The Research On Construction Techniques Applied To Dongpu Bridge Of Ring Expressway In Guangzhou

Dongpu bridge is a two continuous multi-span prestressed concrete continuous rigid frame bridge with the total length of 1093.5m,which is consists of two kinds of spans 80m and 160m,ring expressway of Guangzhou City. The bridge is located on the alluvial plain in the front of Pearl River sloping field. Its piles pass through weak soil layer ,sandy clay and gravel stratum;piles' sustaining layer sits in weak-weathering or faint-weathering mudstone. Because of the changing the design,there are greater differences between the constructed basis structure and the modified structure. That causes new problems of construction on making use of or abandon old basis structure. Based on the characteristics of the bridge foundation,this paper in detail introduces the design of construction procedures,construction methods and technological process for large temporary structures in foundation construction and driven or pull out steel casing pipe etc,which are seldom meet in common bridge construction. About digging and construction of foundation piles,dynamic detection method of pile foundation etc. are also introduced and analysized.Although cantilever concreting methods of continuous rigid frame bridge are comparatively mature,considering this bridge's characteristics,this paper mainly gives the design of constitution scheme and technologies,and so on. The construction methods and technologies provide experience for reference concerning the foundation construction in water and large-span continuous rigid frame bridge's construction.