Typical Row House Pile Alignment

Test Pits Outside of Building

Test Pits Inside of Building

Underpinning: Cut and Cap

Sound Part of Pile

Steel Lally Column and Rebar. Will be encased in Concrete up to bottom of Granite.

Granite Pile Cap

Steel Lally Columns Will be encased in Concrete up to bottom Foundation.

Possible Alternatives to Cut and Cap: Bracket Piles

Bracket Piles Brackets

Possible Alternatives to Cut and Cap: Soil Stabilization Techniques

Uretek Resin Jet Grouting

Why Cut and Cap may still be the best option

• Ability to get at piles and inspect them

Look at pile, soil, and groundwater level

• Reliable permanent solution

Engineering assessment and design

Piles cut based on the lowest expected future GW levels

Steel Lally column encased in Concrete to maintain the “load path”, provide bracing, and prevent corrosion

Alternatives may or may not work we know (when properly engineered) cut and cap does work

QUESTIONS?

Sound Piles

Granite Pile Cap

Granite Pile Cap

Sound Pile

Sound Pile

Sound Piles

Rotted Piles Granite Pile Cap

Rotted Pile

Dry but Sound

Pile

Granite Pile Cap

Rotted Pile

© James Lambrechts, 1991