公路改建中的老桥利用

On Existing Bridges Usage of Highways Rehabilitation

随着全国大范围的农村路网改造,原有桥涵等级低、承载不足、桥宽不够、线形不畅及老化破损,加之沿路建筑、河道的制约,老桥改造已成为道路改建的难点和关键。除常规的加固维修利用外,着重提出了便桥使用、借鉴学习、环境保护等新的利用途径和利用观点。对老桥利用从加强调查、安全第一、总体规划、结构验算等方面提出了注意事项。最后总结了老桥利用之对策。

With a large scale rehabilitation of rural road network in China,existing bridges rebuilding has become the stumbling block and key point for road rehabilitation because of lower existing bridge grade class,insufficient load,narrow bridge width,aging & damage and the restrictive factors by buildings and river tunnels along the road. In the paper,the new usage method and idea are put forward about temporary bridge usage,learning and environment protection,besides the usual strengthening and maintenance. Some cautions about investigation,safety first,general planning and structural calculation are presented. Finally,the countermeasures to the usage of existing bridges are summarized by the authors.