DeWitt’s Patented Driven Grout Pile
The Driven Grout Pile was conceived to provide an economical pile capable of supporting loads in excess of 100 tons. In most situations it will provide a cost saving pile in lieu of the normal precast-prestressed concrete pile, H-pile, pipe pile, or augercast pile.
Unique Driven Grout Pile Process
View our Driven Grout brochure to learn more. (PDF, 630KB)
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A Driven Grout Pile is driven using a mandrel that is placed in a “boot”. The mandrel is then charged with fluid grout. At this point the driving commences. The grout escapes under pressure from the tip serving to maintain the diameter of the shaft and provide lubrication to facilitate extraction of the mandrel. Once bearing is met (terminal driving criteria), the grout is injected under pressure as the mandrel is extracted. The design of the mandrel keeps soil from entering the grout column. The pile is completed by installing a rebar cage and a top sleeve. Since there are no spoils that accumulate, this sleeve forms the top of the piling.
Hammer Energy Goes Directly to the Tip of the Pile
Since the mandrel is continuously being driven through an annular column of fluid grout, the only resistance encountered during driving is that which is localized at the tip of the pile. All hammer energy therefore goes directly to the tip of the pile, conforming neatly to the wave equation. It is after the grout column gains strength that the skin friction develops. This phenomenon imparts an inherent conservatism to the ultimate capacity of the piling.
Densification Increase Load Carrying Capacity
Driving these piles with conventional equipment results in a large load carrying capacity due to the densification of the soil at the tip, also increasing the friction factor around the perimeter of the pile.
No Spoils, and Little Material Waste During Installation
The process produces virtually no spoils, which is very significant in contaminated construction sites. It is a concrete pile, and therefore is resistant to most all corrosive conditions which otherwise may attack steel piles. Since the piling is cast in place, there is no cutoff, and little waste of material during installation.
The graphs below provide additional load test and boring information. Click the graphs to view a larger image. (Use your browser's Back button to return to this page.)
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To learn more about DeWitt's Driven Grout Pile process or to contact DeWitt about handling your project, please call toll free, 1-800-952-8808, or view our contact information. And, you can view a list of our Driven Grout pile projects.
