The world's largest span partially anchored hybrid girder cable-stayed bridge was successfully completed
April 18, 2023
20 August 21:30，With the completion of the hoisting and matching of the non-axial force connecting device in the middle of the bridge span,，It is invested and constructed by Hubei Trading Company.、The world's largest span partially earth-anchored hybrid girder cable-stayed bridge constructed by CCCC Second Harbor Engineering Co., Ltd.——Ten（Weir）Xi（Chuan）High speed（Hubei section）Danjiangkou Reservoir Bridge runs through the whole line，To lay a solid foundation for the opening conditions of Shiyi Expressway at the end of the year。
The Danjiangkou Reservoir Bridge is a key control project of Shiyi Expressway.，It is located between Liangshuihe Town and Longshan Town, Danjiangkou City, Shiyan, Hubei Province.，One is across the Danjiangkou Reservoir, the water source of the Middle Route of the South-to-North Water Transfer Project.，The total length is 1076 meters，The main span is 760 meters，Adopt the standard construction of two-way four-lane expressway，The design speed is 100 kilometers per hour。
The main girder of the bridge is a new type of steel.-UHPCLight composite beam form，That isUHPCThe layer is combined with the steel box girder，Has that function of structural layer and bridge deck pavement，The rigidity of the bridge deck can be increased，Reduce the dead weight of the structure，But also can solve that problem of easy damage and fatigue cracking of the traditional steel bridge deck pavement lay.，This is also the first application in cable-stayed bridges with a main span of more than 700 meters.。
The composite beam is divided into 9 types.，48 segments，The maximum hoisting weight is 451.8 tons。March 30, 2022，Hoisting of head beam in the middle span of bridge startup，During this period, in order to overcome the difficulty of beam hoisting,、Strict control standards、High security risk and so on.，The project team works out a special construction plan、Invite academicians and experts to review and guide、Introduction of intelligent site monitoring system independently developed by enterprises、Regularly organize on-site coordination meetings and other ways to ensure the smooth progress of construction safety。
Installation of the world's largest non-axial force connection device in the middle of the bridge span，It is the last important process that runs through.。The device includes two segmental steel girders.，Single segment length 6.7 meters，Width 31.6 meters，Comprises four guide beams to form a steel beam stress support system，South、The segments on the north bank weigh 431 respectively..8 tons、425.5 tons。The device has active adjustment and locking functions.，Like a spring that expands and contracts actively.，Assist the main girder of the bridge to better cope with various forces“Containment”，Releasing the axial force and longitudinal deformation of the main beam，Meet the requirements of beam end displacement and speed limit under dynamic state，And that device has high durability.、And is convenient to maintain and overhaul，The reliability and service life of the bridge structure are greatly improved.。
The device has large hoisting weight.、The construction process is complex，The installation accuracy directly affects the operation quality and structural durability of the whole bridge.。For this reason，The project team has carried out many investigations on the site construction conditions and the location of the hoisting position.，Combined with local continuous high temperature and other adverse conditions.，A detailed special construction plan has been formed.，It is determined that the north bank side segment shall be matched and fixed with the adjacent beam segment first.，Temporary connection between south bank side segment and adjacent beam segment，After connection of two segmental guide beams，Adjust and fix the construction method of the south bank side segment，Ensure high-precision connection of guide beam at millimeter level，The bridge was successfully completed.。
As an inter-provincial fast passage between Hubei and Henan running through the north and south,，After the completion of Shihe Expressway，It will not only connect the Three Gorges Reservoir area in series.、Danjiangkou reservoir area、Shennongjia、Five scenic spots including Wudang Mountain and Laojun Mountain in Luoyang, Henan Province，Promote the rapid development of regional eco-cultural tourism industry along the line.，Green road for the benefit of the people along the line、Tourist Road、The road to prosperity，It also further improves the construction of expressway network in Northwest Hubei.，Continuously strengthen the advantages of Hubei automobile industry，Enhance industrial concentration，Build to“Han filial piety with Xiang ten”Focus on the trillion-level automobile industry corridor，It is of great significance to build a national automobile production base.。
