MD. RASHEDUL ISLAMID: 12106068SUB: ART 203

SEC: B

IUBAT- International University of Business Agriculture and Technology. 1

Construction of pre-custpile of a ten storied commercial building

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Introduction Objective Company profile Company Organogram Structure Drawing criterion Skin friction Estimation Uses materials Working procedure Problem Solution Conclusion

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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.

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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.

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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.

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Company OrganogramCompany OrganogramCompany OrganogramCompany Organogram

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Dominage Oasis, Plot#15, Road#8, Sec.#4, Uttara, Dhaka.8

Dominage Pride, Plot#37, Road#11, Sec.#13, Uttara, Dhaka

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Dominage parloto sisily, Plot#43, Road#108, Block# D, Boshundhara, Dhaka.

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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

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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.

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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.

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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'-1

1"13

'-7"

8'-1

"21

'-4"

14'-1

1"

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'-1

0"1'

-2"

2'-1

0"1'-9

"

1'-2

"

1'-9

"2'

-3"

2'-3

"

1'-9" 1'-3" 3'-3" 1'-9"

2'-1

0"1'

-2"

2'-1

0"1'-9

"

1'-2

"

1'-9

"2'

-3"

2'-3

"1'-9" 1'-3" 3'-3" 1'-9"

2'-1

0"1'

-2"

2'-1

0"1'-9

"

1'-2

"

1'-9

"2'

-3"

2'-3

"

1'-9" 1'-3" 3'-3" 1'-9"

2'-1

0"1'

-2"

2'-1

0"1'-9

"

1'-2

"

1'-9

"2'

-3"

2'-3

"

1'-9" 1'-3" 3'-3" 1'-9"

2'-1

0"1'

-2"

2'-1

0"1'-9

"

1'-2

"

1'-9

"2'

-3"

2'-3

"

1'-9" 1'-3" 3'-3" 1'-9"

2'-1

0"1'

-2"

2'-1

0"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'-1

1"

70'-5"

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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

RES

T

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

AA

B

70'

40'

2015

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

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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

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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 cement18

= 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)

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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.

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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.

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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

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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

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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

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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

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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

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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

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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.

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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.

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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.

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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.

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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.

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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.

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Image of Rebar case Placing

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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.

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Image of concreting

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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.

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Fig- stone chips

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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.

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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.

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Any Question?

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