1. 室外排水(shui)管道安裝要求

  室外(wai)排(pai)(pai)(pai)(pai)水(shui)(shui)管(guan)(guan)道(dao)(dao)(dao)起到排(pai)(pai)(pai)(pai)放污(wu)廢(fei)水(shui)(shui)與雨水(shui)(shui)的(de)作(zuo)用(yong)(yong)，污(wu)廢(fei)水(shui)(shui)在管(guan)(guan)道(dao)(dao)(dao)中依靠重(zhong)力(li)作(zuo)用(yong)(yong)由高(gao)處(chu)流向低處(chu)。因此，排(pai)(pai)(pai)(pai)水(shui)(shui)管(guan)(guan)道(dao)(dao)(dao)應(ying)有一定(ding)的(de)下坡度(du)。為了檢(jian)查(cha)及(ji)清通(tong)(tong)排(pai)(pai)(pai)(pai)水(shui)(shui)管(guan)(guan)道(dao)(dao)(dao)，在管(guan)(guan)徑改變處(chu)或管(guan)(guan)道(dao)(dao)(dao)坡度(du)、支管(guan)(guan)接入(ru)處(chu)及(ji)管(guan)(guan)道(dao)(dao)(dao)轉(zhuan)彎處(chu)，都要設廢(fei)水(shui)(shui)檢(jian)查(cha)井(jing)，直線段每(mei)隔一定(ding)距離也要設污(wu)廢(fei)水(shui)(shui)檢(jian)查(cha)井(jing)，檢(jian)查(cha)井(jing)通(tong)(tong)常用(yong)(yong)磚砌筑。室外(wai)排(pai)(pai)(pai)(pai)水(shui)(shui)管(guan)(guan)道(dao)(dao)(dao)通(tong)(tong)常應(ying)與建筑物平行敷(fu)設，距建筑外(wai)墻不應(ying)＜2.5m。

2. 室外排水管道施工流程

  室(shi)(shi)外(wai)排水管(guan)道一般直接埋在地下(xia)，其施(shi)工(gong)流程(cheng)是：施(shi)工(gong)準備→測量放線→開挖(wa)溝(gou)槽→基底(di)處理→下(xia)管(guan)→穩(wen)管(guan)接口→檢(jian)查與砌筑(zhu)→水試(shi)驗→回填(tian)土。其中(zhong)下(xia)管(guan)及其前面(mian)的項目(mu)，施(shi)工(gong)要求與室(shi)(shi)外(wai)給水管(guan)基本相同(tong)。

3. 室外排水管(guan)(guan)道的管(guan)(guan)口(kou)與(yu)抹帶(dai)

  室外(wai)排水(shui)管(guan)(guan)道的管(guan)(guan)材，主要有(you)缸瓦管(guan)(guan)、混凝(ning)土管(guan)(guan)和(he)(he)鋼(gang)筋(jin)混凝(ning)土管(guan)(guan)。混凝(ning)土管(guan)(guan)和(he)(he)鋼(gang)筋(jin)混凝(ning)土管(guan)(guan)的管(guan)(guan)口形(xing)狀，主要有(you)承插口、平口和(he)(he)企口三種，如圖2-50所(suo)示。其接口用水(shui)泥砂漿(jiang)抹帶接口，常見的抹帶形(xing)式(shi)有(you)圓(yuan)弧形(xing)和(he)(he)梯(ti)形(xing)兩種，如圖2-51所(suo)示。

 特別提醒：室外排水(shui)(shui)管施工完畢，要按(an)規定(ding)(ding)做(zuo)閉(bi)水(shui)(shui)試驗(yan)。試驗(yan)時(shi)按(an)規定(ding)(ding)施加一定(ding)(ding)的壓力，觀(guan)察接(jie)口處及整(zheng)個管道滲水(shui)(shui)情況，如有異常按(an)規定(ding)(ding)處理(li)。