The Research Of Construction Monitoring Technology In Brackets And Steel-pipe Piles Of Cast-in-site Girder Bridge

High-speed railway is developing rapidly in our country, after years ofunremitting efforts, at present, China is the world’s fastest growing and most completesystem technology of high speed railway, ability to integrate the strongest and longestrunning mileage, maximum operating speed, and the largest country in theconstruction scale. Due to the fast speed of high speed railway, in order to make thetrain run smoothly, using bridges across rivers and roads. Railway long-spancontinuous girder bridge construction method has many, but the support cast-in-placemethod for its construction speed is quick, short time limit, standardized operation,etc, are still widely used. But at the same time due to the construction process of allkinds of accidental factors, ignoring the importance of monitoring in the constructionprocess, and combined with the construction quality and quality inspectionmanagement system is imperfect, caused many scaffold collapse, caused manyunnecessary casualties and property losses, so need to study and analysis ofconstruction monitoring technology, in order to avoid a repeat of similar events.Based on the Beijing-Shanghai high-speed railway Hanzhuang canal bridgeacross the river of48m+80m+48m continuous cast-in-site concrete beam as thebackground, to illustrate concrete cast-in-place beam bracket construction schemedesign, stress analysis and construction monitoring scheme design and numericalanalysis methods, such as analysis process.The project schedule is tight, so choose the full framing method for theconstruction, but due to cross the river perennial don’t stop, at the same time, theBeijing-Shanghai high-speed railway as the double-track railways, the beam bodyweight is bigger, bailey beam could not afford such a heavy load, so the steel pipe pileplatform is adopted by engineering plan will choose after foundation to across theriver, as the base bowl buckle stents. To test the rationality of this solution, andprovide theoretical value for the construction monitoring, ensure engineering safetywas completed on schedule, and for later similar engineering provides referentialsolution, in this paper, the bowl bracket and the stress of the steel pipe pile platformare analyzed, the main work and research results were as follows:（1) Combined with specific engineering cases, after scheme comparison, selectthe steel pipe pile platform based support system schemes for the bowl and the construction, and the whole process of the project construction method has carried onthe detailed arrangements;（2) The support system, respectively, the stress check computation andnumerical simulation analysis, the theoretical value is obtained under each workingcondition of the construction and monitoring provides a reference for construction,and probes into the support system weakness parts, can undertake system andmonitoring based on the reinforcement, ensure the safety of the construction;（3) According to the scheme and the results of numerical analysis, compiled asupporting system for the whole bridge construction monitoring schemes, this schemecan provide theoretical guidance for the construction of similar projects in the future.