Cofferdam and construction method thereof

The invention relates to a cofferdam and a construction method thereof, according to the cofferdam and the construction method thereof, the river bed can be protected from being impacted by spiral flow by paving and filling the filler on the river bed at the first weir wall, and then the embedding depth of the first weir wall is kept. In addition, due to the fact that the filler is surrounded at the bottom in the throwing and filling space by the first weir wall and the second weir wall, the filler is not prone to being scattered by violently-changing water flow, the using amount of the filler can be reduced on the premise that the same anti-scouring effect is achieved, and the influence on the aquatic environment is reduced. 本发明涉及一种围堰及其建造方法，所述围堰及其建造方法通过将所述填料铺填于所述第一堰壁处的河床上，能够保护河床避免螺旋流的冲击，进而保持所述第一堰壁的埋入深度。此外，由于所述填料被所述第一堰壁和所述第二堰壁围在所述抛填空间内的底部，所述填料不易被剧烈变化的水流冲散，在实现相同的防冲刷效果下，能够减小填料用量，并降低对水生环境的影响。