Simulation-Based Tracking Test and Optimization of Large-Tonnage Box Girder Transport with Trolley on an Erected Bridge

Table 4

The control parameters for three-stage construction of prestressed tension.

Number	Specification	Number of holes	Anchorage stress of prestressed tension (MPa)	Minimum strength requirement of concrete (MPa)
1	N2–B4	4	930	25
2	N4–N1–B3–N3–B1	10	930	40
3	N2–N4–B4–N1–B3–N3–B2–B1	16	1395	50