Challenge

Built in 1961 the Westminster Bradenton Manor’s South Elevation was slatted for renovation. It was decided to bring the building up to code by removing the entire facade. Hurricane resistant windows, new stucco with Mediterranean detailing and a new mansard roof were planned. Due to the renovation generating additional loading to the existing wall footing. It was determined that there would be differential settlement between the new footer and existing. A deep foundation was recommended to transfer the load from the new footer to the limestone below. To minimize vibration and possible damage to the existing structure, Helical Piers where chosen as the deep foundation to support for the new footer.

Solution

Helical Piers were chosen as the ideal deep foundation system because they can be installed with smaller equipment, with less vibration and disturbance to the existing structure. LRE Foundation Repair was chosen to install the Helical Pier system for this project. Utilizing fifty four FSI 287 helical piers, with 8”- 10” lead sections, installed to 14 foot average depths. The helical piers where installed on 4.5 centers to achieve a design working load of 20 kips per pier. Utilizing a FSI retrofit bracket at each location and hydraulic cylinders, LRE uniformly loaded each bracket. Upon completion, the retrofit brackets and tops of the helical piers were encapsulated into the new footer and foundation. The detail of the footer also consisted of doweling into the existing footer and floor slab.

Project Summary

Architect: James E. Toth Architecture

Structural Engineer: MceIroy Engineering

Geotechnical Engineer: Nodarse & Associates

Construction Manager: Hennessey Construction

Certified Installer: LRE Foundation Repair Inc.

Products Installed: Fifty Four FSI 287- 8" - 10" Helicals to an average dpeth of 14 feet 4.5 feet on center

Building before renovation

Building before renovation

Helical Pier being hydraulically advanced

Helical Pier being hydraulically advanced

Hydraulic cylinder connected to bracket

Hydraulic cylinder connected to bracket

Uniform load applied to each pier

Uniform load applied to each pier

Building after renovation

Building after renovation