More than 70% of the existing drainage pipes in China were laid in the 1980s and 1990s, and they have a long service life and are mainly concrete pipes, clay pipes and culverts made of masonry. Due to the long construction period, the backward construction technology and the poor materials, the damage of these drainage pipes has occurred frequently, and many of the pipeline structures have even collapsed. In May 2010, Guangzhou suffered severe guilt due to heavy rain. According to the "Guangzhou Daily" report: At present, there are more than 6,000 kilometers of drainage network in the central city of Guangzhou, which only accounts for 83% of the total in one year, and only 9% of the total in the two-year standard. The combination of rain and sewage diversion and rain and sewage is two basic drainage methods in modern cities. As a result of the combination of rain and sewage, it not only increases the burden of the drainage network and the pressure of the sewage treatment plant, but also the loss of high-quality rainwater resources. The rain and sewage diversion will make rain and sewage go their own way. This is the drainage concept generally recognized in the field of modern municipal construction. According to the requirements of the “Code for Planning of Urban Drainage Projects” formulated by the former Ministry of Construction, the drainage system of “new urban, expanded new, new development or old urban reconstruction areas shall adopt a diversion system. In the conditional cities, the diversion of rainwater at the initial stage of interception may be adopted. Drainage system." At present, most of the drainage methods in the old city of China are rainwater and sewage, and urban sewage is discharged into the river through the mixed flow pipe network, which seriously pollutes the water environment and is in urgent need of renewal and transformation. The reform of China's old pipe network for rain and sewage diversion, material upgrading and expansion of caliber will greatly increase the market demand for drainage pipes. Urbanization brings huge market demand for the drainage pipe industry. With the sustained and rapid development of China's economy, the urbanization process has steadily advanced. Since China's urbanization rate reached 30% in 1996, it has increased by more than 1 percentage point per year. China's urbanization rate has reached 51%.With the gradual advancement of urbanization in subsequent countries, the scale of urban areas will continue to expand, which will lead to the addition of a large number of municipal roads. The increasing urban population will increase the discharge of urban sewage, which will increase the investment and construction of urban drainage networks. Demand. There is still a large space for the construction and renovation of urban sewage treatment supporting pipe network. At present, urban sewage treatment plant construction investment is more, but the construction of sewage treatment supporting pipe network lags, making it difficult for sewage treatment plants to really play a role, and the sewage treatment rate is not high.