季节性冻土区衬塑钢管耐久性研究
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摘要
为探究季节性冻土区衬塑钢管在高低温冷热循环作用下使用的耐久性,基于现有规范,设计了温度区间为[-20,50]℃的高低温循环试验。采用PWS-E200电液伺服动静万能试验机和自主设计的结合强度试验装置测得经历不同高低温冷热循环次数后管道的结合强度和压扁强度,分析二者随循环次数增加的变化规律,并以此为依据分析该类管道的工程适用性。试验结果表明,管道的结合强度和压扁强度随高低温冷热循环次数的增加均降低,且管道的结合强度受影响较大,是该类管道耐温变性能的重要指标,并依据管道的压扁强度对其使用环境和埋置深度提出了建议。研究成果可为工程实践提供参考。
In order to explore the durability of lining plastic pipe under the effect of cycles of high and low temperature in seasonal frozen soil area,a high and low temperature cycle test with a temperature range of[-20℃,50℃]was designed based on the existing specifications.The PWS-E200 electro-hydraulic servo dynamic and static universal testing machine and independently designed bonding strength testing device were used to measure the bonding strength and flattening strength of the pipe after experiencing different high and low temperature cycles.The engineering applicability of the pipeline was analyzed based on the variation law of intensity with increasing number of cycles.The test results show that the bonding strength and flattening strength of the pipe are reduced with the increase of the number of high and low temperature cycles.The bonding strength of the pipe is affected greatly,and it is an important indicator of the temperature change resistance of the pipe.The reasonable suggestions for use environment and burried depth of the pipe are proposed based on the flattening strength.The research results can provide reference for engineering practices.
In order to explore the durability of lining plastic pipe under the effect of cycles of high and low temperature in seasonal frozen soil area,a high and low temperature cycle test with a temperature range of[-20℃,50℃]was designed based on the existing specifications.The PWS-E200 electro-hydraulic servo dynamic and static universal testing machine and independently designed bonding strength testing device were used to measure the bonding strength and flattening strength of the pipe after experiencing different high and low temperature cycles.The engineering applicability of the pipeline was analyzed based on the variation law of intensity with increasing number of cycles.The test results show that the bonding strength and flattening strength of the pipe are reduced with the increase of the number of high and low temperature cycles.The bonding strength of the pipe is affected greatly,and it is an important indicator of the temperature change resistance of the pipe.The reasonable suggestions for use environment and burried depth of the pipe are proposed based on the flattening strength.The research results can provide reference for engineering practices.
引文
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[4]GB/T 246-2017,金属材料管压扁试验方法[S].北京:中国标准出版社,2017.
[5]GB/T 5135.20-2010,自动喷水灭火系统第20部分:涂覆钢管[S].北京:中国标准出版社,2011.
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[2]刘辉义.钢塑复合管的性能特点及其在给水领域的应用[J].焊管,2004,27(3):36-38,91.
[3]GB/T 28897-2012,钢塑复合管[S].北京:中国标准出版社,2013.
[4]GB/T 246-2017,金属材料管压扁试验方法[S].北京:中国标准出版社,2017.
[5]GB/T 5135.20-2010,自动喷水灭火系统第20部分:涂覆钢管[S].北京:中国标准出版社,2011.
[6]杨伟芳,顾苏民,徐志茹.内衬PE钢塑复合管材耐低温性能试验[J].焊管,2011,34(7):27-30.
[7]陈光明,景海江.电子式万能试验机在涂层材料力学性能测试中的应用[J].四川兵工学报,2004,25(3):43-44.
[8]周伟,邱长军,何彬,等.高强度涂层结合性能的试验研究[J].南华大学学报:自然科学版,2005,19(2):23-25.
[9]GB56332-2002,给水排水工程管道结构设计规范[S].北京:中国建筑工业出版社,2002.
[10]于啸波.季节冻土动剪切模量阻尼比试验研究[D].哈尔滨:中国地震局工程力学研究所,2016.
[11]管岫峰.季节性冻土区市政给水管道合理埋置深度研究[D].石河子:石河子大学,2015.
[12]《工程地质手册》编委会.工程地质手册(第四版)[M].北京:中国建筑工业出版社,2007.