Study On Construction Method Of Regional Narrow Space Overpass City Center

With the rapid development of municipal engineering, construction work spaceconstraints by increasing phenomenon, construction project is increasingly popular in the citycenter area in narrow space, based on the background of Baoji Park Road overpass, related tothe specific process application solution space constrained conditions are studied.Pile foundation without solid mud choice of construction method, solves the mudSinotrans, pollution Road, venues and other environmental problems; also shortens the pileforming cycle; avoid safety risk of hole collapse; speed up the construction progress, reducethe space occupied area.Through rigorous stress check calculation of the premise, to cancel the previoustransverse lateral construction two rows of support, using steel pick bracket and littered withanti throwing net as the guardrail scheme, greatly saving support occupy space, in ensuringthe smooth construction of precondition of not affecting the normal urban traffic.Using a small portfolio template component instead of the traditional large-scale diescheme of arc external web box girder construction effectively solves the innovation,manufacture, transportation and installation of large steel formwork in the process to berestricted by the area brings many difficulties and inconvenience, also making web templatein the transition section and the installation process show more large steel mould shapingadvantages incomparable; greatly improve the turnover efficiency, simplify the constructionprocess, do not need a cable car, without the need to transport equipment dismantling, savingthe machine equipment, lifting equipment and avoids the influence of traffic.Due to the adoption of woven bags of sand preloading of traditional methods, needbagging, hoisting, uninstall, transport processes, not easy to realize in the narrow space, thisbridge adopts fast pre with water instead of sand as a counterweight pressing constructionmethod, flexible use of rich water resources, avoiding occupy the carriageway hoisting bringconstruction crowded, also accelerated the construction schedule.Because the comb shaped expansion joint has a great advantage in the amount ofexpansion, waterproof, dustproof, structural integrity and durability performance, combshaped expansion joint gradually become urban bridge favourite, but comb type expansionjoint should be strictly according to the process specification for construction in the process ofconstruction and installation, otherwise, after forming the road roughness, bridge expansionperformance is greatly reduced, practice has proved that the scientific process, the bridgeconstruction technology of success. Application of urban bridges lead rubber bearings, due to its high bearing capacity, highdamping, larger horizontal displacement and reset function, it can not only resolve thehorizontal earthquake action, and can withstand the vertical earthquake action. Themechanical properties is to ensure that the base isolation design can give full play to the effect,the use of isolation device set in one of the support and the energy consumption, greatlyreduce the use of space time, and achieved good results in narrow space.