{"id":266,"date":"2023-11-02T10:43:02","date_gmt":"2023-11-02T10:43:02","guid":{"rendered":"https:\/\/www.geostabilization.com\/ca\/?page_id=266"},"modified":"2025-12-22T18:21:25","modified_gmt":"2025-12-22T18:21:25","slug":"soil-nail-launcher","status":"publish","type":"page","link":"https:\/\/www.geostabilization.com\/ca\/techniques\/technology\/soil-nail-launcher\/","title":{"rendered":"Soil Nail Launcher\u2122 \u2013 Advanced Soil Nailing Technology"},"content":{"rendered":"\n
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Soil Nail Launcher\u2122<\/h4>\n

Our Advanced Soil Nailing Technology<\/h2>\n

Originally developed by the British military to launch chemical weapons, the Soil Nail Launcher\u2122 is a compressed air cannon that can accelerate a 1.5 inch (38mm) diameter, 20 foot (6.5m) long steel or fiberglass tube to 250 miles per hour (400 kph) in a single shot.<\/p>\n

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How the Soil Nail Launcher\u2122 Works<\/h3>\n

The compressed air cannon induces tensile stresses in each tube as it penetrates the ground. This tension counteracts the compressive stresses induced by the displaced soil and thereby prevents nail buckling. The single impulse, high-installation velocity creates a shock wave at the nail tip, which displaces the adjacent soil as the nail penetrates. Nail penetration ceases when accumulated frictional resistance of the soil at the nail tip is sufficient to dissipate the installation energy imparted by the cannon. Bars enter the earth without significant abrasion or loss of exterior corrosion protection. The soil particles then collapse onto the bar in a relatively undisturbed state, yielding pullout capacities up to 10 times that of driven or vibrated rods or tubes. Lastly, soil nailing<\/a> increases soil density in the nailed area. In contrast, conventional open-hole drilling techniques allow the soil to relax prior to installation, which can adversely affect bond capacity.<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n\n\n

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A Closer Look<\/h3>\n

Launched Soil Nails also can be perforated to allow for horizontal drainage and pore water pressure relief, and are the only technology available that provides continuous axial capacity and drainage with the same element. Alternately, the perforated nails can be pressure grouted with a variety of materials to increase bond capacity and soil properties throughout the nailed region. Once pressure grouted, an epoxy-coated inner bar can be installed inside the tube, creating a robust, corrosion resistant launched SuperNails\u00ae<\/a>.<\/p>\n

The Soil Nail Launcher\u2122 typically is mounted on a modified tracked excavator. However, it can be mounted on vehicles, long reach excavators, or crane basket frames. It weighs about 2 tons (1.8 metric tons), making it portable and able to reach remote locations. The launcher unit has full articulation, allowing it to work around overhead wires, underground utilities, and guard rail.<\/p>\n

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Advantages of Launched Soil Nails<\/h3>\n

Advantages are immediate contribution to stability, high rate of production, low impact access and competitive costs. Tests confirm that the nail\/soil bond is typically higher than nails installed with traditional drilling methods. Both ungalvanized and galvanized bar will survive for a very long time in most soil environments.<\/p>\n

Research by the United States Forest Service<\/a>, the Federal Highway Administration<\/a>, and three state departments of transportation sponsored a 1992 demonstration project for the Soil Nail Launcher. Those agencies spent over $250,000 and concluded that this new tool was a faster and less expensive way to install soil nails in some situations. EM 7170-12A \u201cApplication Guide for Launched Soil Nails\u201d contains some of their findings.<\/p>\n

The second Strategic Highway Research Program (SHRP2) recently selected launched soil nailing as a technology that achieved their goals of providing: 1. Rapid renewal of transportation facilities; 2. Minimal disruption of traffic; and 3. Production of long-lived facilities. Their most recent work, titled \u201cGeotechnical Solutions for Soil Improvement, Rapid Embankment Construction, and Stabilization of the Pavement Working Platform<\/strong><\/em>\u201d was sponsored by the Federal Highway Administration in cooperation with the American Association of State Highway and Transportation Officials (AASHTO)<\/a>, and was administered by the Transportation Research Board<\/a> of The National Academies<\/a>. Read more about the study at geotechtools.org<\/a>.<\/p>\n

Advantages are immediate contribution to stability, high rate of production, low impact access and competitive costs. Tests confirm that the nail\/soil bond is typically higher than nails installed with traditional drilling methods. Both ungalvanized and galvanized bar will survive for a very long time in most soil environments.<\/p>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n\n\n

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