Designs are dependent on project specifications and applications. Lateral earth loads from soil and hydrostatic loads from ground water. Vertical loads from the cover soil and live loads above. Surcharge loads from nearby impact loads. Seismic loads where applicable. After determining the size and design parameters required the appropriate ISO standards are used to provide the most economical design.

Internal dimensions varies from 600mm x 600mm to 3000mm x 3000mm.
Thickness of 50mm to 100mm with a standard length of 1000mm.
Grade: M40 – M50. Reinforcement: Fe550

Heavy Duty: Designed for lateral earth pressure and hydrostatic loads from ground water, live load supercharge and direct heavy vehicular loading.

Pacific Box culverts are cast using concrete with a low w/c ratio; it is poured into steel mechanized equipment called precast molds. Rebar is preplaced and secured inside the mould. Form vibrators are used to consolidate concrete to attain homogeneity and release any trapped air. Hole formers may be incorporated, or coring is done if needed. The product is then stripped and the mould is reused.

At every stage meticulous testing is done to maintain quality. Every concrete batch undergoes cube testing to ensure strength parameters are met along with slump testing to ensure consistence in the mix design. After demoulding the product goes through visual inspection to ensure no honey-combing, voids or cracks are present. In case any test fails the batch will be rejected.