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INTRODUCTION TO DRILLED PIER

FOUNDATION

Boken Jempen

MT/14/GTE/007

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  INTRODUCTION: DRILLED PIERS

Type of deep foundation

 Constructed by drilling a hole in

ground

 According to American Concrete

Institute, the limiting diameter is

0.76m

 Also calleddrilled shaftor

drilled caisson

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 The drilled piers are

sought in case of

Weak soil

Too large loads

To avoid vibrations.

 USES

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 TYPES

1. Straight

Shaft

2. Belled Shaft 3. Straight

Shaft

rocketed

into rock

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 PIERS IN OPEN EXCAVATION

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CONSTRUCTION OF PIERS IN DIFFERENT

SOILS

Piers in sand

Piers in clay

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OPEN SHAFT METHODS

The traditional open-shaft methods:

Chicago method

Gow method

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CONSTRUCTION PROBLEMS

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CONSTRUCTION OF DRILLED PIERS

Steps involved in modern method:

Mechanical excavation

Use of CasingUse of Bentonite slurry

Physical inspection

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ADVANTAGES AND DISADVANTAGES

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THANK YOU