Under the bright and eye-catching high-rise buildings, those manhole covers that are extremely easy to ignore on weekdays are actually silently testing the conscience and wisdom of city managers. For urban infrastructure such as manhole covers, can a uniform national standard be established in production, and there are normative requirements in terms of materials, thickness, and manufacturing processes, and the manhole covers manufactured by the Ministry of Fuel Industry in 1953 are marked with manufacturing or Supervision department. This will not only facilitate the traceability of responsibilities in the event of problems, but also these marks will themselves constitute a city's memory of the times.
In the 21st century, composite manhole covers seem to occupy most of the market. The composite manhole covers are made of polymer composite material bmc group molding compound with internal steel frame support. After high temperature molding, the composite material has no recycling value and has the characteristics of active anti-theft. The manhole cover has a dangerous accident due to theft. It has strong acid and alkali resistance and can be used in areas with high acidity and alkalinity such as chemical plants. The antistatic effect is also very obvious. No matter how it is hit, there will be no sparks on the surface of the manhole cover. This is very suitable for gas stations. The bottom structure of the pot is adopted, and the middle thick edge of the manhole cover is thin, which is conducive to the rapid dispersion of the force and enhances the bearing capacity of the manhole cover. Our new manhole cover is also designed with a locking device, which will not cause problems such as cap lifting and cap jumping when passing vehicles, which increases the safety performance of the manhole cover. The manhole covers in residential areas need noise problems. Noise pollution is also a kind of pollution, especially when everyone is resting at noon and at night, the noise will affect everyone's sleep quality. Therefore, we have installed shock-absorbing rubber rings on the manhole covers. Don't be afraid to be noisy during the break.
