The keel is flexible, the steps are light, and the "eyes" are like copper bells... Recently, beside the drainage well cover on one side of Guanggu Third Road, East Lake High Tech Development Zone, Wuhan, a freely moving "robot dog" attracted public attention. "On the basis of not breaking the road, the 'robot dog' can quickly go deep into the rain and sewage pipelines for 10 meters underground, detect the pipeline diseases and provide accurate positioning, so as to provide first-hand data for the later repair and construction." Cheng Qili, project manager of East Lake drainage network investigation and reconstruction project of China Railway fourth Bureau, told reporters that 15 "robot dogs" have been introduced into the project to explore the diseases of the pipeline network underground, If the pipeline is found damaged, the staff will carry out "traceless" repair. The reporter saw at the scene that the "robot dog" has three pairs of "rubber claws" of different models to master the advance and retreat of the fuselage. The head and tail two groups of searchlights and cameras act as "electronic eyes" to pull the front and rear iron "neck rings" to help it move forward. After entering the well, the "mechanical dog" can transmit the image in the pipe back to the screen of the operator's hand-held console. The operator can command him to move forward and backward, up and down, capture and cross obstacles by moving his fingers. The operator told reporters that according to the disease types detected by the "mechanical dog", the staff can adopt a variety of pipeline trenchless repair technologies to effectively solve the defects and diseases such as internal corrosion, interface leakage and dislocation of the pipeline. "According to the test results, the project department timely adopts CIPP local repair technology to repair the pipe network. First, the resin soaked glass fiber fabric package is transported to the damaged part along with the pipe lining repair device, and then the air bag of the repair device is inflated. The inflated resin film is seamlessly bonded with the damaged pipe wall, which can be cured and formed in about 2 hours. Then, the air bag is repaired, deflated and contracted, and transported Outside the well, the loopholes have been repaired. "Xu Qing, director of the Engineering Department of the project department, told reporters that the drainage pipe network investigation and reconstruction (phase I) project covers the whole East Lake high tech Zone, and 1665 km of pipe network needs to be reconstructed. At present, the maintenance of each section of pipeline is about 2.5 hours, which only takes 4 hours at most. One team can promote the repair of 5 sections of pipeline every day, which greatly improves the work efficiency. (Xinhua News Agency)