Method for detecting axial force of concrete supporting beam by vibrating wire type steel bar stress meter
A technology for steel bar stress and concrete, applied in the measurement of the frequency change force of the stressed vibrating element, force/torque/power measuring instrument, measuring device, etc., can solve the error of the measurement result, and does not consider the dryness of the concrete solidification stage abbreviation
Active Publication Date: 2021-04-20
温州工程勘察院有限公司
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The main reason is that the drying shrinkage of the concrete in the solidification stage was not considered in the measurement, which caused a large error in the measurement results.
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[0036] The following is attached Figure 1-4 The application is described in further detail.
[0037] The embodiment of the present application discloses a method for detecting the axial force of a concrete support beam by a vibrating wire steel bar stress gauge. Since the shrinkage stress will be generated in the concrete solidification stage, and this part of the stress is not caused by the actual load, it is excluded. At present, in the actual measurement process, the readings of the initial steel stress gauge are relatively random, which leads to the superimposition of the shrinkage load into the calculation of the axial force of the subsequent test, thus causing great interference and influence on the calculated value of the subsequent axial force. In addition, temperature changes will also affect the measured value of the axial force of the supporting beam.
[0038] In related technologies, the value of the concrete modulus is determined according to the concrete elast...
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The invention relates to a method for detecting the axial force of a concrete supporting beam by a vibrating wire type steel bar stress meter. The method comprises the following steps: S1, measuring and recording the reading of the steel bar stress meter after the burying and pouring of the steel bar stress meter, so as to obtain an initial frequency value f0; S2, subtracting the factory calibration initial reading fs of the steel bar stress meter from the obtained initial frequency value f0 to obtain a concrete shrinkage influence correction value f1; S3, excavating a foundation pit; and S4, measuring the actually-measured frequency value fc of the steel bar stress meter in the supporting beam, adding the concrete shrinkage influence correction value f1 and the actually-measured frequency value fc to obtain a correction frequency value f, and calculating the concrete axial force value FT by utilizing the correction frequency value f. The method has the effect of improving the accuracy of the measured value of the axial force F.
Description
technical field [0001] The present application relates to the field of axial force detection of concrete support beams, in particular to a method for detecting the axial force of concrete support beams with a vibrating wire steel bar stress gauge. Background technique [0002] The foundation pit refers to the earth pit excavated at the foundation design position according to the base level and foundation plane size. Before excavation, the excavation plan should be determined according to the geological and hydrological data, combined with the conditions of the nearby buildings, and the waterproof and drainage work should be done well. According to the "Technical Specifications for Monitoring of Building Foundation Pit Engineering", the monitoring of the axial force of the concrete support beam of the first-level foundation pit is a must-test item. [0003] At present, the axial force of the concrete support beam of the first-level foundation pit is usually detected by the v...
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IPC IPC(8): G01L1/10G01L5/00
Inventor 马盛元杨显达赵仁基陈海滨刘建智潘跃春陈凡兰贤东陈航枫陈必微许鹏飞
Owner 温州工程勘察院有限公司