The initial shoring of choice used an anchored steel sheet pile wall thru ~30’ soft clay further driven to refusal in sandy glacial tills. The joint venture between SWC and Condon-Johnson & Associates, Inc. created a less costly alternative by forming in-situ Soil-Cement Columns reinforced with HP Piling. The H-Piles allow larger but fewer strand tie-back anchors to be drilled to 120 ft saving on anchor quantities.

This specialized foundation shoring system allows the vertical soldier piles to be driven to bearing at 50 ft depth but leave the Soil-Cement Column at10 ft below grade at 30 ft deep, thus saving on wall area.

If sheet piles were used they would all have to be driven to bearing at 50 ft depth to carry the vertical load.

A Soil-mix-wall is a row of overlapping soil-cement columns creating a continuous thickness of material of the required engineering characteristics.

A rotary drilling machine mechanically drills a constant diameter hole while cement slurry is injected into the drill cuttings at high velocities. The result is a soil-cement column of engineered strength, consistency and dimension.

Scope of Work

Soil-Mix Columns: ~ 500 each x 30” F = 1,200 LFt
Bulk excavation: ~ 200,000 cubic yards
Anchored shotcrete shoring: ~ 25,000 square feet
Ground conditions: Clay overlying hydraulic sands and gravels to boulders