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• Time of issue:2008-08-18 00:00
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(Summary description)The historical experience of countries in the world in the process of modernization shows that the development speed of plastic pipes has exceeded the economic development speed of the same period. It is an irresistible trend to replace traditional pipes with plastic pipes. Even in developed countries where dense plastic pipe networks have been built, the application of plastic pipes is still increasing year by year. For example, in 1986, the total consumption of plastic pipes in Europe was 2.134 million tons, which increased to 3.465 million tons in 1998, with an average annual growth rate of 5.2%. , Exceeding the national economic growth rate over the same period. In the past 10 years, the average annual growth rate of China's plastic pipe market was 20%. In 2000, 2002 and 2003, the output reached 700,000-800,000 tons, 1.3 million tons and 1.5 million tons, respectively, with a growth rate of 15%. Among them, PVC pipes account for 55% and PE pipes account for 40%. It is estimated that before 2010, the average annual growth rate of domestic plastic pipes will still exceed 20%. 　　The advantages of plastic pipes 　　Plastic buried pipes have been widely used abroad. The reason is that buried pipes have many advantages over traditional buried pipes such as cast iron pipes, steel pipes, and cement pipes: 　　Strength and rigidity On the surface, the strength and rigidity of plastic buried pipes are not as good as cement pipes, especially reinforced concrete pipes. In fact, plastic buried pipes are "flexible pipes". Under correct design and laying, the plastic buried pipes and the surrounding soil can bear it together. Therefore, plastic buried pipes do not need to have the same strength and rigidity as concrete pipes and other "rigid pipes" to meet the mechanical performance requirements in buried use. 　　Hydraulic characteristics Plastic pipes have smooth inner walls, low resistance, and large water flow. Under the same diameter, the water flow of plastic pipes is greater than that of concrete pipes. When the terrain has slopes, the diameter of plastic pipes can be reduced and the construction volume is smaller. The sealing performance of the sealed cement pipe is very poor. The domestic concrete pipe with flat joint only needs to be sealed with a ring of concrete at the joint. It is difficult to ensure no leakage during construction. In addition, the rigid pipe of the concrete pipe system moves slightly (such as uneven soil settlement) It can cause damage to the connection. In addition, the cement pipe is sealed with a vulcanized rubber ring, and the plastic pipe is sealed with a thermoplastic elastomer sealing ring. The service life of the former is shorter than the latter, and the connection and sealing of the plastic pipe have a series of strict requirements to maximize It is guaranteed that no leakage will occur. The life of cement pipe is only 15 years, and the life of plastic pipe is as long as 50-100 years. Domestic sewage and rainwater are usually corrosive, and industrial sewage is more corrosive. Metal and cement buried drainage pipes are used for transportation, and the corrosion resistance is worse than that of plastic pipes. The outdoor natural environment in some areas is very corrosive. For example, when reclaiming land from the sea in Tanggu New District, Tianjin City, the cement drainage pipes cannot be found after 3 years, and they are all corroded by the salt in the sea water. Plastic pipes have to be laid again. . 　　Laying construction 　　Plastic pipe is light in weight, large in length, few joints, low requirements on pipe trenches, convenient connection, quick construction, low construction cost, and its superiority in urban and harsh natural conditions is more prominent. 　　Comprehensive economy 　　In terms of comprehensive economy, the advantages of plastic pipes are being recognized by more and more users. Although the unit price of plastic pipe is slightly higher than that of cement pipe, the total project cost is not higher than that of cement pipe. The Tianjin Municipal Engineering Design Institute has conducted systematic research on UPVC double-wall corrugated pipes in 1992 and PE double-wall corrugated pipes in buried drainage pipes since 1998. The conclusion is: "The engineering cost of double-wall corrugated pipes is comparable to that of concrete flat openings. The pipe is equivalent, 30% lower than the socket concrete pipe. The construction period is significantly shortened and the economic benefits are significant." 　　 Large-caliber outdoor PE buried pipe is the world development trend 　　 In the past 10 years, an obvious international development trend of plastic pipes is the rapid development of water supply and gas PE pipes. Since the 1998 Munich International Coal Union LGU Gas Distribution Committee meeting unanimously recommended the use of PE buried gas pipelines as distribution pipes, after more than 10 years of research and development in various countries in t