What are the manhole cover types?
How much does a manhole cover weigh?
Before knowing the reason why manhole covers are mostly in round shape, we need to know first the basic facts answering to this question, what is a manhole cover?
As commonly made out of concrete, cast iron, or a combination of concrete and iron, manhole covers are made for the safety of anybody passing above the hole of a sewer. At the same time, standard manhole cover size is being designed to fit in a person size as its second purpose is through it, technically trained individual can pass through it when maintenance is needed on the sewer or during the call of fixing on the underground pipes.
Through a metal base, manhole covers sits on it having a smaller inset rim fitting the cover. To secure it, manhole cover lock is provided to avoid removal of any unofficial reason.
With its common appearance, manhole cover and frame appears in round for the first reason of resisting the Earth's compression around it. Secondly, manufacturers will also find it easier to make when compared to square or rectangular shapes which would not require them lining up the covers with angles with full consideration that manhole covers are heavy to move from place to place.
However, the main purpose of manhole cover why it is preferable to make it in round shape is to prevent it from falling into the circular opening. All manholes, whether it's a sewer or not, it will be created with a lip around the rim of the hole, with a size small enough than the manhole cover dimensions. Unlike if it is in rectangular, square, or oval shape, even if the hole is smaller and the cover is a bit larger, once the manhole cover will be inserted into the hole diagonally then there is a possibility that it could fit in and fall. With the circular shape, inserting diagonally still won't work to fit it and slip into the hole which make it more safe.
As what have been mentioned earlier in terms of the uses of manhole covers, manufacturers, in addition, produces manhole cover accessories like lifting keys and yard gullies to offer you more easy work related to manhole covers.
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Among the common types of manhole covers you may know, there are list of various specific manhole covers available now in the market. These are:
cast iron manhole cover
manhole cover material
heavy duty manhole covers
round manhole cover
double sealed manhole cover
square manhole cover
metal manhole cover
ductile iron manhole cover
lightweight manhole covers
sewer manhole cover
manhole drain cover
circular manhole cover
rectangular manhole cover
driveway manhole cover
galvanised manhole cover
grp manhole cover
septic manhole cover
triangular manhole cover
stainless steel manhole cover
smc manhole cover
light duty manhole cover
concrete manhole cover
The creation of manhole cover starts from gathering its raw materials to be used. It could be made out of a an iron, concrete, or a combination of both, manhole cover design should carefully considers the standard dimensions and purpose.
All manhole covers are being made from large factories. If it is of cast iron, mainly it is made from foundries, a factory of iron castings.
After acquiring the pattern of the manhole cover, a mold will then be prepared. Once the mold is ready, molten iron or mixed concrete is then poured into it. Cooling will then takes place in an hour or more. But to completely settle and cool it down, it requires a day to be considered that it will be ready for transport to market.
Lifting manhole covers may require physical effort to do it. You will be prone to the risk of injury if you will undertake such work without using proper lifting aids.
Lifting keys will be used in pulling manhole covers to make it easier. Since it is your hand and back that will take the risk of doing it, proper way to do it should be known.
There are two way to lift a manhole cover:
1. Tradition lifting system
It will be done by raising the cover slightly in a vertical direction then withdrawing it at low level. Using rollers, it will be move to a space, not close yet not far from the whole.
2. Magnetic lifting system
This will work best for metallic covers as it will easily lift a manhole cover without requiring manual risk unlike in the traditional way.
As it has been mentioned, round manhole cover is very common to see and you may wonder why it appear that way. This is mainly for the reason that circular covers cannot surely slip into the hole even if it will be push diagonally, unlike manhole covers in rectangular, square, or oval which can slip into the hole if not placed on the right position.
In addition, circular manhole covers also offers the advantage of resisting on Earth's compression around it which plainly shows both the technical and practical reason why manhole covers should be design round.
Manhole covers weigh usually more than 113 kilograms or 249 lb, whether it is made out of concrete, cast iron, or a combination of both. Its standard weight is an advantage to keep it in place even if traffic will pass it while providing an ease of lifting for authorized personnel during maintenance work.
It has been made strong and heavy yet inexpensive. Manhole cover cost will really vary depending on size and material. The best way to know the is to request a quote from manufacturers and dealers selling good quality covers with available stocks according to what you are looking for.
If you are planning to buy manhole cover, you have to know the basic factor to consider before arriving for the worst or best option.
"Where can i buy a manhole cover?" is a very common question people would think ahead without thinking what to consider first facing the fact that you will just be confused with the array of choices available in the market if you are not well equipped with knowledge prior to buying.
First thing you have to consider is to know the size of the hole to where you are going to use the manhole cover. There are standard sizes of manhole covers together with its frame but the good thing is whenever you can't find the exact size available in the market to fit in the clear opening of the hole, there are manufacturers who offers custom manhole covers suiting to what you really need.
The next thing to consider is the loading capacity. You should be able to identify the location where the manhole cover setup will be placed in order to know what loads will it carry. Whether it will be a pedestrian area, a driveway, or for the purpose of commercial application.
After knowing the loading capacity then surely you can come up with what material suits best for your cover. There are lots of materials available for manhole covers but the most common are cast iron, concrete, or the combination of the two. Whether you will choose the typical composition or on the newly manufactured covers, just make sure that this is suitable and durable enough to serve the purpose of your hole requiring less maintenance.
Lastly, in the installation stage, once you had chosen the correct materials, size, and loading capacity, the process will just then be relatively simple. It will start simply on clearing the hole to be covered from any debris, either you are replacing or putting a new manhole cover. Then level and bed the frame of your cover to ensure safety. Backfill around it. Then install the cover.
To be economical in buying manhole covers does not mean suffering with the quality that you are choosing. Quality and durability should come together with the cost consideration. It is just a matter of choosing for the best manufacturer.
With us, we do not offer only the standard sizes and best material, but we also give importance on the durability, budget, and standards in the view of our consumers. This is the main reason why customized manhole covers are now available to cater the complete need of one consumer.
We believe that to satisfy one consumer can bring us more customers to buy our good quality, durable, and economical manhole covers.
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