Research On Prestressed Concrete Continuous Rigid-frame Bridge Construction Control And Fold Technology

Cantilever is adopted in most large span prestressed concrete continous rigid frame bridge. Technics of cantilever is complicated which need favorable construction technique and organization and administration to ensure construction quality and safety,so scientific construction control technology is important to construction. It is very instructive to research closure because of many plant disease.Do the following content.(1) Briefly introduced the development present situation and the development trend of the bridge. Through a lot of example analysis, it is concluded that the main diseases rigid box girder crack and for provent down, and analyzes the reasons of these diseases for future design and construction provides reference.(2) Along with the construction technology continues to mature, construction monitoring technology is also in the continuous development. Domestic and overseas scholars to construction monitoring technology is also conducted a wide range of research work. Based on the existing construction control technology to arrange, will it more theorized, systematized. The construction control technology for future reference for the study. It also analyzes the influence of various factors, surveillance data processing method of forward error.(3) In view of fold segment is rigid construction and monitoring of the most key parts, and is the most serious part disease occurs. So focused on the research of fold technology. Taking a continuous rigid frame (span combination:85m+160m*3+85m) for engineering background, through the chapter on the construction control technology, with large finite element software, establish the real bridge model "MIDAS". Through the simulation of different fold, compare and analyse deflection order changes, thus comparative analysis of various fold the influence law of deflection order, the comprehensive construction schedule and other factors, chose more appropriate fold order, verify the correctness of design fold order choice.(4) The temperature is the important factors influencing rocker. Through the different temperature analysis, folded pushing force and deflection of the change rule. Draw for pushing force and cooling temperature difference with linear relationship between temperature, the deflection is linear relationship for. Edge across pushing force needed in the span across and less than times across edge across the middle part, pier roof is the biggest part axial force. Times edge provent down across is the worst part, maximum scratching exceed 5cm. The results show that temperature is fold need to consider one of the important factors, should pay enough attention.