市政排水管网中大高差跌水井的设计

Design of Large Height Difference Waterfall Well in Municipal Drainage Pipeline Network

摘要:

通常情况下水系不发达的平原地区由于缺乏受纳水体，市政雨水排放需长距离转输，导致市政排水管道容易形成大高差跌水。结合工程案例，阐述利用现有顶管工作井，制定可行的市政管网大高差（10.90 m）大流量（11.04 m³/s）跌水消能方案，并设计有效的落差连接构筑物。同时采用ANSYS Workbench 2022 R1平台建立工作流，实现多软件交互式、参数化建模并进行求解，以模拟验证跌水井的消能效果。模拟结果表明：在对顶管工作井内部构造进行跌水消能改造后，消能效果优良，适用于解决大流量、大高差的市政雨水主干管跌水问题。案例成果可为类似跌水工况提供参考方案。

Abstract:

Under normal circumstances, in plain areas with underdeveloped water systems, due to the lack of receiving water bodies, the municipal rainwater discharge needs to be transferred over long distances, which leads to the formation of large height difference waterfall in municipal drainage pipes. Combined with an engineering case, the existing pipe jacking shaft is adopted to formulate a feasible energy dissipation scheme for large height difference (10.90 m) and large flow rate (11.04 m³/s) waterfall of municipal pipeline network, and the effective drop connection structures are designed. At the same time, The workflow is established by using the ANSYS Workbench 2022 R1 platform to realize the multi-software interactive, parametric modeling and solve it, which simulate and verify the energy dissipation effect of the waterfall well. The simulation results show that the energy dissipation effect is excellent after the internal structure of the pipe jacking shaft is reconstructed for waterfall energy dissipation, which is suitable for solving the the waterfall problems in the main municipal rainwater pipes with large flow and large height differences. The findings from the case can provide a reference for similar waterfall conditions.