block 18 placement 13
TRANSCRIPT
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Construction Placement 1
Placement of HMA Mixes
Senior/GraduateHMA Course
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Construction Placement 2
Safety - First, Last and Always...
Don’t depend on drivers to avoid you. Play it safe.
Watch your back and your buddies.
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Construction Placement 3
Push Rollers
Tractor
Hopper
Tow Point
Side ArmsConveyors
Screed
Depth Crank
Augers
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Construction Placement 4
TRACTORTRACTOR
HOPPERHOPPER
PUSH ROLLERPUSH ROLLER
TOW POINTTOW POINT
SIDE ARMSIDE ARM
SCREEDSCREED
DEPTH CRANKDEPTH CRANK
AUGERAUGER
CONVEYORCONVEYOR
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Construction Placement 5
Tractor Unit
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Construction Placement 6
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Construction Placement 7
Push Roller
Truck Hitch
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Construction Placement 8
Truck hitch engaged
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Construction Placement 9
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Construction Placement 10
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Construction Placement 11
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Construction Placement 12
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Construction Placement 13
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Construction Placement 14
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Construction Placement 15
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Construction Placement 16
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Construction Placement 17
Hopper Wings
Slat ConveyorsHopper GatesAugers
Screed Plate
ProportionalFeed Control
Material Flow
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Construction Placement 18
Operational Principles of the Operational Principles of the ScreedScreed
• Self-leveling Concepts Self-leveling Concepts • Screed Response versus Distance Screed Response versus Distance • Forces Acting on a ScreedForces Acting on a Screed
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Construction Placement 19
Self Leveling - Rubber Tired Paver
Rear Drive Tires Front Bogie Wheels
Line of Pull
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Construction Placement 20
Detail of Screed PathDetail of Screed Path
Tow Point PathTow Point PathStep Amplitude = 100%Step Amplitude = 100%
L = Leveling Arm LengthL = Leveling Arm Length
Screed PathScreed PathDirection of PavingDirection of Paving
63%63% 87%87%
6L6L5L5L4L4L3L3L2L2L1L1L00
96%96% 98%98% 99%99%
L
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Construction Placement 21
1 inch movement at Tow Point
1/8 inch movement at Leading Edge of Screed
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Construction Placement 22
Main Forces Acting on Screed Main Forces Acting on Screed
1. Speed of Paver1. Speed of Paver
2. Head of Material2. Head of Material
- - Shear resistanceShear resistance
3. Angle of Attack 3. Angle of Attack
4. Other Forces 4. Other Forces – Pre-compaction Pre-compaction – Screed WeightScreed Weight
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Construction Placement 23
Tow Point
Screed DepthCrank
Pivot Point
F1
F2
F3
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Construction Placement 24
Constant Head of Material Volume
Head of Material Volume Too High
Head of Material Volume Too Low
Correct Depth ofMat Maintained
Screed Rises Due toExcess Material ForcedUnder Nose of Screed
Screed Settles Due toInadequate Supporting
Material
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Construction Placement 25
Correct Correct ElevationElevation
Auger Auger OverloadedOverloaded
Auger Auger UnderloadeUnderloade
dd
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Construction Placement 26
Travel
Angle of Attack
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Construction Placement 27
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Construction Placement 28
HOT STOP ConceptHOT STOP Concept
• If constant material flow cannot be If constant material flow cannot be maintained, before HMA mix drops in maintained, before HMA mix drops in hopper below gates...hopper below gates...
• ““Hot Stop” the paver as quickly as Hot Stop” the paver as quickly as possiblepossible
• Wait for next truckWait for next truck• Pick up truck on run and resume speed as Pick up truck on run and resume speed as
quickly as possible.quickly as possible.
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Construction Placement 29
Screed Control SystemsScreed Control Systems
• Who’s Responsible for Changes Who’s Responsible for Changes • Sticking the Mat Sticking the Mat • Manual Controls Manual Controls • Automatic Controls Automatic Controls
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Construction Placement 30
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Construction Placement 31
Pavement ProfilePavement Profile
Direction of PavingDirection of Paving
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Construction Placement 32
Detail of Screed PathDetail of Screed Path
Tow Point PathTow Point PathStep Amplitude = 100%Step Amplitude = 100%
L = Leveling Arm LengthL = Leveling Arm Length
Screed PathScreed PathDirection of PavingDirection of Paving
63%63% 87%87%
6L6L5L5L4L4L3L3L2L2L1L1L00
96%96% 98%98% 99%99%
L
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Construction Placement 33
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Construction Placement 34
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Construction Placement 35
Types of Grade Reference Types of Grade Reference
• Stringline Stringline • Mobile referenceMobile reference• Joint matching shoe Joint matching shoe • Sonic sensorSonic sensor• LaserLaser
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Construction Placement 36
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Construction Placement 37
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Construction Placement 38
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Construction Placement 39
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Construction Placement 40
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Construction Placement 41
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Construction Placement 42
Grade Sensor - Side Arm Mount
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Construction Placement 43
Grade Sensor - Screed End Mount
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Construction Placement 44
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Construction Placement 45
Ultrasonic Grade SensorUltrasonic Grade Sensor
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Construction Placement 46
Balancing ProductionBalancing Production
TruckingTrucking CompactionCompaction
PavingPavingHMA HMA FacilityFacility
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Construction Placement 47
QUESTIONS ?