Abstract:

An automatic measurement scheme based on an established model is designed to achieve automatic measurement of flat deviations of pipe ring end face and provides a data basis for manual compensation of flat deviations in time. Furthermore, the test and application results are examined and presented. Then, the coordinates of the measuring points represented in the shield coordinate system are determined by analyzing shield tunneling characteristics. Consequently, the mathematical model of the flat deviation of the pipe ring based on the stroke of the thrust cylinder is deduced. It has been established that the relationship between the distance, base point between measuring points, and installation angle could be described using the trigonometric function. Also, the flat deviation could be calculated using the plane rectangular coordinate system. Moreover, an evaluation algorithm and measurement scheme based on the cylinder stroke sensor are designed. The actual test data indicate that compared with the manual measurement results, the system can automatically monitor the pipe ring flat deviation with higher precision and effectively reduce the labor intensity of the surveyor.

Key words: shield tunnel, pipe ring flat deviation, thrust cylinder, automatic measurement, data fitting