The road bed refers to the upper road bed and the lower road bed. The filling material requirements for the upper road bed 0-30cm and the lower road bed 30-80cm are generally higher than those of the roadbed, and the compaction requirements are also higher than those of the roadbed. For example (gravel underlayment).

The roadbed generally refers to the upper embankment (80-150cm) and the lower embankment (below 150cm). In many cases, it is filled with natural soil, (except for soft base replacement or special roadbed). The bottom is the soil roadbed) and the compaction requirements are also lower.

Based on the above situation, the unit price of road bed is of course higher than that of road bed.

Calculation is based on the length, height, and width of the filling, and the construction site records must be carefully recorded to avoid double counting. If the double counting technician is not clear about it, the measurement personnel should also be able to find it out. Just be careful and careful.