Inspection wells are provided for servicing underground communications at the network nodal points. To exclude the ingress of foreign objects into them, to ensure safe movement for pedestrians and vehicles, the wells are covered with hatches from above.
What is a sunroof?
There is an opinion that this is a flat movable structure, which is placed on top of the well. In reality, it is only a manhole cover. In addition to it, there is a fixed part - a shell, which is fixed on the upper part of the well.
The cover has a grooved surface, which provides good grip, allows you to move on it without slipping. The lid is made in a flat or convex shape to avoid stagnation of liquid inside, which can freeze in winter.
Materials
Due to the special operating conditions, the following requirements are imposed on the materials:
- High mechanical strength, which allows the hatch to withstand the weight of the vehicle and dynamic loads on the roadway.
- Resistance to precipitation, temperature drops, frost.
Based on the required performance characteristics, the following materials are used for the manufacture of sewer hatches.
Cast iron
It has been used for a very long time. If you decide buy hatches made of cast iron, you can appreciate their advantages:
- The structures have high strength - they can withstand up to 40 tons of load.
- They work perfectly at any time of the year, withstand temperature differences during operation on heating mains.
- The heavy weight makes it difficult to carry out maintenance work, but at the same time prevents theft.
Among the shortcomings, it can be noted that it is difficult to lift such products without special devices - they reach up to 50 kg of weight and more.
Polymers
They have less weight and cost, beautiful appearance, which is important when used in well-groomed areas. It is undesirable to use it on roads where the passage of heavy freight transport is organized. In connection with the possible heating in the summer from the sun's rays, when buying, you should inquire about resistance to weathering.
Reinforced concrete
They have relatively low strength characteristics. From the action of heavy loads, they can collapse. But they are cheap, it is possible to make them at home. Therefore, until now they are used for covering wells. Unfortunately, the use of metal fittings inside the product attracts lovers of easy money.
Construction form
They can be round and square in shape. Most often pr
