The urban underground pipeline is the lifeblood and meridians of the city. The state and the local government will spend a lot of manpower and material resources on the construction of underground pipelines. Therefore, it is particularly important to clean up the underground pipelines at ordinary times. In the cities that have already carried out the urban underground pipeline census, although the drainage pipe network belongs to the investigation and detection scope, the main location of the pipeline is the location, depth, diameter and material of the pipeline. The development of these works can satisfy the needs of urban planning and municipal construction to some extent, but due to the requirements of the industry management and departmental management There is a considerable difference between the heavy surface and the simple method. It is far from meeting the requirement of deepening the management of municipal drainage system.

1." style="box-sizing: border-box">CCTV detection robot The closed circuit television inspection system (CCTV) of technical pipeline, which appeared in 1950s, is a tool specially used for underground pipeline inspection. It is one of the longest detection technologies used in sewer network detection, and is also the most commonly used method at present. When the system is detected, the operator remotely controls the crawler on the ground, controls the video capture in the pipeline, uses closed circuit television to collect images, and carries out visual image display and recording by means of the cable transmission mode. According to these recording images, Guangzhou Di Sheng technical personnel carry out the evaluation and analysis of the internal condition of the pipeline. The detection technology is easy to operate, accurate and intuitive in image recording and judgment, and avoids personal casualty accidents that may occur in the pipeline. However, before the test, the water level in the pipeline should be temporarily lowered, and if necessary, the inner wall of the pipeline should be pre cleaned. Pipeline CCTV detection technology has been widely applied in the detection of drainage network at home and abroad. In recent years, it has been widely used in large cities in China. Shanghai, Guangzhou, Beijing, Wuhan and other places have applied this technology to pipeline inspection and evaluation, and get better results and experience.   

2, pipeline sonar detection technology, pipeline sonar detection using acoustic reflection technology to scan sonar inside the pipeline, detect and locate objects in water, provide accurate quantitative data, detect and identify the damage of pipelines. Sonar has the advantages of high sensitivity, strong penetration, flexible detection, high efficiency and low cost. It can provide accurate data, and can be combined with CCTV and various environmental sensors to conduct a comprehensive inspection of the pipeline structure.   

3. Pipe periscope detection technology pipe periscope is a portable rapid inspection equipment for visual pipes. The camera can be placed in a manhole or pipe by adjusting the length of the camera operating lever, and clear video or images can be obtained by adjusting the illumination and camera. The operator can directly browse the image through the display screen which is equipped with it, and record and judge the cracks and blockage in the pipeline in real time. It is suitable for inspection of inspection wells and pipes close to manhole pipes (diameter 150 ~ 2000mm). The detection technology is easy to operate, portable and intuitive, and has been applied in most cities in China.