Research On The Key Construction Technology Of Steel Box Girder Of The Main Bridge Of Anhaiwan Super Major Bridge

Bridges are civil engineering buildings that require long-term service.Bridge engineering is the throat project in the entire highway network.Its safety directly affects the efficiency of transportation operations,and even directly affects the property safety and life safety of the people.Due to the special construction environment and the complicated structure of the Bay Bridge,the construction is very difficult.Therefore,it is necessary to carry out scientific design and analysis on the transportation,assembly and safety of the bridge structure during the entire construction of the bridge to ensure the safety and reliability of the bridge during construction and service,so as to maximize its economic and social benefits.Taking Anwan Bay Bridge as the engineering background,a comprehensive analysis is carried out from the perspectives of structural transportation,hoisting and installation,and the key links are studied by theoretical analysis,numerical simulation and on-site monitoring.details as follows:(1)The stability of the hull during the loading of a single 103m steel box girder by the transport ship is analyzed.The results show that the binding strength and the lateral force of the beam are in line with the hull stability requirements.(2)Establish a MIDAS simulation model to analyze the axial force,bending moment,torque and shear action characteristics produced by the steel-concrete joint section.Studies have shown that the joint section can smoothly and reliably transfer various loads,and the durability and fatigue resistance of the transition section meet Claim.(3)Micro-expanded fiber concrete is filled in the steel room of the bridge,and the steel box girder and the concrete box girder are tightly combined by prestressed short beams anchored at both ends of the steel box girder stiffness transition area and the concrete beam cross beam respectively.purpose.(4)A 3D visualization of the process of the steel box girder unit including the top plate,bottom plate,web,baffle,and arm unit was produced,and the production process of the large-segment steel box girder segments was visually reproduced.(5)The steel-concrete joint section is hoisted by first lifting the steel-concrete joint section steel beam.After precise adjustment,the steel frame is locked by the stiffness frame,the hanging mold is installed,the binding steel bar and the prestressed pipeline are positioned.(6)The large sections are transported to the bridge position,and the large sections are lifted to 0.5m away from the bottom plate of the joint section by using jacks.It guarantees the precision control of the smooth hoisting of large sections and the smooth docking of the interfaces at both ends of the steel-concrete joint section.