Rapid Maintenance Technology of BRT Platform Pavement Layer Based on UHPC Prefabricated Structure
In order to effectively lengthen the service life of the platform pavement layer of urban bus rapid transit(BRT)and improve the anti-fatigue performance of orthotropic steel deck slab,and also to satisfy the need for the un-interruption traffic,the composite bridge deck structure and assembly construction technology of orthotropic steel deck+short shear studs+prefabricated ultra-high performance concrete(UHPC)slab+TPO(thin-layer epoxy anti-skid pavement material)is proposed.Taking the BRT platform of Chengdu 2nd Ring Line Viaduct as the engineering background,the rapid maintenance scheme of BRT platform pavement layer is designed.The optimal scheme is determined by the finite element analysis,and the experimental section of BRT platform steel bridge deck maintenance is carried out.The finite element analysis results show that the 10 mm UHPC grouting material+50 mm prefabricated UHPC slab+10 mm TPO is the best scheme.The mechanical properties of shear stud and the anti-cracking performance of UHPC in the maintenance scheme meet the structural mechanical requirements,and have a large safe reserve.After the reconstruction,the fatigue properties of common fatigue sensitive details of the orthotropic steel bridge deck are significantly improved.Combined with the implementation of the test section,the maintenance and construction technology of urban BRT platform pavement layer is proposed,which includes four processes of prefabrication of UHPC slab,treatment of original pavement layer,installation of prefabricated UHPC slab and construction of wear layer and asphalt joint,which provides the theoretical and technical supports for the maintenance of similar bus platform pavement layers.
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