铁路预制梁预应力自动张拉伸长值测控技术研究

Research on Technology for Prestressed Automatic Tensioning Elongation Value Measurement and Control of Railway Precast Beam

钢束伸长值作为铁路预应力混凝土梁张拉施工质量的重要控制指标,其测量控制方法仍存在缺陷,采用传统测控方法得到的伸长值偏差及不同步率超出限值的情况普遍存在。本文在对现行铁路预应力混凝土预制梁张拉过程进行调研分析的基础上,对常规算法的计算误差进行了修正,对测量传感、液压分流和变频调速、云技术等多项关键技术进行了系统研究,结合规范和工程实践提出了更加科学精准的铁路桥梁预应力张拉伸长值测算和控制方法,并研发了与之配套的自动张拉系统,进行了与人工张拉的对比试验,验证了本文伸长值控制技术的有效性和可靠性。

The steel cable elongation value is an important control index for the tensioning construction quality of railway prestressed concrete beam,but its measurement and control method still has defects,and the situation that the deviation and asynchronization rate of the elongation value attained by traditional measurement and control method exceeds the limit value is common.Based on the investigation and analysis for tensioning process of the prestressed concrete precast beam,this paper has corrected the error of the conventional calculation method and systematically studied the key technologies of measurement and sensing,hydraulic diversion and frequency conversion speed regulation,and cloud technology.In combination with specifications and engineerng practice,this paper has put forward more scientific and precise methods for measurement and control of prestressed tensile elongation value of railway brdge,and has developed the auxiliary automatic tensioning system and verified the validity and reliability of elongation value control technology by comparson test with manual tensioning.