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Q1) I am having an interview in a construction company for
a large sewage project . Since I have not done any such
project , there are some queries from my end. Pls. help me
to solve them. I will be thankful to you :-
a) Normally for large project 400-600 houses & around
1600 peoples , how much dia pipe is used and which type of
pipe is used?
b) For trenching , I have heard that IS 1200 implies,
what are the rules of calculating earthwork in case of
depth of 2m or above ?
c) To prevent soil to fall when depth of trench is
more , what steps are taken and how there qty. is
calculated . Like I have heard about timbering . what is
this ?
d) What are the rules for disposing off the excavated
soil ?
e) How the pipes that are used are being jointed?
f) In case of cleaning on choks , is there any
intermediate things provided?
g) For foul gases any outlets are provided thru out
length of pipeline?
h) What is the flow digram like from houses thru small
pipe to main pipeline than where main pipeline disposes
wastage ?
i) Any other thing that has to be kept in mind while
calculating earth work for excavation like steps are made
and other things? How earthwork is calculated in case of
steps ? Pls. explain with a sketch.
Regards,
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Answer Posted / sjtbehera
Ans1. +generally raw water from house to treatment plant CI
pipe are used. is maximum 600 Dia. in plant maximum 200 dia
re used. HDPE pipe are used.
ans - calculating earthwork is based on site condition.
although some rules are provided in IS 1200, but it is
better to calculate in site. below 2mm avg. calculation are
done
ans-for falling of earth scour are applied. this means some
protection done for sliding soil to the trench. it is aform
of net, tina fixing or sand bags are provided.
Ans- disposal of earth from site not follow some basic
rule. Calculate filling earth. volume of this earth are
store in suitable site. rest you disposal according site
incharge.
ans- pipes are joint in collar joints or welding
ans- choks are omitted by manual or by pressure
ans- no vent pipre are not provided in pipe. sweage dirctly
transfer to treatment plant. air ventilation pipe are
provided for air pressure.
ans- sorry this page are not allow to draw sketch
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