Height and level of wooden keel: For example, some anticorrosive wooden floors need to be installed overhead. At this time, we should pay attention to the height and level of the wooden keel, which is generally between/10 mm-25 mm-25 mm. If the level of the wooden keel is not found well, it will easily lead to the deformation of the anticorrosive wood floor during use.
The specified value in the corrugated beam guardrail: the anti-blocking block used on the expressway is designed to be 4.5 mm, and the actual allowable deviation thickness should not be less than 4.35 mm. However, in some places (such as Shandong and Inner Mongolia), if the acceptance is strict, it must be not less than 4.5 mm thick.
The anti-blocking blocks used in expressway approach roads, first-class highways, second-class highways, provincial roads, county roads and village roads can be thinned accordingly, with 4.25MM, 4MM and 3MM.
Extended data:
When producing steel plates or steel pipes, the accuracy is limited due to the limitations of factory technology. It is impossible to roll a completely flush steel plate, and it is not completely in line with the nominal thickness. Therefore, the thickness of the produced steel plate or steel pipe is a range. In order to ensure the quality of steel products and facilitate the design of steel industrial products such as containers, the state has stipulated the allowable deviation of steel thickness through technical standards and specifications.
The allowable deviation of steel thickness is only the negative deviation of thickness in some steels, and some of them have both upper and lower deviations (for example, GB245 1 1-2009 Stainless Steel Plate and Steel Strip for Pressure Equipment stipulates the positive and negative deviations of stainless steel hot-rolled thick plates, hot-rolled steel plates and steel strips). Its value will be different in different standard systems, and will change with the update of standards in the same system.
Baidu Encyclopedia-Allowable deviation of thickness