The manhole cover has high strength, low price and beautiful appearance. It can be arbitrarily colored, convenient for installation, maintenance and identification. Because it has no recycling value, it completely solves the problem of anti-theft. In the next three to five years, China will gradually switch to composite manhole covers, which has a large market potential.
The composite manhole cover has high strength, low price and beautiful appearance. It can be arbitrarily colored, convenient for installation, maintenance and identification. Because it has no recycling value, it completely solves the problem of anti-theft. In the next three to five years, China will gradually switch to composite manhole covers, which has a large market potential. Its advantage is that it is not reinforced with steel framework, but reinforced with glass fiber composite, which belongs to GRC type products. Therefore, it has the advantage of being unaffected when steel prices keep rising. Because it does not contain a little iron, it is more resistant to theft than stone plastic and fiber concrete manhole covers. Its comprehensive performance lies between the stone plastic manhole cover and the concrete manhole cover, which is superior to concrete; it can be applied to occasions with high requirements on the manhole cover technology.
Fiber-reinforced materials are widely used in composite materials, and the amount is relatively large. For example, carbon fiber and epoxy resin composite materials have specific strength and specific modulus that are several times larger than steel and aluminum alloys. Creep, noise reduction, electrical insulation and other properties. Composite of graphite fiber and resin can obtain a material with an expansion coefficient almost equal to zero. Another feature of fiber reinforced materials is anisotropy, so the fiber arrangement can be designed according to the strength requirements of different parts of the product. Aluminum-based composite materials reinforced with carbon fibers and silicon carbide fibers can still maintain sufficient strength and modulus at 500 ° C.