Advantages:
 1. High strength: 1.5 to 3 times stronger than cement pipe.
 
  2. Light in weight: only 1 / 15 ~ 1 / 5 of the cement pipe with the same diameter.
 
  3. Long service life: service life is more than 100 years.
 
  4. Low cost: when the span (diameter)≥1m, the bigger the span is, the greater the economic benefits will be.
 
  5. Convenient in construction: no need large machineries, only a little hand works is required on site.
 
  6. Good axial flexibility: suitable for the places where the foundation settlement is serious.
 
  7. The construction period can be shortened in half, hence saving labor costs.
 
  8. Help to improve the " faulting of slab ends" phenomenon of land-based structures at the junction with the embankment, and improve the driving comfort.
 
 
  9. Environmental protection and low-carbon release: reduce or completely abandon using conventional materials such as cement, sand, gravel and timber, this is conductive to environmental protection and reduction of carbon emissions.
 
 
  10. Easy maintenance: maintenance free in a considerable part of the environment, hence reducing the operation costs significantly.