The thermal expansion and contraction of PE pipe fittings during construction in winter or summer can easily damage the PE pipe fittings. Therefore, it is necessary to prevent the longitudinal expansion and contraction of the PE pipe fittings. Large-caliber water supply pipe

The PE pipe fittings should be laid in a serpentine shape in the pipe trench, with a slight curved arc, leaving a margin for expansion and contraction, and when installing the PE pipe, there should be no expanders or double-drum short pipes instead of expanders. When making PE pipe fittings buttresses and town piers, both sides should be simultaneously poured with concrete at one time. The bottom foundation of PE pipe fittings must be cushioned with fine sand and not less than 100 mm. After the PE pipe fittings are installed, the 500mm backfill work on both sides and the top of the pipe must be backfilled and compacted, and the backfill compaction coefficient is not less than 95%.

When PE pipe fittings are installed in hot weather, they should be constructed as far as possible from night to 8:00 in the morning. The atmospheric temperature is low, and the pipeline is properly contracted and then backfilled and the final joint meets. It must be layered and compacted to prevent the pipeline from expanding and contracting. Large internal stress damage.