山区河流的洪水特点是来势猛烈,暴涨暴落,水量集中并往往携带大量漂浮物。由于漂浮物阻塞桥孔或冲击桥跨结构会造成桥梁被毁。我们管养的一座低水位木桥曾几次被毁。如1962年上游漂浮下来的大树杆插入桥跨内,经洪水作用好像撬棍一样竟将桥梁上部结构及排柱毁坏。鉴于这种情况,我们接受几次被毁的经验教训,根据该河流特点,试用防漂浮物网来保护桥梁,经三年来实践说明,这种防洪方法是有效 Floods in mountainous rivers are characterized by heavy flies, skyrocketing, concentrated water and often carrying large amounts of debris. The bridge is destroyed due to debris blocking the bridge or impacting the bridge across the structure. A low-water wooden bridge in our custody has been destroyed several times. As in 1962 the upper reaches of the floating tree bar into the bridge span, the role of the flood as a crowbar actually destroyed the bridge superstructure and column. In view of this situation, we have taken several lessons learned from the destruction and, based on the characteristics of the river, we tried out the anti-floating net to protect the bridge. After three years of practice, this method of flood control was effective