Drilled Shafts · Somerville
Rock-Socketed Drilled Shafts, Somerville
Heavy column loads required a high-capacity foundation reaching bedrock, with low vibration near adjacent structures.
The problem
Heavy column loads required a high-capacity foundation reaching bedrock, with low vibration near adjacent structures.
The engineered approach
Cased drilled shafts were advanced through fill and clay and socketed into bedrock, then reinforced and concreted to develop high capacity.
Outcomes for the GC
- High-capacity foundation to bedrock
- Low-vibration installation near neighbors
- Zero recordable safety incidents
How we built it
A schematic section of the drilled shafts system for this Somerville job. Scroll to build it in construction order, or select a callout to read the detail.
Callouts
Select a numbered part below to read what it is and what it does.
- Steel casing holds the bore open through caving fill and soft Boston blue clay, then is withdrawn or left in place as concrete is placed.
- The cased shaft is augered down roughly eighty feet through fill, clay, and dense glacial till, producing low vibration that protects adjacent structures.
- A full-length cage of longitudinal bars and spiral ties is lowered into the bore before concreting to carry bending, tension, and uplift.
- A reduced-diameter socket is drilled into argillite bedrock so the shaft develops very high side resistance and end bearing for heavy column loads.
- The tremie-concreted toe bears directly on competent bedrock, giving the deepest, highest-capacity support on the site at about eighty feet.
Ready to scope your foundation?
Tell us about the project and we'll put together a detailed quote within 3 days. We generally work with general contractors.