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St. Louis, MO


SAK was subcontracted by Bates Utility Company to construct this project which was part of a larger project designed to alleviate basement backups and flooding due to overcharged combined sewers.
A Lovet tunnel boring machine (TBM) was used to excavate a 10’ diameter tunnel through a mixed face subsurface profile consisting of clayed and weathered limestone. Temporary tunnel support consisted of steel ribs and wood lagging installed directly behind the TBM. The TBM terminated into a sloping face of a stormwater canal and required specialized equipment in order to safely and effectively remove the TBM components from the canal. Once completed, 84 inch diameter RCP was installed within the tunnel utilizing pipe jacking methods. The pipe was then back filled with a low density cellular grout that was batched on site.
This project required extensive coordination with local regulatory agencies and businesses, as well as multiple subcontractors and suppliers in order to complete the project on time. A comprehensive disadvantaged business enterprise program was also implemented on this project which required the use of specific percentages of minority and women owned businesses.

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