While the pertinent European Standard EN 124 (in Germany mostly applied in conjunction with DIN 1229) serves as a widely used standard parameter for the design, manufacture and load test of access covers, the advantage of using the cited Standards is also closely tied to practical aspects, such as material, production quantity – and also cost!
EN 124 stipulates a test load classification for access covers, ranging from A15 (light) to F900 (ultra-heavy), to be proven by practical load test of the ready products. This kind of load test, however, is meaningful and economical only for articles of mass production, such as cast iron covers. EN 124 has emerged from Standards used for quality control of such products. For computation of load acceptance for cast iron covers there was no recognized static formula in existence, which made it necessary to establish their real capacity for load acceptance by practical load test. For individually manufactured (fabricated) covers of steel, stainless steel and steel-concrete, however, such load tests would be onerous and highly uneconomical, as for each type and size of cover several pieces would have to be manufactured – even if only a single cover were needed.
Since nowadays there are recognized static calculation methods in existence for materials like steel, stainless steel and steel-concrete, we compute access covers of these materials in relation to their intended area of application and to the expected traffic load in that area, in conformity with DIN 1072 (“Load Acceptance for Roads and Road Bridges”) DIN specialist report 101, (“Load Effect to Bridges”) or as per DIN 1055-3 (“Load Effect to load-bearing Structures”) and mark our covers accordingly for the acceptable load charge.
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