Views: 0 Author: Site Editor Publish Time: 2022-10-24 Origin: Site
HDPE geomembrane is a synthetic membrane liner or barrier with very low permeability that can be used with any geotechnical engineering-related materials to control fluid or gas migration in the structural system of man-made projects. It has high physical and mechanical property indexes such as tensile, tear resistance, top breaking, etc. The product has high strength, better elongation, large deformation modulus, acid and alkali resistance, corrosion resistance, aging resistance, good impermeability, etc.
HDPE geomembrane can meet the civil engineering needs of water conservancy, municipal, construction, traffic, subway, tunnel, engineering construction such as seepage control, isolation, reinforcement, anti-cracking reinforcement, etc. It can be used in an unconventional temperature environment due to the use of polymer materials and the addition of an anti-aging agent in the production process. It is often used for the impermeable treatment of dams, drainage ditches, and anti-fouling treatment of waste sites.
Here is the content list:
Points to note when using HDPE geomembranes
Recommendations for using HDPE geomembranes
HDPE geomembrane protects the impermeable layer from damage. To reduce UV exposure and increase aging resistance, it is best laid using the buried method. In construction, the substrate should first be leveled with smaller sand or clay, and then the textured HDPE geomembrane should be laid. The geomembrane should not be too tight, the two ends buried in the soil part are corrugated, and finally in the laid geomembrane with fine sand or clay lay a layer of about 10cm excessive layer. Lay a 20-30cm stone for the protection layer. During construction, try to avoid stones directly on the geomembrane, it is better to lay the membrane while the construction of the protective layer. HDPE geomembrane should be connected with the surrounding structures using expansion bolts and steel plate crimping anchor, the connection part should be painted with emulsified asphalt bonding to prevent leakage.
The seam treatment of HDPE geomembrane is a key process, which directly affects the seepage control effect. General jointing methods are as follows:
1. Lap joint: lap joint width should be greater than 15cm.
2. Heat welding: suitable for slightly thicker geomembrane substrate, weld lap width of not less than 5CM. not recommended for gluing, long time water immersion easy to open glue, poor seepage control effect.
According to years of practice, the thickness of the geomembrane is not less than 0.25mm, too thin may produce porosity, and easy to be damaged in construction and reduce the effect of seepage control. In geomembrane construction, special attention should be paid to not laying too tight, not wrinkling, or splicing the firm. To strictly follow the technical specifications of the construction, the preparation, laying, splicing, inspection and backfill, and other five quality pass.
1. Strengthen the protection and management ofHDPE geomembrane, improve the waterproof awareness of relevant construction personnel, ensure the quality of the project, and put it into normal operation on schedule. Has a very important significance.
2. It is recommended that the contractor notify and send a person to supervise, and waterproofing materials related to the construction staff found that the HDPE geomembrane breakage, to promptly notify the waterproofing construction personnel to repair.
3. Geomembrane must prevent sticking to oil, otherwise, it will reduce the bonding strength.
4. HDPE geomembrane welding for finished products, must first do the lake bottom mortar protective layer. Geomembrane and wall paste must prevent the emergence of a large area of the empty drum.
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