无梁板桥在超浅埋隧道下穿省道中的应用

超浅埋隧道在下穿繁忙的公路时,最常见的方法是将公路改移后采用明挖施工,隧道明洞完成后回填,但是如果公路上跨超浅埋铁路隧道后直接下穿另一条新建铁路,两条新建铁路与既有铁路之间的交叉限制了道路从周围的永久性改移,道路改移只能是属于临时过渡工程,最后还需将公路改回原位,考虑超浅埋隧道下穿省道采用明挖法所占用省道的时间较长,且临时改移道路影响另一条新建铁路的建设,而且公路局要求在一个半月左右的时间必须恢复正常通车,占用公路时间很短。经过综合考虑采用无粱板桥上跨超浅埋隧道的方案较为合理,既节约省道的开通时间,又能保证隧道贯通工期。

When an ultra-shallow tunnel runs through a busy highway,the most common method is to use open-cut construction after the highway is relocated,and the tunnel is backfilled after the tunnel is completed.But if the highway crosses the ultra-shallow railway tunnel directly through another newly-built railway,the intersection between the two new railways and the existing railway limits the permanent relocation of the road from the surrounding,and the road change can only be a temporary transition project,and finally the highway needs to be changed back to its original position.It is considered that it takes a long time for the ultra-shallow tunnel to pass through the provincial highway,and the temporary change of the road affects the construction of another newly-built railway,and the Highway Bureau requires that it must be restored to normal traffic in about one and a half months,occupying the highway for a short time.After comprehensive consideration,the scheme of crossing the ultra-shallow tunnel on the beamless slab bridge is more reasonable,which not only saves the opening time of the provincial highway,but also ensures the construction period of the tunnel.