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PE pipes to replace the traditional plastic drainage pipe will be the development of a new trend
In the modernization process in the countries of the world's historical experience shows that the pace of development of plastic pipe in excess of the speed of economic development over the same period, using plastic pipe to replace the traditional pipe is the irresistible trend of historical development. Even if the clouds have already been constructed plastic pipe network developed countries, the application of the amount of plastic pipe is still growing year by year, for example, in 1986 the total volume of plastic pipes in Europe for the 2.134 million t, 1998 grew to 3.465 million t, an average annual growth rate of 5.2% , over the same period in the national economic growth. In the past 10 years, China plastic pipe market, an average annual growth rate of 20%, 2000, 2002 and 2003, respectively dadao 70wan-80 annual output of 10000 t, 130 Wan t and 1.5 million t, a growth rate of 15%, PVC pipes account for 55%, PE pipes accounted for 40%. Is expected to 2010, average annual growth rate of domestic plastic pipe will continue to exceed 20%.
The advantages of plastic pipe Buried plastic pipe has been widely used in foreign countries because of underground pipes than the cast iron pipes, steel pipes, cement pipes and other traditional underground pipe has many advantages:
Strength and rigidity The surface, underground plastic pipe cement pipe is less than the strength and rigidity, especially in reinforced concrete pipe, in fact buried plastic pipes are "flexible pipe" in the proper design and the construction of the construction of, the plastic of buried pipe and surrounding soil have to bear load, therefore, plastic underground pipes do not need to meet with the concrete pipe and other "rigid pipe" the same strength and rigidity, they meet the underground in the use of mechanical performance requirements. Hydraulic characteristics of plastic pipe wall is smooth, the resistance is small, the water circulation of large, at the same diameter plastic pipe under the concrete pipe flow than large, sloping terrain, the plastic pipe of the pipe diameter can be reduced, construction, small volume.
Cement pipe sealing tightness is poor, the domestic level interface to concrete pipe at the junction alone wiping lap concrete, construction, difficult to guarantee not to leak, coupled with concrete piping rigid tube, a slight movement (such as uneven settlement of the soil) connections can cause damage to another, cement governing the use of vulcanized rubber ring seal, plastic tube connected with the thermoplastic elastomer O-ring seal, the former life shorter than the latter, and the plastic tube connected and sealed a series of strict requirements, to maximize to ensure that leakage does not occur. Cement pipe life span of only 15 years, plastic pipes up to 50 years -100 years of life.
Domestic sewage, rain water, etc. are usually corrosive, corrosive industrial wastewater greater use of metal, cement, underground pipes conveying, corrosion resistance, worse than the plastic tube. Corrosion in some areas outside the natural environment is very large, such as the Tianjin Tanggu District of Reclamation, the laying of concrete sewage pipes could not find three years later, and were in the salt water corrosion away, and had the second re-laying of plastic pipe .
The laying of the construction Plastic tube light, the length of large, joint less demand on the trench low, connection convenient, fast construction, construction cost less, in the city, and poor natural conditions, the advantages become more prominent.
Comprehensive Economic In the integrated economy, the advantages of plastic pipe is being recognized more and more users. Although the plastic pipe is priced slightly higher than the cement pipe, but the total project cost is not higher than the cement pipe. Tianjin Municipal Engineering Design Institute since 1992 to the UPVC double-wall corrugated pipe, in 1998 on the PE double-wall corrugated pipe in the underground drainage system in the application of research findings as: "double-wall corrugated pipe of the project cost and concrete flat tube rather than the concrete pipe socket bearing 30% lower. significantly shorten the construction period, with significant economic benefits. "
PE large-caliber outdoor buried pipe is the trend of world development Over the past 10 years, the international community a clear plastic tube trend is the development of water supply and gas supply PE pipe fast. Since 1998, Munich International Joint LGU distribution of coal gas committee unanimously recommended to use PE as a buried gas pipeline with a pipeline and has more than 10 years after the world research and development, PE pipe has been developed into a multi-species, multi-pipe applications. Start with the input from the gas, PE pipes into the city water supply and drainage, irrigation, sewage, mine fields, floor heating, chemical and pharmaceutical sectors. Statistics show that, PE pipe 10% -15% annual rate of increase.
