What Is Pier Foundation?

Types of Drilled Piers

• Straight-Shaft End-Bearing Pier.
• Straight-Shaft Side wall Shear Pier.
• Straight-Shaft Pier With Both Sidewall Shera and End Bearing.
• Underreamed or Belled Pier.

1. Straight-Shaft End-Bearing Pier

2. Straight-shaft side wall Shear Pier

3. Straight-Shaft Pier With Both Sidewall Shera and End Bearing

4. Underreamed or Belled Pier

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Advantages and Disadvantages of Drilled Pier Foundations

Advantages of drilled pier foundation design and construction:

• Pier of any length and size can be constructed at the site
• Construction equipment is normally mobile and construction can proceed rapidly
• Inspection of drilled holes is possible because of the larger diameter of the shafts
• Very large loads can be carried by a single drilled pier foundation thus eliminating the necessity of a pile cap
• The drilled pier is applicable to a wide variety of soil conditions
• Changes can be made in the design criteria during the progress of a job
• Ground vibration that is normally associated with driven piles is absent in drilled pier construction
• Bearing capacity can be increased by underreaming the bottom (in non-caving materials)

Disadvantages Drilled Pier Foundations:

• Installation of drilled piers needs careful supervision and quality control of all the materials used in the construction
• The method is cumbersome. It needs sufficient storage space for all the materials used in the construction
• The advantage of increased bearing capacity due to compaction in granular soil that could be obtained in driven piles is not there in drilled pier construction
• Construction of drilled piers at places where there is a heavy current of ground water flow due to artesian pressure is very difficult

Construction of Drilled Piers:

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Other Design Details of Pier Foundation:

• The loads coming on top of the foundation are calculated. The weight of the pier is not usually included.
• Establish the water level and soil profile at the location of the pier.
• Identify the bearing stratum, that is, depth up to which the pier has to be constructed. Calculate the allowable bearing capacity.
• Check for the safety of stresses in weak soil layers if present below the pier.
• Check for settlements.
• Design the shaft, bell (if required), and the cap.
• Check lateral load capacity, bending stresses, and eccentricity.
• Check for the uplift force.

Pier Foundation:

Is a Pier Foundation Good?

Pier Footing:

Is Pier a Deep Foundation?

Are Piers Considered a Permanent Foundation?

Masonry Pier:

Can I Build a House on Piers?

What Does It Mean to Pier a Foundation?

Pier Foundation Construction:

Caisson vs Pile:

What Is a Pier Foundation?

Pier Vs Pile:

Types of Piers:

• Solid Masonry piers.
• Solid RCC Piers.
• Cylindrical piers.
• Column piers or column bent.
• Trestle piers or Trestle bent.
• Pile piers or Pile bents.
• Typical Framed Piers.
• Hammerhead piers.

Drilled Piers

Drilled Pier Foundation

Foundation Piers

Piers in Construction

Pier Foundation Is Also Called

Pier Shaft

Piers for Foundation

Drilled Piers Foundation

Shaft Foundation

Pier Construction

Types of Foundation Piers

• Helical Pier.
• Steel Push Pier.
• Straight-Shaft End-Bearing Piers.
• Belled Or Under Reamed Piers.

Belled Piers

Drilling Piers

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