基于“保险丝”概念的组合摩擦型路桥防超载装置设计

Design of Road and Bridge Anti-overload Facility for Combined Friction Based on the Concept of“Fuse”

针对当前车辆超载造成路桥损伤等问题,提出了路桥“保险丝”概念,设计了一种组合摩擦型路桥防超载装置,实现对超过路桥允许通行荷载值的车辆自动识别和限行功能。该装置由台座、滑块组、限位复位装置和报警装置组成。通过车辆和本装置共同形成的平衡力系实现自动判别超载车辆;过载车辆通过时,滑块组产生联动滑移,右滑块抬升,从而限制超载车辆的通行;限位复位装置分别控制滑块组滑移速度和恢复滑块组原始位置,保障车辆安全和装置运行。分别给出车辆整车超载极限平衡工况、超载滑移平衡工况、千斤顶顶升复位工况下滑块的受力状态简图,建立滑块组平衡方程。给出基于路桥限载值的本装置设计方法和算例,并提出本装置的测重精度控制措施。

Aiming at solving the problem of road and bridge damage and frequent accidents caused by vehicle overload,which always lead to serious loss of people’s life and property,the concept of road and bridge“fuse”was proposed in order to maintain the safety and normal service of roads and bridges,the road and bridge anti-overload facility for combined friction was developed.It can realize the functions of automatic identification and restriction of vehicles exceeding the allowable traffic load of roads and bridges.The facility is composed of platform,slider group,limit reset device and alarm device.Automatic identification of overloaded vehicles is realized through the balance force system formed by the vehicle and the facility;when the overload vehicle passes through,the slider group produces linkage slip,and the right slider lifts,so as to restrict the overload vehicle’s passage;the limit reset device controls the sliding speed of the slider group and restores the original position of the slider group to ensure vehicle safety and facility operation.The stress state diagrams of the sliding blocks were provided respectively under whole vehicle overload ultimate equilibrium condition,overload slip equilibrium condition and jack jacking reset condition,and the balance equations of the slider group were established.The design method and case of the facility based on the load limit of roads and bridges were given,and the weight measurement accuracy control measures of the facility were put forward.