The $850 million Governor Harry W. Nice Memorial Bridge Replacement Project will involve the construction of a 1.7 mile four lane bridge over the Potomac in a location just north of the existing two lane span. During the design phase, Froehling & Robertson, Inc. provided subsurface exploration and laboratory testing services for one of the largest highway infrastructure projects undertaken in the Mid-Atlantic. In doing so, we successfully completed the single largest contract award in our 135 year history under an extremely tight schedule which included performing most of our services during inhospitable winter weather months.
In order for the project design team to devise foundation elements and retaining wall structures and monitor predicted subsurface responses to the construction, F&R’s drilling division provided an extensive subsurface land and sea exploration. F&R was able to successfully overcome the difficult subsurface drilling conditions and location access and equipment coordination issues, including drilling on barges in the navigable waterways of the Potomac River. Our laboratory program consisted of a suite of more than 2,300 individual tests.
F&R’s certified drillers provided extensive field testing during land exploration including SPT borings in excess of 215 feet, CPT soundings to depths of 150 feet, and DMT soundings to depths of 125 feet.
Our drilling professionals provided the same quality services on the water and advanced numerous underwater borings and field testing via barge including SPT borings in excess of 250 feet, CPT soundings to depths of 190 feet, DMT soundings to depths of 160 feet, as well as vane shear, pressuremeter, and seismic testing.