Project:
Sector – Pharmaceutical Manufacturing Plant
Location – Ohio
Application(s) – Deep Foundations, Vibratory Stone Columns (VSCs), Aggregate Piers

Project Description:
A chemical plant was adding a new manufacturing facility. The sub-surface conditions generally consisted of a sand/gravel material to a depth of approximately 10 feet. The material below the fill consisted of stiff gray clay approximately 9 to 18 feet thick.

Project Requirements & Challenges:
The design requirements for this new facility included columns and continuous footings with a bearing pressure of 1300 psf and the floor slab was 230 psf. The maximum long-term settlement was less than 1 inch and the maximum differential settlement was less than a half an inch.

Solution:
Based on the sub-surface conditions and the design requirements, Helitech chose Vibratory Stone Columns (VSCs or Geopiers) as the ground improvement method. Helitech installed 24 inch diameter vibratory stone columns to a depth of 25 feet below the column and continuous footings.

In the floor slab area, Helitech installed 24 inch diameter vibratory stone columns to a depth of 10 to 19 feet.

Overall, Helitech installed 1,578 Vibratory Stone Columns to support the new foundation and floor slab.

Results:
Helitech performed one (1) full scale modulus test and two (2) plate load tests to validate the design and installation of the VSC’s. The full scale load test had a quarter of an inch deflection at 1.5DL (17.55 kips). The two plate load tests had less than 0.14″ deflection at 1.0DL.

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