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Geotextile tubes: a manufacturer's perspective
Early use of geotextile tubes in the United States (prior to 1990) was dominated by the Longuard tube. This circular woven tube with a maximum diameter of 6 m was manufactured in Denmark with a combination of polypropylene and polyethylene yarns. The patented loading equipment was critical to the success of the tube filling process. The filling process used a metal box at least the size of a loader bucket to charge the hopper with the fill material. A water pump would supply the necessary water from the site, and a sand pump would pump the slurry into the tube. This process has now become outmoded. The currently recommended hopper design is at least 1.2 m in height and slopes inward and outward to a pre-installed flange inside the tube. A flange on the hopper is bolted to the flange inside the tube. This new method requires a water discharge fitting at the bottom of the hopper that creates a high-velocity water flow into the hopper and down the centerline of the tube. Today, the installation problems such as securing the discharge hose, laying out the scour apron, filling the anchor tubes, and dealing with the surge have been solved. The author discusses some of the remaining installation problems and indicates points that should be considered by geotube designers. The factors influencing the installation costs in geotube application projects are outlined.
Geotextile tubes: a manufacturer's perspective
Early use of geotextile tubes in the United States (prior to 1990) was dominated by the Longuard tube. This circular woven tube with a maximum diameter of 6 m was manufactured in Denmark with a combination of polypropylene and polyethylene yarns. The patented loading equipment was critical to the success of the tube filling process. The filling process used a metal box at least the size of a loader bucket to charge the hopper with the fill material. A water pump would supply the necessary water from the site, and a sand pump would pump the slurry into the tube. This process has now become outmoded. The currently recommended hopper design is at least 1.2 m in height and slopes inward and outward to a pre-installed flange inside the tube. A flange on the hopper is bolted to the flange inside the tube. This new method requires a water discharge fitting at the bottom of the hopper that creates a high-velocity water flow into the hopper and down the centerline of the tube. Today, the installation problems such as securing the discharge hose, laying out the scour apron, filling the anchor tubes, and dealing with the surge have been solved. The author discusses some of the remaining installation problems and indicates points that should be considered by geotube designers. The factors influencing the installation costs in geotube application projects are outlined.
Geotextile tubes: a manufacturer's perspective
Geotextilschläuche aus der Sicht des Herstellers
Bradley, A. (author)
Geotechnical Fabrics Report ; 19 ; 20-23
2001
4 Seiten, 3 Bilder
Article (Journal)
English
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