Selecting the right frame for a sewer manhole cover is a key step that affects not only the functionality of the entire solution, but also its durability, installation method, and resistance to traffic load. When making a decision, several factors must be considered – such as the type of roadway, the structure of the shaft, or installation requirements.
This article therefore provides a basic overview of the most common types of frames, their properties, and suitable applications. This will help you better navigate the available options and more easily choose a solution that matches specific conditions.
Concrete–cast iron or smooth cast iron frame
This is the most commonly used type of frame, offering a balanced combination of price, easy installation, and reliable performance. Thanks to its large bearing surface, the frame is rigid and strong, allowing multiple correct installation options on the shaft.
Smooth frames designed for hinged covers have a height of 100 mm, while other types reach a height of 160 mm. For Standard series covers, it is also possible to choose different internal wall heights and even opt for a version with a square base.
This type of frame is suitable for roads with heavy traffic loads. Another advantage is the reduced amount of material required for installation.
Cast Iron Footed Frame
The cast iron footed frame is a lighter construction, suitable mainly for shafts with low construction height or areas with lower traffic loads. Its low weight makes handling during installation easier.
The frame is typically manufactured with a height of 100 mm and offers only one installation method. However, during installation, it is necessary to account for higher material consumption to ensure proper embedding of the cover.
Self-Leveling Frame
The self-leveling frame represents the most advanced solution in terms of quality. It is not rigidly connected to the shaft, which allows it to effectively distribute loads not only into the frame but also beyond the shaft itself. Most importantly, it can adapt its position to the road surface level, increasing both driving comfort and the overall lifespan of the structure.
A height in the range of 130–150 mm is recommended for this type of frame. Self-leveling frames are an ideal choice for extremely heavily loaded roads.
For this frame, proper function depends on flawless installation, so we strongly recommend considering the use of companies specializing in manhole cover replacement and installation.
Concrete–Cast Iron Load-Distributing Frame
This type of frame is robust, heavy, and highly stable. It is designed to distribute loads not only onto the shaft but also into its surroundings, while simultaneously supporting the upper layers of the roadway.
Due to its weight, installation requires the use of machinery. These frames are manufactured in two basic sizes: diameter 1000 mm with a height of 180 mm, and diameter 1200 mm with a height of 200 mm.
Thanks to its properties, this frame is suitable not only for extreme traffic loads but also for the reconstruction and repair of damaged shafts.
Need Advice?
If you are unsure about choosing the right solution, feel free to contact us – we will be happy to help you find the optimal option for your specific conditions.