PROJECT DESCRIPTION
HOME DEPOT
RENTON, WA
MORRIS-SHEA PROJECT COMPONENTS
RESTRICTED ACCESS INSTALLATION
225 DEWAAL SCREW PILES: up to 55’
DEWAAL SCREW PILES:
– Value engineered alternate
– No spoils
– Accommodates height restriction
– Economical temporary casings
PROJECT OVERVIEW
Morris-Shea, a leading deep foundation contractor, completed installation of DeWaal Screw Piles at a vacant Renton, Washington Sam’s Club that is being repurposed as a Home Depot. New foundation piles were required to support higher floor loads resulting from Home Depot’s heavy inventory materials and forklift equipment. DeWaal Screw Piles were recommended by Morris-Shea as a Value Engineered
Alternative to the base bid micropiles. DeWaal SPs were able to accommodate the project’s interior
height restrictions.
RESTRICTED ACCESS INSTALLATION
Two remote controlled Fundex CD20 drill rigs with 20 ton-meters of torque and 15 tons of crowd force were used to install the DeWaal Screw Piles. The rigs have sectional leaders, which can be adjusted from
13 to 60-feet in length to accommodate various height restrictions. The 20-foot access restriction from the roof trusses to the floor slab and pile lengths up to 55-feet, required that sections of temporary casings with quick disconnect couplers be added during drilling to achieve the required depth. A sacrificial bit was attached to the bottom of the DeWaal SP tool.
ON SITE GROUT MIXING
Morris-Shea manufactured high strength sand-cement grout on site with a voumetric mixer to ensure that the grout was fresh and piles were poured without delay. Grout was transported to the pile locations using telescopic reachfork loaders and discharged directly into the casings as they were extracted by CD20 drill rigs.
PILE LOAD TESTING
Pile load testing was performed in two locations to assure the VE concept achieved project specifications. A few piles were also excavated down several feet and wer shown to be well-formed with consistent pile body diameters and concrete flight diameters and pitch.
