BS EN124 608x628 mm Square DI manhole cover Class E600 loading weight 134000 lbs for low to moderate speeds driveways

TOPSUN have a knack for elevating even the most mundane things into a work of art. Case in point: the unique,   intricately designed manhole covers scattered all over China and the rest of the country. While most countries make do with generic geometrics when designing lids for their underground drainage systems, TOPSUN has turned the otherwise inconspicuous manhole cover into a form of public art fully deserving of your attention.

Japane style

 
  
China style

Our objective was to raise awareness for costly sewage projects and make them more palatable for taxpayers.
 

Specifications:

Product information:Manhole covers are manufactured for road construction, natural gas, water supply and drainage, telecommunications. Manhole covers and gratings should be smooth, no blisters, holes, distortion or any other defects. 

Size: 500mm*500mm,600mm*600mm,700mm*700mm,800mm*800mm, 850mm*850mmand so on.Many size can be choose,or according to customer's drawing or requirements.

Material

Ductile Iron GGG500,or according to customers requirement

Designs

EN124 A15, B125, C250, D400, E600 and F900 or As per customers' drawings or samples

Processes:

A) Moulding boards

B) Green sand with hand moulding

Coating

Cold applied black bitumen Or without Coating or as per customers' requirement

Inspection:

Third party inspection available upon request

Our Logistics department will offer:

Superior customer service
Better relationships
Enhanced efficiency

What Are They?

It's pretty obvious, but a manhole cover is essentially a removable plate forming the lid over the opening of a manhole. This prevents anyone or anything from falling in, as well as keeping unauthorised people out.

What Size Do I Need?

This is often a source of misunderstanding, but manhole covers are manufactured and listed by their 'clear opening size', which is essentially the size of the hole that the cover is to span, not the actual diameter of the manhole cover.

For example, a manhole cover listed as 600 x 450mm will more than likely have an overall measurement of nearer 650 x 550mm, but it will be designed to fit a hole size of 600 x 450mm, therefore it's size will be listed as 600 x 450mm.

It is important that the correct size is sourced, too small and the manhole cover will likely fail. Having the cover too big can be ok, unless the cover has reinforcing on its underside. However its best practice to source the correct sized cover.

Types Of Manhole Sealing

No seal  – The cover is usually just placed on top of its frame and that's that. It is normally heavy duty, cast iron or slide out covers that are unsealed.

Single seal  – Most manhole covers manufactured these days are single sealed. It is essentially a tongue and groove joint which is airtight when sealed. The cover surround is normally filled with grease which helps form the seal.

Double seal  – This is simply a double tongue and groove joint, which, as you would expect, forms a more comprehensive seal. Again this form of seal prevents air from escaping, providing the manhole is not under pressure. The double seal is often used when foul drainage manholes are situated within buildings.

FACE THE FACTS

As irritating as it may be, you will almost certainly need to replace not only the manhole cover, but also the frame in which it sits. Unless you are extremely lucky or your manhole was only installed very recently, you won't find a cover that fits in your old frame. Even if you do, it will not be a perfect fit, which means the strength of the whole unit will be compromised, possibly dangerously so. The correct course of action is to remove the old cover and frame completely, purchase a new cover and frame with the correct size and loading capacity, and install it properly. So the first thing to do is to track down the correct replacement.

HOW TO MEASURE THE SIZE

The one constant that all manhole cover manufacturers stick to is the method of measuring their covers.

All manhole covers and frames, regardless of the make, are measured by the clear opening size when the cover is removed – the distance measured across from the inside walls of the frame, from one side to the other. Take this measurement from the existing frame and write it down. Unless your manhole cover is fitted above a plastic inspection chamber, (which we will look at later), this is the only measurement you will need.

WHAT LOADING CAPACITY WILL YOU NEED?

If the manhole cover is in a garden or other pedestrian area, it only needs to be an A Class cover, rated to 2.5 tonnes. In a driveway we recommend B class, which is rated to 5 tonnes and will support a slow moving wheel load of 1.25 tonnes – perfect unless your everyday drive is a tank!

If you bring a van or small truck onto your drive we recommend a C class cover with a 10 Tonne load capacity. For commercial applications we suggest you refer to the more detailed loading specification table on our website.

Steel manhole coverPlastic manhole cover

STEEL, IRON OR PLASTIC?

Provided you stick to the guidelines above, the choice is yours. Historically most covers were made of iron, but with the technology available today the choice is much wider. Galvanised steel covers are lightweight and easy to install but can be rated up to 17 tonnes, so are extremely versatile and very popular. Iron and plastic covers and frames are black, so they may look better in a tarmac driveway, but really once you track down the right size and weight loading the choice is yours!

PLASTIC INSPECTION CHAMBERS

If your property is relatively modern, there is a fair chance your broken manhole cover may be sat on top of a plastic inspection chamber rather than a brick manhole. If this is the case you need to measure the diameter of the chamber, putting a tape measure across the inside – it will almost certainly be circular. Then all you need to do is purchase a cover and frame to suit that size of chamber (usually 450mm). It is worth double-checking before you buy that the cover and frame will fit all major manufacturers' inspection chambers, unless you are sure of the make of your chamber.

If your plastic inspection chamber is deeper than 1.2m, for safety purposes you need to fit a reducer to reduce the opening to 350mm to comply with building regulations. One other thing to note here, and it may sound obvious – you still need to make sure your cover has the correct loading capacity when fitted to a plastic chamber!

PATIOS AND BLOCK PAVING

Recessed manhole covers are now widely available, so there is no need to ruin a nice stone patio by installing a galvanised steel cover in the middle of it! Recessed covers and frames are simply metal trays that allow you to lay block paving, slabs or screed inside to match the surrounding areas. These too come in a variety of sizes and loads, so if you are block paving your driveway, replace your manhole cover at the same time -just make sure that your recessed cover has a suitable load capacity.

INSTALLATION

Installing a new manhole cover and frame is usually a relatively simple process provided you use the correct materials. It involves neatly removing the material (usually concrete or tarmac) around the old frame, levelling and bedding the new frame in, backfilling around it, and installing the cover.

 
Topsun service undertakes to provide you with long-term sustainable technical solutions, permanent innovation and expertise from our specialists.
A sustainable partnership based on trust, Topsun is present beside you.

A: Your inquiry related to our products or prices will be replied in 24 hours.
B: Protection of your sales area, ideas of design and all your private information.
C: Best quality and competitive price.