THIS IS THE PRESENTATION ON THE INTERNSHIP WORK CARRIED OUT BY ME FOR A PERIOD OF 1 MONTH AT VRISHABHAVATI VALLEY, MYSORE ROAD; UNDER THE GUIDANCE OF SUEZ INDIA Pvt.Ltd

1. Presented by,
R. Mahima Sharada 1VI15CV020
Vemana IT

2. Contents
• Introduction
• Safety engineering
• Soil condition and tests conducted
• Materials used for construction
• Staging or Formwork materials
• Surveying
• Ready mix concrete plant
• Rebar and Splicing
• Bar Bending Schedule (BBS)
• Laboratory tests
• Checking’s
• Steps marking
• Treatment process.

3. Introduction
• Sewage treatment is the process of treating and removing contaminants from waste water and household sewage,
both runoff (effluents) and domestic. It includes physical, chemical and biological processes to remove all the
physical .chemical and biological contaminants
• The internship mainly provided the opportunity to gain the field experience. I had got the opportunity to visit the
V-valley 150MLD treatment plant construction for 1 month located in Mysore road, Nayandahalli which is being
constructed and managed by SUEZ INDIA for a duration of about 5 years. The total area of the treatment plant is
nearly 81acres(including old and new plant area).
• The sewage treatment plant main process is Activated Sludge process with true Biological nutrients removal (low
N and P levels).

4. Safety Engineering
• Safety engineering is an engineering discipline which assures that engineered systems provide
acceptable levels of safety.
• This includes injury and illness prevention and loss control systems for customer service and technical
consultation to achieve Integrated Safety Management.
• The mission of Environmental Health and Safety (EHS) is to promote healthy and safe operations to
ensure protection of the environment and the workers.
• Safety measures taken in the site are:
a) Sign boards have been put up with slogans and precautions.
b) Barricades are provided along required areas.
c) Each and every engineer and workman is provided with safety helmets, reflecting jackets and shoes.
Safety and precaution based talks are given every day to workmen.

6. Soil condition and tests conducted
• Soil investigation, also called geotechnical investigation, represents a method of
determining physical properties of soil at a construction site. This procedure is done
with the aim of establishing whether soil is safe and solid for construction.
• The site of V valley mainly consists of filled up soil and not firm soil so the
geotechnical properties of the soil is improved and stabilized by the method of
“Soiling”.
• Soiling by adding boulders ,M-sand and by compacting which increases the density of
soil and reduces pores.
• 24 boreholes were drilled and carried out by employing rotary core drilling techniques
supported by mud pump. The boreholes are drilled up to 4.5m to 20m from existing
ground level (GL).

7. Materials used
The materials used for the construction of STP plant are Cement of 4 companies i.e
a. Ultratech cement.43 grade
b. Dalmia cement 43 grade
c. Penna cement 43 grade
d. Ramco cement 43 grade
M Sand which is procured from Bidadi and coarse aggregates of 12.5mm graded and 20mm single size.
Corrosion Resistant Steel(CRS) bars of different diameter (8mm, 10mm, 16mm, 20mm, 25mm) and cover blocks
are used, which are manufactured in the site that is 60mm,25mm. 60mm cover blocks is mainly used in the water
retaining structures and 25mm cover blocks is used in Non- water retaining structures.
Cellotex sheets of 25mm diameter are used vertically and horizontally called as water bars and kick bars with
projections on the surface of bars which make the structure to undergo less damage when natural disaster affects it
where the one part of the structure can be displaced and repaired and and the other side unit will be safe

9. Formwork & Staging Materials
• All arrangement done to support the green concrete till it attains the strength is known as
form work or temporary work.
• That portion which support shuttering is called Staging. This can be done through Wooden
Ballies, Pipes, Props, Jacks, bracings, chairs.
• Formwork sheets of size 2.4m*1.2m was used.
• Staging elements like Bracings, Prop Jacks ,Chairs below foundation mat and above, Jalli’s
had been provided for the support.
• Ties rods along with holder was also provided to hold the formwork while concreting.

10. Surveying
• A branch of civil engineering that is concerned with determining the area of any portion of the earth's surface,
the lengths and directions of the bounding lines.
• The Vrishabhavati river HFL is 803.3m(water line). The Invert level(IL) of incoming sewer to terminal man
hole is 806.5m. Design in the site is carried and based on High Flood Level(HFL).
• The temporary bench mark is carried from Cubbon park engraved on plinth of Victoria statue.
• The 2 main equipments used in the field are Auto level and Total station (Geomax & Trimble).
• Topo was measured to carry out the survey for excavation by entering the co-ordinates to the equipment and
by considering RL’s ,which in turn will give the cost of excavation, backfilling to be done.

11. • The entire RMC Plant works under the process of Supply Chain Management (SCM). The RMC plant was
located in the site yard.
• The cement is delivered by a tanker truck and stored in waterproof silos fitted with filters. The weighed
aggregates are transferred to the mixer ,cement and admixtures are added while mixing with required quantity of
water. The admixture here is FLOWCON PCE G166K 1-MH, which is a high range water reducing and
retarding hyper plasticizer.
• The mixer is the heart of the plant. It has a capacity of 1m3
Ready mix concrete plant
The RMC plant is the one which supplies concrete to the site in the required proportions and quantity in a
scheduled period.

