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Secant / Tangent Wall

Oakland Macomb Interceptor Drain

36 Tangent Piles Installed
37' diameter shaft constructed for access to a 12'9" damaged sewer tunnel approximately 120' below grade. 

36" Diameter Shafts

Drill depth of 120 feet

Vibrated 80 to 110 feet long temporary casing through soft, squeezing clay soils.

Maintaining the tolerances of each pile was critical due to the full length wide flange beam that was installed into each pile.

36 Backup Piles Installed

18" Diameter Shafts

Drill depth of 120 feet 

Piles installed between the 36" diameter piles to insure a complete seal. 

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