Accompanied with replacement of the closure segment in the midspan,after removing the closure segment and thus forming two half bridges,the alignment of main girder was improved by means of adjusting cable forces,which is a precedent in maintenance of existing prestressed concrete cable-strayed bridges.

Authors researched mid-span closure segment ballasting methods for prestressed concrete continuous rigid frame bridge,aiming to expatiat the functions of ballasting and discuss the methods of basic ballasting.

In this paper, the construction of the closure segments and system transformation for the box girders is summarized, which is expected to serve as reference to the constrction of similar works.

On the main span and two side spans of the main bridge, there is each one closure segment, 2 m in length, and along with the closing of the spans, the Bridge has completed two time of structural system transformation.

Discussion on the span closure section construction in continuous rigid-framed bridge;

The construction technology of Pengxi river cable stayed bridge side span cast-in-place section and closure section

Based on engineering practice,the paper introduces in detail the construction technique of abutment on pier top and temporary buttress,the construction technique at 0 section,the construction technology of casting concrete for cantilever and cast-in-situ concrete section for side span and the construction technology at closure section,sums up the key construction technique of conti.