The following are performance requirements for new plastic drainage pipes. Strength and stiffness properties: On the surface, the stiffness of plastic buried drainage pipes is not as good as that of concrete drainage pipes, especially reinforced concrete pipes. However, in practical applications, because the plastic buried drainage pipe is a "flexible pipe", under the correct design and construction, the plastic buried drainage pipe and the surrounding soil bear the load together. Therefore, the plastic buried drainage pipe does not need to achieve the same strength and stiffness as the "rigid pipe" concrete drainage pipe, so as to ensure that it can meet the requirements of mechanical properties in buried use; hydraulic performance: the plastic pipe has a smooth inner wall. The resistance is significantly smaller than that of concrete pipes. Under the same slope, the flow rate required by the design can be achieved by using a plastic buried drainage pipe with a smaller diameter. Under the same pipe diameter, the use of plastic buried drainage pipes can reduce the slope, that is, the workload of construction can be reduced, and the pumping station can even be reduced in the middle, which can save the long-term operation cost of the system; sealing performance: the connection of plastic pipes is relatively reliable, which is absolutely indispensable in China. Most of the concrete drainage pipes with flat joints use a circle of concrete at the connection, and it is difficult to ensure that there is no leakage during on-site construction. The concrete drain pipe with tongue and groove at the joint is slightly better than the flat joint. Even if it is changed to a concrete drain pipe with a flexible joint, its sealing performance is more reliable, but its flexibility is still not as good as that of a plastic pipe; service life and corrosion resistance: service life and resistance Corrosion performance is the most prominent advantage of plastic pipes, and its aging resistance and weather resistance can reach 50 to 100 years. The domestic sewage and rainwater transported by buried drainage pipes are often corrosive, and the rainwater flowing through the ground often dissolves into corrosive substances, or becomes acidic or alkaline. Production sewage and industrial drainage are often highly corrosive. The corrosion resistance of plastic buried drainage pipes is far better than that of metal pipes, and is also significantly better than that of concrete pipes. The anti-wear performance of plastic buried drainage pipes is also very good; laying and installation performance: In terms of auxiliary installation and construction, the advantages of plastic pipes are more significant. It mainly has the following advantages: light weight, large length, few joints (one can be 6m, 9m, 12m or even longer); low requirements for pipe trenches and foundations (concrete pipes generally need to be used as concrete pipe foundations), easy to connect , Fast construction (concrete joints need maintenance), in urban crowded areas, geologically harsh areas (such as high groundwater level, soft foundation), the advantages of plastic buried drainage pipes are more obvious.
