摘要
在城市通航河流上,通航净空尺度为桥型方案选择需考虑的一个关键因素,在净空宽度不大的情况下桥墩尺寸和形状对通航方面的制约尤为明显。该文通过某新建桥梁桥区河段二维水流数学模型试验,分析不同桥墩结构形式对通航水流条件的影响。结果表明:对方形墩倒角的优化形式可以减小通航水域内的横向流速;桥墩尺寸越大,通航水域范围内的横向流速越大;同宽度的圆头墩结构对应的通航水域范围内横向流速最小。试验研究成果可有效解决城市通航河流上桥梁通航与景观打造的矛盾,为桥梁建设方案提供了多样化的选择。
The navigable clearance scale is a key factor to be considered in the selection of bridge type schemes on urban navigable rivers,especially in the case of limited clearance,the restriction of pier size and shape on navigation is obvious.In this paper,the impact of different pier structures on navigable flow is analyzed through the two-dimensional flow mathematical model test of new bridge section of a river.The results show that the shape optimization of square pier chamfer can reduce the transverse velocity of navigable waters;and the larger size of pier,the greater transverse velocity of navigable waters.Furthermore,the transverse velocity of the navigable waters is the smallest on the condition of the same width but round form of head pier structure.The test data can effectively solve the contradiction between bridge navigation and landscape construction on urban navigable river,and provide a variety of options for bridge construction.
作者
何传凯
HE Chuankai(Datang Hydropower Science & Technology Research Institute Co., Ltd, Chengdu 610031,China)
出处
《广东水利水电》
2020年第7期73-77,共5页
Guangdong Water Resources and Hydropower
关键词
桥墩结构
横向流速
二维水流数学模型
通航水流条件
pier structure
transverse velocity
two-dimensional flow mathematical model
navigable flow conditions
