Combining Traditional Tunneling with Curved Microtunneling During Construction of the Doan Valley Relief and Consolidation Sewer

摘要

The Doan Valley Relief and Consolidation Sewer (DVRCS) is a combined sewer overflow control project in Cleveland, Ohio, with a $12.92M final construction value. The project required the installation of over 3,161 linear feet (LF) of 72-inch inside diameter (I.D.) trenchless sewer. Triad Engineering and Contracting, the Prime Contractor, installed most of the tunneled pipe using traditional open-face TBM methods. Triad’s subcontractor, Super Excavators, Inc. installed about 1,200 LF of the tunneled pipe using curved microtunneling methods. Triad’s contracting team was able to choose highly efficient construction methods due in part to flexibility provided in the bid documents. However, schedule constraints, difficult ground conditions (including boulders) and concerns of the City of Cleveland had to be overcome by the construction and design teams to complete the project. This paper highlights the successful completion of the project, including several challenges which the Contracting team overcame to complete the trenchless portions of the project.