High-precision evaluation, regulation and control method for concrete-filled steel tube arch bridge closure gap based on dynamic gray model

Abstract

The invention provides a dynamic gray model-based concrete filled steel tube arch bridge closure gap high-precision evaluation and regulation method, which comprises the following steps of: acquiring six real-time coordinates of corresponding positions of an installed section and a to-be-installed section through a high-speed tracking measurement optical monitoring technology, and calculating to obtain accurate description of parameters of a closure gap; comprise three-direction displacement deviation and closure section angle error; the precise evaluation model of the closure gap is established through precise parameter errors of the closure gap, and compared with a traditional vertical displacement deviation description method, the method is more precise and comprehensive; secondly, establishing a closure gap parameter evaluation influence matrix, and preliminarily predicting a high-precision closure buckle cable and a cable wind cable force; and finally, in the cantilever assembling process, closure parameter time sequence data is established, a DGM (1, 1) dynamic gray model is established, the variable quantity of an influence matrix is predicted in real time, the real-time adjustment quantity of a buckle cable and a cable wind cable is rapidly obtained, a dynamic regulation and control instruction is sent out, the rapid and accurate control over the arch rib line shape and the closure precision of a closure opening are improved, and the construction quality and efficiency are improved.

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