HomeMy WebLinkAboutHart Residence_Engr Report_1-19-2022FDN Engineering, LLC
Date:
Project:
Address:
Push Pier Foundation Support System Analysis
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
To the best of my professional knowledge, belief, and opinion, the design of the push pier support system
meets the structural requirements of the 2020 Florida Building Code, Seventh Edition to the extent that it
applies to our scope of work. The push pier foundation support system is not intended to be the primary
support system for the structure, rather a supplemental stabilization system.
Upon completion of foundation support system, the contractor shall supply engineer a log of the installed
locations, depth, and final drive & lift pressure of the push piers. Engineer will evaluate the log and prepare a
completion report.
January 19, 2022
Hart Residence
344 Palms Ave.
Fort Pierce, FL 34982
This report is prepared for Alpha Foundation Specialists (contractor) by FDN Engineering (engineer). Push
piers are specified for installation at the above referenced project. The foundation support system is
intended to stabilize and potentially lift the existing foundation structure – reducing pressure on existing
soils. Load requirements for the push piers were calculated at areas identified by the contractor. See page 2
for engineering analysis assumptions and results. See page 3 for design information and details for the push
pier foundation supports. See page 4 for a layout of the supports proposed by contractor on a footprint of
the structure.
Page 1 of 4
FDN Engineering, LLC
Project Assumptions (contractor to confirm assumptions):
1.
2.
3.
4.
5.
6.
Analysis Notes and Results:
7.
8.
9.(allowable stress combinations).
10.
11.
12.
13.
14.
15.
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
This item has been digitally signed and sealed by
January 19, 2022
Printed copies of this document are not
considered signed and sealed and the signature
must be verified on any electronic copies.
achieve the desired ultimate load or lift the structure. The capacity of a pier in compression is
based on the interaction of the brackets, shafts, and soils.
A factor of safety of 2.0 is conservatively used for push pier systems since the drive and lock-off
loads are easily measured. Geotechnical testing information was not provided for this design.
Push pier spacing along the foundation shall not exceed 6'-0" O.C. and 2-ft from a corner.
An install hydraulic drive pressure of
Chad A. Keller, P.E. on the date adjacent to the seal.
We recommend installing push piers with a 2-7/8” dia. shaft (PP288) and a 48" external sleeve.
Roof and floor dead/live loads are based on guidance from the Florida Building Code.
Push piers are designed to support axial compression load only.
Add/drive pier sections until a suitable load bearing stratum is encountered. The structure will lift or
target pressure is achieved.
1,600 psi using drive cylinder FS35DC (288 - Red) should
After all piers are driven, reload using lift cylinder to 800 psi to stabilize the structure or until desired
lift is achieved.
The systems should be used on structures that are fixed from translation or braced to prevent
translation of the foundation. The surrounding soils must provide continuous lateral support.
When the product is installed in a soil where the conditions are considered corrosive to steel,
adequate protection to the exposed steel must be provided.
The product is installed in undisturbed or uniformly placed and well-engineered fill soils. Pier is not
installed in recently backfilled sites, in bedrock soils, or where there is possible sinkhole activity.
Structure is one-story, single family residential with 4 in slab on grade floor & wood-framed walls.
Contractor will install push piers, brackets, and all related components per the support
manufacturer’s current installation instructions and technical manual & UES Evaluation Report 289.
The capacity of the existing foundation and supported structure has not been checked and is
assumed to be adequate to transfer the design loads to the push pier support system.
Maximum, worst-case, total load on a push pier is 7,300 lbs
Page 2 of 4
FDN Engineering, LLC
The above information is taken from Supportworks Technical Manual.
FDN Engineering, LLC
2412 N 179th St.
Omaha, NE 68116
(402) 739-9642
Printed copies of this document are not
considered signed and sealed and the signature
must be verified on any electronic copies.
January 19, 2022
Chad A. Keller, P.E. on the date adjacent to the seal.
This item has been digitally signed and sealed by
Page 3 of 4
Notes:
1.
2.
3.Hydraulic drive pressure = 1,600 psi
4.Calculated ultimate load =14,600 lbs
5.
6.
DRAWING NOT TO SCALE
This item has been digitally signed and
Fort Pierce, FL 34982
Hart Residence
Project:FDN Engineering, LLC
2412 N 179th St.
(402) 739-9642
Omaha, NE 68116344 Palms Ave.Printed copies of this document are not
considered signed and sealed and the
signature must be verified on any electronic
copies.January 19, 2022
Install per push pier manufacturer’s
instructions and technical specs.
Residential construction, one-story.
sealed by Chad A. Keller, P.E. on the date
adjacent to the seal.
A reload lift pressure is estimated at 800
psi to stabilize or until lift gained.
Layout of (12) push piers, Model PP288.
Page 4 of 4
FOOTPRINT OF
RESIDENCE
1
2
3 4 5 6 7 8 9
10
11
12
GARAGE
LEGEND:
Indicates Push Pier
and Mark Number0