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QuestionWhy are manhole covers finished of cast iron as same are through of ductile iron? AnswerUsually, manholes covers are made of cast iron. Though, in viewpoint of pipe preservation, frequent opening of manhole covers have to be approved out. Consequently, it poses potential safety hazard to workers through lifting-up procedure of manhole covers since cast iron manhole covers are incredibly heavy to regular workers. As a result, research has been conducted and ductile iron is measured as a better choice than cast iron as it be able to oppose same traffic loads with lesser self-weight. Furthermore, as ductile iron is less brittle than cast iron, usual cast iron manhole covers are additional susceptible to harm and thus need higher preservation cost. Though, ductile iron manhole covers do endure from some demerits. For case, owing to their relative small self-weight, vehicles transient over these manhole covers would lead to movement of covers and generate unpleasant noises. To solve this problem, in its place of increasing self-weight of elastic iron manhole covers which similarly causes safety trouble to workers throughout regular upholding, covers can be designed to be attached to the manhole frames which hold them in firm position.
#How to find the sieve analysis of 20mm aggregate?
a) Explain Terzaghi's theory of bearing capacity of shallow strip foundations. Determine the three bearing capacity factors and give their values for Φ = 0' case. (b) Descreib
Problems on Roof truss
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A rectangular concrete beam is subjected to a factored moment (Mu) of 345 kip*ft. The beam has the following properties: f'c = 5500 psi fy = 60,000 psi h = 39 in
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Define in biref about the Final Prestress The stress which exists after all losses of prestress have occurred substantially is known as final prestress. This may be calculated
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Question What is the reason that vibrators not used in concrete compaction in piling works ? Answer Concrete for piles must be a high-slump self-compacting mix that i
Nonsymmetrical loading of the snow A decrease in snow weight in some parts of a roof because of the wind, or melting from the heath, or the sun light would reduce internal powe
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