Author:Site Editor Publish Time: 2020-12-15 Origin:Site
The weight of the cast iron manhole cover is generally determined by the size and thickness of the manhole cover. According to the standard of BS EN 124-2, the light cast iron with a diameter of 500mm is only allowed to be used by pedestrians and cyclists (at least A15). The total weight of the manhole cover and base is generally not less than 50kg, and the cast iron manhole cover is generally about 25kg. As the manhole cover increases and the load-bearing grade increases, the weight of the manhole cover also increases.
The composite manhole cover is 20%-30% lighter than an iron manhole cover, such as one clear opening 600mm D400 iron manhole cover is 56kg, but one clear opening 600mm D400 composite manhole cover is 48kg. Lighter weight means saving not only the shipping cost but also the labor cost.
As the size of the manhole cover increases in diameter, its area increases by a geometric multiple, so its weight also increases by a geometric multiple. The 600mm manhole cover is 1.44 times the area of the 500mm manhole cover, so it may be that the larger manhole cover may be heavier than you think. Therefore, the cast iron manhole cover on the driveway can reach several hundred kilograms, and it is very difficult for a person to open it alone. It is even more impossible without tools. Also because of the metal properties and high weight, cast iron manhole covers have become the target of thieves.
The most important thing in the choice of a manhole cover is the choice of size. If it is to replace the manhole cover, the data that must be measured is the required size of the manhole diameter. Instead of the old manhole cover size. It needs to be confirmed when purchasing. We offer a bespoke fabrication service whereby your cover is manufactured exactly to the dimensions required!
The advantage of a heavy manhole cover is that it is very heavy and suitable for high-pressure roads. For example, airports, highways, etc. Cast iron manhole covers are often used with load-bearing types above D400, so cast iron manhole covers above this level are very heavy. The car passes very stably and will not bounce due to rapid impact pressure. However, due to the metal material, the vibration and collision of the manhole cover and the base when the car passes by will make a noisy sound.
Although composite manhole covers are lighter, they can be made more precise than cast iron manhole covers. There can be a tight fit between the manhole cover and the base, and there is no gap at all. In this way, the car will not bounce due to the impact force and will not make a loud collision.
The heavy manhole cover is not easy to be opened always, but Jingmeng's heavy manhole cover is equipped with lifting screws and also the lifting key, it becomes easy to be lifted. Only one person can operate the heavy manhole cover.
Greenbelts, sidewalks, etc. generally use light manhole covers, the color can be green and gray. The color of the manhole cover is determined by the material factor. The common cast iron manhole cover is its original color. It will rust after a long time. The surface of the cement well is generally gray from the cement itself, but the surface is sprayed according to customer requirements. However, the cement manhole cover is heavy and easy to crack, but the cost is low. At the entrances of stations, airports, hotels, etc., there are asphalt pavements, and black manhole covers are generally used, which is beautiful and not obtrusive. The composite manhole cover can provide various colors, suitable for various scenes. Its color is not sprayed on the surface, but according to the customer's requirements, the raw materials are adjusted to the customer's color before production and then pressed out by the press.
How to open a manhole cover? The heavy cast iron manhole cover can only be opened with the help of large machinery and tools, such as some tradition lifting systems and magnetic lifting systems. It not only covers a large area, but also cumbersome operation. Based on the advantages of lightweight, the composite manhole cover completely saves the cost of moving and opening the manhole cover. It can be opened with a simple tool. The operation is simple and the tools are easy to carry. And Based on JINMENG R&D, jinmeng has manufactured special lifting equipment to open the manhole cover, only JINMENG equipment can open, others cannot.
How to safely remove manhole cover? There are lifting screws on the jinmeng manhole cover surface, so the manhole cover can be lifted by some special hooks. And the manhole cover has a multi-hole design, which can be assisted by several people at the same time. Before removing the manhole cover, prevent the safety cone,
Make sure the tool you are using is right for this manhole cover, do not use the hand to lift the manhole cover. And a composite floating manhole cover is installed inside the manhole cover to prevent pedestrians from falling into the well. The double cover design is very useful. When the main cover is damaged, the auxiliary cover can also be used as a temporary buffer to prevent the risk of falling.