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Zhaoqing Xijiang Bridge Main Bridge Extension Project Design

⑤ the crash requirements. To be adopted very stiff hollow pier. Lower elevation corresponding reduction in the bridge pier height, structure calculation on the pile foundation Shouli Bu Li. Finalize the same old and the new bridge deck elevation. 2.4 The box beam superstructure Box Single straight single abdominal cross-section. Roof width l2.5m. Bottom width 6121, the bridge sulfur slope (two-way 2%) by the public aysAutom and otive Highzc shipped cations200 first 2q steam Appli coral -4 months. Adjustment on the roof. Box roof, floor, the thickness of the web. Reference to other types of bridges with the advantages and disadvantages. In light of the actual situation of the bridge,[link widoczny dla zalogowanych], from the force, structure,[link widoczny dla zalogowanych], construction and other aspects of comprehensive comparative analysis, determined using the following parameters: girder section at the top of the main Pier height 81TI, cross-sectional height of 28m. Roof thickness 25cTI1, web thickness 40 ~ 60cm, Bottom 100cm thick roots from the box in a gradual change to cross-30cm, Box of beam and base plate thickness at the second parabola. Cambodia and the use of vertical prestressing steel vertical prestressed two-way combination of crude steel prestressing system. Cambodia can choose to use the standard prestressed steel strength 1860MPa of 15.24mm high strength, low relaxation steel hinge line, prestressed thick steel for strength of 750MPa using standard 25 thick cold drawn steel bar grade Ⅳ. Longitudinal prestressing steel beams placed on the roof, floor and the web, using flat, vertical, curved at both ends of the combination method of tension. Vertical prestressed reinforcement layout in the web of crude within, to reduce the principal tensile stress, the use of unilateral tension. Meanwhile, to prevent the use of stage near the bridge have a vertical crack web. Requires roof cross bars and pavement reinforcement fabric appropriately strengthened. 25 bored piles used in all the lower part of the basis of structure,[link widoczny dla zalogowanych], in order to avoid the construction process on the old bridge vibration interference. Requires drilling into the swing drill holes. Each main pier pier located four 3000him bearing piles, pile cap thickness of 4m, the top elevation of pile cap and the old bridge was flat. Use hollow pier pier, the main considerations: ① According to hydrographic survey data, low water level elevation of 028m, the design navigable water level elevation 13,61 m, height 13.33m, not entirely by the cap to resist the impact of accidents passing ships. ② ship impact force P as theory and method of calculation more,[link widoczny dla zalogowanych], according to \= 616t), damaged hull energy method (P: 420 ~ 840t) and Worthing summary of theory and empirical formula GKSS test (P = 1700 ~ 5100t), the results obtained vary widely, and the final reference to the Humen Bridge Auxiliary Luoxi Bridge channel using the impact force P and the passage of vessels between the ratio of displacement w, determine P as follows: H Transverse to trespassing 1 = 0.225W = 450t; along the bridge to H2 = 0.78 'Hntl = 350t. Where w value at 2000t. ③ common double Slender Piers, the degree of the overall cut small, can reduce the pile of the eccentric force. But can not meet the crash requirements. Should not be used. ④ hollow pier wall, the impact area of the vessel to be used in Transverse Direction 1.3m, along the bridge to 1.0m, the impact area in the non-vessel may be appropriately reduced, and thus reduce the pier as a whole drama degree to to reduce the pile by the force of eccentric purposes. 3 Conclusion on G324 line Zhaoqing Xijiang Bridge Extension Project summary of the main bridge design shows: 1) the expansion of the bridge to ensure the safety of the old bridge, taking into account the coordination of the old and new bridges and waterways and water requirements. 2) the need to study a number of key technologies, to provide scientific and technical design support to design technology platform management, economic, and reliable. 3) With the continuous deep geological survey, based on geological data obtained continuously revise and improve the design, particularly for complex local geological conditions, the need for comparative analysis of local programs to improve the overall design. 4) information on design specifications and provide reference data, can not die to move rigidly applied, depending on the actual situation to investigate, analyze, judge, to value scientific and reasonable. 5) Bridge design, selection of appropriate combination of structural systems, both integrated into the merits of different structural systems, but also to varying degrees, to overcome their own shortcomings.
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