Secant / Tangent Wall

Oakland Macomb Interceptor Drain

36 Tangent Piles Installed

37' diameter shaft constructed for acces to a 12'9" damaged sewer tunnel approximately 120' below grade. 

36" Diameter Shafts

120 ft. Drill Depth

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

120 ft. Drill Depth

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