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图片名称

PVC内衬预应力钢筒混凝土管

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  • 5.1(5).jpg
  • 5.2(4).jpg
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描述信息

PVC内衬预应力钢筒混凝土管是顶进施工法用钢筋混凝土管(PCCP)的技术改进产品,其内壁PVC防蚀片是以聚氯乙烯为主原料,配合其他改性辅料经过高温高压挤出成型。目前我们采用的PVC防蚀片是从台湾进口的产品,分为T型键和菱型键两种(如下图)。T型键结构形式适用于立式振动成型工艺和芯模振动成型工艺,菱型键结构形式适用于离心成型工艺和芯模振动成型工艺。主要应用于输送海水、城市污水、工业废水、强酸强碱等强腐蚀性介质。

 

LQ

 

LQ

 

PVC防蚀片一般为卷材,厚度要求不小于1.5mm,在台湾按标准《聚氯乙烯防蚀衬里片》CNS13781,K3112的要求进行生产及检测,在国内根据广东省标准《混凝土和钢筋混凝土内衬改性聚氯乙烯排水管道工程技术规范》DBJ15-53-2007进行检测。

PVC内衬预应力钢筒混凝土管在沿袭传统混凝土管的经济实用、安装方便、刚度好的基础上,还具有良好的防腐蚀作用和较小的水流阻力等特点。

 

改性PVC防蚀片物理功能

物理试验项目 试验方法 标准值
拉伸强度(纵、横键位方向) A.S.T.M.D.412 17.25MPa(minimum)
延伸率(断裂时实测) A.S.T.M.D.412 225%(minimum)
水溶性物质含量(24h) A.S.T.M.D.570 0.05%(minimum)
吸水率(75mm × 25mm, 24h) A.S.T.M.D.570 0.10%(minimum)
拉裂力度(纵、横键位方向) A.S.T.M.D.1004 80N/mm(minimum)
硬度(邵氏硬度) A.S.T.M.D.2240 54°~62°

 

 

改性PVC防蚀片化学功能

各种浓度化学药液 试验方法 重量变化率最大值
20%硫酸 A.S.T.M.D.543
(7d,20℃)
0.12%
5%氢氧化钠 0.20%
5%氨水 0.40%
1%硝酸 0.20%
1%氯化铁 0.60%
5%氯化铁 0.15%
1%次氯酸钠 0.20%
2%肥皂液和洗涤剂 0.40%

 

这里是占位文字

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