Research On The Key Constructing Technology Of The Bowstring Arch Bridge In Xi-Gan Railway Across The Danla Highway

Nowadays,with the development of traffic and transportaion more and more tied arch bridges appear.The reason is that the tied arch bridge is elegant in shape and meets t he aesthetic requirement of the modern people.The high bearing capa city can meet more and more complex engineering,and the tied arch bridge can achieve larger span.In addition,the modern steel reinforced concrete technology makes the tied arch bridge co ntinuous improvement of reinforced concrete technology,the structure of arch bridges is beconing more and more complicated.The large number of construction of tied arch bridge requires more in-depth study of its structural combination intemal force charact eristics and soon.At present scholars at home and abread have done a lot of research on tied arch bridge.On the basis of this,combined with practical engineering examples,this poper systematically studies tied arch bridge from tow aspects of design and construction.The bridge studied in this poper is a through type arch bridge.The span of the bridge is 64 meters and the length of the beam is 65.4 meters.For its man girder,the box type concrete structure is adepted,and the cross section is a double box structure with equal height.The first part of the arch of the foot arch,finite element analysis,the bearing capacity and stability to meet the requirments of the bridge;Secondly the scene friction and anchor mouth,bell liss experiment,obtained friction coefficient,ensure the prestress to meet the design requirements;The tied arch bridge static and dynamic load test,the whole bridge yast a higher,meet the requirement of design.Finally,the adyustment of the cable force is carried out,and the test results show that cable force of the bridge reachs the allowable range of the design valus.The paper mainly studies the structure internal force and stability of the bridge,including cable force optimization,arch foot analysis,three-dimensional stability analysis and lateral stress analysis of arch rib.The internal force field of the bridge is calculated and analyzed by means of numerical simulation software and model test.The design scheme is proposed and the construction suggestion is gien.