Regular Maintenance and Replacement of Manhole Cover

Manhole covers, as an indispensable part of urban infrastructure, play a particularly prominent role and importance in maintaining urban operations and ensuring public safety.

1、 Regular Maintenance of Manhole Cover          

Cleaning work:

Clean the surface and surrounding environment: Regularly clean the surface and surrounding environment of the manhole cover, use high-pressure water guns and professional cleaning agents to remove dirt and stubborn stains, prevent blockages and water accumulation, and ensure smooth drainage.

Cleaning drainage outlet: For drainage manhole cover, the drainage outlet should be cleaned regularly to avoid blockage by water, mud, sand, slag, debris, leaves, etc.

Anti corrosion treatment:

Removing rust: The manhole cover is prone to corrosion when exposed to the external environment for a long time, and the rust on the surface of the manhole cover needs to be removed regularly.

Apply anti-corrosion paint: Apply anti-corrosion primer and topcoat to ensure even coverage, regularly inspect the anti-corrosion layer, and promptly repair damaged areas.

Check the locking device:

Check the status of the locking device: Regularly check whether the locking device of the manhole cover is intact, ensure its normal operation, and prevent the manhole cover from shifting and being stolen.

Lubrication locking device: To ensure its flexibility, the locking device should be lubricated.

Replace damaged components: Replace damaged locking components in a timely manner, check the rust prevention of the locking device, and perform rust prevention treatment if necessary.

Surrounding road repair:

Repairing damaged road surface: The road surface around the manhole cover  is easily damaged by wheel impact and needs to be repaired regularly to ensure the firmness of the manhole cover and the smoothness of the road surface.

Fill with asphalt or concrete: For damaged areas, fill with asphalt or concrete and compact the filling material to ensure it is level with the surrounding road surface.

Maintain identification:

Cleaning and redrawing of markings: The markings on the manhole cover provide important information and need to be regularly cleaned and blurred markings redrawn to ensure clarity and visibility.

Safety Warning:

Set up safety warning signs: Set up safety warning signs and prompts around the manhole cover to remind pedestrians and drivers to pay attention to the safety of the manhole cover.

2、 Replacement of Manhole Cover      

The specific steps for replacing manhole cover include:

On site layout: Prior to replacement, arrange the site by enclosing the surrounding area of the manhole cover and placing warning signs.

Road cutting and excavation:

Use a parabolic cutting machine to cut the road surface around the manhole cover.

Clean up the debris, use a hydraulic power station to crush the surrounding structure of the manhole cover, and remove the old manhole cover.

Install new manhole cover and accessories:

Install the adjustment ring and well ring, ensuring that the top of the adjustment ring is at an appropriate distance from the road surface elevation.

Place the installation limit well ring into the adjustment ring and adjust it to the appropriate height.

Spraying emulsified asphalt increases the adhesion between the filling asphalt and the foundation.

Fill the asphalt layer by layer and compact it to ensure its compactness.

Install a new manhole cover and use a roller to compact the surrounding area of the manhole cover to ensure smoothness with the road surface.

Clearing and opening up traffic:

Clean up residual asphalt and debris around the manhole cover and on the road surface.

Open traffic after the asphalt has completely cooled down.

In summary, regular maintenance and replacement of manhole covers are important measures to ensure the normal operation of urban infrastructure and the safe travel of citizens. Through regular cleaning, anti-corrosion treatment, inspection of locking devices, repair of surrounding roads, maintenance of signs, and safety warnings, the service life of manhole covers can be extended and their safety can be improved. At the same time, replace the manhole cover as necessary to ensure that it meets the usage requirements and safety standards.

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