Bridge detection method based on POS system

Abstract

The invention discloses a bridge detection method based on a POS system, and the method comprises the steps: installing the POS system on a measurement carrier according to the line form detection requirements of a bridge, and building a bridge axis coordinate system and a measurement coordinate system; planning a measurement path with the reference of the number of lanes of a to-be-detected bridge and a line form structure, and designing a measurement speed; obtaining the detection discrete line form on the measurement system based on the POS system according to the attitude angle and position of the measurement carrier in a navigation coordinate system; carrying out the error analysis and preprocessing of the detection discrete line form, and obtaining a preprocessing discrete line form; finally converting the preprocessing discrete line form into the bridge axis coordinate system through a conversion formula, and obtaining a POS detection line chart reflecting the real structure of the bridge. The method can achieve the quick and accurate measurement of the deformation position and quantity of the bridge, wherein the measurement precision can reach a millimeter level. The method can achieve the high-precision detection of the line form of the bridge structure.

Description

technical field [0001] The invention relates to the technical field of bridge detection, in particular to a bridge detection method based on a POS system. Background technique [0002] The main purpose of bridge inspection is to evaluate the performance and safety status of the bridge. In the field of bridge detection, the structural alignment of bridges has always been regarded as an important index for evaluating the overall structural performance of bridges and analyzing their stress conditions. In order to facilitate the systematic and effective detection of changes in bridge alignment, all bridges must be accurately measured for their initial structural alignment at the initial stage of construction, and then the bridge structural alignment will be systematically detected in a regular or irregular manner, and then compared Structural line graphs in different periods to analyze the law of their changes. [0003] The traditional detection method of bridge structure alig...

AI Technical Summary

Problems solved by technology

This method has high measurement accuracy, but it needs to set permanent reference points, set up instruments, determine measurement points, etc., the measurement process is very complicated, the measurement method has a long working cycle, time-consuming and laborious, and the test conditions are very harsh. Higher precision measurement results can only be obtained under the conditions, which cannot meet the application requirements of a large number of small and medium-sized bridge structure safety inspections

[0004] Although the latest GNSS measurement method can achieve fast structural alignment measurement, the measurement accuracy depends on the unobstructed situation of satellite navigation signals, and is susceptible to interference from cables and bridge towers

[0005] The dynamic measurement method strapdown inertial navigation technology collects the motion parameters through the internal gyroscope and accelerometer acquisition device, and obtains the motion trajectory of the carrier through integral calculation. However, the integral calculation method is used in the calculation process of the motion trajectory. , will lead to a slight deviation in the trajectory calculation process that will become larger and larger at the end, showing a divergent trend

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