Tied Arch Bridge Construction Key Technology Optimization Research

With the wide, the domestic first applied dividing isolation support technology of qin and handynasties in shaanxi road ba river bridge (arc bridge) as the background, study of commonly usedtechnology to optimize key bridge construction. The specific research content is as follows:In view of the fact that in recent years, frequent earthquakes, engineering field pays more and moreattention to the seismic design, this bridge adopts isolation systems (pier adopts a double lead rubberbearing and basin type rubber support component separation type isolation system, pier using fluid viscousdamper as a damping system) and the combination of multiple kinds of seismic measures, effectivelyreduce the section size piers, the reasonable to reduce the cost of high earthquake intensity area of bridge.Midas software is adopted to establish the support3d spatial analysis, simulation, design and checkingcalculation of finite element model. In the traditional support system with strong stability, goodcompatibility, wide adaptation module type steel support, forming a set of practical construction universalchangeful steel support system, greatly increase the stiffness, strength and stability of the support system,solved the large span, high structure, the structure of the complex terrain conditions falsework.Through self balancing technology bearing capacity test, and found that after grouting pile foundationbearing capacity than the38.1%increase≦grouting pile foundation bearing capacity. After groutingconstruction technology obtained the affirmation, post pressure grouting pile foundation under thecondition of the lower pile length and pile diameter, effectively guarantee the bearing capacity of pilefoundation, also provides the general late pile foundation quality defect repair from the methods andprocessing technology.There has always been in long-span prestressed concrete structure construction beam, tension andgrouting technology is hard to control. This cooperate artificial wear beam bridge crane, hoist, secondtensioning process to ensure a long stretch values conform to the requirements of the specification, throughcontrast test, choose finished grouting materials to replace the conventional grouting slurry, has obtainedthe good effect of construction.In arch foot betting concrete construction, under the bridge arch foot part directly into concrete,vibrating rod vibration, on both sides of the arch foot above part only betting the first under the rod, other parts don’t bet, make steel arch their center of gravity is reduced, and the erection of steel pipe scaffoldfixed injection pipeline construction methods effectively guarantee the construction safety and ensure theconstruction quality.Changed the original design in the construction of three period of lifting scheme, using five sectionprocessing, production and assembly technology, the successful completion of the construction, made inlifting weight, lifting span, lifting height of greatly improving the bold attempt in the field of engineeringexperience, has become the a breakthrough in the field of hoisting construction work.