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Main technical content: The needs of railway construction and development, guiding the investigation and detection of underground pipelines and obstacles on urban railways in Shanghai, and in accordance with the requirements of the Urban Rail Transit Branch of the Shanghai Transportation Industry Association's "Notice on the Issuance of the '2021 Shanghai Urban Rail Transit Standardization Plan'" (No. 2 of the Urban Rail Transit Branch of the Shanghai Transportation Industry Association), drawing on the experience of underground pipeline and obstacle investigation and detection in Shanghai and other domestic regions, and referring to relevant norms in Shanghai, China, and the railway industry, this standard was compiled on the basis of extensive investigation, research, and solicitation of opinions. This standard is designed to standardize and unify the investigation and detection of underground pipelines and obstacles on urban railways in the city, ensure the quality of the results, and prevent safety risks to underground pipelines and obstacles during the implementation of the project. This standard applies to the planning, survey, and design of urban railways in the city to meet the requirements of investigating and detecting underground pipelines and obstacles in Shanghai during the planning and construction phases. During the investigation and detection of underground pipelines and obstacles, appropriate geophysical detection methods and technologies should be selected based on the purpose of the survey and the site conditions, combined with relevant data for comprehensive analysis, and attention should be paid to the comprehensive verification of the detection results and the follow-up evaluation of the detection effect. During the investigation and detection of underground pipelines and obstacles, mature experiences should be actively promoted, and the use of new technologies, new processes, new methods, and new equipment should be encouraged, while meeting t