Excavation Shoring
Soil Nail Launcher’s excavation shoring falls into three main categories:
Temporary Shoring: Launched Soil Nails can be used for temporary shoring; the application is ideal for deep cuts on congested sites. This solution uses easily-mobilized equipment and does not require extensive steel fabrication. This approach minimizes start-up time and can be faster and less expensive than traditional drilled soil nails.
Traditional soil nailing includes a long delay for the cement in the drill holes to harden. Launched Soil Nails are effective seconds after installation. The Soil Nail Launcher can work in tandem with the primary excavation, resulting in little or no delay for the shoring activity. Shoring 5,000 square feet per day is routine with Launched Soil Nails. In cuts where groundwater is a concern, perforated steel tubes can be used for the tensile inclusions, providing myriad Launched Horizontal Drains. Dewatering can contribute significantly to the speed and safety of the excavation.
Temporary shoring along I-75 near Knoxville, TN
Permanent Stabilization: With minor changes to their design, Launched Soil Nails or SuperNails® also can be used for permanent stabilization. Hollow, galvanized, perforated Launched Soil Nails can be pressure grouted, with an epoxy-coated inner bar installed to increase service life and corrosion protection. Soil Nail Launcher, Inc. has designed and installed hundreds of thousands of square feet of permanent and temporary shoring.
Zero Lot-Line Shoring: Any soil nail shoring scheme requires some room; the nails must embed themselves past the cut face to an appropriate depth. Often that requires easements and permissions from adjoining landowners, which can be time consuming and difficult to obtain. Vertical shoring, such as driven piling, can be expensive and run afoul of local noise ordinances. The solution is shoring using arrays of reticulated micropiles, which can provide an excellent economic shoring system without any easements or the problems of more conventional methods.
Zero lot-line shoring in Telluride, CO
Tennessee Department of Transportation had a major landslide on I-75 north of Knoxville. TennDOT’s geotechnical group designed a repair, and Harry Moore, TennDOT Region 1 Geotechnical Engineer, and his team led the project. The project included a 100-foot-high excavation on a 1:1 slope to key in a rock buttress. Moore and his team decided that such an excavation should be temporarily shored. Moore estimated that, due to site constraints, shoring the excavation with traditional soil nails would delay the project by a month. Instead, TennDOT elected to use Launched Nails, which in contrast to traditional nails are effective immediately. Soil Nail Launcher, Inc. completed the shoring in four days and within the active excavation. The project contractor reported no delays. Moore estimates the total savings of using Launched Nails to be in the hundreds of thousands of dollars.
Contact:
Bob Barrett, Soil Nail Launcher, Director
bob@soilnaillauncher.com
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Launched Nails for temporary shoring saved Tennessee taxpayers hundreds of thousands of dollars |
Temporary shoring completed in four days and within the active excavation |
Ohio Department of Transportation awarded an embankment slide repair contract to Savage Construction of Wheeling, WV. The repair included excavation of the slide mass and replacement with angular rock. As the excavation neared completion, a tension crack developed in the pavement above the cut. ODOT was maintaining traffic at the top of the excavation and was concerned that the excavation slope would fail before the contractor reached planned depth.
ODOT instructed the contractor to immediately replace some of the excavated material and halt the project. ODOT decided that temporary shoring should be installed to prevent the tension crack from developing into a full-blown slide that would take the road out of service. ODOT estimated that temporary shoring design and construction for this project would cost $200,000 and take six to eight weeks to complete.
ODOT Geotechnical Engineer Jim Graham contacted Soil Nail Launcher, Inc. and requested a proposal to provide those emergency shoring services. Soil Nail Launcher, Inc. was awarded the contract and completed the project in only four days for a cost of approximately $40,000. Soil Nail Launcher, Inc. kept the project schedule on track.
Contact:
Jim Graham, ODOT Geotechnical Engineer
Jim.Graham@dot.state.oh.us
Bob Barrett, Soil Nail Launcher, Director
bob@soilnaillauncher.com
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Launched Soil Nails for temporary shoring kept the road above in service |
When excavation went afoul, Launched Soil Nails for temporary shoring kept the project on track |
