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Precast box culverts made of prestressed concrete according to the recommended specifications of JISA 5373 by the National Box Culvert Association.
By placing PC steel materials on the top and bottom plates, it is possible to reduce the thickness of the members, resulting in a lighter structure compared to RC box culverts. Standard sizes range from a width of 1.8m × height of 1.2m to a width of 5.0m × height of 2.5m.
PC box culverts that contribute to the labor-saving and speeding up of construction.
PC box culverts are designed with prestressed concrete structures (using PC steel bars for transverse reinforcement) for the top slab and bottom slab, which are directly affected by variable loads (live loads). This design eliminates the occurrence of cracks, a common drawback of reinforced concrete products, and also enhances resistance to impact and repeated loads.
