不同管径预制直埋保温管保温层摩擦力研究
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摘要
文中以胡克定律和材料热物理性质为出发点,利用经典力学和材料力学的分析方法,从理论上推导出保温层摩擦力的计算公式,并采用不同管径的预制保温管分冬夏两季进行实验验证。理论分析和实验结果表明:当管道受热伸长时,无保温钢管伸长量大于有保温钢管伸长量,即保温层对钢管有很大摩擦作用。若实验过程中假设钢管的弹性模量和钢材的弹性模量相等且为常数,则保温层摩擦力和无保温管与有保温管伸长量之差成正比;温差越大,无保温管与有保温管伸长量之差越大,则保温层摩擦力越大;保温层摩擦力在管道受热膨胀时,能很好地抵消热膨胀力,可以有效地限制管道沿轴向伸长,提高了供热直埋管道的安全性。
Hooke's law and thermal physical properties was used as a starting point,using analytical methods of classical mechanics and material mechanics theory formula for calculating the friction of the insulation layer and using different diameters of prefabricated pipe insulation in winter and summer experiment verification. Theoretical analysis and experimental results show that when the pipe thermal elongates,the no insulation tube elongation is longer than insulation pipe,it means that the insulation has great friction effect. The experiment is assumed that the elastic modulus of the steel pipe is equal and constant. The insulation layer friction is proportional to the difference between the length of the insulated pipe and the length of pipe without insulation. The more temperature difference is,the more difference between the length of the insulated pipe and the length of pipe without insulation is,and the more insulation friction is. Insulation friction when the pipe thermal expands can well counteract thermal expansion forces which can effectively restrict the pipeline along the axial elongation,thus improving safety of buried heating pipe.
Hooke's law and thermal physical properties was used as a starting point,using analytical methods of classical mechanics and material mechanics theory formula for calculating the friction of the insulation layer and using different diameters of prefabricated pipe insulation in winter and summer experiment verification. Theoretical analysis and experimental results show that when the pipe thermal elongates,the no insulation tube elongation is longer than insulation pipe,it means that the insulation has great friction effect. The experiment is assumed that the elastic modulus of the steel pipe is equal and constant. The insulation layer friction is proportional to the difference between the length of the insulated pipe and the length of pipe without insulation. The more temperature difference is,the more difference between the length of the insulated pipe and the length of pipe without insulation is,and the more insulation friction is. Insulation friction when the pipe thermal expands can well counteract thermal expansion forces which can effectively restrict the pipeline along the axial elongation,thus improving safety of buried heating pipe.
引文
[1]王飞,张建伟,王国伟,等.直埋供热管道工程设计[M].北京:中国建筑工业出版社,2014.
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[3]刘亚民.摩擦力与摩擦系数的几点性质[J].呼伦贝尔学院学报,2006(4):67-68.
[4]闫永波.谈供热直埋热水管道摩擦力的计算[J].山西建筑,2014(36):127-128.
[5]秦飞.材料力学[M].北京:科学出版社,2012.
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[10]刘杰,苏学英,王慧娟,等.聚乙烯材料与钛合金受热膨胀的对比研究.中国康复医学会第三次康复治疗学术大会论文汇编[C]∥中国康复医学会,北京,2002.
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[12] COADE. COADE Pipe Stress Analysis Seminar Notes[S].European Stress Agency,1993:3-10.
[13] ASME. ASME Code for Pressure Piping:Power Piping(ASME B31. 1)[S]. 1990:40-525.
[14] ASME. ASME Code for Pressure Piping:Pipe Flanges and Flanged Fittings(ASME B16. 5)[S]. 1993:7-45.
[15]徐良胜,王璞瑶,何贞朵,等.欧洲标准直埋供热管道应力计算方法[J].煤气与热力,2011(3):28-31.
[16] European Committee for Standardization. Design and installation of pre-insulated bonded pipe systems for district heating:EN13941:2009[S]. London:Standards Policy and Strategy Committee,2009.
[17]中华人民共和国住房和城乡建设部.城镇直埋供热管道工程技术规程:CJJ/T 81—2013[S].北京:中国建筑工业出版社,2013.
[18]胡月月,梁亚红,王西伟,等.一种供热管道微小位移测量装置:2015209687673[P]. 2016-04-13.
[2]国家质量监督检验检疫总局,国家标准化管理委员会.高密度聚乙烯外护管硬质聚氨酯泡沫塑料预制直埋保温管及管件:GB/T 29047—2012[S].北京:中国标准出版社,2012.
[3]刘亚民.摩擦力与摩擦系数的几点性质[J].呼伦贝尔学院学报,2006(4):67-68.
[4]闫永波.谈供热直埋热水管道摩擦力的计算[J].山西建筑,2014(36):127-128.
[5]秦飞.材料力学[M].北京:科学出版社,2012.
[6]丁发兴,余志武,温海林.高温后Q235钢材力学性能试验研究[J].建筑材料学报,2006(2):245-249.
[7]国家质量监督检验检疫总局,国家标准化管理委员会.低压流体输送用焊接钢管:GB/T 3091—2015[S].北京:中国标准出版社,2016.
[8] YANG R,HU W T,XU L,et al. Synthesis,mechanical properties and fire behaviors of rigid polyurethane foam with a reactive flame retardant containing phosphazene and phosphate[J]. Polymer Degradation and Stability,2015(12):102-109.
[9]朱吕民,刘益军.聚氨酯泡沫塑料[M].北京:化学工业出版社,2004.
[10]刘杰,苏学英,王慧娟,等.聚乙烯材料与钛合金受热膨胀的对比研究.中国康复医学会第三次康复治疗学术大会论文汇编[C]∥中国康复医学会,北京,2002.
[11] KANNAPPAN S. Introduction to pipe stress analysis[J].European Journal of Stress Research,1986(12):35-86.
[12] COADE. COADE Pipe Stress Analysis Seminar Notes[S].European Stress Agency,1993:3-10.
[13] ASME. ASME Code for Pressure Piping:Power Piping(ASME B31. 1)[S]. 1990:40-525.
[14] ASME. ASME Code for Pressure Piping:Pipe Flanges and Flanged Fittings(ASME B16. 5)[S]. 1993:7-45.
[15]徐良胜,王璞瑶,何贞朵,等.欧洲标准直埋供热管道应力计算方法[J].煤气与热力,2011(3):28-31.
[16] European Committee for Standardization. Design and installation of pre-insulated bonded pipe systems for district heating:EN13941:2009[S]. London:Standards Policy and Strategy Committee,2009.
[17]中华人民共和国住房和城乡建设部.城镇直埋供热管道工程技术规程:CJJ/T 81—2013[S].北京:中国建筑工业出版社,2013.
[18]胡月月,梁亚红,王西伟,等.一种供热管道微小位移测量装置:2015209687673[P]. 2016-04-13.