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l排水uPVC管的选用不当问题1.1排水UPVC管应根据不同场合、用途、工作条件而选用不同品种的UPVC管，表1给出UPVC管的一般选用原则。表1UPVC管的一般选用原则I.2安装工程中往往由于建设单位(业主)的不适当干预、设计图纸不明确、施工单位对排水UPVC管特性了解不足等因素引起选用不当问题，表2给出常见的几种选用不当问题，供同行参考。表2IJPVC管选用常见问题1-3建议按照表1所列原则进行管材和管件的选用，防止出现表2中出现的问题。PVC排水管的伸缩考虑不当问题2.1UPVC制品的线膨胀系数较大，管道受环境湍度和污水温度变化引起的伸缩长度，可按下式计算：L=Lt式中：L～管道温伸长度(m)t一温筹(℃)L一管道长度(m)Q一线膨胀系数，采用7×1一m／m~C。我们计算3m长管道在At=5℃时的温伸K度为1.5mm，那么这1.5mm的伸长或收缩就必须考虑用伸缩节等专用配件来解决，尤其在我国北方地区，环境温差较大，管道伸缩问题必须考虑，不然就有拉坏或胀坏、弯管的lIf能。2粘接接头的UPVC管道伸缩问题于普通UPVC排水管或芯层发泡UPVC排水管的粘接接头，属刚性连接，必须依靠伸缩这个专用配件来解决管道的伸缩问题，但在实际安装过程中常常出现以下三类问题：外墙敷设的雨水管和空调冷凝水管未殴萱伸缩节关于伸缩节的设置位置和安装方法，《建筑排水硬聚氯乙烯管道安装技术规程》(CJJ／T29—98)(以_F简称技术规程)中有明确的规定，这里不再赘述。实际安装时，往往在室内排水管安装中对“技术规程”贯彻的较好，而忽视r沿外墙敷设的雨水管和空调冷凝水管，而这两种管道不设伸缩节会造成管道拉坏、胀坏、管、管卡歪扭、破坏建筑外立面美观等问题，闪此一定要按照“技术规程”的要求进行设置。
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