LAKE MEAD INTAKE NO. 3 TUNNEL INTAKE STRUCTURE AND TREMIE CONCRETE PLACEMENT

摘要

The Lake Mead Intake No. 3 Tunnel and Shafts Project includes construction of a 183 m deep vertical access shaft, an approximately 4,8 km long, TBM-mined, 6.1 m inside diameter segmentally lined tunnel, and a composite concrete and stainless steel intake structure that is placed in 100 m depth of water at the bottom of Lake Mead. This paper discusses the operations related to the setting of the intake structure into the excavated shaft located in the bottom of the lake. The work consisted of placing a guiding frame into the excavated hole to seat the intake structure in the proper position, surveying of the intake location, and placement of tremie concrete around the submerged intake structure.