WELCOME

Presentation on

FLYOVER PILING

Prepared by: (GROUP-5)12.01.03.008; 12.01.03.016;12.01.03.019; 12.01.03.025;12.01.03.026; 12.01.03.032;12.01.03.035; 12.01.03.038;

08.02.03.020;

Course Teacher:Md. Arman ChowdhuryWahid Hasan

What is Pile?

• It is a long slender foundation member made either of timber,structural steel or concrete to transfer the load of the structure in deep foundation.

Fig- Pile

Why do we use Pile?W

eak

Soil

Bed Rock

Structure

Dee

p Fo

unda

tion

PILE

Advantage of Piling

• To take the structure deep into the ground and hence preventing over turning.

• To provide a strong bedrock soil (i.e. higher bearing capacity) for the structure and transfer the total load of the structure.

• To distribute the weight of the structure over a large area.

• To prevent unequal settlement.

Types of pile

Depending on their function:

• Bearing piles• Friction piles• Sheet piles• Anchor piles• Batter piles• Fender piles• Compaction piles

Depending on their materials:

• Timber piles• Concrete piles• Composite piles• Steel piles

Casting of a Flyover Pile(cast in situ)

(Location- Mouchak Mogbazar Flyover)

•At first, the locations of piles are fixed by theodolite surveying.

1. Excavation Started

2. If utility pipes are found during excavation, then the location point of pile is changed

3. No utility within 2 meter

Hydraulic Rig machine Cutting Bucket

•After excavating 6m temporary steel case is placed and then bentonite is used.

• Excavation continues according to design using rotary rig machine

•Using hose pipe to remove Bentonite mixed water after excavation process is completed

Making of Steel Case

•Process of making the vertical reinforcements in circular arrangement

•Circular rings are used to make stirrups and to maintain perfect circular arrangement

Stirrups

Completion of steel case

Thread Coupler

•It is used to join the inner rebars

Punching machine Plane coupler

After applying pressure

(N.B: These two couplers are used for the very first time in our country)

Circular CC block

weiring

welding

•Placing of steel case

Placing of trimmy pipe Started casting

•After completion of casting

Top head of the pile is removed Removed pile heads

Load test of pile :

•Load test is done by using hydraulic jack Load test continued (each block weighs 1 ton)

One layer BFS to level the surface of the pile cap

Casting on the BFS After Casting on the BFS

Placing of reinforcement after initial casting of pile cap

Chair

Completion of placing reinforcement of pile cap

Completion of casting of pile cap

Observations:

• The water that they used to admix the bentonite was recycled for next use also.

•They maintained the weiring and welding properly to make steel case strong enough to carry the load.

•When they broke the pile head, it should be above 6” from the ground surface. But in some cases accidently, they couldn’t manage to do so. Therefore, they placed an extra layer of CC of 6” which shouldn’t be as it couldn’t take the load properly.

THANK YOU…

Do you have any Questions?