With the development and improvement of plastic pipe raw material synthesis production, pipe and pipe manufacturing technology, design theory and construction technology, plastic pipes have occupied a very important position in municipal public pipeline engineering. According to the introduction of Gao Lixin, deputy leader of the Plastic Pipeline Expert Group of the National Chemical Building Materials Coordination Group and the Director of the Science and Technology Development Promotion Center of the Ministry of Construction, by the end of 2005, the national plastic pipe production capacity reached more than 3.5 million tons, and the actual production volume reached 2.4 million tons. The amount of use reached 2 million tons, of which the amount of plastic pipes used in municipal and public works was about 1 million tons, and the market share reached about 30%.
Significant application in the construction industry
At present, plastic pipes have been widely used in the fields of urban water supply, urban drainage, urban gas, and urban central heating.
According to the data provided by Director Gao Lixin, the main types of plastic pipes for urban water supply are rigid PVC pipes (PVC-U), polyethylene pipes (PE), and glass fiber reinforced plastic sand pipes (GRP). 110,000 kilometers; the main types of urban drainage plastic pipes are rigid PVC pipes (P VC-U) solid wall pipes, PVC-U double-wall corrugated pipes, etc., and the total project usage has reached more than 50,000 kilometers; urban gas plastic pipe varieties There are mainly high-density polyethylene pipes (HDPE) and medium-density polyethylene pipes (MDPE). The cumulative project usage has reached about 50,000 kilometers and the utilization rate has reached nearly 30%. The main types of urban central heating and thermal insulation polyethylene casings are high-density. Polyethylene pipes (HDPE), medium-density polyethylene pipes (MDPE), and low-density polyethylene pipes (L DPE), the cumulative amount of engineering use has reached about 50,000 kilometers; the main types of plastic pipes for building water supply are rigid polyvinyl chloride pipes (PVC -U), Chlorinated Polyvinyl Chloride Pipe (PVC-C), Polyethylene Pipe (PE), etc., the total project usage has reached 8 billion meters (1.5 million tons); the main variety of plastic pipes for construction drainage is rigid polyvinyl chloride Pipe (PVC-U), the cumulative project usage reaches 1 billion meters (80 0 million tons); the main types of building heating plastic pipes are heat-resistant polyethylene pipes (PE-RT), cross-linked aluminum-plastic composite pipes (XPAP), etc. The cumulative amount of plastic pipes used for radiator heating and floor radiation heating has reached 3 billion Meters (300,000 tons); the main varieties of plastic protective sleeves for construction wires are rigid polyvinyl chloride pipes (PVC-U), and the total project usage has reached 12 billion meters (2 million tons).
Bright prospects for development
Director Gao said that no matter from the development strategy and plan of the country and the industry, or from the development speed of the construction industry, the application of plastic pipes in the construction industry has broad development prospects.
In terms of production energy consumption, plastic pipes are far lower than other building materials in the production, transportation and use processes, which are 25% and 12.5% of steel and aluminum, respectively. The energy consumption of rigid PVC plastic production is only that of cast iron pipes and 30% -50% of steel pipe. At the same time, due to the smooth surface, plastic water supply pipes can reduce water energy consumption by about 50% compared to metal pipes during use. For example, PVC pipes can save 62% -75% of energy than steel pipes for water supply, and can save energy than cast iron pipes for drainage. 55% -68%.
In order to further promote the development of the plastic pipe industry, the state has issued the "National Tenth Five-Year Plan of the Chemical Building Materials Industry and the 2010 Development Plan Outline" and related policy documents. The "Outline" clearly states that by 2010, 80% of construction drainage pipes will be plastic pipes, 70% of construction rainwater drainage pipes will be plastic pipes, 30% of urban drainage pipes will be plastic pipes, and construction water, hot water supply and heating pipes 80 ％ use plastic pipe, 70% of urban water supply pipe (DN400m m) is plastic pipe, 70% of village and town water supply pipe is plastic pipe, 60% of urban gas pipe (medium and low pressure pipe) is plastic pipe, 90% of construction wire threading protective sleeve Use plastic tube. In addition, in the Ministry of Construction's Announcements Nos. 27 and 218 and related guidance documents, plastic pipes have been promoted and used as a new type of building materials, which has promoted the promotion and application of plastic pipes in the construction industry. At the same time, the acceleration of urbanization will drive the development of urban infrastructure and increase the demand for municipal and public pipelines. According to relevant experts' calculations based on the development plan of the construction industry, during the "Eleventh Five-Year Plan" period, the average annual amount of plastic pipeline engineering will exceed 2 million tons, of which the amount of municipal public works and construction projects will reach more than 1.5 million tons. The demand is about 3 billion meters (about 500,000 tons of plastic pipes).
