Concrete secondary products box culvert
<National Box Culvert Association Unified Type>
This is a standard product of the National Box Culvert Association, as described in the "Guidelines for Road Earthworks and Culvert Construction" by the Japan Road Association and the "Guidelines for Buried Precast Box Culvert Roads" by the National Institute for Land and Infrastructure Management, and it is certified as Class II by the Japan Sewage Works Association.
- Company：大和クレス
- Price：Other
