| Currently, the bridge construction process inevitably involves the construction ofthe water problem. Traditional water construction, generally in two ways: The first，fixed platform construction, such as building the island, the construction of steelcofferdam or anchor piles. This method is suitable for offshore workers closer orshallow flood, if applied to the deeper lakes, rivers, the technical requirements of theproject cost is too high and difficult to achieve.The second，floating ship constructionuse. This approach is used to bridge deep pile foundation construction costs are alsohigher, and there is not enough work positioning accuracy and stability is poor,affected by the storms larger issues. To solve these problems, in recent years the riseof the water construction consisting of steel pontoon bridge construction platform toaid the way.However, the current lack of specific projects for pontoon design, most ofthe use of the traditional multi-pontoon design, the bearing capacity, and stability cannot meet the high-strength pile platform construction. Thus, the urgent need for alarge water construction can be adapted to special steel pontoon design theory. In thispaper, this situation presents a large water platform dedicated pontoon design theory-integrated design. And applied Fujian Zhanghu Reservoir Water Bridge PileFoundation deepwater platform dedicated pontoon design, effective solution to thelarge-scale construction platform floating water problems. Built with a special waterpontoon platform will be fully expedite the construction progress and improve thequality of bridge construction. And after the completion of the works dedicatedpontoon modules can be reused for other projects to improve engineering efficiency.Meanwhile, the application of the new pontoon platform makes the project onconstruction of water reservoir Zhanghu environmental impact will be minimized.1. First the deficiencies of traditional fixed and floating water platform abovewater platform advantages can been analyzed，thus the floating platform is moresuitable for deep pile foundation construction， however, existing floating waterplatform they use versatile pontoon, unable to meet the high-strength engineering loadrequirements. In this paper, based on design specifications, direct calculation method,reliability design angle corresponding to specific projects proposed pontoon designtheory-integrated design.2. The integrated design method applied to the design specifications of Partpontoon overall design stage, an effective combination of "Steel design specifications","small river ship construction norms","Steel Quality Acceptance"advantage. Based Zhanghu Reservoir Bridge construction requirements of a singlestandard size requirement is9m×3m×1.5m dedicated pontoon design, has been themost reasonable size pontoon body member.3. The integrated design method of direct calculation method applied to verifythe cabinet part deflection. Using finite element analysis software ANSYS wholepontoon most dangerous conditions in the water side pontoons, end plate, bottomaxial deflection moderators keel node changes were calculated statistical analysis. Inorder to ensure the overall pontoon specification allows the maximum deformation isless than the value, making the pontoon stiffness to meet the design requirements.4. The integrated design method of direct calculation section applied to optimizejoint design. Pontoon connectors designed to connect the upper single-binaural pinconnection, the lower part of probucol hook connection. In this paper, the finiteelement analysis software ANSYS design dimensions of connectors for the contactanalysis. By applying a linear increase in the external load connectors to determinethe occurrence of the connector can withstand before yielding the maximum load.Analysis and calculation results show that the joint can withstand the maximum loadis much larger than the largest pontoon platform construction loads, joint strength canmeet the construction needs.5. Application of an integrated design method for reliability theory pontoonstructure reliability analysis. From the perspective of structural reliability, support forcross-section steel pontoons, non-support section, pontoon upper and lower single-pinconnection binaural hook plate welds Bingding reliability were analyzed. nd use thecenter of France’s first order second moment reliability calculation method of thecomponent in the design loads were calculated probability of failure. Analysis andcalculation results show that the overall reliability index value is far less than thedesign requirements, the overall structure of sufficient ability to resist risks. |
