Tianyancha intellectual property information shows that Tongxiang City Sutai Expressway Investment and Development Co., Ltd., Harbin Institute of Technology, and Zhejiang Shuzhi Jiaoyuan Technology Co., Ltd. have obtained a patent titled "Rapid Diagnosis Method for the Condition of π-Shaped Steel-Concrete Continuous Rigid Frame Bridges under the Action of Small Vehicles," with authorization announcement number CN117589399B and an application date of October 2023.

　　The patent abstract shows that the "Rapid Diagnosis Method for the Condition of π-Shaped Steel-Concrete Continuous Rigid Frame Bridges under the Action of Small Vehicles" relates to bridge condition diagnosis methods. For a four-span π-shaped steel-concrete continuous rigid frame bridge, the full length L of the main girder is determined by measurement; the cross-sections at positions L/8 and 7L/8 are selected as the test cross-sections of the bridge; the wheelbase, front axle load, and rear axle load of the loading vehicle are determined as technical indicators; the displacement time histories of the bridge test cross-sections under the traveling of the loading vehicle are collected; spatiotemporal coordinate transformation of the displacement time histories of the bridge test cross-sections is performed; the measured displacement matrix of the test cross-sections is constructed; the vehicle information matrix is constructed; the actual quasi-static displacement influence line inversion matrix is constructed; and early warning judgment of the bridge service condition is carried out. Through real-time acquisition of the displacement responses of the test cross-sections during the entire traveling process of a small loading vehicle on the bridge, conversion into quasi-static displacement influence lines is performed, and early warning judgment indicators are proposed, enabling accurate judgment of the abnormal degree of degradation in the service condition of four-span π-shaped steel-concrete continuous rigid frame bridges.