Discussion on Superelevation Setting of Expressways Reconstruction and Expansion Project
In order to fully ensure driving safety and make full use of the existing project during expressway reconstruction and expansion projects,in this paper the principles for setting superelevation in reconstruction and expansion projects are summarized based on the characteristics of such projects,and the setting methods for circular curve superelevation and superelevation transition sections are explored.It is proposed to control the superelevation value of circular curves in reconstruction and expansion projects by using the lateral force coefficient so as to determine whether the current cross slope can be maintained.When the length of the existing spiral is insufficient,some superelevation transition sections can be arranged on straight lines to solve the problem that the length of the existing spiral is less than the length required for superelevation transition sections in reconstruction and expansion projects.By adding road camber lines to the superelevation transition sections in reconstruction and expansion projects,the problem of poor drainage in superelevation transition sections can be improved.The proposed design ideas have achieved positive results in some sections of the Beijing-Hong Kong-Macao Expressway and Shenyang-Haizhou Expressway reconstruction and expansion projects,and can provide reference for the design of superelevation and transition sections in other reconstruction and expansion projects.
expresswayreconstruction and expansion Projectcircular curve superelevationsuperelevation transition sectionlateral force coefficientdouble road camber
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