"It's a headache to encounter the manhole cover on the road when driving. If you roll it carelessly, the vehicle will bump at least, or damage the vehicle or even have a traffic accident. It's a good thing to replace these old well covers now! ". Urban construction is inseparable from various pipe networks and observation wells such as water supply and drainage. Due to the needs of construction and maintenance, many observation wells remain on the motorway. After these observation wells have been continuously rolled by vehicles for a long time, they will collapse, sink and damage to varying degrees, which will not only affect the city image, but also have potential traffic safety hazards. Because the well Manhole cover is uneven with the road after sinking or tilting, whenever a vehicle passes through the well cover, it will make a "clang, clang" sound. Sometimes when the well cover is damaged and the driver has no time to avoid, the wheels will jam at the wellhead, damage the vehicle and even cause a traffic accident.
China has replaced well Cast Iron Manhole Cover set on motor and non motor lanes. ductile iron manhole cover cover is changed from the previous ordinary Ductile manhole cover to nodular cast iron well Manhole Cover. There are three clips on the well hoop to connect the well cover with the well hoop, and there is a rubber ring at the contact between the well cover and the well hoop, which can reduce the noise caused by metal collision. BMH cold mix and cold paving asphalt mixture composed of organic high molecular polymer is used for filling pavement. This material has good adhesion and can be paved and compacted on the construction site without affecting vehicle traffic for a long time due to construction. According to Lu biyou, an engineer of Changji Tingzhou Haotai road and Bridge Co., Ltd., which is under construction on site, this new well cover also has the advantages of "five prevention", that is, anti theft, anti settlement, anti collapse, anti displacement and anti noise, and can withstand the rolling of 100 tons of heavy trucks. Many cities have replaced all well covers on the eve of national day on October 1. After replacing the new well cover, it will not only increase the flatness of the motorway pavement, but also improve the traffic safety of urban roads. "
