Author:Site Editor Publish Time: 2020-11-18 Origin:Site
Before installing the manhole cover, you must know how to choose a suitable manhole cover. There is a guide to choose manhole covers.
The common wrong way to measure the manhole cover is to directly measure the size of the manhole cover. Actually, the inner diameter of the frame should be measured. If the measurement is wrong, it may cause installation failure and increase the difficulty of installation. People usually think that the size indicated on the manhole cover is the outer diameter of the manhole cover. In fact, this size is to adapt to the diameter of the manhole. Because the manhole cover is to adapt to the manhole, not the manhole that only has the manhole cover. So you should know your manhole data to buy the right manhole cover.
For example, if you buy a 600mm manhole cover, you actually measure it, and its diameter is slightly larger than 600mm. This ensures that the manhole cover will not fall into the manhole. Ensure the firmness of the manhole cover after installation.
If it is a square manhole cover, you need to measure the inner wall of the manhole from side to side, measure the length of the two sides, and measure the height at the same time. Measure the inner diameter of the manhole in a circular shape. The measurement data should be in millimeters to ensure the accuracy of the data.
When purchasing a infill drain cover, make sure that the net opening size of the manhole cover you buy is at least equal to the size of the manhole. If the covering layer is too small, the manhole cover may fail and fall into the manhole.
The correct size for frame seating. Length and width shall bigger than frame size; Depth of seating shall be 40mm more than the height of the frame. Make sure frame opening size equal to or bigger than the existing hole.
Then the important point is where is your manhole cover installed?
BS EN124-5 A15 Class and is suitable for areas which can only be used by pedestrians and pedal cyclists.
BS EN124-5 B125 Class and is suitable for use in car parks and pedestrian areas.
BS EN124-5 C250 Class and is suitable for installing in the area of side channels or road.
BS EN124-5 D400 Class and is suitable for Carriageways of roads, hard shoulders, and parking areas, for all types of vehicles.
It is the British adoption of the European standard for covers and gratings that separates products into a number of classes based on a static load test, and also groups the locations where each class should be installed. You can select the manhole cover within the required load-bearing range based on this standard.
Common materials for manhole covers are cast iron, steel or aluminum alloys, and composite materials. We recommend using composite manhole covers.
Taking advantage of the natural advantages of SMC materials and continuous improvement of production technology, Jinmeng composite manhole covers have good impact resistance, bending strength, high friction resistance, noise resistance, high corrosion resistance, good damage safety, longer service life, weight suitability, and convenient installation, natural anti-theft because it has no recycling value; at the same time, it uses the anti-theft lock system independently developed by Jinmeng to achieve double security protection and make the road safer.
Generally, manhole cover are equipped with a man-up key. You only need to insert them into the pick holes of the manhole cover, hook the manhole cover, and then lift it. Pay attention to handling heavy manhole covers. Two people should work together to ensure safety. There are more hydraulic lifts suitable for heavy manhole covers to help you open manhole covers. If the manhole cover is damaged, please pay attention to the lifting point to avoid splitting during lifting.
If you often cannot find your man-up key or find that it is always not at hand when you need it. You can choose a flip-type manhole cover, whether it is a rope or a curved iron hook, it can be hooked up. Then you can easily open the manhole cover.
If your manhole cover is not a clamshell, try to use a screwdriver or other tools to lift the edge of it. It will be difficult to lift. If there is a straight or curved steel bar, you can insert it into the hole of the manhole cover. Using the principle of leverage, first, tilt it up to a certain angle and hold it with your hand to open the manhole cover. If your steel bar is short and difficult to handle, you can tie a rope to the middle of the steel bar, insert the steel bar through the hole, and then pull the rope to hang it up.