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ATLAS RESISTANCE PIERSCASE STUDY 985-2
Atlas Eccentric Resistance Piers Keep Sales UP
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 This is a view of the job site where workers are installing supplemental support. ATLAS RESISTANCE PIERS provided support to the existing structure during excavation. |
Description of Project: The existing structure houses a large retail department store. Due to growth in the area, a multi-screen cinema was planned to be constructed adjacent to the store. The finished floor elevation of the new building was approximately ten feet below the footing of the existing structure. The designer had to address the problem of supporting the existing structure while the soil was excavated adjacent to the footing of the retail store. Also, the store in the existing structure needed to maintain operations without disruption from movements or vibrations during construction of the cinema.
Soils Description: The retail department store was constructed upon approximately three feet of clayey sand fill. Below this fill material was ten feet of clay and clayey shale. The Standard Penetration Blow Counts for the clay and clayey shale was from 23 to over 50. The dense soils and rock made conventional underpinning impossible.
Description of Design: The engineers recommended supplemental support for the existing structure using ATLAS ECCENTRICALLY LOADED RESISTANCE PIERS. Suitable bearing for the Piers was recommended to be approximately 14 feet below the existing footing. The concern was being able to support the existing structure off of a layer of shale approximately 4 feet below the bottom of the proposed excavation. Given the high Standard Penetration Blow Counts found on the site, the engineers recommended that an access hole be bored through the clayey shale and shale at the higher elevations so that the ATLAS RESISTANCE PIERS can be bearing on the selected stratum at the desired elevation below the new construction.
ATLAS RESISTANCE PIER SUMMARY Design Engineer: L. A. Fuess Partners , Dallas, TexasInstalled By: Atlas Foundation Systems - OKC, Oklahoma City, OK Atlas Resistance Pier Product: AP-ELPP-4000M -- ATLAS ECCENTRICALLY Number of Resistance Piers: 6 Design Load: 30,000 pounds Average Working Load: 8,000 to 15,000 pounds Factor of Safety:
2 : 1 [100% above Design Load] Average Depth: 14 feet through clayey shale and shale |
RAPID INSTALLATION!
The photograph below left shows the rock drill boring a hole through the dense soil and shale to the target depth for the end bearing ATLAS ECCENTRICALLY LOADED RESISTANCE PIER PIPE. Before the boring machine was positioned, and carefully aligned to produce a vertical hole, an excavation was dug to permit later mounting and driving of the ATLAS ECCENTRICALLY LOADED RESISTANCE PIER SYSTEM. Notice in the photo below right how the footing is smoothed perpendicular to the load bearing exterior wall of the existing structure prior to drilling. Not only is the vertical face of the footing prepared, the bottom of the footing is also cut perpendicular to the vertical face and smoothed to provide a bearing surface for the Pier Bracket. This insures proper uniform load transfer from the Pier to the Footing.
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ECONOMICAL ON-TIME COMPLETION! The sketch left shows the Pier Location Plan on the existing foundation, and the proximity of the excavation. Below is a cross-sectional detail of the design. Notice the challenge given to the designers in penetrating the stiff soils to achieve supplemental support at the target depth. ATLAS ECCENTRICALLY LOADED PIERS were the logical choice. The pier combines the strength, reliability and rapid installation of standard ATLAS RESISTANCE PIERS, but is designed with an off-set to permit installation in a bored hole. |
This sketch shows a cross sectional view of the Atlas Eccentric Pier Installation.
 After the installation hole was bored, the ATLAS RESISTANCE PIER was installed to the target bearing stratum approximately four feet below the limit of the proposed excavation. The perforated Pier Pipe was filled with grout under pressure to fill the voids, then each Pier was loaded to the design force specified by the engineer. The photograph above shows a technician using quiet, vibration free hydraulic equipment to install an ATLAS RESISTANCE PIER. |
SUCCESS! The selection of the ATLAS ECCENTRICALLY LOADED RESISTANCE PIER SYSTEM allowed the project to continued without delay. The Piers provided the design support, and there was no damage to the existing structure during construction of the multi-screen cinema. The photograph right gives a close view of the installed Pier. The ATLAS ECCENTRICALLY LOADED RESISTANCE PIER SYSTEM is constructed of 1/2" and 3/4" steel for heavy duty applications. The assembly weighs nearly 300 pounds and has an ultimate capacity of 60,000 pounds! |
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Atlas Piers … THE SOLUTION!
1026-B South Powell Road
Independence, MO 64056
Office: (816) 796-6800
Fax: (816) 796-0919
Toll Free: (877) 285-2739
Email: info@atlassys.com