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Ductile iron manhole covers, where applicable

编辑:四川井盖厂家 时间:2019-11-01 Source: Unknown Editor: Sichuan Manhole Cover Manufacturer Time: 2019-11-01
Although there are many types of manhole covers on the market, cast iron manhole covers, to be precise, ductile iron manhole covers are still the mainstream products in the market. This is determined by the material. In the next few years, nodular cast iron manhole covers will still be on the market. Mainstream products.
Because of the mainstream products, it has a wide range of applications:
Around us you can find: water supply manholes, municipal manhole covers, sewage wells, telecommunication manhole covers, China Unicom, mobile manhole covers, thermal manhole covers, street light manhole covers, fire protection, valves and even rainwater rafters for drainage are made of ductile iron. This material is made of ductile cast iron QT500-7, which makes the product have strong compressive resistance, bending resistance, impact resistance, heat resistance, cold resistance, wear resistance, acid and alkali resistance, aging resistance, and non-deformable characteristics. The bearing capacity of heavy manhole covers is only 24 t, which is definitely not enough; the "fracture load" of the A-type manhole cover of "Steel Fiber Reinforced Concrete Manhole Cover" is only 18 t, and the index is seriously low.
Although there are 3 standards in China, all of them have certain limitations, and they cannot cover existing manhole covers of various materials.
The bearing capacity of the manhole cover is a key indicator for measuring whether the manhole cover can be used on the road. If the bearing capacity is not high and it is crushed during use, it is no different from the theft of a cast iron manhole cover.
Therefore, no matter what kind of material is used as the manhole cover, when used on the road, it must reach a test load of at least 36 t as specified in the "cast iron manhole cover" standard.
With the development of the city, the roads are getting wider and wider, the traffic volume is getting larger and larger, the load capacity is getting higher and higher, and the bearing capacity requirements of the manhole covers are getting higher and higher.
Therefore, manhole covers of new materials must not only meet the existing "cast iron manhole cover" standards, but also exceed this standard. If a new manhole cover standard is to be developed, the proposed carrying capacity classification and regulations should refer to the European standard EN124, and the manhole cover used on the motorway should have a bearing capacity of not less than 40 t.
Ductile iron manhole covers The latest nodular cast iron manhole covers have been developed based on the needs of the application, and have developed anti-settling, anti-sinking, anti-skid and anti-skid functions. Can be customized according to user requirements:
1. Drainage works, applied to rainwater and sewage pipelines.
2. Water supply engineering, applied to tap water, fire protection engineering, etc.
3. Heating engineering, applied to heating arm line.
4. Power supply engineering, applied to power supply cables, telecommunications engineering, telephone, communication cable pipelines.
5. Garden engineering, applied to supporting integrated pipelines.
6. Gas engineering, applied to gas engineering, natural gas pipelines, etc.
7. Street light engineering, applied to power supply, lighting, cable pipeline