Building a Secant Pile Ring Wall for the I-75 Repair Shaft

We recently completed another repair shaft like we did to rescue Bertha in Seattle. The I-75 Modernization Project in Michigan required the use of a tunnel boring machine (TBM) known as Eliza. When completed, this new drainage system will replace an obsolete system and aid in the prevention of floods, which has become a major issue in recent years.

Eliza came to a complete halt in Madison Heights during its voyage. The engineering consultant, AECOM, considered various options for resolving the problem, but finally decided that a vertical rescue shaft was the only option to gain safe access to the machine before it could resume its journey.

Due to our extensive experience with difficult drilling conditions, we were contracted to construct a large diameter secant wall ring made up of 56 secant piles to about 150 feet in depth. To ensure the strict vertical tolerances, we employed temporary steel casings during drilling and surveyed the piles using the SoniCaliper technique.

According to Anthony Bauer, a Malcolm Field Engineer, “A one-of-a-kind project requires a one-of-a-kind crew to construct it.”