The analysis was done for main girder unsupported span,depth-span ratio of girder,main-side span ratio,pylon height to girder span ratio,etc.

Sensitivity analysis of main parameters was made which included the height of towers,the length of non-stayed segments and the ratio of center span to side span.

Combined with the specific project example,it analyses the affecting factors of the construction of continuous rigid frame joint section and the construction requests,specifically introduces the construction technology of the side span,middle span joint section of continuous rigid frame,to perfect the construction technology of joint section,and this can supply good reference to related projects.

This main span box beam of cable_stayed bridge construction adopted the methods of precasting and putting pieces together, and the side span box beam construction adopted the methods of casting_in_place to concrete piecewise.

The article puts forward that (1) the continuous beam has the side span, and the area of the main span is large; (2) the height of the continuous beam is large, and the area of the bridge in the whole line is large under the condition of the equal longitudinal slope; (3) the different types of the bridges are relatively to the critical point of the technical and econom.