Taking Da-ning River Bridge in construction as the engineering background,the optimization analysis of cable forces and segmental cambers has been carried out during the process of arch rib segmental installment.

Considering the second-order effect in analyzing temperature effect, the relationship between preraised height and the deformation of stay cables is obtained.

The prearranged height calculations in control points of steel arch ribs during constructing a concrete-filled steel tubular arch bridge are divided into two parts: rigid body displacement and elastic deformation.

The control of messenger wire uplift is the key during the replacement construction of messenger wire without stretching equipment.

This paper gives the method calculating reaction force and raising distance of learing leys of truck crane,compiles the calculation program,and analysis reaction force and raising distance letween are influenced ly rigidity and working stalility of the truck crane, and prorides the dependabol method for designri and calculating frame of the truck crane.

Method and criteria for evaluation of wheel derailment based on wheel vertical rise;