Study on Water Leakage Detection and Treatment in Metro Station Structures

Introduction: Considering the condition of water leakage at metro stations and the availability of various leakage detection methods, studying combination detection methods suitable for various working conditions can serve as the basis for leakage treatment. Purpose of the study: We aimed to use a number of leakage detection methods that can complement and verify each other in terms of accuracy and depth of detection, improve the identification of defects, and ensure precise grouting. Methods: In the course of the study, model tests and field application of detection methods were used. Results: Using an infrared detector and a water leakage detection instrument, it is possible to identify leakage points on the surface of both the non-decorative layer and the wet-sticking decorative layer more accurately. By combining a ground penetrating radar and an ultrasonic cross-section scanner, it is possible to better identify internal structural defects within both the non-decorative layer and the wet-sticking decorative layer. If the decorative layer is not dismantled, an air-coupled radar based on an industrial endoscope and a specially developed camera system can effectively detect the leakage path in concrete as well as surface leakage points.