The Construction Techniques Applied To Meixi-River CFST Arch Bridge At Fengjie, Chongqing

CFST (Concrete-Filled Steel Tube) is a new type of compound material. It's bearing capacity is much greater than RC (Reinforced Concrete). And the amount of form needed during construction is greatly reduced. It's fire endurance and impact resistance are much better than RC. Because of its excellent performance, CFST is widely used in bridge engineering. In addition to its priority to other materials in mechanical performance, the flowing freely line and great vehemence of CFST arch bridge won itself a place in bridge building.The purpose of this thesis is to summarize my work during the building of ChongQing MeiXiHe CFST bridge comprehensively. It is a top load bridge with a clear span of 288m, which is maximum one of the same structural system in Asia. The main arch rib uses 8 steel tube of 920mm joined by web members and transverse truss to form a space truss. The soldier piles on the arch are made of bent frame to make the shape both artistic and novel. The construction of the bridge began in Oct 1999, and the closing up of the steel tube was in Dec 2000. During that period, I learned and analyzed the current construction methods fairly comprehensively, and collected the construction technique data of the CFST arch bridges having been built. Based on this, aided by the simulation of construction procedure using finite element program, I proposed the operation program to make the steel tube segment be located at one time, and the scheme of dividing rooms to segment pouring. These suggestions were adopted by the construction. And I communicated and discussed comprehensively with construction unit on the concerning the construction safety.This thesis is my perception and summary of the construction procedure of the MeiXiHe Bridge. The thesis is divided into 7 chapters. The chapter 1 is brief introduction of CFST: summary of the domestic development of such structures and the basic performance, samples of its application in bridge engineering are introduced also. The chapter 2 introduces the basis principles and main methods of the computation of internal force and the design calculation of CFST arch bridge. The chapter 3 introduces the erection technique of CFST arch bridge. The chapter 4 is a comprehensive introduction of the structural system of the bridge. Based on the particular condition and the result of finite elements analysis, the methods of locating the arch segments at one time and the dividing rooms to segment pouring are proposed. The chapter 5 is the construction technique and guaranteeing measures. Mainly introduces the technique measure to ensurethe revised construction method to be successfully applied. The chapter 6 is the monitoring during construction procedure. The contents and methods of monitoring to ensure the construction safety are mainly introduced in this chapter. The chapter 7 is main conclusion and some perception of my own..Limited by my knowledge, there will inevitably be some defect in the thesis. In order to improve my theoretical and practical level. I \\ill continue diligent, go on to absorb new knowledge and master new techniques. And 1 will close concern the tendency of the development of CFST arch bridge in the world, to contribute to the improvement of the construction techniques of CFST arch bridge.