Ⅵ、挑坎防护浅基桥涵冲刷在公路建筑中,为了降低小桥涵造价,常常缩短桥孔长度,压缩自然水流断面,以致桥涵出口流速大多超过出口河床的自然流速而造成出口河床的冲刷。对浅基小桥涵,为保证桥涵和路基的安全,多对桥涵下游出口河床的一定长度范围进行铺砌加固以防冲 Ⅵ. Pick-up Protection Shallow Bridges and Culverts Scouring In highway construction, in order to reduce the cost of small bridges and culverts, the length of bridging holes is often shortened and the natural water flow section is compressed. As a result, the outlet velocities of bridges and culverts mostly exceed the natural velocities of outlet river beds and cause erosion of the outlet riverbed. For shallow foundation bridges and culverts, in order to ensure the safety of bridges and culverts and embankments, more bridges and culverts downstream of the length of the outlet river bed should be paved and reinforced to prevent impact