The use of nodular cast iron manhole cover needs support. When choosing the model with coverage type, attention should be paid to the correct installation. During the installation process, the installation firmness is very important. It directly determines that the subsequent manhole cover can be used normally. Here is the introduction to your requirements.
1. 井座表面支承压力应小于7.5n /mm2。
1. The bearing pressure on the well seat surface shall be less than 7.5n/mm2.
2. Foundation height: the foundation height of D400, E600 and f900 shall not be less than 100mm.
3. Ductile iron manhole covers shall be manufactured to ensure compatibility with the well seat. For D400, E600 and f900 derricks shall be manufactured to ensure quiet and stable use. Manhole covers shall be noise proof by machining these contact surfaces, noise proof rubber washers or three point contact design.
4. The net hole opening design of the ductile iron manhole cover shall effectively meet the relevant safety and functional requirements. Generally, the net hole diameter of the manhole seat shall not be less than 600mm.
Through the above introduction, we can learn that it has played a great role in the selection of nodular cast iron manhole cover holes. Pay attention to the strength of the selected products, but they also match each other, so the cover or wrong installation after installation to ensure safe use will bring potential safety hazards.
The above is a detailed introduction to the requirements of Shandong ductile iron well cover for well seat。 For more information, please click http://www。jnwszy。com