高速铁路线下工程沉降差压式精密测量系统

为精确获取高速铁路基础结构沉降变形信息,提出了差压式沉降测量方法,以静止流体欧拉平衡微分方程为基础,讨论了测量基本原理,通过差压处理及对流体密度进行温度修正解决了温度变化引入测量系统误差的问题,对传感器量程、热漂移特性等关键技术参数进行了分析,设计集成了沉降自动化精密测量系统HSMS-1.对高速铁路某线桥梁基础沉降的实测结果表明: HSMS-1在-18~42 ℃环境温度内与电子水准仪测值一致,最大偏差仅为0.44 mm, 300 mm量程沉降测量系统测试准确度可达0.2级,适用于复杂自然环境下高铁线下工程沉降的长期自动化测试. 

Differential-Pressure Type Precision Measuring System of High-Speed Railway Substructure Settlement

A differential-pressure type settlement measuring method based on pressure transmitter was proposed for precision measurement of high-speed railway substructure settlement and deformation. First, the settlement measuring principle was introduced based on Euler differential equation of static fluid. Then, the measurement system error caused by temperature change was solved by differential-pressure treatment and temperature correction of fluid density. Typical technical parameters of the pressure sensor, such as the thermal sensor drift and sensor range, were analyzed; and a high-precision integrated system for automatic settlement measurement, namely HSMS-1, was designed and used in practice to measure the settlement of a high-speed railway bridge. The results showed that the measured values by HSMS-1 were consistent with those by an electronic level in the temperature range of -18 to 42 ℃, and the maximum error was only 0.44 mm. With a measurement range of 300 mm, the accuracy class of system could reach 0.2. Therefore, this system is applicable to long-term automatic monitoring of high-speed railway substructure settlement in complex natural environments.