Construction method of river channel concave bank scour prevention structure: Fid-Bau Portal

Construction method of river channel concave bank scour prevention structure

LI XIAOBING

The invention discloses a construction method of a river channel concave bank scour prevention structure. According to the method, a retaining wall is made on the bank side, rows of protruding tooth walls are arranged on the upstream face of the retaining wall, and a baffle sill and a bottom plate are arranged at the river bottom. The tooth wall is located below the flood level, the axis of the tooth wall inclines towards the downstream, the protruding height towards the river is 30-50 cm, and the upstream face is an inclined face. The baffle sill is arranged corresponding to the tooth wall, the axis of the baffle sill is perpendicular to the water flow direction, the height of the baffle sill is 40-60 cm, and the upstream face of the baffle sill is a straight face. The bottom plate and the baffle sill are connected into a whole, the bottom plate is flush with a river bed, and the transverse width of the bottom plate is 1/4-1/2 of the river bottom width. The tooth wall has a reflecting and guiding effect on coastal water flow, reduces scouring to the shore side, inhibits downward circulation of the water flow, and reduces scouring of a riverbed and wall feet. The baffle sill has an energy dissipation effect on water flow, can block large pebbles in a riverbed, and plays a role in stabilizing the riverbed and wall feet.

本发明公开了一种河道凹岸防冲结构的构筑方法。本发明的方法是在岸边做挡墙，在挡墙迎水面设置成排突起的齿墙，在河底设置消力坎和底板。齿墙位于洪水位以下，齿墙轴线向下游倾斜，向河中突出高度30‑50cm，上游面为斜面。消力坎布设与齿墙对应，消力坎轴线垂直水流方向，高度40‑60cm，上游面为直面。底板与消力坎连成整体，底板平河床，底板横向宽度为1/4～1/2河底宽。本发明齿墙对近岸水流有反射导流的作用，减少对岸边的冲刷，抑制水流向下环流，减少淘刷河床和墙脚。消力坎对水流具有消能作用，并可以拦挡河床中较大的卵石，起到稳固河床和墙脚的作用。

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