Manhole covers finished of cast iron same as ductile iron, Civil Engineering

Assignment Help:

Question
Why are manhole covers finished of cast iron as same are through of ductile iron?

Answer
Usually, 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.


Related Discussions:- Manhole covers finished of cast iron same as ductile iron

Cross sectional area to be excavate for roadway construction, The Table pro...

The Table provides the cross-sectional areas to be excavated for the roadway construction. The volume of earth to be excavated (yd 3 ) between section 83+65.6 and 85+98.5 is most n

What will be the increase in horizontal thrust, A 9 metre high retaining wa...

A 9 metre high retaining wall retains a soil with the following properties: φ = 36°; γ = 18 kN/m 3 . What will be the enhance in horizontal thrust if the soil slopes up from the

#title.long span truss design, what are the step by step process of designi...

what are the step by step process of designing steel long span trusses?

What is the role of sunfilter in building, QUESTION (a) Using an illu...

QUESTION (a) Using an illustration, describe what happens to sunrays when it passes through the atmosphere to reach the ground. (b) What is the role of a sunscreen/sunfil

Pavement drainage, Pavement Drainage: Water enters the pavement layer...

Pavement Drainage: Water enters the pavement layers through cracks, joints and open spaces in the pavement surface. The water reaches the soil sub-grade on which the pavement

Disparities between regular precast and pipe jacking, Question What are...

Question What are main disparities in design between regular precast concrete pipes and pipes used for pipe jacking ? Answer For pipes used for pipe jacking, they h

Wires in gabion walls, Gabions are wire mesh boxes that are filled with sto...

Gabions are wire mesh boxes that are filled with stones and they areplaced in an orderly pattern to act as a single gravity retaining wall. Meshes or Lacing wires are designed t

Draw the variation in total stress, Draw the variation in total stress, eff...

Draw the variation in total stress, effective stress, and pour water pres- sure up to a depth of 6 m below ground level, given the following data. The water table is 2 m below grou

Mini projects, is there any innovative projects in disaster management ?

is there any innovative projects in disaster management ?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd