Eighteen shafts will be utilized for microtunneling installations, six for launches, and 11 for equipment retrieval. The shafts vary from 18 feet to 30 feet and have an average depth of 30 feet. Twenty shafts will be used for EPB installations, 11 for launches, and nine to accept the emerged equipment. Those shafts are 28 feet to 32 feet deep.
In March 2015, Frontier-Kemper Constructors used an Akkerman SL60 microtunnel boring machine (MTBM) for the first time to install 750 feet of Thompson Pipe Group fiberglass reinforced Flowtite pipe.
Typical microtunneling machine, aboveground control container, remote hydraulic power pack, keyhole jacking frame, pumps, laser, water cooling tank, slurry trunk and lines, and slurry separation plant. Launch shaft’s pit seal prevents flooding; thrust block distributes jacking force. Machine’s laser guidance system reports alignment statistics to operator in control container alongside shaft.
The Clark County Water Reclamation District’s new 13-mile interceptor is being installed in three segments, each awarded to a different design and construction team. From right to left, Eastern segment design: Carollo Engineers Inc. with Denver-based Brierley Associates as sub-consultant; prime contractor: Las Vegas Paving. Central segment design: Black and Veatch Corp.; prime contractor: Contri Construction of Las Vegas. Western segment design: MWH; prime contractor: Southland Contracting of Roanoke, Texas. The prime contractors are responsible for all cut and cover installations, shafts for tunneling operations, and general construction.