张拉千斤顶、油表在预应力钢束张拉前进行检验和标定，使用中按规定程序进行送检标定。
Tensioning jack, oil gauge shall be checked and calibrated prior to the prestressed steel strands tensioning and executed to check and calibrate in using as per the specified procedure.
试验中采用专用的扁式液压千斤顶，并采用试验室足尺模型标定试验，研究了这种方法的可靠性。
The reliability of this technique, which is based on the use of special flat-jacks, has been studied by means of calibration tests carried out in laboratory on large size samples.
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