在高交通流量下砼的修补是公路养护部门的一大难题。
Concrete repairs under heavy traffic flow remains a difficult problem in highway maintenance.
与此同时，公路养护工作成为了公路管理部门的重要工作之一。
At the same time, highway maintenance work has become one of the important works of road management department.
桥梁伸缩装置的破损程度如何评价，如何养护维修，是公路管理养护部门急需解决的问题。
But how to estimate and maintain the bridge expansion joint is an urgently problem to be solved by the manage department of the highway.
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