To maintain schedule in the face of local downtown construction work ordinances, Keller installed the drilled shafts using 3 drills and 2 cranes.

One St. Petersburg

The project

One St. Petersburg, a 41-story residential tower and 13-story hotel separated by an 8-story parking garage was to be built in downtown St. Petersburg. Upon completion, it will be the tallest building in St. Petersburg.

The challenge

A very fast production schedule required up to 3 drills and 2 cranes to complete the work, causing a tight and congested site. Seven shaft diameters were designed for this project (24 in. to 66 in.). Much of the site was taken over by tooling, casing and shaft reinforcing cages reducing the working area significantly.

The solution

We installed 178 drilled shafts with depths reaching over 148 ft deep using temporary casing and natural slurry. We also performed 2 load tests with thermal integrity profiling. Constant planning and re-planning along with working 7am to 9pm shifts each day allowed us to battle through and complete the project and make a good client out of Kast, the general contractor.

Project facts


The Kolter Group, LLC

Keller business unit(s)


Main contractor(s)

KAST Construction


Driggers Engineering Service Inc.