摘要
通过中山东和路雨水泵站设计实例,对室外排水设计标准下穿隧道泵站设计作出解读:论证第二道横截沟设置的合理性,从而采用“高水高排”、横坡与纵坡相结合的收水方式进行收水,可有效减轻洪峰隧道最低点的收水压力;对设计汇水范围的划定、重现期的选取进行研究讨论,提出新的地面集水时间计算公式。除此之外,下穿立交雨水泵站规模应预留20%的安全空间,以有效降低水泵开始的台数,减少运营成本。最终针对内涝校核的要求,通过建立SWMM模型分别对10 a、20 a、30 a重现期连续3 h降雨下排水系统的能力进行模拟分析。结果显示,隧道内均未出现积水情况。开启一台水泵可以应对一年一遇的暴雨,两泵并联运行可应对重现期为5~10 a的降雨,三台泵同时开启可满足内涝校核30 a一遇的强降雨。针对不同工况进行模拟设计,减少了相同暴雨强度下泵开启的台数与次数,降低了后续运营与维护的成本,对其他工程设计具有借鉴意义。
Through the design example of the rainwater pumping station in Donghe Road of Zhongshan,the design of pumping station in underpass tunnel according to outdoor drainage design standards is described, and the rationality of setting the second transverse ditch is demonstrated so as to adopt the collecting water methods of "high water level and high drainage" and the combination of transverse slope and longitudinal slope to collect water, which can effectively reduce the water collection pressure at the lowest point of flood peak tunnel. The delineation of the design catchment range and the selection of recurrence interval are studied and discussed. The new calculation formula of ground catchment time is put forward. In addition to this, the scale of rainwater pumping station of under interchange should reserve 20% safety space to effectively decrease the number of pumps for starting and reduce the operation cost. Finally for the requirements of waterlogging check, SWMM model is established to simulate and analyze the capacity of drainage system under continuous 3 h rainfall in10a, 20 a and 30 a recurrence intervals. The result shows that there is no water accumulation in the tunnel. One pump to be started can cope with a once-a-year rainstorm. The multiple operation of two pumps can cope with the rainfall with a recurrence interval of 5~10 years. Three pumps simultaneously to be started can meet the heavy rainfall with once-30-year waterlogging check. The simulation and design for the different conditions can decrease the number and frequency of starting the pumps under the same rainstorm intensity and reduce the costs of follow-up operation and maintenance, which has the referring significance for the design of the other projects.
出处
《城市道桥与防洪》
2023年第2期130-133,141,共5页
Urban Roads Bridges & Flood Control
关键词
下穿隧道
排水泵站
SWMM模型
工程实例
underpass tunnel
drainage pumping station
SWMM model
engineering example
作者简介
顾雨涵(1994-),男,硕士,助理工程师,从事市政给排水设计工作。
