3. Introduction
Objective
Company profile
Company Organogram
Structure Drawing criterion
Skin friction
Estimation
Uses materials
Working procedure
Problem
Solution
Conclusion
3
4. STC group and Holdings Ltd. were starting as civil Engineering
consultant. It has become one of the most experienced and well
reputed real estate developer companies in Bangladesh. The STC
group has many construction site. But now I want present the Cast in situ
pile of a ten storied building at STC group . The reason of this
presentation is to understand the whole construction process of pile with
minimum rules and also understand the procedure of construction
problem and solution, site supervision, site safety & security.
4
5. For understand the quality in construction work.
For learn about estimating process of cast in situ pile.
For Know the construction procedure of cast in situ
pile.
For cheek the preferable condition of cast in situ pile.
For know the construction materials type of cast in
situ pile.
5
6. Dominage Group is working in Real Estate, Prefabricated
Steel Building Construction, Architectural & Engineering
Consultancy, Interior–Exterior designing, Decoration &
Power Sectors.
It was established in 2003.
Within the very short span, it has received number of
satisfied clients and very good reputation as committed
and consistent quality Provider Company.
Here has some good architects who takes good care of you,
your loving children, your guest and other family
members.
6
11. Dominage Heaven
Name of the project:
“Dominage Heaven”
Adders of the project:
Road-12, House No-7/4, Block-
A, Bosundhara R/A, Dhaka.
Area of the project: 5 katha
11
12. The pile can take load vertically end bearing and also by skin friction.
When the soil bearing capacity was not sufficient for carrying the
design load by the column footing that is why the pile foundation was
preferred for constructing a multistoried building in such a soil
condition.
Now Dominage Consultancy Ltd of “Dominage Group” is preferred to
construct the cast-in-site pile at Dominge Heaven.
12
13. When A pile develops the upward pressure on
its skin surface against the super imposed load
this is called skin friction.
Now we can say the skin friction of pile is
transferring the loads to the soil by the surface
of the pile.
In the design time we must have to care full about
skin friction value because it must be grater
then design load.
13
14. Dominage Group
This is the pile lay
out of the
dominage Heaven.
Here has 56 pile in
this project.
Total area = 5840
sft .
17'-5"
11'-1"
9'-0"
6'-8"
11'-3"
17'-5"
B
C
D
E
F
G
H
14'-11"
13'-7"
8'-1"
21'-4"
14'-11"
B
C
D
E
F
H
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9"
1'-9"
1'-9"
2'-3"
2'-3"
1'-9" 1'-3" 3'-3" 1'-9"
2'-10"
1'-2"
2'-10"
1'-9"
1'-2"
1'-9"
2'-3"
2'-3"
1'-9" 1'-3" 3'-3" 1'-9"
2'-10"
1'-2"
2'-10"
1'-9"
1'-2"
1'-9"
2'-3"
2'-3"
1'-9" 1'-3" 3'-3" 1'-9"
2'-10"
1'-2"
2'-10"
1'-9"
1'-2"
1'-9"
2'-3"
2'-3"
1'-9" 1'-3" 3'-3" 1'-9"
2'-10"
1'-2"
2'-10"
1'-9"
1'-2"
1'-9"
2'-3"
2'-3"
1'-9" 1'-3" 3'-3" 1'-9"
2'-10"
1'-2"
2'-10"
1'-9"
1'-2"
1'-9"
2'-3"
2'-3"
1'-9" 1'-3" 3'-3" 1'-9"
2'-10"
1'-2"
2'-10"
1'-9"
1'-2"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9" 2'-3" 2'-3" 1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9" 2'-3" 2'-3" 1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9" 2'-3" 2'-3" 1'-9"
1'-9"
2'-3"
2'-3"
1'-9"
1'-9" 2'-3" 2'-3" 1'-9"
3"
3"
3"
4"
6"
3"
1'-9"
10"
1'-9"
3'-4"
3'-4"
10"
1'-9"
1'-1.5"
3'-4.5" 3'-3.5"
1'-2.5"
1'-9"
82'-11"
70'-5"
14
15. In the pile use :
Length of pile = 70 ft.
Longitudinal bar= 60
grade.
Spiral rod = 40 grade.
Side clear cover = 3”.
10Ø
@
6"
C/C
FOR
THE
REST
LONG SECTION OF PILE
1'-6"
10mm Ø @ 6"c/c
3'-0"
(min.)
