Abstract: The existing inspection method for tunnel structure is single in index, low in mechanization, inspection efficiency, and intelligentization, and high in risk. Therefore, an intelligent comprehensive tunnel structure inspection equipment has been developed, integrating technologies such as non-contact remote detection, intelligent detection and recognition of apparent diseases, and equipment integration and intelligent control. This equipment realizes integrated detection of internal disease, apparent disease, and structural deformation of tunnel structure. The engineering application results show that this equipment realizes non-contact and efficient comprehensive detection of tunnel lining thickness, back cavity, steel arch distribution, lining cracks, lining damage, water leakage, tunnel cross-section, shield tunnel ellipticity, and segment misalignment, reaching an operating efficiency of 10－40 km/h, which is 2－8 times higher than that of conventional detection methods. The testing shelter adopts modular design, which can be equipped on wheeled vehicle chassis and track flat car, and is suitable for various conditions such as tunnel construction, completion acceptance, and operation period, thus it is worth popularizing.

Key words: tunnels, non-contact, multichannel radar, comprehensive detection, apparent disease