With the rapid discovery of urban construction in China, the demand for building materials is also constantly increasing. Generally speaking, composite manhole covers are mostly made of cement and cast iron, which cannot guarantee safety performance and have a relatively short service life.
The manhole cover is made of composite materials, and is generally divided into three types: steel fiber concrete inspection manhole cover, recycled resin composite material inspection manhole cover, fiberglass inspection manhole cover, and so on. Steel fiber reinforced concrete manhole cover is an improved product of the original reinforced concrete inspection manhole cover. This manhole cover is made by adding steel fibers with a length of about 2 centimeters to the concrete, and a large amount of steel fibers are dispersed in the concrete, forming an irregular radial distribution, thereby enhancing the strength of the concrete and greatly improving the toughness of the manhole cover.
The bending tensile strength of composite manhole covers and the fatigue cracking strength of manhole covers can simultaneously reduce the crack width. In order to reduce the collapse of manhole covers during use, the strength of manhole covers with metal frames is generally increased by more than 30% compared to ordinary manhole covers of the same proportion, and the performance of manhole covers is similar to that of cast iron inspection manhole covers. The manhole cover has the characteristics of low manufacturing cost, low recycling value, and theft prevention. Therefore, manhole covers have a certain share in the market, but they have obvious defects such as large volume, difficulty in opening shoulders, and insufficient bearing capacity.
The above is about the material characteristics of composite manhole covers. Due to its characteristics and advantages, its application rate is becoming increasingly common. Once again, I would like to remind everyone that during the construction process, it is necessary to choose a suitable manhole cover based on the actual situation and add the correct construction method in order to achieve good results.
By shape: circular, square, and rectangular.
According to pressure: light, ordinary, heavy, overweight.
Materials: ductile iron manhole covers, cast iron manhole covers, stainless steel manhole covers, bronze manhole covers, high-strength steel fiber cement concrete manhole covers, reinforced glass fiber reinforced plastic manhole covers, resin molded plastic manhole covers, resin recycled manhole covers.
Users: Municipal public utilities such as tap water, telecommunications, electricity, gas, heating, firefighting, and sanitation.