10mm Ø @ 5" c/c
CASTING LEVEL
ROAD LEVEL ± (0'-0")
BREAKING LEVEL (MIN. 3'-0")
H
H = 6'-0" FOR PILE SUPPORTING WATER TANK
H = 3'-0" FOR ALL OTHER PILE
A
A
B
70'
40'
20
15
16. Dept of a pile cap =
36”.
Dia of a pile = 18” .
Nos of longitudinal
bare =
Upto 40’ = 16 mm 6
nos others =16 mm
3 and 3 #12 mm.
1"
Grade Beam
PILE
PILE CAP SECTION OF FIVE PILE OR OTHER
3"CC
PARKING LEVEL (ARCH.)
3"
36"
CAP WITH 7 PILE
16mm Ø @ 4" C/C
16
17. Here is
The length of the pile, L = 70 ft
The diameter of the pile, D = 18 inch
Concrete Volume = V
Now,
V= L X A
= 70 ft X 1.77 sft
= 123.9 cft
17
18. Where,
L = 60 ft
The cross sectional area of the pile is
A = Π D2
/4
= {3.142 X (18/12)2
}/ 4 = 1.77 cft
Let, Volume= 123.9 cft
Ratio= 1:2:3
4.2.1 Portland Cement:
= (1X1.5 X123.9)/ (7) [Here, 1.5 is multiplied for dry
volume]
= 26.55 cft / 1.15 cft @ 1.15 cft per bag cement
18
19. = 23.08 bag
= 24 bags (say)
4.2.2 Sylhet Sand:
= (2 X 1.5 X 123.9) / (7)
= 53.10 cft
= 54 cft (say)
4.2.3 Stone Chips:
= (4 X 1.5 X 123.9) / (7)
= 106.2 cft = 106 cft (say)
19
20. Stirrup:
The no of ring in a single pile is = (70/4 + 12) = 29.5 ft @ 5”C/C
= {29.5*12 / (5-1)} + 1 = 90 nos
Length required for a single coil = Π X D = 3.142 X (18-3 X 2)/12
= 3.14 ft we can say
= 90 X 3.14 ft = 282.6 ft @ 0.19 kg = 53.69 kg
= 54 kg (say)
The no of ring in a single pile is = 70/2 = 35 ft@6”C/C
= {35*12 / (6-1)} + 1 = 85 Nos.
= 85 X 3.14 ft = 266.99 m @ 0.19 kg = 50.71 kg = 51 kg (say)
Total quantity of 10 mm Φ rod is for a pile = (54 + 51) kg = 105 kg.
20
21. Longitudinal bar:
16 mm dia of bar= 40 X .48 = 19.2 kg = 20 kg(say)X 6 nos of bar = 120 kg.
16 mm dia of bar= 20 X .48 = 9.6 kg = 10 kg (say) X 3 nos of bar = 30 kg.
12 mm dia of bar = 20 X .27 = 5.4 kg = 6 kg (say) X 3 nos of bar = 18 kg.
21
22. The Summery of Estimated Materials for Cast in situ pile for the Project:
Sl No Name of the
Material
Unit No of
Pile
Required
Quantity
Per Pile
Total
Required
Quantity
1 Ordinary Portland
Cement
Bags 56 24 1344 bag
2 Sylhet Sand CFT 56 54 3024 cft
3 Stone Chips CFT 56 106 5936 cft
4 Rod 16 mm Φ Ton 56 150 kg 8.4 ton
5 Rod 12 mm Φ Ton 56 18 kg 1 .0 ton
5 Rod 10 mm Φ Ton 56 105 kg 5.88 ton
22
23. Tripod stand: it is used for
making frame to handle the
total works including boring,
washing and concreting, etc.
Centrifugal Pump: It is used
for throw the drilling fluid
inside the borehole to make
easy the work and at the same
time wash the cutting materials
by chopping
Tripod stand
Centrifugal Pump
23
24. Winch machine: it is used for
lifting the drilling rod, heavy
pipe and also the reinforcement
case by a wire.
Funnel: A funnel is used for
the replacing concrete at the
pile required depth through the
trimmi pipe.
Winch Machine
Funnel
24
25. Mixer Machine: The mixer
machine is used for preparing
the concrete in its proper ratio.
Pipe Holder: The pipe holder is
used for holding the drilling rod
and trimmi pipe on the
temporary casing pipe or bore
hole. also it is needed at the
time of removing the pipe from
its inter joint and adjusting a
new one for make it longer
during drilling and concreting.
Mixer machine
Pipe Holder
25
26. Bucket: The bucket is used for
replacing concrete inside the
funnel. Bucket has a gate at the
bottom.
