Reduce repair cost of wastewater pipelines for using trenchless and open cut technology

Abstract

In this research, a new method named minimal pumping (MP) method has been proposed. In this proposed method, the required time for damaged pipe repairing is minimized using up stream pipes and manholes capacities, and therefore pumping cost required for diversion is reduced. Generally, wastewater bypass is necessary for repairing the wastewater pipelines using some trenchless repair methods. As a result, upstream of the damaged pipe is plugged with plug and packer and the wastewater is pumped to downstream of damaged pipe. If repair time is long, bypassing would be very expensive and therefore, here, the MP method is proposed in which it significantly reduces the repair cost. In this research, as a case study, the wastewater pipelines of Mirzakouchek Khan Boulevard in Isfahan and wastewater network of Ardekan city are selected to apply the proposed method. Furthermore, in the second case study, the effect of repair time duration and starting time of repair in real condition are also studied using the extended period condition for analyzing. The results show the compatibility of the proposed method in reducing the repair costs of underground wastewater pipelines in urban areas. In other words, the required pumping time and related cost is reduced 70 to 85% and 70 to 100% for Mirzakouchek Khan Boulevard and Ardekan city wastewater network, respectively, using the proposed method.

Keywords

• Wastewater network
• Repair and rehabilitation
• Trenchless method
• Bypass discharge
• Repair cost