The Key Problem Research In The Construction Process Of The Da Ning He Large Bridage

Steel truss arch bridge with the advantage of its beautiful shape , stiffness, long spanning capacity etc. , have recently been widely used in abroad. But for long span steel truss arch bridge,currently the documentation is rarely , steel truss arch bridge in theory and practice is insufficient system.On the background of the scientific research items"Daninghe Bridge in Wushan", a series of analysis for non-bracket cable-stayed suspension supporting methods as well as the closure means and Split cable way of Multi-ribbed steel truss arch bridge are pre- sented in this paper. The main subjects are summarized as follow:1.Based on large quantity of reference, paper looks back the development of arch bridages and paper introduces several suitable construction methods of arch bridage,2.the bridge of daninghe Project Overview is briefly introduced, summarizes the technical features of daninghe bridge and the main construction methods and construc -tion difficulties,3.Bridage as actual example which is characterized by long span;heavy weight of lift and erection;narrow site;and other problems in connection with construction tech -nology,Therefore cable erection system of heavy load under complicated geological conditions,the supporting system of long span multiply rib and section steel truss arch bridage and the system of lateral moving is Studied,4.For the daninghe bridage is made of many bars and belong to three-rib steel truss bridage,in order to improve the internal force and make the finial bridage linear close to the designed linear after the arch is closured。Therefor the scheme of"parts closure"is put forward,compared to the internal force and linear of the different schemes,reasonable construction scheme is determined at last,5.The construction method of cable-stayed suspension with multiply section and rib respective is adopted in daninghe bridage ,so many buckle-anchor cables will needed,there are different results to internal force and liners after closured when differents schemes of split cable is adopted,the researched of different scheme is carried out and reasonable scheme is determined...