BY Steve Barnhardt

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Slide Rail System with Tie Back Provides Necessary Soil Support for Large Precast Tank Installation

A Southwest contractor was tasked with an underground installation project of a concrete cooling tank as part of a manufacturing company’s ongoing expansion efforts. The precast concrete cooling tank needed to be installed in three sections, with each section weighing about 90,000 pounds. The components required an excavation of approximately 40-ft in length, 16-ft in width, and 20-ft in depth. The contractor’s Competent Person classified the soil as Type C-60 soil. The tank’s precast sections’ size and weight presented the initial constraints that each successive decision needed to be incorporated. The project site presented a few concerns with the proximity of a building located 12-ft from one side of the excavation, which required to be protected during the tank installation. The tank’s precast nature also created a need for the excavation to be free-span to accomplish an easy and efficient installation. The contractor required a shoring system to support the loads from excavation walls and provided enough clearance to lower equipment and materials to the excavation.

The contractor contacted NTS to discuss possible shoring options for the project. After presenting a few systems, the contractor elected to use a site-specific engineered slide rail system with tie backs. The slide rail system was installed progressively to prevent the soil from raveling, which helped offset any potential adverse effects on the existing building. The slide rail system’s tie-back design provided the needed clearance, allowing the contractor to utilize a large crane to place the precast tank components within the excavation. The shoring system provided paramount support throughout the tank installation while addressing the limitations of the job site. The contractor was able to perform all of the necessary work on time and was impressed with the performance of the slide rail system tieback combination.




 

 

 

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