给水塑料管施工监理应注意的几个问题（Some problems needing attention in construction supervision of water supply plastic pipe）.doc

给水塑料管施工监理应注意的几个问题（Some problems needing attention in construction supervision of water supply plastic pipe） In recent years, our country has attached great importance to the development and application of new types of pipe materials, prohibiting or limiting the use of some metal pipes, and the application of new types of pipes has become more and more widespread. In the promotion of the use of pipes, mainly for all kinds of plastic pipe. But because some of the new national standard pipe in the design and construction acceptance, all kinds of problems in use, according to the experience in construction supervision, summed up the plastic water supply pipe in construction supervision should pay attention to the following questions: 1. selection of plastic pipes for water supply The water supply plastic pipe has high chemical stability, corrosion resistance, smooth pipe wall, and can effectively prevent corrosion and scaling of pipes. At present commonly used plastic water supply pipe are hard polyvinyl chloride (UPVC), high density polyethylene (HDPE), modified polypropylene pipe (PP-R, PP-C), polybutylene (PB), acrylonitrile butadiene styrene (ABS) pipe, cross-linked polyethylene pipe (PE-X) etc.. The utility model has the advantages of innocuity, sanitation, long service life, smooth pipe wall, small head loss, corrosion resistance, no scaling, environmental protection, energy saving, light weight and convenient installation. But there are also shortcomings and shortcomings, such as large linear expansion coefficient, poor ultraviolet resistance, small overhead span, many supporting points, and some tubes have high transmittance. The main advantages and disadvantages of various pipes are as follows: 1.1 rigid PVC pipe (UPVC) Advantages: high impact resistance and chemical resistance, hard texture, corrosion resistance, no fouling, easy installation, low price; Disadvantages: the seismic resistance is poor, in the process of use, there will be UPVC monomer and additi