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Prestressed Concrete Poles  

First designed and constructed by French engineer Freyssinet in the middle 1930s, prestressed concrete poles are used today worldwide for

  • Flag poles
  • Sign poles
  • Telephone poles
  • Telegraph poles
  • Street lights
  • Electric Power Lines
  • Atenna Masts

Compared with normally reinforced concrete poles, prestressed concrete poles offer several advantages: prestressed poles are lighter and stronger, and they require less reinforcing steel. The concrete is generally in compression, so cracking is unlikely. They have a smoother surface that is denser and less permeable. This lower permeability in combination with the absence of cracks prevents corrosion of reinforcement or prestressing wire.
A pole generally acts as a cantilevered structure, and should be designed and analyzed as a tapered member with combined axial and bending loads.

Comparison Between Concrete & Wooden Poles

PROPERTIES

CONCRETE POLES

WOOD POLES

LIFE SPAN

50 years

20 years

COST OF LINE

Long spans resulting in low value of Lines

Short spans increase cost

SAG

Little sag as concrete pole can sustain tension

Higher sags as wood poles can’t sustain tensions.

WEIGHT

HIGHER

LOWER

CORROSION

Poles will not corrode or rot

LESS RESISTANCE

SHAPE

Rectangular profile is easy to stack than round

ROUND

SMOOTHNESS

HIGH

LOW

DUARBAILITY

HIGH

LOW

MAINTAINANCE

FREE

NEED

PROTECTIVE COATINGS

NOT REQUIRED

REQUIRED

ABSORBANCY

Traffic and any other markings can be painted on without the need for special  primers

Special primers require

VERSATILITY

Constant in taper and dimension. Handling and  installation equipment can be standardized

Not constant dimension

AESTHETICS

Aesthetically more pleasing and environmentally friendly

Less pleasing and environmentally friendly

THEFT

Weight of poles discourages theft

Easy theft

RESISTANT TO FIRE AND TERMITES

HIGH

LOW

VERSATILITY

Made to client’s specifications with preformed  holes

LESS VERSATILITY

WIRING

Hollow raceway for easy internal wiring and components

Open wiring

WATER RESISTANCE

HIGH

LOW

FIRE PROOF

HIGH

LOW

ANTICORROSIVE

HIGH

LOW

DAMP-PROOF

HIGH

LOW

RESISTANCE TO WIND

HIGH

LOW

ENVIRONMENT-FRIENDLY

HIGH

LOW

SPANS

HIGH

LOW

EMPLOYMENT

MORE

VERY LESS

STRENGTH

HIGH

LOW

HARMONIC VIBRATION

not susceptible as extremely rigid

susceptible

INSTALLATION

Direct burial in soil

Need base plate

DISPOSAL / RECYCLE

Only Steel have resale  Value

Some Value

HANDLING

MECHANICAL DUE TO HEAVY WEIGHT

EASY

WEIGHT

HIGHER

LESS

HEIGHTS

Can be much higher by adding plates

Limited

QUALITY

Consistent

Not consistent

STRAIGHTNESS

Consistent

Not consistent

APPEARNACE

GOOD

BAD

UNIT COST

MORE

LESS

INSULATION

good

excellent

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