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一、国外概况建筑塑料是塑料工业的两大用户之一,而塑料管道又是建筑塑料的最大消耗部门,约占建筑塑料的40％左右。美国五十、六十年代没有制订塑料管道标准,因此发展缓慢,六十年代中期产量还只有15万吨。七十年代初塑料管材进入高速度发展时期,1975年产量已是六十年代中期的5倍多。1980年产量高达138万吨。这主要是由于塑料管道能耗低,价格上升率远低于钢材和混凝土。1977年美国生产塑料管材91万吨,相当于金属管道800万吨,生产这些塑料管耗能21×10~(12)千卡,但生产金属管材需消耗103×10~(12)千卡能量,使用塑料管节能82×10~(12)千卡,
I. Overview of Foreign Construction Plastics are one of the two major users of the plastics industry, and plastic pipes are the largest consumer of construction plastics, accounting for about 40% of construction plastics. The United States did not formulate plastic pipe standards in the 1950s and 1960s, so it was slow to develop. In the mid-1960s, the output was only 150,000 tons. In the early seventies, plastic pipes entered a period of high-speed development. In 1975, production was more than five times that of the mid-60s. In 1980, the output reached 1.38 million tons. This is mainly due to the low energy consumption of plastic pipes and the price increase rate is much lower than steel and concrete. In 1977, the United States produced 910,000 tons of plastic pipes, equivalent to 8 million tons of metal pipes. The production of these plastic pipes consumes 21×10~12 kcal, but the production of metal pipes consumes 103×10~12 kcal. , using a plastic pipe to save energy 82 × 10 ~ (12) kcal,