The combined force of wave and current is the key load to the foundation of the sea-cross bridge, which is directly related to the design scale. Local scour pits are quickly formed after the piers enter the water, so the influence of local scour pits on the wave current force should be taken into account. Typical bridge pier structure is selected as the research object by the project of Yushan Bridge. Physical model test was applied to research the wave current force on the current terrain. Through the application of Fluent -3D, the mathematical model was established, and the model was verified by the test results. By using the 3D mathematical model, the wave current force considering the bridge pier local scour was calculated to provide technical support for the design of the bridge.
In this paper, the relevant provisions regarding the classification, safety factor, strand anchor structure design and corrosion protection design are compared between the British standard BS EN 1537:2013, BS 08081:2015 and the Chinese national standard GB 50086-2015, the main differences of the strand anchor design are summarized, which can be used as reference for other strand anchor designers and researchers.
This test explored suitable flocculating settling technological parameter for dredge d sediment in Tongji Bridge Reservoir. It referred to sewage treatment plant's sludge treatm ent methods, and used PAM, PAC, FeCl 3 , MgCl 2 , Na 2 CO 3 , Ca(OH) 2 and KMnO 4 as floccula nts to improve water quality. Through single and mixed experiments, this paper studied floc culants' influence on sludge setting rate and supernatant liquor. The result shows that anioni c PAM's setting rate is faster than other flocculants, but its supernatant turbidity is high. T he effect of FeCl 3 , PAC, KMnO 4 is poorer than PAM, however they have better water purif ication effect. In view of sedimentation, argillaceous improvement and clarification, this pap er chooses three groups of flocculants, which are group two PAM+PAC+MgCl 2 , group three PAM+PAC+Ca(OH) 2 , and group four PAM+PAC+Na 2 CO 3 +Ca(OH) 2 . Therefore, this paper c an provide a simple and feasible way for the rapid dewatering of dredged sediment,which is convenient for sediment's disposal and resource utilization.
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