The internal structure of a lockable manhole cover mainly includes the following parts:
Manhole Cover Body: This is the most visible part of the lockable manhole cover, usually made of metal (such as ductile iron) or composite materials. It directly covers the manhole opening, serving a sealing and load-bearing function, and needs sufficient strength and toughness to withstand the pressure from vehicles, pedestrians, etc.
Locking Mechanism: This is the key structure of the lockable manhole cover. It generally consists of a lock cylinder and a latch. The lock cylinder is used to insert a key for opening and closing, while the latch, in conjunction with the manhole seat or other fixed components, locks the cover, preventing unauthorized opening.
Sealing Structure: To prevent rainwater, debris, etc., from entering the manhole, and to prevent gas leakage, the lockable manhole cover has a sealing structure. A common type is a rubber sealing ring, installed at the edge of the cover where it contacts the manhole seat, providing a good seal.
Connecting Components: These securely connect the manhole cover to the manhole seat. For example, hinges allow the cover to rotate freely, ensuring stability and operability during daily use.
