1. 室(shi)外排水管(guan)道安裝要(yao)求

  室(shi)外排水(shui)(shui)(shui)管(guan)(guan)道(dao)起到(dao)排放污廢水(shui)(shui)(shui)與雨(yu)水(shui)(shui)(shui)的(de)作用(yong)，污廢水(shui)(shui)(shui)在(zai)管(guan)(guan)道(dao)中依靠(kao)重(zhong)力(li)作用(yong)由高處(chu)流向低處(chu)。因此，排水(shui)(shui)(shui)管(guan)(guan)道(dao)應有(you)一(yi)定(ding)的(de)下坡度。為了檢(jian)(jian)查及清通(tong)排水(shui)(shui)(shui)管(guan)(guan)道(dao)，在(zai)管(guan)(guan)徑改變(bian)處(chu)或(huo)管(guan)(guan)道(dao)坡度、支管(guan)(guan)接入處(chu)及管(guan)(guan)道(dao)轉彎處(chu)，都要(yao)設(she)廢水(shui)(shui)(shui)檢(jian)(jian)查井，直線(xian)段每隔一(yi)定(ding)距離也(ye)要(yao)設(she)污廢水(shui)(shui)(shui)檢(jian)(jian)查井，檢(jian)(jian)查井通(tong)常(chang)用(yong)磚砌(qi)筑(zhu)(zhu)。室(shi)外排水(shui)(shui)(shui)管(guan)(guan)道(dao)通(tong)常(chang)應與建(jian)筑(zhu)(zhu)物平(ping)行敷設(she)，距建(jian)筑(zhu)(zhu)外墻不應＜2.5m。

2. 室外排水管道施工(gong)流(liu)程

  室外排水(shui)管(guan)道一般(ban)直接(jie)(jie)埋在地下，其(qi)施(shi)工流(liu)程(cheng)是：施(shi)工準備→測量放線→開挖(wa)溝槽(cao)→基(ji)底處理→下管(guan)→穩管(guan)接(jie)(jie)口→檢查與(yu)(yu)砌筑→水(shui)試驗→回填土(tu)。其(qi)中下管(guan)及其(qi)前(qian)面的(de)項目，施(shi)工要求與(yu)(yu)室外給水(shui)管(guan)基(ji)本相同(tong)。

3. 室外排水管(guan)道的(de)管(guan)口與抹帶

  室(shi)外(wai)排水管(guan)道(dao)的管(guan)材，主要(yao)有(you)缸瓦管(guan)、混(hun)凝(ning)土管(guan)和鋼筋(jin)混(hun)凝(ning)土管(guan)。混(hun)凝(ning)土管(guan)和鋼筋(jin)混(hun)凝(ning)土管(guan)的管(guan)口形(xing)(xing)狀，主要(yao)有(you)承插口、平口和企口三種(zhong)，如圖(tu)2-50所示。其接口用(yong)水泥砂漿抹帶接口，常見的抹帶形(xing)(xing)式有(you)圓弧形(xing)(xing)和梯形(xing)(xing)兩種(zhong)，如圖(tu)2-51所示。

 特別提醒：室外排水(shui)(shui)管施(shi)工(gong)完畢，要(yao)按規(gui)定(ding)做閉水(shui)(shui)試(shi)驗。試(shi)驗時(shi)按規(gui)定(ding)施(shi)加一定(ding)的壓力，觀(guan)察接口處(chu)(chu)及整個管道(dao)滲水(shui)(shui)情況，如(ru)有(you)異常按規(gui)定(ding)處(chu)(chu)理(li)。