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Pile foundation and Pile
driving techniques
1
Unit : 05
Advanced Construction Methods
Prepared by
Mr. P .A. Nadgouda
Assistant Professor
D.Y.Patil College of Engineering & Technology
Kolhapur
Contents
1. Introduction to deep foundations
2. Classifications of deep foundations
3. Introduction to pile foundations
4. Uses of pile foundations
5. Classifications of pile foundations
6. Pile installation methods
7. Pile Spacing
8. Negative Skin Frictions
When We Use Deep Foundation
•Depth/Width >4
•Low Bearing Capacity of soil .
•Non availability of proper bearing stratum
at shallow depths.
•Heavy loads from the super structure for
which shallow foundation may not be
economical or feasible.
CLASSIFICATION OF DEEP FOUNDATIONS:
The types of deep foundations are
• Pile
• Pier
• Caissons
• Well-foundation
• Sheet Piles
Caissons or well foundations are heavier in
section and they are sunk to the required depth.
Pile Foundations
• A timber, steel or reinforced concrete post usually
vertical, used as a structural element for transferring
the loads at the required depth in the deep
foundations is called PILE.
• These are the long slender members either driven or
cast-in-situ and may be subjected to vertical or
lateral or vertical plus lateral loads.
Preparation of reinforcement
Lowering of reinforcement
Different steps of pile Execution
Different steps of pile Execution
Lowering of tremmy
Pouring of concrete
Pile load test
Preparation of pile cap
Different steps of pile Execution
USE OF PILES:
• Piles may be used for the following purposes,
1. End Bearing or compressive strength: To transfer the load
through a soft soil to a suitable bearing stratum by means
of end bearing of the piles.
2. Scour depth. To transfer the load through Water, for any
hydraulic structure because in this case, we have to keep
the foundation at the scour depth below the bed level.
For River Ravi Scour depth is 30 to 35m below the bed.
So if we go for the shallow foundation, we will have to
make an open pit, coffer dam diversion of River etc. and it
is highly uneconomical.
3. Tension or Uplift: For a very tall structure (tower), even if
the Soil is very good, but here the overturning is the
problem. So either make the base very large (Thick raft) or
make deep foundation.
USE OF PILES:
4) Vibration Control: if a machine is generating high vibrations,
then to absorb the vibrations either make a massive block or
the next choice is deep foundation, But Massive black is very
expensive. e.g. At Terbela the shaft of Turbine is 2m and
when it runs there area a lot of vibrations.
5) Compaction Piles: In order to compact the granular soils and
to increase their bearing capacity, piles are used (compaction
Piles).
6) Anchor Piles: To provide Anchorage against horizontal pull
from sheet piling walls or other pulling forces.
7) Fender piles: To protect Water front structure against impact
from ships or other floating objects.
8) Batter piles: To resist large horizontal or inclined forces.
9) Rapid Construction: Piles can also be used if the time
schedule has much importance.
CLASSIFICATION OF PILES:
• With respect to:
1.Mode of construction
2.Material of construction
3.Material of load
4.Function of pile
5.Shape
6.Size
CLASSIFICATION W.R.T MODE OF CONSTRUCTION:
1. Pre-cast (Driven Piles )
2. Cast in-situ Piles (Bored Piles)
• Under sized Bore.(It is feasible because of less noise ,
under sized hole is dug and full size pile is driven, (NABWI
MOSQUE PILES).
• By driving the piles, the soil is displaced so type is
a) High volume displaced piles (vol. almost equal to vol.of
pile).
b) No volume displaced piles.
c) Low volume displaced piles.
CLASSIFICATION W.R.T MATERIAL OF
CONSTRUCTION:
1) Timber piles: (Trunk of a Wooden tree, the
oldest pile)
2) Concrete pile
3) Steel pile
4) Composite pile: (Certain portion by one
material and certain portion by other
material)
CLASSIFICATION W.R.T MATERIAL OF LOAD:
Some times skin friction is predominant and
sometimes the End bearing so
1) Frictional Pile
If major part is taken by the shaft of pile. When
very Weak soils of large depths are available.
2) End Bearing Pile
When a soil layer of reasonable strength is
available at a reasonable depth.
