Bridge Deck Drainage Design Theory And Optimization Measures Based On Road Safety Theory

Traffic safety problems was brought by hydrops of road of bridge ore and moreprominent, followed by followed by the study of safety theory and surface drainage ofbridge.This article has Investigation and analysis the drainage design of the road ofbridge, arrive at the width of road shoulder wasnot enough, longitudinal slope too smalland the assign for drain opening of bridge deck is unreasonable, puts forward theimportance and particularity of bridge deck drainage.First of all, the paper analyzes hydrops of road of bridge influence on adhesioncoefficient, It is concluded that hydrops will reduce Tire and road adhesioncoefficient.Then analyzed the mechanism of automobile tires water skiing, and whenthe car water skiing was deduced the relationship between the critical water filmthickness and the speed of the formula, obtained its water skiing critical water filmthickness under different speed. In addition, considering the influence of the coefficientof viscosity of water, to derive the calculation formula of bridge deck water filmthickness under rainfall condition, and based on this formula, the analysis of theinfluence of the bridge deck transverse slope, bridge longitudinal slope and lane numberof water film thickness size, it is concluded that the water film thickness t road of bridgethicker with the increase of the longitudinal slope and lane number, with the increase ofbridge deck transverse slope thinning.Again, using numerical analysis method for road of bridge drain openingintercept rate, simulated and analyzed and studied the deck drain opening form, road ofbridge transverse slope and the influence of road of bridge longitudinal slope tointercept rate. Came to the road of bridge transverse slope increases its intercept rateget bigger, the deck longitudinal slope will increase its intercept rate decreases, and thesize of the rectangle in the length and width of discharge opening and withholding rateis proportional relations. Considering the length of the discharge opening of lateral flowintercept, empirical formulas for the correction.Finally, based on the theory of vehicle water skiing, bridge deck drainage designwere presented in this paper, the lane on the right side of the right edge of the water filmthickness shall not exceed the critical water skiing speed control indicators. And putforward the use of bridge deck shoulder set open channel ditches and bridge deck drainopening composite bridge deck drainage system is conducive to the optimization ofbridge deck drainage measures, etc.