Geomembrane

Carry out the entrance inspection of the composite geomembrane carefully

2020-10-28

In the process of purchasing composite geomembrane, it is necessary to select a composite geomembrane product that meets the specific project and has operational performance according to the characteristics of the project, design plan and related inspection and test regulations. The composite geomembrane must be inspected carefully. The composite geomembrane products entering the site must have detailed certificates, performance parameters and operation manuals. After sampling inspections and considering the engineering requirements, they cannot enter the site for construction.



During the laying process of composite geomembrane, the laying construction should be carried out in strict accordance with the design plan, construction layout, and construction treatment methods and technical measures approved by the engineer. The constructor must wear thick-soled sports shoes or soft-soled rubber shoes when laying, and make effective construction arrangements according to the strength of the construction technology to ensure that laying, welding and stamping are carried out during laying. The length of the cladding needs to be effectively determined according to the construction site. In addition, the connection of the anti-seepage geomembrane and other structures is also carried out. In order to consider specific construction requirements, it is necessary to ensure that the foundation soil under the buffer layer has sufficient compaction. Before laying composite geomembrane, various preparations and experiments must be done.

Dynamic monitoring of the process of improving the welding quality of impermeable geomembrane: estimation method. Please carefully observe the welding connection of the composite geomembrane for leaks, heat damage, wrinkles, etc. If there is any problem, please use welding repair immediately. Preventive measures (2) On-site pumping (water injection) leak detection method. When using the pumping method to check the welding quality, the welding is the inner cavity. Please keep more than 10cm during the dual frequency. After blocking both sides of the measured section, insert a 0.08MPa air needle and pull it up, and observe the negative pressure gauge for 5 minutes. If the standard air pressure does not drop, there is no leakage problem, which means that the welding quality has reached the standard. Otherwise, the original prisoner of the steam leak must be carefully searched, and effective measures must be taken to solve it immediately.

For the water injection method, use a water needle with a working pressure of 0.05 MPa ~ 0.1 MPa to inject colored water, and observe for 1 minute. If it does not appear, water leakage indicates that the welding quality is qualified. Otherwise, it is necessary to carefully search for the original unit that leaked, take effective measures, and fix it immediately. In addition, during the entire process of laying and backfilling the composite geomembrane, it is necessary to dynamically check the flatness, wrinkles, fecal leakage, welding cracks and other issues of the anti-seepage geomembrane according to the construction situation on site, and deal with and timely remedy the possible product quality. problem.

The joint construction quality inspection should be carried out in accordance with the dynamic inspection during the whole construction process and the sampling inspection after laying. The sampling inspection should be carried out in accordance with the sampling regulations of about 50m. The tensile strength materials should be carefully tested, and the compressive strength should ensure that the butt welding is more than 80% , The test piece is at the interface, otherwise the seam does not meet the quality regulations.
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