravel layer for water penetration;Hand hole walls must be well cement mortar.