All posts by Jeffrey W. Coonse, PE

Duke University Bed Tower Secant Wall

Secant Pile Wall

Subsurface completed a permanent secant pile wall at the VA War Memorial.  The wall serves as a permanent basement wall and supports vertical load from the structure.

Freddie Mac Ground Shoring FM6

First driven soil nail wall is allowed in Fairfax County, VA

For the Freddie Mac Expansion project in McLean, VA, L.F. Jennings (G.C.) selected Subsurface Construction to design and install the ground shoring system around the perimeter of the site. Fairfax County has a shoring geotechnical review board with strict guidelines for allowable soil properties used in shoring design.  We were informed by the project geotechnical engineer that the review board never allows soil properties other than those stipulated by the board.

Always looking to innovate, T.J. Ju, P.E., Chief Design Engineer at Subsurface, made a compelling argument by presenting verifiable historical data and research results to the review board and convinced them to allow alternative soil properties that more closely matched the existing subgrade conditions found on site.  In conjunction with this data, Subsurface developed a program to verify the assumed properties by testing the soil at every lift and sending data to the client.  As a result, we were able to utilize our Driven Soil Nail System, developed by our company, which saved the owner time and money.

By working in close conjunction with the grading contractor, we were able to install as much as 1,300 sq. ft. of shoring in a single day, and completed the shoring installation 2 weeks ahead of schedule.  Innovation is a hallmark of our company and we are pleased to be a part of this progression for soil nail wall design in the Fairfax County region of Virginia.

Subsurface South Carolina Construction News

Subsurface is featured in SC Construction News

Engineers build successful Carolinas shoring construction business with participation of employee owners

South Carolina Construction News special feature

Formed in 1995 by three engineers, two structural and one geotechnical, Subsurface Construction Company LLC has grown over time to two regional offices, a staff of 35 and the capability of handling multiple, complex shoring and deep foundation projects at once.

The three founders started in the business as consulting engineers in Raleigh, NC, designing shoring systems for installation by contractors. Greg Sullivan, P.E., Subsurface’s managing member, says the group recognized that there were very few shoring contractors in the area, saw the market need, and launched Subsurface.

“We began in the shoring construction business by installing our driven soil nail walls, a unique shoring system that was developed by our company,” he said.

Read the full article >

Subsurface Construction Company Develops Senior Community Site

Subsurface Helps Develop Senior Community Site

Developer taps into demand created by Triangle’s growing senior population

Drilling Safety – Always Critical

I am sharing an email from one of our industry safety leaders:

All,

This is yet another unfortunate reminder of how dangerous / deadly our work can be.  While the exact details are not known as yet, it is thought that some type of entanglement incident occurred between an employee and the rotating drill string (in this case the cfa) you see in the photos.

It is a reminder of just how close employees  get to “the work” during a tieback installation.  It is possible that the communication between the drill rig operator and the helper were poor, the employee was wearing loose fitting clothing (i.e. a safety vest), he was cleaning the auger flights with a 2×4 or some other object, the emergency shut off switch was not functional, or some other probable cause, leading up to the loss of this young man’s life.

Please try to use this article a learning tool.  Resist the temptation to look up the affected contractor and better spend your time looking at your own operations.  What can we do as individuals or as an association to help prevent a tragic accident such as this from occurring once again? Observe how you install a tieback or micropile.  How close do your employees get to the rotating drill steel?  How good are the communications between the operator and helper?  Does the emergency shut off switch actually work?  Do you inspect / check it every shift?   Remember too, this type of incident could take place on a drilled shaft project, any CFA type project, soil mixing or slurry wall project or any other environment where we have to work in close proximity to a rotating object.

Use this unfortunate accident to serve as a deadly reminder of just how dangerous our work is.

http://fox6now.com/2015/02/28/developing-construction-worker-killed-on-zoo-interchange-site/

 

Richard Marshall CHST | Safety Director

Richard Goettle, Inc.

12071 Hamilton Ave., Cincinnati, OH 45231

Phone: (513) 825-8100 | Fax: (513) 825-8107

Mobile: (513) 604-3009 | rmarshall@goettle.com

www.goettle.com