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The Adele

Washington, DC

DESCRIPTION

The redevelopment project involved construction of a new 8-story, mixed-use project located only three blocks north of the White House. The original structure was razed except for the lowest two floors of the exterior façade. The limited 5,025 square foot site was bordered immediately by property lines on three sides and the original façade on the fourth side.

CHALLENGE

Soil conditions at the site consisted of up to 8.5 feet of mixed fill including sand, silt, gravel, clay, and debris including glass, brick, and concrete fragments. The fill was underlain by terrace deposits ranging from loose to medium dense sand with varying amounts of fines (SP, SM, SC) and firm to stiff lean to fat clay (CL, CH) to depths up to 35 feet. In limited areas, a thin organic silt layer was encountered within the terrace deposit layers. Loose to very dense residual silty sand and silt was encountered to depths of 35 to 40 feet followed by weathered rock. Groundwater was encountered below 30 feet. The main challenge consisted of installing a cost-effective, low vibration deep foundation on an extremely tight urban site.

SOLUTION

The geotechnical engineer considered numerous deep foundation options including caissons extending to bedrock, augercast piles and Ductile Iron Piles. Ductile Iron Piles were selected because of the ability to work on the congested site, modular and self-contained nature of the operation and low vibration levels to allow work immediately adjacent to the property lines.

Ductile Iron Piles were designed for a working capacity of 40 tons (compression). The DIP design consisted of Series 118/7.5 piles (118 mm diameter with 7.5 mm wall thickness) to develop working capacities of 40 tons by driving through the terrace and residual deposits to terminate by achieving set on weathered rock. In a number of locations, the piles were required to support 40-ton compression loads as well as 5-ton tension loads. A modified installation approach using a Series 118/7.5 pile with an oversized 220 mm conical grouting shoe was used to create a friction bond by continuously pumping grout during installation. The piles were still driven to terminate by achieving set on rock but resisted the tensile loads with a center bar inserted into the center of the friction pile.

A compression load test was performed at the site. Deflection of the compression pile was less than ¼-inch at the 80 kip design load. Following pre-production testing, a total of 145 piles were installed to terminate the rock at depths on the order of 25 to 30 feet below the working grade.

 

Owner

Red Multifamily Development - Washington, DC

General Contractor

Ellisdale Construction - Washington, DC

Architect

Nelson Architects, PC - Washington, DC

Structural Engineer

Ehlert Bryan - McLean, VA

Civil Engineer

Vika Capitol - Washington, DC

Geotechnical Engineer

Schnabel Engineering - Washington, DC

Product

Ductile Iron Pipe Piles (DIP’s)

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