Amount of PE pipe than the main pipe UPVC pipe with PE materials continued to achieve significant growth The early days of plastic pipe, PE pipe is far less than the amount of PVC pipe, the main reason is economy. At that time high-performance PE pipe material has not yet been developed, only the use of performance equivalent to PE63 grade PE materials, due to low intensity, under the same conditions than the PE pipe wall thickness of PVC pipe big one times, not only material costs high and only in the lower pressure, the application of a smaller diameter pipe, or wall thickness can not be used too much. With the R & D efforts have been increased, a new generation of high-intensity special PE pipe materials continue to emerge, not only there PE80 level, but also appears PE100-class products. PE pipe materials, upgrading to a variety of stress significantly increased, Getting thinner and thinner wall thickness, or even lower than the PVC pipe.
PE pipe welding flexible and can be Despite the high-grade special PE pipe material cost than PVC high, but is also widely used in developed countries, one of the reasons is the PE pipe has unique flexibility, elongation at break 500%, and bending radius of pipe diameter can be as small as 20 -25 times the resistance capacity of the fine scratches. PE pipe laying, when moving, bending, and interspersed easy. PE pipe for trench requirements of low, not only can reduce the cost of pipe trench, and when the basis of uneven settlement and dislocation occurs when the pipe is also difficult to damage. Welding is a PE tube can be another unique performance, large-diameter pipe on the heat shrinkable tape can be used to connect. Novel use of PE pipe:
(1) The smaller diameter PE pipe coil can be a long way supply, transportation, laying, installation is very convenient; (2) large diameter flexible PE pipe is commonly available in shops on the ground and then connected into the pipe trench, the construction is very convenient; (3) In certain situations may from time to dig trenches, but with the laying of pipe-jacking technology, PE pipe; (4) can be used long-barreled sink method in river, lake, river, sea water at the end of the laying of PE pipes, but also in the desert on the Trenching laying of PE pipes is not: (5) PE pipe can be used to do repair the old drainage pipes inside the fill tube.
Low-temperature toughness PE pipe PVC pipe better than the low-temperature toughness, in the north, northeast and northwest regions, the winter temperature is generally 0 ℃ -30 ℃. PVC pipe will harden brittle, even if the temperature as low as -30 ℃, PE pipe is still maintained good flexibility, not become brittle.
Anti-aging now required to control the PE into a blue or black, especially after adding 2% of carbon black to prevent light and UV damage. PVC pipe is made of yellow or white, can not for long in the sun exposure.
Environmental PE pipe right did not harm humans and the environment. As the use of heavy metals, salts, stabilizers do, so PVC pipe would produce water and soil pollution, heavy metals, such as the use of incineration of waste PVC pipe recovery, but also produce dioxins and other harmful substances.
Large-diameter pipe using a structured wall pipe Buried plastic pipe can be divided into solid-wall pipe and structure of the wall tube two broad categories, the pressure pipes commonly used solid wall pipe. On behalf of the drain ring stiffness to withstand external pressure load capacity, with the pipe is proportional to the moment of inertia and elastic modulus, and inversely proportional to the cube of diameter. In the ring stiffness under the same conditions, the use of structured wall pipe than the use of solid-wall pipe to save materials, 50% -70%. Structural wall in possession of 6 types: PVC double-wall corrugated pipe, PVC reinforced pipe, HDPE double-wall corrugated pipe, HDPE Pipe, tube and kt RPMP. Currently used most are: Φ500mm below, PVC double-wall corrugated pipe, PVC pipe and HDPE Reinforced double-wall corrugated pipe; Φ500mm above, HDPE double-wall corrugated pipe, carat tube, Pipe and Glass Reinforced Plastic Pipe. Large Diameter HDPE double-wall corrugated pipe is six kinds of structural advantages of the most prominent wall of the tube type, mainly because raw material provinces, low-cost, high production efficiency, overall performance is good, convenient and safe construction. |
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