The structure of geomembrane
connection includes connection, welding and vulcanization methods. The connection method used in specific engineering practices should be reasonably selected according to different anti-seepage requirements and the characteristics of the selected geomembrane. The connection between the geomembrane and the surrounding boundary needs to be tightly connected to block the filtration inlet and cut off the lateral filtration path. When the water level drops sharply, prevent water seepage into the lower surface of the geomembrane, blistering and swelling and destroying the geomembrane.
Therefore, during the construction process, it is necessary to excavate anchor trenches on the embankment foundation and slope, and bury geomembrane in the trenches. For river beds with overburden layers, if the buried depth of the bedrock is relatively shallow, it is usually necessary to dig to the bottom of the rock, and then pour a concrete foundation to anchor the geomembrane or directly bury the geomembrane. On the concrete foundation; if the depth of the bedrock is large, the geomembrane covering method is generally used to prevent leakage. For impermeable clayey soil foundations, anchor trenches can be dug directly and filled with clay after being buried in geomembrane.
The quality of the geomembrane connection is the key to the success or failure of the geomembrane's anti-seepage performance, so joint inspections of the geomembrane must be carried out to ensure the quality of the joint.
There are several kinds of detection methods: 1. Visual inspection, 2. On-site leak detection. Check the connection visually: after the geomembrane, check whether the joint is missing, whether the joint is burnt, whether the wrinkle is uniform, whether the splicing is uniform, etc. Used for on-site leak detection: There are two types of inflation method and vacuum method, which should be selected according to specific conditions.