3. Combination of Two. (Friction cum bearing piles)
CLASSIFICATION W.R.T FUNCTION OF PILE:
1) Compression pile: (To resist the comp. load)
2) Tension pile or Anchor pile
3) Compaction pile: (granular soil i.e. very loose sand
can be compacted by driving the piles at one
place, then are pulled out and driven at the next
place, in this way sand is densified).
4) Fender piles: (Used near sea-part to protect the
Harbour, just to absorb the impact of floating
objects)
5) Batter piles: (Provided at an inclination their
stability is more against overturning).
6) Sheet piles.(To reduce seepage or to provide lateral
stability).
CLASSIFICATION W.R.T SHAPE:
1. Round Piles
2. Square Piles
3. Octagonal Piles
4. I-Shaped Piles
5. Straight Piles
6. Tapered Piles
7. Bell-Bottom Piles
8. Screw Piles
a) X- cross-section b) H - cross-section c) steel pipe
Steel piles cross-sections
CLASSIFICATION W.R.T SIZE:
1. Large Dia Pile: ( > 24”)
2. Small Dia Pile: ( > 6” to 24”)
3. Micro Dia Pile: (= 4” to 6”)
(These are used for specific projects I,e for Repair ).
1. Root Pile(Rectangular) Used for special
projects i,e for under pressing, Repair).
If > 24” then These are called as pier
PILE INSTALLATION METHODS
• The installation process and method of installations are
equally important factors as of the design process of pile
foundations. In this section we will discuss the two main
types of pile installation methods;
• installation by pile hammer and
• boring by mechanical auger.
• In order to avoid damages to the piles, during design,
installation Methods and installation equipment
should be carefully selected.
Pile driving methods (displacement piles)
• Methods of pile driving can be categorized as
follows:
• Dropping weight
• Explosion
• Vibration
• Jacking (restricted to micro-pilling)
• Jetting
Drop hammers
• A hammer with approximately the weight of the pile
is raised a suitable height in a guide and released to
strike the pile head. This is a simple form of hammer
used in conjunction with light frames and test piling,
where it may be uneconomical to bring a steam boiler
or compressor on to a site to drive very limited
number of piles.
• There are two main types of drop hammers:
• Single-acting steam or compressed-air hammers
• Double-acting pile hammers
Pile driving using hammer
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pile_foundation_1.ppt

  • 1. Pile foundation and Pile driving techniques 1 Unit : 05 Advanced Construction Methods Prepared by Mr. P .A. Nadgouda Assistant Professor D.Y.Patil College of Engineering & Technology Kolhapur
  • 2. Contents 1. Introduction to deep foundations 2. Classifications of deep foundations 3. Introduction to pile foundations 4. Uses of pile foundations 5. Classifications of pile foundations 6. Pile installation methods 7. Pile Spacing 8. Negative Skin Frictions
  • 3. When We Use Deep Foundation •Depth/Width >4 •Low Bearing Capacity of soil . •Non availability of proper bearing stratum at shallow depths. •Heavy loads from the super structure for which shallow foundation may not be economical or feasible.
  • 4. CLASSIFICATION OF DEEP FOUNDATIONS: The types of deep foundations are • Pile • Pier • Caissons • Well-foundation • Sheet Piles Caissons or well foundations are heavier in section and they are sunk to the required depth.
  • 5. Pile Foundations • A timber, steel or reinforced concrete post usually vertical, used as a structural element for transferring the loads at the required depth in the deep foundations is called PILE. • These are the long slender members either driven or cast-in-situ and may be subjected to vertical or lateral or vertical plus lateral loads.
  • 6. Preparation of reinforcement Lowering of reinforcement Different steps of pile Execution
  • 7. Different steps of pile Execution Lowering of tremmy Pouring of concrete
  • 8. Pile load test Preparation of pile cap Different steps of pile Execution
  • 9. USE OF PILES: • Piles may be used for the following purposes, 1. End Bearing or compressive strength: To transfer the load through a soft soil to a suitable bearing stratum by means of end bearing of the piles. 2. Scour depth. To transfer the load through Water, for any hydraulic structure because in this case, we have to keep the foundation at the scour depth below the bed level. For River Ravi Scour depth is 30 to 35m below the bed. So if we go for the shallow foundation, we will have to make an open pit, coffer dam diversion of River etc. and it is highly uneconomical. 3. Tension or Uplift: For a very tall structure (tower), even if the Soil is very good, but here the overturning is the problem. So either make the base very large (Thick raft) or make deep foundation.
