I introduced the anti-theft methods of manhole covers. Nowadays, it is rare for manhole covers to be stolen. But in the past, because of the material of manhole covers, some people would steal manhole covers and sell them for profit. Therefore, the anti-theft installation method is specially invented for this situation, which has a good anti-theft effect. At present, there are six anti-theft methods, each of which has different installation methods and effects. So let's introduce these six anti-theft methods to the manufacturers of nodular cast iron manhole covers. Let's have a look.
1. It is the iron chain connection method.
2. Hinge connection method: these two methods can not lock the nodular cast iron well cover and well ring as a whole, which is easy to open. The iron chain and hinge can be pried off with steel chisel.
3. Counter rotation technique of the stop: just rotate it in the opposite direction, and then open and take away the ductile iron manhole cover.
4. The skill method of bolt hole plugging: the hook hole is plugged with bolts and nuts, but the manhole cover can be opened and taken away as long as the two ends of an arched wire are inserted into two grooves under the bolt head.
5. It is the lock key method.
6. It is the shift fork joint linkage method: although it can lock the well cover and the ductile iron well cover as a whole, it requires high matching space and precision. It needs to cast a new well cover to match with it. The existing well cover cannot be reconstructed and used, which costs a lot of money. Moreover, it cannot solve the problem of "rust resistance". It cannot be opened by itself after being installed for about half a year, so it cannot be used in the well.
So the above are the six anti-theft methods introduced by the nodular cast iron manhole cover manufacturer. After you buy the manhole cover, you can learn more about these anti-theft methods, so that you can use these methods to achieve good anti-theft effect when installing the manhole cover. There's more Please pay attention to the official website of Hainan Plastic Industry Co., Ltd.
