一、概述 小桥涵出入口铺砌,虽在铁路建设中不是主体工程,但小桥涵数量甚多,如铺砌标准过高,则增加工程投资;如铺砌标准过低,则易被洪水冲坏,增加养护维修费用。因此,合理地决定小桥涵出入口铺砌,也是铁路建设中不容忽视的问题。 I. Overview Bridge entrance and exit of paving, although the railway construction is not the main project, but a large number of small bridges and culverts, such as paving the standard is too high, then increase the project investment; such as paving the standard is too low, it is easy to flood damage and increase conservation Repair fees. Therefore, it is also a problem that can not be neglected in the railway construction that a reasonable decision is made for the entrance and exit of bridges.