River and Artificial Lake Seepage Prevention: Yulong New Town's Anti-Seepage Project Begins
The anti-seepage construction for the artificial river channel in Yulong New Town, undertaken by our company, officially commenced yesterday. The project involves the use of composite geomembrane as the primary seepage prevention material. The landscape river channel covers an area of 5,800 square meters. The materials were delivered to the site on October 28th and were sampled and tested by the client. After passing the inspection, the composite geomembrane laying work began. Due to the complex and varied shape of the channel, the construction is expected to take between 6 to 8 days. To meet the tight schedule, our company quickly mobilized experienced welding teams overnight to start the work. We hope the project will be completed smoothly and efficiently.
Composite geomembrane, also known as composite anti-seepage film, consists of a high-density polyethylene (HDPE) membrane combined with two layers of geotextile. It has a width ranging from 4 to 6 meters. The "Hongchen" brand composite geomembrane exhibits excellent physical properties such as tensile strength, tear resistance, and burst resistance. It offers high strength, good elongation, large deformation modulus, and strong resistance to acids, alkalis, corrosion, and aging. Its outstanding seepage prevention performance makes it suitable for various civil engineering applications, including seepage control, isolation, reinforcement, and crack prevention in water conservancy, municipal, construction, transportation, subway, and tunnel projects.
Thanks to the use of polymer materials and the addition of anti-aging agents during production, Hongchen composite geomembrane can perform well even in non-standard temperature environments. It is commonly used for seepage prevention in dams and drainage ditches, as well as for pollution control in waste sites. With the growing demand for environmentally friendly and durable solutions, composite geomembrane seepage prevention technology has become widely adopted.
Welding is the most critical part of the construction process. Based on years of field experience, our company has found that certain welding methods may not be ideal for specific situations. Instead, we often use cemented joints for better stability and durability. The welding method includes the following steps:
**I. Preparation Before Laying**
1. **Foundation Treatment**: The surface where the geomembrane will be laid must be cleaned thoroughly. The base should be leveled, compacted, and free of unevenness, cracks, or sharp objects like stones, wires, or sticks. Any vegetation within the seepage area should be removed, and herbicides should be applied to weeds.
2. **Protective Layer**: A layer of fine sand or clay, at least 30 cm thick, should be placed beneath the geomembrane to protect it from damage.
**II. Construction and Welding of Composite Geomembrane**
1. **Splicing and Welding**: Experienced workers from “Hongchen†will carry out the splicing and welding. An automatic temperature-regulated geomembrane welding machine will be used, along with a 700W hot air welding torch as auxiliary equipment. After the first layer of geomembrane is laid, the edges to be welded are overlapped (the factory reserves 20–25 cm for welding). The second layer is then laid over the first one. The edges are adjusted so that the overlap is between 10–15 cm. Before welding, a test should be conducted to determine the optimal welding temperature and speed. The general temperature for membrane-to-membrane welding is between 300–400°C, and the speed is typically 1.5–3 m/min. The surface of the membrane must be clean before welding.
2. **Quality Control**:
- Welding should be carried out under dry and windless conditions. Workers should wear flat or soft rubber shoes to avoid damaging the geomembrane.
- Inspections should focus on whether the welds are clear, transparent, and free of bubbles, wrinkles, or melting points.
- For testing, a 1.5–3m section of the weld is selected, sealed with a welding gun, and pressurized using a gas cylinder. The pressure is maintained at 0.5–2 MPa for about 30 seconds. If no pressure drop occurs, the weld is considered qualified.
- Unqualified welds should be repaired using a hot air welding gun. Vertical seams should not be too long, usually around 80 cm. T-joints should be handled carefully, with each layer processed separately. Excess material can be cut off after gluing to ensure a smooth surface. Damaged areas should be patched immediately using adhesive methods.
**III. Construction Speed Control**
During construction, the speed of vertical seam stitching and T-joint welding must be faster than the dam filling speed. Under the premise of quality assurance, the pace should be stable first and then gradually increased to ensure project progress.
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