They are located at the top of the structure

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Bottom slabs. Monolithic reinforced concrete slabs that serve as the bottom and perform the function of waterproofing wells;
Support rings. These are additional elements that are intended for non-standard height structures for road construction. They are identical in size to standard rings, but have a significantly smaller height;

Support slabs. They have a rectangular shape with a round or shareholder data outlet in the middle, which is subsequently closed with a round iron hatch or a rectangular grate for waste water. The rectangularity of the support slab helps protect the well itself from destruction. Due to this shape, the load is directed evenly over the entire perimeter of the slab, and the walls of the well receive a minimal load, which helps maintain the long-term functionality of the structure itself;

Rings with covers. and ensure safe operation of the wells. An opening in the cover, on which a cast iron hatch is installed, is necessary to ensure free access inside the well;
Sewer manholes are unified cylindrical concrete structures that are designed to create underground sewerage, gas and water supply systems. Inside the sewer manhole there is a metal mesh with a thickness of 0.6 - 1 mm;

Cast iron hatches. They close the wells and prevent large foreign objects from getting into the system, and also protect against accidents.
When choosing reinforced concrete wells, it is necessary to take into account the characteristics of the structure being erected. For example, concrete rings for wells located on highways are always equipped with floor slabs and hatches, and if it is necessary to ensure the water resistance of the structure, concrete rings with a bottom are used.

Precast reinforced concrete manholes are manufactured in accordance with the requirements of GOST 8020-90 and series 3.900.1-14. "Reinforced concrete products for round water supply and sewerage manholes", issue 1 "Instructions for use and working drawings" from heavy concrete with a compressive strength class of B15. Well support plates are made of heavy concrete B20. The frost resistance grade of concrete for working chambers of manholes is adopted to be no less than F75, for other products - no less than F100. The water resistance grade must be no lower than W6.