In the past, there have been cases where manhole covers have been stolen, but in recent times we have rarely heard of such incidents, mainly because of the installation of anti-theft manhole covers. Let me introduce you to some of the anti-theft manhole covers. form.
The manhole cover and the hoop lock are integrated, easy to open, and the iron chain and hinge can be broken off with steel brazing; although the manhole cover and the hoop ring can be locked as a whole, the requirements for the matching space and precision are high, and a new manhole cover needs to be cast Cooperating with it, the existing manhole cover cannot be transformed and used, which is quite costly, and cannot solve the problem of “rust prevention”. After about half a year of installation, it cannot open itself and cannot go down the well.
The holes of the iron hook are blocked with bolts and nuts, but as long as the ends of an arched wire are inserted into the two grooves under the bolt head, the manhole cover can be opened and removed; Once in place, you can open and remove the manhole cover.
The form of anti-theft that we have introduced to our friends above can actually tell why there are so few reasons to hear about the theft of manhole covers.
The noise-proof cast iron manhole cover is composed of a manhole cover, a manhole cover seat, a groove for installing an anti-noise rubber strip, an anti-noise rubber strip, an engagement screw hole for connecting the anti-noise rubber strip and the manhole cover seat, etc. An elastic buffer layer is sandwiched between the touch surfaces, which can effectively avoid the noise when the manhole cover is used. The layout is simple and reliable, the manufacturing device technology is not messy, and the raw material is saved, and the manhole cover is cheap.
Therefore, it has extremely practical meanings on road construction and maintenance and its reduction of urban noise, and it is also simply promoted in municipal equipment.
1. Noise-proof cast iron manhole cover, characterized in that it consists of a manhole cover
(1), manhole cover seat
(2), groove for installing anti-noise rubber strip
(3), anti-noise rubber strip
(4), connecting screw holes