The application of drainage plastic pipes is carried out on the replacement of ordinary drainage cast iron pipes. At present, drainage plastic pipes can be used in buildings with a height of 100m or less, but the progress in various regions is very uneven. When the building height is greater than or equal to 100m in high-rise buildings and occasions where drainage plastic pipes are not suitable, flexible earthquake-resistant drainage cast iron pipes can be used.
Some problems with drainage plastic pipes:
1. The rigidity is small and the flatness is poor, and it needs to be solved by encrypted pipe clamps, brackets and hangers
2. Poor flame retardancy. Fire-stop rings and fire-proof casings need to be installed at the roof slabs, firewalls, and pipe well walls that cross the floor and the upper roof.
3. The coefficient of thermal expansion is large, and expansion and contraction compensation devices are needed to solve the problem.
4. Poor resistance to mechanical impact, it is necessary to strengthen the construction technology and elaborate construction to solve it.
5. Poor heat resistance and low softening temperature. It is necessary to limit the drainage temperature, limit the use place and control the distance from the heat source.
6. Poor sound insulation. The noise of plastic pipes is greater than that of cast iron pipes. The problem is particularly prominent when the pipes are exposed and located close to the bedroom. The noise reduction method improves the sound insulation effect of the pipe material. The core layer foam tube hollow wall tube is developed based on this idea; the other way to reduce noise is to change the water flow conditions, and the idea of combining the two methods is Development of core foam spiral tube and hollow wall spiral tube.