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What Is The Principle Of Anti-Theft Manhole Cover

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Manhole covers are closed at the top of the entrance and exit of underground facilities and drain underground. SMC polymer resin composite manhole cover to meet pipeline installation equipment, in this project, along the pipe
SMC polymer resin composite manhole cover can withstand SMC polymer resin composite manhole cover SMC polymer resin composite manhole cover
SMC polymer resin composite manhole covers on urban public roads or on single highways.
Internal structure of anti-theft manhole cover
More than 100 manhole cover anti-theft devices mainly use six methods: one is the iron chain connection method, the other is the hinge connection method, the three-end anti-rotation technology, and the fourth is the bolt plug
Plug technology, the fifth is the lock key method. Six is ??the fork joint method.
Among them, the first and second cannot lock the manhole cover and the well ring, and are easy to open. Steel chains can be used to break iron chains and hinges; the third type can only be opened and moved by reverse rotation
Manhole cover; the fourth type uses bolts and nuts to plug the hook holes, but as long as the ends of the bent wire are inserted into the two slots below the bolt head, the manhole cover can be opened and removed;
Although five or six types can lock the manhole cover and the well ring together, but the requirements for matching space and matching accuracy are very high, it is necessary to cast a new manhole cover to match it.
It is not possible to refurbish an existing manhole cover, which is expensive and does not solve the problem. The problem of rust is dead. It can't open for about half a year, it can't go smoothly. therefore,
The various types of manhole cover anti-theft devices are not satisfactory.
manhole cover
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