This challenging project required large diameter drilled shafts to be installed at all four corners of the very busy intersection at NW25th St and SR-826 in Miami, FL. The foundations support a fly-over to span SR-826. At each corner, a 96” Drilled Shaft was installed on the ramps to the overhead highway, working around the clock through the weekends. The total project had 5 production drilled shafts – four 96” in diameter with depths from 75 feet to 85 feet, and one 96” x 116 foot test shaft. Each shaft has permanent steel surface casing, and was installed using mineral slurry due to the highly variable sands and limestone elevations. Each shaft was inspected using the Mini-SID (Shaft Inspection Device) and CSL tests to verify shaft integrity. A.H. Beck Foundation drilled the shafts using a Bauer B-36 (367-kNm torque) Rotary Drill custom fitted by A.H. Beck Foundation to a Liebherr 883 crane.
OWNER: Florida Dept. of Transportation
GENERAL CONTRACTOR: Astaldi Construction
The Interstate 10/US 59 interchange near downtown Houston is touted as one of the busiest highway intersections in the state. Widening US 59 at this intersection was no easy task for TxDOT — due to the cities’ growth surrounding the interchange. The design called for large diameter deep foundations (to support single columns) in very tight locations. A. H. Beck was the successful bidder due to their experience and highly productive equipment for installing large diameter shafts with the high water table and soft coastal soils found at the site.
A. H. Beck Foundation Company installed drilled shafts to support the many bridges of the Interstate 4/Crosstown Expressway Connector (a limited-access, elevated toll road connecting the Lee Roy Selmon Crosstown Expressway to Interstate 4 in Tampa, Florida). Construction of the drilled shafts required 5 drill rigs working around the clock to install 1,200 shafts with diameters ranging from 36 inches to 90 inches in diameter. With highly variable subsurface soils (predominantly sands and clays overlying a Karst Limestone formation), the foundation depths ranged from 40 to 150 feet. This unpredictable subsurface created construction challenges. A. H. Beck used a method of sectional, temporary steel casings to stabilize the overburdened soils. This process allows additional temporary casings to be added, thus ensuring a stabile shaft.
General Contractor: PCL / Archer-Western Joint Venture
Owner: Florida Department of Transportation
This was a multi-phased project to allow this heavily traveled roadway to continue in service throughout the reconstruction. A. H. Beck utilized a combination of hydraulic and friction cranes with capacities ranging from 20 tons to 140 tons. Drill rigs included crane attachments, European style IMT rigs, and track mounted rigs manufactured by A. H. Beck. Temporary casing was installed and extracted with a vibratory hammer in the top portion of the slurry displaced shafts which were exposed to install the precast retaining wall panels.
The purpose of this project was to construct new paving and a series of bridge structures to straighten the “S” curve on IH59 through Laurel, MS. There were 166 drilled shafts, ranging in diameter from 36” to 72” and depths from 50’ to 93’, which included 5 Osterberg cell test shafts. A. H. Beck used temporary casings and permanent casings and the slurry displaced method to complete this project in 8 months. A lightweight hydraulic drill unit fabricated by A. H. Beck was used. It runs off the hydraulic motors of a 140 ton new generation crawler crane, which provides reaches previously only achieved by cranes with 200 ton capacities or greater.
This project consisted of a total of 24 drilled shafts foundations, 96 inches in diameter with depths up to 100 feet. Rock sockets of 5 feet into basalt with hardness over 8,000 psi.
• $43 million contract to remove and replace an existing UPRR bridge and widen IH-10
• 198 drilled shafts ranging in diameter from 24” to 84” and depth from 35’ to 105’
• 17,000 CY concrete in 8 months
• Shafts created the structural support for two sets of retaining walls and the new bridge abutment
Project consisted of two 12 foot diameter drilled shafts 130 feet deep. While the majority of the structures were constructed with a pile cluster/footing foundation, two piers required single large diameter drilled shafts due to the limited width of the construction zone and to eliminate the differential settlement of the embankment. A. H. Beck worked with Dorsett Brothers Concrete Supply, Doran Steel, TNT Crane & Rigging, and PumpCo to manufacture a 12’ diameter auger, mix 3000 Bbl of bentonite mineral slurry, set 12’ diameter x 20’ long permanent casing and excavate the 12’ diameter x 130’ deep slurry displaced drilled shaft.
A. H. Beck installed 60,000+ cubic yards of drilled shaft concrete in shafts from 18” to 144“ in diameter for the Dallas Area Rapid Transit CMG3 Light Rail Extension project. The tight right-of-way and restricted working areas required single column/single shaft foundation design for much of the elevated project bridges. Live adjacent railroad lines ran the length of the project right-of-way, which presented challenges in placing large volumes of drilled shaft concrete in an uninterrupted fashion.