Maintenance on your manhole cover is extremely important, even there is a small issue with your manhole now is the time to fix it, by replacing it. Even a small crack in the middle of the manhole can be extremely dangerous, especially in areas where there are pedestrians and small children stepping over it, as it has an increased risk of falling through. Either way, no matter the damage, a replacement manhole cover is required.
Firstly, you need to take an accurate measurement of the manhole cover you currently have installed. To do so, you need to get a clear measurement, this is the width, height and depth of the hole in the ground. To get yourself a clear measurement of the opening, take your tape measure and measure the inside of the inspection chamber from wall to wall. It is suggested that every manhole is measures this way and this will allow you to find the exact replacement.
If your manhole cover does have an inspection chamber underneath then it is imperative that you measure the diameter of the circular chamber, so that you can ensure your manhole cover matches. We would also suggest that when purchasing the replacement manhole, you check to see whether the cover and frame selected is compatible with all the main inspection chambers brands.
Secondly, you need to pick your load class. Every manhole is designed to sit within a specific load class, which allows you to understand the maximum weight the manhole can safely take. E.g., if a manhole cover is to be installed in a shopping center car park, then you can safely say that you would need a manhole cover that can withstand a C250 loading. This to ensure that the manhole continues to perform correctly when cars are moving over it.
Below shows a break down of the different load classes suitable for manholes.
Choosing your materials, here at PolyDrainage we specialise in Ductile Iron and Composite. Choosing the material is totally up to you, However, below shows the benefits of each material.
Ductile Iron Benefits:
For any more information surrounding changing and maintaining your manhole cover, please do not hesitate to get in touch with us at firstname.lastname@example.org