13. Rebar and Splicing
• Rebar commonly called as Reinforcement bar is mainly provided in order to increase the tensile strength of the
structures where concrete is weak in tension.
• The type of rebar used in the construction of STP is Corrosion resistant steel (CRS), which is mainly used in the
Water retaining structures in order to avoid corrosion and failure of the structure.
• The machines used in the site for bending the steel, cutting the steel are Steel bar bending machine, Steel cutting
length machine where steel bending machine was used to bend the steel according to the shapes & requirements
which was mainly used in the lateral ties and steel cutting machine was used to cut the steel to the required
length to be used in the structures.

14. • When the length of the reinforcement bar has to be extended in reinforced concrete structural member splicing
is used to join two reinforcement bars to transfer the force from one bar to the joining bar. The forces are
transferred from one bar to the other through bonds in concrete forming the splice .
Lapping of reinforcement bars: Overlapping of rebar as per the codal requirement which changes as per the
structural load requirements and region.
In the site lapping length to the structures was provided in accordance to the codal provision of IS456:2000.

15. Bar Bending Schedule (BBS)
• The BBS mainly gives the idea of the quantity of steel required per section and the length of bar
required and the unit weight.
• The formula which is used to determine the unit weight :
Unit weight of steel = (d)2/ 162
where, d= diameter of the steel bar (8, 10, 12, 20etc).
2. For determining the number of bars required per unit section is obtained by dividing the total length of
the bar running by Spacing.
No of bars = Total length / Spacing +1

16. Laboratory tests
• As the technology is rapidly growing, however big the site is there is a need of proper
concrete testing methods for adequate wokability and durability so the lab is very much
significant in carrying out concrete tests.
• In the lab preliminary tests such as specific gravity of cement ,M-sand, Coarse aggregates was
carried out according to the code practice of IS:383-2016 and IS:516-1959 where the results
of
1. Specific gravity of M-sand is 2.75
2. Coarse aggregates is 2.9 and
3. Specific gravity of cement is 3.15.
Consistency test was carried out using Vicat’s apparatus where the plunger penetration should
not exceed 5-7mm ,Initial setting time and Final setting time tests was carried out where the
Vicat’s apparatus was used, this gives an idea of the setting time of cement and the strength
gain of cement with time.

18. Impact resistance test:
Aggregates test like impact resistance test was carried out by using impact
resistance testing machine where the coarse aggregates was dried and weighed
and the coarse aggregates was placed in the mould and an impact jerk of 25
blows were given where due to the heavy hammering, the coarse aggregates
became finer and the finer particles was sieved using the 2.36micron sieve and
was weighed which gives the impact resistance of aggregates and the strength to
withstand the loads and stresses.

19. Compression test:
The cubes which were casted in the site during concreting was cured and tested
for 7days and 28days for the compressive strength using Compressive testing
machine. This test is mainly done to check the strength gain of concrete for
7days and 28days and the load withstanding capacity of concrete.

20. Checking’s for Column & Wall
Column check:
The checks has to be done for the column in order to maintain the straightness and alignment of
columns when the formwork has been provided. The checks done are :
1. Line check: This check is mainly done check the straightness of the column. It is done using
the manual tape.
2. Plumb check: This check was mainly done to the columns in order to avoid the lateral
movements of column
Wall check:
Wall check is mainly done using the plumb in order to maintain the straightness of the wall from
start to end after the formwork has been placed.
Cover check is also done to the walls using tape, this is done mainly to assure that 60mm cover
blocks is been provided to the reinforcements throughout the wall and the reinforcements is at a
distance of 60mm from the shuttering.

22. Steps marking
• Laying of steps decides the view of the entire building. The steps should be marked with great care.
• The instrument which is used to check the level of steps both horizontally and vertically is Spirit Levelling.
• The formwork for threads and rise is provided along with it the spirit level is placed in the middle and checked for level both horizontally
and vertically. If the formwork provided is straight in alignment then the bubble will remain at the centre otherwise the bubble goes apart
and the formwork has to be adjusted.

23. Water path
Source
Terminal Sewage
Pumping
Station(TSPS)
Head works
Sedi pack(Primary
Clarifier)
Bioreactor
Distribution
Chamber
Secondary Clarifier
Thickener feed sump
and pump
Returned activated
sludge sump
Filteration
chamber
Disinfection
chamber
Chlorination contact
tank
Bio digestor
Sludge path
Primary
Clarifier
Primary sludge
pumping
station(PSPS)
Thickener
feed sump
and pump
Thickener
sludge
Bio Digestor
Cake formation
of sludge
Gas
generation
Electricity
generation
Treatment process
The entire Treatment plant is been divided into 2 paths :
1.Water path
2.Sludge path

24. CONCLUSION
• The internship opportunity I had with SUEZ INDIA Pvt ltd was a great chance for learning
and professional development.
• I got the opportunity to work in the different units of construction which made me gain more
knowledge.
• The site construction and the field work which was carried out in the site benefited a lot in the
management of field works.
• One main thing the internship thought me is the ‘time management’, which plays a very
important role in carrying out the tasks in a scheduled time.
• Finally, I am sure this internship opportunity makes me access the points collected in my
future growth.

25. THANK YOU