Severely damaged road surface

    Urban roads contain various types of inspection wells, including stormwater and sewage inspection wells, power wells, telecommunications wells, water supply pipe wells, and gas pipeline wells. These wells are prone to loosening and sinking, posing safety hazards to vehicle traffic. To create a comfortable and safe driving environment, ensure the road surface remains in good working condition, and meet the "quick in, quick out" requirements of urban road maintenance construction, the Chongqing Municipal Facilities Administration has, through years of inspection well maintenance and remediation, successfully developed a proven, effective construction method for treating inspection wells. This method replaces old-style covers with high-strength, high-performance self-adjusting anti-settlement manhole covers, solving problems of road surface flatness, settlement, and noise, and achieving good social and economic benefits.
    The self-adjusting anti-settlement manhole cover uses a special frame structure to change the connection between the frame and the manhole base from the original "pier-and-base" type to a "socket-and-spigot" type. The large frame sits on the asphalt pavement with no external hinge, and bears pressure through the sides and top of the frame, greatly reducing the load on the manhole and effectively solving road surface settlement and damage problems. In addition, a three-point spring-arm locking device secures the cover and frame, preventing cover bouncing and reducing noise.
　　Thin bridge deck overlays reduce minor traffic accidents
As traffic volumes continue to grow, the conflict between maintenance and traffic has become increasingly prominent. To resolve this conflict, the Municipal Facilities Administration introduced rapid concrete bridge deck repair technology from abroad and from developed coastal regions, and improved it multiple times to suit local conditions in Chongqing. It has now been successfully applied to the Xingfa Bridge and Yanggongqiao Interchange in Yuzhong District.
In recent years, Chongqing's urban roads have begun large-scale "white-to-black" conversion (from concrete to asphalt). The Municipal Facilities Administration introduced thin-layer bridge deck paving technology, effectively resolving the conflict between bridge safety and driving comfort. This technology has been used in the remediation of Gaojiahuayuan Bridge, Yanggongqiao Interchange, and Xingfa Bridge with good results. It has the following characteristics:
    1. It has a relatively high surface friction coefficient, increasing driving friction resistance and providing good braking effect, which can reduce the probability of accidents to a certain extent and greatly help safe driving.
    2. It has good road surface drainage performance.
    3. It has a good noise-reduction effect. The fine structure made with aggregate has sound-conducting properties, and the noise-reduction effect is significant when used on concrete pavements.