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有一些新建或改建公路在通车一段时间以后,会出现不同程度的桥头跳车现象,给行车带来一定的不便。根据观察和分析,笔者认为是由以下几个方面产生的: 一、在设计方面,桥涵构造物跨径过小 (1)在勘察设计时,由于受经费的限制,不得不压缩孔径,大河面、小跨径桥涵较多,有些桥涵的跨径甚至达不到河面宽度的1/2,在桥头填土时,基层土又不作处理,即使填土的质量较好,但其基层还是设在淤泥层上。 (2)水泥混凝土路面的胀缝设计不
Some new or reconstructed roads open to traffic some time later, there will be varying degrees of bridge jumping phenomenon, to bring some inconvenience to traffic. According to the observation and analysis, the author thinks it is produced by the following aspects: First, in the aspect of design, the span of bridges and culverts is too small (1) In the survey and design, due to the limitation of funds, , There are many bridges and culverts with small span and some bridges and culverts span no more than 1/2 of the width of the river. When filling the bridge, the grassroots soil is not treated. Even if the fill quality is good, the grassroots level is still at Silt layer. (2) Expansion joints design of cement concrete pavement not