Consultant Engineers.
Geology and Rock Mechanics

CIAC Water Project Segment 2, Phase 1: Rivercrossing


This microtunnel project was part of the Design Build Capital Improvements Program for the City of Tampa. For future city growth, Bradshaw microtunneled a 60" steel casing under the Hillsborough River for a new 36" DIP water main. Two shafts were constructed: a 23' ID launch at Julian B. Lane River Park and a 10' OD receiving shaft at the Straz Performing Arts Center. The water main was installed in the casing and shafts, tested, disinfected and grouted in place. The project challenges included a compressed construction schedule, shafts in close proximity to the river, less than 2 diameters of cover over the tunnel under the river bottom, first time use of soil mixing for the launch shaft, numerous unknown existing utilities, and differing site conditions with more chert encountered than anticipated. The project was completed expeditiously without any accidents or safety violations earning CH2M-Hill's Excellence in Safety (ESP) Award.