Construction process of ash dyke chhabra thermal power plant . all the process of construction disscussed in this ppt.

1. ARYA INSTITUTE OF
ENGINEERING TECHNOLOGY
AND MANAGEMENT
CHHABRA THERMAL POWER PLANT
ASH DYKE CONSTRUCTION
SUBMITTED TO SUBMITTED BY
Civil Engineering Department
Chandra Mohan Lodha
4th Year Student

2. CONTENTS
1. Introduction
2. Ash Dyke
3. Machinery Used In Construction
4. Materials Used In Ash Pond Construction
5. Preparation Of Base
6. Construction Process
7. Drainage System Of Dyke
8. Use Of Dyke
9. Special Features
10. Conclusion

3. INTRODUCTION
Chhabra Thermal Power Plant is one of Rajasthan coal fired power plant. It is located at
Chowki Motipura (Village) of tehsil Chhabra in Rajasthan Baran district.
The planned capacity of power plant is 2650MW at the end of 12th Five year plan.
The first and 2nd unit at Chhabra super thermal power plant was set up at a cost of Rs2,350
crore. Chhabra is all set to become a power generation hub in the state as in the second phase
two more units with a capacity of 250 MW each will be installed.
Rajasthan Rajya Vidyut Utpadan Nigam Limited (RVUN) has been entrusted with the job of
development of power projects under state sector, in the state along with operation &
maintenance of state owned power stations. Government of Rajasthan constituted the
Rajasthan Rajya Vidyut Utpadan Nigam Ltd. (RVUN) under Companies Act-1956 on 19th July,
2000. The Nigam is since playing lead role in giving highest priority to the power generation for
manifold and rapid development of the state.
The generating Stations of RVUN have acquired a distinctive reputation in the country for their
efficient and economic power generation.
Chhabra Thermal Power Station is a 1000-megawatt (MW) coal-fired power station in
Rajasthan state, India.
A 1320 MW expansion of the power station is under construction.

4. The power station is owned and operated by Rajasthan Rajya Vidyut Utpadhan Nigam (RVUN or
RRVUN), a government-owned utility. It began as a 500 MW power station, commissioned in
2009-2010. The power station was later expanded by two 250 MW units (Units 3&4). Unit 3 was
commissioned in 2013, and unit 4 in 2014.
ISTALLED CAPACITY
Unit 1 - 250 MW - Operating (commissioned October 30, 2009)
Unit 2 - 250 MW - Operating (commissioned May 4, 2010)
Unit 3 - 250 MW - Operating (commissioned September 14, 2013)
Unit 4 - 250 MW - Operating (commissioned 30 June 2014)
Unit 5 - 660 MW - Construction
Unit 6 - 660 MW - Construction

6. Ash Dyke/pond
An ash pond is an engineered structure for the disposal of bottom ash and fly ash. The wet
disposal of ash into ash ponds is the most common ash disposal method , but other methods
include dry disposal in landfills. Dry-handled ash is often recycled into useful building materials.
Wet disposal has been preferred due to economic reasons, but increasing environmental
concerns regarding leachate from ponds has decreased the popularity of wet disposal. The wet
method consists of constructing a large "pond" and filling it with fly ash slurry, allowing the
water to drain and evaporate from the fly ash over time. Ash ponds are generally formed using
a ring embankment to enclose the disposal site. The embankments are designed using similar
design parameters as embankment dams, including zoned construction with clay cores. The
design process is primarily focused on handling seepage and ensuring slope stability.

7. Machinery Used In Construction
Machinery used in ash pond construction like
• Poke Land
• Jcb
• Dozer
• Grader
• Roller
• Trucks

8. Poke Land :- Poke land is a hydraulic machine which used in the digging.
It is used in the larger project work and speedily constructional work . It
have higher load bearing capacity.
The poke land machine is also available in two types
1.Three hundred poke land
2. Two hundred poke land
Both the machines have different capacity according to the design
capacity .

9. JCB :- jcb is a earth moving machine which used in the construction work . It give more
importance in the construction filed . It is multi used machine in the construction work .it is
provide faster work .
DOZER :- It is a earth cutting machine which used in the larger project work . Mostly it is used
in the depth of earth about 20m for the harder stone cutting/collection of stone particles.
It have front larger size part which is very used and have higher capacity.
GRADER :-A grader, also commonly referred to as a road grader, a blade, a maintainer, or a
motor grader, is a construction machine with a long blade used to create a flat surface during
the grading process. second blade that is placed in front of the front axle. Some construction
personnel refer to the entire machine as "the blade". Capacities range from a blade width of
2.50 to 7.30 m and engines from 93–373 kW(125–500 hp).

