To improve a conventional culvert construction method by making use of characteristics of foamed styrol whose disposal method as a waste has been at issue and recycling it as a raw material for an excellent culvert member.

If an appropriate crushing method is selected for the foamed styrol, cells on the surface of fragments are broken to form fine holes so that the fragments are easily made into blocks with inorganic cement. On the basis of knowledge that excellent performance in water permeability, pressure resistance, lightweight property, etc., can be developed if the size of the fragment is selected, the culvert members by which the conventional culvert construction method can be improved by making use of the performance and characteristics can be obtained.