The rings of the hatch of the cover

## Rings of Lukes: covers hiding the dungeon of the city
Luke rings are inconspicuous, but extremely important elements of urban infrastructure. These round lids, usually from cast iron or steel, hide a whole world of communications under them: water pipes and sewage pipes, communication cables, metro tunnels and much more. They provide safe access to these systems for repair work and maintenance, and also prevent an accidental drop in people and animals into underground structures. It seems that these are just ordinary covers, but the whole history of the city is hidden in them.
### variety of forms and materials
Although we are used to seeing standard round rings of hatches, in fact, their variety is much more. The size and weight of the lids depend on the fact that they cover: small hatches can hide cable lines, and huge manner - deep collectors. The material can also vary: in addition to traditional cast iron, steel, composite materials, even plastic in some cases are used. The old cast -iron hatch with a worn by the inscription itself becomes part of the city landscape, a kind of artifact that carries a mark of time.
### Security and Durability - the main criteria
Very high requirements are imposed on the rings of hatches. They must withstand enormous loads - the weight of passing transport, temperature changes, the effects of aggressive media. Therefore, special attention is paid to the strength and durability of materials. In addition, safety is also important: the lid must be securely fixed to prevent its displacement or random opening. Modern technologies make it possible to create hatches of hatches that meet the most stringent standards, ensuring the safe and uninterrupted operation of underground communities.
### Invisible Heroes of City Life
Despite their invisibility, hatches of hatches play an indispensable role in the functioning of the city. They are invisible heroes who provide the comfortable and safe life of its inhabitants. The next time you see Luke on the street, think about how many important communications are hiding under it, and evaluate the importance of these inconspicuous, but essential elements of the urban economy.