How to Test the Welding Seam of Anti-seepage Geomembrane Testing Project?
It is reported that as early as the 1970s and 1980s in Europe, anti-seepage geomembra Development and environmental protection issues have become the top priority. In November 2016, the State Environmental Protection Administration officially changed its name to the Ministry of Ecology and Environment, which shows the importance attached to the ecological environment and the gradual improvement of national environmental protection awareness. It is vigorously advocated and widely used, and it has played a "most incisive" role in the anti-seepage main body of environmental protection projects.
How to test the welded seam of impermeable geomembrane?
When welding, the overlap between the anti-seepage membranes should not be less than 10 cm. At the same time, reducing the welding seam as much as possible can save the cost of materials and improve the stability of the anti-seepage system. Generally, there are two ways to detect the welding seam: the first is to use the air pump, the pressure gauge and the hollow needle to detect; the second method is to use the vacuum pump to detect. The first method requires inserting a hollow needle into the welding seam to pressurize the entire welding seam and block the two edges of the welding seam, and then detect the change of air pressure. The second method does not require damage to the impermeable membrane. Apply soap liquid to press the vacuum pump to pressurize the soap liquid, and detect the change of airtight air pressure in the welding seam. The air pressure of the air pump can reach and maintain 250KPA within 2 minutes, and then observe for 10 minutes. The allowable air pressure reduction range is 10KPA. If the drop is greater than 10KPA, the welding is unqualified, and it needs to be repeated more than ten times.
The anti-seepage geomembrane is referred to as the anti-seepage membrane, and its main function is to prevent seepage and isolate. The normal specification is 6 meters in width X 50 meters in length and 300 square meters in a roll. Since this width and length cannot meet the needs of large engineering projects, double-track hot-melt welding machine welding or KS hot-melt adhesive (geotechnical) is required during the laying process. Of course, small-area fish ponds or lotus ponds can be bonded with KS hot-melt adhesives considering the cost. For large projects, technicians and construction masters need to be arranged to guide and construct welding. Anti-seepage geomembrane has "great power" in anti-seepage systems of various environmental protection projects.