10. ROLLER :-A road roller (sometimes called a roller-compactor, or just roller) is a compactor
type engineering vehicle used to compact soil, gravel, concrete, or asphalt in the construction of
roads and foundations, similar rollers are used also at landfills or in agriculture.
In some parts of the world, road rollers are still known colloquially as steam rollers, regardless of
their method of propulsion. This typically only applies to the largest examples (used for road-
making).
Trucks :-Normally trucks are used for the transportation but in the construction field it is used
for sand , soil, stone, cement etc material dumping/supply. From one place to another place.
Modern trucks are largely powered by diesel engines, although small to medium size trucks with
gasoline engines.

11. Material Used In Ash Pond Construction
For the ash pond construction many materials required .
Some materials are :-
Concrete (M7.5, M25)
Bricks (Fly Ash )
Cement
Soil
LDPE ( 150&270 micron thick geomembrane )
Black cotton ( Black Sand 300mm )

12. Preparation Of Base
The preparation of base for the ash pond construction is simplest process. Firstly survey of the
all area and test of field like soil test , ground water level of area .marked the area required for
the ash pond construction . After that dig the depth about 12meter depth all area by machinery
used . Finished the base surface clearly with 0 degree angles. The ash pond all sides having
width 12 to 15 meter for vehicle travelling and transportation . The ash pond all walls having
slope 60 degree.
Cutting the all walls with 60 degree slope and finish properly . Around the ash pond drainage
system must required so drainage base also cut by machines.
Now base is complete for the ash pond design process.

13. Construction Process Of Ash Dyke
The Construction of ash dyke required special skills and engineering knowledge .
The Construction of ash dyke in the parts like
1. Construction of trench beam
2. Construction of base
3. Construction of sloping walls
4. Construction of bad
1. Construction Of Trench Beam :- The design of trench beam according to the drawing all the
measurements used according to the drawing. The trench beam located nearly the sloping wall
base point. The beam having size 500mm height , 230 mm width (500*230)mm and concrete
M7.5 used in the construction.
2. Construction Of Base :- After cut and finishing the surface 150mm depth soil fill in the all base
area and then soil covered by175 micron thick LDPE spread in all the area . And then LDPE jointed
by the electric jointing machine.

14. STEP -3
CONSTRUCTION OF BASE
STEP -1 STEP -2

15. 3.Construction Of Sloping Walls:- The design of sloping walls of ash dyke required technical
specifications . Design according to the given drawing .
The concrete used in the wall construction is M25.
Construction of sloping walls are as follows given dimensions.
Length 9m , width 3m , thickness 75mm.

16. 4. Construction Of Bad :- the construction of ash dyke bad is similar process as like
dams bad process.
The width of bad is equal to 15metere with flat surface. It is also used for transportation in the
construction time .
It is made up of sand with compaction , compaction should be completed by the vibration roller.
The length of bad is depends upon the size of dyke.

17. Construction Of Drainage System
The drainage system of ash dyke is outer side of the dyke. With special supervision and according to
the given drawing.
The drainage system base completed by using of concrete M7.5 and walls having dimensions height
800mm , width 350mm and length depends upon the drain length.
The slope between starting point of wall and end point of wall is 1:0.5
The drain walls constructed by the cement , sand , bricks with proper ratio of cement sand and water.

18. PRIMARILY, THE FLY ASH IS DISPOSED OFF USING EITHER DRY OR WET DISPOSAL
SCHEME.
IN DRY DISPOSAL, THE FLY ASH IS TRANSPORTED BY TRUCK, CHUTE OR CONVEYOR AT
THE SITE AND DISPOSED OFF BY CONSTRUCTING A DRY EMBANKMENT (DYKE).
IN WET DISPOSAL, THE FLY ASH IS TRANSPORTED AS SLURRY THROUGH PIPE AND
DISPOSED OFF IN IMPOUNDMENT CALLED "ASH POND".
Use of Ash Dyke

19. Special Features
• Use Of LDPE (175 micron thick membrane) to protect under ground water.
• Use of trench beam to maintain black cotton (Black Soil).
• Use of sloping walls with concrete to protect seepage of water.
• Use of proper drainage system around the ash dyke.

20. CONCLUSION
The construction of ash dyke for the fly ash disposal and utilization in the thermal
power plants is compulsory.
But in the ctpp power plant ash dyke construction is something different as
compare to other ash dykes.
Comparison clarify by the special features of the dyke.
The engineering summer internship time is very good for my practical knowledge
of the field.