Conceptual Design of Aqueduct over Main Navigation Channel of Pihe River:A Portion of Changjiang River Diversion Project to Feed Huaihe River
The navigable aqueduct over the main navigation channel of Pihe River is a portion of the Changjiang River Diversion Project to Feed Huaihe River,which carries about 40 thousand tons of water.As the water carried by the aqueduct varies in dry and flood seasons,the aqueduct is subjected to super-class varying heavy loads.The critical issues that must be addressed in the conceptual design include the vertical stiffness and displacement of the bridge,torsional resistance of trough girders,stability of the excavation-behind-construction slopes,and foundation displacement.Featuring the arch-truss superstructure,the aqueduct has two separated decks,to effectively control the deflection and upwarping of the structure and better resolve the varying of the vertical stiffness and displacements of the structure.There are two arches and M-shaped lateral bracings beneath the U-shaped trough girders,the trough girders are actually not connected at the arch crown,while the arches are integral arches,to effectively control overturning and compressive deflection and resolve the lateral deformation and torsion of the trough girders.The trough girders have corrugated webs which are supported on the trusses via pendulum-type support plates,aiming to resolve the force transfer between the water conduits and aqueduct,temperature difference between water and steel,as well as the liquid-solid coupling of water and aqueduct,and hydraulic tests were conducted to verify the vibration suppression effect on the bridge.To ensure the stability of excavation-behind-construction slopes and mitigate foundation displacement,the soil was excavated in stages.Diversion islands,lookouts,and watchtowers are built to make the aqueduct aesthetically pleasing.The water-filling test proved that the structural condition of the bridge is sound.
girder-arch composite structureaqueductsuper-class varying heavy loadcorrugated plateconceptual designlandscape designbridge constructionwater-filling test
万方数据
维普
