Construction technology of composite geomembrane anti-seepage body

After the dam body is filled and the reservoir bottom is compacted to meet the design requirements, and the composite geomembrane impermeable body protective layer is prepared according to the design requirements, the construction technology of the composite geomembrane impermeable body is: the composite geomembrane is in place and the paving is straight → Butt joint, bottom fiber butt joint (stitching) → membrane material butt joint, hot melt pressure welding → inflation pressure (or negative pressure method) → surface fiber butt joint (sewing) → reserved capacity.

Preparing to pave two layers of fabric and one layer of membrane (composite geomembrane), and before paving geomembrane, the following preparations should be done: (1) Relatively select the composite geomembrane that meets the design requirements and national standards, and support the special type Construction tools (welding tools); (2) Entrust a third-party inspection and testing agency to re-inspect the purchased products, and enter the site in stages after the final confirmation; (3) Carry out the pre-construction production process experiment of the geomembrane construction at the construction site to clarify the welding The total width of the seam overlap, the working temperature range of the hot melt welding, the welding speed (m/min), the welding method, the repairing method of the damaged position, the welding seam without imitation cloth connection method and other process and control parameters; (4) Construction workers carry out technical training and safety briefings, interpret and need to be familiar with and grasp the operating procedures, construction techniques and technical standards. Strict labor discipline requires that the work shoes worn by the construction personnel should not destroy the materials, and do not do anything that is likely to damage the composite geomembrane, such as smoking; (5) Before laying the composite geomembrane The previous process acceptance meets the standard.