Massive Excavation Project Required No Vibrations From Construction

By Jeff Griffin, Senior Editor | January 2013, Vol. 68, No. 1

The system was delivered to the job site in mid-March 2012 and was returned to URTS the third week of April, said Graham.

The only time any maintenance was required was when it was necessary to release hydraulic pressure from the five, 80-ton struts to relocate them during installation of sections of the vault/tank.

I-beams and plates came from United Rentals Trench Safety locations in Denver, Riverside, CA, and Las Vegas, NV. The Mega Brace struts came from the company’s Oklahoma City branch.

Installation of the system was done by Iron Woman personnel. Lone Star Welding, Sedalia, CO, did the certified welding of the I-beam walers. Ludwig Drilling, Inc., Castle Rock, CO, was responsible for the caisson drilling.

URTS’ Graham was on site as installation advisor to confirm that the site specific engineered design by D. H. Charles Engineering was being installed in accordance with the design, and he was on site to be available to contact the engineer as questions or variables arose. The system was inspected daily by an Iron Woman designated “competent person” as required by OSHA.

Graham said the project illustrates the value of renting shielding and shoring for large, unique projects.

“We estimate the cost to purchase the steel beam and plate shoring for this project would have been more than $250,000,” said Graham. “The Mega Brace struts would have cost another $150,000. We were able to provide a rented solution at a savings of more than 85% below the purchase cost.

“If a Mega Brace system had been purchased for this project, six-to-nine months lead time would have been required by the English manufacturer. URTS was able to provide necessary shoring components from inventory with eight truckloads from our Denver facility and another eight truckloads from other locations.”


United Rentals is the largest equipment rental company in the world, with an integrated network of more than 800 rental locations in 48 states and 10 Canadian provinces. More than 10,000 employees serve construction and industrial customers, utilities, municipalities, homeowners and others. The company offers for rent approximately 3,000 classes of equipment with a total original cost of over $7 billion.

In addition to shielding and shoring equipment, United Rentals Trench Safety branches also carry confined space ventilators, air monitor detectors, and other shoring equipment, and offer 24-hour emergency response and professional safety training.

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