  • 10. USE OF PILES: 4) Vibration Control: if a machine is generating high vibrations, then to absorb the vibrations either make a massive block or the next choice is deep foundation, But Massive black is very expensive. e.g. At Terbela the shaft of Turbine is 2m and when it runs there area a lot of vibrations. 5) Compaction Piles: In order to compact the granular soils and to increase their bearing capacity, piles are used (compaction Piles). 6) Anchor Piles: To provide Anchorage against horizontal pull from sheet piling walls or other pulling forces. 7) Fender piles: To protect Water front structure against impact from ships or other floating objects. 8) Batter piles: To resist large horizontal or inclined forces. 9) Rapid Construction: Piles can also be used if the time schedule has much importance.
  • 11. CLASSIFICATION OF PILES: • With respect to: 1.Mode of construction 2.Material of construction 3.Material of load 4.Function of pile 5.Shape 6.Size
  • 12. CLASSIFICATION W.R.T MODE OF CONSTRUCTION: 1. Pre-cast (Driven Piles ) 2. Cast in-situ Piles (Bored Piles) • Under sized Bore.(It is feasible because of less noise , under sized hole is dug and full size pile is driven, (NABWI MOSQUE PILES). • By driving the piles, the soil is displaced so type is a) High volume displaced piles (vol. almost equal to vol.of pile). b) No volume displaced piles. c) Low volume displaced piles.
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  • 14. CLASSIFICATION W.R.T MATERIAL OF CONSTRUCTION: 1) Timber piles: (Trunk of a Wooden tree, the oldest pile) 2) Concrete pile 3) Steel pile 4) Composite pile: (Certain portion by one material and certain portion by other material)
  • 15. CLASSIFICATION W.R.T MATERIAL OF LOAD: Some times skin friction is predominant and sometimes the End bearing so 1) Frictional Pile If major part is taken by the shaft of pile. When very Weak soils of large depths are available. 2) End Bearing Pile When a soil layer of reasonable strength is available at a reasonable depth. 3. Combination of Two. (Friction cum bearing piles)
  • 16. CLASSIFICATION W.R.T FUNCTION OF PILE: 1) Compression pile: (To resist the comp. load) 2) Tension pile or Anchor pile 3) Compaction pile: (granular soil i.e. very loose sand can be compacted by driving the piles at one place, then are pulled out and driven at the next place, in this way sand is densified). 4) Fender piles: (Used near sea-part to protect the Harbour, just to absorb the impact of floating objects) 5) Batter piles: (Provided at an inclination their stability is more against overturning). 6) Sheet piles.(To reduce seepage or to provide lateral stability).
  • 17. CLASSIFICATION W.R.T SHAPE: 1. Round Piles 2. Square Piles 3. Octagonal Piles 4. I-Shaped Piles 5. Straight Piles 6. Tapered Piles 7. Bell-Bottom Piles 8. Screw Piles
  • 18. a) X- cross-section b) H - cross-section c) steel pipe Steel piles cross-sections
  • 19. CLASSIFICATION W.R.T SIZE: 1. Large Dia Pile: ( > 24”) 2. Small Dia Pile: ( > 6” to 24”) 3. Micro Dia Pile: (= 4” to 6”) (These are used for specific projects I,e for Repair ). 1. Root Pile(Rectangular) Used for special projects i,e for under pressing, Repair). If > 24” then These are called as pier
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  • 24. PILE INSTALLATION METHODS • The installation process and method of installations are equally important factors as of the design process of pile foundations. In this section we will discuss the two main types of pile installation methods; • installation by pile hammer and • boring by mechanical auger. • In order to avoid damages to the piles, during design, installation Methods and installation equipment should be carefully selected.
  • 25. Pile driving methods (displacement piles) • Methods of pile driving can be categorized as follows: • Dropping weight • Explosion • Vibration • Jacking (restricted to micro-pilling) • Jetting
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  • 27. Drop hammers • A hammer with approximately the weight of the pile is raised a suitable height in a guide and released to strike the pile head. This is a simple form of hammer used in conjunction with light frames and test piling, where it may be uneconomical to bring a steam boiler or compressor on to a site to drive very limited number of piles. • There are two main types of drop hammers: • Single-acting steam or compressed-air hammers • Double-acting pile hammers
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