What is a temporary support arranged during the hoisting period?

Temporary Support The temporary support arrangement during the hoisting period is shown in Figure 10. The channel steel type is 20. If one support is installed, it is arranged in the middle of the segment girder, and if two supports are installed, they are arranged at 1/4 of the girder ends.

How many hoisting periods are there?

The loading is mainly divided into three different hoisting periods (F < mg, F > mg and F = mg) to simulate the state of the segment from the point when the hoisting force is received to the acceleration in the air and then to the constant speed in the air. When the hoisting force is at the maximum level, the acceleration of the model is 1 m/s 2.

Do two inner and outer hoisting points meet the deformation requirements?

Therefore, the two inner hoisting point and two outer hoisting point schemes do not meet the deformation requirements regardless of whether the support is set, and the four hoisting point scheme can meet the deformation requirements when one or two supports are set. Figure 14.

How much stress can a precast box girder withstand?

However, the stress levels remain well within the safe limit of less than 2 MPa. The concrete roof deformation of the precast segmental composite box girders with corrugated steel webs is also positively correlated with the segment length.

How to design a lifting system?

The diagram presents the approach for the design of a whole lifting system. Another approach is to design individual accessories in the lifting system, where operational/geometrical parameters are considered before the structural verification with respect to rated capacity (WLL).

What is a four-hoisting point scheme?

The four-hoisting point scheme should be adopted for the hoisting of the precast segmental composite box girders with corrugated steel webs segment, that is, four hoisting points should be set near the web to meet the force requirements during the structural hoisting process.