- Improve the water resistance of dam bag rubber
Use more aging resistant materials and formulas, improve processing technology and dam bag mechanism measures.
- Improve the water resistance of dam bag rubber
The dam bag is immersed in water for a long time and is easily aging due to erosion. This shows that the water medium is a major factor in the aging of the dam bag, so it is necessary to improve the water resistance of the dam bag rubber. At present, the domestically produced rubber dam bags mostly use general-purpose chloroprene rubber and a small amount of natural rubber as the main materials, and use magnesium oxide as the vulcanization system. Since the molecular structure of neoprene and natural rubber contains double bonds, they are prone to aging, especially susceptible to the effects of ozone. In addition, because neoprene rubber contains polar chlorine atoms, which are hydrophilic groups, and the formula contains components such as magnesium oxide that are easy to absorb water, the water resistance is greatly affected. Improving the current formula, using water-resistant materials and hydrophobic additives, and adding high-efficiency anti-aging agents that are not dissolved or extracted by water can improve the water-resistant and anti-aging ability of the dam bag. For example, the use of more aging and water-resistant rubber, such as ethylene propylene rubber, chlorosulfonated polyethylene, etc., and the use of high-strength, aging-resistant fibers and tear-resistant canvas to make dam bags are the main factors to improve the service life of rubber dams. way.
- Use protective coating
The use of protective coatings is a physical method of anti-aging. Coating anti-aging materials on the surface of the rubber dam bag can hinder the effect of external aging factors, slow down the aging process of the dam bag, and extend its service life. The anti-aging coating is applied to the surface of the dam bag, which is especially suitable for the protection of the dam bag after aging after use. When applying the anti-aging layer, the dam bag should be in an inflated state, just like steel paint for rust prevention, and it can be used repeatedly. Therefore, this is a simple and effective anti-aging measure. There are three kinds of coating materials in China: one is modified neoprene rubber paste; the other is polychloroester paint; and the third is chlorosulfonated polyethylene paint. They have been used in the rubber dam bags of Hongxiuquan Reservoir in Guangdong, the rubber dam bags of Beijing Youanmen and the rubber dam bags of Lingxi Gate in Lingbi County, Anhui Province. They have good anti-aging effects and prolong the service life of the dam bags. At present, the rubber dam bag has an improved formula and basically does not need to be protected by a coating. However, there is still a chance to use the above-mentioned coating for anti-aging treatment at stress concentration areas such as dam bag folds, which is also an effective measure to extend the service life of the dam bag.
- Adopt anti-aging composite layer
The use of anti-aging materials such as chlorosulfonated polyethylene on the outer layer of the dam bag to make the anti-aging composite layer of the film is also an effective measure to improve the aging resistance of the current dam bag formula. This protective layer is compounded by hot pressing and vulcanization in the production process of the factory, and the adhesion is firmer and the anti-aging effect is better.
- Reasonable hydraulic structure design
Reasonable hydraulic structure design can avoid folds and buckling of the dam bag. If the end is anchored to the dam, the slope of the end wall or middle pier should not be too steep to avoid folds and serious buckling of the dam bag at the slope toe. In addition, the anchoring structure cannot rely on concentrated stress to anchor the dam bag. Excessive concentration of stress will accelerate the aging speed of the dam bag; if the dam bag is improperly installed, the dam bag will also appear wrinkles, flexure and uneven stress distribution, such as uneven anchoring grooves, etc., which will cause the dam bag to pass through. The tensile force is uneven; or the length of the dam bag is inaccurate, and the dam bag tape that grows out is concentrated in one place to form wrinkles. For example, there are two pieces of tape downstream of the rubber dam bag of a certain reservoir, and there are wrinkles during installation, the place is seriously aging and there are obvious cracks.
- Scientific management method
The scientific management of rubber dam bags is particularly important. If the rubber layer of the dam bag appears chalking, cracking, delamination, etc., it should be dealt with in time to prevent the deepening of aging, and even damage the canvas, aging, etc., and shorten the service life.
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