New Mississippi River Bridge
The New I-70 Mississippi River Bridge Crossing connecting downtown St. Louis with the Metro East. The four-lane, cable-stayed main span, located south of the McKinley Bridge and about a mile north of the Martin Luther King Bridge underwent various alignments and span configurations during the preliminary and final design phases which began in 2000. When completed in 2014, the new bridge will be one of the largest cable-stayed bridges in the United States.
Services provided by Geotechnology:
- Geotechnical drilling, shallow and deep
- Drilled Shaft Testing
- Geophysical seismic field testing
- Laboratory testing
- Geotechnical engineering
- Environmental assessments
- Subsurface Utility Engineering Quality Levels D, C, B, and A
- Concrete and Steel Quality Control Testing during construction
- Phase I & II Environmental Site Assessments
Highlights/Solutions for The Mississippi River Bridge:
- Drilling experienced unique conditions, not typical with the project area. Cobbles and boulders in igneous and metamorphic origin were encountered immediately above the bedrock. Drilled and driven casing combined with wireline coring techniques were used to penetrate the boulder zone and successfully core over 25 deep structure borings for the Bridge Pylon and approaches.
- The use of the self-propelled barge reduced the actual costs for the floating platform by 65%, allowing the installation of additional deep structures holes without impacting the overall project cost.
- Geotechnology’s ownership of our own drill rigs and equipment allowed over 5,500 linear feet of soil drilling and 950 linear feet of rock coring to be completed in three months, exceeding production expectations.
- Self-propelled jack up barge & trailer-mounted drill rig
- Ground Penetrating Radar (GPR)
- Acoustic Televiewer (ATV) surveys
- Cross Hole Sonic Logging
- EM Radio Detection
- Cone Penetration Testing (CPT) with seismic piezo cone