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为了有效应用拉脱法测试技术测试预应力钢绞线锚下有效预应力,该文首先介绍了拉脱法的测试原理,研发了拉脱法的测试设备。测试设备由高频数据采集卡、油压传感器、高精度位移计及电动油泵组成。基于图形化软件平台LabVIEW,采用图形化设计语言G语言编制了测试程序,给出程序源代码。基于研究的软件和测试硬件,集成了拉脱法锚下有效预应力测试仪器(LTF 1.0)。基于测试仪器,开展了工程推广应用。研究结果表明:研究的测试仪器能够通过张拉力-延伸量曲线,有效地识别锚下有效预应力的大小;测试仪器(LTF1.0)具有精度高、安全性好及操作简便等优点;通过现场工程应用,现场检测的预应力钢绞线锚下有效张拉力合格率从54.4%提升至94.7%,同束离散度从10.2%降至1.7%。
In order to effectively apply the pull-off test technique to test the effective pre-stress of prestressed strand anchors, this paper firstly introduces the test principle of pull-off method and develops the test equipment of pull-off method. Test equipment by the high-frequency data acquisition card, hydraulic sensors, high-precision displacement meter and electric pump composition. Based on the graphical software platform LabVIEW, a graphical programming language G language was used to prepare the test program and the program source code was given. Based on the research software and test hardware, the Lattice Anchorage Effective Prestressing Instrumentation (LTF 1.0) is integrated. Based on test equipment, launched a project to promote the application. The results show that the test instrument can effectively identify the effective prestressing force through the tension-extension curve. The test instrument (LTF1.0) has the advantages of high precision, good safety and easy operation. Engineering application, on-site testing of prestressed strand anchors effective tension under the pass rate increased from 54.4% to 94.7%, with beam dispersion from 10.2% to 1.7%.