1. EQUIPMENTS FOR ERECTION AND
COMPACTION

2. EQUIPMENTS FOR COMPACTION
 Compaction is the process where by material particles
are constrained to pack more closely together through
a reduction of air void content generally by mechanical
means

3. Types of compactors
 static smooth wheeled rollers
 sheep foot or pad foot rollers
 pneumatic tyred rollers
 vibratory rollers
 Tamper and vibrating plates

5. Static smooth wheeled rollers
 Rollers used with or without ballast
 Not effective on uniformly graded sand, gravel or silt
and on over moist cohesive soil.
 Rely on weight alone to compact the material over
which they pass
 The unit of 80 to 10 tonnes imparting pressure of 20 to
40 kg per linear cm are generally used.
 Lighter rollers of weight up to 1 ton are also available.

6. Sheepfoot or padfoot rollers
 Self driven or tractor driven
 Suitable on cohesive soils specially when water
content is on the higher side.
 Higher degree of compaction at faster rate.

7. Sheepfoot roller

8. Pneumatic-tyred rollers
 Used for both in earthwork and bituminous road



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construction.
Produce more even compaction across the rolling
width than wide steel wheel smooth rollers
Eliminate surface cracking and material crushing on
bituminous wear courses
Produce an almost sealed finish
Weigthts ranging 6-30 tonnes with 500-4000 kg per
tyre
Tyre pressure 2-8 kg/sq.cm

9. Rubber pneumatic tyred roller

10. Vibratory rollers
 Eccentric weights within the rolls produce vibration
 Particles of material brought closer together as air
voids eliminated
 Very effective on free draining type soil and granular
base course
 Not effective on uniformly graded sand, gravel or silt.
 Effective pressure around twice the static weight of the
roller.

11. Tamper and vibrating plates
 Used to tamp footing, trench bottom, position posts,
lay paving slabs or in any small areas.
 Operational weights fall approximately 80kg for
tamper 300 for vibrating plates.
 Deliver 800-4500 blow per min.
 2.5-12.5 H.P powered engine

12. Static compaction equipment
 towed static smooth compactors
 static sheep foot or pad foot compactors
 static three wheel self propelled compactors
 static tandem compactors
 three axle static compactors

13. Spike rollers
flat head tamping roller,

14. Vibratory compaction equipments
a)
Tandem vibratory compactors
b)
Towed vibratory compactors
c)
Towed sheep foot and tamping foot vibratory
compactors
d)
Self propelled vibratory compactors
e)
Hand guided vibratory compactors

15. Tandem vibratory compactors
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Dual dive or single axle dive
Available in two type:
•
Sngle drum vibrating
•
Both drum vibrating
double drum vibrator have 80% increased output than to
single drum vibrator

16. Towed vibratory compactor
 Used for compaction of cohesive soils fine and coarse
grained mixed soil, and rocky materials.
 Heavy towed vibratory compactors are used for the
compaction of extremely thick layers(in dam or
embankment construction)

17. Towed sheepfoot or tamping foot vibratory compactors
 Used for compaction of highly cohesive soil
 Kneading and crushing effect improves the compaction
performance.
 Depending on the shape of foot: sheepfoot vibrator or
tamping foot vibrator
 Sheepfoot rolls: cylindrical shape foot, small contact area
 Tamping foot rolls: larger contact area

18. Self propelled vibratory compactors
 Large varieties available
 8-12 tons dead weight
 Some of job condition :
• Large vibratory steel roll in the front and two rubber
tyres in the rear. The rubber tyres may either be smooth
one for bituminous work or having thread for earth
compaction work. Front roll (drum ) may be smooth,
padded, sheep foot or rubber coated.
• Vibratory steel roll in the front and two static steel rolls
in the rear for multipurpose work.

19. Handguided vibratory compactor
 These may be either,
•
•
Single drum: vibrate with operator guiding behind
Duplex drum: one or both drum vibrating
 Less than 1m width
 Excellent gradability and cross-country mobility
 Used for : trenches, slopes, parking lots, small repair jobs,
sport centres, inside building and other confined spaces, and
preparing foot and bicycle paths

20. Erecting equipments
 Operation of lifting a weight from one location and
moving it to another location which is at a reasonable
distance and then dumping it.

21. cranes
Mobile crane
Mobile crane

22. Cranes can classified into following classes
1.
2.
3.
4.
5.
6.
Derrick cranes
Mobile cranes
Hydraulic cranes
Overhead cranes
Traveller cranes
Tower cranes

23. Derrick cranes
 Consist of :
•
•
•
•
a mast,
a boom,
bull wheel on which it rotates
Supporting membrane
 Used : construction projects, plant erection, loading and
unloading of cargoes, ship building etc.
 Boom can revolve through 360ᵒ
 Bullwheel attach mast and rotate
 Operated by diesel engine or by electric motor

24.  Some time mounted on rail wagon for quick transport
and are known as whirler
 Capacities 40tones with 25m boom length and 15m
work radius

25. Mobile cranes
 Either crawler mounted or wheel mounted
 Crawler mounted:
-ability to operate unmade ground
-low ground bearing pressure
-move slowly
- used in tough terrain
-economically used where ground conditions are
poor and operate in a limited area

26.  Wheel mounted crane:
-high mobility
-can travel upto 70-75km per hr
-designed for long distance travel
-operate on firm ground
 Mobile cranes have four motions: hoisting, dericking,
slewing and traveling.

27. Hydraulic cranes
 Operation are hydraulically powered including
extension
Retraction of out-riggers, extension and shortening of
boom
 Power generated by rotary oil pumps
 Quick change of boom length and easy and quick
change of angle
 Beside operation of hoisting slewing and derricking
can be performed simultaneously

28. Overhead ( gantry) crane
 Used for handling loads over a long rectangular area
 Supported on tram wheel and can move on gantry rails
 These are widely used in erection
 Consist of two main part bridge and crab
 Crab consist of hoisting gear mounted on a frame
 Frame mounted on another set of wheels and capablw of
moving across the main girder

29. Traveller (or goliath) cranes
 Crabs moving on girders supported on legs
 Legs moves on tracks laid on floor
 Useful as docksite crane

30. Tower crane
 Mounted on steel tower
 Used in various construction projects
 Its constructed for work and then dismantled
 Truss structure
 Ladders are provided inside the whole height
 Operation cabin is provided
 Saddle moves horizontally and controlled from the hook
block