Pile Drum: Pipe drum is used for
the coiling the spiral strirup. It is
made by steel bar and it is
operated by the two person from
the two side.
Cashing Pipe: The cashing pipe is
the like a metal pipe which is 12 to
15 ft long and its in side diameter
is 20 to 30 inch or more then the
chisel diameter.
Bucket
Cashing pipe
26
27. Trimmi pipe: It is the steel pipe
which is inner side diameter is 8
to 10 inch. It helps to replace the
concrete to its end depth easily
and it as also protects the water to
enter the concrete. It is also used
the compaction work.
Chisel or Drill bit: The chisel
is the made of steel having in
side hollow drill bit which has
five equal flanges and that
flanges is bonded with a metal
ring that is help to cut the loose
soil easily by the boring. This
drill bit diameter is depending
upon the borehole.
Trimmi pipe
Drill bit
27
28. Dominage Group
Drilling Rod
Drilling rod: It is made of steel
and its diameter is 6 to 8 inch. It
is used for drill the bore hole.
28
29. In the Bangladesh most commonly useable process is percussion boring
process for cast in situ pile.
◦ Boring operation
◦ Borehole stabilization
◦ Preparation of reinforcement casing
◦ Placement of the rebar case into the borehole
◦ Concreting into the borehole.
29
30. Boring operation:
At first, according to the pile layout plan the
locations of the center of the piles are selected
carefully on the ground.
Before starting the boring work we must have
to do the investigation of cast-in-situ pile the
construction site.
Then set the tripod and drill bit on the top of
the pile point center. Then top of the drilling
pipe adjusted with a head where a hose pipe is
connected from the centrifugal pump.
That pump is always circulating the drilling
fluid from the settling tank to maintain the
properties of drilling fluid during borehole
operation.
30
31. Borehole stabilization:
The drilling purpose fluid is used for hole or loose the inside soil of
borehole.
In percussion boring one subjects is must follow is that fresh water should
not be used as a drilling fluid in boring operation.
For maintain the better quality bentonite is used as admixture with
drilling fluid inside the borehole.
After that it should be washed properly not more or less.
When we will see no cutting material mixed with the wash water we have
to stop the washing.
Then we can tell that the borehole is totally washed.
31
32. Preparation of reinforcement casing:
This work is must be done by the expert
labor.
The reinforcement case made by expert
because the longitudinal bars are cut
according to the measurement of the
structural drawing and it is bound with
wire and welded properly with electrodes
on a temporary hanger.
There are 8 mm to 10 mm 40 graded rod is
used as spiral stirrup.
To make the spiral ring the pile drum is
used in the field.
After the boring operation we should
have to place the reinforcement case as
soon as possible.
32
33. Placement of the rebar case into the borehole:
After ready the reinforcement case engineer must check the rebar case
is properly bound and welded.
The engineer has to be careful about the place, through which the
rebar case will be pulled over the borehole.
The rebar case should be placed by its self weight not by providing any
extra force.
If the rebar case is placed by any external force then there is a
possibility of caving or misguiding the rebar case inside the borehole.
In reinforcement case we should give the proper clear cover.
Finally the rebar case should have to hang with the case pipe .
Otherwise it will be grounded into the bore hole bottom which will be
very harmful for pile.
33
35. Concrete on the borehole:
Finally we have to place the concrete on the borehole.
For this work we are use the trimmi pipe, funnel, bucket etc.
We should not wait so long because then there is a possibility of caving
or settling inside by the suspended particles.
After discharge the concrete from the bucket then that time trimmi pipe
and funnel have to move up and down that time it cleaned properly.
From this up and down process concrete will be compressed.
Finally the concreting case pipe will be withdrawn carefully so that
there is no chance for withdrawing the concrete or the rebar casing.
35
37. The proportion of the concrete was not maintained carefully.
Stone chips is not well graded and not bolder crash.
Trimmi pipe was divided from the joint.
Safety and security is not proper maintained.
Rebar case was displaced from the same position.
Rebar case caring time happen some accident.
Fast aid box is not available in the projects.
Pile caving occurred during replacing rebar case for two piles.
37
39. To the mixing time we have to careful for supervision.
Stone chips must take the bolder crashed.
Before joint must cheek the threat of the trimmi pipe.
Rebar case replace time we should be very careful about the accident.
Fast aid box must have to stoke in the site.
Washing time must have to care about the boring fluid.
39
40. To understand the layout and project preparation
are very important in any construction.
To supervision of cast in situ pile & design work in
an appropriate manner.
To control the quality of cast in situ pile.
Otherwise our dreams will not comes in true.
40
