全地下式污水处理厂地面排水系统设计探讨

Discussion on Design of Ground Drainage System of Fully Underground Wastewater Treatment Plant

摘要:

针对丘陵地区全地下式污水处理厂场地竖向复杂、山体汇水影响显著、地下箱体顶板防渗要求高等问题，结合一处工程实例，开展景观水系与地面排水系统、顶板防排水体系及海绵城市一体化设计研究。工程采用地下为构筑物箱体、地上为景观公园的建设模式，依托场地高差构建以再生水为水源的瀑布溪流景观；通过截洪管疏导周边山体来水，采用找坡层、排水板及排水管的组合构造解决地下顶板排水难题；根据场地地形合理利用海绵设施，实现管控目标。工程将景观水系与雨水转输调蓄系统耦合，在保障排水安全与结构防渗的同时，显著提升生态效益与经济性。研究成果可为丘陵地区全地下式污水处理厂地面排水、顶板防渗漏及海绵城市协同设计提供参考与借鉴。

Abstract:

In response to the problems such as complex vertical site of fully underground wastewater treatment plants (WWTPs) in hilly areas, significant impact of mountain water convergence, and high anti-seepage requirements for the roofs of underground tanks, combined with a practical engineering case, the integrated design of landscape water system, ground drainage system, roof drainage and waterproofing system, and sponge city is studied. The construction modes of the project are the structure tanks in the underground and the landscape parks on the ground. Relying on the height difference of the site, a waterfall and stream landscape with reclaimed water as the water source is constructed. The flood-intercepting pipes are used to divert the water from the surrounding mountains. The composite construction of sloping layer, drainage boards and drainage pipes is used to solve the difficulties of underground roof drainage. Based on the site terrain, the sponge facilities are reasonably utilized to achieve the goals of management and control. The landscape water system is coupled with the rainwater conveying storage system in the project. At the same time to guarantee the drainage safety and structure seepage-proofing, the ecological benefits and economic efficiency are remarkably enhanced. The research achievements can provide the references for the collaborative design of ground drainage, roof seepage prevention and sponge city of fully underground WWTPs in hilly regions.