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22 23 Storage Leave the panels packaged in UV protected wrap until the day that the panels are to be installed . If extremely hot or cold temperatures are present, keep the panels inside at a moderate temperature . This reduces the force required to unfold the panels . Fabricated panels, when possible, should be stored on pallets off the ground . The storage area should be dry, level, and with a firm base to facilitate lifting; so the panels are not damaged, do not become dirty, and remain dry externally and internally . Installation Subgrade Preparation A pre-installation inspection shall be requested by the geomembrane installer and ALL interested parties before moving panels from the storage location to the placement area . If the subgrade is deemed to be inappropriate for any reason, it should be remediated prior to geomembrane movement and placement . Subgrade surfaces should be free of loose rock fragments (>10 mm or 0 .4 inches), sticks, sharp objects, or debris of any kind . The surface should provide a smooth, flat, firm, unyielding foundation for the geomembrane with no sudden, sharp or abrupt changes or break in grade that can tear or damage the geomembrane . No standing water, mud, vegetation, snow, frozen subgrade, or excessive moisture is allowed before geomembrane placement . All pipes, drains, fitting, etc ., which are to be installed beneath the geomembrane, should be in place, backfilled, and ready to be covered with the geomembrane before panel deployment . An anchor trench in the shape of a “U” or “V” can be used as a perimeter termination point for the geomembrane . Installation of the geomembrane shall be started from the anchor trench . Unfolding and Deploying Prefabricated Panels The geomembrane shall be supplied as a continuous panel with factory seams in the panel to reduce the amount of field seaming and testing . Fabricated geomembrane panels are normally placed at a starting point on one corner of the area to be lined . The deployment markings on the packaging or label indicate which direction the panel will unfold . Note accordion-folded and rolled panels will unroll in only one principal direction while double accordion-folded panels may unfold in either principal direction . While unrolling and/or unfolding the geomembrane, inspect the fabricated panel for proper material type and thickness, damage, and/or defects . Repair any damage found . Provide suitable wind uplift protection with sandbags (dirt) or other ballast (such as rolls of geotextile) after the geomembrane panel is unfolded . Only material that is to be immediately welded, i .e ., during that work-day, should be deployed . Once the geomembrane is properly placed, the material should be seamed as soon as practical . Field Seaming A large advantage of factory fabricated geomembranes is that manufactured rolls of materialcan be fabricated into large panels in a factory before shipment to the project site . This minimizes the amount of the field seaming and maximizes the amount of factory seaming which results in more high quality seams . In particular, the individual widths of the manufactured geomembrane rolls shall be assembled into large panels that are custom- designed for the specific project and correspond to the panel layout diagram . If factory seaming is maximized, field seaming can be reduced by 80 to 95 % . In other words, only 5 to 20% of all seams need to be made in the field depending on the unit weight of the geomembrane material . This reduction in field seaming improves seam quality, accelerates construction, minimizes or eliminates destructive field seam tests, reduces weather exposure issues, allows modular construction, and reduces project costs . Field Cleaning of Seams After the panels are initially placed in the proper position, remove as many wrinkles as practical . If possible, allow the panels to “relax” by allowing the panel to warm in the sun . The edges to be seamed need to be smooth and free of wrinkles to ensure good field seams and no “fish mouths .” An overlap of 0 .15m (6 inches) for thermal seaming and 100 – 150 mm (4 – 6 inches) for tape seaming must be cleaned of all dust, dirt, water, and foreign debris no more than 30 minutes prior to the seaming operation . Only clean, soft rags should be used for cleaning the areas to be seamed . The seaming operation requires a solid, dry, smooth subsurface (see section 3 .01 A Subgrade Preparation) . During the cleaning operation, the Geomembrane sheets will be inspected for proper type, thickness, and defective areas which must be removed and/or repaired prior to seaming . Field Seaming Lightweight reinforced geomembranes are mainly used as a containment barrier for water or other liquids (see Section 1 .01 C above) . For this reason, seaming the geomembranes is a vital factor in the installation process . For most projects, field seams should be run perpendicular to the slope . Reinforced Factory Fabricated Lightweight Geomembrane Panels can be field seamed by either of the following methods: • Field Thermal Seaming (automated hot edge or hot air welding machine) • Field Tape Seaming Extrusion welding is not included in the field seaming list because it is not recommended for geomembranes less than 40 mil (1 .0 mm) thick . Field Thermal Seaming (solid wedge only) Thermal seaming is performed with an automated hot wedge or hot air welding machine, which uses a heated element to melt the geomembranes to be welded and then presses the two melted sheets together to form a fusion bond . When performed properly, wedge welders produce high quality and consistent seams . The wedge in a hot wedge welder can be heated with hot air (hot air method), or with electric resistance heating (hot wedge method) . It is common to weld fabric supported material with a hot air wedge welder . All wedge welders employ a set point controller to accurately maintain the welding temperature within the most efficient welding temperature for the material . The pressure wheels are normally adjustable to allow for good material bonding after heating . The single (or solid) wedge arrangement produces a fully bonded weld not less than 25 mm (1 inch) in width . Seaming with a wedge welder is to be undertaken only by persons that have been trained and qualified in the use of the equipment (see section 2 .01 B above) . Repairs, maintenance, adjustments, and modifications are to be performed only by trained personnel . Temperature controllers on the thermal welding device should be set according to type of geomembrane, thickness, ambient temperature, type of heating (air v . wedge), rate of Installation Instructions Page 3 of 9 Installation Instructions Page 4 of 9 InterWrap.com CANADA | USA | EUROPE | INDIA | CHINA CANADA | USA | EUROPE | INDIA | CHINA InterWrap.comPDF Image | GEOMEMBRANES
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