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l排水uPVC管的選用不當(dāng)問題1.1排水UPVC管應(yīng)根據(jù)不同場合、用途、工作條件而選用不同品種的UPVC管,表1給出UPVC管的一般選用原則。表1UPVC管的一般選用原則I.2安裝工程中往往由于建設(shè)單位(業(yè)主)的不適當(dāng)干預(yù)、設(shè)計圖紙不明確、施工單位對排水UPVC管特性了解不足等因素引起選用不當(dāng)問題,表2給出常見的幾種選用不當(dāng)問題,供同行參考。表2IJPVC管選用常見問題1-3建議按照表1所列原則進(jìn)行管材和管件的選用,防止出現(xiàn)表2中出現(xiàn)的問題。PVC排水管的伸縮考慮不當(dāng)問題2.1UPVC制品的線膨脹系數(shù)較大,管道受環(huán)境湍度和污水溫度變化引起的伸縮長度,可按下式計算:L=Lt式中:L~管道溫伸長度(m)t一溫籌(℃)L一管道長度(m)Q一線膨脹系數(shù),采用7×1一m/m~C。我們計算3m長管道在At=5℃時的溫伸K度為1.5mm,那么這1.5mm的伸長或收縮就必須考慮用伸縮節(jié)等專用配件來解決,尤其在我國北方地區(qū),環(huán)境溫差較大,管道伸縮問題必須考慮,不然就有拉壞或脹壞、彎管的lIf能。2粘接接頭的UPVC管道伸縮問題于普通UPVC排水管或芯層發(fā)泡UPVC排水管的粘接接頭,屬剛性連接,必須依靠伸縮這個專用配件來解決管道的伸縮問題,但在實際安裝過程中常常出現(xiàn)以下三類問題:外墻敷設(shè)的雨水管和空調(diào)冷凝水管未毆萱伸縮節(jié)關(guān)于伸縮節(jié)的設(shè)置位置和安裝方法,《建筑排水硬聚氯乙烯管道安裝技術(shù)規(guī)程》(CJJ/T29—98)(以_F簡稱技術(shù)規(guī)程)中有明確的規(guī)定,這里不再贅述。實際安裝時,往往在室內(nèi)排水管安裝中對“技術(shù)規(guī)程”貫徹的較好,而忽視r沿外墻敷設(shè)的雨水管和空調(diào)冷凝水管,而這兩種管道不設(shè)伸縮節(jié)會造成管道拉壞、脹壞、管、管卡歪扭、破壞建筑外立面美觀等問題,閃此一定要按照“技術(shù)規(guī)程”的要求進(jìn)行設(shè)置。

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