Case Studies

Commercial Foundations Case Studies: Helical Pier Installation in Bellevue, WA

Tuesday, June 6th, 2017 by Matthew Cote

Challenge

As soon as Matvey Construction arrived on site, a failing allen block retaining wall was found with no drainage. 4 soil borings were then completed, and large pockets of highly mobile sandy soil were located. After temporarily shoring up of the wall, Matvey completed a geo-tech report and permit design.

Solution

In order to fix this problem, complete soil density testing needed to be done. The client was supplied with a structural repair design permit set. A trench was then built for helical piers. Next, they were installed according to plans with a minimum 12-kip capacity to a minimum depth of 45 feet. Matvey completed 3 load tests of 14-kips. Then, a 250 foot long, 30 inch by 30-inch grade beam was poured in tandem with the new structural slab. After this, movement monitors were installed and a 24-month chart was used to evaluate how well the installation will hold up years down the road.

Two years later, there was zero movement as reported by geo-tech tracking the site. The site is still perfectly level and plumb.

About the author
Mat Cote is a third generation contractor who started Matvey Construction in 1999. He enjoys challenges inherent in designing structural solutions for buildings and homes.

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