Maintenance and upkeep of ductile iron manhole covers

The maintenance of ductile iron manhole covers mainly includes the following aspects:

Regular cleaning: Remove debris such as leaves and garbage from the surface of the manhole cover to prevent blockage. Rinse the surface of the manhole cover with a high-pressure water gun to remove dirt and sediment. For stubborn stains, professional cleaning agents can be used, but it is necessary to choose cleaning agents that are non corrosive to the material of the manhole cover.

Anti corrosion treatment: Regularly remove rust on the surface of the manhole cover, apply anti-corrosion primer and topcoat to ensure even coverage and enhance the corrosion resistance of the manhole cover. Regularly check whether the anti-corrosion coating is intact, and repair it in a timely manner if there is any damage.

Inspection and maintenance of locking device: Regularly check whether the locking device of the manhole cover is intact to ensure that the manhole cover will not shift or be stolen. Lubricate the locking device to ensure its flexibility. If the locking component is found to be damaged, it should be replaced in a timely manner.

Surrounding road repair: Regularly clean the damaged road surface around the manhole cover, fill the damaged area with asphalt or concrete, and compact it to ensure a smooth road surface.

Maintain manhole cover markings: Regularly clean the markings on the surface of the manhole cover to ensure clarity and visibility. If the identification is blurry, it can be redrawn with a waterproof marker pen and replaced if necessary.

Other maintenance methods: Check the firmness and sealing performance of the manhole cover. If there is looseness or poor sealing, it needs to be replaced or fixed. For manhole covers that make noise, shock-absorbing rubber rings should be installed to reduce noise and enhance stability.

Real time monitoring: Utilizing a monitoring system to monitor the status of manhole covers in real-time, promptly identifying and addressing potential issues.

Special environmental treatment: In the presence of chloride ions, it is necessary to regularly wipe the manhole cover to keep it clean and dry. For manhole covers that have not undergone solid solution treatment, attention should be paid to their poor corrosion resistance and corresponding protective measures should be taken.