What are the specifications of composite manhole covers? Under normal circumstances, 600MM, 700MM, and 800MM are relatively common, and many of them are used. But the most commonly used is the 600MM type. But there are also some around 550MM, and the usage rate is relatively high. But no matter what the size standard is, the selection requirements are based on the load-bearing and the environment of use, so not any one is arbitrarily selected when using the manhole cover. In my country, there are many national standards for manhole covers, including double-layer, single-layer, cast iron, nodular cast iron, composite, cement, magnesite, etc. The diameters of manhole covers are: 600mm, 700mm, 800mm, 750*450mm, 600*600mm, 400*600mm, bearing capacity: heavy 240KN, ordinary 100KN, light 20KN, extra heavy 8000KN, etc. The existing 8 standards are: EN 124 "Drain cover and inspection of driveway and walkway Manhole Covers", CJ/T 3012-93 "Cast Iron Inspection Manhole Covers", CJ/T 121-2000 "Recycled Resin Composite Inspection Manhole Covers", JC 889-2001 "Steel Fiber Concrete Inspection Manhole Covers", CJ/T 211-2005 "Polymer Material-based composite material inspection well cover", CJ/T 130-2001 "Recycled resin composite water grate", JC 948-2005 "Steel fiber concrete water grate cover", CJ/T 212-2005 "Polymer-based composite water grate ". Among them, the European standard EN124 is internationally accepted. It was approved by CEN (Drainage Technical Committee) on June 6, 1994. It is applicable to manhole covers of various materials. It stipulates that this standard is an undisputed international standard under any circumstances. . Countries outside Europe also implement this standard, which shows the advanced nature and authority of this standard.
Medium-sized and heavy-duty composite manhole covers refer to the quality grade of the manhole cover, specifically referring to the bearing capacity of the manhole cover; the specification and size of the manhole cover refers to the physical shape of the manhole cover, which can be divided into square manhole cover and circular manhole cover.
Standard size of round composite manhole cover:
Circular composite manhole covers are generally 600MM, 700MM, and 800MM are relatively common, and many of them are used. But the most commonly used is the 600MM type. But there are also some around 550MM, and the usage rate is relatively high. Generally speaking, the 600 manhole cover means that the diameter of the cover is 600, so the part of the lower population, that is, the effective diameter must be smaller than 600, and generally it will be around 550. The big ones are 700 and 800.
Circular heavy-duty composite manhole cover test load: extra-heavy 8000KN, heavy-duty 400KN, common-type 250KN, light-duty 125KN
Standard size of square composite manhole cover:
Heavy 400KN, ordinary 250KN, light 125KN, square manhole covers 500*500 B125 500*500 B125 600*600 B125 C250 700*700 B125 450*750 B125 C250 700*800 B125 and other different user needs are different. The product standards of the ears are different and can be customized according to the needs of customers.
Composite manhole cover flexural strength: average 22MPa Impact strength: average 10J/m2
Composite manhole cover compression strength: average 25MPa
Composite manhole cover tensile strength: average 10MPa
Composite manhole cover elastic modulus: average 1000MPa
The interior of the heavy-duty composite manhole cover is reinforced with reticular steel bars, and the key stress-bearing parts are especially strengthened. When an inevitable external impact occurs, the pressure can be quickly released to ensure the safety of people and vehicles.
Specific reference standards for manhole covers:
The existing 8 standards are:
EN 124 "Drain covers and manhole covers for driveways and walkways",
CJ/T 3012-93 "Cast Iron Inspection Manhole Cover",
CJ/T 121-2000 "Recycled Resin Composite Inspection Manhole Cover",
JC 889-2001 "Steel Fiber Concrete Inspection Manhole Cover",
CJ/T 211-2005 "Polymer Matrix Composite Inspection Manhole Cover",
CJ/T 130-2001 "Recycled resin composite water grate",
JC 948-2005 "Steel Fiber Concrete Water Grate Cover",
CJ/T 212-2005 "Polymer matrix composite water grate".
Among them, the European standard EN124 is internationally accepted. It was approved by CEN (Drainage Technical Committee) on June 6, 1994. It is applicable to manhole covers of various materials. It stipulates that this standard is an undisputed international standard under any circumstances. . Countries outside Europe also implement this standard, which shows the advanced nature and authority of this standard.
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